SemaDeclCXX.cpp revision d5c95ab821ceb80361bcca24d60b589d79cdec95
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/Sema.h" 15#include "clang/Sema/Initialization.h" 16#include "clang/Sema/Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/CharUnits.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/RecordLayout.h" 23#include "clang/AST/StmtVisitor.h" 24#include "clang/AST/TypeLoc.h" 25#include "clang/AST/TypeOrdering.h" 26#include "clang/Parse/DeclSpec.h" 27#include "clang/Parse/Template.h" 28#include "clang/Basic/PartialDiagnostic.h" 29#include "clang/Lex/Preprocessor.h" 30#include "llvm/ADT/STLExtras.h" 31#include <map> 32#include <set> 33 34using namespace clang; 35 36//===----------------------------------------------------------------------===// 37// CheckDefaultArgumentVisitor 38//===----------------------------------------------------------------------===// 39 40namespace { 41 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 42 /// the default argument of a parameter to determine whether it 43 /// contains any ill-formed subexpressions. For example, this will 44 /// diagnose the use of local variables or parameters within the 45 /// default argument expression. 46 class CheckDefaultArgumentVisitor 47 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 48 Expr *DefaultArg; 49 Sema *S; 50 51 public: 52 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 53 : DefaultArg(defarg), S(s) {} 54 55 bool VisitExpr(Expr *Node); 56 bool VisitDeclRefExpr(DeclRefExpr *DRE); 57 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 58 }; 59 60 /// VisitExpr - Visit all of the children of this expression. 61 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 62 bool IsInvalid = false; 63 for (Stmt::child_iterator I = Node->child_begin(), 64 E = Node->child_end(); I != E; ++I) 65 IsInvalid |= Visit(*I); 66 return IsInvalid; 67 } 68 69 /// VisitDeclRefExpr - Visit a reference to a declaration, to 70 /// determine whether this declaration can be used in the default 71 /// argument expression. 72 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 73 NamedDecl *Decl = DRE->getDecl(); 74 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 75 // C++ [dcl.fct.default]p9 76 // Default arguments are evaluated each time the function is 77 // called. The order of evaluation of function arguments is 78 // unspecified. Consequently, parameters of a function shall not 79 // be used in default argument expressions, even if they are not 80 // evaluated. Parameters of a function declared before a default 81 // argument expression are in scope and can hide namespace and 82 // class member names. 83 return S->Diag(DRE->getSourceRange().getBegin(), 84 diag::err_param_default_argument_references_param) 85 << Param->getDeclName() << DefaultArg->getSourceRange(); 86 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 87 // C++ [dcl.fct.default]p7 88 // Local variables shall not be used in default argument 89 // expressions. 90 if (VDecl->isBlockVarDecl()) 91 return S->Diag(DRE->getSourceRange().getBegin(), 92 diag::err_param_default_argument_references_local) 93 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 94 } 95 96 return false; 97 } 98 99 /// VisitCXXThisExpr - Visit a C++ "this" expression. 100 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 101 // C++ [dcl.fct.default]p8: 102 // The keyword this shall not be used in a default argument of a 103 // member function. 104 return S->Diag(ThisE->getSourceRange().getBegin(), 105 diag::err_param_default_argument_references_this) 106 << ThisE->getSourceRange(); 107 } 108} 109 110bool 111Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 112 SourceLocation EqualLoc) { 113 if (RequireCompleteType(Param->getLocation(), Param->getType(), 114 diag::err_typecheck_decl_incomplete_type)) { 115 Param->setInvalidDecl(); 116 return true; 117 } 118 119 Expr *Arg = (Expr *)DefaultArg.get(); 120 121 // C++ [dcl.fct.default]p5 122 // A default argument expression is implicitly converted (clause 123 // 4) to the parameter type. The default argument expression has 124 // the same semantic constraints as the initializer expression in 125 // a declaration of a variable of the parameter type, using the 126 // copy-initialization semantics (8.5). 127 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 128 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 129 EqualLoc); 130 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 131 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 132 MultiExprArg(*this, (void**)&Arg, 1)); 133 if (Result.isInvalid()) 134 return true; 135 Arg = Result.takeAs<Expr>(); 136 137 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 138 139 // Okay: add the default argument to the parameter 140 Param->setDefaultArg(Arg); 141 142 DefaultArg.release(); 143 144 return false; 145} 146 147/// ActOnParamDefaultArgument - Check whether the default argument 148/// provided for a function parameter is well-formed. If so, attach it 149/// to the parameter declaration. 150void 151Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 152 ExprArg defarg) { 153 if (!param || !defarg.get()) 154 return; 155 156 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 157 UnparsedDefaultArgLocs.erase(Param); 158 159 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 160 161 // Default arguments are only permitted in C++ 162 if (!getLangOptions().CPlusPlus) { 163 Diag(EqualLoc, diag::err_param_default_argument) 164 << DefaultArg->getSourceRange(); 165 Param->setInvalidDecl(); 166 return; 167 } 168 169 // Check that the default argument is well-formed 170 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 171 if (DefaultArgChecker.Visit(DefaultArg.get())) { 172 Param->setInvalidDecl(); 173 return; 174 } 175 176 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 177} 178 179/// ActOnParamUnparsedDefaultArgument - We've seen a default 180/// argument for a function parameter, but we can't parse it yet 181/// because we're inside a class definition. Note that this default 182/// argument will be parsed later. 183void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 184 SourceLocation EqualLoc, 185 SourceLocation ArgLoc) { 186 if (!param) 187 return; 188 189 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 190 if (Param) 191 Param->setUnparsedDefaultArg(); 192 193 UnparsedDefaultArgLocs[Param] = ArgLoc; 194} 195 196/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 197/// the default argument for the parameter param failed. 198void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 199 if (!param) 200 return; 201 202 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 203 204 Param->setInvalidDecl(); 205 206 UnparsedDefaultArgLocs.erase(Param); 207} 208 209/// CheckExtraCXXDefaultArguments - Check for any extra default 210/// arguments in the declarator, which is not a function declaration 211/// or definition and therefore is not permitted to have default 212/// arguments. This routine should be invoked for every declarator 213/// that is not a function declaration or definition. 214void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 215 // C++ [dcl.fct.default]p3 216 // A default argument expression shall be specified only in the 217 // parameter-declaration-clause of a function declaration or in a 218 // template-parameter (14.1). It shall not be specified for a 219 // parameter pack. If it is specified in a 220 // parameter-declaration-clause, it shall not occur within a 221 // declarator or abstract-declarator of a parameter-declaration. 222 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 223 DeclaratorChunk &chunk = D.getTypeObject(i); 224 if (chunk.Kind == DeclaratorChunk::Function) { 225 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 226 ParmVarDecl *Param = 227 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 228 if (Param->hasUnparsedDefaultArg()) { 229 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 230 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 231 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 232 delete Toks; 233 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 234 } else if (Param->getDefaultArg()) { 235 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 236 << Param->getDefaultArg()->getSourceRange(); 237 Param->setDefaultArg(0); 238 } 239 } 240 } 241 } 242} 243 244// MergeCXXFunctionDecl - Merge two declarations of the same C++ 245// function, once we already know that they have the same 246// type. Subroutine of MergeFunctionDecl. Returns true if there was an 247// error, false otherwise. 248bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 249 bool Invalid = false; 250 251 // C++ [dcl.fct.default]p4: 252 // For non-template functions, default arguments can be added in 253 // later declarations of a function in the same 254 // scope. Declarations in different scopes have completely 255 // distinct sets of default arguments. That is, declarations in 256 // inner scopes do not acquire default arguments from 257 // declarations in outer scopes, and vice versa. In a given 258 // function declaration, all parameters subsequent to a 259 // parameter with a default argument shall have default 260 // arguments supplied in this or previous declarations. A 261 // default argument shall not be redefined by a later 262 // declaration (not even to the same value). 263 // 264 // C++ [dcl.fct.default]p6: 265 // Except for member functions of class templates, the default arguments 266 // in a member function definition that appears outside of the class 267 // definition are added to the set of default arguments provided by the 268 // member function declaration in the class definition. 269 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 270 ParmVarDecl *OldParam = Old->getParamDecl(p); 271 ParmVarDecl *NewParam = New->getParamDecl(p); 272 273 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 274 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 275 // hint here. Alternatively, we could walk the type-source information 276 // for NewParam to find the last source location in the type... but it 277 // isn't worth the effort right now. This is the kind of test case that 278 // is hard to get right: 279 280 // int f(int); 281 // void g(int (*fp)(int) = f); 282 // void g(int (*fp)(int) = &f); 283 Diag(NewParam->getLocation(), 284 diag::err_param_default_argument_redefinition) 285 << NewParam->getDefaultArgRange(); 286 287 // Look for the function declaration where the default argument was 288 // actually written, which may be a declaration prior to Old. 289 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 290 Older; Older = Older->getPreviousDeclaration()) { 291 if (!Older->getParamDecl(p)->hasDefaultArg()) 292 break; 293 294 OldParam = Older->getParamDecl(p); 295 } 296 297 Diag(OldParam->getLocation(), diag::note_previous_definition) 298 << OldParam->getDefaultArgRange(); 299 Invalid = true; 300 } else if (OldParam->hasDefaultArg()) { 301 // Merge the old default argument into the new parameter. 302 // It's important to use getInit() here; getDefaultArg() 303 // strips off any top-level CXXExprWithTemporaries. 304 NewParam->setHasInheritedDefaultArg(); 305 if (OldParam->hasUninstantiatedDefaultArg()) 306 NewParam->setUninstantiatedDefaultArg( 307 OldParam->getUninstantiatedDefaultArg()); 308 else 309 NewParam->setDefaultArg(OldParam->getInit()); 310 } else if (NewParam->hasDefaultArg()) { 311 if (New->getDescribedFunctionTemplate()) { 312 // Paragraph 4, quoted above, only applies to non-template functions. 313 Diag(NewParam->getLocation(), 314 diag::err_param_default_argument_template_redecl) 315 << NewParam->getDefaultArgRange(); 316 Diag(Old->getLocation(), diag::note_template_prev_declaration) 317 << false; 318 } else if (New->getTemplateSpecializationKind() 319 != TSK_ImplicitInstantiation && 320 New->getTemplateSpecializationKind() != TSK_Undeclared) { 321 // C++ [temp.expr.spec]p21: 322 // Default function arguments shall not be specified in a declaration 323 // or a definition for one of the following explicit specializations: 324 // - the explicit specialization of a function template; 325 // - the explicit specialization of a member function template; 326 // - the explicit specialization of a member function of a class 327 // template where the class template specialization to which the 328 // member function specialization belongs is implicitly 329 // instantiated. 330 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 331 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 332 << New->getDeclName() 333 << NewParam->getDefaultArgRange(); 334 } else if (New->getDeclContext()->isDependentContext()) { 335 // C++ [dcl.fct.default]p6 (DR217): 336 // Default arguments for a member function of a class template shall 337 // be specified on the initial declaration of the member function 338 // within the class template. 339 // 340 // Reading the tea leaves a bit in DR217 and its reference to DR205 341 // leads me to the conclusion that one cannot add default function 342 // arguments for an out-of-line definition of a member function of a 343 // dependent type. 344 int WhichKind = 2; 345 if (CXXRecordDecl *Record 346 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 347 if (Record->getDescribedClassTemplate()) 348 WhichKind = 0; 349 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 350 WhichKind = 1; 351 else 352 WhichKind = 2; 353 } 354 355 Diag(NewParam->getLocation(), 356 diag::err_param_default_argument_member_template_redecl) 357 << WhichKind 358 << NewParam->getDefaultArgRange(); 359 } 360 } 361 } 362 363 if (CheckEquivalentExceptionSpec(Old, New)) 364 Invalid = true; 365 366 return Invalid; 367} 368 369/// CheckCXXDefaultArguments - Verify that the default arguments for a 370/// function declaration are well-formed according to C++ 371/// [dcl.fct.default]. 372void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 373 unsigned NumParams = FD->getNumParams(); 374 unsigned p; 375 376 // Find first parameter with a default argument 377 for (p = 0; p < NumParams; ++p) { 378 ParmVarDecl *Param = FD->getParamDecl(p); 379 if (Param->hasDefaultArg()) 380 break; 381 } 382 383 // C++ [dcl.fct.default]p4: 384 // In a given function declaration, all parameters 385 // subsequent to a parameter with a default argument shall 386 // have default arguments supplied in this or previous 387 // declarations. A default argument shall not be redefined 388 // by a later declaration (not even to the same value). 389 unsigned LastMissingDefaultArg = 0; 390 for (; p < NumParams; ++p) { 391 ParmVarDecl *Param = FD->getParamDecl(p); 392 if (!Param->hasDefaultArg()) { 393 if (Param->isInvalidDecl()) 394 /* We already complained about this parameter. */; 395 else if (Param->getIdentifier()) 396 Diag(Param->getLocation(), 397 diag::err_param_default_argument_missing_name) 398 << Param->getIdentifier(); 399 else 400 Diag(Param->getLocation(), 401 diag::err_param_default_argument_missing); 402 403 LastMissingDefaultArg = p; 404 } 405 } 406 407 if (LastMissingDefaultArg > 0) { 408 // Some default arguments were missing. Clear out all of the 409 // default arguments up to (and including) the last missing 410 // default argument, so that we leave the function parameters 411 // in a semantically valid state. 412 for (p = 0; p <= LastMissingDefaultArg; ++p) { 413 ParmVarDecl *Param = FD->getParamDecl(p); 414 if (Param->hasDefaultArg()) { 415 Param->setDefaultArg(0); 416 } 417 } 418 } 419} 420 421/// isCurrentClassName - Determine whether the identifier II is the 422/// name of the class type currently being defined. In the case of 423/// nested classes, this will only return true if II is the name of 424/// the innermost class. 425bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 426 const CXXScopeSpec *SS) { 427 assert(getLangOptions().CPlusPlus && "No class names in C!"); 428 429 CXXRecordDecl *CurDecl; 430 if (SS && SS->isSet() && !SS->isInvalid()) { 431 DeclContext *DC = computeDeclContext(*SS, true); 432 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 433 } else 434 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 435 436 if (CurDecl && CurDecl->getIdentifier()) 437 return &II == CurDecl->getIdentifier(); 438 else 439 return false; 440} 441 442/// \brief Check the validity of a C++ base class specifier. 443/// 444/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 445/// and returns NULL otherwise. 446CXXBaseSpecifier * 447Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 448 SourceRange SpecifierRange, 449 bool Virtual, AccessSpecifier Access, 450 TypeSourceInfo *TInfo) { 451 QualType BaseType = TInfo->getType(); 452 453 // C++ [class.union]p1: 454 // A union shall not have base classes. 455 if (Class->isUnion()) { 456 Diag(Class->getLocation(), diag::err_base_clause_on_union) 457 << SpecifierRange; 458 return 0; 459 } 460 461 if (BaseType->isDependentType()) 462 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 463 Class->getTagKind() == TTK_Class, 464 Access, TInfo); 465 466 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 467 468 // Base specifiers must be record types. 469 if (!BaseType->isRecordType()) { 470 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 471 return 0; 472 } 473 474 // C++ [class.union]p1: 475 // A union shall not be used as a base class. 476 if (BaseType->isUnionType()) { 477 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 478 return 0; 479 } 480 481 // C++ [class.derived]p2: 482 // The class-name in a base-specifier shall not be an incompletely 483 // defined class. 484 if (RequireCompleteType(BaseLoc, BaseType, 485 PDiag(diag::err_incomplete_base_class) 486 << SpecifierRange)) { 487 Class->setInvalidDecl(); 488 return 0; 489 } 490 491 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 492 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 493 assert(BaseDecl && "Record type has no declaration"); 494 BaseDecl = BaseDecl->getDefinition(); 495 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 496 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 497 assert(CXXBaseDecl && "Base type is not a C++ type"); 498 499 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 500 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 501 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 502 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 503 << BaseType; 504 return 0; 505 } 506 507 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 508 509 if (BaseDecl->isInvalidDecl()) 510 Class->setInvalidDecl(); 511 512 // Create the base specifier. 513 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 514 Class->getTagKind() == TTK_Class, 515 Access, TInfo); 516} 517 518void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 519 const CXXRecordDecl *BaseClass, 520 bool BaseIsVirtual) { 521 // A class with a non-empty base class is not empty. 522 // FIXME: Standard ref? 523 if (!BaseClass->isEmpty()) 524 Class->setEmpty(false); 525 526 // C++ [class.virtual]p1: 527 // A class that [...] inherits a virtual function is called a polymorphic 528 // class. 529 if (BaseClass->isPolymorphic()) 530 Class->setPolymorphic(true); 531 532 // C++ [dcl.init.aggr]p1: 533 // An aggregate is [...] a class with [...] no base classes [...]. 534 Class->setAggregate(false); 535 536 // C++ [class]p4: 537 // A POD-struct is an aggregate class... 538 Class->setPOD(false); 539 540 if (BaseIsVirtual) { 541 // C++ [class.ctor]p5: 542 // A constructor is trivial if its class has no virtual base classes. 543 Class->setHasTrivialConstructor(false); 544 545 // C++ [class.copy]p6: 546 // A copy constructor is trivial if its class has no virtual base classes. 547 Class->setHasTrivialCopyConstructor(false); 548 549 // C++ [class.copy]p11: 550 // A copy assignment operator is trivial if its class has no virtual 551 // base classes. 552 Class->setHasTrivialCopyAssignment(false); 553 554 // C++0x [meta.unary.prop] is_empty: 555 // T is a class type, but not a union type, with ... no virtual base 556 // classes 557 Class->setEmpty(false); 558 } else { 559 // C++ [class.ctor]p5: 560 // A constructor is trivial if all the direct base classes of its 561 // class have trivial constructors. 562 if (!BaseClass->hasTrivialConstructor()) 563 Class->setHasTrivialConstructor(false); 564 565 // C++ [class.copy]p6: 566 // A copy constructor is trivial if all the direct base classes of its 567 // class have trivial copy constructors. 568 if (!BaseClass->hasTrivialCopyConstructor()) 569 Class->setHasTrivialCopyConstructor(false); 570 571 // C++ [class.copy]p11: 572 // A copy assignment operator is trivial if all the direct base classes 573 // of its class have trivial copy assignment operators. 574 if (!BaseClass->hasTrivialCopyAssignment()) 575 Class->setHasTrivialCopyAssignment(false); 576 } 577 578 // C++ [class.ctor]p3: 579 // A destructor is trivial if all the direct base classes of its class 580 // have trivial destructors. 581 if (!BaseClass->hasTrivialDestructor()) 582 Class->setHasTrivialDestructor(false); 583} 584 585/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 586/// one entry in the base class list of a class specifier, for 587/// example: 588/// class foo : public bar, virtual private baz { 589/// 'public bar' and 'virtual private baz' are each base-specifiers. 590Sema::BaseResult 591Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 592 bool Virtual, AccessSpecifier Access, 593 TypeTy *basetype, SourceLocation BaseLoc) { 594 if (!classdecl) 595 return true; 596 597 AdjustDeclIfTemplate(classdecl); 598 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 599 if (!Class) 600 return true; 601 602 TypeSourceInfo *TInfo = 0; 603 GetTypeFromParser(basetype, &TInfo); 604 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 605 Virtual, Access, TInfo)) 606 return BaseSpec; 607 608 return true; 609} 610 611/// \brief Performs the actual work of attaching the given base class 612/// specifiers to a C++ class. 613bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 614 unsigned NumBases) { 615 if (NumBases == 0) 616 return false; 617 618 // Used to keep track of which base types we have already seen, so 619 // that we can properly diagnose redundant direct base types. Note 620 // that the key is always the unqualified canonical type of the base 621 // class. 622 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 623 624 // Copy non-redundant base specifiers into permanent storage. 625 unsigned NumGoodBases = 0; 626 bool Invalid = false; 627 for (unsigned idx = 0; idx < NumBases; ++idx) { 628 QualType NewBaseType 629 = Context.getCanonicalType(Bases[idx]->getType()); 630 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 631 if (!Class->hasObjectMember()) { 632 if (const RecordType *FDTTy = 633 NewBaseType.getTypePtr()->getAs<RecordType>()) 634 if (FDTTy->getDecl()->hasObjectMember()) 635 Class->setHasObjectMember(true); 636 } 637 638 if (KnownBaseTypes[NewBaseType]) { 639 // C++ [class.mi]p3: 640 // A class shall not be specified as a direct base class of a 641 // derived class more than once. 642 Diag(Bases[idx]->getSourceRange().getBegin(), 643 diag::err_duplicate_base_class) 644 << KnownBaseTypes[NewBaseType]->getType() 645 << Bases[idx]->getSourceRange(); 646 647 // Delete the duplicate base class specifier; we're going to 648 // overwrite its pointer later. 649 Context.Deallocate(Bases[idx]); 650 651 Invalid = true; 652 } else { 653 // Okay, add this new base class. 654 KnownBaseTypes[NewBaseType] = Bases[idx]; 655 Bases[NumGoodBases++] = Bases[idx]; 656 } 657 } 658 659 // Attach the remaining base class specifiers to the derived class. 660 Class->setBases(Bases, NumGoodBases); 661 662 // Delete the remaining (good) base class specifiers, since their 663 // data has been copied into the CXXRecordDecl. 664 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 665 Context.Deallocate(Bases[idx]); 666 667 return Invalid; 668} 669 670/// ActOnBaseSpecifiers - Attach the given base specifiers to the 671/// class, after checking whether there are any duplicate base 672/// classes. 673void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 674 unsigned NumBases) { 675 if (!ClassDecl || !Bases || !NumBases) 676 return; 677 678 AdjustDeclIfTemplate(ClassDecl); 679 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 680 (CXXBaseSpecifier**)(Bases), NumBases); 681} 682 683static CXXRecordDecl *GetClassForType(QualType T) { 684 if (const RecordType *RT = T->getAs<RecordType>()) 685 return cast<CXXRecordDecl>(RT->getDecl()); 686 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 687 return ICT->getDecl(); 688 else 689 return 0; 690} 691 692/// \brief Determine whether the type \p Derived is a C++ class that is 693/// derived from the type \p Base. 694bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 695 if (!getLangOptions().CPlusPlus) 696 return false; 697 698 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 699 if (!DerivedRD) 700 return false; 701 702 CXXRecordDecl *BaseRD = GetClassForType(Base); 703 if (!BaseRD) 704 return false; 705 706 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 707 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 708} 709 710/// \brief Determine whether the type \p Derived is a C++ class that is 711/// derived from the type \p Base. 712bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 713 if (!getLangOptions().CPlusPlus) 714 return false; 715 716 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 717 if (!DerivedRD) 718 return false; 719 720 CXXRecordDecl *BaseRD = GetClassForType(Base); 721 if (!BaseRD) 722 return false; 723 724 return DerivedRD->isDerivedFrom(BaseRD, Paths); 725} 726 727void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 728 CXXCastPath &BasePathArray) { 729 assert(BasePathArray.empty() && "Base path array must be empty!"); 730 assert(Paths.isRecordingPaths() && "Must record paths!"); 731 732 const CXXBasePath &Path = Paths.front(); 733 734 // We first go backward and check if we have a virtual base. 735 // FIXME: It would be better if CXXBasePath had the base specifier for 736 // the nearest virtual base. 737 unsigned Start = 0; 738 for (unsigned I = Path.size(); I != 0; --I) { 739 if (Path[I - 1].Base->isVirtual()) { 740 Start = I - 1; 741 break; 742 } 743 } 744 745 // Now add all bases. 746 for (unsigned I = Start, E = Path.size(); I != E; ++I) 747 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 748} 749 750/// \brief Determine whether the given base path includes a virtual 751/// base class. 752bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 753 for (CXXCastPath::const_iterator B = BasePath.begin(), 754 BEnd = BasePath.end(); 755 B != BEnd; ++B) 756 if ((*B)->isVirtual()) 757 return true; 758 759 return false; 760} 761 762/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 763/// conversion (where Derived and Base are class types) is 764/// well-formed, meaning that the conversion is unambiguous (and 765/// that all of the base classes are accessible). Returns true 766/// and emits a diagnostic if the code is ill-formed, returns false 767/// otherwise. Loc is the location where this routine should point to 768/// if there is an error, and Range is the source range to highlight 769/// if there is an error. 770bool 771Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 772 unsigned InaccessibleBaseID, 773 unsigned AmbigiousBaseConvID, 774 SourceLocation Loc, SourceRange Range, 775 DeclarationName Name, 776 CXXCastPath *BasePath) { 777 // First, determine whether the path from Derived to Base is 778 // ambiguous. This is slightly more expensive than checking whether 779 // the Derived to Base conversion exists, because here we need to 780 // explore multiple paths to determine if there is an ambiguity. 781 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 782 /*DetectVirtual=*/false); 783 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 784 assert(DerivationOkay && 785 "Can only be used with a derived-to-base conversion"); 786 (void)DerivationOkay; 787 788 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 789 if (InaccessibleBaseID) { 790 // Check that the base class can be accessed. 791 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 792 InaccessibleBaseID)) { 793 case AR_inaccessible: 794 return true; 795 case AR_accessible: 796 case AR_dependent: 797 case AR_delayed: 798 break; 799 } 800 } 801 802 // Build a base path if necessary. 803 if (BasePath) 804 BuildBasePathArray(Paths, *BasePath); 805 return false; 806 } 807 808 // We know that the derived-to-base conversion is ambiguous, and 809 // we're going to produce a diagnostic. Perform the derived-to-base 810 // search just one more time to compute all of the possible paths so 811 // that we can print them out. This is more expensive than any of 812 // the previous derived-to-base checks we've done, but at this point 813 // performance isn't as much of an issue. 814 Paths.clear(); 815 Paths.setRecordingPaths(true); 816 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 817 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 818 (void)StillOkay; 819 820 // Build up a textual representation of the ambiguous paths, e.g., 821 // D -> B -> A, that will be used to illustrate the ambiguous 822 // conversions in the diagnostic. We only print one of the paths 823 // to each base class subobject. 824 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 825 826 Diag(Loc, AmbigiousBaseConvID) 827 << Derived << Base << PathDisplayStr << Range << Name; 828 return true; 829} 830 831bool 832Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 833 SourceLocation Loc, SourceRange Range, 834 CXXCastPath *BasePath, 835 bool IgnoreAccess) { 836 return CheckDerivedToBaseConversion(Derived, Base, 837 IgnoreAccess ? 0 838 : diag::err_upcast_to_inaccessible_base, 839 diag::err_ambiguous_derived_to_base_conv, 840 Loc, Range, DeclarationName(), 841 BasePath); 842} 843 844 845/// @brief Builds a string representing ambiguous paths from a 846/// specific derived class to different subobjects of the same base 847/// class. 848/// 849/// This function builds a string that can be used in error messages 850/// to show the different paths that one can take through the 851/// inheritance hierarchy to go from the derived class to different 852/// subobjects of a base class. The result looks something like this: 853/// @code 854/// struct D -> struct B -> struct A 855/// struct D -> struct C -> struct A 856/// @endcode 857std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 858 std::string PathDisplayStr; 859 std::set<unsigned> DisplayedPaths; 860 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 861 Path != Paths.end(); ++Path) { 862 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 863 // We haven't displayed a path to this particular base 864 // class subobject yet. 865 PathDisplayStr += "\n "; 866 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 867 for (CXXBasePath::const_iterator Element = Path->begin(); 868 Element != Path->end(); ++Element) 869 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 870 } 871 } 872 873 return PathDisplayStr; 874} 875 876//===----------------------------------------------------------------------===// 877// C++ class member Handling 878//===----------------------------------------------------------------------===// 879 880/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 881Sema::DeclPtrTy 882Sema::ActOnAccessSpecifier(AccessSpecifier Access, 883 SourceLocation ASLoc, SourceLocation ColonLoc) { 884 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 885 AccessSpecDecl* ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 886 ASLoc, ColonLoc); 887 CurContext->addHiddenDecl(ASDecl); 888 return DeclPtrTy::make(ASDecl); 889} 890 891/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 892/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 893/// bitfield width if there is one and 'InitExpr' specifies the initializer if 894/// any. 895Sema::DeclPtrTy 896Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 897 MultiTemplateParamsArg TemplateParameterLists, 898 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 899 bool Deleted) { 900 const DeclSpec &DS = D.getDeclSpec(); 901 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 902 DeclarationName Name = NameInfo.getName(); 903 SourceLocation Loc = NameInfo.getLoc(); 904 Expr *BitWidth = static_cast<Expr*>(BW); 905 Expr *Init = static_cast<Expr*>(InitExpr); 906 907 assert(isa<CXXRecordDecl>(CurContext)); 908 assert(!DS.isFriendSpecified()); 909 910 bool isFunc = false; 911 if (D.isFunctionDeclarator()) 912 isFunc = true; 913 else if (D.getNumTypeObjects() == 0 && 914 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 915 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 916 isFunc = TDType->isFunctionType(); 917 } 918 919 // C++ 9.2p6: A member shall not be declared to have automatic storage 920 // duration (auto, register) or with the extern storage-class-specifier. 921 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 922 // data members and cannot be applied to names declared const or static, 923 // and cannot be applied to reference members. 924 switch (DS.getStorageClassSpec()) { 925 case DeclSpec::SCS_unspecified: 926 case DeclSpec::SCS_typedef: 927 case DeclSpec::SCS_static: 928 // FALL THROUGH. 929 break; 930 case DeclSpec::SCS_mutable: 931 if (isFunc) { 932 if (DS.getStorageClassSpecLoc().isValid()) 933 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 934 else 935 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 936 937 // FIXME: It would be nicer if the keyword was ignored only for this 938 // declarator. Otherwise we could get follow-up errors. 939 D.getMutableDeclSpec().ClearStorageClassSpecs(); 940 } 941 break; 942 default: 943 if (DS.getStorageClassSpecLoc().isValid()) 944 Diag(DS.getStorageClassSpecLoc(), 945 diag::err_storageclass_invalid_for_member); 946 else 947 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 948 D.getMutableDeclSpec().ClearStorageClassSpecs(); 949 } 950 951 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 952 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 953 !isFunc); 954 955 Decl *Member; 956 if (isInstField) { 957 // FIXME: Check for template parameters! 958 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 959 AS); 960 assert(Member && "HandleField never returns null"); 961 } else { 962 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 963 .getAs<Decl>(); 964 if (!Member) { 965 if (BitWidth) DeleteExpr(BitWidth); 966 return DeclPtrTy(); 967 } 968 969 // Non-instance-fields can't have a bitfield. 970 if (BitWidth) { 971 if (Member->isInvalidDecl()) { 972 // don't emit another diagnostic. 973 } else if (isa<VarDecl>(Member)) { 974 // C++ 9.6p3: A bit-field shall not be a static member. 975 // "static member 'A' cannot be a bit-field" 976 Diag(Loc, diag::err_static_not_bitfield) 977 << Name << BitWidth->getSourceRange(); 978 } else if (isa<TypedefDecl>(Member)) { 979 // "typedef member 'x' cannot be a bit-field" 980 Diag(Loc, diag::err_typedef_not_bitfield) 981 << Name << BitWidth->getSourceRange(); 982 } else { 983 // A function typedef ("typedef int f(); f a;"). 984 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 985 Diag(Loc, diag::err_not_integral_type_bitfield) 986 << Name << cast<ValueDecl>(Member)->getType() 987 << BitWidth->getSourceRange(); 988 } 989 990 DeleteExpr(BitWidth); 991 BitWidth = 0; 992 Member->setInvalidDecl(); 993 } 994 995 Member->setAccess(AS); 996 997 // If we have declared a member function template, set the access of the 998 // templated declaration as well. 999 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1000 FunTmpl->getTemplatedDecl()->setAccess(AS); 1001 } 1002 1003 assert((Name || isInstField) && "No identifier for non-field ?"); 1004 1005 if (Init) 1006 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 1007 if (Deleted) // FIXME: Source location is not very good. 1008 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 1009 1010 if (isInstField) { 1011 FieldCollector->Add(cast<FieldDecl>(Member)); 1012 return DeclPtrTy(); 1013 } 1014 return DeclPtrTy::make(Member); 1015} 1016 1017/// \brief Find the direct and/or virtual base specifiers that 1018/// correspond to the given base type, for use in base initialization 1019/// within a constructor. 1020static bool FindBaseInitializer(Sema &SemaRef, 1021 CXXRecordDecl *ClassDecl, 1022 QualType BaseType, 1023 const CXXBaseSpecifier *&DirectBaseSpec, 1024 const CXXBaseSpecifier *&VirtualBaseSpec) { 1025 // First, check for a direct base class. 1026 DirectBaseSpec = 0; 1027 for (CXXRecordDecl::base_class_const_iterator Base 1028 = ClassDecl->bases_begin(); 1029 Base != ClassDecl->bases_end(); ++Base) { 1030 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1031 // We found a direct base of this type. That's what we're 1032 // initializing. 1033 DirectBaseSpec = &*Base; 1034 break; 1035 } 1036 } 1037 1038 // Check for a virtual base class. 1039 // FIXME: We might be able to short-circuit this if we know in advance that 1040 // there are no virtual bases. 1041 VirtualBaseSpec = 0; 1042 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1043 // We haven't found a base yet; search the class hierarchy for a 1044 // virtual base class. 1045 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1046 /*DetectVirtual=*/false); 1047 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1048 BaseType, Paths)) { 1049 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1050 Path != Paths.end(); ++Path) { 1051 if (Path->back().Base->isVirtual()) { 1052 VirtualBaseSpec = Path->back().Base; 1053 break; 1054 } 1055 } 1056 } 1057 } 1058 1059 return DirectBaseSpec || VirtualBaseSpec; 1060} 1061 1062/// ActOnMemInitializer - Handle a C++ member initializer. 1063Sema::MemInitResult 1064Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1065 Scope *S, 1066 CXXScopeSpec &SS, 1067 IdentifierInfo *MemberOrBase, 1068 TypeTy *TemplateTypeTy, 1069 SourceLocation IdLoc, 1070 SourceLocation LParenLoc, 1071 ExprTy **Args, unsigned NumArgs, 1072 SourceLocation *CommaLocs, 1073 SourceLocation RParenLoc) { 1074 if (!ConstructorD) 1075 return true; 1076 1077 AdjustDeclIfTemplate(ConstructorD); 1078 1079 CXXConstructorDecl *Constructor 1080 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1081 if (!Constructor) { 1082 // The user wrote a constructor initializer on a function that is 1083 // not a C++ constructor. Ignore the error for now, because we may 1084 // have more member initializers coming; we'll diagnose it just 1085 // once in ActOnMemInitializers. 1086 return true; 1087 } 1088 1089 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1090 1091 // C++ [class.base.init]p2: 1092 // Names in a mem-initializer-id are looked up in the scope of the 1093 // constructor’s class and, if not found in that scope, are looked 1094 // up in the scope containing the constructor’s 1095 // definition. [Note: if the constructor’s class contains a member 1096 // with the same name as a direct or virtual base class of the 1097 // class, a mem-initializer-id naming the member or base class and 1098 // composed of a single identifier refers to the class member. A 1099 // mem-initializer-id for the hidden base class may be specified 1100 // using a qualified name. ] 1101 if (!SS.getScopeRep() && !TemplateTypeTy) { 1102 // Look for a member, first. 1103 FieldDecl *Member = 0; 1104 DeclContext::lookup_result Result 1105 = ClassDecl->lookup(MemberOrBase); 1106 if (Result.first != Result.second) 1107 Member = dyn_cast<FieldDecl>(*Result.first); 1108 1109 // FIXME: Handle members of an anonymous union. 1110 1111 if (Member) 1112 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1113 LParenLoc, RParenLoc); 1114 } 1115 // It didn't name a member, so see if it names a class. 1116 QualType BaseType; 1117 TypeSourceInfo *TInfo = 0; 1118 1119 if (TemplateTypeTy) { 1120 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1121 } else { 1122 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1123 LookupParsedName(R, S, &SS); 1124 1125 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1126 if (!TyD) { 1127 if (R.isAmbiguous()) return true; 1128 1129 // We don't want access-control diagnostics here. 1130 R.suppressDiagnostics(); 1131 1132 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1133 bool NotUnknownSpecialization = false; 1134 DeclContext *DC = computeDeclContext(SS, false); 1135 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1136 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1137 1138 if (!NotUnknownSpecialization) { 1139 // When the scope specifier can refer to a member of an unknown 1140 // specialization, we take it as a type name. 1141 BaseType = CheckTypenameType(ETK_None, 1142 (NestedNameSpecifier *)SS.getScopeRep(), 1143 *MemberOrBase, SourceLocation(), 1144 SS.getRange(), IdLoc); 1145 if (BaseType.isNull()) 1146 return true; 1147 1148 R.clear(); 1149 R.setLookupName(MemberOrBase); 1150 } 1151 } 1152 1153 // If no results were found, try to correct typos. 1154 if (R.empty() && BaseType.isNull() && 1155 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1156 R.isSingleResult()) { 1157 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1158 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1159 // We have found a non-static data member with a similar 1160 // name to what was typed; complain and initialize that 1161 // member. 1162 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1163 << MemberOrBase << true << R.getLookupName() 1164 << FixItHint::CreateReplacement(R.getNameLoc(), 1165 R.getLookupName().getAsString()); 1166 Diag(Member->getLocation(), diag::note_previous_decl) 1167 << Member->getDeclName(); 1168 1169 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1170 LParenLoc, RParenLoc); 1171 } 1172 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1173 const CXXBaseSpecifier *DirectBaseSpec; 1174 const CXXBaseSpecifier *VirtualBaseSpec; 1175 if (FindBaseInitializer(*this, ClassDecl, 1176 Context.getTypeDeclType(Type), 1177 DirectBaseSpec, VirtualBaseSpec)) { 1178 // We have found a direct or virtual base class with a 1179 // similar name to what was typed; complain and initialize 1180 // that base class. 1181 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1182 << MemberOrBase << false << R.getLookupName() 1183 << FixItHint::CreateReplacement(R.getNameLoc(), 1184 R.getLookupName().getAsString()); 1185 1186 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1187 : VirtualBaseSpec; 1188 Diag(BaseSpec->getSourceRange().getBegin(), 1189 diag::note_base_class_specified_here) 1190 << BaseSpec->getType() 1191 << BaseSpec->getSourceRange(); 1192 1193 TyD = Type; 1194 } 1195 } 1196 } 1197 1198 if (!TyD && BaseType.isNull()) { 1199 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1200 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1201 return true; 1202 } 1203 } 1204 1205 if (BaseType.isNull()) { 1206 BaseType = Context.getTypeDeclType(TyD); 1207 if (SS.isSet()) { 1208 NestedNameSpecifier *Qualifier = 1209 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1210 1211 // FIXME: preserve source range information 1212 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1213 } 1214 } 1215 } 1216 1217 if (!TInfo) 1218 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1219 1220 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1221 LParenLoc, RParenLoc, ClassDecl); 1222} 1223 1224/// Checks an initializer expression for use of uninitialized fields, such as 1225/// containing the field that is being initialized. Returns true if there is an 1226/// uninitialized field was used an updates the SourceLocation parameter; false 1227/// otherwise. 1228static bool InitExprContainsUninitializedFields(const Stmt *S, 1229 const FieldDecl *LhsField, 1230 SourceLocation *L) { 1231 if (isa<CallExpr>(S)) { 1232 // Do not descend into function calls or constructors, as the use 1233 // of an uninitialized field may be valid. One would have to inspect 1234 // the contents of the function/ctor to determine if it is safe or not. 1235 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1236 // may be safe, depending on what the function/ctor does. 1237 return false; 1238 } 1239 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1240 const NamedDecl *RhsField = ME->getMemberDecl(); 1241 if (RhsField == LhsField) { 1242 // Initializing a field with itself. Throw a warning. 1243 // But wait; there are exceptions! 1244 // Exception #1: The field may not belong to this record. 1245 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1246 const Expr *base = ME->getBase(); 1247 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1248 // Even though the field matches, it does not belong to this record. 1249 return false; 1250 } 1251 // None of the exceptions triggered; return true to indicate an 1252 // uninitialized field was used. 1253 *L = ME->getMemberLoc(); 1254 return true; 1255 } 1256 } 1257 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1258 it != e; ++it) { 1259 if (!*it) { 1260 // An expression such as 'member(arg ?: "")' may trigger this. 1261 continue; 1262 } 1263 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1264 return true; 1265 } 1266 return false; 1267} 1268 1269Sema::MemInitResult 1270Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1271 unsigned NumArgs, SourceLocation IdLoc, 1272 SourceLocation LParenLoc, 1273 SourceLocation RParenLoc) { 1274 // Diagnose value-uses of fields to initialize themselves, e.g. 1275 // foo(foo) 1276 // where foo is not also a parameter to the constructor. 1277 // TODO: implement -Wuninitialized and fold this into that framework. 1278 for (unsigned i = 0; i < NumArgs; ++i) { 1279 SourceLocation L; 1280 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1281 // FIXME: Return true in the case when other fields are used before being 1282 // uninitialized. For example, let this field be the i'th field. When 1283 // initializing the i'th field, throw a warning if any of the >= i'th 1284 // fields are used, as they are not yet initialized. 1285 // Right now we are only handling the case where the i'th field uses 1286 // itself in its initializer. 1287 Diag(L, diag::warn_field_is_uninit); 1288 } 1289 } 1290 1291 bool HasDependentArg = false; 1292 for (unsigned i = 0; i < NumArgs; i++) 1293 HasDependentArg |= Args[i]->isTypeDependent(); 1294 1295 if (Member->getType()->isDependentType() || HasDependentArg) { 1296 // Can't check initialization for a member of dependent type or when 1297 // any of the arguments are type-dependent expressions. 1298 OwningExprResult Init 1299 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1300 RParenLoc)); 1301 1302 // Erase any temporaries within this evaluation context; we're not 1303 // going to track them in the AST, since we'll be rebuilding the 1304 // ASTs during template instantiation. 1305 ExprTemporaries.erase( 1306 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1307 ExprTemporaries.end()); 1308 1309 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1310 LParenLoc, 1311 Init.takeAs<Expr>(), 1312 RParenLoc); 1313 1314 } 1315 1316 if (Member->isInvalidDecl()) 1317 return true; 1318 1319 // Initialize the member. 1320 InitializedEntity MemberEntity = 1321 InitializedEntity::InitializeMember(Member, 0); 1322 InitializationKind Kind = 1323 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1324 1325 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1326 1327 OwningExprResult MemberInit = 1328 InitSeq.Perform(*this, MemberEntity, Kind, 1329 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1330 if (MemberInit.isInvalid()) 1331 return true; 1332 1333 // C++0x [class.base.init]p7: 1334 // The initialization of each base and member constitutes a 1335 // full-expression. 1336 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1337 if (MemberInit.isInvalid()) 1338 return true; 1339 1340 // If we are in a dependent context, template instantiation will 1341 // perform this type-checking again. Just save the arguments that we 1342 // received in a ParenListExpr. 1343 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1344 // of the information that we have about the member 1345 // initializer. However, deconstructing the ASTs is a dicey process, 1346 // and this approach is far more likely to get the corner cases right. 1347 if (CurContext->isDependentContext()) { 1348 // Bump the reference count of all of the arguments. 1349 for (unsigned I = 0; I != NumArgs; ++I) 1350 Args[I]->Retain(); 1351 1352 OwningExprResult Init 1353 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1354 RParenLoc)); 1355 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1356 LParenLoc, 1357 Init.takeAs<Expr>(), 1358 RParenLoc); 1359 } 1360 1361 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1362 LParenLoc, 1363 MemberInit.takeAs<Expr>(), 1364 RParenLoc); 1365} 1366 1367Sema::MemInitResult 1368Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1369 Expr **Args, unsigned NumArgs, 1370 SourceLocation LParenLoc, SourceLocation RParenLoc, 1371 CXXRecordDecl *ClassDecl) { 1372 bool HasDependentArg = false; 1373 for (unsigned i = 0; i < NumArgs; i++) 1374 HasDependentArg |= Args[i]->isTypeDependent(); 1375 1376 SourceLocation BaseLoc 1377 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1378 1379 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1380 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1381 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1382 1383 // C++ [class.base.init]p2: 1384 // [...] Unless the mem-initializer-id names a nonstatic data 1385 // member of the constructor’s class or a direct or virtual base 1386 // of that class, the mem-initializer is ill-formed. A 1387 // mem-initializer-list can initialize a base class using any 1388 // name that denotes that base class type. 1389 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1390 1391 // Check for direct and virtual base classes. 1392 const CXXBaseSpecifier *DirectBaseSpec = 0; 1393 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1394 if (!Dependent) { 1395 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1396 VirtualBaseSpec); 1397 1398 // C++ [base.class.init]p2: 1399 // Unless the mem-initializer-id names a nonstatic data member of the 1400 // constructor's class or a direct or virtual base of that class, the 1401 // mem-initializer is ill-formed. 1402 if (!DirectBaseSpec && !VirtualBaseSpec) { 1403 // If the class has any dependent bases, then it's possible that 1404 // one of those types will resolve to the same type as 1405 // BaseType. Therefore, just treat this as a dependent base 1406 // class initialization. FIXME: Should we try to check the 1407 // initialization anyway? It seems odd. 1408 if (ClassDecl->hasAnyDependentBases()) 1409 Dependent = true; 1410 else 1411 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1412 << BaseType << Context.getTypeDeclType(ClassDecl) 1413 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1414 } 1415 } 1416 1417 if (Dependent) { 1418 // Can't check initialization for a base of dependent type or when 1419 // any of the arguments are type-dependent expressions. 1420 OwningExprResult BaseInit 1421 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1422 RParenLoc)); 1423 1424 // Erase any temporaries within this evaluation context; we're not 1425 // going to track them in the AST, since we'll be rebuilding the 1426 // ASTs during template instantiation. 1427 ExprTemporaries.erase( 1428 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1429 ExprTemporaries.end()); 1430 1431 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1432 /*IsVirtual=*/false, 1433 LParenLoc, 1434 BaseInit.takeAs<Expr>(), 1435 RParenLoc); 1436 } 1437 1438 // C++ [base.class.init]p2: 1439 // If a mem-initializer-id is ambiguous because it designates both 1440 // a direct non-virtual base class and an inherited virtual base 1441 // class, the mem-initializer is ill-formed. 1442 if (DirectBaseSpec && VirtualBaseSpec) 1443 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1444 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1445 1446 CXXBaseSpecifier *BaseSpec 1447 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1448 if (!BaseSpec) 1449 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1450 1451 // Initialize the base. 1452 InitializedEntity BaseEntity = 1453 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1454 InitializationKind Kind = 1455 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1456 1457 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1458 1459 OwningExprResult BaseInit = 1460 InitSeq.Perform(*this, BaseEntity, Kind, 1461 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1462 if (BaseInit.isInvalid()) 1463 return true; 1464 1465 // C++0x [class.base.init]p7: 1466 // The initialization of each base and member constitutes a 1467 // full-expression. 1468 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1469 if (BaseInit.isInvalid()) 1470 return true; 1471 1472 // If we are in a dependent context, template instantiation will 1473 // perform this type-checking again. Just save the arguments that we 1474 // received in a ParenListExpr. 1475 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1476 // of the information that we have about the base 1477 // initializer. However, deconstructing the ASTs is a dicey process, 1478 // and this approach is far more likely to get the corner cases right. 1479 if (CurContext->isDependentContext()) { 1480 // Bump the reference count of all of the arguments. 1481 for (unsigned I = 0; I != NumArgs; ++I) 1482 Args[I]->Retain(); 1483 1484 OwningExprResult Init 1485 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1486 RParenLoc)); 1487 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1488 BaseSpec->isVirtual(), 1489 LParenLoc, 1490 Init.takeAs<Expr>(), 1491 RParenLoc); 1492 } 1493 1494 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1495 BaseSpec->isVirtual(), 1496 LParenLoc, 1497 BaseInit.takeAs<Expr>(), 1498 RParenLoc); 1499} 1500 1501/// ImplicitInitializerKind - How an implicit base or member initializer should 1502/// initialize its base or member. 1503enum ImplicitInitializerKind { 1504 IIK_Default, 1505 IIK_Copy, 1506 IIK_Move 1507}; 1508 1509static bool 1510BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1511 ImplicitInitializerKind ImplicitInitKind, 1512 CXXBaseSpecifier *BaseSpec, 1513 bool IsInheritedVirtualBase, 1514 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1515 InitializedEntity InitEntity 1516 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1517 IsInheritedVirtualBase); 1518 1519 Sema::OwningExprResult BaseInit(SemaRef); 1520 1521 switch (ImplicitInitKind) { 1522 case IIK_Default: { 1523 InitializationKind InitKind 1524 = InitializationKind::CreateDefault(Constructor->getLocation()); 1525 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1526 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1527 Sema::MultiExprArg(SemaRef, 0, 0)); 1528 break; 1529 } 1530 1531 case IIK_Copy: { 1532 ParmVarDecl *Param = Constructor->getParamDecl(0); 1533 QualType ParamType = Param->getType().getNonReferenceType(); 1534 1535 Expr *CopyCtorArg = 1536 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1537 Constructor->getLocation(), ParamType, 0); 1538 1539 // Cast to the base class to avoid ambiguities. 1540 QualType ArgTy = 1541 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1542 ParamType.getQualifiers()); 1543 1544 CXXCastPath BasePath; 1545 BasePath.push_back(BaseSpec); 1546 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1547 CastExpr::CK_UncheckedDerivedToBase, 1548 ImplicitCastExpr::LValue, &BasePath); 1549 1550 InitializationKind InitKind 1551 = InitializationKind::CreateDirect(Constructor->getLocation(), 1552 SourceLocation(), SourceLocation()); 1553 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1554 &CopyCtorArg, 1); 1555 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1556 Sema::MultiExprArg(SemaRef, 1557 (void**)&CopyCtorArg, 1)); 1558 break; 1559 } 1560 1561 case IIK_Move: 1562 assert(false && "Unhandled initializer kind!"); 1563 } 1564 1565 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1566 if (BaseInit.isInvalid()) 1567 return true; 1568 1569 CXXBaseInit = 1570 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1571 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1572 SourceLocation()), 1573 BaseSpec->isVirtual(), 1574 SourceLocation(), 1575 BaseInit.takeAs<Expr>(), 1576 SourceLocation()); 1577 1578 return false; 1579} 1580 1581static bool 1582BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1583 ImplicitInitializerKind ImplicitInitKind, 1584 FieldDecl *Field, 1585 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1586 if (Field->isInvalidDecl()) 1587 return true; 1588 1589 SourceLocation Loc = Constructor->getLocation(); 1590 1591 if (ImplicitInitKind == IIK_Copy) { 1592 ParmVarDecl *Param = Constructor->getParamDecl(0); 1593 QualType ParamType = Param->getType().getNonReferenceType(); 1594 1595 Expr *MemberExprBase = 1596 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1597 Loc, ParamType, 0); 1598 1599 // Build a reference to this field within the parameter. 1600 CXXScopeSpec SS; 1601 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1602 Sema::LookupMemberName); 1603 MemberLookup.addDecl(Field, AS_public); 1604 MemberLookup.resolveKind(); 1605 Sema::OwningExprResult CopyCtorArg 1606 = SemaRef.BuildMemberReferenceExpr(SemaRef.Owned(MemberExprBase), 1607 ParamType, Loc, 1608 /*IsArrow=*/false, 1609 SS, 1610 /*FirstQualifierInScope=*/0, 1611 MemberLookup, 1612 /*TemplateArgs=*/0); 1613 if (CopyCtorArg.isInvalid()) 1614 return true; 1615 1616 // When the field we are copying is an array, create index variables for 1617 // each dimension of the array. We use these index variables to subscript 1618 // the source array, and other clients (e.g., CodeGen) will perform the 1619 // necessary iteration with these index variables. 1620 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1621 QualType BaseType = Field->getType(); 1622 QualType SizeType = SemaRef.Context.getSizeType(); 1623 while (const ConstantArrayType *Array 1624 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1625 // Create the iteration variable for this array index. 1626 IdentifierInfo *IterationVarName = 0; 1627 { 1628 llvm::SmallString<8> Str; 1629 llvm::raw_svector_ostream OS(Str); 1630 OS << "__i" << IndexVariables.size(); 1631 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1632 } 1633 VarDecl *IterationVar 1634 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1635 IterationVarName, SizeType, 1636 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1637 VarDecl::None, VarDecl::None); 1638 IndexVariables.push_back(IterationVar); 1639 1640 // Create a reference to the iteration variable. 1641 Sema::OwningExprResult IterationVarRef 1642 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1643 assert(!IterationVarRef.isInvalid() && 1644 "Reference to invented variable cannot fail!"); 1645 1646 // Subscript the array with this iteration variable. 1647 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(move(CopyCtorArg), 1648 Loc, 1649 move(IterationVarRef), 1650 Loc); 1651 if (CopyCtorArg.isInvalid()) 1652 return true; 1653 1654 BaseType = Array->getElementType(); 1655 } 1656 1657 // Construct the entity that we will be initializing. For an array, this 1658 // will be first element in the array, which may require several levels 1659 // of array-subscript entities. 1660 llvm::SmallVector<InitializedEntity, 4> Entities; 1661 Entities.reserve(1 + IndexVariables.size()); 1662 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1663 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1664 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1665 0, 1666 Entities.back())); 1667 1668 // Direct-initialize to use the copy constructor. 1669 InitializationKind InitKind = 1670 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1671 1672 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1673 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1674 &CopyCtorArgE, 1); 1675 1676 Sema::OwningExprResult MemberInit 1677 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1678 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArgE, 1)); 1679 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1680 if (MemberInit.isInvalid()) 1681 return true; 1682 1683 CXXMemberInit 1684 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1685 MemberInit.takeAs<Expr>(), Loc, 1686 IndexVariables.data(), 1687 IndexVariables.size()); 1688 return false; 1689 } 1690 1691 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1692 1693 QualType FieldBaseElementType = 1694 SemaRef.Context.getBaseElementType(Field->getType()); 1695 1696 if (FieldBaseElementType->isRecordType()) { 1697 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1698 InitializationKind InitKind = 1699 InitializationKind::CreateDefault(Loc); 1700 1701 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1702 Sema::OwningExprResult MemberInit = 1703 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1704 Sema::MultiExprArg(SemaRef, 0, 0)); 1705 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1706 if (MemberInit.isInvalid()) 1707 return true; 1708 1709 CXXMemberInit = 1710 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1711 Field, Loc, Loc, 1712 MemberInit.takeAs<Expr>(), 1713 Loc); 1714 return false; 1715 } 1716 1717 if (FieldBaseElementType->isReferenceType()) { 1718 SemaRef.Diag(Constructor->getLocation(), 1719 diag::err_uninitialized_member_in_ctor) 1720 << (int)Constructor->isImplicit() 1721 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1722 << 0 << Field->getDeclName(); 1723 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1724 return true; 1725 } 1726 1727 if (FieldBaseElementType.isConstQualified()) { 1728 SemaRef.Diag(Constructor->getLocation(), 1729 diag::err_uninitialized_member_in_ctor) 1730 << (int)Constructor->isImplicit() 1731 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1732 << 1 << Field->getDeclName(); 1733 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1734 return true; 1735 } 1736 1737 // Nothing to initialize. 1738 CXXMemberInit = 0; 1739 return false; 1740} 1741 1742namespace { 1743struct BaseAndFieldInfo { 1744 Sema &S; 1745 CXXConstructorDecl *Ctor; 1746 bool AnyErrorsInInits; 1747 ImplicitInitializerKind IIK; 1748 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1749 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1750 1751 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1752 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1753 // FIXME: Handle implicit move constructors. 1754 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1755 IIK = IIK_Copy; 1756 else 1757 IIK = IIK_Default; 1758 } 1759}; 1760} 1761 1762static void RecordFieldInitializer(BaseAndFieldInfo &Info, 1763 FieldDecl *Top, FieldDecl *Field, 1764 CXXBaseOrMemberInitializer *Init) { 1765 // If the member doesn't need to be initialized, Init will still be null. 1766 if (!Init) 1767 return; 1768 1769 Info.AllToInit.push_back(Init); 1770 if (Field != Top) { 1771 Init->setMember(Top); 1772 Init->setAnonUnionMember(Field); 1773 } 1774} 1775 1776static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1777 FieldDecl *Top, FieldDecl *Field) { 1778 1779 // Overwhelmingly common case: we have a direct initializer for this field. 1780 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1781 RecordFieldInitializer(Info, Top, Field, Init); 1782 return false; 1783 } 1784 1785 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1786 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1787 assert(FieldClassType && "anonymous struct/union without record type"); 1788 CXXRecordDecl *FieldClassDecl 1789 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1790 1791 // Even though union members never have non-trivial default 1792 // constructions in C++03, we still build member initializers for aggregate 1793 // record types which can be union members, and C++0x allows non-trivial 1794 // default constructors for union members, so we ensure that only one 1795 // member is initialized for these. 1796 if (FieldClassDecl->isUnion()) { 1797 // First check for an explicit initializer for one field. 1798 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1799 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1800 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1801 RecordFieldInitializer(Info, Top, *FA, Init); 1802 1803 // Once we've initialized a field of an anonymous union, the union 1804 // field in the class is also initialized, so exit immediately. 1805 return false; 1806 } else if ((*FA)->isAnonymousStructOrUnion()) { 1807 if (CollectFieldInitializer(Info, Top, *FA)) 1808 return true; 1809 } 1810 } 1811 1812 // Fallthrough and construct a default initializer for the union as 1813 // a whole, which can call its default constructor if such a thing exists 1814 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1815 // behavior going forward with C++0x, when anonymous unions there are 1816 // finalized, we should revisit this. 1817 } else { 1818 // For structs, we simply descend through to initialize all members where 1819 // necessary. 1820 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1821 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1822 if (CollectFieldInitializer(Info, Top, *FA)) 1823 return true; 1824 } 1825 } 1826 } 1827 1828 // Don't try to build an implicit initializer if there were semantic 1829 // errors in any of the initializers (and therefore we might be 1830 // missing some that the user actually wrote). 1831 if (Info.AnyErrorsInInits) 1832 return false; 1833 1834 CXXBaseOrMemberInitializer *Init = 0; 1835 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1836 return true; 1837 1838 RecordFieldInitializer(Info, Top, Field, Init); 1839 return false; 1840} 1841 1842bool 1843Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1844 CXXBaseOrMemberInitializer **Initializers, 1845 unsigned NumInitializers, 1846 bool AnyErrors) { 1847 if (Constructor->getDeclContext()->isDependentContext()) { 1848 // Just store the initializers as written, they will be checked during 1849 // instantiation. 1850 if (NumInitializers > 0) { 1851 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1852 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1853 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1854 memcpy(baseOrMemberInitializers, Initializers, 1855 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1856 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1857 } 1858 1859 return false; 1860 } 1861 1862 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1863 1864 // We need to build the initializer AST according to order of construction 1865 // and not what user specified in the Initializers list. 1866 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1867 if (!ClassDecl) 1868 return true; 1869 1870 bool HadError = false; 1871 1872 for (unsigned i = 0; i < NumInitializers; i++) { 1873 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1874 1875 if (Member->isBaseInitializer()) 1876 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1877 else 1878 Info.AllBaseFields[Member->getMember()] = Member; 1879 } 1880 1881 // Keep track of the direct virtual bases. 1882 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1883 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1884 E = ClassDecl->bases_end(); I != E; ++I) { 1885 if (I->isVirtual()) 1886 DirectVBases.insert(I); 1887 } 1888 1889 // Push virtual bases before others. 1890 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1891 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1892 1893 if (CXXBaseOrMemberInitializer *Value 1894 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1895 Info.AllToInit.push_back(Value); 1896 } else if (!AnyErrors) { 1897 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1898 CXXBaseOrMemberInitializer *CXXBaseInit; 1899 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1900 VBase, IsInheritedVirtualBase, 1901 CXXBaseInit)) { 1902 HadError = true; 1903 continue; 1904 } 1905 1906 Info.AllToInit.push_back(CXXBaseInit); 1907 } 1908 } 1909 1910 // Non-virtual bases. 1911 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1912 E = ClassDecl->bases_end(); Base != E; ++Base) { 1913 // Virtuals are in the virtual base list and already constructed. 1914 if (Base->isVirtual()) 1915 continue; 1916 1917 if (CXXBaseOrMemberInitializer *Value 1918 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1919 Info.AllToInit.push_back(Value); 1920 } else if (!AnyErrors) { 1921 CXXBaseOrMemberInitializer *CXXBaseInit; 1922 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1923 Base, /*IsInheritedVirtualBase=*/false, 1924 CXXBaseInit)) { 1925 HadError = true; 1926 continue; 1927 } 1928 1929 Info.AllToInit.push_back(CXXBaseInit); 1930 } 1931 } 1932 1933 // Fields. 1934 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1935 E = ClassDecl->field_end(); Field != E; ++Field) { 1936 if ((*Field)->getType()->isIncompleteArrayType()) { 1937 assert(ClassDecl->hasFlexibleArrayMember() && 1938 "Incomplete array type is not valid"); 1939 continue; 1940 } 1941 if (CollectFieldInitializer(Info, *Field, *Field)) 1942 HadError = true; 1943 } 1944 1945 NumInitializers = Info.AllToInit.size(); 1946 if (NumInitializers > 0) { 1947 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1948 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1949 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1950 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1951 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1952 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1953 1954 // Constructors implicitly reference the base and member 1955 // destructors. 1956 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1957 Constructor->getParent()); 1958 } 1959 1960 return HadError; 1961} 1962 1963static void *GetKeyForTopLevelField(FieldDecl *Field) { 1964 // For anonymous unions, use the class declaration as the key. 1965 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1966 if (RT->getDecl()->isAnonymousStructOrUnion()) 1967 return static_cast<void *>(RT->getDecl()); 1968 } 1969 return static_cast<void *>(Field); 1970} 1971 1972static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1973 return Context.getCanonicalType(BaseType).getTypePtr(); 1974} 1975 1976static void *GetKeyForMember(ASTContext &Context, 1977 CXXBaseOrMemberInitializer *Member, 1978 bool MemberMaybeAnon = false) { 1979 if (!Member->isMemberInitializer()) 1980 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1981 1982 // For fields injected into the class via declaration of an anonymous union, 1983 // use its anonymous union class declaration as the unique key. 1984 FieldDecl *Field = Member->getMember(); 1985 1986 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1987 // data member of the class. Data member used in the initializer list is 1988 // in AnonUnionMember field. 1989 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1990 Field = Member->getAnonUnionMember(); 1991 1992 // If the field is a member of an anonymous struct or union, our key 1993 // is the anonymous record decl that's a direct child of the class. 1994 RecordDecl *RD = Field->getParent(); 1995 if (RD->isAnonymousStructOrUnion()) { 1996 while (true) { 1997 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1998 if (Parent->isAnonymousStructOrUnion()) 1999 RD = Parent; 2000 else 2001 break; 2002 } 2003 2004 return static_cast<void *>(RD); 2005 } 2006 2007 return static_cast<void *>(Field); 2008} 2009 2010static void 2011DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2012 const CXXConstructorDecl *Constructor, 2013 CXXBaseOrMemberInitializer **Inits, 2014 unsigned NumInits) { 2015 if (Constructor->getDeclContext()->isDependentContext()) 2016 return; 2017 2018 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 2019 == Diagnostic::Ignored) 2020 return; 2021 2022 // Build the list of bases and members in the order that they'll 2023 // actually be initialized. The explicit initializers should be in 2024 // this same order but may be missing things. 2025 llvm::SmallVector<const void*, 32> IdealInitKeys; 2026 2027 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2028 2029 // 1. Virtual bases. 2030 for (CXXRecordDecl::base_class_const_iterator VBase = 2031 ClassDecl->vbases_begin(), 2032 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2033 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2034 2035 // 2. Non-virtual bases. 2036 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2037 E = ClassDecl->bases_end(); Base != E; ++Base) { 2038 if (Base->isVirtual()) 2039 continue; 2040 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2041 } 2042 2043 // 3. Direct fields. 2044 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2045 E = ClassDecl->field_end(); Field != E; ++Field) 2046 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2047 2048 unsigned NumIdealInits = IdealInitKeys.size(); 2049 unsigned IdealIndex = 0; 2050 2051 CXXBaseOrMemberInitializer *PrevInit = 0; 2052 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2053 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2054 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2055 2056 // Scan forward to try to find this initializer in the idealized 2057 // initializers list. 2058 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2059 if (InitKey == IdealInitKeys[IdealIndex]) 2060 break; 2061 2062 // If we didn't find this initializer, it must be because we 2063 // scanned past it on a previous iteration. That can only 2064 // happen if we're out of order; emit a warning. 2065 if (IdealIndex == NumIdealInits && PrevInit) { 2066 Sema::SemaDiagnosticBuilder D = 2067 SemaRef.Diag(PrevInit->getSourceLocation(), 2068 diag::warn_initializer_out_of_order); 2069 2070 if (PrevInit->isMemberInitializer()) 2071 D << 0 << PrevInit->getMember()->getDeclName(); 2072 else 2073 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2074 2075 if (Init->isMemberInitializer()) 2076 D << 0 << Init->getMember()->getDeclName(); 2077 else 2078 D << 1 << Init->getBaseClassInfo()->getType(); 2079 2080 // Move back to the initializer's location in the ideal list. 2081 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2082 if (InitKey == IdealInitKeys[IdealIndex]) 2083 break; 2084 2085 assert(IdealIndex != NumIdealInits && 2086 "initializer not found in initializer list"); 2087 } 2088 2089 PrevInit = Init; 2090 } 2091} 2092 2093namespace { 2094bool CheckRedundantInit(Sema &S, 2095 CXXBaseOrMemberInitializer *Init, 2096 CXXBaseOrMemberInitializer *&PrevInit) { 2097 if (!PrevInit) { 2098 PrevInit = Init; 2099 return false; 2100 } 2101 2102 if (FieldDecl *Field = Init->getMember()) 2103 S.Diag(Init->getSourceLocation(), 2104 diag::err_multiple_mem_initialization) 2105 << Field->getDeclName() 2106 << Init->getSourceRange(); 2107 else { 2108 Type *BaseClass = Init->getBaseClass(); 2109 assert(BaseClass && "neither field nor base"); 2110 S.Diag(Init->getSourceLocation(), 2111 diag::err_multiple_base_initialization) 2112 << QualType(BaseClass, 0) 2113 << Init->getSourceRange(); 2114 } 2115 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2116 << 0 << PrevInit->getSourceRange(); 2117 2118 return true; 2119} 2120 2121typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2122typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2123 2124bool CheckRedundantUnionInit(Sema &S, 2125 CXXBaseOrMemberInitializer *Init, 2126 RedundantUnionMap &Unions) { 2127 FieldDecl *Field = Init->getMember(); 2128 RecordDecl *Parent = Field->getParent(); 2129 if (!Parent->isAnonymousStructOrUnion()) 2130 return false; 2131 2132 NamedDecl *Child = Field; 2133 do { 2134 if (Parent->isUnion()) { 2135 UnionEntry &En = Unions[Parent]; 2136 if (En.first && En.first != Child) { 2137 S.Diag(Init->getSourceLocation(), 2138 diag::err_multiple_mem_union_initialization) 2139 << Field->getDeclName() 2140 << Init->getSourceRange(); 2141 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2142 << 0 << En.second->getSourceRange(); 2143 return true; 2144 } else if (!En.first) { 2145 En.first = Child; 2146 En.second = Init; 2147 } 2148 } 2149 2150 Child = Parent; 2151 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2152 } while (Parent->isAnonymousStructOrUnion()); 2153 2154 return false; 2155} 2156} 2157 2158/// ActOnMemInitializers - Handle the member initializers for a constructor. 2159void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 2160 SourceLocation ColonLoc, 2161 MemInitTy **meminits, unsigned NumMemInits, 2162 bool AnyErrors) { 2163 if (!ConstructorDecl) 2164 return; 2165 2166 AdjustDeclIfTemplate(ConstructorDecl); 2167 2168 CXXConstructorDecl *Constructor 2169 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 2170 2171 if (!Constructor) { 2172 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2173 return; 2174 } 2175 2176 CXXBaseOrMemberInitializer **MemInits = 2177 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2178 2179 // Mapping for the duplicate initializers check. 2180 // For member initializers, this is keyed with a FieldDecl*. 2181 // For base initializers, this is keyed with a Type*. 2182 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2183 2184 // Mapping for the inconsistent anonymous-union initializers check. 2185 RedundantUnionMap MemberUnions; 2186 2187 bool HadError = false; 2188 for (unsigned i = 0; i < NumMemInits; i++) { 2189 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2190 2191 // Set the source order index. 2192 Init->setSourceOrder(i); 2193 2194 if (Init->isMemberInitializer()) { 2195 FieldDecl *Field = Init->getMember(); 2196 if (CheckRedundantInit(*this, Init, Members[Field]) || 2197 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2198 HadError = true; 2199 } else { 2200 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2201 if (CheckRedundantInit(*this, Init, Members[Key])) 2202 HadError = true; 2203 } 2204 } 2205 2206 if (HadError) 2207 return; 2208 2209 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2210 2211 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2212} 2213 2214void 2215Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2216 CXXRecordDecl *ClassDecl) { 2217 // Ignore dependent contexts. 2218 if (ClassDecl->isDependentContext()) 2219 return; 2220 2221 // FIXME: all the access-control diagnostics are positioned on the 2222 // field/base declaration. That's probably good; that said, the 2223 // user might reasonably want to know why the destructor is being 2224 // emitted, and we currently don't say. 2225 2226 // Non-static data members. 2227 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2228 E = ClassDecl->field_end(); I != E; ++I) { 2229 FieldDecl *Field = *I; 2230 if (Field->isInvalidDecl()) 2231 continue; 2232 QualType FieldType = Context.getBaseElementType(Field->getType()); 2233 2234 const RecordType* RT = FieldType->getAs<RecordType>(); 2235 if (!RT) 2236 continue; 2237 2238 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2239 if (FieldClassDecl->hasTrivialDestructor()) 2240 continue; 2241 2242 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2243 CheckDestructorAccess(Field->getLocation(), Dtor, 2244 PDiag(diag::err_access_dtor_field) 2245 << Field->getDeclName() 2246 << FieldType); 2247 2248 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2249 } 2250 2251 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2252 2253 // Bases. 2254 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2255 E = ClassDecl->bases_end(); Base != E; ++Base) { 2256 // Bases are always records in a well-formed non-dependent class. 2257 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2258 2259 // Remember direct virtual bases. 2260 if (Base->isVirtual()) 2261 DirectVirtualBases.insert(RT); 2262 2263 // Ignore trivial destructors. 2264 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2265 if (BaseClassDecl->hasTrivialDestructor()) 2266 continue; 2267 2268 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2269 2270 // FIXME: caret should be on the start of the class name 2271 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2272 PDiag(diag::err_access_dtor_base) 2273 << Base->getType() 2274 << Base->getSourceRange()); 2275 2276 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2277 } 2278 2279 // Virtual bases. 2280 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2281 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2282 2283 // Bases are always records in a well-formed non-dependent class. 2284 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2285 2286 // Ignore direct virtual bases. 2287 if (DirectVirtualBases.count(RT)) 2288 continue; 2289 2290 // Ignore trivial destructors. 2291 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2292 if (BaseClassDecl->hasTrivialDestructor()) 2293 continue; 2294 2295 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2296 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2297 PDiag(diag::err_access_dtor_vbase) 2298 << VBase->getType()); 2299 2300 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2301 } 2302} 2303 2304void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2305 if (!CDtorDecl) 2306 return; 2307 2308 if (CXXConstructorDecl *Constructor 2309 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2310 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2311} 2312 2313bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2314 unsigned DiagID, AbstractDiagSelID SelID) { 2315 if (SelID == -1) 2316 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2317 else 2318 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2319} 2320 2321bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2322 const PartialDiagnostic &PD) { 2323 if (!getLangOptions().CPlusPlus) 2324 return false; 2325 2326 if (const ArrayType *AT = Context.getAsArrayType(T)) 2327 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2328 2329 if (const PointerType *PT = T->getAs<PointerType>()) { 2330 // Find the innermost pointer type. 2331 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2332 PT = T; 2333 2334 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2335 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2336 } 2337 2338 const RecordType *RT = T->getAs<RecordType>(); 2339 if (!RT) 2340 return false; 2341 2342 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2343 2344 // We can't answer whether something is abstract until it has a 2345 // definition. If it's currently being defined, we'll walk back 2346 // over all the declarations when we have a full definition. 2347 const CXXRecordDecl *Def = RD->getDefinition(); 2348 if (!Def || Def->isBeingDefined()) 2349 return false; 2350 2351 if (!RD->isAbstract()) 2352 return false; 2353 2354 Diag(Loc, PD) << RD->getDeclName(); 2355 DiagnoseAbstractType(RD); 2356 2357 return true; 2358} 2359 2360void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2361 // Check if we've already emitted the list of pure virtual functions 2362 // for this class. 2363 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2364 return; 2365 2366 CXXFinalOverriderMap FinalOverriders; 2367 RD->getFinalOverriders(FinalOverriders); 2368 2369 // Keep a set of seen pure methods so we won't diagnose the same method 2370 // more than once. 2371 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2372 2373 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2374 MEnd = FinalOverriders.end(); 2375 M != MEnd; 2376 ++M) { 2377 for (OverridingMethods::iterator SO = M->second.begin(), 2378 SOEnd = M->second.end(); 2379 SO != SOEnd; ++SO) { 2380 // C++ [class.abstract]p4: 2381 // A class is abstract if it contains or inherits at least one 2382 // pure virtual function for which the final overrider is pure 2383 // virtual. 2384 2385 // 2386 if (SO->second.size() != 1) 2387 continue; 2388 2389 if (!SO->second.front().Method->isPure()) 2390 continue; 2391 2392 if (!SeenPureMethods.insert(SO->second.front().Method)) 2393 continue; 2394 2395 Diag(SO->second.front().Method->getLocation(), 2396 diag::note_pure_virtual_function) 2397 << SO->second.front().Method->getDeclName(); 2398 } 2399 } 2400 2401 if (!PureVirtualClassDiagSet) 2402 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2403 PureVirtualClassDiagSet->insert(RD); 2404} 2405 2406namespace { 2407struct AbstractUsageInfo { 2408 Sema &S; 2409 CXXRecordDecl *Record; 2410 CanQualType AbstractType; 2411 bool Invalid; 2412 2413 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2414 : S(S), Record(Record), 2415 AbstractType(S.Context.getCanonicalType( 2416 S.Context.getTypeDeclType(Record))), 2417 Invalid(false) {} 2418 2419 void DiagnoseAbstractType() { 2420 if (Invalid) return; 2421 S.DiagnoseAbstractType(Record); 2422 Invalid = true; 2423 } 2424 2425 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2426}; 2427 2428struct CheckAbstractUsage { 2429 AbstractUsageInfo &Info; 2430 const NamedDecl *Ctx; 2431 2432 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2433 : Info(Info), Ctx(Ctx) {} 2434 2435 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2436 switch (TL.getTypeLocClass()) { 2437#define ABSTRACT_TYPELOC(CLASS, PARENT) 2438#define TYPELOC(CLASS, PARENT) \ 2439 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2440#include "clang/AST/TypeLocNodes.def" 2441 } 2442 } 2443 2444 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2445 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2446 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2447 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2448 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2449 } 2450 } 2451 2452 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2453 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2454 } 2455 2456 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2457 // Visit the type parameters from a permissive context. 2458 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2459 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2460 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2461 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2462 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2463 // TODO: other template argument types? 2464 } 2465 } 2466 2467 // Visit pointee types from a permissive context. 2468#define CheckPolymorphic(Type) \ 2469 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2470 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2471 } 2472 CheckPolymorphic(PointerTypeLoc) 2473 CheckPolymorphic(ReferenceTypeLoc) 2474 CheckPolymorphic(MemberPointerTypeLoc) 2475 CheckPolymorphic(BlockPointerTypeLoc) 2476 2477 /// Handle all the types we haven't given a more specific 2478 /// implementation for above. 2479 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2480 // Every other kind of type that we haven't called out already 2481 // that has an inner type is either (1) sugar or (2) contains that 2482 // inner type in some way as a subobject. 2483 if (TypeLoc Next = TL.getNextTypeLoc()) 2484 return Visit(Next, Sel); 2485 2486 // If there's no inner type and we're in a permissive context, 2487 // don't diagnose. 2488 if (Sel == Sema::AbstractNone) return; 2489 2490 // Check whether the type matches the abstract type. 2491 QualType T = TL.getType(); 2492 if (T->isArrayType()) { 2493 Sel = Sema::AbstractArrayType; 2494 T = Info.S.Context.getBaseElementType(T); 2495 } 2496 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2497 if (CT != Info.AbstractType) return; 2498 2499 // It matched; do some magic. 2500 if (Sel == Sema::AbstractArrayType) { 2501 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2502 << T << TL.getSourceRange(); 2503 } else { 2504 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2505 << Sel << T << TL.getSourceRange(); 2506 } 2507 Info.DiagnoseAbstractType(); 2508 } 2509}; 2510 2511void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2512 Sema::AbstractDiagSelID Sel) { 2513 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2514} 2515 2516} 2517 2518/// Check for invalid uses of an abstract type in a method declaration. 2519static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2520 CXXMethodDecl *MD) { 2521 // No need to do the check on definitions, which require that 2522 // the return/param types be complete. 2523 if (MD->isThisDeclarationADefinition()) 2524 return; 2525 2526 // For safety's sake, just ignore it if we don't have type source 2527 // information. This should never happen for non-implicit methods, 2528 // but... 2529 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2530 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2531} 2532 2533/// Check for invalid uses of an abstract type within a class definition. 2534static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2535 CXXRecordDecl *RD) { 2536 for (CXXRecordDecl::decl_iterator 2537 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2538 Decl *D = *I; 2539 if (D->isImplicit()) continue; 2540 2541 // Methods and method templates. 2542 if (isa<CXXMethodDecl>(D)) { 2543 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2544 } else if (isa<FunctionTemplateDecl>(D)) { 2545 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2546 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2547 2548 // Fields and static variables. 2549 } else if (isa<FieldDecl>(D)) { 2550 FieldDecl *FD = cast<FieldDecl>(D); 2551 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2552 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2553 } else if (isa<VarDecl>(D)) { 2554 VarDecl *VD = cast<VarDecl>(D); 2555 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2556 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2557 2558 // Nested classes and class templates. 2559 } else if (isa<CXXRecordDecl>(D)) { 2560 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2561 } else if (isa<ClassTemplateDecl>(D)) { 2562 CheckAbstractClassUsage(Info, 2563 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2564 } 2565 } 2566} 2567 2568/// \brief Perform semantic checks on a class definition that has been 2569/// completing, introducing implicitly-declared members, checking for 2570/// abstract types, etc. 2571void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2572 if (!Record || Record->isInvalidDecl()) 2573 return; 2574 2575 if (!Record->isDependentType()) 2576 AddImplicitlyDeclaredMembersToClass(Record); 2577 2578 if (Record->isInvalidDecl()) 2579 return; 2580 2581 // Set access bits correctly on the directly-declared conversions. 2582 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2583 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2584 Convs->setAccess(I, (*I)->getAccess()); 2585 2586 // Determine whether we need to check for final overriders. We do 2587 // this either when there are virtual base classes (in which case we 2588 // may end up finding multiple final overriders for a given virtual 2589 // function) or any of the base classes is abstract (in which case 2590 // we might detect that this class is abstract). 2591 bool CheckFinalOverriders = false; 2592 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2593 !Record->isDependentType()) { 2594 if (Record->getNumVBases()) 2595 CheckFinalOverriders = true; 2596 else if (!Record->isAbstract()) { 2597 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2598 BEnd = Record->bases_end(); 2599 B != BEnd; ++B) { 2600 CXXRecordDecl *BaseDecl 2601 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2602 if (BaseDecl->isAbstract()) { 2603 CheckFinalOverriders = true; 2604 break; 2605 } 2606 } 2607 } 2608 } 2609 2610 if (CheckFinalOverriders) { 2611 CXXFinalOverriderMap FinalOverriders; 2612 Record->getFinalOverriders(FinalOverriders); 2613 2614 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2615 MEnd = FinalOverriders.end(); 2616 M != MEnd; ++M) { 2617 for (OverridingMethods::iterator SO = M->second.begin(), 2618 SOEnd = M->second.end(); 2619 SO != SOEnd; ++SO) { 2620 assert(SO->second.size() > 0 && 2621 "All virtual functions have overridding virtual functions"); 2622 if (SO->second.size() == 1) { 2623 // C++ [class.abstract]p4: 2624 // A class is abstract if it contains or inherits at least one 2625 // pure virtual function for which the final overrider is pure 2626 // virtual. 2627 if (SO->second.front().Method->isPure()) 2628 Record->setAbstract(true); 2629 continue; 2630 } 2631 2632 // C++ [class.virtual]p2: 2633 // In a derived class, if a virtual member function of a base 2634 // class subobject has more than one final overrider the 2635 // program is ill-formed. 2636 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2637 << (NamedDecl *)M->first << Record; 2638 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2639 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2640 OMEnd = SO->second.end(); 2641 OM != OMEnd; ++OM) 2642 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2643 << (NamedDecl *)M->first << OM->Method->getParent(); 2644 2645 Record->setInvalidDecl(); 2646 } 2647 } 2648 } 2649 2650 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2651 AbstractUsageInfo Info(*this, Record); 2652 CheckAbstractClassUsage(Info, Record); 2653 } 2654 2655 // If this is not an aggregate type and has no user-declared constructor, 2656 // complain about any non-static data members of reference or const scalar 2657 // type, since they will never get initializers. 2658 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2659 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2660 bool Complained = false; 2661 for (RecordDecl::field_iterator F = Record->field_begin(), 2662 FEnd = Record->field_end(); 2663 F != FEnd; ++F) { 2664 if (F->getType()->isReferenceType() || 2665 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2666 if (!Complained) { 2667 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2668 << Record->getTagKind() << Record; 2669 Complained = true; 2670 } 2671 2672 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2673 << F->getType()->isReferenceType() 2674 << F->getDeclName(); 2675 } 2676 } 2677 } 2678 2679 if (Record->isDynamicClass()) 2680 DynamicClasses.push_back(Record); 2681} 2682 2683void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2684 DeclPtrTy TagDecl, 2685 SourceLocation LBrac, 2686 SourceLocation RBrac, 2687 AttributeList *AttrList) { 2688 if (!TagDecl) 2689 return; 2690 2691 AdjustDeclIfTemplate(TagDecl); 2692 2693 ActOnFields(S, RLoc, TagDecl, 2694 (DeclPtrTy*)FieldCollector->getCurFields(), 2695 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2696 2697 CheckCompletedCXXClass( 2698 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2699} 2700 2701namespace { 2702 /// \brief Helper class that collects exception specifications for 2703 /// implicitly-declared special member functions. 2704 class ImplicitExceptionSpecification { 2705 ASTContext &Context; 2706 bool AllowsAllExceptions; 2707 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2708 llvm::SmallVector<QualType, 4> Exceptions; 2709 2710 public: 2711 explicit ImplicitExceptionSpecification(ASTContext &Context) 2712 : Context(Context), AllowsAllExceptions(false) { } 2713 2714 /// \brief Whether the special member function should have any 2715 /// exception specification at all. 2716 bool hasExceptionSpecification() const { 2717 return !AllowsAllExceptions; 2718 } 2719 2720 /// \brief Whether the special member function should have a 2721 /// throw(...) exception specification (a Microsoft extension). 2722 bool hasAnyExceptionSpecification() const { 2723 return false; 2724 } 2725 2726 /// \brief The number of exceptions in the exception specification. 2727 unsigned size() const { return Exceptions.size(); } 2728 2729 /// \brief The set of exceptions in the exception specification. 2730 const QualType *data() const { return Exceptions.data(); } 2731 2732 /// \brief Note that 2733 void CalledDecl(CXXMethodDecl *Method) { 2734 // If we already know that we allow all exceptions, do nothing. 2735 if (AllowsAllExceptions || !Method) 2736 return; 2737 2738 const FunctionProtoType *Proto 2739 = Method->getType()->getAs<FunctionProtoType>(); 2740 2741 // If this function can throw any exceptions, make a note of that. 2742 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2743 AllowsAllExceptions = true; 2744 ExceptionsSeen.clear(); 2745 Exceptions.clear(); 2746 return; 2747 } 2748 2749 // Record the exceptions in this function's exception specification. 2750 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2751 EEnd = Proto->exception_end(); 2752 E != EEnd; ++E) 2753 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2754 Exceptions.push_back(*E); 2755 } 2756 }; 2757} 2758 2759 2760/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2761/// special functions, such as the default constructor, copy 2762/// constructor, or destructor, to the given C++ class (C++ 2763/// [special]p1). This routine can only be executed just before the 2764/// definition of the class is complete. 2765void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2766 if (!ClassDecl->hasUserDeclaredConstructor()) 2767 ++ASTContext::NumImplicitDefaultConstructors; 2768 2769 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2770 ++ASTContext::NumImplicitCopyConstructors; 2771 2772 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2773 ++ASTContext::NumImplicitCopyAssignmentOperators; 2774 2775 // If we have a dynamic class, then the copy assignment operator may be 2776 // virtual, so we have to declare it immediately. This ensures that, e.g., 2777 // it shows up in the right place in the vtable and that we diagnose 2778 // problems with the implicit exception specification. 2779 if (ClassDecl->isDynamicClass()) 2780 DeclareImplicitCopyAssignment(ClassDecl); 2781 } 2782 2783 if (!ClassDecl->hasUserDeclaredDestructor()) { 2784 ++ASTContext::NumImplicitDestructors; 2785 2786 // If we have a dynamic class, then the destructor may be virtual, so we 2787 // have to declare the destructor immediately. This ensures that, e.g., it 2788 // shows up in the right place in the vtable and that we diagnose problems 2789 // with the implicit exception specification. 2790 if (ClassDecl->isDynamicClass()) 2791 DeclareImplicitDestructor(ClassDecl); 2792 } 2793} 2794 2795void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2796 Decl *D = TemplateD.getAs<Decl>(); 2797 if (!D) 2798 return; 2799 2800 TemplateParameterList *Params = 0; 2801 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2802 Params = Template->getTemplateParameters(); 2803 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2804 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2805 Params = PartialSpec->getTemplateParameters(); 2806 else 2807 return; 2808 2809 for (TemplateParameterList::iterator Param = Params->begin(), 2810 ParamEnd = Params->end(); 2811 Param != ParamEnd; ++Param) { 2812 NamedDecl *Named = cast<NamedDecl>(*Param); 2813 if (Named->getDeclName()) { 2814 S->AddDecl(DeclPtrTy::make(Named)); 2815 IdResolver.AddDecl(Named); 2816 } 2817 } 2818} 2819 2820void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2821 if (!RecordD) return; 2822 AdjustDeclIfTemplate(RecordD); 2823 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2824 PushDeclContext(S, Record); 2825} 2826 2827void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2828 if (!RecordD) return; 2829 PopDeclContext(); 2830} 2831 2832/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2833/// parsing a top-level (non-nested) C++ class, and we are now 2834/// parsing those parts of the given Method declaration that could 2835/// not be parsed earlier (C++ [class.mem]p2), such as default 2836/// arguments. This action should enter the scope of the given 2837/// Method declaration as if we had just parsed the qualified method 2838/// name. However, it should not bring the parameters into scope; 2839/// that will be performed by ActOnDelayedCXXMethodParameter. 2840void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2841} 2842 2843/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2844/// C++ method declaration. We're (re-)introducing the given 2845/// function parameter into scope for use in parsing later parts of 2846/// the method declaration. For example, we could see an 2847/// ActOnParamDefaultArgument event for this parameter. 2848void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2849 if (!ParamD) 2850 return; 2851 2852 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2853 2854 // If this parameter has an unparsed default argument, clear it out 2855 // to make way for the parsed default argument. 2856 if (Param->hasUnparsedDefaultArg()) 2857 Param->setDefaultArg(0); 2858 2859 S->AddDecl(DeclPtrTy::make(Param)); 2860 if (Param->getDeclName()) 2861 IdResolver.AddDecl(Param); 2862} 2863 2864/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2865/// processing the delayed method declaration for Method. The method 2866/// declaration is now considered finished. There may be a separate 2867/// ActOnStartOfFunctionDef action later (not necessarily 2868/// immediately!) for this method, if it was also defined inside the 2869/// class body. 2870void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2871 if (!MethodD) 2872 return; 2873 2874 AdjustDeclIfTemplate(MethodD); 2875 2876 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2877 2878 // Now that we have our default arguments, check the constructor 2879 // again. It could produce additional diagnostics or affect whether 2880 // the class has implicitly-declared destructors, among other 2881 // things. 2882 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2883 CheckConstructor(Constructor); 2884 2885 // Check the default arguments, which we may have added. 2886 if (!Method->isInvalidDecl()) 2887 CheckCXXDefaultArguments(Method); 2888} 2889 2890/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2891/// the well-formedness of the constructor declarator @p D with type @p 2892/// R. If there are any errors in the declarator, this routine will 2893/// emit diagnostics and set the invalid bit to true. In any case, the type 2894/// will be updated to reflect a well-formed type for the constructor and 2895/// returned. 2896QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2897 FunctionDecl::StorageClass &SC) { 2898 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2899 2900 // C++ [class.ctor]p3: 2901 // A constructor shall not be virtual (10.3) or static (9.4). A 2902 // constructor can be invoked for a const, volatile or const 2903 // volatile object. A constructor shall not be declared const, 2904 // volatile, or const volatile (9.3.2). 2905 if (isVirtual) { 2906 if (!D.isInvalidType()) 2907 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2908 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2909 << SourceRange(D.getIdentifierLoc()); 2910 D.setInvalidType(); 2911 } 2912 if (SC == FunctionDecl::Static) { 2913 if (!D.isInvalidType()) 2914 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2915 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2916 << SourceRange(D.getIdentifierLoc()); 2917 D.setInvalidType(); 2918 SC = FunctionDecl::None; 2919 } 2920 2921 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2922 if (FTI.TypeQuals != 0) { 2923 if (FTI.TypeQuals & Qualifiers::Const) 2924 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2925 << "const" << SourceRange(D.getIdentifierLoc()); 2926 if (FTI.TypeQuals & Qualifiers::Volatile) 2927 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2928 << "volatile" << SourceRange(D.getIdentifierLoc()); 2929 if (FTI.TypeQuals & Qualifiers::Restrict) 2930 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2931 << "restrict" << SourceRange(D.getIdentifierLoc()); 2932 } 2933 2934 // Rebuild the function type "R" without any type qualifiers (in 2935 // case any of the errors above fired) and with "void" as the 2936 // return type, since constructors don't have return types. 2937 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2938 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2939 Proto->getNumArgs(), 2940 Proto->isVariadic(), 0, 2941 Proto->hasExceptionSpec(), 2942 Proto->hasAnyExceptionSpec(), 2943 Proto->getNumExceptions(), 2944 Proto->exception_begin(), 2945 Proto->getExtInfo()); 2946} 2947 2948/// CheckConstructor - Checks a fully-formed constructor for 2949/// well-formedness, issuing any diagnostics required. Returns true if 2950/// the constructor declarator is invalid. 2951void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2952 CXXRecordDecl *ClassDecl 2953 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2954 if (!ClassDecl) 2955 return Constructor->setInvalidDecl(); 2956 2957 // C++ [class.copy]p3: 2958 // A declaration of a constructor for a class X is ill-formed if 2959 // its first parameter is of type (optionally cv-qualified) X and 2960 // either there are no other parameters or else all other 2961 // parameters have default arguments. 2962 if (!Constructor->isInvalidDecl() && 2963 ((Constructor->getNumParams() == 1) || 2964 (Constructor->getNumParams() > 1 && 2965 Constructor->getParamDecl(1)->hasDefaultArg())) && 2966 Constructor->getTemplateSpecializationKind() 2967 != TSK_ImplicitInstantiation) { 2968 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2969 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2970 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2971 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2972 const char *ConstRef 2973 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2974 : " const &"; 2975 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2976 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 2977 2978 // FIXME: Rather that making the constructor invalid, we should endeavor 2979 // to fix the type. 2980 Constructor->setInvalidDecl(); 2981 } 2982 } 2983 2984 // Notify the class that we've added a constructor. In principle we 2985 // don't need to do this for out-of-line declarations; in practice 2986 // we only instantiate the most recent declaration of a method, so 2987 // we have to call this for everything but friends. 2988 if (!Constructor->getFriendObjectKind()) 2989 ClassDecl->addedConstructor(Context, Constructor); 2990} 2991 2992/// CheckDestructor - Checks a fully-formed destructor definition for 2993/// well-formedness, issuing any diagnostics required. Returns true 2994/// on error. 2995bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2996 CXXRecordDecl *RD = Destructor->getParent(); 2997 2998 if (Destructor->isVirtual()) { 2999 SourceLocation Loc; 3000 3001 if (!Destructor->isImplicit()) 3002 Loc = Destructor->getLocation(); 3003 else 3004 Loc = RD->getLocation(); 3005 3006 // If we have a virtual destructor, look up the deallocation function 3007 FunctionDecl *OperatorDelete = 0; 3008 DeclarationName Name = 3009 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3010 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3011 return true; 3012 3013 MarkDeclarationReferenced(Loc, OperatorDelete); 3014 3015 Destructor->setOperatorDelete(OperatorDelete); 3016 } 3017 3018 return false; 3019} 3020 3021static inline bool 3022FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3023 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3024 FTI.ArgInfo[0].Param && 3025 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 3026} 3027 3028/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3029/// the well-formednes of the destructor declarator @p D with type @p 3030/// R. If there are any errors in the declarator, this routine will 3031/// emit diagnostics and set the declarator to invalid. Even if this happens, 3032/// will be updated to reflect a well-formed type for the destructor and 3033/// returned. 3034QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3035 FunctionDecl::StorageClass& SC) { 3036 // C++ [class.dtor]p1: 3037 // [...] A typedef-name that names a class is a class-name 3038 // (7.1.3); however, a typedef-name that names a class shall not 3039 // be used as the identifier in the declarator for a destructor 3040 // declaration. 3041 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3042 if (isa<TypedefType>(DeclaratorType)) 3043 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3044 << DeclaratorType; 3045 3046 // C++ [class.dtor]p2: 3047 // A destructor is used to destroy objects of its class type. A 3048 // destructor takes no parameters, and no return type can be 3049 // specified for it (not even void). The address of a destructor 3050 // shall not be taken. A destructor shall not be static. A 3051 // destructor can be invoked for a const, volatile or const 3052 // volatile object. A destructor shall not be declared const, 3053 // volatile or const volatile (9.3.2). 3054 if (SC == FunctionDecl::Static) { 3055 if (!D.isInvalidType()) 3056 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3057 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3058 << SourceRange(D.getIdentifierLoc()) 3059 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3060 3061 SC = FunctionDecl::None; 3062 } 3063 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3064 // Destructors don't have return types, but the parser will 3065 // happily parse something like: 3066 // 3067 // class X { 3068 // float ~X(); 3069 // }; 3070 // 3071 // The return type will be eliminated later. 3072 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3073 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3074 << SourceRange(D.getIdentifierLoc()); 3075 } 3076 3077 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3078 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3079 if (FTI.TypeQuals & Qualifiers::Const) 3080 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3081 << "const" << SourceRange(D.getIdentifierLoc()); 3082 if (FTI.TypeQuals & Qualifiers::Volatile) 3083 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3084 << "volatile" << SourceRange(D.getIdentifierLoc()); 3085 if (FTI.TypeQuals & Qualifiers::Restrict) 3086 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3087 << "restrict" << SourceRange(D.getIdentifierLoc()); 3088 D.setInvalidType(); 3089 } 3090 3091 // Make sure we don't have any parameters. 3092 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3093 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3094 3095 // Delete the parameters. 3096 FTI.freeArgs(); 3097 D.setInvalidType(); 3098 } 3099 3100 // Make sure the destructor isn't variadic. 3101 if (FTI.isVariadic) { 3102 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3103 D.setInvalidType(); 3104 } 3105 3106 // Rebuild the function type "R" without any type qualifiers or 3107 // parameters (in case any of the errors above fired) and with 3108 // "void" as the return type, since destructors don't have return 3109 // types. 3110 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3111 if (!Proto) 3112 return QualType(); 3113 3114 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3115 Proto->hasExceptionSpec(), 3116 Proto->hasAnyExceptionSpec(), 3117 Proto->getNumExceptions(), 3118 Proto->exception_begin(), 3119 Proto->getExtInfo()); 3120} 3121 3122/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3123/// well-formednes of the conversion function declarator @p D with 3124/// type @p R. If there are any errors in the declarator, this routine 3125/// will emit diagnostics and return true. Otherwise, it will return 3126/// false. Either way, the type @p R will be updated to reflect a 3127/// well-formed type for the conversion operator. 3128void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3129 FunctionDecl::StorageClass& SC) { 3130 // C++ [class.conv.fct]p1: 3131 // Neither parameter types nor return type can be specified. The 3132 // type of a conversion function (8.3.5) is "function taking no 3133 // parameter returning conversion-type-id." 3134 if (SC == FunctionDecl::Static) { 3135 if (!D.isInvalidType()) 3136 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3137 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3138 << SourceRange(D.getIdentifierLoc()); 3139 D.setInvalidType(); 3140 SC = FunctionDecl::None; 3141 } 3142 3143 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3144 3145 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3146 // Conversion functions don't have return types, but the parser will 3147 // happily parse something like: 3148 // 3149 // class X { 3150 // float operator bool(); 3151 // }; 3152 // 3153 // The return type will be changed later anyway. 3154 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3155 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3156 << SourceRange(D.getIdentifierLoc()); 3157 D.setInvalidType(); 3158 } 3159 3160 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3161 3162 // Make sure we don't have any parameters. 3163 if (Proto->getNumArgs() > 0) { 3164 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3165 3166 // Delete the parameters. 3167 D.getTypeObject(0).Fun.freeArgs(); 3168 D.setInvalidType(); 3169 } else if (Proto->isVariadic()) { 3170 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3171 D.setInvalidType(); 3172 } 3173 3174 // Diagnose "&operator bool()" and other such nonsense. This 3175 // is actually a gcc extension which we don't support. 3176 if (Proto->getResultType() != ConvType) { 3177 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3178 << Proto->getResultType(); 3179 D.setInvalidType(); 3180 ConvType = Proto->getResultType(); 3181 } 3182 3183 // C++ [class.conv.fct]p4: 3184 // The conversion-type-id shall not represent a function type nor 3185 // an array type. 3186 if (ConvType->isArrayType()) { 3187 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3188 ConvType = Context.getPointerType(ConvType); 3189 D.setInvalidType(); 3190 } else if (ConvType->isFunctionType()) { 3191 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3192 ConvType = Context.getPointerType(ConvType); 3193 D.setInvalidType(); 3194 } 3195 3196 // Rebuild the function type "R" without any parameters (in case any 3197 // of the errors above fired) and with the conversion type as the 3198 // return type. 3199 if (D.isInvalidType()) { 3200 R = Context.getFunctionType(ConvType, 0, 0, false, 3201 Proto->getTypeQuals(), 3202 Proto->hasExceptionSpec(), 3203 Proto->hasAnyExceptionSpec(), 3204 Proto->getNumExceptions(), 3205 Proto->exception_begin(), 3206 Proto->getExtInfo()); 3207 } 3208 3209 // C++0x explicit conversion operators. 3210 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3211 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3212 diag::warn_explicit_conversion_functions) 3213 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3214} 3215 3216/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3217/// the declaration of the given C++ conversion function. This routine 3218/// is responsible for recording the conversion function in the C++ 3219/// class, if possible. 3220Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3221 assert(Conversion && "Expected to receive a conversion function declaration"); 3222 3223 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3224 3225 // Make sure we aren't redeclaring the conversion function. 3226 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3227 3228 // C++ [class.conv.fct]p1: 3229 // [...] A conversion function is never used to convert a 3230 // (possibly cv-qualified) object to the (possibly cv-qualified) 3231 // same object type (or a reference to it), to a (possibly 3232 // cv-qualified) base class of that type (or a reference to it), 3233 // or to (possibly cv-qualified) void. 3234 // FIXME: Suppress this warning if the conversion function ends up being a 3235 // virtual function that overrides a virtual function in a base class. 3236 QualType ClassType 3237 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3238 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3239 ConvType = ConvTypeRef->getPointeeType(); 3240 if (ConvType->isRecordType()) { 3241 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3242 if (ConvType == ClassType) 3243 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3244 << ClassType; 3245 else if (IsDerivedFrom(ClassType, ConvType)) 3246 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3247 << ClassType << ConvType; 3248 } else if (ConvType->isVoidType()) { 3249 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3250 << ClassType << ConvType; 3251 } 3252 3253 if (Conversion->getPrimaryTemplate()) { 3254 // ignore specializations 3255 } else if (Conversion->getPreviousDeclaration()) { 3256 if (FunctionTemplateDecl *ConversionTemplate 3257 = Conversion->getDescribedFunctionTemplate()) { 3258 if (ClassDecl->replaceConversion( 3259 ConversionTemplate->getPreviousDeclaration(), 3260 ConversionTemplate)) 3261 return DeclPtrTy::make(ConversionTemplate); 3262 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3263 Conversion)) 3264 return DeclPtrTy::make(Conversion); 3265 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3266 } else if (FunctionTemplateDecl *ConversionTemplate 3267 = Conversion->getDescribedFunctionTemplate()) 3268 ClassDecl->addConversionFunction(ConversionTemplate); 3269 else 3270 ClassDecl->addConversionFunction(Conversion); 3271 3272 return DeclPtrTy::make(Conversion); 3273} 3274 3275//===----------------------------------------------------------------------===// 3276// Namespace Handling 3277//===----------------------------------------------------------------------===// 3278 3279/// ActOnStartNamespaceDef - This is called at the start of a namespace 3280/// definition. 3281Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3282 SourceLocation IdentLoc, 3283 IdentifierInfo *II, 3284 SourceLocation LBrace, 3285 AttributeList *AttrList) { 3286 // anonymous namespace starts at its left brace 3287 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3288 (II ? IdentLoc : LBrace) , II); 3289 Namespc->setLBracLoc(LBrace); 3290 3291 Scope *DeclRegionScope = NamespcScope->getParent(); 3292 3293 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3294 3295 if (const VisibilityAttr *attr = Namespc->getAttr<VisibilityAttr>()) 3296 PushPragmaVisibility(attr->getVisibility(), attr->getLocation()); 3297 3298 if (II) { 3299 // C++ [namespace.def]p2: 3300 // The identifier in an original-namespace-definition shall not have been 3301 // previously defined in the declarative region in which the 3302 // original-namespace-definition appears. The identifier in an 3303 // original-namespace-definition is the name of the namespace. Subsequently 3304 // in that declarative region, it is treated as an original-namespace-name. 3305 3306 NamedDecl *PrevDecl 3307 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3308 ForRedeclaration); 3309 3310 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3311 // This is an extended namespace definition. 3312 // Attach this namespace decl to the chain of extended namespace 3313 // definitions. 3314 OrigNS->setNextNamespace(Namespc); 3315 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3316 3317 // Remove the previous declaration from the scope. 3318 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3319 IdResolver.RemoveDecl(OrigNS); 3320 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3321 } 3322 } else if (PrevDecl) { 3323 // This is an invalid name redefinition. 3324 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3325 << Namespc->getDeclName(); 3326 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3327 Namespc->setInvalidDecl(); 3328 // Continue on to push Namespc as current DeclContext and return it. 3329 } else if (II->isStr("std") && 3330 CurContext->getLookupContext()->isTranslationUnit()) { 3331 // This is the first "real" definition of the namespace "std", so update 3332 // our cache of the "std" namespace to point at this definition. 3333 if (NamespaceDecl *StdNS = getStdNamespace()) { 3334 // We had already defined a dummy namespace "std". Link this new 3335 // namespace definition to the dummy namespace "std". 3336 StdNS->setNextNamespace(Namespc); 3337 StdNS->setLocation(IdentLoc); 3338 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3339 } 3340 3341 // Make our StdNamespace cache point at the first real definition of the 3342 // "std" namespace. 3343 StdNamespace = Namespc; 3344 } 3345 3346 PushOnScopeChains(Namespc, DeclRegionScope); 3347 } else { 3348 // Anonymous namespaces. 3349 assert(Namespc->isAnonymousNamespace()); 3350 3351 // Link the anonymous namespace into its parent. 3352 NamespaceDecl *PrevDecl; 3353 DeclContext *Parent = CurContext->getLookupContext(); 3354 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3355 PrevDecl = TU->getAnonymousNamespace(); 3356 TU->setAnonymousNamespace(Namespc); 3357 } else { 3358 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3359 PrevDecl = ND->getAnonymousNamespace(); 3360 ND->setAnonymousNamespace(Namespc); 3361 } 3362 3363 // Link the anonymous namespace with its previous declaration. 3364 if (PrevDecl) { 3365 assert(PrevDecl->isAnonymousNamespace()); 3366 assert(!PrevDecl->getNextNamespace()); 3367 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3368 PrevDecl->setNextNamespace(Namespc); 3369 } 3370 3371 CurContext->addDecl(Namespc); 3372 3373 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3374 // behaves as if it were replaced by 3375 // namespace unique { /* empty body */ } 3376 // using namespace unique; 3377 // namespace unique { namespace-body } 3378 // where all occurrences of 'unique' in a translation unit are 3379 // replaced by the same identifier and this identifier differs 3380 // from all other identifiers in the entire program. 3381 3382 // We just create the namespace with an empty name and then add an 3383 // implicit using declaration, just like the standard suggests. 3384 // 3385 // CodeGen enforces the "universally unique" aspect by giving all 3386 // declarations semantically contained within an anonymous 3387 // namespace internal linkage. 3388 3389 if (!PrevDecl) { 3390 UsingDirectiveDecl* UD 3391 = UsingDirectiveDecl::Create(Context, CurContext, 3392 /* 'using' */ LBrace, 3393 /* 'namespace' */ SourceLocation(), 3394 /* qualifier */ SourceRange(), 3395 /* NNS */ NULL, 3396 /* identifier */ SourceLocation(), 3397 Namespc, 3398 /* Ancestor */ CurContext); 3399 UD->setImplicit(); 3400 CurContext->addDecl(UD); 3401 } 3402 } 3403 3404 // Although we could have an invalid decl (i.e. the namespace name is a 3405 // redefinition), push it as current DeclContext and try to continue parsing. 3406 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3407 // for the namespace has the declarations that showed up in that particular 3408 // namespace definition. 3409 PushDeclContext(NamespcScope, Namespc); 3410 return DeclPtrTy::make(Namespc); 3411} 3412 3413/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3414/// is a namespace alias, returns the namespace it points to. 3415static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3416 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3417 return AD->getNamespace(); 3418 return dyn_cast_or_null<NamespaceDecl>(D); 3419} 3420 3421/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3422/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3423void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3424 Decl *Dcl = D.getAs<Decl>(); 3425 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3426 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3427 Namespc->setRBracLoc(RBrace); 3428 PopDeclContext(); 3429 if (Namespc->hasAttr<VisibilityAttr>()) 3430 PopPragmaVisibility(); 3431} 3432 3433/// \brief Retrieve the special "std" namespace, which may require us to 3434/// implicitly define the namespace. 3435NamespaceDecl *Sema::getOrCreateStdNamespace() { 3436 if (!StdNamespace) { 3437 // The "std" namespace has not yet been defined, so build one implicitly. 3438 StdNamespace = NamespaceDecl::Create(Context, 3439 Context.getTranslationUnitDecl(), 3440 SourceLocation(), 3441 &PP.getIdentifierTable().get("std")); 3442 getStdNamespace()->setImplicit(true); 3443 } 3444 3445 return getStdNamespace(); 3446} 3447 3448Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3449 SourceLocation UsingLoc, 3450 SourceLocation NamespcLoc, 3451 CXXScopeSpec &SS, 3452 SourceLocation IdentLoc, 3453 IdentifierInfo *NamespcName, 3454 AttributeList *AttrList) { 3455 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3456 assert(NamespcName && "Invalid NamespcName."); 3457 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3458 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3459 3460 UsingDirectiveDecl *UDir = 0; 3461 NestedNameSpecifier *Qualifier = 0; 3462 if (SS.isSet()) 3463 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3464 3465 // Lookup namespace name. 3466 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3467 LookupParsedName(R, S, &SS); 3468 if (R.isAmbiguous()) 3469 return DeclPtrTy(); 3470 3471 if (R.empty()) { 3472 // Allow "using namespace std;" or "using namespace ::std;" even if 3473 // "std" hasn't been defined yet, for GCC compatibility. 3474 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3475 NamespcName->isStr("std")) { 3476 Diag(IdentLoc, diag::ext_using_undefined_std); 3477 R.addDecl(getOrCreateStdNamespace()); 3478 R.resolveKind(); 3479 } 3480 // Otherwise, attempt typo correction. 3481 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3482 CTC_NoKeywords, 0)) { 3483 if (R.getAsSingle<NamespaceDecl>() || 3484 R.getAsSingle<NamespaceAliasDecl>()) { 3485 if (DeclContext *DC = computeDeclContext(SS, false)) 3486 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3487 << NamespcName << DC << Corrected << SS.getRange() 3488 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3489 else 3490 Diag(IdentLoc, diag::err_using_directive_suggest) 3491 << NamespcName << Corrected 3492 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3493 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3494 << Corrected; 3495 3496 NamespcName = Corrected.getAsIdentifierInfo(); 3497 } else { 3498 R.clear(); 3499 R.setLookupName(NamespcName); 3500 } 3501 } 3502 } 3503 3504 if (!R.empty()) { 3505 NamedDecl *Named = R.getFoundDecl(); 3506 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3507 && "expected namespace decl"); 3508 // C++ [namespace.udir]p1: 3509 // A using-directive specifies that the names in the nominated 3510 // namespace can be used in the scope in which the 3511 // using-directive appears after the using-directive. During 3512 // unqualified name lookup (3.4.1), the names appear as if they 3513 // were declared in the nearest enclosing namespace which 3514 // contains both the using-directive and the nominated 3515 // namespace. [Note: in this context, "contains" means "contains 3516 // directly or indirectly". ] 3517 3518 // Find enclosing context containing both using-directive and 3519 // nominated namespace. 3520 NamespaceDecl *NS = getNamespaceDecl(Named); 3521 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3522 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3523 CommonAncestor = CommonAncestor->getParent(); 3524 3525 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3526 SS.getRange(), 3527 (NestedNameSpecifier *)SS.getScopeRep(), 3528 IdentLoc, Named, CommonAncestor); 3529 PushUsingDirective(S, UDir); 3530 } else { 3531 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3532 } 3533 3534 // FIXME: We ignore attributes for now. 3535 delete AttrList; 3536 return DeclPtrTy::make(UDir); 3537} 3538 3539void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3540 // If scope has associated entity, then using directive is at namespace 3541 // or translation unit scope. We add UsingDirectiveDecls, into 3542 // it's lookup structure. 3543 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3544 Ctx->addDecl(UDir); 3545 else 3546 // Otherwise it is block-sope. using-directives will affect lookup 3547 // only to the end of scope. 3548 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3549} 3550 3551 3552Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3553 AccessSpecifier AS, 3554 bool HasUsingKeyword, 3555 SourceLocation UsingLoc, 3556 CXXScopeSpec &SS, 3557 UnqualifiedId &Name, 3558 AttributeList *AttrList, 3559 bool IsTypeName, 3560 SourceLocation TypenameLoc) { 3561 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3562 3563 switch (Name.getKind()) { 3564 case UnqualifiedId::IK_Identifier: 3565 case UnqualifiedId::IK_OperatorFunctionId: 3566 case UnqualifiedId::IK_LiteralOperatorId: 3567 case UnqualifiedId::IK_ConversionFunctionId: 3568 break; 3569 3570 case UnqualifiedId::IK_ConstructorName: 3571 case UnqualifiedId::IK_ConstructorTemplateId: 3572 // C++0x inherited constructors. 3573 if (getLangOptions().CPlusPlus0x) break; 3574 3575 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3576 << SS.getRange(); 3577 return DeclPtrTy(); 3578 3579 case UnqualifiedId::IK_DestructorName: 3580 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3581 << SS.getRange(); 3582 return DeclPtrTy(); 3583 3584 case UnqualifiedId::IK_TemplateId: 3585 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3586 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3587 return DeclPtrTy(); 3588 } 3589 3590 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3591 DeclarationName TargetName = TargetNameInfo.getName(); 3592 if (!TargetName) 3593 return DeclPtrTy(); 3594 3595 // Warn about using declarations. 3596 // TODO: store that the declaration was written without 'using' and 3597 // talk about access decls instead of using decls in the 3598 // diagnostics. 3599 if (!HasUsingKeyword) { 3600 UsingLoc = Name.getSourceRange().getBegin(); 3601 3602 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3603 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3604 } 3605 3606 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3607 TargetNameInfo, AttrList, 3608 /* IsInstantiation */ false, 3609 IsTypeName, TypenameLoc); 3610 if (UD) 3611 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3612 3613 return DeclPtrTy::make(UD); 3614} 3615 3616/// \brief Determine whether a using declaration considers the given 3617/// declarations as "equivalent", e.g., if they are redeclarations of 3618/// the same entity or are both typedefs of the same type. 3619static bool 3620IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3621 bool &SuppressRedeclaration) { 3622 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3623 SuppressRedeclaration = false; 3624 return true; 3625 } 3626 3627 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3628 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3629 SuppressRedeclaration = true; 3630 return Context.hasSameType(TD1->getUnderlyingType(), 3631 TD2->getUnderlyingType()); 3632 } 3633 3634 return false; 3635} 3636 3637 3638/// Determines whether to create a using shadow decl for a particular 3639/// decl, given the set of decls existing prior to this using lookup. 3640bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3641 const LookupResult &Previous) { 3642 // Diagnose finding a decl which is not from a base class of the 3643 // current class. We do this now because there are cases where this 3644 // function will silently decide not to build a shadow decl, which 3645 // will pre-empt further diagnostics. 3646 // 3647 // We don't need to do this in C++0x because we do the check once on 3648 // the qualifier. 3649 // 3650 // FIXME: diagnose the following if we care enough: 3651 // struct A { int foo; }; 3652 // struct B : A { using A::foo; }; 3653 // template <class T> struct C : A {}; 3654 // template <class T> struct D : C<T> { using B::foo; } // <--- 3655 // This is invalid (during instantiation) in C++03 because B::foo 3656 // resolves to the using decl in B, which is not a base class of D<T>. 3657 // We can't diagnose it immediately because C<T> is an unknown 3658 // specialization. The UsingShadowDecl in D<T> then points directly 3659 // to A::foo, which will look well-formed when we instantiate. 3660 // The right solution is to not collapse the shadow-decl chain. 3661 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3662 DeclContext *OrigDC = Orig->getDeclContext(); 3663 3664 // Handle enums and anonymous structs. 3665 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3666 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3667 while (OrigRec->isAnonymousStructOrUnion()) 3668 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3669 3670 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3671 if (OrigDC == CurContext) { 3672 Diag(Using->getLocation(), 3673 diag::err_using_decl_nested_name_specifier_is_current_class) 3674 << Using->getNestedNameRange(); 3675 Diag(Orig->getLocation(), diag::note_using_decl_target); 3676 return true; 3677 } 3678 3679 Diag(Using->getNestedNameRange().getBegin(), 3680 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3681 << Using->getTargetNestedNameDecl() 3682 << cast<CXXRecordDecl>(CurContext) 3683 << Using->getNestedNameRange(); 3684 Diag(Orig->getLocation(), diag::note_using_decl_target); 3685 return true; 3686 } 3687 } 3688 3689 if (Previous.empty()) return false; 3690 3691 NamedDecl *Target = Orig; 3692 if (isa<UsingShadowDecl>(Target)) 3693 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3694 3695 // If the target happens to be one of the previous declarations, we 3696 // don't have a conflict. 3697 // 3698 // FIXME: but we might be increasing its access, in which case we 3699 // should redeclare it. 3700 NamedDecl *NonTag = 0, *Tag = 0; 3701 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3702 I != E; ++I) { 3703 NamedDecl *D = (*I)->getUnderlyingDecl(); 3704 bool Result; 3705 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3706 return Result; 3707 3708 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3709 } 3710 3711 if (Target->isFunctionOrFunctionTemplate()) { 3712 FunctionDecl *FD; 3713 if (isa<FunctionTemplateDecl>(Target)) 3714 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3715 else 3716 FD = cast<FunctionDecl>(Target); 3717 3718 NamedDecl *OldDecl = 0; 3719 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3720 case Ovl_Overload: 3721 return false; 3722 3723 case Ovl_NonFunction: 3724 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3725 break; 3726 3727 // We found a decl with the exact signature. 3728 case Ovl_Match: 3729 // If we're in a record, we want to hide the target, so we 3730 // return true (without a diagnostic) to tell the caller not to 3731 // build a shadow decl. 3732 if (CurContext->isRecord()) 3733 return true; 3734 3735 // If we're not in a record, this is an error. 3736 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3737 break; 3738 } 3739 3740 Diag(Target->getLocation(), diag::note_using_decl_target); 3741 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3742 return true; 3743 } 3744 3745 // Target is not a function. 3746 3747 if (isa<TagDecl>(Target)) { 3748 // No conflict between a tag and a non-tag. 3749 if (!Tag) return false; 3750 3751 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3752 Diag(Target->getLocation(), diag::note_using_decl_target); 3753 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3754 return true; 3755 } 3756 3757 // No conflict between a tag and a non-tag. 3758 if (!NonTag) return false; 3759 3760 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3761 Diag(Target->getLocation(), diag::note_using_decl_target); 3762 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3763 return true; 3764} 3765 3766/// Builds a shadow declaration corresponding to a 'using' declaration. 3767UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3768 UsingDecl *UD, 3769 NamedDecl *Orig) { 3770 3771 // If we resolved to another shadow declaration, just coalesce them. 3772 NamedDecl *Target = Orig; 3773 if (isa<UsingShadowDecl>(Target)) { 3774 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3775 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3776 } 3777 3778 UsingShadowDecl *Shadow 3779 = UsingShadowDecl::Create(Context, CurContext, 3780 UD->getLocation(), UD, Target); 3781 UD->addShadowDecl(Shadow); 3782 3783 if (S) 3784 PushOnScopeChains(Shadow, S); 3785 else 3786 CurContext->addDecl(Shadow); 3787 Shadow->setAccess(UD->getAccess()); 3788 3789 // Register it as a conversion if appropriate. 3790 if (Shadow->getDeclName().getNameKind() 3791 == DeclarationName::CXXConversionFunctionName) 3792 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3793 3794 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3795 Shadow->setInvalidDecl(); 3796 3797 return Shadow; 3798} 3799 3800/// Hides a using shadow declaration. This is required by the current 3801/// using-decl implementation when a resolvable using declaration in a 3802/// class is followed by a declaration which would hide or override 3803/// one or more of the using decl's targets; for example: 3804/// 3805/// struct Base { void foo(int); }; 3806/// struct Derived : Base { 3807/// using Base::foo; 3808/// void foo(int); 3809/// }; 3810/// 3811/// The governing language is C++03 [namespace.udecl]p12: 3812/// 3813/// When a using-declaration brings names from a base class into a 3814/// derived class scope, member functions in the derived class 3815/// override and/or hide member functions with the same name and 3816/// parameter types in a base class (rather than conflicting). 3817/// 3818/// There are two ways to implement this: 3819/// (1) optimistically create shadow decls when they're not hidden 3820/// by existing declarations, or 3821/// (2) don't create any shadow decls (or at least don't make them 3822/// visible) until we've fully parsed/instantiated the class. 3823/// The problem with (1) is that we might have to retroactively remove 3824/// a shadow decl, which requires several O(n) operations because the 3825/// decl structures are (very reasonably) not designed for removal. 3826/// (2) avoids this but is very fiddly and phase-dependent. 3827void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3828 if (Shadow->getDeclName().getNameKind() == 3829 DeclarationName::CXXConversionFunctionName) 3830 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3831 3832 // Remove it from the DeclContext... 3833 Shadow->getDeclContext()->removeDecl(Shadow); 3834 3835 // ...and the scope, if applicable... 3836 if (S) { 3837 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3838 IdResolver.RemoveDecl(Shadow); 3839 } 3840 3841 // ...and the using decl. 3842 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3843 3844 // TODO: complain somehow if Shadow was used. It shouldn't 3845 // be possible for this to happen, because...? 3846} 3847 3848/// Builds a using declaration. 3849/// 3850/// \param IsInstantiation - Whether this call arises from an 3851/// instantiation of an unresolved using declaration. We treat 3852/// the lookup differently for these declarations. 3853NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3854 SourceLocation UsingLoc, 3855 CXXScopeSpec &SS, 3856 const DeclarationNameInfo &NameInfo, 3857 AttributeList *AttrList, 3858 bool IsInstantiation, 3859 bool IsTypeName, 3860 SourceLocation TypenameLoc) { 3861 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3862 SourceLocation IdentLoc = NameInfo.getLoc(); 3863 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3864 3865 // FIXME: We ignore attributes for now. 3866 delete AttrList; 3867 3868 if (SS.isEmpty()) { 3869 Diag(IdentLoc, diag::err_using_requires_qualname); 3870 return 0; 3871 } 3872 3873 // Do the redeclaration lookup in the current scope. 3874 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 3875 ForRedeclaration); 3876 Previous.setHideTags(false); 3877 if (S) { 3878 LookupName(Previous, S); 3879 3880 // It is really dumb that we have to do this. 3881 LookupResult::Filter F = Previous.makeFilter(); 3882 while (F.hasNext()) { 3883 NamedDecl *D = F.next(); 3884 if (!isDeclInScope(D, CurContext, S)) 3885 F.erase(); 3886 } 3887 F.done(); 3888 } else { 3889 assert(IsInstantiation && "no scope in non-instantiation"); 3890 assert(CurContext->isRecord() && "scope not record in instantiation"); 3891 LookupQualifiedName(Previous, CurContext); 3892 } 3893 3894 NestedNameSpecifier *NNS = 3895 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3896 3897 // Check for invalid redeclarations. 3898 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3899 return 0; 3900 3901 // Check for bad qualifiers. 3902 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3903 return 0; 3904 3905 DeclContext *LookupContext = computeDeclContext(SS); 3906 NamedDecl *D; 3907 if (!LookupContext) { 3908 if (IsTypeName) { 3909 // FIXME: not all declaration name kinds are legal here 3910 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3911 UsingLoc, TypenameLoc, 3912 SS.getRange(), NNS, 3913 IdentLoc, NameInfo.getName()); 3914 } else { 3915 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3916 UsingLoc, SS.getRange(), 3917 NNS, NameInfo); 3918 } 3919 } else { 3920 D = UsingDecl::Create(Context, CurContext, 3921 SS.getRange(), UsingLoc, NNS, NameInfo, 3922 IsTypeName); 3923 } 3924 D->setAccess(AS); 3925 CurContext->addDecl(D); 3926 3927 if (!LookupContext) return D; 3928 UsingDecl *UD = cast<UsingDecl>(D); 3929 3930 if (RequireCompleteDeclContext(SS, LookupContext)) { 3931 UD->setInvalidDecl(); 3932 return UD; 3933 } 3934 3935 // Look up the target name. 3936 3937 LookupResult R(*this, NameInfo, LookupOrdinaryName); 3938 3939 // Unlike most lookups, we don't always want to hide tag 3940 // declarations: tag names are visible through the using declaration 3941 // even if hidden by ordinary names, *except* in a dependent context 3942 // where it's important for the sanity of two-phase lookup. 3943 if (!IsInstantiation) 3944 R.setHideTags(false); 3945 3946 LookupQualifiedName(R, LookupContext); 3947 3948 if (R.empty()) { 3949 Diag(IdentLoc, diag::err_no_member) 3950 << NameInfo.getName() << LookupContext << SS.getRange(); 3951 UD->setInvalidDecl(); 3952 return UD; 3953 } 3954 3955 if (R.isAmbiguous()) { 3956 UD->setInvalidDecl(); 3957 return UD; 3958 } 3959 3960 if (IsTypeName) { 3961 // If we asked for a typename and got a non-type decl, error out. 3962 if (!R.getAsSingle<TypeDecl>()) { 3963 Diag(IdentLoc, diag::err_using_typename_non_type); 3964 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3965 Diag((*I)->getUnderlyingDecl()->getLocation(), 3966 diag::note_using_decl_target); 3967 UD->setInvalidDecl(); 3968 return UD; 3969 } 3970 } else { 3971 // If we asked for a non-typename and we got a type, error out, 3972 // but only if this is an instantiation of an unresolved using 3973 // decl. Otherwise just silently find the type name. 3974 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3975 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3976 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3977 UD->setInvalidDecl(); 3978 return UD; 3979 } 3980 } 3981 3982 // C++0x N2914 [namespace.udecl]p6: 3983 // A using-declaration shall not name a namespace. 3984 if (R.getAsSingle<NamespaceDecl>()) { 3985 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3986 << SS.getRange(); 3987 UD->setInvalidDecl(); 3988 return UD; 3989 } 3990 3991 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3992 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3993 BuildUsingShadowDecl(S, UD, *I); 3994 } 3995 3996 return UD; 3997} 3998 3999/// Checks that the given using declaration is not an invalid 4000/// redeclaration. Note that this is checking only for the using decl 4001/// itself, not for any ill-formedness among the UsingShadowDecls. 4002bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4003 bool isTypeName, 4004 const CXXScopeSpec &SS, 4005 SourceLocation NameLoc, 4006 const LookupResult &Prev) { 4007 // C++03 [namespace.udecl]p8: 4008 // C++0x [namespace.udecl]p10: 4009 // A using-declaration is a declaration and can therefore be used 4010 // repeatedly where (and only where) multiple declarations are 4011 // allowed. 4012 // 4013 // That's in non-member contexts. 4014 if (!CurContext->getLookupContext()->isRecord()) 4015 return false; 4016 4017 NestedNameSpecifier *Qual 4018 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4019 4020 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4021 NamedDecl *D = *I; 4022 4023 bool DTypename; 4024 NestedNameSpecifier *DQual; 4025 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4026 DTypename = UD->isTypeName(); 4027 DQual = UD->getTargetNestedNameDecl(); 4028 } else if (UnresolvedUsingValueDecl *UD 4029 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4030 DTypename = false; 4031 DQual = UD->getTargetNestedNameSpecifier(); 4032 } else if (UnresolvedUsingTypenameDecl *UD 4033 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4034 DTypename = true; 4035 DQual = UD->getTargetNestedNameSpecifier(); 4036 } else continue; 4037 4038 // using decls differ if one says 'typename' and the other doesn't. 4039 // FIXME: non-dependent using decls? 4040 if (isTypeName != DTypename) continue; 4041 4042 // using decls differ if they name different scopes (but note that 4043 // template instantiation can cause this check to trigger when it 4044 // didn't before instantiation). 4045 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4046 Context.getCanonicalNestedNameSpecifier(DQual)) 4047 continue; 4048 4049 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4050 Diag(D->getLocation(), diag::note_using_decl) << 1; 4051 return true; 4052 } 4053 4054 return false; 4055} 4056 4057 4058/// Checks that the given nested-name qualifier used in a using decl 4059/// in the current context is appropriately related to the current 4060/// scope. If an error is found, diagnoses it and returns true. 4061bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4062 const CXXScopeSpec &SS, 4063 SourceLocation NameLoc) { 4064 DeclContext *NamedContext = computeDeclContext(SS); 4065 4066 if (!CurContext->isRecord()) { 4067 // C++03 [namespace.udecl]p3: 4068 // C++0x [namespace.udecl]p8: 4069 // A using-declaration for a class member shall be a member-declaration. 4070 4071 // If we weren't able to compute a valid scope, it must be a 4072 // dependent class scope. 4073 if (!NamedContext || NamedContext->isRecord()) { 4074 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4075 << SS.getRange(); 4076 return true; 4077 } 4078 4079 // Otherwise, everything is known to be fine. 4080 return false; 4081 } 4082 4083 // The current scope is a record. 4084 4085 // If the named context is dependent, we can't decide much. 4086 if (!NamedContext) { 4087 // FIXME: in C++0x, we can diagnose if we can prove that the 4088 // nested-name-specifier does not refer to a base class, which is 4089 // still possible in some cases. 4090 4091 // Otherwise we have to conservatively report that things might be 4092 // okay. 4093 return false; 4094 } 4095 4096 if (!NamedContext->isRecord()) { 4097 // Ideally this would point at the last name in the specifier, 4098 // but we don't have that level of source info. 4099 Diag(SS.getRange().getBegin(), 4100 diag::err_using_decl_nested_name_specifier_is_not_class) 4101 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4102 return true; 4103 } 4104 4105 if (getLangOptions().CPlusPlus0x) { 4106 // C++0x [namespace.udecl]p3: 4107 // In a using-declaration used as a member-declaration, the 4108 // nested-name-specifier shall name a base class of the class 4109 // being defined. 4110 4111 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4112 cast<CXXRecordDecl>(NamedContext))) { 4113 if (CurContext == NamedContext) { 4114 Diag(NameLoc, 4115 diag::err_using_decl_nested_name_specifier_is_current_class) 4116 << SS.getRange(); 4117 return true; 4118 } 4119 4120 Diag(SS.getRange().getBegin(), 4121 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4122 << (NestedNameSpecifier*) SS.getScopeRep() 4123 << cast<CXXRecordDecl>(CurContext) 4124 << SS.getRange(); 4125 return true; 4126 } 4127 4128 return false; 4129 } 4130 4131 // C++03 [namespace.udecl]p4: 4132 // A using-declaration used as a member-declaration shall refer 4133 // to a member of a base class of the class being defined [etc.]. 4134 4135 // Salient point: SS doesn't have to name a base class as long as 4136 // lookup only finds members from base classes. Therefore we can 4137 // diagnose here only if we can prove that that can't happen, 4138 // i.e. if the class hierarchies provably don't intersect. 4139 4140 // TODO: it would be nice if "definitely valid" results were cached 4141 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4142 // need to be repeated. 4143 4144 struct UserData { 4145 llvm::DenseSet<const CXXRecordDecl*> Bases; 4146 4147 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4148 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4149 Data->Bases.insert(Base); 4150 return true; 4151 } 4152 4153 bool hasDependentBases(const CXXRecordDecl *Class) { 4154 return !Class->forallBases(collect, this); 4155 } 4156 4157 /// Returns true if the base is dependent or is one of the 4158 /// accumulated base classes. 4159 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4160 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4161 return !Data->Bases.count(Base); 4162 } 4163 4164 bool mightShareBases(const CXXRecordDecl *Class) { 4165 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4166 } 4167 }; 4168 4169 UserData Data; 4170 4171 // Returns false if we find a dependent base. 4172 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4173 return false; 4174 4175 // Returns false if the class has a dependent base or if it or one 4176 // of its bases is present in the base set of the current context. 4177 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4178 return false; 4179 4180 Diag(SS.getRange().getBegin(), 4181 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4182 << (NestedNameSpecifier*) SS.getScopeRep() 4183 << cast<CXXRecordDecl>(CurContext) 4184 << SS.getRange(); 4185 4186 return true; 4187} 4188 4189Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 4190 SourceLocation NamespaceLoc, 4191 SourceLocation AliasLoc, 4192 IdentifierInfo *Alias, 4193 CXXScopeSpec &SS, 4194 SourceLocation IdentLoc, 4195 IdentifierInfo *Ident) { 4196 4197 // Lookup the namespace name. 4198 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4199 LookupParsedName(R, S, &SS); 4200 4201 // Check if we have a previous declaration with the same name. 4202 NamedDecl *PrevDecl 4203 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4204 ForRedeclaration); 4205 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4206 PrevDecl = 0; 4207 4208 if (PrevDecl) { 4209 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4210 // We already have an alias with the same name that points to the same 4211 // namespace, so don't create a new one. 4212 // FIXME: At some point, we'll want to create the (redundant) 4213 // declaration to maintain better source information. 4214 if (!R.isAmbiguous() && !R.empty() && 4215 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4216 return DeclPtrTy(); 4217 } 4218 4219 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4220 diag::err_redefinition_different_kind; 4221 Diag(AliasLoc, DiagID) << Alias; 4222 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4223 return DeclPtrTy(); 4224 } 4225 4226 if (R.isAmbiguous()) 4227 return DeclPtrTy(); 4228 4229 if (R.empty()) { 4230 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4231 CTC_NoKeywords, 0)) { 4232 if (R.getAsSingle<NamespaceDecl>() || 4233 R.getAsSingle<NamespaceAliasDecl>()) { 4234 if (DeclContext *DC = computeDeclContext(SS, false)) 4235 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4236 << Ident << DC << Corrected << SS.getRange() 4237 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4238 else 4239 Diag(IdentLoc, diag::err_using_directive_suggest) 4240 << Ident << Corrected 4241 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4242 4243 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4244 << Corrected; 4245 4246 Ident = Corrected.getAsIdentifierInfo(); 4247 } else { 4248 R.clear(); 4249 R.setLookupName(Ident); 4250 } 4251 } 4252 4253 if (R.empty()) { 4254 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4255 return DeclPtrTy(); 4256 } 4257 } 4258 4259 NamespaceAliasDecl *AliasDecl = 4260 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4261 Alias, SS.getRange(), 4262 (NestedNameSpecifier *)SS.getScopeRep(), 4263 IdentLoc, R.getFoundDecl()); 4264 4265 PushOnScopeChains(AliasDecl, S); 4266 return DeclPtrTy::make(AliasDecl); 4267} 4268 4269namespace { 4270 /// \brief Scoped object used to handle the state changes required in Sema 4271 /// to implicitly define the body of a C++ member function; 4272 class ImplicitlyDefinedFunctionScope { 4273 Sema &S; 4274 DeclContext *PreviousContext; 4275 4276 public: 4277 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4278 : S(S), PreviousContext(S.CurContext) 4279 { 4280 S.CurContext = Method; 4281 S.PushFunctionScope(); 4282 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4283 } 4284 4285 ~ImplicitlyDefinedFunctionScope() { 4286 S.PopExpressionEvaluationContext(); 4287 S.PopFunctionOrBlockScope(); 4288 S.CurContext = PreviousContext; 4289 } 4290 }; 4291} 4292 4293CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4294 CXXRecordDecl *ClassDecl) { 4295 // C++ [class.ctor]p5: 4296 // A default constructor for a class X is a constructor of class X 4297 // that can be called without an argument. If there is no 4298 // user-declared constructor for class X, a default constructor is 4299 // implicitly declared. An implicitly-declared default constructor 4300 // is an inline public member of its class. 4301 assert(!ClassDecl->hasUserDeclaredConstructor() && 4302 "Should not build implicit default constructor!"); 4303 4304 // C++ [except.spec]p14: 4305 // An implicitly declared special member function (Clause 12) shall have an 4306 // exception-specification. [...] 4307 ImplicitExceptionSpecification ExceptSpec(Context); 4308 4309 // Direct base-class destructors. 4310 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4311 BEnd = ClassDecl->bases_end(); 4312 B != BEnd; ++B) { 4313 if (B->isVirtual()) // Handled below. 4314 continue; 4315 4316 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4317 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4318 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4319 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4320 else if (CXXConstructorDecl *Constructor 4321 = BaseClassDecl->getDefaultConstructor()) 4322 ExceptSpec.CalledDecl(Constructor); 4323 } 4324 } 4325 4326 // Virtual base-class destructors. 4327 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4328 BEnd = ClassDecl->vbases_end(); 4329 B != BEnd; ++B) { 4330 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4331 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4332 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4333 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4334 else if (CXXConstructorDecl *Constructor 4335 = BaseClassDecl->getDefaultConstructor()) 4336 ExceptSpec.CalledDecl(Constructor); 4337 } 4338 } 4339 4340 // Field destructors. 4341 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4342 FEnd = ClassDecl->field_end(); 4343 F != FEnd; ++F) { 4344 if (const RecordType *RecordTy 4345 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4346 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4347 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4348 ExceptSpec.CalledDecl( 4349 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4350 else if (CXXConstructorDecl *Constructor 4351 = FieldClassDecl->getDefaultConstructor()) 4352 ExceptSpec.CalledDecl(Constructor); 4353 } 4354 } 4355 4356 4357 // Create the actual constructor declaration. 4358 CanQualType ClassType 4359 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4360 DeclarationName Name 4361 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4362 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4363 CXXConstructorDecl *DefaultCon 4364 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 4365 Context.getFunctionType(Context.VoidTy, 4366 0, 0, false, 0, 4367 ExceptSpec.hasExceptionSpecification(), 4368 ExceptSpec.hasAnyExceptionSpecification(), 4369 ExceptSpec.size(), 4370 ExceptSpec.data(), 4371 FunctionType::ExtInfo()), 4372 /*TInfo=*/0, 4373 /*isExplicit=*/false, 4374 /*isInline=*/true, 4375 /*isImplicitlyDeclared=*/true); 4376 DefaultCon->setAccess(AS_public); 4377 DefaultCon->setImplicit(); 4378 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4379 4380 // Note that we have declared this constructor. 4381 ClassDecl->setDeclaredDefaultConstructor(true); 4382 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4383 4384 if (Scope *S = getScopeForContext(ClassDecl)) 4385 PushOnScopeChains(DefaultCon, S, false); 4386 ClassDecl->addDecl(DefaultCon); 4387 4388 return DefaultCon; 4389} 4390 4391void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4392 CXXConstructorDecl *Constructor) { 4393 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4394 !Constructor->isUsed(false)) && 4395 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4396 4397 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4398 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4399 4400 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4401 ErrorTrap Trap(*this); 4402 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4403 Trap.hasErrorOccurred()) { 4404 Diag(CurrentLocation, diag::note_member_synthesized_at) 4405 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4406 Constructor->setInvalidDecl(); 4407 } else { 4408 Constructor->setUsed(); 4409 MarkVTableUsed(CurrentLocation, ClassDecl); 4410 } 4411} 4412 4413CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4414 // C++ [class.dtor]p2: 4415 // If a class has no user-declared destructor, a destructor is 4416 // declared implicitly. An implicitly-declared destructor is an 4417 // inline public member of its class. 4418 4419 // C++ [except.spec]p14: 4420 // An implicitly declared special member function (Clause 12) shall have 4421 // an exception-specification. 4422 ImplicitExceptionSpecification ExceptSpec(Context); 4423 4424 // Direct base-class destructors. 4425 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4426 BEnd = ClassDecl->bases_end(); 4427 B != BEnd; ++B) { 4428 if (B->isVirtual()) // Handled below. 4429 continue; 4430 4431 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4432 ExceptSpec.CalledDecl( 4433 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4434 } 4435 4436 // Virtual base-class destructors. 4437 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4438 BEnd = ClassDecl->vbases_end(); 4439 B != BEnd; ++B) { 4440 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4441 ExceptSpec.CalledDecl( 4442 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4443 } 4444 4445 // Field destructors. 4446 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4447 FEnd = ClassDecl->field_end(); 4448 F != FEnd; ++F) { 4449 if (const RecordType *RecordTy 4450 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4451 ExceptSpec.CalledDecl( 4452 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4453 } 4454 4455 // Create the actual destructor declaration. 4456 QualType Ty = Context.getFunctionType(Context.VoidTy, 4457 0, 0, false, 0, 4458 ExceptSpec.hasExceptionSpecification(), 4459 ExceptSpec.hasAnyExceptionSpecification(), 4460 ExceptSpec.size(), 4461 ExceptSpec.data(), 4462 FunctionType::ExtInfo()); 4463 4464 CanQualType ClassType 4465 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4466 DeclarationName Name 4467 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4468 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4469 CXXDestructorDecl *Destructor 4470 = CXXDestructorDecl::Create(Context, ClassDecl, NameInfo, Ty, 4471 /*isInline=*/true, 4472 /*isImplicitlyDeclared=*/true); 4473 Destructor->setAccess(AS_public); 4474 Destructor->setImplicit(); 4475 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4476 4477 // Note that we have declared this destructor. 4478 ClassDecl->setDeclaredDestructor(true); 4479 ++ASTContext::NumImplicitDestructorsDeclared; 4480 4481 // Introduce this destructor into its scope. 4482 if (Scope *S = getScopeForContext(ClassDecl)) 4483 PushOnScopeChains(Destructor, S, false); 4484 ClassDecl->addDecl(Destructor); 4485 4486 // This could be uniqued if it ever proves significant. 4487 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4488 4489 AddOverriddenMethods(ClassDecl, Destructor); 4490 4491 return Destructor; 4492} 4493 4494void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4495 CXXDestructorDecl *Destructor) { 4496 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4497 "DefineImplicitDestructor - call it for implicit default dtor"); 4498 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4499 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4500 4501 if (Destructor->isInvalidDecl()) 4502 return; 4503 4504 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4505 4506 ErrorTrap Trap(*this); 4507 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4508 Destructor->getParent()); 4509 4510 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4511 Diag(CurrentLocation, diag::note_member_synthesized_at) 4512 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4513 4514 Destructor->setInvalidDecl(); 4515 return; 4516 } 4517 4518 Destructor->setUsed(); 4519 MarkVTableUsed(CurrentLocation, ClassDecl); 4520} 4521 4522/// \brief Builds a statement that copies the given entity from \p From to 4523/// \c To. 4524/// 4525/// This routine is used to copy the members of a class with an 4526/// implicitly-declared copy assignment operator. When the entities being 4527/// copied are arrays, this routine builds for loops to copy them. 4528/// 4529/// \param S The Sema object used for type-checking. 4530/// 4531/// \param Loc The location where the implicit copy is being generated. 4532/// 4533/// \param T The type of the expressions being copied. Both expressions must 4534/// have this type. 4535/// 4536/// \param To The expression we are copying to. 4537/// 4538/// \param From The expression we are copying from. 4539/// 4540/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4541/// Otherwise, it's a non-static member subobject. 4542/// 4543/// \param Depth Internal parameter recording the depth of the recursion. 4544/// 4545/// \returns A statement or a loop that copies the expressions. 4546static Sema::OwningStmtResult 4547BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4548 Sema::OwningExprResult To, Sema::OwningExprResult From, 4549 bool CopyingBaseSubobject, unsigned Depth = 0) { 4550 typedef Sema::OwningStmtResult OwningStmtResult; 4551 typedef Sema::OwningExprResult OwningExprResult; 4552 4553 // C++0x [class.copy]p30: 4554 // Each subobject is assigned in the manner appropriate to its type: 4555 // 4556 // - if the subobject is of class type, the copy assignment operator 4557 // for the class is used (as if by explicit qualification; that is, 4558 // ignoring any possible virtual overriding functions in more derived 4559 // classes); 4560 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4561 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4562 4563 // Look for operator=. 4564 DeclarationName Name 4565 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4566 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4567 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4568 4569 // Filter out any result that isn't a copy-assignment operator. 4570 LookupResult::Filter F = OpLookup.makeFilter(); 4571 while (F.hasNext()) { 4572 NamedDecl *D = F.next(); 4573 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4574 if (Method->isCopyAssignmentOperator()) 4575 continue; 4576 4577 F.erase(); 4578 } 4579 F.done(); 4580 4581 // Suppress the protected check (C++ [class.protected]) for each of the 4582 // assignment operators we found. This strange dance is required when 4583 // we're assigning via a base classes's copy-assignment operator. To 4584 // ensure that we're getting the right base class subobject (without 4585 // ambiguities), we need to cast "this" to that subobject type; to 4586 // ensure that we don't go through the virtual call mechanism, we need 4587 // to qualify the operator= name with the base class (see below). However, 4588 // this means that if the base class has a protected copy assignment 4589 // operator, the protected member access check will fail. So, we 4590 // rewrite "protected" access to "public" access in this case, since we 4591 // know by construction that we're calling from a derived class. 4592 if (CopyingBaseSubobject) { 4593 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4594 L != LEnd; ++L) { 4595 if (L.getAccess() == AS_protected) 4596 L.setAccess(AS_public); 4597 } 4598 } 4599 4600 // Create the nested-name-specifier that will be used to qualify the 4601 // reference to operator=; this is required to suppress the virtual 4602 // call mechanism. 4603 CXXScopeSpec SS; 4604 SS.setRange(Loc); 4605 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4606 T.getTypePtr())); 4607 4608 // Create the reference to operator=. 4609 OwningExprResult OpEqualRef 4610 = S.BuildMemberReferenceExpr(move(To), T, Loc, /*isArrow=*/false, SS, 4611 /*FirstQualifierInScope=*/0, OpLookup, 4612 /*TemplateArgs=*/0, 4613 /*SuppressQualifierCheck=*/true); 4614 if (OpEqualRef.isInvalid()) 4615 return S.StmtError(); 4616 4617 // Build the call to the assignment operator. 4618 Expr *FromE = From.takeAs<Expr>(); 4619 OwningExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4620 OpEqualRef.takeAs<Expr>(), 4621 Loc, &FromE, 1, 0, Loc); 4622 if (Call.isInvalid()) 4623 return S.StmtError(); 4624 4625 return S.Owned(Call.takeAs<Stmt>()); 4626 } 4627 4628 // - if the subobject is of scalar type, the built-in assignment 4629 // operator is used. 4630 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4631 if (!ArrayTy) { 4632 OwningExprResult Assignment = S.CreateBuiltinBinOp(Loc, 4633 BinaryOperator::Assign, 4634 To.takeAs<Expr>(), 4635 From.takeAs<Expr>()); 4636 if (Assignment.isInvalid()) 4637 return S.StmtError(); 4638 4639 return S.Owned(Assignment.takeAs<Stmt>()); 4640 } 4641 4642 // - if the subobject is an array, each element is assigned, in the 4643 // manner appropriate to the element type; 4644 4645 // Construct a loop over the array bounds, e.g., 4646 // 4647 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4648 // 4649 // that will copy each of the array elements. 4650 QualType SizeType = S.Context.getSizeType(); 4651 4652 // Create the iteration variable. 4653 IdentifierInfo *IterationVarName = 0; 4654 { 4655 llvm::SmallString<8> Str; 4656 llvm::raw_svector_ostream OS(Str); 4657 OS << "__i" << Depth; 4658 IterationVarName = &S.Context.Idents.get(OS.str()); 4659 } 4660 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4661 IterationVarName, SizeType, 4662 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4663 VarDecl::None, VarDecl::None); 4664 4665 // Initialize the iteration variable to zero. 4666 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4667 IterationVar->setInit(new (S.Context) IntegerLiteral(Zero, SizeType, Loc)); 4668 4669 // Create a reference to the iteration variable; we'll use this several 4670 // times throughout. 4671 Expr *IterationVarRef 4672 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4673 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4674 4675 // Create the DeclStmt that holds the iteration variable. 4676 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4677 4678 // Create the comparison against the array bound. 4679 llvm::APInt Upper = ArrayTy->getSize(); 4680 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4681 OwningExprResult Comparison 4682 = S.Owned(new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4683 new (S.Context) IntegerLiteral(Upper, SizeType, Loc), 4684 BinaryOperator::NE, S.Context.BoolTy, Loc)); 4685 4686 // Create the pre-increment of the iteration variable. 4687 OwningExprResult Increment 4688 = S.Owned(new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4689 UnaryOperator::PreInc, 4690 SizeType, Loc)); 4691 4692 // Subscript the "from" and "to" expressions with the iteration variable. 4693 From = S.CreateBuiltinArraySubscriptExpr(move(From), Loc, 4694 S.Owned(IterationVarRef->Retain()), 4695 Loc); 4696 To = S.CreateBuiltinArraySubscriptExpr(move(To), Loc, 4697 S.Owned(IterationVarRef->Retain()), 4698 Loc); 4699 assert(!From.isInvalid() && "Builtin subscripting can't fail!"); 4700 assert(!To.isInvalid() && "Builtin subscripting can't fail!"); 4701 4702 // Build the copy for an individual element of the array. 4703 OwningStmtResult Copy = BuildSingleCopyAssign(S, Loc, 4704 ArrayTy->getElementType(), 4705 move(To), move(From), 4706 CopyingBaseSubobject, Depth+1); 4707 if (Copy.isInvalid()) 4708 return S.StmtError(); 4709 4710 // Construct the loop that copies all elements of this array. 4711 return S.ActOnForStmt(Loc, Loc, S.Owned(InitStmt), 4712 S.MakeFullExpr(Comparison), 4713 Sema::DeclPtrTy(), 4714 S.MakeFullExpr(Increment), 4715 Loc, move(Copy)); 4716} 4717 4718/// \brief Determine whether the given class has a copy assignment operator 4719/// that accepts a const-qualified argument. 4720static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4721 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4722 4723 if (!Class->hasDeclaredCopyAssignment()) 4724 S.DeclareImplicitCopyAssignment(Class); 4725 4726 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4727 DeclarationName OpName 4728 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4729 4730 DeclContext::lookup_const_iterator Op, OpEnd; 4731 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4732 // C++ [class.copy]p9: 4733 // A user-declared copy assignment operator is a non-static non-template 4734 // member function of class X with exactly one parameter of type X, X&, 4735 // const X&, volatile X& or const volatile X&. 4736 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4737 if (!Method) 4738 continue; 4739 4740 if (Method->isStatic()) 4741 continue; 4742 if (Method->getPrimaryTemplate()) 4743 continue; 4744 const FunctionProtoType *FnType = 4745 Method->getType()->getAs<FunctionProtoType>(); 4746 assert(FnType && "Overloaded operator has no prototype."); 4747 // Don't assert on this; an invalid decl might have been left in the AST. 4748 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4749 continue; 4750 bool AcceptsConst = true; 4751 QualType ArgType = FnType->getArgType(0); 4752 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4753 ArgType = Ref->getPointeeType(); 4754 // Is it a non-const lvalue reference? 4755 if (!ArgType.isConstQualified()) 4756 AcceptsConst = false; 4757 } 4758 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4759 continue; 4760 4761 // We have a single argument of type cv X or cv X&, i.e. we've found the 4762 // copy assignment operator. Return whether it accepts const arguments. 4763 return AcceptsConst; 4764 } 4765 assert(Class->isInvalidDecl() && 4766 "No copy assignment operator declared in valid code."); 4767 return false; 4768} 4769 4770CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4771 // Note: The following rules are largely analoguous to the copy 4772 // constructor rules. Note that virtual bases are not taken into account 4773 // for determining the argument type of the operator. Note also that 4774 // operators taking an object instead of a reference are allowed. 4775 4776 4777 // C++ [class.copy]p10: 4778 // If the class definition does not explicitly declare a copy 4779 // assignment operator, one is declared implicitly. 4780 // The implicitly-defined copy assignment operator for a class X 4781 // will have the form 4782 // 4783 // X& X::operator=(const X&) 4784 // 4785 // if 4786 bool HasConstCopyAssignment = true; 4787 4788 // -- each direct base class B of X has a copy assignment operator 4789 // whose parameter is of type const B&, const volatile B& or B, 4790 // and 4791 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4792 BaseEnd = ClassDecl->bases_end(); 4793 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4794 assert(!Base->getType()->isDependentType() && 4795 "Cannot generate implicit members for class with dependent bases."); 4796 const CXXRecordDecl *BaseClassDecl 4797 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4798 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4799 } 4800 4801 // -- for all the nonstatic data members of X that are of a class 4802 // type M (or array thereof), each such class type has a copy 4803 // assignment operator whose parameter is of type const M&, 4804 // const volatile M& or M. 4805 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4806 FieldEnd = ClassDecl->field_end(); 4807 HasConstCopyAssignment && Field != FieldEnd; 4808 ++Field) { 4809 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4810 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4811 const CXXRecordDecl *FieldClassDecl 4812 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4813 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4814 } 4815 } 4816 4817 // Otherwise, the implicitly declared copy assignment operator will 4818 // have the form 4819 // 4820 // X& X::operator=(X&) 4821 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4822 QualType RetType = Context.getLValueReferenceType(ArgType); 4823 if (HasConstCopyAssignment) 4824 ArgType = ArgType.withConst(); 4825 ArgType = Context.getLValueReferenceType(ArgType); 4826 4827 // C++ [except.spec]p14: 4828 // An implicitly declared special member function (Clause 12) shall have an 4829 // exception-specification. [...] 4830 ImplicitExceptionSpecification ExceptSpec(Context); 4831 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4832 BaseEnd = ClassDecl->bases_end(); 4833 Base != BaseEnd; ++Base) { 4834 CXXRecordDecl *BaseClassDecl 4835 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4836 4837 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4838 DeclareImplicitCopyAssignment(BaseClassDecl); 4839 4840 if (CXXMethodDecl *CopyAssign 4841 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4842 ExceptSpec.CalledDecl(CopyAssign); 4843 } 4844 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4845 FieldEnd = ClassDecl->field_end(); 4846 Field != FieldEnd; 4847 ++Field) { 4848 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4849 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4850 CXXRecordDecl *FieldClassDecl 4851 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4852 4853 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 4854 DeclareImplicitCopyAssignment(FieldClassDecl); 4855 4856 if (CXXMethodDecl *CopyAssign 4857 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4858 ExceptSpec.CalledDecl(CopyAssign); 4859 } 4860 } 4861 4862 // An implicitly-declared copy assignment operator is an inline public 4863 // member of its class. 4864 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4865 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4866 CXXMethodDecl *CopyAssignment 4867 = CXXMethodDecl::Create(Context, ClassDecl, NameInfo, 4868 Context.getFunctionType(RetType, &ArgType, 1, 4869 false, 0, 4870 ExceptSpec.hasExceptionSpecification(), 4871 ExceptSpec.hasAnyExceptionSpecification(), 4872 ExceptSpec.size(), 4873 ExceptSpec.data(), 4874 FunctionType::ExtInfo()), 4875 /*TInfo=*/0, /*isStatic=*/false, 4876 /*StorageClassAsWritten=*/FunctionDecl::None, 4877 /*isInline=*/true); 4878 CopyAssignment->setAccess(AS_public); 4879 CopyAssignment->setImplicit(); 4880 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4881 CopyAssignment->setCopyAssignment(true); 4882 4883 // Add the parameter to the operator. 4884 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4885 ClassDecl->getLocation(), 4886 /*Id=*/0, 4887 ArgType, /*TInfo=*/0, 4888 VarDecl::None, 4889 VarDecl::None, 0); 4890 CopyAssignment->setParams(&FromParam, 1); 4891 4892 // Note that we have added this copy-assignment operator. 4893 ClassDecl->setDeclaredCopyAssignment(true); 4894 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 4895 4896 if (Scope *S = getScopeForContext(ClassDecl)) 4897 PushOnScopeChains(CopyAssignment, S, false); 4898 ClassDecl->addDecl(CopyAssignment); 4899 4900 AddOverriddenMethods(ClassDecl, CopyAssignment); 4901 return CopyAssignment; 4902} 4903 4904void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4905 CXXMethodDecl *CopyAssignOperator) { 4906 assert((CopyAssignOperator->isImplicit() && 4907 CopyAssignOperator->isOverloadedOperator() && 4908 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4909 !CopyAssignOperator->isUsed(false)) && 4910 "DefineImplicitCopyAssignment called for wrong function"); 4911 4912 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4913 4914 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4915 CopyAssignOperator->setInvalidDecl(); 4916 return; 4917 } 4918 4919 CopyAssignOperator->setUsed(); 4920 4921 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4922 ErrorTrap Trap(*this); 4923 4924 // C++0x [class.copy]p30: 4925 // The implicitly-defined or explicitly-defaulted copy assignment operator 4926 // for a non-union class X performs memberwise copy assignment of its 4927 // subobjects. The direct base classes of X are assigned first, in the 4928 // order of their declaration in the base-specifier-list, and then the 4929 // immediate non-static data members of X are assigned, in the order in 4930 // which they were declared in the class definition. 4931 4932 // The statements that form the synthesized function body. 4933 ASTOwningVector<&ActionBase::DeleteStmt> Statements(*this); 4934 4935 // The parameter for the "other" object, which we are copying from. 4936 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4937 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4938 QualType OtherRefType = Other->getType(); 4939 if (const LValueReferenceType *OtherRef 4940 = OtherRefType->getAs<LValueReferenceType>()) { 4941 OtherRefType = OtherRef->getPointeeType(); 4942 OtherQuals = OtherRefType.getQualifiers(); 4943 } 4944 4945 // Our location for everything implicitly-generated. 4946 SourceLocation Loc = CopyAssignOperator->getLocation(); 4947 4948 // Construct a reference to the "other" object. We'll be using this 4949 // throughout the generated ASTs. 4950 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4951 assert(OtherRef && "Reference to parameter cannot fail!"); 4952 4953 // Construct the "this" pointer. We'll be using this throughout the generated 4954 // ASTs. 4955 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4956 assert(This && "Reference to this cannot fail!"); 4957 4958 // Assign base classes. 4959 bool Invalid = false; 4960 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4961 E = ClassDecl->bases_end(); Base != E; ++Base) { 4962 // Form the assignment: 4963 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4964 QualType BaseType = Base->getType().getUnqualifiedType(); 4965 CXXRecordDecl *BaseClassDecl = 0; 4966 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4967 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4968 else { 4969 Invalid = true; 4970 continue; 4971 } 4972 4973 CXXCastPath BasePath; 4974 BasePath.push_back(Base); 4975 4976 // Construct the "from" expression, which is an implicit cast to the 4977 // appropriately-qualified base type. 4978 Expr *From = OtherRef->Retain(); 4979 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4980 CastExpr::CK_UncheckedDerivedToBase, 4981 ImplicitCastExpr::LValue, &BasePath); 4982 4983 // Dereference "this". 4984 OwningExprResult To = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4985 Owned(This->Retain())); 4986 4987 // Implicitly cast "this" to the appropriately-qualified base type. 4988 Expr *ToE = To.takeAs<Expr>(); 4989 ImpCastExprToType(ToE, 4990 Context.getCVRQualifiedType(BaseType, 4991 CopyAssignOperator->getTypeQualifiers()), 4992 CastExpr::CK_UncheckedDerivedToBase, 4993 ImplicitCastExpr::LValue, &BasePath); 4994 To = Owned(ToE); 4995 4996 // Build the copy. 4997 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4998 move(To), Owned(From), 4999 /*CopyingBaseSubobject=*/true); 5000 if (Copy.isInvalid()) { 5001 Diag(CurrentLocation, diag::note_member_synthesized_at) 5002 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5003 CopyAssignOperator->setInvalidDecl(); 5004 return; 5005 } 5006 5007 // Success! Record the copy. 5008 Statements.push_back(Copy.takeAs<Expr>()); 5009 } 5010 5011 // \brief Reference to the __builtin_memcpy function. 5012 Expr *BuiltinMemCpyRef = 0; 5013 // \brief Reference to the __builtin_objc_memmove_collectable function. 5014 Expr *CollectableMemCpyRef = 0; 5015 5016 // Assign non-static members. 5017 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5018 FieldEnd = ClassDecl->field_end(); 5019 Field != FieldEnd; ++Field) { 5020 // Check for members of reference type; we can't copy those. 5021 if (Field->getType()->isReferenceType()) { 5022 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5023 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5024 Diag(Field->getLocation(), diag::note_declared_at); 5025 Diag(CurrentLocation, diag::note_member_synthesized_at) 5026 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5027 Invalid = true; 5028 continue; 5029 } 5030 5031 // Check for members of const-qualified, non-class type. 5032 QualType BaseType = Context.getBaseElementType(Field->getType()); 5033 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5034 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5035 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5036 Diag(Field->getLocation(), diag::note_declared_at); 5037 Diag(CurrentLocation, diag::note_member_synthesized_at) 5038 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5039 Invalid = true; 5040 continue; 5041 } 5042 5043 QualType FieldType = Field->getType().getNonReferenceType(); 5044 if (FieldType->isIncompleteArrayType()) { 5045 assert(ClassDecl->hasFlexibleArrayMember() && 5046 "Incomplete array type is not valid"); 5047 continue; 5048 } 5049 5050 // Build references to the field in the object we're copying from and to. 5051 CXXScopeSpec SS; // Intentionally empty 5052 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5053 LookupMemberName); 5054 MemberLookup.addDecl(*Field); 5055 MemberLookup.resolveKind(); 5056 OwningExprResult From = BuildMemberReferenceExpr(Owned(OtherRef->Retain()), 5057 OtherRefType, 5058 Loc, /*IsArrow=*/false, 5059 SS, 0, MemberLookup, 0); 5060 OwningExprResult To = BuildMemberReferenceExpr(Owned(This->Retain()), 5061 This->getType(), 5062 Loc, /*IsArrow=*/true, 5063 SS, 0, MemberLookup, 0); 5064 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5065 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5066 5067 // If the field should be copied with __builtin_memcpy rather than via 5068 // explicit assignments, do so. This optimization only applies for arrays 5069 // of scalars and arrays of class type with trivial copy-assignment 5070 // operators. 5071 if (FieldType->isArrayType() && 5072 (!BaseType->isRecordType() || 5073 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5074 ->hasTrivialCopyAssignment())) { 5075 // Compute the size of the memory buffer to be copied. 5076 QualType SizeType = Context.getSizeType(); 5077 llvm::APInt Size(Context.getTypeSize(SizeType), 5078 Context.getTypeSizeInChars(BaseType).getQuantity()); 5079 for (const ConstantArrayType *Array 5080 = Context.getAsConstantArrayType(FieldType); 5081 Array; 5082 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5083 llvm::APInt ArraySize = Array->getSize(); 5084 ArraySize.zextOrTrunc(Size.getBitWidth()); 5085 Size *= ArraySize; 5086 } 5087 5088 // Take the address of the field references for "from" and "to". 5089 From = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(From)); 5090 To = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(To)); 5091 5092 bool NeedsCollectableMemCpy = 5093 (BaseType->isRecordType() && 5094 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5095 5096 if (NeedsCollectableMemCpy) { 5097 if (!CollectableMemCpyRef) { 5098 // Create a reference to the __builtin_objc_memmove_collectable function. 5099 LookupResult R(*this, 5100 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5101 Loc, LookupOrdinaryName); 5102 LookupName(R, TUScope, true); 5103 5104 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5105 if (!CollectableMemCpy) { 5106 // Something went horribly wrong earlier, and we will have 5107 // complained about it. 5108 Invalid = true; 5109 continue; 5110 } 5111 5112 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5113 CollectableMemCpy->getType(), 5114 Loc, 0).takeAs<Expr>(); 5115 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5116 } 5117 } 5118 // Create a reference to the __builtin_memcpy builtin function. 5119 else if (!BuiltinMemCpyRef) { 5120 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5121 LookupOrdinaryName); 5122 LookupName(R, TUScope, true); 5123 5124 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5125 if (!BuiltinMemCpy) { 5126 // Something went horribly wrong earlier, and we will have complained 5127 // about it. 5128 Invalid = true; 5129 continue; 5130 } 5131 5132 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5133 BuiltinMemCpy->getType(), 5134 Loc, 0).takeAs<Expr>(); 5135 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5136 } 5137 5138 ASTOwningVector<&ActionBase::DeleteExpr> CallArgs(*this); 5139 CallArgs.push_back(To.takeAs<Expr>()); 5140 CallArgs.push_back(From.takeAs<Expr>()); 5141 CallArgs.push_back(new (Context) IntegerLiteral(Size, SizeType, Loc)); 5142 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 5143 Commas.push_back(Loc); 5144 Commas.push_back(Loc); 5145 OwningExprResult Call = ExprError(); 5146 if (NeedsCollectableMemCpy) 5147 Call = ActOnCallExpr(/*Scope=*/0, 5148 Owned(CollectableMemCpyRef->Retain()), 5149 Loc, move_arg(CallArgs), 5150 Commas.data(), Loc); 5151 else 5152 Call = ActOnCallExpr(/*Scope=*/0, 5153 Owned(BuiltinMemCpyRef->Retain()), 5154 Loc, move_arg(CallArgs), 5155 Commas.data(), Loc); 5156 5157 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5158 Statements.push_back(Call.takeAs<Expr>()); 5159 continue; 5160 } 5161 5162 // Build the copy of this field. 5163 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5164 move(To), move(From), 5165 /*CopyingBaseSubobject=*/false); 5166 if (Copy.isInvalid()) { 5167 Diag(CurrentLocation, diag::note_member_synthesized_at) 5168 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5169 CopyAssignOperator->setInvalidDecl(); 5170 return; 5171 } 5172 5173 // Success! Record the copy. 5174 Statements.push_back(Copy.takeAs<Stmt>()); 5175 } 5176 5177 if (!Invalid) { 5178 // Add a "return *this;" 5179 OwningExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 5180 Owned(This->Retain())); 5181 5182 OwningStmtResult Return = ActOnReturnStmt(Loc, move(ThisObj)); 5183 if (Return.isInvalid()) 5184 Invalid = true; 5185 else { 5186 Statements.push_back(Return.takeAs<Stmt>()); 5187 5188 if (Trap.hasErrorOccurred()) { 5189 Diag(CurrentLocation, diag::note_member_synthesized_at) 5190 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5191 Invalid = true; 5192 } 5193 } 5194 } 5195 5196 if (Invalid) { 5197 CopyAssignOperator->setInvalidDecl(); 5198 return; 5199 } 5200 5201 OwningStmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5202 /*isStmtExpr=*/false); 5203 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5204 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5205} 5206 5207CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5208 CXXRecordDecl *ClassDecl) { 5209 // C++ [class.copy]p4: 5210 // If the class definition does not explicitly declare a copy 5211 // constructor, one is declared implicitly. 5212 5213 // C++ [class.copy]p5: 5214 // The implicitly-declared copy constructor for a class X will 5215 // have the form 5216 // 5217 // X::X(const X&) 5218 // 5219 // if 5220 bool HasConstCopyConstructor = true; 5221 5222 // -- each direct or virtual base class B of X has a copy 5223 // constructor whose first parameter is of type const B& or 5224 // const volatile B&, and 5225 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5226 BaseEnd = ClassDecl->bases_end(); 5227 HasConstCopyConstructor && Base != BaseEnd; 5228 ++Base) { 5229 // Virtual bases are handled below. 5230 if (Base->isVirtual()) 5231 continue; 5232 5233 CXXRecordDecl *BaseClassDecl 5234 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5235 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5236 DeclareImplicitCopyConstructor(BaseClassDecl); 5237 5238 HasConstCopyConstructor 5239 = BaseClassDecl->hasConstCopyConstructor(Context); 5240 } 5241 5242 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5243 BaseEnd = ClassDecl->vbases_end(); 5244 HasConstCopyConstructor && Base != BaseEnd; 5245 ++Base) { 5246 CXXRecordDecl *BaseClassDecl 5247 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5248 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5249 DeclareImplicitCopyConstructor(BaseClassDecl); 5250 5251 HasConstCopyConstructor 5252 = BaseClassDecl->hasConstCopyConstructor(Context); 5253 } 5254 5255 // -- for all the nonstatic data members of X that are of a 5256 // class type M (or array thereof), each such class type 5257 // has a copy constructor whose first parameter is of type 5258 // const M& or const volatile M&. 5259 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5260 FieldEnd = ClassDecl->field_end(); 5261 HasConstCopyConstructor && Field != FieldEnd; 5262 ++Field) { 5263 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5264 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5265 CXXRecordDecl *FieldClassDecl 5266 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5267 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5268 DeclareImplicitCopyConstructor(FieldClassDecl); 5269 5270 HasConstCopyConstructor 5271 = FieldClassDecl->hasConstCopyConstructor(Context); 5272 } 5273 } 5274 5275 // Otherwise, the implicitly declared copy constructor will have 5276 // the form 5277 // 5278 // X::X(X&) 5279 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5280 QualType ArgType = ClassType; 5281 if (HasConstCopyConstructor) 5282 ArgType = ArgType.withConst(); 5283 ArgType = Context.getLValueReferenceType(ArgType); 5284 5285 // C++ [except.spec]p14: 5286 // An implicitly declared special member function (Clause 12) shall have an 5287 // exception-specification. [...] 5288 ImplicitExceptionSpecification ExceptSpec(Context); 5289 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5290 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5291 BaseEnd = ClassDecl->bases_end(); 5292 Base != BaseEnd; 5293 ++Base) { 5294 // Virtual bases are handled below. 5295 if (Base->isVirtual()) 5296 continue; 5297 5298 CXXRecordDecl *BaseClassDecl 5299 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5300 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5301 DeclareImplicitCopyConstructor(BaseClassDecl); 5302 5303 if (CXXConstructorDecl *CopyConstructor 5304 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5305 ExceptSpec.CalledDecl(CopyConstructor); 5306 } 5307 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5308 BaseEnd = ClassDecl->vbases_end(); 5309 Base != BaseEnd; 5310 ++Base) { 5311 CXXRecordDecl *BaseClassDecl 5312 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5313 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5314 DeclareImplicitCopyConstructor(BaseClassDecl); 5315 5316 if (CXXConstructorDecl *CopyConstructor 5317 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5318 ExceptSpec.CalledDecl(CopyConstructor); 5319 } 5320 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5321 FieldEnd = ClassDecl->field_end(); 5322 Field != FieldEnd; 5323 ++Field) { 5324 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5325 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5326 CXXRecordDecl *FieldClassDecl 5327 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5328 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5329 DeclareImplicitCopyConstructor(FieldClassDecl); 5330 5331 if (CXXConstructorDecl *CopyConstructor 5332 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5333 ExceptSpec.CalledDecl(CopyConstructor); 5334 } 5335 } 5336 5337 // An implicitly-declared copy constructor is an inline public 5338 // member of its class. 5339 DeclarationName Name 5340 = Context.DeclarationNames.getCXXConstructorName( 5341 Context.getCanonicalType(ClassType)); 5342 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5343 CXXConstructorDecl *CopyConstructor 5344 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 5345 Context.getFunctionType(Context.VoidTy, 5346 &ArgType, 1, 5347 false, 0, 5348 ExceptSpec.hasExceptionSpecification(), 5349 ExceptSpec.hasAnyExceptionSpecification(), 5350 ExceptSpec.size(), 5351 ExceptSpec.data(), 5352 FunctionType::ExtInfo()), 5353 /*TInfo=*/0, 5354 /*isExplicit=*/false, 5355 /*isInline=*/true, 5356 /*isImplicitlyDeclared=*/true); 5357 CopyConstructor->setAccess(AS_public); 5358 CopyConstructor->setImplicit(); 5359 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5360 5361 // Note that we have declared this constructor. 5362 ClassDecl->setDeclaredCopyConstructor(true); 5363 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5364 5365 // Add the parameter to the constructor. 5366 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5367 ClassDecl->getLocation(), 5368 /*IdentifierInfo=*/0, 5369 ArgType, /*TInfo=*/0, 5370 VarDecl::None, 5371 VarDecl::None, 0); 5372 CopyConstructor->setParams(&FromParam, 1); 5373 if (Scope *S = getScopeForContext(ClassDecl)) 5374 PushOnScopeChains(CopyConstructor, S, false); 5375 ClassDecl->addDecl(CopyConstructor); 5376 5377 return CopyConstructor; 5378} 5379 5380void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5381 CXXConstructorDecl *CopyConstructor, 5382 unsigned TypeQuals) { 5383 assert((CopyConstructor->isImplicit() && 5384 CopyConstructor->isCopyConstructor(TypeQuals) && 5385 !CopyConstructor->isUsed(false)) && 5386 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5387 5388 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5389 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5390 5391 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5392 ErrorTrap Trap(*this); 5393 5394 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5395 Trap.hasErrorOccurred()) { 5396 Diag(CurrentLocation, diag::note_member_synthesized_at) 5397 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5398 CopyConstructor->setInvalidDecl(); 5399 } else { 5400 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5401 CopyConstructor->getLocation(), 5402 MultiStmtArg(*this, 0, 0), 5403 /*isStmtExpr=*/false) 5404 .takeAs<Stmt>()); 5405 } 5406 5407 CopyConstructor->setUsed(); 5408} 5409 5410Sema::OwningExprResult 5411Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5412 CXXConstructorDecl *Constructor, 5413 MultiExprArg ExprArgs, 5414 bool RequiresZeroInit, 5415 CXXConstructExpr::ConstructionKind ConstructKind) { 5416 bool Elidable = false; 5417 5418 // C++0x [class.copy]p34: 5419 // When certain criteria are met, an implementation is allowed to 5420 // omit the copy/move construction of a class object, even if the 5421 // copy/move constructor and/or destructor for the object have 5422 // side effects. [...] 5423 // - when a temporary class object that has not been bound to a 5424 // reference (12.2) would be copied/moved to a class object 5425 // with the same cv-unqualified type, the copy/move operation 5426 // can be omitted by constructing the temporary object 5427 // directly into the target of the omitted copy/move 5428 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5429 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5430 Elidable = SubExpr->isTemporaryObject() && 5431 Context.hasSameUnqualifiedType(SubExpr->getType(), 5432 Context.getTypeDeclType(Constructor->getParent())); 5433 } 5434 5435 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5436 Elidable, move(ExprArgs), RequiresZeroInit, 5437 ConstructKind); 5438} 5439 5440/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5441/// including handling of its default argument expressions. 5442Sema::OwningExprResult 5443Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5444 CXXConstructorDecl *Constructor, bool Elidable, 5445 MultiExprArg ExprArgs, 5446 bool RequiresZeroInit, 5447 CXXConstructExpr::ConstructionKind ConstructKind) { 5448 unsigned NumExprs = ExprArgs.size(); 5449 Expr **Exprs = (Expr **)ExprArgs.release(); 5450 5451 MarkDeclarationReferenced(ConstructLoc, Constructor); 5452 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5453 Constructor, Elidable, Exprs, NumExprs, 5454 RequiresZeroInit, ConstructKind)); 5455} 5456 5457bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5458 CXXConstructorDecl *Constructor, 5459 MultiExprArg Exprs) { 5460 OwningExprResult TempResult = 5461 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5462 move(Exprs)); 5463 if (TempResult.isInvalid()) 5464 return true; 5465 5466 Expr *Temp = TempResult.takeAs<Expr>(); 5467 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5468 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 5469 VD->setInit(Temp); 5470 5471 return false; 5472} 5473 5474void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5475 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5476 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5477 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5478 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5479 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5480 CheckDestructorAccess(VD->getLocation(), Destructor, 5481 PDiag(diag::err_access_dtor_var) 5482 << VD->getDeclName() 5483 << VD->getType()); 5484 5485 if (!VD->isInvalidDecl() && VD->hasGlobalStorage()) 5486 Diag(VD->getLocation(), diag::warn_global_destructor); 5487 } 5488} 5489 5490/// AddCXXDirectInitializerToDecl - This action is called immediately after 5491/// ActOnDeclarator, when a C++ direct initializer is present. 5492/// e.g: "int x(1);" 5493void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 5494 SourceLocation LParenLoc, 5495 MultiExprArg Exprs, 5496 SourceLocation *CommaLocs, 5497 SourceLocation RParenLoc) { 5498 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5499 Decl *RealDecl = Dcl.getAs<Decl>(); 5500 5501 // If there is no declaration, there was an error parsing it. Just ignore 5502 // the initializer. 5503 if (RealDecl == 0) 5504 return; 5505 5506 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5507 if (!VDecl) { 5508 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5509 RealDecl->setInvalidDecl(); 5510 return; 5511 } 5512 5513 // We will represent direct-initialization similarly to copy-initialization: 5514 // int x(1); -as-> int x = 1; 5515 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5516 // 5517 // Clients that want to distinguish between the two forms, can check for 5518 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5519 // A major benefit is that clients that don't particularly care about which 5520 // exactly form was it (like the CodeGen) can handle both cases without 5521 // special case code. 5522 5523 // C++ 8.5p11: 5524 // The form of initialization (using parentheses or '=') is generally 5525 // insignificant, but does matter when the entity being initialized has a 5526 // class type. 5527 5528 if (!VDecl->getType()->isDependentType() && 5529 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5530 diag::err_typecheck_decl_incomplete_type)) { 5531 VDecl->setInvalidDecl(); 5532 return; 5533 } 5534 5535 // The variable can not have an abstract class type. 5536 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5537 diag::err_abstract_type_in_decl, 5538 AbstractVariableType)) 5539 VDecl->setInvalidDecl(); 5540 5541 const VarDecl *Def; 5542 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5543 Diag(VDecl->getLocation(), diag::err_redefinition) 5544 << VDecl->getDeclName(); 5545 Diag(Def->getLocation(), diag::note_previous_definition); 5546 VDecl->setInvalidDecl(); 5547 return; 5548 } 5549 5550 // If either the declaration has a dependent type or if any of the 5551 // expressions is type-dependent, we represent the initialization 5552 // via a ParenListExpr for later use during template instantiation. 5553 if (VDecl->getType()->isDependentType() || 5554 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5555 // Let clients know that initialization was done with a direct initializer. 5556 VDecl->setCXXDirectInitializer(true); 5557 5558 // Store the initialization expressions as a ParenListExpr. 5559 unsigned NumExprs = Exprs.size(); 5560 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5561 (Expr **)Exprs.release(), 5562 NumExprs, RParenLoc)); 5563 return; 5564 } 5565 5566 // Capture the variable that is being initialized and the style of 5567 // initialization. 5568 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5569 5570 // FIXME: Poor source location information. 5571 InitializationKind Kind 5572 = InitializationKind::CreateDirect(VDecl->getLocation(), 5573 LParenLoc, RParenLoc); 5574 5575 InitializationSequence InitSeq(*this, Entity, Kind, 5576 (Expr**)Exprs.get(), Exprs.size()); 5577 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5578 if (Result.isInvalid()) { 5579 VDecl->setInvalidDecl(); 5580 return; 5581 } 5582 5583 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 5584 VDecl->setInit(Result.takeAs<Expr>()); 5585 VDecl->setCXXDirectInitializer(true); 5586 5587 if (!VDecl->isInvalidDecl() && 5588 !VDecl->getDeclContext()->isDependentContext() && 5589 VDecl->hasGlobalStorage() && 5590 !VDecl->getInit()->isConstantInitializer(Context, 5591 VDecl->getType()->isReferenceType())) 5592 Diag(VDecl->getLocation(), diag::warn_global_constructor) 5593 << VDecl->getInit()->getSourceRange(); 5594 5595 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5596 FinalizeVarWithDestructor(VDecl, Record); 5597} 5598 5599/// \brief Given a constructor and the set of arguments provided for the 5600/// constructor, convert the arguments and add any required default arguments 5601/// to form a proper call to this constructor. 5602/// 5603/// \returns true if an error occurred, false otherwise. 5604bool 5605Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5606 MultiExprArg ArgsPtr, 5607 SourceLocation Loc, 5608 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 5609 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5610 unsigned NumArgs = ArgsPtr.size(); 5611 Expr **Args = (Expr **)ArgsPtr.get(); 5612 5613 const FunctionProtoType *Proto 5614 = Constructor->getType()->getAs<FunctionProtoType>(); 5615 assert(Proto && "Constructor without a prototype?"); 5616 unsigned NumArgsInProto = Proto->getNumArgs(); 5617 5618 // If too few arguments are available, we'll fill in the rest with defaults. 5619 if (NumArgs < NumArgsInProto) 5620 ConvertedArgs.reserve(NumArgsInProto); 5621 else 5622 ConvertedArgs.reserve(NumArgs); 5623 5624 VariadicCallType CallType = 5625 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5626 llvm::SmallVector<Expr *, 8> AllArgs; 5627 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5628 Proto, 0, Args, NumArgs, AllArgs, 5629 CallType); 5630 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5631 ConvertedArgs.push_back(AllArgs[i]); 5632 return Invalid; 5633} 5634 5635static inline bool 5636CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5637 const FunctionDecl *FnDecl) { 5638 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 5639 if (isa<NamespaceDecl>(DC)) { 5640 return SemaRef.Diag(FnDecl->getLocation(), 5641 diag::err_operator_new_delete_declared_in_namespace) 5642 << FnDecl->getDeclName(); 5643 } 5644 5645 if (isa<TranslationUnitDecl>(DC) && 5646 FnDecl->getStorageClass() == FunctionDecl::Static) { 5647 return SemaRef.Diag(FnDecl->getLocation(), 5648 diag::err_operator_new_delete_declared_static) 5649 << FnDecl->getDeclName(); 5650 } 5651 5652 return false; 5653} 5654 5655static inline bool 5656CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5657 CanQualType ExpectedResultType, 5658 CanQualType ExpectedFirstParamType, 5659 unsigned DependentParamTypeDiag, 5660 unsigned InvalidParamTypeDiag) { 5661 QualType ResultType = 5662 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5663 5664 // Check that the result type is not dependent. 5665 if (ResultType->isDependentType()) 5666 return SemaRef.Diag(FnDecl->getLocation(), 5667 diag::err_operator_new_delete_dependent_result_type) 5668 << FnDecl->getDeclName() << ExpectedResultType; 5669 5670 // Check that the result type is what we expect. 5671 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5672 return SemaRef.Diag(FnDecl->getLocation(), 5673 diag::err_operator_new_delete_invalid_result_type) 5674 << FnDecl->getDeclName() << ExpectedResultType; 5675 5676 // A function template must have at least 2 parameters. 5677 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5678 return SemaRef.Diag(FnDecl->getLocation(), 5679 diag::err_operator_new_delete_template_too_few_parameters) 5680 << FnDecl->getDeclName(); 5681 5682 // The function decl must have at least 1 parameter. 5683 if (FnDecl->getNumParams() == 0) 5684 return SemaRef.Diag(FnDecl->getLocation(), 5685 diag::err_operator_new_delete_too_few_parameters) 5686 << FnDecl->getDeclName(); 5687 5688 // Check the the first parameter type is not dependent. 5689 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5690 if (FirstParamType->isDependentType()) 5691 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5692 << FnDecl->getDeclName() << ExpectedFirstParamType; 5693 5694 // Check that the first parameter type is what we expect. 5695 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5696 ExpectedFirstParamType) 5697 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5698 << FnDecl->getDeclName() << ExpectedFirstParamType; 5699 5700 return false; 5701} 5702 5703static bool 5704CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5705 // C++ [basic.stc.dynamic.allocation]p1: 5706 // A program is ill-formed if an allocation function is declared in a 5707 // namespace scope other than global scope or declared static in global 5708 // scope. 5709 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5710 return true; 5711 5712 CanQualType SizeTy = 5713 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5714 5715 // C++ [basic.stc.dynamic.allocation]p1: 5716 // The return type shall be void*. The first parameter shall have type 5717 // std::size_t. 5718 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5719 SizeTy, 5720 diag::err_operator_new_dependent_param_type, 5721 diag::err_operator_new_param_type)) 5722 return true; 5723 5724 // C++ [basic.stc.dynamic.allocation]p1: 5725 // The first parameter shall not have an associated default argument. 5726 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5727 return SemaRef.Diag(FnDecl->getLocation(), 5728 diag::err_operator_new_default_arg) 5729 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5730 5731 return false; 5732} 5733 5734static bool 5735CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5736 // C++ [basic.stc.dynamic.deallocation]p1: 5737 // A program is ill-formed if deallocation functions are declared in a 5738 // namespace scope other than global scope or declared static in global 5739 // scope. 5740 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5741 return true; 5742 5743 // C++ [basic.stc.dynamic.deallocation]p2: 5744 // Each deallocation function shall return void and its first parameter 5745 // shall be void*. 5746 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5747 SemaRef.Context.VoidPtrTy, 5748 diag::err_operator_delete_dependent_param_type, 5749 diag::err_operator_delete_param_type)) 5750 return true; 5751 5752 return false; 5753} 5754 5755/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5756/// of this overloaded operator is well-formed. If so, returns false; 5757/// otherwise, emits appropriate diagnostics and returns true. 5758bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5759 assert(FnDecl && FnDecl->isOverloadedOperator() && 5760 "Expected an overloaded operator declaration"); 5761 5762 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5763 5764 // C++ [over.oper]p5: 5765 // The allocation and deallocation functions, operator new, 5766 // operator new[], operator delete and operator delete[], are 5767 // described completely in 3.7.3. The attributes and restrictions 5768 // found in the rest of this subclause do not apply to them unless 5769 // explicitly stated in 3.7.3. 5770 if (Op == OO_Delete || Op == OO_Array_Delete) 5771 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5772 5773 if (Op == OO_New || Op == OO_Array_New) 5774 return CheckOperatorNewDeclaration(*this, FnDecl); 5775 5776 // C++ [over.oper]p6: 5777 // An operator function shall either be a non-static member 5778 // function or be a non-member function and have at least one 5779 // parameter whose type is a class, a reference to a class, an 5780 // enumeration, or a reference to an enumeration. 5781 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5782 if (MethodDecl->isStatic()) 5783 return Diag(FnDecl->getLocation(), 5784 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5785 } else { 5786 bool ClassOrEnumParam = false; 5787 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5788 ParamEnd = FnDecl->param_end(); 5789 Param != ParamEnd; ++Param) { 5790 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5791 if (ParamType->isDependentType() || ParamType->isRecordType() || 5792 ParamType->isEnumeralType()) { 5793 ClassOrEnumParam = true; 5794 break; 5795 } 5796 } 5797 5798 if (!ClassOrEnumParam) 5799 return Diag(FnDecl->getLocation(), 5800 diag::err_operator_overload_needs_class_or_enum) 5801 << FnDecl->getDeclName(); 5802 } 5803 5804 // C++ [over.oper]p8: 5805 // An operator function cannot have default arguments (8.3.6), 5806 // except where explicitly stated below. 5807 // 5808 // Only the function-call operator allows default arguments 5809 // (C++ [over.call]p1). 5810 if (Op != OO_Call) { 5811 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5812 Param != FnDecl->param_end(); ++Param) { 5813 if ((*Param)->hasDefaultArg()) 5814 return Diag((*Param)->getLocation(), 5815 diag::err_operator_overload_default_arg) 5816 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5817 } 5818 } 5819 5820 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5821 { false, false, false } 5822#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5823 , { Unary, Binary, MemberOnly } 5824#include "clang/Basic/OperatorKinds.def" 5825 }; 5826 5827 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5828 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5829 bool MustBeMemberOperator = OperatorUses[Op][2]; 5830 5831 // C++ [over.oper]p8: 5832 // [...] Operator functions cannot have more or fewer parameters 5833 // than the number required for the corresponding operator, as 5834 // described in the rest of this subclause. 5835 unsigned NumParams = FnDecl->getNumParams() 5836 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5837 if (Op != OO_Call && 5838 ((NumParams == 1 && !CanBeUnaryOperator) || 5839 (NumParams == 2 && !CanBeBinaryOperator) || 5840 (NumParams < 1) || (NumParams > 2))) { 5841 // We have the wrong number of parameters. 5842 unsigned ErrorKind; 5843 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5844 ErrorKind = 2; // 2 -> unary or binary. 5845 } else if (CanBeUnaryOperator) { 5846 ErrorKind = 0; // 0 -> unary 5847 } else { 5848 assert(CanBeBinaryOperator && 5849 "All non-call overloaded operators are unary or binary!"); 5850 ErrorKind = 1; // 1 -> binary 5851 } 5852 5853 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5854 << FnDecl->getDeclName() << NumParams << ErrorKind; 5855 } 5856 5857 // Overloaded operators other than operator() cannot be variadic. 5858 if (Op != OO_Call && 5859 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5860 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5861 << FnDecl->getDeclName(); 5862 } 5863 5864 // Some operators must be non-static member functions. 5865 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5866 return Diag(FnDecl->getLocation(), 5867 diag::err_operator_overload_must_be_member) 5868 << FnDecl->getDeclName(); 5869 } 5870 5871 // C++ [over.inc]p1: 5872 // The user-defined function called operator++ implements the 5873 // prefix and postfix ++ operator. If this function is a member 5874 // function with no parameters, or a non-member function with one 5875 // parameter of class or enumeration type, it defines the prefix 5876 // increment operator ++ for objects of that type. If the function 5877 // is a member function with one parameter (which shall be of type 5878 // int) or a non-member function with two parameters (the second 5879 // of which shall be of type int), it defines the postfix 5880 // increment operator ++ for objects of that type. 5881 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5882 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5883 bool ParamIsInt = false; 5884 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5885 ParamIsInt = BT->getKind() == BuiltinType::Int; 5886 5887 if (!ParamIsInt) 5888 return Diag(LastParam->getLocation(), 5889 diag::err_operator_overload_post_incdec_must_be_int) 5890 << LastParam->getType() << (Op == OO_MinusMinus); 5891 } 5892 5893 // Notify the class if it got an assignment operator. 5894 if (Op == OO_Equal) { 5895 // Would have returned earlier otherwise. 5896 assert(isa<CXXMethodDecl>(FnDecl) && 5897 "Overloaded = not member, but not filtered."); 5898 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5899 Method->getParent()->addedAssignmentOperator(Context, Method); 5900 } 5901 5902 return false; 5903} 5904 5905/// CheckLiteralOperatorDeclaration - Check whether the declaration 5906/// of this literal operator function is well-formed. If so, returns 5907/// false; otherwise, emits appropriate diagnostics and returns true. 5908bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5909 DeclContext *DC = FnDecl->getDeclContext(); 5910 Decl::Kind Kind = DC->getDeclKind(); 5911 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5912 Kind != Decl::LinkageSpec) { 5913 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5914 << FnDecl->getDeclName(); 5915 return true; 5916 } 5917 5918 bool Valid = false; 5919 5920 // template <char...> type operator "" name() is the only valid template 5921 // signature, and the only valid signature with no parameters. 5922 if (FnDecl->param_size() == 0) { 5923 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5924 // Must have only one template parameter 5925 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5926 if (Params->size() == 1) { 5927 NonTypeTemplateParmDecl *PmDecl = 5928 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5929 5930 // The template parameter must be a char parameter pack. 5931 // FIXME: This test will always fail because non-type parameter packs 5932 // have not been implemented. 5933 if (PmDecl && PmDecl->isTemplateParameterPack() && 5934 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5935 Valid = true; 5936 } 5937 } 5938 } else { 5939 // Check the first parameter 5940 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5941 5942 QualType T = (*Param)->getType(); 5943 5944 // unsigned long long int, long double, and any character type are allowed 5945 // as the only parameters. 5946 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5947 Context.hasSameType(T, Context.LongDoubleTy) || 5948 Context.hasSameType(T, Context.CharTy) || 5949 Context.hasSameType(T, Context.WCharTy) || 5950 Context.hasSameType(T, Context.Char16Ty) || 5951 Context.hasSameType(T, Context.Char32Ty)) { 5952 if (++Param == FnDecl->param_end()) 5953 Valid = true; 5954 goto FinishedParams; 5955 } 5956 5957 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5958 const PointerType *PT = T->getAs<PointerType>(); 5959 if (!PT) 5960 goto FinishedParams; 5961 T = PT->getPointeeType(); 5962 if (!T.isConstQualified()) 5963 goto FinishedParams; 5964 T = T.getUnqualifiedType(); 5965 5966 // Move on to the second parameter; 5967 ++Param; 5968 5969 // If there is no second parameter, the first must be a const char * 5970 if (Param == FnDecl->param_end()) { 5971 if (Context.hasSameType(T, Context.CharTy)) 5972 Valid = true; 5973 goto FinishedParams; 5974 } 5975 5976 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5977 // are allowed as the first parameter to a two-parameter function 5978 if (!(Context.hasSameType(T, Context.CharTy) || 5979 Context.hasSameType(T, Context.WCharTy) || 5980 Context.hasSameType(T, Context.Char16Ty) || 5981 Context.hasSameType(T, Context.Char32Ty))) 5982 goto FinishedParams; 5983 5984 // The second and final parameter must be an std::size_t 5985 T = (*Param)->getType().getUnqualifiedType(); 5986 if (Context.hasSameType(T, Context.getSizeType()) && 5987 ++Param == FnDecl->param_end()) 5988 Valid = true; 5989 } 5990 5991 // FIXME: This diagnostic is absolutely terrible. 5992FinishedParams: 5993 if (!Valid) { 5994 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5995 << FnDecl->getDeclName(); 5996 return true; 5997 } 5998 5999 return false; 6000} 6001 6002/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6003/// linkage specification, including the language and (if present) 6004/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6005/// the location of the language string literal, which is provided 6006/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6007/// the '{' brace. Otherwise, this linkage specification does not 6008/// have any braces. 6009Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 6010 SourceLocation ExternLoc, 6011 SourceLocation LangLoc, 6012 llvm::StringRef Lang, 6013 SourceLocation LBraceLoc) { 6014 LinkageSpecDecl::LanguageIDs Language; 6015 if (Lang == "\"C\"") 6016 Language = LinkageSpecDecl::lang_c; 6017 else if (Lang == "\"C++\"") 6018 Language = LinkageSpecDecl::lang_cxx; 6019 else { 6020 Diag(LangLoc, diag::err_bad_language); 6021 return DeclPtrTy(); 6022 } 6023 6024 // FIXME: Add all the various semantics of linkage specifications 6025 6026 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6027 LangLoc, Language, 6028 LBraceLoc.isValid()); 6029 CurContext->addDecl(D); 6030 PushDeclContext(S, D); 6031 return DeclPtrTy::make(D); 6032} 6033 6034/// ActOnFinishLinkageSpecification - Complete the definition of 6035/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6036/// valid, it's the position of the closing '}' brace in a linkage 6037/// specification that uses braces. 6038Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 6039 DeclPtrTy LinkageSpec, 6040 SourceLocation RBraceLoc) { 6041 if (LinkageSpec) 6042 PopDeclContext(); 6043 return LinkageSpec; 6044} 6045 6046/// \brief Perform semantic analysis for the variable declaration that 6047/// occurs within a C++ catch clause, returning the newly-created 6048/// variable. 6049VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 6050 TypeSourceInfo *TInfo, 6051 IdentifierInfo *Name, 6052 SourceLocation Loc, 6053 SourceRange Range) { 6054 bool Invalid = false; 6055 6056 // Arrays and functions decay. 6057 if (ExDeclType->isArrayType()) 6058 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6059 else if (ExDeclType->isFunctionType()) 6060 ExDeclType = Context.getPointerType(ExDeclType); 6061 6062 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6063 // The exception-declaration shall not denote a pointer or reference to an 6064 // incomplete type, other than [cv] void*. 6065 // N2844 forbids rvalue references. 6066 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6067 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 6068 Invalid = true; 6069 } 6070 6071 // GCC allows catching pointers and references to incomplete types 6072 // as an extension; so do we, but we warn by default. 6073 6074 QualType BaseType = ExDeclType; 6075 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6076 unsigned DK = diag::err_catch_incomplete; 6077 bool IncompleteCatchIsInvalid = true; 6078 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6079 BaseType = Ptr->getPointeeType(); 6080 Mode = 1; 6081 DK = diag::ext_catch_incomplete_ptr; 6082 IncompleteCatchIsInvalid = false; 6083 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6084 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6085 BaseType = Ref->getPointeeType(); 6086 Mode = 2; 6087 DK = diag::ext_catch_incomplete_ref; 6088 IncompleteCatchIsInvalid = false; 6089 } 6090 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6091 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6092 IncompleteCatchIsInvalid) 6093 Invalid = true; 6094 6095 if (!Invalid && !ExDeclType->isDependentType() && 6096 RequireNonAbstractType(Loc, ExDeclType, 6097 diag::err_abstract_type_in_decl, 6098 AbstractVariableType)) 6099 Invalid = true; 6100 6101 // Only the non-fragile NeXT runtime currently supports C++ catches 6102 // of ObjC types, and no runtime supports catching ObjC types by value. 6103 if (!Invalid && getLangOptions().ObjC1) { 6104 QualType T = ExDeclType; 6105 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6106 T = RT->getPointeeType(); 6107 6108 if (T->isObjCObjectType()) { 6109 Diag(Loc, diag::err_objc_object_catch); 6110 Invalid = true; 6111 } else if (T->isObjCObjectPointerType()) { 6112 if (!getLangOptions().NeXTRuntime) { 6113 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6114 Invalid = true; 6115 } else if (!getLangOptions().ObjCNonFragileABI) { 6116 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6117 Invalid = true; 6118 } 6119 } 6120 } 6121 6122 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6123 Name, ExDeclType, TInfo, VarDecl::None, 6124 VarDecl::None); 6125 ExDecl->setExceptionVariable(true); 6126 6127 if (!Invalid) { 6128 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6129 // C++ [except.handle]p16: 6130 // The object declared in an exception-declaration or, if the 6131 // exception-declaration does not specify a name, a temporary (12.2) is 6132 // copy-initialized (8.5) from the exception object. [...] 6133 // The object is destroyed when the handler exits, after the destruction 6134 // of any automatic objects initialized within the handler. 6135 // 6136 // We just pretend to initialize the object with itself, then make sure 6137 // it can be destroyed later. 6138 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6139 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6140 Loc, ExDeclType, 0); 6141 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6142 SourceLocation()); 6143 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6144 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6145 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 6146 if (Result.isInvalid()) 6147 Invalid = true; 6148 else 6149 FinalizeVarWithDestructor(ExDecl, RecordTy); 6150 } 6151 } 6152 6153 if (Invalid) 6154 ExDecl->setInvalidDecl(); 6155 6156 return ExDecl; 6157} 6158 6159/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6160/// handler. 6161Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6162 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6163 QualType ExDeclType = TInfo->getType(); 6164 6165 bool Invalid = D.isInvalidType(); 6166 IdentifierInfo *II = D.getIdentifier(); 6167 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6168 LookupOrdinaryName, 6169 ForRedeclaration)) { 6170 // The scope should be freshly made just for us. There is just no way 6171 // it contains any previous declaration. 6172 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 6173 if (PrevDecl->isTemplateParameter()) { 6174 // Maybe we will complain about the shadowed template parameter. 6175 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6176 } 6177 } 6178 6179 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6180 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6181 << D.getCXXScopeSpec().getRange(); 6182 Invalid = true; 6183 } 6184 6185 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 6186 D.getIdentifier(), 6187 D.getIdentifierLoc(), 6188 D.getDeclSpec().getSourceRange()); 6189 6190 if (Invalid) 6191 ExDecl->setInvalidDecl(); 6192 6193 // Add the exception declaration into this scope. 6194 if (II) 6195 PushOnScopeChains(ExDecl, S); 6196 else 6197 CurContext->addDecl(ExDecl); 6198 6199 ProcessDeclAttributes(S, ExDecl, D); 6200 return DeclPtrTy::make(ExDecl); 6201} 6202 6203Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6204 ExprArg assertexpr, 6205 ExprArg assertmessageexpr) { 6206 Expr *AssertExpr = (Expr *)assertexpr.get(); 6207 StringLiteral *AssertMessage = 6208 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 6209 6210 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6211 llvm::APSInt Value(32); 6212 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6213 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6214 AssertExpr->getSourceRange(); 6215 return DeclPtrTy(); 6216 } 6217 6218 if (Value == 0) { 6219 Diag(AssertLoc, diag::err_static_assert_failed) 6220 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6221 } 6222 } 6223 6224 assertexpr.release(); 6225 assertmessageexpr.release(); 6226 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6227 AssertExpr, AssertMessage); 6228 6229 CurContext->addDecl(Decl); 6230 return DeclPtrTy::make(Decl); 6231} 6232 6233/// \brief Perform semantic analysis of the given friend type declaration. 6234/// 6235/// \returns A friend declaration that. 6236FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6237 TypeSourceInfo *TSInfo) { 6238 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6239 6240 QualType T = TSInfo->getType(); 6241 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6242 6243 if (!getLangOptions().CPlusPlus0x) { 6244 // C++03 [class.friend]p2: 6245 // An elaborated-type-specifier shall be used in a friend declaration 6246 // for a class.* 6247 // 6248 // * The class-key of the elaborated-type-specifier is required. 6249 if (!ActiveTemplateInstantiations.empty()) { 6250 // Do not complain about the form of friend template types during 6251 // template instantiation; we will already have complained when the 6252 // template was declared. 6253 } else if (!T->isElaboratedTypeSpecifier()) { 6254 // If we evaluated the type to a record type, suggest putting 6255 // a tag in front. 6256 if (const RecordType *RT = T->getAs<RecordType>()) { 6257 RecordDecl *RD = RT->getDecl(); 6258 6259 std::string InsertionText = std::string(" ") + RD->getKindName(); 6260 6261 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6262 << (unsigned) RD->getTagKind() 6263 << T 6264 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6265 InsertionText); 6266 } else { 6267 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6268 << T 6269 << SourceRange(FriendLoc, TypeRange.getEnd()); 6270 } 6271 } else if (T->getAs<EnumType>()) { 6272 Diag(FriendLoc, diag::ext_enum_friend) 6273 << T 6274 << SourceRange(FriendLoc, TypeRange.getEnd()); 6275 } 6276 } 6277 6278 // C++0x [class.friend]p3: 6279 // If the type specifier in a friend declaration designates a (possibly 6280 // cv-qualified) class type, that class is declared as a friend; otherwise, 6281 // the friend declaration is ignored. 6282 6283 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6284 // in [class.friend]p3 that we do not implement. 6285 6286 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6287} 6288 6289/// Handle a friend type declaration. This works in tandem with 6290/// ActOnTag. 6291/// 6292/// Notes on friend class templates: 6293/// 6294/// We generally treat friend class declarations as if they were 6295/// declaring a class. So, for example, the elaborated type specifier 6296/// in a friend declaration is required to obey the restrictions of a 6297/// class-head (i.e. no typedefs in the scope chain), template 6298/// parameters are required to match up with simple template-ids, &c. 6299/// However, unlike when declaring a template specialization, it's 6300/// okay to refer to a template specialization without an empty 6301/// template parameter declaration, e.g. 6302/// friend class A<T>::B<unsigned>; 6303/// We permit this as a special case; if there are any template 6304/// parameters present at all, require proper matching, i.e. 6305/// template <> template <class T> friend class A<int>::B; 6306Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6307 MultiTemplateParamsArg TempParams) { 6308 SourceLocation Loc = DS.getSourceRange().getBegin(); 6309 6310 assert(DS.isFriendSpecified()); 6311 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6312 6313 // Try to convert the decl specifier to a type. This works for 6314 // friend templates because ActOnTag never produces a ClassTemplateDecl 6315 // for a TUK_Friend. 6316 Declarator TheDeclarator(DS, Declarator::MemberContext); 6317 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6318 QualType T = TSI->getType(); 6319 if (TheDeclarator.isInvalidType()) 6320 return DeclPtrTy(); 6321 6322 // This is definitely an error in C++98. It's probably meant to 6323 // be forbidden in C++0x, too, but the specification is just 6324 // poorly written. 6325 // 6326 // The problem is with declarations like the following: 6327 // template <T> friend A<T>::foo; 6328 // where deciding whether a class C is a friend or not now hinges 6329 // on whether there exists an instantiation of A that causes 6330 // 'foo' to equal C. There are restrictions on class-heads 6331 // (which we declare (by fiat) elaborated friend declarations to 6332 // be) that makes this tractable. 6333 // 6334 // FIXME: handle "template <> friend class A<T>;", which 6335 // is possibly well-formed? Who even knows? 6336 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6337 Diag(Loc, diag::err_tagless_friend_type_template) 6338 << DS.getSourceRange(); 6339 return DeclPtrTy(); 6340 } 6341 6342 // C++98 [class.friend]p1: A friend of a class is a function 6343 // or class that is not a member of the class . . . 6344 // This is fixed in DR77, which just barely didn't make the C++03 6345 // deadline. It's also a very silly restriction that seriously 6346 // affects inner classes and which nobody else seems to implement; 6347 // thus we never diagnose it, not even in -pedantic. 6348 // 6349 // But note that we could warn about it: it's always useless to 6350 // friend one of your own members (it's not, however, worthless to 6351 // friend a member of an arbitrary specialization of your template). 6352 6353 Decl *D; 6354 if (unsigned NumTempParamLists = TempParams.size()) 6355 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6356 NumTempParamLists, 6357 (TemplateParameterList**) TempParams.release(), 6358 TSI, 6359 DS.getFriendSpecLoc()); 6360 else 6361 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6362 6363 if (!D) 6364 return DeclPtrTy(); 6365 6366 D->setAccess(AS_public); 6367 CurContext->addDecl(D); 6368 6369 return DeclPtrTy::make(D); 6370} 6371 6372Sema::DeclPtrTy 6373Sema::ActOnFriendFunctionDecl(Scope *S, 6374 Declarator &D, 6375 bool IsDefinition, 6376 MultiTemplateParamsArg TemplateParams) { 6377 const DeclSpec &DS = D.getDeclSpec(); 6378 6379 assert(DS.isFriendSpecified()); 6380 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6381 6382 SourceLocation Loc = D.getIdentifierLoc(); 6383 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6384 QualType T = TInfo->getType(); 6385 6386 // C++ [class.friend]p1 6387 // A friend of a class is a function or class.... 6388 // Note that this sees through typedefs, which is intended. 6389 // It *doesn't* see through dependent types, which is correct 6390 // according to [temp.arg.type]p3: 6391 // If a declaration acquires a function type through a 6392 // type dependent on a template-parameter and this causes 6393 // a declaration that does not use the syntactic form of a 6394 // function declarator to have a function type, the program 6395 // is ill-formed. 6396 if (!T->isFunctionType()) { 6397 Diag(Loc, diag::err_unexpected_friend); 6398 6399 // It might be worthwhile to try to recover by creating an 6400 // appropriate declaration. 6401 return DeclPtrTy(); 6402 } 6403 6404 // C++ [namespace.memdef]p3 6405 // - If a friend declaration in a non-local class first declares a 6406 // class or function, the friend class or function is a member 6407 // of the innermost enclosing namespace. 6408 // - The name of the friend is not found by simple name lookup 6409 // until a matching declaration is provided in that namespace 6410 // scope (either before or after the class declaration granting 6411 // friendship). 6412 // - If a friend function is called, its name may be found by the 6413 // name lookup that considers functions from namespaces and 6414 // classes associated with the types of the function arguments. 6415 // - When looking for a prior declaration of a class or a function 6416 // declared as a friend, scopes outside the innermost enclosing 6417 // namespace scope are not considered. 6418 6419 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 6420 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 6421 DeclarationName Name = NameInfo.getName(); 6422 assert(Name); 6423 6424 // The context we found the declaration in, or in which we should 6425 // create the declaration. 6426 DeclContext *DC; 6427 6428 // FIXME: handle local classes 6429 6430 // Recover from invalid scope qualifiers as if they just weren't there. 6431 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 6432 ForRedeclaration); 6433 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 6434 DC = computeDeclContext(ScopeQual); 6435 6436 // FIXME: handle dependent contexts 6437 if (!DC) return DeclPtrTy(); 6438 if (RequireCompleteDeclContext(ScopeQual, DC)) return DeclPtrTy(); 6439 6440 LookupQualifiedName(Previous, DC); 6441 6442 // Ignore things found implicitly in the wrong scope. 6443 // TODO: better diagnostics for this case. Suggesting the right 6444 // qualified scope would be nice... 6445 LookupResult::Filter F = Previous.makeFilter(); 6446 while (F.hasNext()) { 6447 NamedDecl *D = F.next(); 6448 if (!D->getDeclContext()->getLookupContext()->Equals(DC)) 6449 F.erase(); 6450 } 6451 F.done(); 6452 6453 if (Previous.empty()) { 6454 D.setInvalidType(); 6455 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6456 return DeclPtrTy(); 6457 } 6458 6459 // C++ [class.friend]p1: A friend of a class is a function or 6460 // class that is not a member of the class . . . 6461 if (DC->Equals(CurContext)) 6462 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6463 6464 // Otherwise walk out to the nearest namespace scope looking for matches. 6465 } else { 6466 // TODO: handle local class contexts. 6467 6468 DC = CurContext; 6469 while (true) { 6470 // Skip class contexts. If someone can cite chapter and verse 6471 // for this behavior, that would be nice --- it's what GCC and 6472 // EDG do, and it seems like a reasonable intent, but the spec 6473 // really only says that checks for unqualified existing 6474 // declarations should stop at the nearest enclosing namespace, 6475 // not that they should only consider the nearest enclosing 6476 // namespace. 6477 while (DC->isRecord()) 6478 DC = DC->getParent(); 6479 6480 LookupQualifiedName(Previous, DC); 6481 6482 // TODO: decide what we think about using declarations. 6483 if (!Previous.empty()) 6484 break; 6485 6486 if (DC->isFileContext()) break; 6487 DC = DC->getParent(); 6488 } 6489 6490 // C++ [class.friend]p1: A friend of a class is a function or 6491 // class that is not a member of the class . . . 6492 // C++0x changes this for both friend types and functions. 6493 // Most C++ 98 compilers do seem to give an error here, so 6494 // we do, too. 6495 if (!Previous.empty() && DC->Equals(CurContext) 6496 && !getLangOptions().CPlusPlus0x) 6497 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6498 } 6499 6500 if (DC->isFileContext()) { 6501 // This implies that it has to be an operator or function. 6502 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6503 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6504 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6505 Diag(Loc, diag::err_introducing_special_friend) << 6506 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6507 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6508 return DeclPtrTy(); 6509 } 6510 } 6511 6512 bool Redeclaration = false; 6513 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 6514 move(TemplateParams), 6515 IsDefinition, 6516 Redeclaration); 6517 if (!ND) return DeclPtrTy(); 6518 6519 assert(ND->getDeclContext() == DC); 6520 assert(ND->getLexicalDeclContext() == CurContext); 6521 6522 // Add the function declaration to the appropriate lookup tables, 6523 // adjusting the redeclarations list as necessary. We don't 6524 // want to do this yet if the friending class is dependent. 6525 // 6526 // Also update the scope-based lookup if the target context's 6527 // lookup context is in lexical scope. 6528 if (!CurContext->isDependentContext()) { 6529 DC = DC->getLookupContext(); 6530 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6531 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6532 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6533 } 6534 6535 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6536 D.getIdentifierLoc(), ND, 6537 DS.getFriendSpecLoc()); 6538 FrD->setAccess(AS_public); 6539 CurContext->addDecl(FrD); 6540 6541 return DeclPtrTy::make(ND); 6542} 6543 6544void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 6545 AdjustDeclIfTemplate(dcl); 6546 6547 Decl *Dcl = dcl.getAs<Decl>(); 6548 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6549 if (!Fn) { 6550 Diag(DelLoc, diag::err_deleted_non_function); 6551 return; 6552 } 6553 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6554 Diag(DelLoc, diag::err_deleted_decl_not_first); 6555 Diag(Prev->getLocation(), diag::note_previous_declaration); 6556 // If the declaration wasn't the first, we delete the function anyway for 6557 // recovery. 6558 } 6559 Fn->setDeleted(); 6560} 6561 6562static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6563 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6564 ++CI) { 6565 Stmt *SubStmt = *CI; 6566 if (!SubStmt) 6567 continue; 6568 if (isa<ReturnStmt>(SubStmt)) 6569 Self.Diag(SubStmt->getSourceRange().getBegin(), 6570 diag::err_return_in_constructor_handler); 6571 if (!isa<Expr>(SubStmt)) 6572 SearchForReturnInStmt(Self, SubStmt); 6573 } 6574} 6575 6576void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6577 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6578 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6579 SearchForReturnInStmt(*this, Handler); 6580 } 6581} 6582 6583bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6584 const CXXMethodDecl *Old) { 6585 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6586 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6587 6588 if (Context.hasSameType(NewTy, OldTy) || 6589 NewTy->isDependentType() || OldTy->isDependentType()) 6590 return false; 6591 6592 // Check if the return types are covariant 6593 QualType NewClassTy, OldClassTy; 6594 6595 /// Both types must be pointers or references to classes. 6596 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6597 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6598 NewClassTy = NewPT->getPointeeType(); 6599 OldClassTy = OldPT->getPointeeType(); 6600 } 6601 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6602 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6603 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6604 NewClassTy = NewRT->getPointeeType(); 6605 OldClassTy = OldRT->getPointeeType(); 6606 } 6607 } 6608 } 6609 6610 // The return types aren't either both pointers or references to a class type. 6611 if (NewClassTy.isNull()) { 6612 Diag(New->getLocation(), 6613 diag::err_different_return_type_for_overriding_virtual_function) 6614 << New->getDeclName() << NewTy << OldTy; 6615 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6616 6617 return true; 6618 } 6619 6620 // C++ [class.virtual]p6: 6621 // If the return type of D::f differs from the return type of B::f, the 6622 // class type in the return type of D::f shall be complete at the point of 6623 // declaration of D::f or shall be the class type D. 6624 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6625 if (!RT->isBeingDefined() && 6626 RequireCompleteType(New->getLocation(), NewClassTy, 6627 PDiag(diag::err_covariant_return_incomplete) 6628 << New->getDeclName())) 6629 return true; 6630 } 6631 6632 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6633 // Check if the new class derives from the old class. 6634 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6635 Diag(New->getLocation(), 6636 diag::err_covariant_return_not_derived) 6637 << New->getDeclName() << NewTy << OldTy; 6638 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6639 return true; 6640 } 6641 6642 // Check if we the conversion from derived to base is valid. 6643 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6644 diag::err_covariant_return_inaccessible_base, 6645 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6646 // FIXME: Should this point to the return type? 6647 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6648 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6649 return true; 6650 } 6651 } 6652 6653 // The qualifiers of the return types must be the same. 6654 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6655 Diag(New->getLocation(), 6656 diag::err_covariant_return_type_different_qualifications) 6657 << New->getDeclName() << NewTy << OldTy; 6658 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6659 return true; 6660 }; 6661 6662 6663 // The new class type must have the same or less qualifiers as the old type. 6664 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6665 Diag(New->getLocation(), 6666 diag::err_covariant_return_type_class_type_more_qualified) 6667 << New->getDeclName() << NewTy << OldTy; 6668 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6669 return true; 6670 }; 6671 6672 return false; 6673} 6674 6675bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6676 const CXXMethodDecl *Old) 6677{ 6678 if (Old->hasAttr<FinalAttr>()) { 6679 Diag(New->getLocation(), diag::err_final_function_overridden) 6680 << New->getDeclName(); 6681 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6682 return true; 6683 } 6684 6685 return false; 6686} 6687 6688/// \brief Mark the given method pure. 6689/// 6690/// \param Method the method to be marked pure. 6691/// 6692/// \param InitRange the source range that covers the "0" initializer. 6693bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6694 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6695 Method->setPure(); 6696 6697 // A class is abstract if at least one function is pure virtual. 6698 Method->getParent()->setAbstract(true); 6699 return false; 6700 } 6701 6702 if (!Method->isInvalidDecl()) 6703 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6704 << Method->getDeclName() << InitRange; 6705 return true; 6706} 6707 6708/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6709/// an initializer for the out-of-line declaration 'Dcl'. The scope 6710/// is a fresh scope pushed for just this purpose. 6711/// 6712/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6713/// static data member of class X, names should be looked up in the scope of 6714/// class X. 6715void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6716 // If there is no declaration, there was an error parsing it. 6717 Decl *D = Dcl.getAs<Decl>(); 6718 if (D == 0) return; 6719 6720 // We should only get called for declarations with scope specifiers, like: 6721 // int foo::bar; 6722 assert(D->isOutOfLine()); 6723 EnterDeclaratorContext(S, D->getDeclContext()); 6724} 6725 6726/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6727/// initializer for the out-of-line declaration 'Dcl'. 6728void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6729 // If there is no declaration, there was an error parsing it. 6730 Decl *D = Dcl.getAs<Decl>(); 6731 if (D == 0) return; 6732 6733 assert(D->isOutOfLine()); 6734 ExitDeclaratorContext(S); 6735} 6736 6737/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6738/// C++ if/switch/while/for statement. 6739/// e.g: "if (int x = f()) {...}" 6740Action::DeclResult 6741Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6742 // C++ 6.4p2: 6743 // The declarator shall not specify a function or an array. 6744 // The type-specifier-seq shall not contain typedef and shall not declare a 6745 // new class or enumeration. 6746 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6747 "Parser allowed 'typedef' as storage class of condition decl."); 6748 6749 TagDecl *OwnedTag = 0; 6750 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6751 QualType Ty = TInfo->getType(); 6752 6753 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6754 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6755 // would be created and CXXConditionDeclExpr wants a VarDecl. 6756 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6757 << D.getSourceRange(); 6758 return DeclResult(); 6759 } else if (OwnedTag && OwnedTag->isDefinition()) { 6760 // The type-specifier-seq shall not declare a new class or enumeration. 6761 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6762 } 6763 6764 DeclPtrTy Dcl = ActOnDeclarator(S, D); 6765 if (!Dcl) 6766 return DeclResult(); 6767 6768 return Dcl; 6769} 6770 6771void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6772 bool DefinitionRequired) { 6773 // Ignore any vtable uses in unevaluated operands or for classes that do 6774 // not have a vtable. 6775 if (!Class->isDynamicClass() || Class->isDependentContext() || 6776 CurContext->isDependentContext() || 6777 ExprEvalContexts.back().Context == Unevaluated) 6778 return; 6779 6780 // Try to insert this class into the map. 6781 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6782 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6783 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6784 if (!Pos.second) { 6785 // If we already had an entry, check to see if we are promoting this vtable 6786 // to required a definition. If so, we need to reappend to the VTableUses 6787 // list, since we may have already processed the first entry. 6788 if (DefinitionRequired && !Pos.first->second) { 6789 Pos.first->second = true; 6790 } else { 6791 // Otherwise, we can early exit. 6792 return; 6793 } 6794 } 6795 6796 // Local classes need to have their virtual members marked 6797 // immediately. For all other classes, we mark their virtual members 6798 // at the end of the translation unit. 6799 if (Class->isLocalClass()) 6800 MarkVirtualMembersReferenced(Loc, Class); 6801 else 6802 VTableUses.push_back(std::make_pair(Class, Loc)); 6803} 6804 6805bool Sema::DefineUsedVTables() { 6806 // If any dynamic classes have their key function defined within 6807 // this translation unit, then those vtables are considered "used" and must 6808 // be emitted. 6809 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6810 if (const CXXMethodDecl *KeyFunction 6811 = Context.getKeyFunction(DynamicClasses[I])) { 6812 const FunctionDecl *Definition = 0; 6813 if (KeyFunction->hasBody(Definition)) 6814 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6815 } 6816 } 6817 6818 if (VTableUses.empty()) 6819 return false; 6820 6821 // Note: The VTableUses vector could grow as a result of marking 6822 // the members of a class as "used", so we check the size each 6823 // time through the loop and prefer indices (with are stable) to 6824 // iterators (which are not). 6825 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6826 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6827 if (!Class) 6828 continue; 6829 6830 SourceLocation Loc = VTableUses[I].second; 6831 6832 // If this class has a key function, but that key function is 6833 // defined in another translation unit, we don't need to emit the 6834 // vtable even though we're using it. 6835 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6836 if (KeyFunction && !KeyFunction->hasBody()) { 6837 switch (KeyFunction->getTemplateSpecializationKind()) { 6838 case TSK_Undeclared: 6839 case TSK_ExplicitSpecialization: 6840 case TSK_ExplicitInstantiationDeclaration: 6841 // The key function is in another translation unit. 6842 continue; 6843 6844 case TSK_ExplicitInstantiationDefinition: 6845 case TSK_ImplicitInstantiation: 6846 // We will be instantiating the key function. 6847 break; 6848 } 6849 } else if (!KeyFunction) { 6850 // If we have a class with no key function that is the subject 6851 // of an explicit instantiation declaration, suppress the 6852 // vtable; it will live with the explicit instantiation 6853 // definition. 6854 bool IsExplicitInstantiationDeclaration 6855 = Class->getTemplateSpecializationKind() 6856 == TSK_ExplicitInstantiationDeclaration; 6857 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6858 REnd = Class->redecls_end(); 6859 R != REnd; ++R) { 6860 TemplateSpecializationKind TSK 6861 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6862 if (TSK == TSK_ExplicitInstantiationDeclaration) 6863 IsExplicitInstantiationDeclaration = true; 6864 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6865 IsExplicitInstantiationDeclaration = false; 6866 break; 6867 } 6868 } 6869 6870 if (IsExplicitInstantiationDeclaration) 6871 continue; 6872 } 6873 6874 // Mark all of the virtual members of this class as referenced, so 6875 // that we can build a vtable. Then, tell the AST consumer that a 6876 // vtable for this class is required. 6877 MarkVirtualMembersReferenced(Loc, Class); 6878 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6879 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6880 6881 // Optionally warn if we're emitting a weak vtable. 6882 if (Class->getLinkage() == ExternalLinkage && 6883 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6884 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 6885 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6886 } 6887 } 6888 VTableUses.clear(); 6889 6890 return true; 6891} 6892 6893void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6894 const CXXRecordDecl *RD) { 6895 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6896 e = RD->method_end(); i != e; ++i) { 6897 CXXMethodDecl *MD = *i; 6898 6899 // C++ [basic.def.odr]p2: 6900 // [...] A virtual member function is used if it is not pure. [...] 6901 if (MD->isVirtual() && !MD->isPure()) 6902 MarkDeclarationReferenced(Loc, MD); 6903 } 6904 6905 // Only classes that have virtual bases need a VTT. 6906 if (RD->getNumVBases() == 0) 6907 return; 6908 6909 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6910 e = RD->bases_end(); i != e; ++i) { 6911 const CXXRecordDecl *Base = 6912 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6913 if (Base->getNumVBases() == 0) 6914 continue; 6915 MarkVirtualMembersReferenced(Loc, Base); 6916 } 6917} 6918 6919/// SetIvarInitializers - This routine builds initialization ASTs for the 6920/// Objective-C implementation whose ivars need be initialized. 6921void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6922 if (!getLangOptions().CPlusPlus) 6923 return; 6924 if (const ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6925 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6926 CollectIvarsToConstructOrDestruct(OID, ivars); 6927 if (ivars.empty()) 6928 return; 6929 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6930 for (unsigned i = 0; i < ivars.size(); i++) { 6931 FieldDecl *Field = ivars[i]; 6932 if (Field->isInvalidDecl()) 6933 continue; 6934 6935 CXXBaseOrMemberInitializer *Member; 6936 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6937 InitializationKind InitKind = 6938 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6939 6940 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6941 Sema::OwningExprResult MemberInit = 6942 InitSeq.Perform(*this, InitEntity, InitKind, 6943 Sema::MultiExprArg(*this, 0, 0)); 6944 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 6945 // Note, MemberInit could actually come back empty if no initialization 6946 // is required (e.g., because it would call a trivial default constructor) 6947 if (!MemberInit.get() || MemberInit.isInvalid()) 6948 continue; 6949 6950 Member = 6951 new (Context) CXXBaseOrMemberInitializer(Context, 6952 Field, SourceLocation(), 6953 SourceLocation(), 6954 MemberInit.takeAs<Expr>(), 6955 SourceLocation()); 6956 AllToInit.push_back(Member); 6957 6958 // Be sure that the destructor is accessible and is marked as referenced. 6959 if (const RecordType *RecordTy 6960 = Context.getBaseElementType(Field->getType()) 6961 ->getAs<RecordType>()) { 6962 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6963 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 6964 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6965 CheckDestructorAccess(Field->getLocation(), Destructor, 6966 PDiag(diag::err_access_dtor_ivar) 6967 << Context.getBaseElementType(Field->getType())); 6968 } 6969 } 6970 } 6971 ObjCImplementation->setIvarInitializers(Context, 6972 AllToInit.data(), AllToInit.size()); 6973 } 6974} 6975