SemaDeclCXX.cpp revision 6fb745bdf1ff1e32caf07e42093a7920726892c1
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/CharUnits.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/RecordLayout.h" 23#include "clang/AST/StmtVisitor.h" 24#include "clang/AST/TypeLoc.h" 25#include "clang/AST/TypeOrdering.h" 26#include "clang/Parse/DeclSpec.h" 27#include "clang/Parse/Template.h" 28#include "clang/Basic/PartialDiagnostic.h" 29#include "clang/Lex/Preprocessor.h" 30#include "llvm/ADT/STLExtras.h" 31#include <map> 32#include <set> 33 34using namespace clang; 35 36//===----------------------------------------------------------------------===// 37// CheckDefaultArgumentVisitor 38//===----------------------------------------------------------------------===// 39 40namespace { 41 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 42 /// the default argument of a parameter to determine whether it 43 /// contains any ill-formed subexpressions. For example, this will 44 /// diagnose the use of local variables or parameters within the 45 /// default argument expression. 46 class CheckDefaultArgumentVisitor 47 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 48 Expr *DefaultArg; 49 Sema *S; 50 51 public: 52 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 53 : DefaultArg(defarg), S(s) {} 54 55 bool VisitExpr(Expr *Node); 56 bool VisitDeclRefExpr(DeclRefExpr *DRE); 57 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 58 }; 59 60 /// VisitExpr - Visit all of the children of this expression. 61 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 62 bool IsInvalid = false; 63 for (Stmt::child_iterator I = Node->child_begin(), 64 E = Node->child_end(); I != E; ++I) 65 IsInvalid |= Visit(*I); 66 return IsInvalid; 67 } 68 69 /// VisitDeclRefExpr - Visit a reference to a declaration, to 70 /// determine whether this declaration can be used in the default 71 /// argument expression. 72 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 73 NamedDecl *Decl = DRE->getDecl(); 74 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 75 // C++ [dcl.fct.default]p9 76 // Default arguments are evaluated each time the function is 77 // called. The order of evaluation of function arguments is 78 // unspecified. Consequently, parameters of a function shall not 79 // be used in default argument expressions, even if they are not 80 // evaluated. Parameters of a function declared before a default 81 // argument expression are in scope and can hide namespace and 82 // class member names. 83 return S->Diag(DRE->getSourceRange().getBegin(), 84 diag::err_param_default_argument_references_param) 85 << Param->getDeclName() << DefaultArg->getSourceRange(); 86 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 87 // C++ [dcl.fct.default]p7 88 // Local variables shall not be used in default argument 89 // expressions. 90 if (VDecl->isBlockVarDecl()) 91 return S->Diag(DRE->getSourceRange().getBegin(), 92 diag::err_param_default_argument_references_local) 93 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 94 } 95 96 return false; 97 } 98 99 /// VisitCXXThisExpr - Visit a C++ "this" expression. 100 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 101 // C++ [dcl.fct.default]p8: 102 // The keyword this shall not be used in a default argument of a 103 // member function. 104 return S->Diag(ThisE->getSourceRange().getBegin(), 105 diag::err_param_default_argument_references_this) 106 << ThisE->getSourceRange(); 107 } 108} 109 110bool 111Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 112 SourceLocation EqualLoc) { 113 if (RequireCompleteType(Param->getLocation(), Param->getType(), 114 diag::err_typecheck_decl_incomplete_type)) { 115 Param->setInvalidDecl(); 116 return true; 117 } 118 119 Expr *Arg = (Expr *)DefaultArg.get(); 120 121 // C++ [dcl.fct.default]p5 122 // A default argument expression is implicitly converted (clause 123 // 4) to the parameter type. The default argument expression has 124 // the same semantic constraints as the initializer expression in 125 // a declaration of a variable of the parameter type, using the 126 // copy-initialization semantics (8.5). 127 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 128 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 129 EqualLoc); 130 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 131 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 132 MultiExprArg(*this, (void**)&Arg, 1)); 133 if (Result.isInvalid()) 134 return true; 135 Arg = Result.takeAs<Expr>(); 136 137 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 138 139 // Okay: add the default argument to the parameter 140 Param->setDefaultArg(Arg); 141 142 DefaultArg.release(); 143 144 return false; 145} 146 147/// ActOnParamDefaultArgument - Check whether the default argument 148/// provided for a function parameter is well-formed. If so, attach it 149/// to the parameter declaration. 150void 151Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 152 ExprArg defarg) { 153 if (!param || !defarg.get()) 154 return; 155 156 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 157 UnparsedDefaultArgLocs.erase(Param); 158 159 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 160 161 // Default arguments are only permitted in C++ 162 if (!getLangOptions().CPlusPlus) { 163 Diag(EqualLoc, diag::err_param_default_argument) 164 << DefaultArg->getSourceRange(); 165 Param->setInvalidDecl(); 166 return; 167 } 168 169 // Check that the default argument is well-formed 170 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 171 if (DefaultArgChecker.Visit(DefaultArg.get())) { 172 Param->setInvalidDecl(); 173 return; 174 } 175 176 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 177} 178 179/// ActOnParamUnparsedDefaultArgument - We've seen a default 180/// argument for a function parameter, but we can't parse it yet 181/// because we're inside a class definition. Note that this default 182/// argument will be parsed later. 183void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 184 SourceLocation EqualLoc, 185 SourceLocation ArgLoc) { 186 if (!param) 187 return; 188 189 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 190 if (Param) 191 Param->setUnparsedDefaultArg(); 192 193 UnparsedDefaultArgLocs[Param] = ArgLoc; 194} 195 196/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 197/// the default argument for the parameter param failed. 198void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 199 if (!param) 200 return; 201 202 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 203 204 Param->setInvalidDecl(); 205 206 UnparsedDefaultArgLocs.erase(Param); 207} 208 209/// CheckExtraCXXDefaultArguments - Check for any extra default 210/// arguments in the declarator, which is not a function declaration 211/// or definition and therefore is not permitted to have default 212/// arguments. This routine should be invoked for every declarator 213/// that is not a function declaration or definition. 214void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 215 // C++ [dcl.fct.default]p3 216 // A default argument expression shall be specified only in the 217 // parameter-declaration-clause of a function declaration or in a 218 // template-parameter (14.1). It shall not be specified for a 219 // parameter pack. If it is specified in a 220 // parameter-declaration-clause, it shall not occur within a 221 // declarator or abstract-declarator of a parameter-declaration. 222 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 223 DeclaratorChunk &chunk = D.getTypeObject(i); 224 if (chunk.Kind == DeclaratorChunk::Function) { 225 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 226 ParmVarDecl *Param = 227 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 228 if (Param->hasUnparsedDefaultArg()) { 229 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 230 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 231 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 232 delete Toks; 233 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 234 } else if (Param->getDefaultArg()) { 235 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 236 << Param->getDefaultArg()->getSourceRange(); 237 Param->setDefaultArg(0); 238 } 239 } 240 } 241 } 242} 243 244// MergeCXXFunctionDecl - Merge two declarations of the same C++ 245// function, once we already know that they have the same 246// type. Subroutine of MergeFunctionDecl. Returns true if there was an 247// error, false otherwise. 248bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 249 bool Invalid = false; 250 251 // C++ [dcl.fct.default]p4: 252 // For non-template functions, default arguments can be added in 253 // later declarations of a function in the same 254 // scope. Declarations in different scopes have completely 255 // distinct sets of default arguments. That is, declarations in 256 // inner scopes do not acquire default arguments from 257 // declarations in outer scopes, and vice versa. In a given 258 // function declaration, all parameters subsequent to a 259 // parameter with a default argument shall have default 260 // arguments supplied in this or previous declarations. A 261 // default argument shall not be redefined by a later 262 // declaration (not even to the same value). 263 // 264 // C++ [dcl.fct.default]p6: 265 // Except for member functions of class templates, the default arguments 266 // in a member function definition that appears outside of the class 267 // definition are added to the set of default arguments provided by the 268 // member function declaration in the class definition. 269 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 270 ParmVarDecl *OldParam = Old->getParamDecl(p); 271 ParmVarDecl *NewParam = New->getParamDecl(p); 272 273 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 274 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 275 // hint here. Alternatively, we could walk the type-source information 276 // for NewParam to find the last source location in the type... but it 277 // isn't worth the effort right now. This is the kind of test case that 278 // is hard to get right: 279 280 // int f(int); 281 // void g(int (*fp)(int) = f); 282 // void g(int (*fp)(int) = &f); 283 Diag(NewParam->getLocation(), 284 diag::err_param_default_argument_redefinition) 285 << NewParam->getDefaultArgRange(); 286 287 // Look for the function declaration where the default argument was 288 // actually written, which may be a declaration prior to Old. 289 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 290 Older; Older = Older->getPreviousDeclaration()) { 291 if (!Older->getParamDecl(p)->hasDefaultArg()) 292 break; 293 294 OldParam = Older->getParamDecl(p); 295 } 296 297 Diag(OldParam->getLocation(), diag::note_previous_definition) 298 << OldParam->getDefaultArgRange(); 299 Invalid = true; 300 } else if (OldParam->hasDefaultArg()) { 301 // Merge the old default argument into the new parameter. 302 // It's important to use getInit() here; getDefaultArg() 303 // strips off any top-level CXXExprWithTemporaries. 304 NewParam->setHasInheritedDefaultArg(); 305 if (OldParam->hasUninstantiatedDefaultArg()) 306 NewParam->setUninstantiatedDefaultArg( 307 OldParam->getUninstantiatedDefaultArg()); 308 else 309 NewParam->setDefaultArg(OldParam->getInit()); 310 } else if (NewParam->hasDefaultArg()) { 311 if (New->getDescribedFunctionTemplate()) { 312 // Paragraph 4, quoted above, only applies to non-template functions. 313 Diag(NewParam->getLocation(), 314 diag::err_param_default_argument_template_redecl) 315 << NewParam->getDefaultArgRange(); 316 Diag(Old->getLocation(), diag::note_template_prev_declaration) 317 << false; 318 } else if (New->getTemplateSpecializationKind() 319 != TSK_ImplicitInstantiation && 320 New->getTemplateSpecializationKind() != TSK_Undeclared) { 321 // C++ [temp.expr.spec]p21: 322 // Default function arguments shall not be specified in a declaration 323 // or a definition for one of the following explicit specializations: 324 // - the explicit specialization of a function template; 325 // - the explicit specialization of a member function template; 326 // - the explicit specialization of a member function of a class 327 // template where the class template specialization to which the 328 // member function specialization belongs is implicitly 329 // instantiated. 330 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 331 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 332 << New->getDeclName() 333 << NewParam->getDefaultArgRange(); 334 } else if (New->getDeclContext()->isDependentContext()) { 335 // C++ [dcl.fct.default]p6 (DR217): 336 // Default arguments for a member function of a class template shall 337 // be specified on the initial declaration of the member function 338 // within the class template. 339 // 340 // Reading the tea leaves a bit in DR217 and its reference to DR205 341 // leads me to the conclusion that one cannot add default function 342 // arguments for an out-of-line definition of a member function of a 343 // dependent type. 344 int WhichKind = 2; 345 if (CXXRecordDecl *Record 346 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 347 if (Record->getDescribedClassTemplate()) 348 WhichKind = 0; 349 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 350 WhichKind = 1; 351 else 352 WhichKind = 2; 353 } 354 355 Diag(NewParam->getLocation(), 356 diag::err_param_default_argument_member_template_redecl) 357 << WhichKind 358 << NewParam->getDefaultArgRange(); 359 } 360 } 361 } 362 363 if (CheckEquivalentExceptionSpec(Old, New)) 364 Invalid = true; 365 366 return Invalid; 367} 368 369/// CheckCXXDefaultArguments - Verify that the default arguments for a 370/// function declaration are well-formed according to C++ 371/// [dcl.fct.default]. 372void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 373 unsigned NumParams = FD->getNumParams(); 374 unsigned p; 375 376 // Find first parameter with a default argument 377 for (p = 0; p < NumParams; ++p) { 378 ParmVarDecl *Param = FD->getParamDecl(p); 379 if (Param->hasDefaultArg()) 380 break; 381 } 382 383 // C++ [dcl.fct.default]p4: 384 // In a given function declaration, all parameters 385 // subsequent to a parameter with a default argument shall 386 // have default arguments supplied in this or previous 387 // declarations. A default argument shall not be redefined 388 // by a later declaration (not even to the same value). 389 unsigned LastMissingDefaultArg = 0; 390 for (; p < NumParams; ++p) { 391 ParmVarDecl *Param = FD->getParamDecl(p); 392 if (!Param->hasDefaultArg()) { 393 if (Param->isInvalidDecl()) 394 /* We already complained about this parameter. */; 395 else if (Param->getIdentifier()) 396 Diag(Param->getLocation(), 397 diag::err_param_default_argument_missing_name) 398 << Param->getIdentifier(); 399 else 400 Diag(Param->getLocation(), 401 diag::err_param_default_argument_missing); 402 403 LastMissingDefaultArg = p; 404 } 405 } 406 407 if (LastMissingDefaultArg > 0) { 408 // Some default arguments were missing. Clear out all of the 409 // default arguments up to (and including) the last missing 410 // default argument, so that we leave the function parameters 411 // in a semantically valid state. 412 for (p = 0; p <= LastMissingDefaultArg; ++p) { 413 ParmVarDecl *Param = FD->getParamDecl(p); 414 if (Param->hasDefaultArg()) { 415 if (!Param->hasUnparsedDefaultArg()) 416 Param->getDefaultArg()->Destroy(Context); 417 Param->setDefaultArg(0); 418 } 419 } 420 } 421} 422 423/// isCurrentClassName - Determine whether the identifier II is the 424/// name of the class type currently being defined. In the case of 425/// nested classes, this will only return true if II is the name of 426/// the innermost class. 427bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 428 const CXXScopeSpec *SS) { 429 assert(getLangOptions().CPlusPlus && "No class names in C!"); 430 431 CXXRecordDecl *CurDecl; 432 if (SS && SS->isSet() && !SS->isInvalid()) { 433 DeclContext *DC = computeDeclContext(*SS, true); 434 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 435 } else 436 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 437 438 if (CurDecl && CurDecl->getIdentifier()) 439 return &II == CurDecl->getIdentifier(); 440 else 441 return false; 442} 443 444/// \brief Check the validity of a C++ base class specifier. 445/// 446/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 447/// and returns NULL otherwise. 448CXXBaseSpecifier * 449Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 450 SourceRange SpecifierRange, 451 bool Virtual, AccessSpecifier Access, 452 QualType BaseType, 453 SourceLocation BaseLoc) { 454 // C++ [class.union]p1: 455 // A union shall not have base classes. 456 if (Class->isUnion()) { 457 Diag(Class->getLocation(), diag::err_base_clause_on_union) 458 << SpecifierRange; 459 return 0; 460 } 461 462 if (BaseType->isDependentType()) 463 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 464 Class->getTagKind() == TTK_Class, 465 Access, BaseType); 466 467 // Base specifiers must be record types. 468 if (!BaseType->isRecordType()) { 469 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 470 return 0; 471 } 472 473 // C++ [class.union]p1: 474 // A union shall not be used as a base class. 475 if (BaseType->isUnionType()) { 476 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 477 return 0; 478 } 479 480 // C++ [class.derived]p2: 481 // The class-name in a base-specifier shall not be an incompletely 482 // defined class. 483 if (RequireCompleteType(BaseLoc, BaseType, 484 PDiag(diag::err_incomplete_base_class) 485 << SpecifierRange)) 486 return 0; 487 488 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 489 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 490 assert(BaseDecl && "Record type has no declaration"); 491 BaseDecl = BaseDecl->getDefinition(); 492 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 493 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 494 assert(CXXBaseDecl && "Base type is not a C++ type"); 495 496 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 497 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 498 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 499 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 500 << BaseType; 501 return 0; 502 } 503 504 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 505 506 // Create the base specifier. 507 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 508 Class->getTagKind() == TTK_Class, 509 Access, BaseType); 510} 511 512void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 513 const CXXRecordDecl *BaseClass, 514 bool BaseIsVirtual) { 515 // A class with a non-empty base class is not empty. 516 // FIXME: Standard ref? 517 if (!BaseClass->isEmpty()) 518 Class->setEmpty(false); 519 520 // C++ [class.virtual]p1: 521 // A class that [...] inherits a virtual function is called a polymorphic 522 // class. 523 if (BaseClass->isPolymorphic()) 524 Class->setPolymorphic(true); 525 526 // C++ [dcl.init.aggr]p1: 527 // An aggregate is [...] a class with [...] no base classes [...]. 528 Class->setAggregate(false); 529 530 // C++ [class]p4: 531 // A POD-struct is an aggregate class... 532 Class->setPOD(false); 533 534 if (BaseIsVirtual) { 535 // C++ [class.ctor]p5: 536 // A constructor is trivial if its class has no virtual base classes. 537 Class->setHasTrivialConstructor(false); 538 539 // C++ [class.copy]p6: 540 // A copy constructor is trivial if its class has no virtual base classes. 541 Class->setHasTrivialCopyConstructor(false); 542 543 // C++ [class.copy]p11: 544 // A copy assignment operator is trivial if its class has no virtual 545 // base classes. 546 Class->setHasTrivialCopyAssignment(false); 547 548 // C++0x [meta.unary.prop] is_empty: 549 // T is a class type, but not a union type, with ... no virtual base 550 // classes 551 Class->setEmpty(false); 552 } else { 553 // C++ [class.ctor]p5: 554 // A constructor is trivial if all the direct base classes of its 555 // class have trivial constructors. 556 if (!BaseClass->hasTrivialConstructor()) 557 Class->setHasTrivialConstructor(false); 558 559 // C++ [class.copy]p6: 560 // A copy constructor is trivial if all the direct base classes of its 561 // class have trivial copy constructors. 562 if (!BaseClass->hasTrivialCopyConstructor()) 563 Class->setHasTrivialCopyConstructor(false); 564 565 // C++ [class.copy]p11: 566 // A copy assignment operator is trivial if all the direct base classes 567 // of its class have trivial copy assignment operators. 568 if (!BaseClass->hasTrivialCopyAssignment()) 569 Class->setHasTrivialCopyAssignment(false); 570 } 571 572 // C++ [class.ctor]p3: 573 // A destructor is trivial if all the direct base classes of its class 574 // have trivial destructors. 575 if (!BaseClass->hasTrivialDestructor()) 576 Class->setHasTrivialDestructor(false); 577} 578 579/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 580/// one entry in the base class list of a class specifier, for 581/// example: 582/// class foo : public bar, virtual private baz { 583/// 'public bar' and 'virtual private baz' are each base-specifiers. 584Sema::BaseResult 585Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 586 bool Virtual, AccessSpecifier Access, 587 TypeTy *basetype, SourceLocation BaseLoc) { 588 if (!classdecl) 589 return true; 590 591 AdjustDeclIfTemplate(classdecl); 592 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 593 if (!Class) 594 return true; 595 596 QualType BaseType = GetTypeFromParser(basetype); 597 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 598 Virtual, Access, 599 BaseType, BaseLoc)) 600 return BaseSpec; 601 602 return true; 603} 604 605/// \brief Performs the actual work of attaching the given base class 606/// specifiers to a C++ class. 607bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 608 unsigned NumBases) { 609 if (NumBases == 0) 610 return false; 611 612 // Used to keep track of which base types we have already seen, so 613 // that we can properly diagnose redundant direct base types. Note 614 // that the key is always the unqualified canonical type of the base 615 // class. 616 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 617 618 // Copy non-redundant base specifiers into permanent storage. 619 unsigned NumGoodBases = 0; 620 bool Invalid = false; 621 for (unsigned idx = 0; idx < NumBases; ++idx) { 622 QualType NewBaseType 623 = Context.getCanonicalType(Bases[idx]->getType()); 624 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 625 626 if (KnownBaseTypes[NewBaseType]) { 627 // C++ [class.mi]p3: 628 // A class shall not be specified as a direct base class of a 629 // derived class more than once. 630 Diag(Bases[idx]->getSourceRange().getBegin(), 631 diag::err_duplicate_base_class) 632 << KnownBaseTypes[NewBaseType]->getType() 633 << Bases[idx]->getSourceRange(); 634 635 // Delete the duplicate base class specifier; we're going to 636 // overwrite its pointer later. 637 Context.Deallocate(Bases[idx]); 638 639 Invalid = true; 640 } else { 641 // Okay, add this new base class. 642 KnownBaseTypes[NewBaseType] = Bases[idx]; 643 Bases[NumGoodBases++] = Bases[idx]; 644 } 645 } 646 647 // Attach the remaining base class specifiers to the derived class. 648 Class->setBases(Bases, NumGoodBases); 649 650 // Delete the remaining (good) base class specifiers, since their 651 // data has been copied into the CXXRecordDecl. 652 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 653 Context.Deallocate(Bases[idx]); 654 655 return Invalid; 656} 657 658/// ActOnBaseSpecifiers - Attach the given base specifiers to the 659/// class, after checking whether there are any duplicate base 660/// classes. 661void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 662 unsigned NumBases) { 663 if (!ClassDecl || !Bases || !NumBases) 664 return; 665 666 AdjustDeclIfTemplate(ClassDecl); 667 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 668 (CXXBaseSpecifier**)(Bases), NumBases); 669} 670 671static CXXRecordDecl *GetClassForType(QualType T) { 672 if (const RecordType *RT = T->getAs<RecordType>()) 673 return cast<CXXRecordDecl>(RT->getDecl()); 674 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 675 return ICT->getDecl(); 676 else 677 return 0; 678} 679 680/// \brief Determine whether the type \p Derived is a C++ class that is 681/// derived from the type \p Base. 682bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 683 if (!getLangOptions().CPlusPlus) 684 return false; 685 686 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 687 if (!DerivedRD) 688 return false; 689 690 CXXRecordDecl *BaseRD = GetClassForType(Base); 691 if (!BaseRD) 692 return false; 693 694 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 695 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 696} 697 698/// \brief Determine whether the type \p Derived is a C++ class that is 699/// derived from the type \p Base. 700bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 701 if (!getLangOptions().CPlusPlus) 702 return false; 703 704 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 705 if (!DerivedRD) 706 return false; 707 708 CXXRecordDecl *BaseRD = GetClassForType(Base); 709 if (!BaseRD) 710 return false; 711 712 return DerivedRD->isDerivedFrom(BaseRD, Paths); 713} 714 715void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 716 CXXBaseSpecifierArray &BasePathArray) { 717 assert(BasePathArray.empty() && "Base path array must be empty!"); 718 assert(Paths.isRecordingPaths() && "Must record paths!"); 719 720 const CXXBasePath &Path = Paths.front(); 721 722 // We first go backward and check if we have a virtual base. 723 // FIXME: It would be better if CXXBasePath had the base specifier for 724 // the nearest virtual base. 725 unsigned Start = 0; 726 for (unsigned I = Path.size(); I != 0; --I) { 727 if (Path[I - 1].Base->isVirtual()) { 728 Start = I - 1; 729 break; 730 } 731 } 732 733 // Now add all bases. 734 for (unsigned I = Start, E = Path.size(); I != E; ++I) 735 BasePathArray.push_back(Path[I].Base); 736} 737 738/// \brief Determine whether the given base path includes a virtual 739/// base class. 740bool Sema::BasePathInvolvesVirtualBase(const CXXBaseSpecifierArray &BasePath) { 741 for (CXXBaseSpecifierArray::iterator B = BasePath.begin(), 742 BEnd = BasePath.end(); 743 B != BEnd; ++B) 744 if ((*B)->isVirtual()) 745 return true; 746 747 return false; 748} 749 750/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 751/// conversion (where Derived and Base are class types) is 752/// well-formed, meaning that the conversion is unambiguous (and 753/// that all of the base classes are accessible). Returns true 754/// and emits a diagnostic if the code is ill-formed, returns false 755/// otherwise. Loc is the location where this routine should point to 756/// if there is an error, and Range is the source range to highlight 757/// if there is an error. 758bool 759Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 760 unsigned InaccessibleBaseID, 761 unsigned AmbigiousBaseConvID, 762 SourceLocation Loc, SourceRange Range, 763 DeclarationName Name, 764 CXXBaseSpecifierArray *BasePath) { 765 // First, determine whether the path from Derived to Base is 766 // ambiguous. This is slightly more expensive than checking whether 767 // the Derived to Base conversion exists, because here we need to 768 // explore multiple paths to determine if there is an ambiguity. 769 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 770 /*DetectVirtual=*/false); 771 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 772 assert(DerivationOkay && 773 "Can only be used with a derived-to-base conversion"); 774 (void)DerivationOkay; 775 776 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 777 if (InaccessibleBaseID) { 778 // Check that the base class can be accessed. 779 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 780 InaccessibleBaseID)) { 781 case AR_inaccessible: 782 return true; 783 case AR_accessible: 784 case AR_dependent: 785 case AR_delayed: 786 break; 787 } 788 } 789 790 // Build a base path if necessary. 791 if (BasePath) 792 BuildBasePathArray(Paths, *BasePath); 793 return false; 794 } 795 796 // We know that the derived-to-base conversion is ambiguous, and 797 // we're going to produce a diagnostic. Perform the derived-to-base 798 // search just one more time to compute all of the possible paths so 799 // that we can print them out. This is more expensive than any of 800 // the previous derived-to-base checks we've done, but at this point 801 // performance isn't as much of an issue. 802 Paths.clear(); 803 Paths.setRecordingPaths(true); 804 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 805 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 806 (void)StillOkay; 807 808 // Build up a textual representation of the ambiguous paths, e.g., 809 // D -> B -> A, that will be used to illustrate the ambiguous 810 // conversions in the diagnostic. We only print one of the paths 811 // to each base class subobject. 812 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 813 814 Diag(Loc, AmbigiousBaseConvID) 815 << Derived << Base << PathDisplayStr << Range << Name; 816 return true; 817} 818 819bool 820Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 821 SourceLocation Loc, SourceRange Range, 822 CXXBaseSpecifierArray *BasePath, 823 bool IgnoreAccess) { 824 return CheckDerivedToBaseConversion(Derived, Base, 825 IgnoreAccess ? 0 826 : diag::err_upcast_to_inaccessible_base, 827 diag::err_ambiguous_derived_to_base_conv, 828 Loc, Range, DeclarationName(), 829 BasePath); 830} 831 832 833/// @brief Builds a string representing ambiguous paths from a 834/// specific derived class to different subobjects of the same base 835/// class. 836/// 837/// This function builds a string that can be used in error messages 838/// to show the different paths that one can take through the 839/// inheritance hierarchy to go from the derived class to different 840/// subobjects of a base class. The result looks something like this: 841/// @code 842/// struct D -> struct B -> struct A 843/// struct D -> struct C -> struct A 844/// @endcode 845std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 846 std::string PathDisplayStr; 847 std::set<unsigned> DisplayedPaths; 848 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 849 Path != Paths.end(); ++Path) { 850 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 851 // We haven't displayed a path to this particular base 852 // class subobject yet. 853 PathDisplayStr += "\n "; 854 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 855 for (CXXBasePath::const_iterator Element = Path->begin(); 856 Element != Path->end(); ++Element) 857 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 858 } 859 } 860 861 return PathDisplayStr; 862} 863 864//===----------------------------------------------------------------------===// 865// C++ class member Handling 866//===----------------------------------------------------------------------===// 867 868/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 869/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 870/// bitfield width if there is one and 'InitExpr' specifies the initializer if 871/// any. 872Sema::DeclPtrTy 873Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 874 MultiTemplateParamsArg TemplateParameterLists, 875 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 876 bool Deleted) { 877 const DeclSpec &DS = D.getDeclSpec(); 878 DeclarationName Name = GetNameForDeclarator(D); 879 Expr *BitWidth = static_cast<Expr*>(BW); 880 Expr *Init = static_cast<Expr*>(InitExpr); 881 SourceLocation Loc = D.getIdentifierLoc(); 882 883 bool isFunc = D.isFunctionDeclarator(); 884 885 assert(!DS.isFriendSpecified()); 886 887 // C++ 9.2p6: A member shall not be declared to have automatic storage 888 // duration (auto, register) or with the extern storage-class-specifier. 889 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 890 // data members and cannot be applied to names declared const or static, 891 // and cannot be applied to reference members. 892 switch (DS.getStorageClassSpec()) { 893 case DeclSpec::SCS_unspecified: 894 case DeclSpec::SCS_typedef: 895 case DeclSpec::SCS_static: 896 // FALL THROUGH. 897 break; 898 case DeclSpec::SCS_mutable: 899 if (isFunc) { 900 if (DS.getStorageClassSpecLoc().isValid()) 901 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 902 else 903 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 904 905 // FIXME: It would be nicer if the keyword was ignored only for this 906 // declarator. Otherwise we could get follow-up errors. 907 D.getMutableDeclSpec().ClearStorageClassSpecs(); 908 } else { 909 QualType T = GetTypeForDeclarator(D, S); 910 diag::kind err = static_cast<diag::kind>(0); 911 if (T->isReferenceType()) 912 err = diag::err_mutable_reference; 913 else if (T.isConstQualified()) 914 err = diag::err_mutable_const; 915 if (err != 0) { 916 if (DS.getStorageClassSpecLoc().isValid()) 917 Diag(DS.getStorageClassSpecLoc(), err); 918 else 919 Diag(DS.getThreadSpecLoc(), err); 920 // FIXME: It would be nicer if the keyword was ignored only for this 921 // declarator. Otherwise we could get follow-up errors. 922 D.getMutableDeclSpec().ClearStorageClassSpecs(); 923 } 924 } 925 break; 926 default: 927 if (DS.getStorageClassSpecLoc().isValid()) 928 Diag(DS.getStorageClassSpecLoc(), 929 diag::err_storageclass_invalid_for_member); 930 else 931 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 932 D.getMutableDeclSpec().ClearStorageClassSpecs(); 933 } 934 935 if (!isFunc && 936 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 937 D.getNumTypeObjects() == 0) { 938 // Check also for this case: 939 // 940 // typedef int f(); 941 // f a; 942 // 943 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 944 isFunc = TDType->isFunctionType(); 945 } 946 947 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 948 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 949 !isFunc); 950 951 Decl *Member; 952 if (isInstField) { 953 // FIXME: Check for template parameters! 954 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 955 AS); 956 assert(Member && "HandleField never returns null"); 957 } else { 958 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 959 .getAs<Decl>(); 960 if (!Member) { 961 if (BitWidth) DeleteExpr(BitWidth); 962 return DeclPtrTy(); 963 } 964 965 // Non-instance-fields can't have a bitfield. 966 if (BitWidth) { 967 if (Member->isInvalidDecl()) { 968 // don't emit another diagnostic. 969 } else if (isa<VarDecl>(Member)) { 970 // C++ 9.6p3: A bit-field shall not be a static member. 971 // "static member 'A' cannot be a bit-field" 972 Diag(Loc, diag::err_static_not_bitfield) 973 << Name << BitWidth->getSourceRange(); 974 } else if (isa<TypedefDecl>(Member)) { 975 // "typedef member 'x' cannot be a bit-field" 976 Diag(Loc, diag::err_typedef_not_bitfield) 977 << Name << BitWidth->getSourceRange(); 978 } else { 979 // A function typedef ("typedef int f(); f a;"). 980 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 981 Diag(Loc, diag::err_not_integral_type_bitfield) 982 << Name << cast<ValueDecl>(Member)->getType() 983 << BitWidth->getSourceRange(); 984 } 985 986 DeleteExpr(BitWidth); 987 BitWidth = 0; 988 Member->setInvalidDecl(); 989 } 990 991 Member->setAccess(AS); 992 993 // If we have declared a member function template, set the access of the 994 // templated declaration as well. 995 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 996 FunTmpl->getTemplatedDecl()->setAccess(AS); 997 } 998 999 assert((Name || isInstField) && "No identifier for non-field ?"); 1000 1001 if (Init) 1002 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 1003 if (Deleted) // FIXME: Source location is not very good. 1004 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 1005 1006 if (isInstField) { 1007 FieldCollector->Add(cast<FieldDecl>(Member)); 1008 return DeclPtrTy(); 1009 } 1010 return DeclPtrTy::make(Member); 1011} 1012 1013/// \brief Find the direct and/or virtual base specifiers that 1014/// correspond to the given base type, for use in base initialization 1015/// within a constructor. 1016static bool FindBaseInitializer(Sema &SemaRef, 1017 CXXRecordDecl *ClassDecl, 1018 QualType BaseType, 1019 const CXXBaseSpecifier *&DirectBaseSpec, 1020 const CXXBaseSpecifier *&VirtualBaseSpec) { 1021 // First, check for a direct base class. 1022 DirectBaseSpec = 0; 1023 for (CXXRecordDecl::base_class_const_iterator Base 1024 = ClassDecl->bases_begin(); 1025 Base != ClassDecl->bases_end(); ++Base) { 1026 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1027 // We found a direct base of this type. That's what we're 1028 // initializing. 1029 DirectBaseSpec = &*Base; 1030 break; 1031 } 1032 } 1033 1034 // Check for a virtual base class. 1035 // FIXME: We might be able to short-circuit this if we know in advance that 1036 // there are no virtual bases. 1037 VirtualBaseSpec = 0; 1038 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1039 // We haven't found a base yet; search the class hierarchy for a 1040 // virtual base class. 1041 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1042 /*DetectVirtual=*/false); 1043 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1044 BaseType, Paths)) { 1045 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1046 Path != Paths.end(); ++Path) { 1047 if (Path->back().Base->isVirtual()) { 1048 VirtualBaseSpec = Path->back().Base; 1049 break; 1050 } 1051 } 1052 } 1053 } 1054 1055 return DirectBaseSpec || VirtualBaseSpec; 1056} 1057 1058/// ActOnMemInitializer - Handle a C++ member initializer. 1059Sema::MemInitResult 1060Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1061 Scope *S, 1062 CXXScopeSpec &SS, 1063 IdentifierInfo *MemberOrBase, 1064 TypeTy *TemplateTypeTy, 1065 SourceLocation IdLoc, 1066 SourceLocation LParenLoc, 1067 ExprTy **Args, unsigned NumArgs, 1068 SourceLocation *CommaLocs, 1069 SourceLocation RParenLoc) { 1070 if (!ConstructorD) 1071 return true; 1072 1073 AdjustDeclIfTemplate(ConstructorD); 1074 1075 CXXConstructorDecl *Constructor 1076 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1077 if (!Constructor) { 1078 // The user wrote a constructor initializer on a function that is 1079 // not a C++ constructor. Ignore the error for now, because we may 1080 // have more member initializers coming; we'll diagnose it just 1081 // once in ActOnMemInitializers. 1082 return true; 1083 } 1084 1085 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1086 1087 // C++ [class.base.init]p2: 1088 // Names in a mem-initializer-id are looked up in the scope of the 1089 // constructor’s class and, if not found in that scope, are looked 1090 // up in the scope containing the constructor’s 1091 // definition. [Note: if the constructor’s class contains a member 1092 // with the same name as a direct or virtual base class of the 1093 // class, a mem-initializer-id naming the member or base class and 1094 // composed of a single identifier refers to the class member. A 1095 // mem-initializer-id for the hidden base class may be specified 1096 // using a qualified name. ] 1097 if (!SS.getScopeRep() && !TemplateTypeTy) { 1098 // Look for a member, first. 1099 FieldDecl *Member = 0; 1100 DeclContext::lookup_result Result 1101 = ClassDecl->lookup(MemberOrBase); 1102 if (Result.first != Result.second) 1103 Member = dyn_cast<FieldDecl>(*Result.first); 1104 1105 // FIXME: Handle members of an anonymous union. 1106 1107 if (Member) 1108 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1109 LParenLoc, RParenLoc); 1110 } 1111 // It didn't name a member, so see if it names a class. 1112 QualType BaseType; 1113 TypeSourceInfo *TInfo = 0; 1114 1115 if (TemplateTypeTy) { 1116 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1117 } else { 1118 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1119 LookupParsedName(R, S, &SS); 1120 1121 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1122 if (!TyD) { 1123 if (R.isAmbiguous()) return true; 1124 1125 // We don't want access-control diagnostics here. 1126 R.suppressDiagnostics(); 1127 1128 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1129 bool NotUnknownSpecialization = false; 1130 DeclContext *DC = computeDeclContext(SS, false); 1131 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1132 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1133 1134 if (!NotUnknownSpecialization) { 1135 // When the scope specifier can refer to a member of an unknown 1136 // specialization, we take it as a type name. 1137 BaseType = CheckTypenameType(ETK_None, 1138 (NestedNameSpecifier *)SS.getScopeRep(), 1139 *MemberOrBase, SS.getRange()); 1140 if (BaseType.isNull()) 1141 return true; 1142 1143 R.clear(); 1144 } 1145 } 1146 1147 // If no results were found, try to correct typos. 1148 if (R.empty() && BaseType.isNull() && 1149 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1150 R.isSingleResult()) { 1151 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1152 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1153 // We have found a non-static data member with a similar 1154 // name to what was typed; complain and initialize that 1155 // member. 1156 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1157 << MemberOrBase << true << R.getLookupName() 1158 << FixItHint::CreateReplacement(R.getNameLoc(), 1159 R.getLookupName().getAsString()); 1160 Diag(Member->getLocation(), diag::note_previous_decl) 1161 << Member->getDeclName(); 1162 1163 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1164 LParenLoc, RParenLoc); 1165 } 1166 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1167 const CXXBaseSpecifier *DirectBaseSpec; 1168 const CXXBaseSpecifier *VirtualBaseSpec; 1169 if (FindBaseInitializer(*this, ClassDecl, 1170 Context.getTypeDeclType(Type), 1171 DirectBaseSpec, VirtualBaseSpec)) { 1172 // We have found a direct or virtual base class with a 1173 // similar name to what was typed; complain and initialize 1174 // that base class. 1175 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1176 << MemberOrBase << false << R.getLookupName() 1177 << FixItHint::CreateReplacement(R.getNameLoc(), 1178 R.getLookupName().getAsString()); 1179 1180 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1181 : VirtualBaseSpec; 1182 Diag(BaseSpec->getSourceRange().getBegin(), 1183 diag::note_base_class_specified_here) 1184 << BaseSpec->getType() 1185 << BaseSpec->getSourceRange(); 1186 1187 TyD = Type; 1188 } 1189 } 1190 } 1191 1192 if (!TyD && BaseType.isNull()) { 1193 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1194 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1195 return true; 1196 } 1197 } 1198 1199 if (BaseType.isNull()) { 1200 BaseType = Context.getTypeDeclType(TyD); 1201 if (SS.isSet()) { 1202 NestedNameSpecifier *Qualifier = 1203 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1204 1205 // FIXME: preserve source range information 1206 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1207 } 1208 } 1209 } 1210 1211 if (!TInfo) 1212 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1213 1214 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1215 LParenLoc, RParenLoc, ClassDecl); 1216} 1217 1218/// Checks an initializer expression for use of uninitialized fields, such as 1219/// containing the field that is being initialized. Returns true if there is an 1220/// uninitialized field was used an updates the SourceLocation parameter; false 1221/// otherwise. 1222static bool InitExprContainsUninitializedFields(const Stmt* S, 1223 const FieldDecl* LhsField, 1224 SourceLocation* L) { 1225 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1226 if (ME) { 1227 const NamedDecl* RhsField = ME->getMemberDecl(); 1228 if (RhsField == LhsField) { 1229 // Initializing a field with itself. Throw a warning. 1230 // But wait; there are exceptions! 1231 // Exception #1: The field may not belong to this record. 1232 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1233 const Expr* base = ME->getBase(); 1234 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1235 // Even though the field matches, it does not belong to this record. 1236 return false; 1237 } 1238 // None of the exceptions triggered; return true to indicate an 1239 // uninitialized field was used. 1240 *L = ME->getMemberLoc(); 1241 return true; 1242 } 1243 } 1244 bool found = false; 1245 for (Stmt::const_child_iterator it = S->child_begin(); 1246 it != S->child_end() && found == false; 1247 ++it) { 1248 if (isa<CallExpr>(S)) { 1249 // Do not descend into function calls or constructors, as the use 1250 // of an uninitialized field may be valid. One would have to inspect 1251 // the contents of the function/ctor to determine if it is safe or not. 1252 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1253 // may be safe, depending on what the function/ctor does. 1254 continue; 1255 } 1256 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1257 } 1258 return found; 1259} 1260 1261Sema::MemInitResult 1262Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1263 unsigned NumArgs, SourceLocation IdLoc, 1264 SourceLocation LParenLoc, 1265 SourceLocation RParenLoc) { 1266 // Diagnose value-uses of fields to initialize themselves, e.g. 1267 // foo(foo) 1268 // where foo is not also a parameter to the constructor. 1269 // TODO: implement -Wuninitialized and fold this into that framework. 1270 for (unsigned i = 0; i < NumArgs; ++i) { 1271 SourceLocation L; 1272 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1273 // FIXME: Return true in the case when other fields are used before being 1274 // uninitialized. For example, let this field be the i'th field. When 1275 // initializing the i'th field, throw a warning if any of the >= i'th 1276 // fields are used, as they are not yet initialized. 1277 // Right now we are only handling the case where the i'th field uses 1278 // itself in its initializer. 1279 Diag(L, diag::warn_field_is_uninit); 1280 } 1281 } 1282 1283 bool HasDependentArg = false; 1284 for (unsigned i = 0; i < NumArgs; i++) 1285 HasDependentArg |= Args[i]->isTypeDependent(); 1286 1287 QualType FieldType = Member->getType(); 1288 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1289 FieldType = Array->getElementType(); 1290 if (FieldType->isDependentType() || HasDependentArg) { 1291 // Can't check initialization for a member of dependent type or when 1292 // any of the arguments are type-dependent expressions. 1293 OwningExprResult Init 1294 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1295 RParenLoc)); 1296 1297 // Erase any temporaries within this evaluation context; we're not 1298 // going to track them in the AST, since we'll be rebuilding the 1299 // ASTs during template instantiation. 1300 ExprTemporaries.erase( 1301 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1302 ExprTemporaries.end()); 1303 1304 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1305 LParenLoc, 1306 Init.takeAs<Expr>(), 1307 RParenLoc); 1308 1309 } 1310 1311 if (Member->isInvalidDecl()) 1312 return true; 1313 1314 // Initialize the member. 1315 InitializedEntity MemberEntity = 1316 InitializedEntity::InitializeMember(Member, 0); 1317 InitializationKind Kind = 1318 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1319 1320 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1321 1322 OwningExprResult MemberInit = 1323 InitSeq.Perform(*this, MemberEntity, Kind, 1324 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1325 if (MemberInit.isInvalid()) 1326 return true; 1327 1328 // C++0x [class.base.init]p7: 1329 // The initialization of each base and member constitutes a 1330 // full-expression. 1331 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1332 if (MemberInit.isInvalid()) 1333 return true; 1334 1335 // If we are in a dependent context, template instantiation will 1336 // perform this type-checking again. Just save the arguments that we 1337 // received in a ParenListExpr. 1338 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1339 // of the information that we have about the member 1340 // initializer. However, deconstructing the ASTs is a dicey process, 1341 // and this approach is far more likely to get the corner cases right. 1342 if (CurContext->isDependentContext()) { 1343 // Bump the reference count of all of the arguments. 1344 for (unsigned I = 0; I != NumArgs; ++I) 1345 Args[I]->Retain(); 1346 1347 OwningExprResult Init 1348 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1349 RParenLoc)); 1350 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1351 LParenLoc, 1352 Init.takeAs<Expr>(), 1353 RParenLoc); 1354 } 1355 1356 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1357 LParenLoc, 1358 MemberInit.takeAs<Expr>(), 1359 RParenLoc); 1360} 1361 1362Sema::MemInitResult 1363Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1364 Expr **Args, unsigned NumArgs, 1365 SourceLocation LParenLoc, SourceLocation RParenLoc, 1366 CXXRecordDecl *ClassDecl) { 1367 bool HasDependentArg = false; 1368 for (unsigned i = 0; i < NumArgs; i++) 1369 HasDependentArg |= Args[i]->isTypeDependent(); 1370 1371 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1372 if (BaseType->isDependentType() || HasDependentArg) { 1373 // Can't check initialization for a base of dependent type or when 1374 // any of the arguments are type-dependent expressions. 1375 OwningExprResult BaseInit 1376 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1377 RParenLoc)); 1378 1379 // Erase any temporaries within this evaluation context; we're not 1380 // going to track them in the AST, since we'll be rebuilding the 1381 // ASTs during template instantiation. 1382 ExprTemporaries.erase( 1383 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1384 ExprTemporaries.end()); 1385 1386 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1387 /*IsVirtual=*/false, 1388 LParenLoc, 1389 BaseInit.takeAs<Expr>(), 1390 RParenLoc); 1391 } 1392 1393 if (!BaseType->isRecordType()) 1394 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1395 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1396 1397 // C++ [class.base.init]p2: 1398 // [...] Unless the mem-initializer-id names a nonstatic data 1399 // member of the constructor’s class or a direct or virtual base 1400 // of that class, the mem-initializer is ill-formed. A 1401 // mem-initializer-list can initialize a base class using any 1402 // name that denotes that base class type. 1403 1404 // Check for direct and virtual base classes. 1405 const CXXBaseSpecifier *DirectBaseSpec = 0; 1406 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1407 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1408 VirtualBaseSpec); 1409 1410 // C++ [base.class.init]p2: 1411 // If a mem-initializer-id is ambiguous because it designates both 1412 // a direct non-virtual base class and an inherited virtual base 1413 // class, the mem-initializer is ill-formed. 1414 if (DirectBaseSpec && VirtualBaseSpec) 1415 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1416 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1417 // C++ [base.class.init]p2: 1418 // Unless the mem-initializer-id names a nonstatic data membeer of the 1419 // constructor's class ot a direst or virtual base of that class, the 1420 // mem-initializer is ill-formed. 1421 if (!DirectBaseSpec && !VirtualBaseSpec) 1422 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1423 << BaseType << Context.getTypeDeclType(ClassDecl) 1424 << BaseTInfo->getTypeLoc().getSourceRange(); 1425 1426 CXXBaseSpecifier *BaseSpec 1427 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1428 if (!BaseSpec) 1429 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1430 1431 // Initialize the base. 1432 InitializedEntity BaseEntity = 1433 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1434 InitializationKind Kind = 1435 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1436 1437 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1438 1439 OwningExprResult BaseInit = 1440 InitSeq.Perform(*this, BaseEntity, Kind, 1441 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1442 if (BaseInit.isInvalid()) 1443 return true; 1444 1445 // C++0x [class.base.init]p7: 1446 // The initialization of each base and member constitutes a 1447 // full-expression. 1448 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1449 if (BaseInit.isInvalid()) 1450 return true; 1451 1452 // If we are in a dependent context, template instantiation will 1453 // perform this type-checking again. Just save the arguments that we 1454 // received in a ParenListExpr. 1455 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1456 // of the information that we have about the base 1457 // initializer. However, deconstructing the ASTs is a dicey process, 1458 // and this approach is far more likely to get the corner cases right. 1459 if (CurContext->isDependentContext()) { 1460 // Bump the reference count of all of the arguments. 1461 for (unsigned I = 0; I != NumArgs; ++I) 1462 Args[I]->Retain(); 1463 1464 OwningExprResult Init 1465 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1466 RParenLoc)); 1467 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1468 BaseSpec->isVirtual(), 1469 LParenLoc, 1470 Init.takeAs<Expr>(), 1471 RParenLoc); 1472 } 1473 1474 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1475 BaseSpec->isVirtual(), 1476 LParenLoc, 1477 BaseInit.takeAs<Expr>(), 1478 RParenLoc); 1479} 1480 1481/// ImplicitInitializerKind - How an implicit base or member initializer should 1482/// initialize its base or member. 1483enum ImplicitInitializerKind { 1484 IIK_Default, 1485 IIK_Copy, 1486 IIK_Move 1487}; 1488 1489static bool 1490BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1491 ImplicitInitializerKind ImplicitInitKind, 1492 CXXBaseSpecifier *BaseSpec, 1493 bool IsInheritedVirtualBase, 1494 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1495 InitializedEntity InitEntity 1496 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1497 IsInheritedVirtualBase); 1498 1499 Sema::OwningExprResult BaseInit(SemaRef); 1500 1501 switch (ImplicitInitKind) { 1502 case IIK_Default: { 1503 InitializationKind InitKind 1504 = InitializationKind::CreateDefault(Constructor->getLocation()); 1505 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1506 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1507 Sema::MultiExprArg(SemaRef, 0, 0)); 1508 break; 1509 } 1510 1511 case IIK_Copy: { 1512 ParmVarDecl *Param = Constructor->getParamDecl(0); 1513 QualType ParamType = Param->getType().getNonReferenceType(); 1514 1515 Expr *CopyCtorArg = 1516 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1517 Constructor->getLocation(), ParamType, 0); 1518 1519 // Cast to the base class to avoid ambiguities. 1520 QualType ArgTy = 1521 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1522 ParamType.getQualifiers()); 1523 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1524 CastExpr::CK_UncheckedDerivedToBase, 1525 /*isLvalue=*/true, 1526 CXXBaseSpecifierArray(BaseSpec)); 1527 1528 InitializationKind InitKind 1529 = InitializationKind::CreateDirect(Constructor->getLocation(), 1530 SourceLocation(), SourceLocation()); 1531 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1532 &CopyCtorArg, 1); 1533 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1534 Sema::MultiExprArg(SemaRef, 1535 (void**)&CopyCtorArg, 1)); 1536 break; 1537 } 1538 1539 case IIK_Move: 1540 assert(false && "Unhandled initializer kind!"); 1541 } 1542 1543 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1544 if (BaseInit.isInvalid()) 1545 return true; 1546 1547 CXXBaseInit = 1548 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1549 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1550 SourceLocation()), 1551 BaseSpec->isVirtual(), 1552 SourceLocation(), 1553 BaseInit.takeAs<Expr>(), 1554 SourceLocation()); 1555 1556 return false; 1557} 1558 1559static bool 1560BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1561 ImplicitInitializerKind ImplicitInitKind, 1562 FieldDecl *Field, 1563 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1564 if (ImplicitInitKind == IIK_Copy) { 1565 SourceLocation Loc = Constructor->getLocation(); 1566 ParmVarDecl *Param = Constructor->getParamDecl(0); 1567 QualType ParamType = Param->getType().getNonReferenceType(); 1568 1569 Expr *MemberExprBase = 1570 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1571 Loc, ParamType, 0); 1572 1573 // Build a reference to this field within the parameter. 1574 CXXScopeSpec SS; 1575 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1576 Sema::LookupMemberName); 1577 MemberLookup.addDecl(Field, AS_public); 1578 MemberLookup.resolveKind(); 1579 Sema::OwningExprResult CopyCtorArg 1580 = SemaRef.BuildMemberReferenceExpr(SemaRef.Owned(MemberExprBase), 1581 ParamType, Loc, 1582 /*IsArrow=*/false, 1583 SS, 1584 /*FirstQualifierInScope=*/0, 1585 MemberLookup, 1586 /*TemplateArgs=*/0); 1587 if (CopyCtorArg.isInvalid()) 1588 return true; 1589 1590 // When the field we are copying is an array, create index variables for 1591 // each dimension of the array. We use these index variables to subscript 1592 // the source array, and other clients (e.g., CodeGen) will perform the 1593 // necessary iteration with these index variables. 1594 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1595 QualType BaseType = Field->getType(); 1596 QualType SizeType = SemaRef.Context.getSizeType(); 1597 while (const ConstantArrayType *Array 1598 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1599 // Create the iteration variable for this array index. 1600 IdentifierInfo *IterationVarName = 0; 1601 { 1602 llvm::SmallString<8> Str; 1603 llvm::raw_svector_ostream OS(Str); 1604 OS << "__i" << IndexVariables.size(); 1605 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1606 } 1607 VarDecl *IterationVar 1608 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1609 IterationVarName, SizeType, 1610 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1611 VarDecl::None, VarDecl::None); 1612 IndexVariables.push_back(IterationVar); 1613 1614 // Create a reference to the iteration variable. 1615 Sema::OwningExprResult IterationVarRef 1616 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1617 assert(!IterationVarRef.isInvalid() && 1618 "Reference to invented variable cannot fail!"); 1619 1620 // Subscript the array with this iteration variable. 1621 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(move(CopyCtorArg), 1622 Loc, 1623 move(IterationVarRef), 1624 Loc); 1625 if (CopyCtorArg.isInvalid()) 1626 return true; 1627 1628 BaseType = Array->getElementType(); 1629 } 1630 1631 // Construct the entity that we will be initializing. For an array, this 1632 // will be first element in the array, which may require several levels 1633 // of array-subscript entities. 1634 llvm::SmallVector<InitializedEntity, 4> Entities; 1635 Entities.reserve(1 + IndexVariables.size()); 1636 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1637 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1638 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1639 0, 1640 Entities.back())); 1641 1642 // Direct-initialize to use the copy constructor. 1643 InitializationKind InitKind = 1644 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1645 1646 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1647 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1648 &CopyCtorArgE, 1); 1649 1650 Sema::OwningExprResult MemberInit 1651 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1652 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArgE, 1)); 1653 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1654 if (MemberInit.isInvalid()) 1655 return true; 1656 1657 CXXMemberInit 1658 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1659 MemberInit.takeAs<Expr>(), Loc, 1660 IndexVariables.data(), 1661 IndexVariables.size()); 1662 return false; 1663 } 1664 1665 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1666 1667 QualType FieldBaseElementType = 1668 SemaRef.Context.getBaseElementType(Field->getType()); 1669 1670 if (FieldBaseElementType->isRecordType()) { 1671 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1672 InitializationKind InitKind = 1673 InitializationKind::CreateDefault(Constructor->getLocation()); 1674 1675 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1676 Sema::OwningExprResult MemberInit = 1677 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1678 Sema::MultiExprArg(SemaRef, 0, 0)); 1679 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1680 if (MemberInit.isInvalid()) 1681 return true; 1682 1683 CXXMemberInit = 1684 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1685 Field, SourceLocation(), 1686 SourceLocation(), 1687 MemberInit.takeAs<Expr>(), 1688 SourceLocation()); 1689 return false; 1690 } 1691 1692 if (FieldBaseElementType->isReferenceType()) { 1693 SemaRef.Diag(Constructor->getLocation(), 1694 diag::err_uninitialized_member_in_ctor) 1695 << (int)Constructor->isImplicit() 1696 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1697 << 0 << Field->getDeclName(); 1698 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1699 return true; 1700 } 1701 1702 if (FieldBaseElementType.isConstQualified()) { 1703 SemaRef.Diag(Constructor->getLocation(), 1704 diag::err_uninitialized_member_in_ctor) 1705 << (int)Constructor->isImplicit() 1706 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1707 << 1 << Field->getDeclName(); 1708 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1709 return true; 1710 } 1711 1712 // Nothing to initialize. 1713 CXXMemberInit = 0; 1714 return false; 1715} 1716 1717bool 1718Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1719 CXXBaseOrMemberInitializer **Initializers, 1720 unsigned NumInitializers, 1721 bool AnyErrors) { 1722 if (Constructor->getDeclContext()->isDependentContext()) { 1723 // Just store the initializers as written, they will be checked during 1724 // instantiation. 1725 if (NumInitializers > 0) { 1726 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1727 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1728 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1729 memcpy(baseOrMemberInitializers, Initializers, 1730 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1731 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1732 } 1733 1734 return false; 1735 } 1736 1737 ImplicitInitializerKind ImplicitInitKind = IIK_Default; 1738 1739 // FIXME: Handle implicit move constructors. 1740 if (Constructor->isImplicit() && Constructor->isCopyConstructor()) 1741 ImplicitInitKind = IIK_Copy; 1742 1743 // We need to build the initializer AST according to order of construction 1744 // and not what user specified in the Initializers list. 1745 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1746 if (!ClassDecl) 1747 return true; 1748 1749 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1750 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1751 bool HadError = false; 1752 1753 for (unsigned i = 0; i < NumInitializers; i++) { 1754 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1755 1756 if (Member->isBaseInitializer()) 1757 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1758 else 1759 AllBaseFields[Member->getMember()] = Member; 1760 } 1761 1762 // Keep track of the direct virtual bases. 1763 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1764 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1765 E = ClassDecl->bases_end(); I != E; ++I) { 1766 if (I->isVirtual()) 1767 DirectVBases.insert(I); 1768 } 1769 1770 // Push virtual bases before others. 1771 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1772 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1773 1774 if (CXXBaseOrMemberInitializer *Value 1775 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1776 AllToInit.push_back(Value); 1777 } else if (!AnyErrors) { 1778 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1779 CXXBaseOrMemberInitializer *CXXBaseInit; 1780 if (BuildImplicitBaseInitializer(*this, Constructor, ImplicitInitKind, 1781 VBase, IsInheritedVirtualBase, 1782 CXXBaseInit)) { 1783 HadError = true; 1784 continue; 1785 } 1786 1787 AllToInit.push_back(CXXBaseInit); 1788 } 1789 } 1790 1791 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1792 E = ClassDecl->bases_end(); Base != E; ++Base) { 1793 // Virtuals are in the virtual base list and already constructed. 1794 if (Base->isVirtual()) 1795 continue; 1796 1797 if (CXXBaseOrMemberInitializer *Value 1798 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1799 AllToInit.push_back(Value); 1800 } else if (!AnyErrors) { 1801 CXXBaseOrMemberInitializer *CXXBaseInit; 1802 if (BuildImplicitBaseInitializer(*this, Constructor, ImplicitInitKind, 1803 Base, /*IsInheritedVirtualBase=*/false, 1804 CXXBaseInit)) { 1805 HadError = true; 1806 continue; 1807 } 1808 1809 AllToInit.push_back(CXXBaseInit); 1810 } 1811 } 1812 1813 // non-static data members. 1814 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1815 E = ClassDecl->field_end(); Field != E; ++Field) { 1816 if ((*Field)->isAnonymousStructOrUnion()) { 1817 if (const RecordType *FieldClassType = 1818 Field->getType()->getAs<RecordType>()) { 1819 CXXRecordDecl *FieldClassDecl 1820 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1821 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1822 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1823 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1824 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1825 // set to the anonymous union data member used in the initializer 1826 // list. 1827 Value->setMember(*Field); 1828 Value->setAnonUnionMember(*FA); 1829 AllToInit.push_back(Value); 1830 break; 1831 } 1832 } 1833 } 1834 1835 if (ImplicitInitKind == IIK_Default) 1836 continue; 1837 } 1838 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1839 AllToInit.push_back(Value); 1840 continue; 1841 } 1842 1843 if (AnyErrors) 1844 continue; 1845 1846 CXXBaseOrMemberInitializer *Member; 1847 if (BuildImplicitMemberInitializer(*this, Constructor, ImplicitInitKind, 1848 *Field, Member)) { 1849 HadError = true; 1850 continue; 1851 } 1852 1853 // If the member doesn't need to be initialized, it will be null. 1854 if (Member) 1855 AllToInit.push_back(Member); 1856 } 1857 1858 NumInitializers = AllToInit.size(); 1859 if (NumInitializers > 0) { 1860 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1861 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1862 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1863 memcpy(baseOrMemberInitializers, AllToInit.data(), 1864 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1865 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1866 1867 // Constructors implicitly reference the base and member 1868 // destructors. 1869 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1870 Constructor->getParent()); 1871 } 1872 1873 return HadError; 1874} 1875 1876static void *GetKeyForTopLevelField(FieldDecl *Field) { 1877 // For anonymous unions, use the class declaration as the key. 1878 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1879 if (RT->getDecl()->isAnonymousStructOrUnion()) 1880 return static_cast<void *>(RT->getDecl()); 1881 } 1882 return static_cast<void *>(Field); 1883} 1884 1885static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1886 return Context.getCanonicalType(BaseType).getTypePtr(); 1887} 1888 1889static void *GetKeyForMember(ASTContext &Context, 1890 CXXBaseOrMemberInitializer *Member, 1891 bool MemberMaybeAnon = false) { 1892 if (!Member->isMemberInitializer()) 1893 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1894 1895 // For fields injected into the class via declaration of an anonymous union, 1896 // use its anonymous union class declaration as the unique key. 1897 FieldDecl *Field = Member->getMember(); 1898 1899 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1900 // data member of the class. Data member used in the initializer list is 1901 // in AnonUnionMember field. 1902 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1903 Field = Member->getAnonUnionMember(); 1904 1905 // If the field is a member of an anonymous struct or union, our key 1906 // is the anonymous record decl that's a direct child of the class. 1907 RecordDecl *RD = Field->getParent(); 1908 if (RD->isAnonymousStructOrUnion()) { 1909 while (true) { 1910 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1911 if (Parent->isAnonymousStructOrUnion()) 1912 RD = Parent; 1913 else 1914 break; 1915 } 1916 1917 return static_cast<void *>(RD); 1918 } 1919 1920 return static_cast<void *>(Field); 1921} 1922 1923static void 1924DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1925 const CXXConstructorDecl *Constructor, 1926 CXXBaseOrMemberInitializer **Inits, 1927 unsigned NumInits) { 1928 if (Constructor->getDeclContext()->isDependentContext()) 1929 return; 1930 1931 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1932 == Diagnostic::Ignored) 1933 return; 1934 1935 // Build the list of bases and members in the order that they'll 1936 // actually be initialized. The explicit initializers should be in 1937 // this same order but may be missing things. 1938 llvm::SmallVector<const void*, 32> IdealInitKeys; 1939 1940 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1941 1942 // 1. Virtual bases. 1943 for (CXXRecordDecl::base_class_const_iterator VBase = 1944 ClassDecl->vbases_begin(), 1945 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1946 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 1947 1948 // 2. Non-virtual bases. 1949 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1950 E = ClassDecl->bases_end(); Base != E; ++Base) { 1951 if (Base->isVirtual()) 1952 continue; 1953 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 1954 } 1955 1956 // 3. Direct fields. 1957 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1958 E = ClassDecl->field_end(); Field != E; ++Field) 1959 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 1960 1961 unsigned NumIdealInits = IdealInitKeys.size(); 1962 unsigned IdealIndex = 0; 1963 1964 CXXBaseOrMemberInitializer *PrevInit = 0; 1965 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 1966 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 1967 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 1968 1969 // Scan forward to try to find this initializer in the idealized 1970 // initializers list. 1971 for (; IdealIndex != NumIdealInits; ++IdealIndex) 1972 if (InitKey == IdealInitKeys[IdealIndex]) 1973 break; 1974 1975 // If we didn't find this initializer, it must be because we 1976 // scanned past it on a previous iteration. That can only 1977 // happen if we're out of order; emit a warning. 1978 if (IdealIndex == NumIdealInits) { 1979 assert(PrevInit && "initializer not found in initializer list"); 1980 1981 Sema::SemaDiagnosticBuilder D = 1982 SemaRef.Diag(PrevInit->getSourceLocation(), 1983 diag::warn_initializer_out_of_order); 1984 1985 if (PrevInit->isMemberInitializer()) 1986 D << 0 << PrevInit->getMember()->getDeclName(); 1987 else 1988 D << 1 << PrevInit->getBaseClassInfo()->getType(); 1989 1990 if (Init->isMemberInitializer()) 1991 D << 0 << Init->getMember()->getDeclName(); 1992 else 1993 D << 1 << Init->getBaseClassInfo()->getType(); 1994 1995 // Move back to the initializer's location in the ideal list. 1996 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 1997 if (InitKey == IdealInitKeys[IdealIndex]) 1998 break; 1999 2000 assert(IdealIndex != NumIdealInits && 2001 "initializer not found in initializer list"); 2002 } 2003 2004 PrevInit = Init; 2005 } 2006} 2007 2008namespace { 2009bool CheckRedundantInit(Sema &S, 2010 CXXBaseOrMemberInitializer *Init, 2011 CXXBaseOrMemberInitializer *&PrevInit) { 2012 if (!PrevInit) { 2013 PrevInit = Init; 2014 return false; 2015 } 2016 2017 if (FieldDecl *Field = Init->getMember()) 2018 S.Diag(Init->getSourceLocation(), 2019 diag::err_multiple_mem_initialization) 2020 << Field->getDeclName() 2021 << Init->getSourceRange(); 2022 else { 2023 Type *BaseClass = Init->getBaseClass(); 2024 assert(BaseClass && "neither field nor base"); 2025 S.Diag(Init->getSourceLocation(), 2026 diag::err_multiple_base_initialization) 2027 << QualType(BaseClass, 0) 2028 << Init->getSourceRange(); 2029 } 2030 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2031 << 0 << PrevInit->getSourceRange(); 2032 2033 return true; 2034} 2035 2036typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2037typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2038 2039bool CheckRedundantUnionInit(Sema &S, 2040 CXXBaseOrMemberInitializer *Init, 2041 RedundantUnionMap &Unions) { 2042 FieldDecl *Field = Init->getMember(); 2043 RecordDecl *Parent = Field->getParent(); 2044 if (!Parent->isAnonymousStructOrUnion()) 2045 return false; 2046 2047 NamedDecl *Child = Field; 2048 do { 2049 if (Parent->isUnion()) { 2050 UnionEntry &En = Unions[Parent]; 2051 if (En.first && En.first != Child) { 2052 S.Diag(Init->getSourceLocation(), 2053 diag::err_multiple_mem_union_initialization) 2054 << Field->getDeclName() 2055 << Init->getSourceRange(); 2056 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2057 << 0 << En.second->getSourceRange(); 2058 return true; 2059 } else if (!En.first) { 2060 En.first = Child; 2061 En.second = Init; 2062 } 2063 } 2064 2065 Child = Parent; 2066 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2067 } while (Parent->isAnonymousStructOrUnion()); 2068 2069 return false; 2070} 2071} 2072 2073/// ActOnMemInitializers - Handle the member initializers for a constructor. 2074void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 2075 SourceLocation ColonLoc, 2076 MemInitTy **meminits, unsigned NumMemInits, 2077 bool AnyErrors) { 2078 if (!ConstructorDecl) 2079 return; 2080 2081 AdjustDeclIfTemplate(ConstructorDecl); 2082 2083 CXXConstructorDecl *Constructor 2084 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 2085 2086 if (!Constructor) { 2087 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2088 return; 2089 } 2090 2091 CXXBaseOrMemberInitializer **MemInits = 2092 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2093 2094 // Mapping for the duplicate initializers check. 2095 // For member initializers, this is keyed with a FieldDecl*. 2096 // For base initializers, this is keyed with a Type*. 2097 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2098 2099 // Mapping for the inconsistent anonymous-union initializers check. 2100 RedundantUnionMap MemberUnions; 2101 2102 bool HadError = false; 2103 for (unsigned i = 0; i < NumMemInits; i++) { 2104 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2105 2106 if (Init->isMemberInitializer()) { 2107 FieldDecl *Field = Init->getMember(); 2108 if (CheckRedundantInit(*this, Init, Members[Field]) || 2109 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2110 HadError = true; 2111 } else { 2112 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2113 if (CheckRedundantInit(*this, Init, Members[Key])) 2114 HadError = true; 2115 } 2116 } 2117 2118 if (HadError) 2119 return; 2120 2121 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2122 2123 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2124} 2125 2126void 2127Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2128 CXXRecordDecl *ClassDecl) { 2129 // Ignore dependent contexts. 2130 if (ClassDecl->isDependentContext()) 2131 return; 2132 2133 // FIXME: all the access-control diagnostics are positioned on the 2134 // field/base declaration. That's probably good; that said, the 2135 // user might reasonably want to know why the destructor is being 2136 // emitted, and we currently don't say. 2137 2138 // Non-static data members. 2139 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2140 E = ClassDecl->field_end(); I != E; ++I) { 2141 FieldDecl *Field = *I; 2142 2143 QualType FieldType = Context.getBaseElementType(Field->getType()); 2144 2145 const RecordType* RT = FieldType->getAs<RecordType>(); 2146 if (!RT) 2147 continue; 2148 2149 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2150 if (FieldClassDecl->hasTrivialDestructor()) 2151 continue; 2152 2153 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 2154 CheckDestructorAccess(Field->getLocation(), Dtor, 2155 PDiag(diag::err_access_dtor_field) 2156 << Field->getDeclName() 2157 << FieldType); 2158 2159 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2160 } 2161 2162 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2163 2164 // Bases. 2165 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2166 E = ClassDecl->bases_end(); Base != E; ++Base) { 2167 // Bases are always records in a well-formed non-dependent class. 2168 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2169 2170 // Remember direct virtual bases. 2171 if (Base->isVirtual()) 2172 DirectVirtualBases.insert(RT); 2173 2174 // Ignore trivial destructors. 2175 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2176 if (BaseClassDecl->hasTrivialDestructor()) 2177 continue; 2178 2179 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2180 2181 // FIXME: caret should be on the start of the class name 2182 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2183 PDiag(diag::err_access_dtor_base) 2184 << Base->getType() 2185 << Base->getSourceRange()); 2186 2187 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2188 } 2189 2190 // Virtual bases. 2191 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2192 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2193 2194 // Bases are always records in a well-formed non-dependent class. 2195 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2196 2197 // Ignore direct virtual bases. 2198 if (DirectVirtualBases.count(RT)) 2199 continue; 2200 2201 // Ignore trivial destructors. 2202 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2203 if (BaseClassDecl->hasTrivialDestructor()) 2204 continue; 2205 2206 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2207 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2208 PDiag(diag::err_access_dtor_vbase) 2209 << VBase->getType()); 2210 2211 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2212 } 2213} 2214 2215void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2216 if (!CDtorDecl) 2217 return; 2218 2219 if (CXXConstructorDecl *Constructor 2220 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2221 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2222} 2223 2224bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2225 unsigned DiagID, AbstractDiagSelID SelID, 2226 const CXXRecordDecl *CurrentRD) { 2227 if (SelID == -1) 2228 return RequireNonAbstractType(Loc, T, 2229 PDiag(DiagID), CurrentRD); 2230 else 2231 return RequireNonAbstractType(Loc, T, 2232 PDiag(DiagID) << SelID, CurrentRD); 2233} 2234 2235bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2236 const PartialDiagnostic &PD, 2237 const CXXRecordDecl *CurrentRD) { 2238 if (!getLangOptions().CPlusPlus) 2239 return false; 2240 2241 if (const ArrayType *AT = Context.getAsArrayType(T)) 2242 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2243 CurrentRD); 2244 2245 if (const PointerType *PT = T->getAs<PointerType>()) { 2246 // Find the innermost pointer type. 2247 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2248 PT = T; 2249 2250 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2251 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2252 } 2253 2254 const RecordType *RT = T->getAs<RecordType>(); 2255 if (!RT) 2256 return false; 2257 2258 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2259 2260 if (CurrentRD && CurrentRD != RD) 2261 return false; 2262 2263 // FIXME: is this reasonable? It matches current behavior, but.... 2264 if (!RD->getDefinition()) 2265 return false; 2266 2267 if (!RD->isAbstract()) 2268 return false; 2269 2270 Diag(Loc, PD) << RD->getDeclName(); 2271 2272 // Check if we've already emitted the list of pure virtual functions for this 2273 // class. 2274 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2275 return true; 2276 2277 CXXFinalOverriderMap FinalOverriders; 2278 RD->getFinalOverriders(FinalOverriders); 2279 2280 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2281 MEnd = FinalOverriders.end(); 2282 M != MEnd; 2283 ++M) { 2284 for (OverridingMethods::iterator SO = M->second.begin(), 2285 SOEnd = M->second.end(); 2286 SO != SOEnd; ++SO) { 2287 // C++ [class.abstract]p4: 2288 // A class is abstract if it contains or inherits at least one 2289 // pure virtual function for which the final overrider is pure 2290 // virtual. 2291 2292 // 2293 if (SO->second.size() != 1) 2294 continue; 2295 2296 if (!SO->second.front().Method->isPure()) 2297 continue; 2298 2299 Diag(SO->second.front().Method->getLocation(), 2300 diag::note_pure_virtual_function) 2301 << SO->second.front().Method->getDeclName(); 2302 } 2303 } 2304 2305 if (!PureVirtualClassDiagSet) 2306 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2307 PureVirtualClassDiagSet->insert(RD); 2308 2309 return true; 2310} 2311 2312namespace { 2313 class AbstractClassUsageDiagnoser 2314 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2315 Sema &SemaRef; 2316 CXXRecordDecl *AbstractClass; 2317 2318 bool VisitDeclContext(const DeclContext *DC) { 2319 bool Invalid = false; 2320 2321 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2322 E = DC->decls_end(); I != E; ++I) 2323 Invalid |= Visit(*I); 2324 2325 return Invalid; 2326 } 2327 2328 public: 2329 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2330 : SemaRef(SemaRef), AbstractClass(ac) { 2331 Visit(SemaRef.Context.getTranslationUnitDecl()); 2332 } 2333 2334 bool VisitFunctionDecl(const FunctionDecl *FD) { 2335 if (FD->isThisDeclarationADefinition()) { 2336 // No need to do the check if we're in a definition, because it requires 2337 // that the return/param types are complete. 2338 // because that requires 2339 return VisitDeclContext(FD); 2340 } 2341 2342 // Check the return type. 2343 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2344 bool Invalid = 2345 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2346 diag::err_abstract_type_in_decl, 2347 Sema::AbstractReturnType, 2348 AbstractClass); 2349 2350 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2351 E = FD->param_end(); I != E; ++I) { 2352 const ParmVarDecl *VD = *I; 2353 Invalid |= 2354 SemaRef.RequireNonAbstractType(VD->getLocation(), 2355 VD->getOriginalType(), 2356 diag::err_abstract_type_in_decl, 2357 Sema::AbstractParamType, 2358 AbstractClass); 2359 } 2360 2361 return Invalid; 2362 } 2363 2364 bool VisitDecl(const Decl* D) { 2365 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2366 return VisitDeclContext(DC); 2367 2368 return false; 2369 } 2370 }; 2371} 2372 2373/// \brief Perform semantic checks on a class definition that has been 2374/// completing, introducing implicitly-declared members, checking for 2375/// abstract types, etc. 2376void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { 2377 if (!Record || Record->isInvalidDecl()) 2378 return; 2379 2380 if (!Record->isDependentType()) 2381 AddImplicitlyDeclaredMembersToClass(S, Record); 2382 2383 if (Record->isInvalidDecl()) 2384 return; 2385 2386 // Set access bits correctly on the directly-declared conversions. 2387 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2388 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2389 Convs->setAccess(I, (*I)->getAccess()); 2390 2391 // Determine whether we need to check for final overriders. We do 2392 // this either when there are virtual base classes (in which case we 2393 // may end up finding multiple final overriders for a given virtual 2394 // function) or any of the base classes is abstract (in which case 2395 // we might detect that this class is abstract). 2396 bool CheckFinalOverriders = false; 2397 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2398 !Record->isDependentType()) { 2399 if (Record->getNumVBases()) 2400 CheckFinalOverriders = true; 2401 else if (!Record->isAbstract()) { 2402 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2403 BEnd = Record->bases_end(); 2404 B != BEnd; ++B) { 2405 CXXRecordDecl *BaseDecl 2406 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2407 if (BaseDecl->isAbstract()) { 2408 CheckFinalOverriders = true; 2409 break; 2410 } 2411 } 2412 } 2413 } 2414 2415 if (CheckFinalOverriders) { 2416 CXXFinalOverriderMap FinalOverriders; 2417 Record->getFinalOverriders(FinalOverriders); 2418 2419 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2420 MEnd = FinalOverriders.end(); 2421 M != MEnd; ++M) { 2422 for (OverridingMethods::iterator SO = M->second.begin(), 2423 SOEnd = M->second.end(); 2424 SO != SOEnd; ++SO) { 2425 assert(SO->second.size() > 0 && 2426 "All virtual functions have overridding virtual functions"); 2427 if (SO->second.size() == 1) { 2428 // C++ [class.abstract]p4: 2429 // A class is abstract if it contains or inherits at least one 2430 // pure virtual function for which the final overrider is pure 2431 // virtual. 2432 if (SO->second.front().Method->isPure()) 2433 Record->setAbstract(true); 2434 continue; 2435 } 2436 2437 // C++ [class.virtual]p2: 2438 // In a derived class, if a virtual member function of a base 2439 // class subobject has more than one final overrider the 2440 // program is ill-formed. 2441 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2442 << (NamedDecl *)M->first << Record; 2443 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2444 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2445 OMEnd = SO->second.end(); 2446 OM != OMEnd; ++OM) 2447 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2448 << (NamedDecl *)M->first << OM->Method->getParent(); 2449 2450 Record->setInvalidDecl(); 2451 } 2452 } 2453 } 2454 2455 if (Record->isAbstract() && !Record->isInvalidDecl()) 2456 (void)AbstractClassUsageDiagnoser(*this, Record); 2457 2458 // If this is not an aggregate type and has no user-declared constructor, 2459 // complain about any non-static data members of reference or const scalar 2460 // type, since they will never get initializers. 2461 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2462 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2463 bool Complained = false; 2464 for (RecordDecl::field_iterator F = Record->field_begin(), 2465 FEnd = Record->field_end(); 2466 F != FEnd; ++F) { 2467 if (F->getType()->isReferenceType() || 2468 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2469 if (!Complained) { 2470 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2471 << Record->getTagKind() << Record; 2472 Complained = true; 2473 } 2474 2475 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2476 << F->getType()->isReferenceType() 2477 << F->getDeclName(); 2478 } 2479 } 2480 } 2481 2482 if (Record->isDynamicClass()) 2483 DynamicClasses.push_back(Record); 2484} 2485 2486void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2487 DeclPtrTy TagDecl, 2488 SourceLocation LBrac, 2489 SourceLocation RBrac, 2490 AttributeList *AttrList) { 2491 if (!TagDecl) 2492 return; 2493 2494 AdjustDeclIfTemplate(TagDecl); 2495 2496 ActOnFields(S, RLoc, TagDecl, 2497 (DeclPtrTy*)FieldCollector->getCurFields(), 2498 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2499 2500 CheckCompletedCXXClass(S, 2501 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2502} 2503 2504/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2505/// special functions, such as the default constructor, copy 2506/// constructor, or destructor, to the given C++ class (C++ 2507/// [special]p1). This routine can only be executed just before the 2508/// definition of the class is complete. 2509/// 2510/// The scope, if provided, is the class scope. 2511void Sema::AddImplicitlyDeclaredMembersToClass(Scope *S, 2512 CXXRecordDecl *ClassDecl) { 2513 CanQualType ClassType 2514 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2515 2516 // FIXME: Implicit declarations have exception specifications, which are 2517 // the union of the specifications of the implicitly called functions. 2518 2519 if (!ClassDecl->hasUserDeclaredConstructor()) { 2520 // C++ [class.ctor]p5: 2521 // A default constructor for a class X is a constructor of class X 2522 // that can be called without an argument. If there is no 2523 // user-declared constructor for class X, a default constructor is 2524 // implicitly declared. An implicitly-declared default constructor 2525 // is an inline public member of its class. 2526 DeclarationName Name 2527 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2528 CXXConstructorDecl *DefaultCon = 2529 CXXConstructorDecl::Create(Context, ClassDecl, 2530 ClassDecl->getLocation(), Name, 2531 Context.getFunctionType(Context.VoidTy, 2532 0, 0, false, 0, 2533 /*FIXME*/false, false, 2534 0, 0, 2535 FunctionType::ExtInfo()), 2536 /*TInfo=*/0, 2537 /*isExplicit=*/false, 2538 /*isInline=*/true, 2539 /*isImplicitlyDeclared=*/true); 2540 DefaultCon->setAccess(AS_public); 2541 DefaultCon->setImplicit(); 2542 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2543 if (S) 2544 PushOnScopeChains(DefaultCon, S, true); 2545 else 2546 ClassDecl->addDecl(DefaultCon); 2547 } 2548 2549 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2550 // C++ [class.copy]p4: 2551 // If the class definition does not explicitly declare a copy 2552 // constructor, one is declared implicitly. 2553 2554 // C++ [class.copy]p5: 2555 // The implicitly-declared copy constructor for a class X will 2556 // have the form 2557 // 2558 // X::X(const X&) 2559 // 2560 // if 2561 bool HasConstCopyConstructor = true; 2562 2563 // -- each direct or virtual base class B of X has a copy 2564 // constructor whose first parameter is of type const B& or 2565 // const volatile B&, and 2566 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2567 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2568 const CXXRecordDecl *BaseClassDecl 2569 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2570 HasConstCopyConstructor 2571 = BaseClassDecl->hasConstCopyConstructor(Context); 2572 } 2573 2574 // -- for all the nonstatic data members of X that are of a 2575 // class type M (or array thereof), each such class type 2576 // has a copy constructor whose first parameter is of type 2577 // const M& or const volatile M&. 2578 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2579 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2580 ++Field) { 2581 QualType FieldType = (*Field)->getType(); 2582 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2583 FieldType = Array->getElementType(); 2584 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2585 const CXXRecordDecl *FieldClassDecl 2586 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2587 HasConstCopyConstructor 2588 = FieldClassDecl->hasConstCopyConstructor(Context); 2589 } 2590 } 2591 2592 // Otherwise, the implicitly declared copy constructor will have 2593 // the form 2594 // 2595 // X::X(X&) 2596 QualType ArgType = ClassType; 2597 if (HasConstCopyConstructor) 2598 ArgType = ArgType.withConst(); 2599 ArgType = Context.getLValueReferenceType(ArgType); 2600 2601 // An implicitly-declared copy constructor is an inline public 2602 // member of its class. 2603 DeclarationName Name 2604 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2605 CXXConstructorDecl *CopyConstructor 2606 = CXXConstructorDecl::Create(Context, ClassDecl, 2607 ClassDecl->getLocation(), Name, 2608 Context.getFunctionType(Context.VoidTy, 2609 &ArgType, 1, 2610 false, 0, 2611 /*FIXME: hasExceptionSpec*/false, 2612 false, 0, 0, 2613 FunctionType::ExtInfo()), 2614 /*TInfo=*/0, 2615 /*isExplicit=*/false, 2616 /*isInline=*/true, 2617 /*isImplicitlyDeclared=*/true); 2618 CopyConstructor->setAccess(AS_public); 2619 CopyConstructor->setImplicit(); 2620 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2621 2622 // Add the parameter to the constructor. 2623 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2624 ClassDecl->getLocation(), 2625 /*IdentifierInfo=*/0, 2626 ArgType, /*TInfo=*/0, 2627 VarDecl::None, 2628 VarDecl::None, 0); 2629 CopyConstructor->setParams(&FromParam, 1); 2630 if (S) 2631 PushOnScopeChains(CopyConstructor, S, true); 2632 else 2633 ClassDecl->addDecl(CopyConstructor); 2634 } 2635 2636 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2637 // Note: The following rules are largely analoguous to the copy 2638 // constructor rules. Note that virtual bases are not taken into account 2639 // for determining the argument type of the operator. Note also that 2640 // operators taking an object instead of a reference are allowed. 2641 // 2642 // C++ [class.copy]p10: 2643 // If the class definition does not explicitly declare a copy 2644 // assignment operator, one is declared implicitly. 2645 // The implicitly-defined copy assignment operator for a class X 2646 // will have the form 2647 // 2648 // X& X::operator=(const X&) 2649 // 2650 // if 2651 bool HasConstCopyAssignment = true; 2652 2653 // -- each direct base class B of X has a copy assignment operator 2654 // whose parameter is of type const B&, const volatile B& or B, 2655 // and 2656 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2657 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2658 assert(!Base->getType()->isDependentType() && 2659 "Cannot generate implicit members for class with dependent bases."); 2660 const CXXRecordDecl *BaseClassDecl 2661 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2662 const CXXMethodDecl *MD = 0; 2663 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2664 MD); 2665 } 2666 2667 // -- for all the nonstatic data members of X that are of a class 2668 // type M (or array thereof), each such class type has a copy 2669 // assignment operator whose parameter is of type const M&, 2670 // const volatile M& or M. 2671 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2672 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2673 ++Field) { 2674 QualType FieldType = (*Field)->getType(); 2675 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2676 FieldType = Array->getElementType(); 2677 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2678 const CXXRecordDecl *FieldClassDecl 2679 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2680 const CXXMethodDecl *MD = 0; 2681 HasConstCopyAssignment 2682 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2683 } 2684 } 2685 2686 // Otherwise, the implicitly declared copy assignment operator will 2687 // have the form 2688 // 2689 // X& X::operator=(X&) 2690 QualType ArgType = ClassType; 2691 QualType RetType = Context.getLValueReferenceType(ArgType); 2692 if (HasConstCopyAssignment) 2693 ArgType = ArgType.withConst(); 2694 ArgType = Context.getLValueReferenceType(ArgType); 2695 2696 // An implicitly-declared copy assignment operator is an inline public 2697 // member of its class. 2698 DeclarationName Name = 2699 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2700 CXXMethodDecl *CopyAssignment = 2701 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2702 Context.getFunctionType(RetType, &ArgType, 1, 2703 false, 0, 2704 /*FIXME: hasExceptionSpec*/false, 2705 false, 0, 0, 2706 FunctionType::ExtInfo()), 2707 /*TInfo=*/0, /*isStatic=*/false, 2708 /*StorageClassAsWritten=*/FunctionDecl::None, 2709 /*isInline=*/true); 2710 CopyAssignment->setAccess(AS_public); 2711 CopyAssignment->setImplicit(); 2712 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2713 CopyAssignment->setCopyAssignment(true); 2714 2715 // Add the parameter to the operator. 2716 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2717 ClassDecl->getLocation(), 2718 /*Id=*/0, 2719 ArgType, /*TInfo=*/0, 2720 VarDecl::None, 2721 VarDecl::None, 0); 2722 CopyAssignment->setParams(&FromParam, 1); 2723 2724 // Don't call addedAssignmentOperator. There is no way to distinguish an 2725 // implicit from an explicit assignment operator. 2726 if (S) 2727 PushOnScopeChains(CopyAssignment, S, true); 2728 else 2729 ClassDecl->addDecl(CopyAssignment); 2730 AddOverriddenMethods(ClassDecl, CopyAssignment); 2731 } 2732 2733 if (!ClassDecl->hasUserDeclaredDestructor()) { 2734 // C++ [class.dtor]p2: 2735 // If a class has no user-declared destructor, a destructor is 2736 // declared implicitly. An implicitly-declared destructor is an 2737 // inline public member of its class. 2738 QualType Ty = Context.getFunctionType(Context.VoidTy, 2739 0, 0, false, 0, 2740 /*FIXME: hasExceptionSpec*/false, 2741 false, 0, 0, FunctionType::ExtInfo()); 2742 2743 DeclarationName Name 2744 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2745 CXXDestructorDecl *Destructor 2746 = CXXDestructorDecl::Create(Context, ClassDecl, 2747 ClassDecl->getLocation(), Name, Ty, 2748 /*isInline=*/true, 2749 /*isImplicitlyDeclared=*/true); 2750 Destructor->setAccess(AS_public); 2751 Destructor->setImplicit(); 2752 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2753 if (S) 2754 PushOnScopeChains(Destructor, S, true); 2755 else 2756 ClassDecl->addDecl(Destructor); 2757 2758 // This could be uniqued if it ever proves significant. 2759 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2760 2761 AddOverriddenMethods(ClassDecl, Destructor); 2762 } 2763} 2764 2765void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2766 Decl *D = TemplateD.getAs<Decl>(); 2767 if (!D) 2768 return; 2769 2770 TemplateParameterList *Params = 0; 2771 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2772 Params = Template->getTemplateParameters(); 2773 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2774 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2775 Params = PartialSpec->getTemplateParameters(); 2776 else 2777 return; 2778 2779 for (TemplateParameterList::iterator Param = Params->begin(), 2780 ParamEnd = Params->end(); 2781 Param != ParamEnd; ++Param) { 2782 NamedDecl *Named = cast<NamedDecl>(*Param); 2783 if (Named->getDeclName()) { 2784 S->AddDecl(DeclPtrTy::make(Named)); 2785 IdResolver.AddDecl(Named); 2786 } 2787 } 2788} 2789 2790void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2791 if (!RecordD) return; 2792 AdjustDeclIfTemplate(RecordD); 2793 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2794 PushDeclContext(S, Record); 2795} 2796 2797void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2798 if (!RecordD) return; 2799 PopDeclContext(); 2800} 2801 2802/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2803/// parsing a top-level (non-nested) C++ class, and we are now 2804/// parsing those parts of the given Method declaration that could 2805/// not be parsed earlier (C++ [class.mem]p2), such as default 2806/// arguments. This action should enter the scope of the given 2807/// Method declaration as if we had just parsed the qualified method 2808/// name. However, it should not bring the parameters into scope; 2809/// that will be performed by ActOnDelayedCXXMethodParameter. 2810void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2811} 2812 2813/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2814/// C++ method declaration. We're (re-)introducing the given 2815/// function parameter into scope for use in parsing later parts of 2816/// the method declaration. For example, we could see an 2817/// ActOnParamDefaultArgument event for this parameter. 2818void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2819 if (!ParamD) 2820 return; 2821 2822 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2823 2824 // If this parameter has an unparsed default argument, clear it out 2825 // to make way for the parsed default argument. 2826 if (Param->hasUnparsedDefaultArg()) 2827 Param->setDefaultArg(0); 2828 2829 S->AddDecl(DeclPtrTy::make(Param)); 2830 if (Param->getDeclName()) 2831 IdResolver.AddDecl(Param); 2832} 2833 2834/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2835/// processing the delayed method declaration for Method. The method 2836/// declaration is now considered finished. There may be a separate 2837/// ActOnStartOfFunctionDef action later (not necessarily 2838/// immediately!) for this method, if it was also defined inside the 2839/// class body. 2840void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2841 if (!MethodD) 2842 return; 2843 2844 AdjustDeclIfTemplate(MethodD); 2845 2846 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2847 2848 // Now that we have our default arguments, check the constructor 2849 // again. It could produce additional diagnostics or affect whether 2850 // the class has implicitly-declared destructors, among other 2851 // things. 2852 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2853 CheckConstructor(Constructor); 2854 2855 // Check the default arguments, which we may have added. 2856 if (!Method->isInvalidDecl()) 2857 CheckCXXDefaultArguments(Method); 2858} 2859 2860/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2861/// the well-formedness of the constructor declarator @p D with type @p 2862/// R. If there are any errors in the declarator, this routine will 2863/// emit diagnostics and set the invalid bit to true. In any case, the type 2864/// will be updated to reflect a well-formed type for the constructor and 2865/// returned. 2866QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2867 FunctionDecl::StorageClass &SC) { 2868 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2869 2870 // C++ [class.ctor]p3: 2871 // A constructor shall not be virtual (10.3) or static (9.4). A 2872 // constructor can be invoked for a const, volatile or const 2873 // volatile object. A constructor shall not be declared const, 2874 // volatile, or const volatile (9.3.2). 2875 if (isVirtual) { 2876 if (!D.isInvalidType()) 2877 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2878 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2879 << SourceRange(D.getIdentifierLoc()); 2880 D.setInvalidType(); 2881 } 2882 if (SC == FunctionDecl::Static) { 2883 if (!D.isInvalidType()) 2884 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2885 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2886 << SourceRange(D.getIdentifierLoc()); 2887 D.setInvalidType(); 2888 SC = FunctionDecl::None; 2889 } 2890 2891 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2892 if (FTI.TypeQuals != 0) { 2893 if (FTI.TypeQuals & Qualifiers::Const) 2894 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2895 << "const" << SourceRange(D.getIdentifierLoc()); 2896 if (FTI.TypeQuals & Qualifiers::Volatile) 2897 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2898 << "volatile" << SourceRange(D.getIdentifierLoc()); 2899 if (FTI.TypeQuals & Qualifiers::Restrict) 2900 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2901 << "restrict" << SourceRange(D.getIdentifierLoc()); 2902 } 2903 2904 // Rebuild the function type "R" without any type qualifiers (in 2905 // case any of the errors above fired) and with "void" as the 2906 // return type, since constructors don't have return types. We 2907 // *always* have to do this, because GetTypeForDeclarator will 2908 // put in a result type of "int" when none was specified. 2909 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2910 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2911 Proto->getNumArgs(), 2912 Proto->isVariadic(), 0, 2913 Proto->hasExceptionSpec(), 2914 Proto->hasAnyExceptionSpec(), 2915 Proto->getNumExceptions(), 2916 Proto->exception_begin(), 2917 Proto->getExtInfo()); 2918} 2919 2920/// CheckConstructor - Checks a fully-formed constructor for 2921/// well-formedness, issuing any diagnostics required. Returns true if 2922/// the constructor declarator is invalid. 2923void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2924 CXXRecordDecl *ClassDecl 2925 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2926 if (!ClassDecl) 2927 return Constructor->setInvalidDecl(); 2928 2929 // C++ [class.copy]p3: 2930 // A declaration of a constructor for a class X is ill-formed if 2931 // its first parameter is of type (optionally cv-qualified) X and 2932 // either there are no other parameters or else all other 2933 // parameters have default arguments. 2934 if (!Constructor->isInvalidDecl() && 2935 ((Constructor->getNumParams() == 1) || 2936 (Constructor->getNumParams() > 1 && 2937 Constructor->getParamDecl(1)->hasDefaultArg())) && 2938 Constructor->getTemplateSpecializationKind() 2939 != TSK_ImplicitInstantiation) { 2940 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2941 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2942 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2943 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2944 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2945 << FixItHint::CreateInsertion(ParamLoc, " const &"); 2946 2947 // FIXME: Rather that making the constructor invalid, we should endeavor 2948 // to fix the type. 2949 Constructor->setInvalidDecl(); 2950 } 2951 } 2952 2953 // Notify the class that we've added a constructor. In principle we 2954 // don't need to do this for out-of-line declarations; in practice 2955 // we only instantiate the most recent declaration of a method, so 2956 // we have to call this for everything but friends. 2957 if (!Constructor->getFriendObjectKind()) 2958 ClassDecl->addedConstructor(Context, Constructor); 2959} 2960 2961/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2962/// issuing any diagnostics required. Returns true on error. 2963bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2964 CXXRecordDecl *RD = Destructor->getParent(); 2965 2966 if (Destructor->isVirtual()) { 2967 SourceLocation Loc; 2968 2969 if (!Destructor->isImplicit()) 2970 Loc = Destructor->getLocation(); 2971 else 2972 Loc = RD->getLocation(); 2973 2974 // If we have a virtual destructor, look up the deallocation function 2975 FunctionDecl *OperatorDelete = 0; 2976 DeclarationName Name = 2977 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2978 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2979 return true; 2980 2981 Destructor->setOperatorDelete(OperatorDelete); 2982 } 2983 2984 return false; 2985} 2986 2987static inline bool 2988FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2989 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2990 FTI.ArgInfo[0].Param && 2991 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2992} 2993 2994/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2995/// the well-formednes of the destructor declarator @p D with type @p 2996/// R. If there are any errors in the declarator, this routine will 2997/// emit diagnostics and set the declarator to invalid. Even if this happens, 2998/// will be updated to reflect a well-formed type for the destructor and 2999/// returned. 3000QualType Sema::CheckDestructorDeclarator(Declarator &D, 3001 FunctionDecl::StorageClass& SC) { 3002 // C++ [class.dtor]p1: 3003 // [...] A typedef-name that names a class is a class-name 3004 // (7.1.3); however, a typedef-name that names a class shall not 3005 // be used as the identifier in the declarator for a destructor 3006 // declaration. 3007 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3008 if (isa<TypedefType>(DeclaratorType)) { 3009 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3010 << DeclaratorType; 3011 D.setInvalidType(); 3012 } 3013 3014 // C++ [class.dtor]p2: 3015 // A destructor is used to destroy objects of its class type. A 3016 // destructor takes no parameters, and no return type can be 3017 // specified for it (not even void). The address of a destructor 3018 // shall not be taken. A destructor shall not be static. A 3019 // destructor can be invoked for a const, volatile or const 3020 // volatile object. A destructor shall not be declared const, 3021 // volatile or const volatile (9.3.2). 3022 if (SC == FunctionDecl::Static) { 3023 if (!D.isInvalidType()) 3024 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3025 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3026 << SourceRange(D.getIdentifierLoc()); 3027 SC = FunctionDecl::None; 3028 D.setInvalidType(); 3029 } 3030 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3031 // Destructors don't have return types, but the parser will 3032 // happily parse something like: 3033 // 3034 // class X { 3035 // float ~X(); 3036 // }; 3037 // 3038 // The return type will be eliminated later. 3039 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3040 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3041 << SourceRange(D.getIdentifierLoc()); 3042 } 3043 3044 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3045 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3046 if (FTI.TypeQuals & Qualifiers::Const) 3047 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3048 << "const" << SourceRange(D.getIdentifierLoc()); 3049 if (FTI.TypeQuals & Qualifiers::Volatile) 3050 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3051 << "volatile" << SourceRange(D.getIdentifierLoc()); 3052 if (FTI.TypeQuals & Qualifiers::Restrict) 3053 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3054 << "restrict" << SourceRange(D.getIdentifierLoc()); 3055 D.setInvalidType(); 3056 } 3057 3058 // Make sure we don't have any parameters. 3059 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3060 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3061 3062 // Delete the parameters. 3063 FTI.freeArgs(); 3064 D.setInvalidType(); 3065 } 3066 3067 // Make sure the destructor isn't variadic. 3068 if (FTI.isVariadic) { 3069 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3070 D.setInvalidType(); 3071 } 3072 3073 // Rebuild the function type "R" without any type qualifiers or 3074 // parameters (in case any of the errors above fired) and with 3075 // "void" as the return type, since destructors don't have return 3076 // types. We *always* have to do this, because GetTypeForDeclarator 3077 // will put in a result type of "int" when none was specified. 3078 // FIXME: Exceptions! 3079 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3080 false, false, 0, 0, FunctionType::ExtInfo()); 3081} 3082 3083/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3084/// well-formednes of the conversion function declarator @p D with 3085/// type @p R. If there are any errors in the declarator, this routine 3086/// will emit diagnostics and return true. Otherwise, it will return 3087/// false. Either way, the type @p R will be updated to reflect a 3088/// well-formed type for the conversion operator. 3089void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3090 FunctionDecl::StorageClass& SC) { 3091 // C++ [class.conv.fct]p1: 3092 // Neither parameter types nor return type can be specified. The 3093 // type of a conversion function (8.3.5) is "function taking no 3094 // parameter returning conversion-type-id." 3095 if (SC == FunctionDecl::Static) { 3096 if (!D.isInvalidType()) 3097 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3098 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3099 << SourceRange(D.getIdentifierLoc()); 3100 D.setInvalidType(); 3101 SC = FunctionDecl::None; 3102 } 3103 3104 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3105 3106 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3107 // Conversion functions don't have return types, but the parser will 3108 // happily parse something like: 3109 // 3110 // class X { 3111 // float operator bool(); 3112 // }; 3113 // 3114 // The return type will be changed later anyway. 3115 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3116 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3117 << SourceRange(D.getIdentifierLoc()); 3118 D.setInvalidType(); 3119 } 3120 3121 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3122 3123 // Make sure we don't have any parameters. 3124 if (Proto->getNumArgs() > 0) { 3125 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3126 3127 // Delete the parameters. 3128 D.getTypeObject(0).Fun.freeArgs(); 3129 D.setInvalidType(); 3130 } else if (Proto->isVariadic()) { 3131 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3132 D.setInvalidType(); 3133 } 3134 3135 // Diagnose "&operator bool()" and other such nonsense. This 3136 // is actually a gcc extension which we don't support. 3137 if (Proto->getResultType() != ConvType) { 3138 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3139 << Proto->getResultType(); 3140 D.setInvalidType(); 3141 ConvType = Proto->getResultType(); 3142 } 3143 3144 // C++ [class.conv.fct]p4: 3145 // The conversion-type-id shall not represent a function type nor 3146 // an array type. 3147 if (ConvType->isArrayType()) { 3148 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3149 ConvType = Context.getPointerType(ConvType); 3150 D.setInvalidType(); 3151 } else if (ConvType->isFunctionType()) { 3152 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3153 ConvType = Context.getPointerType(ConvType); 3154 D.setInvalidType(); 3155 } 3156 3157 // Rebuild the function type "R" without any parameters (in case any 3158 // of the errors above fired) and with the conversion type as the 3159 // return type. 3160 if (D.isInvalidType()) { 3161 R = Context.getFunctionType(ConvType, 0, 0, false, 3162 Proto->getTypeQuals(), 3163 Proto->hasExceptionSpec(), 3164 Proto->hasAnyExceptionSpec(), 3165 Proto->getNumExceptions(), 3166 Proto->exception_begin(), 3167 Proto->getExtInfo()); 3168 } 3169 3170 // C++0x explicit conversion operators. 3171 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3172 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3173 diag::warn_explicit_conversion_functions) 3174 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3175} 3176 3177/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3178/// the declaration of the given C++ conversion function. This routine 3179/// is responsible for recording the conversion function in the C++ 3180/// class, if possible. 3181Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3182 assert(Conversion && "Expected to receive a conversion function declaration"); 3183 3184 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3185 3186 // Make sure we aren't redeclaring the conversion function. 3187 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3188 3189 // C++ [class.conv.fct]p1: 3190 // [...] A conversion function is never used to convert a 3191 // (possibly cv-qualified) object to the (possibly cv-qualified) 3192 // same object type (or a reference to it), to a (possibly 3193 // cv-qualified) base class of that type (or a reference to it), 3194 // or to (possibly cv-qualified) void. 3195 // FIXME: Suppress this warning if the conversion function ends up being a 3196 // virtual function that overrides a virtual function in a base class. 3197 QualType ClassType 3198 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3199 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3200 ConvType = ConvTypeRef->getPointeeType(); 3201 if (ConvType->isRecordType()) { 3202 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3203 if (ConvType == ClassType) 3204 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3205 << ClassType; 3206 else if (IsDerivedFrom(ClassType, ConvType)) 3207 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3208 << ClassType << ConvType; 3209 } else if (ConvType->isVoidType()) { 3210 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3211 << ClassType << ConvType; 3212 } 3213 3214 if (Conversion->getPrimaryTemplate()) { 3215 // ignore specializations 3216 } else if (Conversion->getPreviousDeclaration()) { 3217 if (FunctionTemplateDecl *ConversionTemplate 3218 = Conversion->getDescribedFunctionTemplate()) { 3219 if (ClassDecl->replaceConversion( 3220 ConversionTemplate->getPreviousDeclaration(), 3221 ConversionTemplate)) 3222 return DeclPtrTy::make(ConversionTemplate); 3223 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3224 Conversion)) 3225 return DeclPtrTy::make(Conversion); 3226 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3227 } else if (FunctionTemplateDecl *ConversionTemplate 3228 = Conversion->getDescribedFunctionTemplate()) 3229 ClassDecl->addConversionFunction(ConversionTemplate); 3230 else 3231 ClassDecl->addConversionFunction(Conversion); 3232 3233 return DeclPtrTy::make(Conversion); 3234} 3235 3236//===----------------------------------------------------------------------===// 3237// Namespace Handling 3238//===----------------------------------------------------------------------===// 3239 3240/// ActOnStartNamespaceDef - This is called at the start of a namespace 3241/// definition. 3242Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3243 SourceLocation IdentLoc, 3244 IdentifierInfo *II, 3245 SourceLocation LBrace, 3246 AttributeList *AttrList) { 3247 NamespaceDecl *Namespc = 3248 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3249 Namespc->setLBracLoc(LBrace); 3250 3251 Scope *DeclRegionScope = NamespcScope->getParent(); 3252 3253 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3254 3255 if (II) { 3256 // C++ [namespace.def]p2: 3257 // The identifier in an original-namespace-definition shall not have been 3258 // previously defined in the declarative region in which the 3259 // original-namespace-definition appears. The identifier in an 3260 // original-namespace-definition is the name of the namespace. Subsequently 3261 // in that declarative region, it is treated as an original-namespace-name. 3262 3263 NamedDecl *PrevDecl 3264 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3265 ForRedeclaration); 3266 3267 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3268 // This is an extended namespace definition. 3269 // Attach this namespace decl to the chain of extended namespace 3270 // definitions. 3271 OrigNS->setNextNamespace(Namespc); 3272 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3273 3274 // Remove the previous declaration from the scope. 3275 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3276 IdResolver.RemoveDecl(OrigNS); 3277 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3278 } 3279 } else if (PrevDecl) { 3280 // This is an invalid name redefinition. 3281 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3282 << Namespc->getDeclName(); 3283 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3284 Namespc->setInvalidDecl(); 3285 // Continue on to push Namespc as current DeclContext and return it. 3286 } else if (II->isStr("std") && 3287 CurContext->getLookupContext()->isTranslationUnit()) { 3288 // This is the first "real" definition of the namespace "std", so update 3289 // our cache of the "std" namespace to point at this definition. 3290 if (StdNamespace) { 3291 // We had already defined a dummy namespace "std". Link this new 3292 // namespace definition to the dummy namespace "std". 3293 StdNamespace->setNextNamespace(Namespc); 3294 StdNamespace->setLocation(IdentLoc); 3295 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3296 } 3297 3298 // Make our StdNamespace cache point at the first real definition of the 3299 // "std" namespace. 3300 StdNamespace = Namespc; 3301 } 3302 3303 PushOnScopeChains(Namespc, DeclRegionScope); 3304 } else { 3305 // Anonymous namespaces. 3306 assert(Namespc->isAnonymousNamespace()); 3307 3308 // Link the anonymous namespace into its parent. 3309 NamespaceDecl *PrevDecl; 3310 DeclContext *Parent = CurContext->getLookupContext(); 3311 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3312 PrevDecl = TU->getAnonymousNamespace(); 3313 TU->setAnonymousNamespace(Namespc); 3314 } else { 3315 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3316 PrevDecl = ND->getAnonymousNamespace(); 3317 ND->setAnonymousNamespace(Namespc); 3318 } 3319 3320 // Link the anonymous namespace with its previous declaration. 3321 if (PrevDecl) { 3322 assert(PrevDecl->isAnonymousNamespace()); 3323 assert(!PrevDecl->getNextNamespace()); 3324 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3325 PrevDecl->setNextNamespace(Namespc); 3326 } 3327 3328 CurContext->addDecl(Namespc); 3329 3330 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3331 // behaves as if it were replaced by 3332 // namespace unique { /* empty body */ } 3333 // using namespace unique; 3334 // namespace unique { namespace-body } 3335 // where all occurrences of 'unique' in a translation unit are 3336 // replaced by the same identifier and this identifier differs 3337 // from all other identifiers in the entire program. 3338 3339 // We just create the namespace with an empty name and then add an 3340 // implicit using declaration, just like the standard suggests. 3341 // 3342 // CodeGen enforces the "universally unique" aspect by giving all 3343 // declarations semantically contained within an anonymous 3344 // namespace internal linkage. 3345 3346 if (!PrevDecl) { 3347 UsingDirectiveDecl* UD 3348 = UsingDirectiveDecl::Create(Context, CurContext, 3349 /* 'using' */ LBrace, 3350 /* 'namespace' */ SourceLocation(), 3351 /* qualifier */ SourceRange(), 3352 /* NNS */ NULL, 3353 /* identifier */ SourceLocation(), 3354 Namespc, 3355 /* Ancestor */ CurContext); 3356 UD->setImplicit(); 3357 CurContext->addDecl(UD); 3358 } 3359 } 3360 3361 // Although we could have an invalid decl (i.e. the namespace name is a 3362 // redefinition), push it as current DeclContext and try to continue parsing. 3363 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3364 // for the namespace has the declarations that showed up in that particular 3365 // namespace definition. 3366 PushDeclContext(NamespcScope, Namespc); 3367 return DeclPtrTy::make(Namespc); 3368} 3369 3370/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3371/// is a namespace alias, returns the namespace it points to. 3372static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3373 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3374 return AD->getNamespace(); 3375 return dyn_cast_or_null<NamespaceDecl>(D); 3376} 3377 3378/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3379/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3380void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3381 Decl *Dcl = D.getAs<Decl>(); 3382 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3383 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3384 Namespc->setRBracLoc(RBrace); 3385 PopDeclContext(); 3386} 3387 3388Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3389 SourceLocation UsingLoc, 3390 SourceLocation NamespcLoc, 3391 CXXScopeSpec &SS, 3392 SourceLocation IdentLoc, 3393 IdentifierInfo *NamespcName, 3394 AttributeList *AttrList) { 3395 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3396 assert(NamespcName && "Invalid NamespcName."); 3397 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3398 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3399 3400 UsingDirectiveDecl *UDir = 0; 3401 3402 // Lookup namespace name. 3403 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3404 LookupParsedName(R, S, &SS); 3405 if (R.isAmbiguous()) 3406 return DeclPtrTy(); 3407 3408 if (!R.empty()) { 3409 NamedDecl *Named = R.getFoundDecl(); 3410 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3411 && "expected namespace decl"); 3412 // C++ [namespace.udir]p1: 3413 // A using-directive specifies that the names in the nominated 3414 // namespace can be used in the scope in which the 3415 // using-directive appears after the using-directive. During 3416 // unqualified name lookup (3.4.1), the names appear as if they 3417 // were declared in the nearest enclosing namespace which 3418 // contains both the using-directive and the nominated 3419 // namespace. [Note: in this context, "contains" means "contains 3420 // directly or indirectly". ] 3421 3422 // Find enclosing context containing both using-directive and 3423 // nominated namespace. 3424 NamespaceDecl *NS = getNamespaceDecl(Named); 3425 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3426 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3427 CommonAncestor = CommonAncestor->getParent(); 3428 3429 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3430 SS.getRange(), 3431 (NestedNameSpecifier *)SS.getScopeRep(), 3432 IdentLoc, Named, CommonAncestor); 3433 PushUsingDirective(S, UDir); 3434 } else { 3435 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3436 } 3437 3438 // FIXME: We ignore attributes for now. 3439 delete AttrList; 3440 return DeclPtrTy::make(UDir); 3441} 3442 3443void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3444 // If scope has associated entity, then using directive is at namespace 3445 // or translation unit scope. We add UsingDirectiveDecls, into 3446 // it's lookup structure. 3447 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3448 Ctx->addDecl(UDir); 3449 else 3450 // Otherwise it is block-sope. using-directives will affect lookup 3451 // only to the end of scope. 3452 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3453} 3454 3455 3456Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3457 AccessSpecifier AS, 3458 bool HasUsingKeyword, 3459 SourceLocation UsingLoc, 3460 CXXScopeSpec &SS, 3461 UnqualifiedId &Name, 3462 AttributeList *AttrList, 3463 bool IsTypeName, 3464 SourceLocation TypenameLoc) { 3465 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3466 3467 switch (Name.getKind()) { 3468 case UnqualifiedId::IK_Identifier: 3469 case UnqualifiedId::IK_OperatorFunctionId: 3470 case UnqualifiedId::IK_LiteralOperatorId: 3471 case UnqualifiedId::IK_ConversionFunctionId: 3472 break; 3473 3474 case UnqualifiedId::IK_ConstructorName: 3475 case UnqualifiedId::IK_ConstructorTemplateId: 3476 // C++0x inherited constructors. 3477 if (getLangOptions().CPlusPlus0x) break; 3478 3479 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3480 << SS.getRange(); 3481 return DeclPtrTy(); 3482 3483 case UnqualifiedId::IK_DestructorName: 3484 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3485 << SS.getRange(); 3486 return DeclPtrTy(); 3487 3488 case UnqualifiedId::IK_TemplateId: 3489 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3490 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3491 return DeclPtrTy(); 3492 } 3493 3494 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3495 if (!TargetName) 3496 return DeclPtrTy(); 3497 3498 // Warn about using declarations. 3499 // TODO: store that the declaration was written without 'using' and 3500 // talk about access decls instead of using decls in the 3501 // diagnostics. 3502 if (!HasUsingKeyword) { 3503 UsingLoc = Name.getSourceRange().getBegin(); 3504 3505 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3506 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3507 } 3508 3509 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3510 Name.getSourceRange().getBegin(), 3511 TargetName, AttrList, 3512 /* IsInstantiation */ false, 3513 IsTypeName, TypenameLoc); 3514 if (UD) 3515 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3516 3517 return DeclPtrTy::make(UD); 3518} 3519 3520/// Determines whether to create a using shadow decl for a particular 3521/// decl, given the set of decls existing prior to this using lookup. 3522bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3523 const LookupResult &Previous) { 3524 // Diagnose finding a decl which is not from a base class of the 3525 // current class. We do this now because there are cases where this 3526 // function will silently decide not to build a shadow decl, which 3527 // will pre-empt further diagnostics. 3528 // 3529 // We don't need to do this in C++0x because we do the check once on 3530 // the qualifier. 3531 // 3532 // FIXME: diagnose the following if we care enough: 3533 // struct A { int foo; }; 3534 // struct B : A { using A::foo; }; 3535 // template <class T> struct C : A {}; 3536 // template <class T> struct D : C<T> { using B::foo; } // <--- 3537 // This is invalid (during instantiation) in C++03 because B::foo 3538 // resolves to the using decl in B, which is not a base class of D<T>. 3539 // We can't diagnose it immediately because C<T> is an unknown 3540 // specialization. The UsingShadowDecl in D<T> then points directly 3541 // to A::foo, which will look well-formed when we instantiate. 3542 // The right solution is to not collapse the shadow-decl chain. 3543 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3544 DeclContext *OrigDC = Orig->getDeclContext(); 3545 3546 // Handle enums and anonymous structs. 3547 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3548 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3549 while (OrigRec->isAnonymousStructOrUnion()) 3550 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3551 3552 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3553 if (OrigDC == CurContext) { 3554 Diag(Using->getLocation(), 3555 diag::err_using_decl_nested_name_specifier_is_current_class) 3556 << Using->getNestedNameRange(); 3557 Diag(Orig->getLocation(), diag::note_using_decl_target); 3558 return true; 3559 } 3560 3561 Diag(Using->getNestedNameRange().getBegin(), 3562 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3563 << Using->getTargetNestedNameDecl() 3564 << cast<CXXRecordDecl>(CurContext) 3565 << Using->getNestedNameRange(); 3566 Diag(Orig->getLocation(), diag::note_using_decl_target); 3567 return true; 3568 } 3569 } 3570 3571 if (Previous.empty()) return false; 3572 3573 NamedDecl *Target = Orig; 3574 if (isa<UsingShadowDecl>(Target)) 3575 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3576 3577 // If the target happens to be one of the previous declarations, we 3578 // don't have a conflict. 3579 // 3580 // FIXME: but we might be increasing its access, in which case we 3581 // should redeclare it. 3582 NamedDecl *NonTag = 0, *Tag = 0; 3583 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3584 I != E; ++I) { 3585 NamedDecl *D = (*I)->getUnderlyingDecl(); 3586 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3587 return false; 3588 3589 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3590 } 3591 3592 if (Target->isFunctionOrFunctionTemplate()) { 3593 FunctionDecl *FD; 3594 if (isa<FunctionTemplateDecl>(Target)) 3595 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3596 else 3597 FD = cast<FunctionDecl>(Target); 3598 3599 NamedDecl *OldDecl = 0; 3600 switch (CheckOverload(FD, Previous, OldDecl)) { 3601 case Ovl_Overload: 3602 return false; 3603 3604 case Ovl_NonFunction: 3605 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3606 break; 3607 3608 // We found a decl with the exact signature. 3609 case Ovl_Match: 3610 if (isa<UsingShadowDecl>(OldDecl)) { 3611 // Silently ignore the possible conflict. 3612 return false; 3613 } 3614 3615 // If we're in a record, we want to hide the target, so we 3616 // return true (without a diagnostic) to tell the caller not to 3617 // build a shadow decl. 3618 if (CurContext->isRecord()) 3619 return true; 3620 3621 // If we're not in a record, this is an error. 3622 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3623 break; 3624 } 3625 3626 Diag(Target->getLocation(), diag::note_using_decl_target); 3627 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3628 return true; 3629 } 3630 3631 // Target is not a function. 3632 3633 if (isa<TagDecl>(Target)) { 3634 // No conflict between a tag and a non-tag. 3635 if (!Tag) return false; 3636 3637 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3638 Diag(Target->getLocation(), diag::note_using_decl_target); 3639 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3640 return true; 3641 } 3642 3643 // No conflict between a tag and a non-tag. 3644 if (!NonTag) return false; 3645 3646 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3647 Diag(Target->getLocation(), diag::note_using_decl_target); 3648 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3649 return true; 3650} 3651 3652/// Builds a shadow declaration corresponding to a 'using' declaration. 3653UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3654 UsingDecl *UD, 3655 NamedDecl *Orig) { 3656 3657 // If we resolved to another shadow declaration, just coalesce them. 3658 NamedDecl *Target = Orig; 3659 if (isa<UsingShadowDecl>(Target)) { 3660 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3661 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3662 } 3663 3664 UsingShadowDecl *Shadow 3665 = UsingShadowDecl::Create(Context, CurContext, 3666 UD->getLocation(), UD, Target); 3667 UD->addShadowDecl(Shadow); 3668 3669 if (S) 3670 PushOnScopeChains(Shadow, S); 3671 else 3672 CurContext->addDecl(Shadow); 3673 Shadow->setAccess(UD->getAccess()); 3674 3675 // Register it as a conversion if appropriate. 3676 if (Shadow->getDeclName().getNameKind() 3677 == DeclarationName::CXXConversionFunctionName) 3678 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3679 3680 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3681 Shadow->setInvalidDecl(); 3682 3683 return Shadow; 3684} 3685 3686/// Hides a using shadow declaration. This is required by the current 3687/// using-decl implementation when a resolvable using declaration in a 3688/// class is followed by a declaration which would hide or override 3689/// one or more of the using decl's targets; for example: 3690/// 3691/// struct Base { void foo(int); }; 3692/// struct Derived : Base { 3693/// using Base::foo; 3694/// void foo(int); 3695/// }; 3696/// 3697/// The governing language is C++03 [namespace.udecl]p12: 3698/// 3699/// When a using-declaration brings names from a base class into a 3700/// derived class scope, member functions in the derived class 3701/// override and/or hide member functions with the same name and 3702/// parameter types in a base class (rather than conflicting). 3703/// 3704/// There are two ways to implement this: 3705/// (1) optimistically create shadow decls when they're not hidden 3706/// by existing declarations, or 3707/// (2) don't create any shadow decls (or at least don't make them 3708/// visible) until we've fully parsed/instantiated the class. 3709/// The problem with (1) is that we might have to retroactively remove 3710/// a shadow decl, which requires several O(n) operations because the 3711/// decl structures are (very reasonably) not designed for removal. 3712/// (2) avoids this but is very fiddly and phase-dependent. 3713void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3714 if (Shadow->getDeclName().getNameKind() == 3715 DeclarationName::CXXConversionFunctionName) 3716 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3717 3718 // Remove it from the DeclContext... 3719 Shadow->getDeclContext()->removeDecl(Shadow); 3720 3721 // ...and the scope, if applicable... 3722 if (S) { 3723 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3724 IdResolver.RemoveDecl(Shadow); 3725 } 3726 3727 // ...and the using decl. 3728 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3729 3730 // TODO: complain somehow if Shadow was used. It shouldn't 3731 // be possible for this to happen, because...? 3732} 3733 3734/// Builds a using declaration. 3735/// 3736/// \param IsInstantiation - Whether this call arises from an 3737/// instantiation of an unresolved using declaration. We treat 3738/// the lookup differently for these declarations. 3739NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3740 SourceLocation UsingLoc, 3741 CXXScopeSpec &SS, 3742 SourceLocation IdentLoc, 3743 DeclarationName Name, 3744 AttributeList *AttrList, 3745 bool IsInstantiation, 3746 bool IsTypeName, 3747 SourceLocation TypenameLoc) { 3748 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3749 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3750 3751 // FIXME: We ignore attributes for now. 3752 delete AttrList; 3753 3754 if (SS.isEmpty()) { 3755 Diag(IdentLoc, diag::err_using_requires_qualname); 3756 return 0; 3757 } 3758 3759 // Do the redeclaration lookup in the current scope. 3760 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3761 ForRedeclaration); 3762 Previous.setHideTags(false); 3763 if (S) { 3764 LookupName(Previous, S); 3765 3766 // It is really dumb that we have to do this. 3767 LookupResult::Filter F = Previous.makeFilter(); 3768 while (F.hasNext()) { 3769 NamedDecl *D = F.next(); 3770 if (!isDeclInScope(D, CurContext, S)) 3771 F.erase(); 3772 } 3773 F.done(); 3774 } else { 3775 assert(IsInstantiation && "no scope in non-instantiation"); 3776 assert(CurContext->isRecord() && "scope not record in instantiation"); 3777 LookupQualifiedName(Previous, CurContext); 3778 } 3779 3780 NestedNameSpecifier *NNS = 3781 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3782 3783 // Check for invalid redeclarations. 3784 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3785 return 0; 3786 3787 // Check for bad qualifiers. 3788 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3789 return 0; 3790 3791 DeclContext *LookupContext = computeDeclContext(SS); 3792 NamedDecl *D; 3793 if (!LookupContext) { 3794 if (IsTypeName) { 3795 // FIXME: not all declaration name kinds are legal here 3796 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3797 UsingLoc, TypenameLoc, 3798 SS.getRange(), NNS, 3799 IdentLoc, Name); 3800 } else { 3801 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3802 UsingLoc, SS.getRange(), NNS, 3803 IdentLoc, Name); 3804 } 3805 } else { 3806 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3807 SS.getRange(), UsingLoc, NNS, Name, 3808 IsTypeName); 3809 } 3810 D->setAccess(AS); 3811 CurContext->addDecl(D); 3812 3813 if (!LookupContext) return D; 3814 UsingDecl *UD = cast<UsingDecl>(D); 3815 3816 if (RequireCompleteDeclContext(SS, LookupContext)) { 3817 UD->setInvalidDecl(); 3818 return UD; 3819 } 3820 3821 // Look up the target name. 3822 3823 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3824 3825 // Unlike most lookups, we don't always want to hide tag 3826 // declarations: tag names are visible through the using declaration 3827 // even if hidden by ordinary names, *except* in a dependent context 3828 // where it's important for the sanity of two-phase lookup. 3829 if (!IsInstantiation) 3830 R.setHideTags(false); 3831 3832 LookupQualifiedName(R, LookupContext); 3833 3834 if (R.empty()) { 3835 Diag(IdentLoc, diag::err_no_member) 3836 << Name << LookupContext << SS.getRange(); 3837 UD->setInvalidDecl(); 3838 return UD; 3839 } 3840 3841 if (R.isAmbiguous()) { 3842 UD->setInvalidDecl(); 3843 return UD; 3844 } 3845 3846 if (IsTypeName) { 3847 // If we asked for a typename and got a non-type decl, error out. 3848 if (!R.getAsSingle<TypeDecl>()) { 3849 Diag(IdentLoc, diag::err_using_typename_non_type); 3850 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3851 Diag((*I)->getUnderlyingDecl()->getLocation(), 3852 diag::note_using_decl_target); 3853 UD->setInvalidDecl(); 3854 return UD; 3855 } 3856 } else { 3857 // If we asked for a non-typename and we got a type, error out, 3858 // but only if this is an instantiation of an unresolved using 3859 // decl. Otherwise just silently find the type name. 3860 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3861 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3862 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3863 UD->setInvalidDecl(); 3864 return UD; 3865 } 3866 } 3867 3868 // C++0x N2914 [namespace.udecl]p6: 3869 // A using-declaration shall not name a namespace. 3870 if (R.getAsSingle<NamespaceDecl>()) { 3871 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3872 << SS.getRange(); 3873 UD->setInvalidDecl(); 3874 return UD; 3875 } 3876 3877 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3878 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3879 BuildUsingShadowDecl(S, UD, *I); 3880 } 3881 3882 return UD; 3883} 3884 3885/// Checks that the given using declaration is not an invalid 3886/// redeclaration. Note that this is checking only for the using decl 3887/// itself, not for any ill-formedness among the UsingShadowDecls. 3888bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3889 bool isTypeName, 3890 const CXXScopeSpec &SS, 3891 SourceLocation NameLoc, 3892 const LookupResult &Prev) { 3893 // C++03 [namespace.udecl]p8: 3894 // C++0x [namespace.udecl]p10: 3895 // A using-declaration is a declaration and can therefore be used 3896 // repeatedly where (and only where) multiple declarations are 3897 // allowed. 3898 // 3899 // That's in non-member contexts. 3900 if (!CurContext->getLookupContext()->isRecord()) 3901 return false; 3902 3903 NestedNameSpecifier *Qual 3904 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3905 3906 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3907 NamedDecl *D = *I; 3908 3909 bool DTypename; 3910 NestedNameSpecifier *DQual; 3911 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3912 DTypename = UD->isTypeName(); 3913 DQual = UD->getTargetNestedNameDecl(); 3914 } else if (UnresolvedUsingValueDecl *UD 3915 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3916 DTypename = false; 3917 DQual = UD->getTargetNestedNameSpecifier(); 3918 } else if (UnresolvedUsingTypenameDecl *UD 3919 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3920 DTypename = true; 3921 DQual = UD->getTargetNestedNameSpecifier(); 3922 } else continue; 3923 3924 // using decls differ if one says 'typename' and the other doesn't. 3925 // FIXME: non-dependent using decls? 3926 if (isTypeName != DTypename) continue; 3927 3928 // using decls differ if they name different scopes (but note that 3929 // template instantiation can cause this check to trigger when it 3930 // didn't before instantiation). 3931 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3932 Context.getCanonicalNestedNameSpecifier(DQual)) 3933 continue; 3934 3935 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3936 Diag(D->getLocation(), diag::note_using_decl) << 1; 3937 return true; 3938 } 3939 3940 return false; 3941} 3942 3943 3944/// Checks that the given nested-name qualifier used in a using decl 3945/// in the current context is appropriately related to the current 3946/// scope. If an error is found, diagnoses it and returns true. 3947bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3948 const CXXScopeSpec &SS, 3949 SourceLocation NameLoc) { 3950 DeclContext *NamedContext = computeDeclContext(SS); 3951 3952 if (!CurContext->isRecord()) { 3953 // C++03 [namespace.udecl]p3: 3954 // C++0x [namespace.udecl]p8: 3955 // A using-declaration for a class member shall be a member-declaration. 3956 3957 // If we weren't able to compute a valid scope, it must be a 3958 // dependent class scope. 3959 if (!NamedContext || NamedContext->isRecord()) { 3960 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3961 << SS.getRange(); 3962 return true; 3963 } 3964 3965 // Otherwise, everything is known to be fine. 3966 return false; 3967 } 3968 3969 // The current scope is a record. 3970 3971 // If the named context is dependent, we can't decide much. 3972 if (!NamedContext) { 3973 // FIXME: in C++0x, we can diagnose if we can prove that the 3974 // nested-name-specifier does not refer to a base class, which is 3975 // still possible in some cases. 3976 3977 // Otherwise we have to conservatively report that things might be 3978 // okay. 3979 return false; 3980 } 3981 3982 if (!NamedContext->isRecord()) { 3983 // Ideally this would point at the last name in the specifier, 3984 // but we don't have that level of source info. 3985 Diag(SS.getRange().getBegin(), 3986 diag::err_using_decl_nested_name_specifier_is_not_class) 3987 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3988 return true; 3989 } 3990 3991 if (getLangOptions().CPlusPlus0x) { 3992 // C++0x [namespace.udecl]p3: 3993 // In a using-declaration used as a member-declaration, the 3994 // nested-name-specifier shall name a base class of the class 3995 // being defined. 3996 3997 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3998 cast<CXXRecordDecl>(NamedContext))) { 3999 if (CurContext == NamedContext) { 4000 Diag(NameLoc, 4001 diag::err_using_decl_nested_name_specifier_is_current_class) 4002 << SS.getRange(); 4003 return true; 4004 } 4005 4006 Diag(SS.getRange().getBegin(), 4007 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4008 << (NestedNameSpecifier*) SS.getScopeRep() 4009 << cast<CXXRecordDecl>(CurContext) 4010 << SS.getRange(); 4011 return true; 4012 } 4013 4014 return false; 4015 } 4016 4017 // C++03 [namespace.udecl]p4: 4018 // A using-declaration used as a member-declaration shall refer 4019 // to a member of a base class of the class being defined [etc.]. 4020 4021 // Salient point: SS doesn't have to name a base class as long as 4022 // lookup only finds members from base classes. Therefore we can 4023 // diagnose here only if we can prove that that can't happen, 4024 // i.e. if the class hierarchies provably don't intersect. 4025 4026 // TODO: it would be nice if "definitely valid" results were cached 4027 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4028 // need to be repeated. 4029 4030 struct UserData { 4031 llvm::DenseSet<const CXXRecordDecl*> Bases; 4032 4033 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4034 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4035 Data->Bases.insert(Base); 4036 return true; 4037 } 4038 4039 bool hasDependentBases(const CXXRecordDecl *Class) { 4040 return !Class->forallBases(collect, this); 4041 } 4042 4043 /// Returns true if the base is dependent or is one of the 4044 /// accumulated base classes. 4045 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4046 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4047 return !Data->Bases.count(Base); 4048 } 4049 4050 bool mightShareBases(const CXXRecordDecl *Class) { 4051 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4052 } 4053 }; 4054 4055 UserData Data; 4056 4057 // Returns false if we find a dependent base. 4058 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4059 return false; 4060 4061 // Returns false if the class has a dependent base or if it or one 4062 // of its bases is present in the base set of the current context. 4063 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4064 return false; 4065 4066 Diag(SS.getRange().getBegin(), 4067 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4068 << (NestedNameSpecifier*) SS.getScopeRep() 4069 << cast<CXXRecordDecl>(CurContext) 4070 << SS.getRange(); 4071 4072 return true; 4073} 4074 4075Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 4076 SourceLocation NamespaceLoc, 4077 SourceLocation AliasLoc, 4078 IdentifierInfo *Alias, 4079 CXXScopeSpec &SS, 4080 SourceLocation IdentLoc, 4081 IdentifierInfo *Ident) { 4082 4083 // Lookup the namespace name. 4084 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4085 LookupParsedName(R, S, &SS); 4086 4087 // Check if we have a previous declaration with the same name. 4088 NamedDecl *PrevDecl 4089 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4090 ForRedeclaration); 4091 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4092 PrevDecl = 0; 4093 4094 if (PrevDecl) { 4095 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4096 // We already have an alias with the same name that points to the same 4097 // namespace, so don't create a new one. 4098 // FIXME: At some point, we'll want to create the (redundant) 4099 // declaration to maintain better source information. 4100 if (!R.isAmbiguous() && !R.empty() && 4101 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4102 return DeclPtrTy(); 4103 } 4104 4105 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4106 diag::err_redefinition_different_kind; 4107 Diag(AliasLoc, DiagID) << Alias; 4108 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4109 return DeclPtrTy(); 4110 } 4111 4112 if (R.isAmbiguous()) 4113 return DeclPtrTy(); 4114 4115 if (R.empty()) { 4116 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4117 return DeclPtrTy(); 4118 } 4119 4120 NamespaceAliasDecl *AliasDecl = 4121 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4122 Alias, SS.getRange(), 4123 (NestedNameSpecifier *)SS.getScopeRep(), 4124 IdentLoc, R.getFoundDecl()); 4125 4126 PushOnScopeChains(AliasDecl, S); 4127 return DeclPtrTy::make(AliasDecl); 4128} 4129 4130namespace { 4131 /// \brief Scoped object used to handle the state changes required in Sema 4132 /// to implicitly define the body of a C++ member function; 4133 class ImplicitlyDefinedFunctionScope { 4134 Sema &S; 4135 DeclContext *PreviousContext; 4136 4137 public: 4138 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4139 : S(S), PreviousContext(S.CurContext) 4140 { 4141 S.CurContext = Method; 4142 S.PushFunctionScope(); 4143 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4144 } 4145 4146 ~ImplicitlyDefinedFunctionScope() { 4147 S.PopExpressionEvaluationContext(); 4148 S.PopFunctionOrBlockScope(); 4149 S.CurContext = PreviousContext; 4150 } 4151 }; 4152} 4153 4154void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4155 CXXConstructorDecl *Constructor) { 4156 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4157 !Constructor->isUsed()) && 4158 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4159 4160 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4161 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4162 4163 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4164 ErrorTrap Trap(*this); 4165 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4166 Trap.hasErrorOccurred()) { 4167 Diag(CurrentLocation, diag::note_member_synthesized_at) 4168 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4169 Constructor->setInvalidDecl(); 4170 } else { 4171 Constructor->setUsed(); 4172 MarkVTableUsed(CurrentLocation, ClassDecl); 4173 } 4174} 4175 4176void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4177 CXXDestructorDecl *Destructor) { 4178 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 4179 "DefineImplicitDestructor - call it for implicit default dtor"); 4180 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4181 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4182 4183 if (Destructor->isInvalidDecl()) 4184 return; 4185 4186 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4187 4188 ErrorTrap Trap(*this); 4189 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4190 Destructor->getParent()); 4191 4192 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4193 Diag(CurrentLocation, diag::note_member_synthesized_at) 4194 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4195 4196 Destructor->setInvalidDecl(); 4197 return; 4198 } 4199 4200 Destructor->setUsed(); 4201 MarkVTableUsed(CurrentLocation, ClassDecl); 4202} 4203 4204/// \brief Builds a statement that copies the given entity from \p From to 4205/// \c To. 4206/// 4207/// This routine is used to copy the members of a class with an 4208/// implicitly-declared copy assignment operator. When the entities being 4209/// copied are arrays, this routine builds for loops to copy them. 4210/// 4211/// \param S The Sema object used for type-checking. 4212/// 4213/// \param Loc The location where the implicit copy is being generated. 4214/// 4215/// \param T The type of the expressions being copied. Both expressions must 4216/// have this type. 4217/// 4218/// \param To The expression we are copying to. 4219/// 4220/// \param From The expression we are copying from. 4221/// 4222/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4223/// Otherwise, it's a non-static member subobject. 4224/// 4225/// \param Depth Internal parameter recording the depth of the recursion. 4226/// 4227/// \returns A statement or a loop that copies the expressions. 4228static Sema::OwningStmtResult 4229BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4230 Sema::OwningExprResult To, Sema::OwningExprResult From, 4231 bool CopyingBaseSubobject, unsigned Depth = 0) { 4232 typedef Sema::OwningStmtResult OwningStmtResult; 4233 typedef Sema::OwningExprResult OwningExprResult; 4234 4235 // C++0x [class.copy]p30: 4236 // Each subobject is assigned in the manner appropriate to its type: 4237 // 4238 // - if the subobject is of class type, the copy assignment operator 4239 // for the class is used (as if by explicit qualification; that is, 4240 // ignoring any possible virtual overriding functions in more derived 4241 // classes); 4242 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4243 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4244 4245 // Look for operator=. 4246 DeclarationName Name 4247 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4248 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4249 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4250 4251 // Filter out any result that isn't a copy-assignment operator. 4252 LookupResult::Filter F = OpLookup.makeFilter(); 4253 while (F.hasNext()) { 4254 NamedDecl *D = F.next(); 4255 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4256 if (Method->isCopyAssignmentOperator()) 4257 continue; 4258 4259 F.erase(); 4260 } 4261 F.done(); 4262 4263 // Suppress the protected check (C++ [class.protected]) for each of the 4264 // assignment operators we found. This strange dance is required when 4265 // we're assigning via a base classes's copy-assignment operator. To 4266 // ensure that we're getting the right base class subobject (without 4267 // ambiguities), we need to cast "this" to that subobject type; to 4268 // ensure that we don't go through the virtual call mechanism, we need 4269 // to qualify the operator= name with the base class (see below). However, 4270 // this means that if the base class has a protected copy assignment 4271 // operator, the protected member access check will fail. So, we 4272 // rewrite "protected" access to "public" access in this case, since we 4273 // know by construction that we're calling from a derived class. 4274 if (CopyingBaseSubobject) { 4275 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4276 L != LEnd; ++L) { 4277 if (L.getAccess() == AS_protected) 4278 L.setAccess(AS_public); 4279 } 4280 } 4281 4282 // Create the nested-name-specifier that will be used to qualify the 4283 // reference to operator=; this is required to suppress the virtual 4284 // call mechanism. 4285 CXXScopeSpec SS; 4286 SS.setRange(Loc); 4287 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4288 T.getTypePtr())); 4289 4290 // Create the reference to operator=. 4291 OwningExprResult OpEqualRef 4292 = S.BuildMemberReferenceExpr(move(To), T, Loc, /*isArrow=*/false, SS, 4293 /*FirstQualifierInScope=*/0, OpLookup, 4294 /*TemplateArgs=*/0, 4295 /*SuppressQualifierCheck=*/true); 4296 if (OpEqualRef.isInvalid()) 4297 return S.StmtError(); 4298 4299 // Build the call to the assignment operator. 4300 Expr *FromE = From.takeAs<Expr>(); 4301 OwningExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4302 OpEqualRef.takeAs<Expr>(), 4303 Loc, &FromE, 1, 0, Loc); 4304 if (Call.isInvalid()) 4305 return S.StmtError(); 4306 4307 return S.Owned(Call.takeAs<Stmt>()); 4308 } 4309 4310 // - if the subobject is of scalar type, the built-in assignment 4311 // operator is used. 4312 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4313 if (!ArrayTy) { 4314 OwningExprResult Assignment = S.CreateBuiltinBinOp(Loc, 4315 BinaryOperator::Assign, 4316 To.takeAs<Expr>(), 4317 From.takeAs<Expr>()); 4318 if (Assignment.isInvalid()) 4319 return S.StmtError(); 4320 4321 return S.Owned(Assignment.takeAs<Stmt>()); 4322 } 4323 4324 // - if the subobject is an array, each element is assigned, in the 4325 // manner appropriate to the element type; 4326 4327 // Construct a loop over the array bounds, e.g., 4328 // 4329 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4330 // 4331 // that will copy each of the array elements. 4332 QualType SizeType = S.Context.getSizeType(); 4333 4334 // Create the iteration variable. 4335 IdentifierInfo *IterationVarName = 0; 4336 { 4337 llvm::SmallString<8> Str; 4338 llvm::raw_svector_ostream OS(Str); 4339 OS << "__i" << Depth; 4340 IterationVarName = &S.Context.Idents.get(OS.str()); 4341 } 4342 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4343 IterationVarName, SizeType, 4344 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4345 VarDecl::None, VarDecl::None); 4346 4347 // Initialize the iteration variable to zero. 4348 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4349 IterationVar->setInit(new (S.Context) IntegerLiteral(Zero, SizeType, Loc)); 4350 4351 // Create a reference to the iteration variable; we'll use this several 4352 // times throughout. 4353 Expr *IterationVarRef 4354 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4355 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4356 4357 // Create the DeclStmt that holds the iteration variable. 4358 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4359 4360 // Create the comparison against the array bound. 4361 llvm::APInt Upper = ArrayTy->getSize(); 4362 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4363 OwningExprResult Comparison 4364 = S.Owned(new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4365 new (S.Context) IntegerLiteral(Upper, SizeType, Loc), 4366 BinaryOperator::NE, S.Context.BoolTy, Loc)); 4367 4368 // Create the pre-increment of the iteration variable. 4369 OwningExprResult Increment 4370 = S.Owned(new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4371 UnaryOperator::PreInc, 4372 SizeType, Loc)); 4373 4374 // Subscript the "from" and "to" expressions with the iteration variable. 4375 From = S.CreateBuiltinArraySubscriptExpr(move(From), Loc, 4376 S.Owned(IterationVarRef->Retain()), 4377 Loc); 4378 To = S.CreateBuiltinArraySubscriptExpr(move(To), Loc, 4379 S.Owned(IterationVarRef->Retain()), 4380 Loc); 4381 assert(!From.isInvalid() && "Builtin subscripting can't fail!"); 4382 assert(!To.isInvalid() && "Builtin subscripting can't fail!"); 4383 4384 // Build the copy for an individual element of the array. 4385 OwningStmtResult Copy = BuildSingleCopyAssign(S, Loc, 4386 ArrayTy->getElementType(), 4387 move(To), move(From), 4388 CopyingBaseSubobject, Depth+1); 4389 if (Copy.isInvalid()) { 4390 InitStmt->Destroy(S.Context); 4391 return S.StmtError(); 4392 } 4393 4394 // Construct the loop that copies all elements of this array. 4395 return S.ActOnForStmt(Loc, Loc, S.Owned(InitStmt), 4396 S.MakeFullExpr(Comparison), 4397 Sema::DeclPtrTy(), 4398 S.MakeFullExpr(Increment), 4399 Loc, move(Copy)); 4400} 4401 4402void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4403 CXXMethodDecl *CopyAssignOperator) { 4404 assert((CopyAssignOperator->isImplicit() && 4405 CopyAssignOperator->isOverloadedOperator() && 4406 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4407 !CopyAssignOperator->isUsed()) && 4408 "DefineImplicitCopyAssignment called for wrong function"); 4409 4410 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4411 4412 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4413 CopyAssignOperator->setInvalidDecl(); 4414 return; 4415 } 4416 4417 CopyAssignOperator->setUsed(); 4418 4419 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4420 ErrorTrap Trap(*this); 4421 4422 // C++0x [class.copy]p30: 4423 // The implicitly-defined or explicitly-defaulted copy assignment operator 4424 // for a non-union class X performs memberwise copy assignment of its 4425 // subobjects. The direct base classes of X are assigned first, in the 4426 // order of their declaration in the base-specifier-list, and then the 4427 // immediate non-static data members of X are assigned, in the order in 4428 // which they were declared in the class definition. 4429 4430 // The statements that form the synthesized function body. 4431 ASTOwningVector<&ActionBase::DeleteStmt> Statements(*this); 4432 4433 // The parameter for the "other" object, which we are copying from. 4434 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4435 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4436 QualType OtherRefType = Other->getType(); 4437 if (const LValueReferenceType *OtherRef 4438 = OtherRefType->getAs<LValueReferenceType>()) { 4439 OtherRefType = OtherRef->getPointeeType(); 4440 OtherQuals = OtherRefType.getQualifiers(); 4441 } 4442 4443 // Our location for everything implicitly-generated. 4444 SourceLocation Loc = CopyAssignOperator->getLocation(); 4445 4446 // Construct a reference to the "other" object. We'll be using this 4447 // throughout the generated ASTs. 4448 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4449 assert(OtherRef && "Reference to parameter cannot fail!"); 4450 4451 // Construct the "this" pointer. We'll be using this throughout the generated 4452 // ASTs. 4453 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4454 assert(This && "Reference to this cannot fail!"); 4455 4456 // Assign base classes. 4457 bool Invalid = false; 4458 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4459 E = ClassDecl->bases_end(); Base != E; ++Base) { 4460 // Form the assignment: 4461 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4462 QualType BaseType = Base->getType().getUnqualifiedType(); 4463 CXXRecordDecl *BaseClassDecl = 0; 4464 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4465 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4466 else { 4467 Invalid = true; 4468 continue; 4469 } 4470 4471 // Construct the "from" expression, which is an implicit cast to the 4472 // appropriately-qualified base type. 4473 Expr *From = OtherRef->Retain(); 4474 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4475 CastExpr::CK_UncheckedDerivedToBase, /*isLvalue=*/true, 4476 CXXBaseSpecifierArray(Base)); 4477 4478 // Dereference "this". 4479 OwningExprResult To = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4480 Owned(This->Retain())); 4481 4482 // Implicitly cast "this" to the appropriately-qualified base type. 4483 Expr *ToE = To.takeAs<Expr>(); 4484 ImpCastExprToType(ToE, 4485 Context.getCVRQualifiedType(BaseType, 4486 CopyAssignOperator->getTypeQualifiers()), 4487 CastExpr::CK_UncheckedDerivedToBase, 4488 /*isLvalue=*/true, CXXBaseSpecifierArray(Base)); 4489 To = Owned(ToE); 4490 4491 // Build the copy. 4492 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4493 move(To), Owned(From), 4494 /*CopyingBaseSubobject=*/true); 4495 if (Copy.isInvalid()) { 4496 Diag(CurrentLocation, diag::note_member_synthesized_at) 4497 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4498 CopyAssignOperator->setInvalidDecl(); 4499 return; 4500 } 4501 4502 // Success! Record the copy. 4503 Statements.push_back(Copy.takeAs<Expr>()); 4504 } 4505 4506 // \brief Reference to the __builtin_memcpy function. 4507 Expr *BuiltinMemCpyRef = 0; 4508 4509 // Assign non-static members. 4510 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4511 FieldEnd = ClassDecl->field_end(); 4512 Field != FieldEnd; ++Field) { 4513 // Check for members of reference type; we can't copy those. 4514 if (Field->getType()->isReferenceType()) { 4515 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4516 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4517 Diag(Field->getLocation(), diag::note_declared_at); 4518 Diag(CurrentLocation, diag::note_member_synthesized_at) 4519 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4520 Invalid = true; 4521 continue; 4522 } 4523 4524 // Check for members of const-qualified, non-class type. 4525 QualType BaseType = Context.getBaseElementType(Field->getType()); 4526 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4527 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4528 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4529 Diag(Field->getLocation(), diag::note_declared_at); 4530 Diag(CurrentLocation, diag::note_member_synthesized_at) 4531 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4532 Invalid = true; 4533 continue; 4534 } 4535 4536 QualType FieldType = Field->getType().getNonReferenceType(); 4537 4538 // Build references to the field in the object we're copying from and to. 4539 CXXScopeSpec SS; // Intentionally empty 4540 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 4541 LookupMemberName); 4542 MemberLookup.addDecl(*Field); 4543 MemberLookup.resolveKind(); 4544 OwningExprResult From = BuildMemberReferenceExpr(Owned(OtherRef->Retain()), 4545 OtherRefType, 4546 Loc, /*IsArrow=*/false, 4547 SS, 0, MemberLookup, 0); 4548 OwningExprResult To = BuildMemberReferenceExpr(Owned(This->Retain()), 4549 This->getType(), 4550 Loc, /*IsArrow=*/true, 4551 SS, 0, MemberLookup, 0); 4552 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 4553 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 4554 4555 // If the field should be copied with __builtin_memcpy rather than via 4556 // explicit assignments, do so. This optimization only applies for arrays 4557 // of scalars and arrays of class type with trivial copy-assignment 4558 // operators. 4559 if (FieldType->isArrayType() && 4560 (!BaseType->isRecordType() || 4561 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 4562 ->hasTrivialCopyAssignment())) { 4563 // Compute the size of the memory buffer to be copied. 4564 QualType SizeType = Context.getSizeType(); 4565 llvm::APInt Size(Context.getTypeSize(SizeType), 4566 Context.getTypeSizeInChars(BaseType).getQuantity()); 4567 for (const ConstantArrayType *Array 4568 = Context.getAsConstantArrayType(FieldType); 4569 Array; 4570 Array = Context.getAsConstantArrayType(Array->getElementType())) { 4571 llvm::APInt ArraySize = Array->getSize(); 4572 ArraySize.zextOrTrunc(Size.getBitWidth()); 4573 Size *= ArraySize; 4574 } 4575 4576 // Take the address of the field references for "from" and "to". 4577 From = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(From)); 4578 To = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(To)); 4579 4580 // Create a reference to the __builtin_memcpy builtin function. 4581 if (!BuiltinMemCpyRef) { 4582 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 4583 LookupOrdinaryName); 4584 LookupName(R, TUScope, true); 4585 4586 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 4587 if (!BuiltinMemCpy) { 4588 // Something went horribly wrong earlier, and we will have complained 4589 // about it. 4590 Invalid = true; 4591 continue; 4592 } 4593 4594 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 4595 BuiltinMemCpy->getType(), 4596 Loc, 0).takeAs<Expr>(); 4597 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 4598 } 4599 4600 ASTOwningVector<&ActionBase::DeleteExpr> CallArgs(*this); 4601 CallArgs.push_back(To.takeAs<Expr>()); 4602 CallArgs.push_back(From.takeAs<Expr>()); 4603 CallArgs.push_back(new (Context) IntegerLiteral(Size, SizeType, Loc)); 4604 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 4605 Commas.push_back(Loc); 4606 Commas.push_back(Loc); 4607 OwningExprResult Call = ActOnCallExpr(/*Scope=*/0, 4608 Owned(BuiltinMemCpyRef->Retain()), 4609 Loc, move_arg(CallArgs), 4610 Commas.data(), Loc); 4611 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 4612 Statements.push_back(Call.takeAs<Expr>()); 4613 continue; 4614 } 4615 4616 // Build the copy of this field. 4617 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 4618 move(To), move(From), 4619 /*CopyingBaseSubobject=*/false); 4620 if (Copy.isInvalid()) { 4621 Diag(CurrentLocation, diag::note_member_synthesized_at) 4622 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4623 CopyAssignOperator->setInvalidDecl(); 4624 return; 4625 } 4626 4627 // Success! Record the copy. 4628 Statements.push_back(Copy.takeAs<Stmt>()); 4629 } 4630 4631 if (!Invalid) { 4632 // Add a "return *this;" 4633 OwningExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4634 Owned(This->Retain())); 4635 4636 OwningStmtResult Return = ActOnReturnStmt(Loc, move(ThisObj)); 4637 if (Return.isInvalid()) 4638 Invalid = true; 4639 else { 4640 Statements.push_back(Return.takeAs<Stmt>()); 4641 4642 if (Trap.hasErrorOccurred()) { 4643 Diag(CurrentLocation, diag::note_member_synthesized_at) 4644 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4645 Invalid = true; 4646 } 4647 } 4648 } 4649 4650 if (Invalid) { 4651 CopyAssignOperator->setInvalidDecl(); 4652 return; 4653 } 4654 4655 OwningStmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 4656 /*isStmtExpr=*/false); 4657 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 4658 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 4659} 4660 4661void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 4662 CXXConstructorDecl *CopyConstructor, 4663 unsigned TypeQuals) { 4664 assert((CopyConstructor->isImplicit() && 4665 CopyConstructor->isCopyConstructor(TypeQuals) && 4666 !CopyConstructor->isUsed()) && 4667 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 4668 4669 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 4670 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 4671 4672 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 4673 ErrorTrap Trap(*this); 4674 4675 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 4676 Trap.hasErrorOccurred()) { 4677 Diag(CurrentLocation, diag::note_member_synthesized_at) 4678 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 4679 CopyConstructor->setInvalidDecl(); 4680 } else { 4681 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 4682 CopyConstructor->getLocation(), 4683 MultiStmtArg(*this, 0, 0), 4684 /*isStmtExpr=*/false) 4685 .takeAs<Stmt>()); 4686 } 4687 4688 CopyConstructor->setUsed(); 4689} 4690 4691Sema::OwningExprResult 4692Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4693 CXXConstructorDecl *Constructor, 4694 MultiExprArg ExprArgs, 4695 bool RequiresZeroInit, 4696 CXXConstructExpr::ConstructionKind ConstructKind) { 4697 bool Elidable = false; 4698 4699 // C++0x [class.copy]p34: 4700 // When certain criteria are met, an implementation is allowed to 4701 // omit the copy/move construction of a class object, even if the 4702 // copy/move constructor and/or destructor for the object have 4703 // side effects. [...] 4704 // - when a temporary class object that has not been bound to a 4705 // reference (12.2) would be copied/moved to a class object 4706 // with the same cv-unqualified type, the copy/move operation 4707 // can be omitted by constructing the temporary object 4708 // directly into the target of the omitted copy/move 4709 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 4710 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 4711 Elidable = SubExpr->isTemporaryObject() && 4712 Context.hasSameUnqualifiedType(SubExpr->getType(), 4713 Context.getTypeDeclType(Constructor->getParent())); 4714 } 4715 4716 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4717 Elidable, move(ExprArgs), RequiresZeroInit, 4718 ConstructKind); 4719} 4720 4721/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4722/// including handling of its default argument expressions. 4723Sema::OwningExprResult 4724Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4725 CXXConstructorDecl *Constructor, bool Elidable, 4726 MultiExprArg ExprArgs, 4727 bool RequiresZeroInit, 4728 CXXConstructExpr::ConstructionKind ConstructKind) { 4729 unsigned NumExprs = ExprArgs.size(); 4730 Expr **Exprs = (Expr **)ExprArgs.release(); 4731 4732 MarkDeclarationReferenced(ConstructLoc, Constructor); 4733 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4734 Constructor, Elidable, Exprs, NumExprs, 4735 RequiresZeroInit, ConstructKind)); 4736} 4737 4738bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4739 CXXConstructorDecl *Constructor, 4740 MultiExprArg Exprs) { 4741 OwningExprResult TempResult = 4742 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4743 move(Exprs)); 4744 if (TempResult.isInvalid()) 4745 return true; 4746 4747 Expr *Temp = TempResult.takeAs<Expr>(); 4748 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4749 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4750 VD->setInit(Temp); 4751 4752 return false; 4753} 4754 4755void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4756 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4757 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4758 !ClassDecl->hasTrivialDestructor()) { 4759 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4760 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4761 CheckDestructorAccess(VD->getLocation(), Destructor, 4762 PDiag(diag::err_access_dtor_var) 4763 << VD->getDeclName() 4764 << VD->getType()); 4765 } 4766} 4767 4768/// AddCXXDirectInitializerToDecl - This action is called immediately after 4769/// ActOnDeclarator, when a C++ direct initializer is present. 4770/// e.g: "int x(1);" 4771void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4772 SourceLocation LParenLoc, 4773 MultiExprArg Exprs, 4774 SourceLocation *CommaLocs, 4775 SourceLocation RParenLoc) { 4776 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4777 Decl *RealDecl = Dcl.getAs<Decl>(); 4778 4779 // If there is no declaration, there was an error parsing it. Just ignore 4780 // the initializer. 4781 if (RealDecl == 0) 4782 return; 4783 4784 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4785 if (!VDecl) { 4786 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4787 RealDecl->setInvalidDecl(); 4788 return; 4789 } 4790 4791 // We will represent direct-initialization similarly to copy-initialization: 4792 // int x(1); -as-> int x = 1; 4793 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4794 // 4795 // Clients that want to distinguish between the two forms, can check for 4796 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4797 // A major benefit is that clients that don't particularly care about which 4798 // exactly form was it (like the CodeGen) can handle both cases without 4799 // special case code. 4800 4801 // C++ 8.5p11: 4802 // The form of initialization (using parentheses or '=') is generally 4803 // insignificant, but does matter when the entity being initialized has a 4804 // class type. 4805 QualType DeclInitType = VDecl->getType(); 4806 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4807 DeclInitType = Context.getBaseElementType(Array); 4808 4809 if (!VDecl->getType()->isDependentType() && 4810 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4811 diag::err_typecheck_decl_incomplete_type)) { 4812 VDecl->setInvalidDecl(); 4813 return; 4814 } 4815 4816 // The variable can not have an abstract class type. 4817 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4818 diag::err_abstract_type_in_decl, 4819 AbstractVariableType)) 4820 VDecl->setInvalidDecl(); 4821 4822 const VarDecl *Def; 4823 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4824 Diag(VDecl->getLocation(), diag::err_redefinition) 4825 << VDecl->getDeclName(); 4826 Diag(Def->getLocation(), diag::note_previous_definition); 4827 VDecl->setInvalidDecl(); 4828 return; 4829 } 4830 4831 // If either the declaration has a dependent type or if any of the 4832 // expressions is type-dependent, we represent the initialization 4833 // via a ParenListExpr for later use during template instantiation. 4834 if (VDecl->getType()->isDependentType() || 4835 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4836 // Let clients know that initialization was done with a direct initializer. 4837 VDecl->setCXXDirectInitializer(true); 4838 4839 // Store the initialization expressions as a ParenListExpr. 4840 unsigned NumExprs = Exprs.size(); 4841 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4842 (Expr **)Exprs.release(), 4843 NumExprs, RParenLoc)); 4844 return; 4845 } 4846 4847 // Capture the variable that is being initialized and the style of 4848 // initialization. 4849 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4850 4851 // FIXME: Poor source location information. 4852 InitializationKind Kind 4853 = InitializationKind::CreateDirect(VDecl->getLocation(), 4854 LParenLoc, RParenLoc); 4855 4856 InitializationSequence InitSeq(*this, Entity, Kind, 4857 (Expr**)Exprs.get(), Exprs.size()); 4858 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4859 if (Result.isInvalid()) { 4860 VDecl->setInvalidDecl(); 4861 return; 4862 } 4863 4864 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4865 VDecl->setInit(Result.takeAs<Expr>()); 4866 VDecl->setCXXDirectInitializer(true); 4867 4868 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4869 FinalizeVarWithDestructor(VDecl, Record); 4870} 4871 4872/// \brief Given a constructor and the set of arguments provided for the 4873/// constructor, convert the arguments and add any required default arguments 4874/// to form a proper call to this constructor. 4875/// 4876/// \returns true if an error occurred, false otherwise. 4877bool 4878Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4879 MultiExprArg ArgsPtr, 4880 SourceLocation Loc, 4881 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4882 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4883 unsigned NumArgs = ArgsPtr.size(); 4884 Expr **Args = (Expr **)ArgsPtr.get(); 4885 4886 const FunctionProtoType *Proto 4887 = Constructor->getType()->getAs<FunctionProtoType>(); 4888 assert(Proto && "Constructor without a prototype?"); 4889 unsigned NumArgsInProto = Proto->getNumArgs(); 4890 4891 // If too few arguments are available, we'll fill in the rest with defaults. 4892 if (NumArgs < NumArgsInProto) 4893 ConvertedArgs.reserve(NumArgsInProto); 4894 else 4895 ConvertedArgs.reserve(NumArgs); 4896 4897 VariadicCallType CallType = 4898 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4899 llvm::SmallVector<Expr *, 8> AllArgs; 4900 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4901 Proto, 0, Args, NumArgs, AllArgs, 4902 CallType); 4903 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4904 ConvertedArgs.push_back(AllArgs[i]); 4905 return Invalid; 4906} 4907 4908static inline bool 4909CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4910 const FunctionDecl *FnDecl) { 4911 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4912 if (isa<NamespaceDecl>(DC)) { 4913 return SemaRef.Diag(FnDecl->getLocation(), 4914 diag::err_operator_new_delete_declared_in_namespace) 4915 << FnDecl->getDeclName(); 4916 } 4917 4918 if (isa<TranslationUnitDecl>(DC) && 4919 FnDecl->getStorageClass() == FunctionDecl::Static) { 4920 return SemaRef.Diag(FnDecl->getLocation(), 4921 diag::err_operator_new_delete_declared_static) 4922 << FnDecl->getDeclName(); 4923 } 4924 4925 return false; 4926} 4927 4928static inline bool 4929CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4930 CanQualType ExpectedResultType, 4931 CanQualType ExpectedFirstParamType, 4932 unsigned DependentParamTypeDiag, 4933 unsigned InvalidParamTypeDiag) { 4934 QualType ResultType = 4935 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4936 4937 // Check that the result type is not dependent. 4938 if (ResultType->isDependentType()) 4939 return SemaRef.Diag(FnDecl->getLocation(), 4940 diag::err_operator_new_delete_dependent_result_type) 4941 << FnDecl->getDeclName() << ExpectedResultType; 4942 4943 // Check that the result type is what we expect. 4944 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4945 return SemaRef.Diag(FnDecl->getLocation(), 4946 diag::err_operator_new_delete_invalid_result_type) 4947 << FnDecl->getDeclName() << ExpectedResultType; 4948 4949 // A function template must have at least 2 parameters. 4950 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4951 return SemaRef.Diag(FnDecl->getLocation(), 4952 diag::err_operator_new_delete_template_too_few_parameters) 4953 << FnDecl->getDeclName(); 4954 4955 // The function decl must have at least 1 parameter. 4956 if (FnDecl->getNumParams() == 0) 4957 return SemaRef.Diag(FnDecl->getLocation(), 4958 diag::err_operator_new_delete_too_few_parameters) 4959 << FnDecl->getDeclName(); 4960 4961 // Check the the first parameter type is not dependent. 4962 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4963 if (FirstParamType->isDependentType()) 4964 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4965 << FnDecl->getDeclName() << ExpectedFirstParamType; 4966 4967 // Check that the first parameter type is what we expect. 4968 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4969 ExpectedFirstParamType) 4970 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4971 << FnDecl->getDeclName() << ExpectedFirstParamType; 4972 4973 return false; 4974} 4975 4976static bool 4977CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4978 // C++ [basic.stc.dynamic.allocation]p1: 4979 // A program is ill-formed if an allocation function is declared in a 4980 // namespace scope other than global scope or declared static in global 4981 // scope. 4982 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4983 return true; 4984 4985 CanQualType SizeTy = 4986 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4987 4988 // C++ [basic.stc.dynamic.allocation]p1: 4989 // The return type shall be void*. The first parameter shall have type 4990 // std::size_t. 4991 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4992 SizeTy, 4993 diag::err_operator_new_dependent_param_type, 4994 diag::err_operator_new_param_type)) 4995 return true; 4996 4997 // C++ [basic.stc.dynamic.allocation]p1: 4998 // The first parameter shall not have an associated default argument. 4999 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5000 return SemaRef.Diag(FnDecl->getLocation(), 5001 diag::err_operator_new_default_arg) 5002 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5003 5004 return false; 5005} 5006 5007static bool 5008CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5009 // C++ [basic.stc.dynamic.deallocation]p1: 5010 // A program is ill-formed if deallocation functions are declared in a 5011 // namespace scope other than global scope or declared static in global 5012 // scope. 5013 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5014 return true; 5015 5016 // C++ [basic.stc.dynamic.deallocation]p2: 5017 // Each deallocation function shall return void and its first parameter 5018 // shall be void*. 5019 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5020 SemaRef.Context.VoidPtrTy, 5021 diag::err_operator_delete_dependent_param_type, 5022 diag::err_operator_delete_param_type)) 5023 return true; 5024 5025 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5026 if (FirstParamType->isDependentType()) 5027 return SemaRef.Diag(FnDecl->getLocation(), 5028 diag::err_operator_delete_dependent_param_type) 5029 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5030 5031 if (SemaRef.Context.getCanonicalType(FirstParamType) != 5032 SemaRef.Context.VoidPtrTy) 5033 return SemaRef.Diag(FnDecl->getLocation(), 5034 diag::err_operator_delete_param_type) 5035 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5036 5037 return false; 5038} 5039 5040/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5041/// of this overloaded operator is well-formed. If so, returns false; 5042/// otherwise, emits appropriate diagnostics and returns true. 5043bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5044 assert(FnDecl && FnDecl->isOverloadedOperator() && 5045 "Expected an overloaded operator declaration"); 5046 5047 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5048 5049 // C++ [over.oper]p5: 5050 // The allocation and deallocation functions, operator new, 5051 // operator new[], operator delete and operator delete[], are 5052 // described completely in 3.7.3. The attributes and restrictions 5053 // found in the rest of this subclause do not apply to them unless 5054 // explicitly stated in 3.7.3. 5055 if (Op == OO_Delete || Op == OO_Array_Delete) 5056 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5057 5058 if (Op == OO_New || Op == OO_Array_New) 5059 return CheckOperatorNewDeclaration(*this, FnDecl); 5060 5061 // C++ [over.oper]p6: 5062 // An operator function shall either be a non-static member 5063 // function or be a non-member function and have at least one 5064 // parameter whose type is a class, a reference to a class, an 5065 // enumeration, or a reference to an enumeration. 5066 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5067 if (MethodDecl->isStatic()) 5068 return Diag(FnDecl->getLocation(), 5069 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5070 } else { 5071 bool ClassOrEnumParam = false; 5072 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5073 ParamEnd = FnDecl->param_end(); 5074 Param != ParamEnd; ++Param) { 5075 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5076 if (ParamType->isDependentType() || ParamType->isRecordType() || 5077 ParamType->isEnumeralType()) { 5078 ClassOrEnumParam = true; 5079 break; 5080 } 5081 } 5082 5083 if (!ClassOrEnumParam) 5084 return Diag(FnDecl->getLocation(), 5085 diag::err_operator_overload_needs_class_or_enum) 5086 << FnDecl->getDeclName(); 5087 } 5088 5089 // C++ [over.oper]p8: 5090 // An operator function cannot have default arguments (8.3.6), 5091 // except where explicitly stated below. 5092 // 5093 // Only the function-call operator allows default arguments 5094 // (C++ [over.call]p1). 5095 if (Op != OO_Call) { 5096 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5097 Param != FnDecl->param_end(); ++Param) { 5098 if ((*Param)->hasDefaultArg()) 5099 return Diag((*Param)->getLocation(), 5100 diag::err_operator_overload_default_arg) 5101 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5102 } 5103 } 5104 5105 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5106 { false, false, false } 5107#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5108 , { Unary, Binary, MemberOnly } 5109#include "clang/Basic/OperatorKinds.def" 5110 }; 5111 5112 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5113 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5114 bool MustBeMemberOperator = OperatorUses[Op][2]; 5115 5116 // C++ [over.oper]p8: 5117 // [...] Operator functions cannot have more or fewer parameters 5118 // than the number required for the corresponding operator, as 5119 // described in the rest of this subclause. 5120 unsigned NumParams = FnDecl->getNumParams() 5121 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5122 if (Op != OO_Call && 5123 ((NumParams == 1 && !CanBeUnaryOperator) || 5124 (NumParams == 2 && !CanBeBinaryOperator) || 5125 (NumParams < 1) || (NumParams > 2))) { 5126 // We have the wrong number of parameters. 5127 unsigned ErrorKind; 5128 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5129 ErrorKind = 2; // 2 -> unary or binary. 5130 } else if (CanBeUnaryOperator) { 5131 ErrorKind = 0; // 0 -> unary 5132 } else { 5133 assert(CanBeBinaryOperator && 5134 "All non-call overloaded operators are unary or binary!"); 5135 ErrorKind = 1; // 1 -> binary 5136 } 5137 5138 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5139 << FnDecl->getDeclName() << NumParams << ErrorKind; 5140 } 5141 5142 // Overloaded operators other than operator() cannot be variadic. 5143 if (Op != OO_Call && 5144 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5145 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5146 << FnDecl->getDeclName(); 5147 } 5148 5149 // Some operators must be non-static member functions. 5150 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5151 return Diag(FnDecl->getLocation(), 5152 diag::err_operator_overload_must_be_member) 5153 << FnDecl->getDeclName(); 5154 } 5155 5156 // C++ [over.inc]p1: 5157 // The user-defined function called operator++ implements the 5158 // prefix and postfix ++ operator. If this function is a member 5159 // function with no parameters, or a non-member function with one 5160 // parameter of class or enumeration type, it defines the prefix 5161 // increment operator ++ for objects of that type. If the function 5162 // is a member function with one parameter (which shall be of type 5163 // int) or a non-member function with two parameters (the second 5164 // of which shall be of type int), it defines the postfix 5165 // increment operator ++ for objects of that type. 5166 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5167 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5168 bool ParamIsInt = false; 5169 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5170 ParamIsInt = BT->getKind() == BuiltinType::Int; 5171 5172 if (!ParamIsInt) 5173 return Diag(LastParam->getLocation(), 5174 diag::err_operator_overload_post_incdec_must_be_int) 5175 << LastParam->getType() << (Op == OO_MinusMinus); 5176 } 5177 5178 // Notify the class if it got an assignment operator. 5179 if (Op == OO_Equal) { 5180 // Would have returned earlier otherwise. 5181 assert(isa<CXXMethodDecl>(FnDecl) && 5182 "Overloaded = not member, but not filtered."); 5183 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5184 Method->getParent()->addedAssignmentOperator(Context, Method); 5185 } 5186 5187 return false; 5188} 5189 5190/// CheckLiteralOperatorDeclaration - Check whether the declaration 5191/// of this literal operator function is well-formed. If so, returns 5192/// false; otherwise, emits appropriate diagnostics and returns true. 5193bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5194 DeclContext *DC = FnDecl->getDeclContext(); 5195 Decl::Kind Kind = DC->getDeclKind(); 5196 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5197 Kind != Decl::LinkageSpec) { 5198 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5199 << FnDecl->getDeclName(); 5200 return true; 5201 } 5202 5203 bool Valid = false; 5204 5205 // template <char...> type operator "" name() is the only valid template 5206 // signature, and the only valid signature with no parameters. 5207 if (FnDecl->param_size() == 0) { 5208 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5209 // Must have only one template parameter 5210 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5211 if (Params->size() == 1) { 5212 NonTypeTemplateParmDecl *PmDecl = 5213 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5214 5215 // The template parameter must be a char parameter pack. 5216 // FIXME: This test will always fail because non-type parameter packs 5217 // have not been implemented. 5218 if (PmDecl && PmDecl->isTemplateParameterPack() && 5219 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5220 Valid = true; 5221 } 5222 } 5223 } else { 5224 // Check the first parameter 5225 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5226 5227 QualType T = (*Param)->getType(); 5228 5229 // unsigned long long int, long double, and any character type are allowed 5230 // as the only parameters. 5231 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5232 Context.hasSameType(T, Context.LongDoubleTy) || 5233 Context.hasSameType(T, Context.CharTy) || 5234 Context.hasSameType(T, Context.WCharTy) || 5235 Context.hasSameType(T, Context.Char16Ty) || 5236 Context.hasSameType(T, Context.Char32Ty)) { 5237 if (++Param == FnDecl->param_end()) 5238 Valid = true; 5239 goto FinishedParams; 5240 } 5241 5242 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5243 const PointerType *PT = T->getAs<PointerType>(); 5244 if (!PT) 5245 goto FinishedParams; 5246 T = PT->getPointeeType(); 5247 if (!T.isConstQualified()) 5248 goto FinishedParams; 5249 T = T.getUnqualifiedType(); 5250 5251 // Move on to the second parameter; 5252 ++Param; 5253 5254 // If there is no second parameter, the first must be a const char * 5255 if (Param == FnDecl->param_end()) { 5256 if (Context.hasSameType(T, Context.CharTy)) 5257 Valid = true; 5258 goto FinishedParams; 5259 } 5260 5261 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5262 // are allowed as the first parameter to a two-parameter function 5263 if (!(Context.hasSameType(T, Context.CharTy) || 5264 Context.hasSameType(T, Context.WCharTy) || 5265 Context.hasSameType(T, Context.Char16Ty) || 5266 Context.hasSameType(T, Context.Char32Ty))) 5267 goto FinishedParams; 5268 5269 // The second and final parameter must be an std::size_t 5270 T = (*Param)->getType().getUnqualifiedType(); 5271 if (Context.hasSameType(T, Context.getSizeType()) && 5272 ++Param == FnDecl->param_end()) 5273 Valid = true; 5274 } 5275 5276 // FIXME: This diagnostic is absolutely terrible. 5277FinishedParams: 5278 if (!Valid) { 5279 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5280 << FnDecl->getDeclName(); 5281 return true; 5282 } 5283 5284 return false; 5285} 5286 5287/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5288/// linkage specification, including the language and (if present) 5289/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5290/// the location of the language string literal, which is provided 5291/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5292/// the '{' brace. Otherwise, this linkage specification does not 5293/// have any braces. 5294Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5295 SourceLocation ExternLoc, 5296 SourceLocation LangLoc, 5297 llvm::StringRef Lang, 5298 SourceLocation LBraceLoc) { 5299 LinkageSpecDecl::LanguageIDs Language; 5300 if (Lang == "\"C\"") 5301 Language = LinkageSpecDecl::lang_c; 5302 else if (Lang == "\"C++\"") 5303 Language = LinkageSpecDecl::lang_cxx; 5304 else { 5305 Diag(LangLoc, diag::err_bad_language); 5306 return DeclPtrTy(); 5307 } 5308 5309 // FIXME: Add all the various semantics of linkage specifications 5310 5311 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5312 LangLoc, Language, 5313 LBraceLoc.isValid()); 5314 CurContext->addDecl(D); 5315 PushDeclContext(S, D); 5316 return DeclPtrTy::make(D); 5317} 5318 5319/// ActOnFinishLinkageSpecification - Completely the definition of 5320/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5321/// valid, it's the position of the closing '}' brace in a linkage 5322/// specification that uses braces. 5323Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5324 DeclPtrTy LinkageSpec, 5325 SourceLocation RBraceLoc) { 5326 if (LinkageSpec) 5327 PopDeclContext(); 5328 return LinkageSpec; 5329} 5330 5331/// \brief Perform semantic analysis for the variable declaration that 5332/// occurs within a C++ catch clause, returning the newly-created 5333/// variable. 5334VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5335 TypeSourceInfo *TInfo, 5336 IdentifierInfo *Name, 5337 SourceLocation Loc, 5338 SourceRange Range) { 5339 bool Invalid = false; 5340 5341 // Arrays and functions decay. 5342 if (ExDeclType->isArrayType()) 5343 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5344 else if (ExDeclType->isFunctionType()) 5345 ExDeclType = Context.getPointerType(ExDeclType); 5346 5347 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5348 // The exception-declaration shall not denote a pointer or reference to an 5349 // incomplete type, other than [cv] void*. 5350 // N2844 forbids rvalue references. 5351 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5352 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5353 Invalid = true; 5354 } 5355 5356 // GCC allows catching pointers and references to incomplete types 5357 // as an extension; so do we, but we warn by default. 5358 5359 QualType BaseType = ExDeclType; 5360 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5361 unsigned DK = diag::err_catch_incomplete; 5362 bool IncompleteCatchIsInvalid = true; 5363 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5364 BaseType = Ptr->getPointeeType(); 5365 Mode = 1; 5366 DK = diag::ext_catch_incomplete_ptr; 5367 IncompleteCatchIsInvalid = false; 5368 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5369 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5370 BaseType = Ref->getPointeeType(); 5371 Mode = 2; 5372 DK = diag::ext_catch_incomplete_ref; 5373 IncompleteCatchIsInvalid = false; 5374 } 5375 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5376 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5377 IncompleteCatchIsInvalid) 5378 Invalid = true; 5379 5380 if (!Invalid && !ExDeclType->isDependentType() && 5381 RequireNonAbstractType(Loc, ExDeclType, 5382 diag::err_abstract_type_in_decl, 5383 AbstractVariableType)) 5384 Invalid = true; 5385 5386 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5387 Name, ExDeclType, TInfo, VarDecl::None, 5388 VarDecl::None); 5389 ExDecl->setExceptionVariable(true); 5390 5391 if (!Invalid) { 5392 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5393 // C++ [except.handle]p16: 5394 // The object declared in an exception-declaration or, if the 5395 // exception-declaration does not specify a name, a temporary (12.2) is 5396 // copy-initialized (8.5) from the exception object. [...] 5397 // The object is destroyed when the handler exits, after the destruction 5398 // of any automatic objects initialized within the handler. 5399 // 5400 // We just pretend to initialize the object with itself, then make sure 5401 // it can be destroyed later. 5402 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5403 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5404 Loc, ExDeclType, 0); 5405 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5406 SourceLocation()); 5407 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5408 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5409 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5410 if (Result.isInvalid()) 5411 Invalid = true; 5412 else 5413 FinalizeVarWithDestructor(ExDecl, RecordTy); 5414 } 5415 } 5416 5417 if (Invalid) 5418 ExDecl->setInvalidDecl(); 5419 5420 return ExDecl; 5421} 5422 5423/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5424/// handler. 5425Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5426 TypeSourceInfo *TInfo = 0; 5427 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5428 5429 bool Invalid = D.isInvalidType(); 5430 IdentifierInfo *II = D.getIdentifier(); 5431 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 5432 LookupOrdinaryName, 5433 ForRedeclaration)) { 5434 // The scope should be freshly made just for us. There is just no way 5435 // it contains any previous declaration. 5436 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5437 if (PrevDecl->isTemplateParameter()) { 5438 // Maybe we will complain about the shadowed template parameter. 5439 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5440 } 5441 } 5442 5443 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5444 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5445 << D.getCXXScopeSpec().getRange(); 5446 Invalid = true; 5447 } 5448 5449 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5450 D.getIdentifier(), 5451 D.getIdentifierLoc(), 5452 D.getDeclSpec().getSourceRange()); 5453 5454 if (Invalid) 5455 ExDecl->setInvalidDecl(); 5456 5457 // Add the exception declaration into this scope. 5458 if (II) 5459 PushOnScopeChains(ExDecl, S); 5460 else 5461 CurContext->addDecl(ExDecl); 5462 5463 ProcessDeclAttributes(S, ExDecl, D); 5464 return DeclPtrTy::make(ExDecl); 5465} 5466 5467Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5468 ExprArg assertexpr, 5469 ExprArg assertmessageexpr) { 5470 Expr *AssertExpr = (Expr *)assertexpr.get(); 5471 StringLiteral *AssertMessage = 5472 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5473 5474 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5475 llvm::APSInt Value(32); 5476 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5477 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5478 AssertExpr->getSourceRange(); 5479 return DeclPtrTy(); 5480 } 5481 5482 if (Value == 0) { 5483 Diag(AssertLoc, diag::err_static_assert_failed) 5484 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5485 } 5486 } 5487 5488 assertexpr.release(); 5489 assertmessageexpr.release(); 5490 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5491 AssertExpr, AssertMessage); 5492 5493 CurContext->addDecl(Decl); 5494 return DeclPtrTy::make(Decl); 5495} 5496 5497/// \brief Perform semantic analysis of the given friend type declaration. 5498/// 5499/// \returns A friend declaration that. 5500FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 5501 TypeSourceInfo *TSInfo) { 5502 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 5503 5504 QualType T = TSInfo->getType(); 5505 SourceRange TypeRange = TSInfo->getTypeLoc().getSourceRange(); 5506 5507 if (!getLangOptions().CPlusPlus0x) { 5508 // C++03 [class.friend]p2: 5509 // An elaborated-type-specifier shall be used in a friend declaration 5510 // for a class.* 5511 // 5512 // * The class-key of the elaborated-type-specifier is required. 5513 if (!ActiveTemplateInstantiations.empty()) { 5514 // Do not complain about the form of friend template types during 5515 // template instantiation; we will already have complained when the 5516 // template was declared. 5517 } else if (!T->isElaboratedTypeSpecifier()) { 5518 // If we evaluated the type to a record type, suggest putting 5519 // a tag in front. 5520 if (const RecordType *RT = T->getAs<RecordType>()) { 5521 RecordDecl *RD = RT->getDecl(); 5522 5523 std::string InsertionText = std::string(" ") + RD->getKindName(); 5524 5525 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 5526 << (unsigned) RD->getTagKind() 5527 << T 5528 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 5529 InsertionText); 5530 } else { 5531 Diag(FriendLoc, diag::ext_nonclass_type_friend) 5532 << T 5533 << SourceRange(FriendLoc, TypeRange.getEnd()); 5534 } 5535 } else if (T->getAs<EnumType>()) { 5536 Diag(FriendLoc, diag::ext_enum_friend) 5537 << T 5538 << SourceRange(FriendLoc, TypeRange.getEnd()); 5539 } 5540 } 5541 5542 // C++0x [class.friend]p3: 5543 // If the type specifier in a friend declaration designates a (possibly 5544 // cv-qualified) class type, that class is declared as a friend; otherwise, 5545 // the friend declaration is ignored. 5546 5547 // FIXME: C++0x has some syntactic restrictions on friend type declarations 5548 // in [class.friend]p3 that we do not implement. 5549 5550 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 5551} 5552 5553/// Handle a friend type declaration. This works in tandem with 5554/// ActOnTag. 5555/// 5556/// Notes on friend class templates: 5557/// 5558/// We generally treat friend class declarations as if they were 5559/// declaring a class. So, for example, the elaborated type specifier 5560/// in a friend declaration is required to obey the restrictions of a 5561/// class-head (i.e. no typedefs in the scope chain), template 5562/// parameters are required to match up with simple template-ids, &c. 5563/// However, unlike when declaring a template specialization, it's 5564/// okay to refer to a template specialization without an empty 5565/// template parameter declaration, e.g. 5566/// friend class A<T>::B<unsigned>; 5567/// We permit this as a special case; if there are any template 5568/// parameters present at all, require proper matching, i.e. 5569/// template <> template <class T> friend class A<int>::B; 5570Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5571 MultiTemplateParamsArg TempParams) { 5572 SourceLocation Loc = DS.getSourceRange().getBegin(); 5573 5574 assert(DS.isFriendSpecified()); 5575 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5576 5577 // Try to convert the decl specifier to a type. This works for 5578 // friend templates because ActOnTag never produces a ClassTemplateDecl 5579 // for a TUK_Friend. 5580 Declarator TheDeclarator(DS, Declarator::MemberContext); 5581 TypeSourceInfo *TSI; 5582 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5583 if (TheDeclarator.isInvalidType()) 5584 return DeclPtrTy(); 5585 5586 if (!TSI) 5587 TSI = Context.getTrivialTypeSourceInfo(T, DS.getSourceRange().getBegin()); 5588 5589 // This is definitely an error in C++98. It's probably meant to 5590 // be forbidden in C++0x, too, but the specification is just 5591 // poorly written. 5592 // 5593 // The problem is with declarations like the following: 5594 // template <T> friend A<T>::foo; 5595 // where deciding whether a class C is a friend or not now hinges 5596 // on whether there exists an instantiation of A that causes 5597 // 'foo' to equal C. There are restrictions on class-heads 5598 // (which we declare (by fiat) elaborated friend declarations to 5599 // be) that makes this tractable. 5600 // 5601 // FIXME: handle "template <> friend class A<T>;", which 5602 // is possibly well-formed? Who even knows? 5603 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5604 Diag(Loc, diag::err_tagless_friend_type_template) 5605 << DS.getSourceRange(); 5606 return DeclPtrTy(); 5607 } 5608 5609 // C++98 [class.friend]p1: A friend of a class is a function 5610 // or class that is not a member of the class . . . 5611 // This is fixed in DR77, which just barely didn't make the C++03 5612 // deadline. It's also a very silly restriction that seriously 5613 // affects inner classes and which nobody else seems to implement; 5614 // thus we never diagnose it, not even in -pedantic. 5615 // 5616 // But note that we could warn about it: it's always useless to 5617 // friend one of your own members (it's not, however, worthless to 5618 // friend a member of an arbitrary specialization of your template). 5619 5620 Decl *D; 5621 if (unsigned NumTempParamLists = TempParams.size()) 5622 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5623 NumTempParamLists, 5624 (TemplateParameterList**) TempParams.release(), 5625 TSI, 5626 DS.getFriendSpecLoc()); 5627 else 5628 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5629 5630 if (!D) 5631 return DeclPtrTy(); 5632 5633 D->setAccess(AS_public); 5634 CurContext->addDecl(D); 5635 5636 return DeclPtrTy::make(D); 5637} 5638 5639Sema::DeclPtrTy 5640Sema::ActOnFriendFunctionDecl(Scope *S, 5641 Declarator &D, 5642 bool IsDefinition, 5643 MultiTemplateParamsArg TemplateParams) { 5644 const DeclSpec &DS = D.getDeclSpec(); 5645 5646 assert(DS.isFriendSpecified()); 5647 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5648 5649 SourceLocation Loc = D.getIdentifierLoc(); 5650 TypeSourceInfo *TInfo = 0; 5651 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5652 5653 // C++ [class.friend]p1 5654 // A friend of a class is a function or class.... 5655 // Note that this sees through typedefs, which is intended. 5656 // It *doesn't* see through dependent types, which is correct 5657 // according to [temp.arg.type]p3: 5658 // If a declaration acquires a function type through a 5659 // type dependent on a template-parameter and this causes 5660 // a declaration that does not use the syntactic form of a 5661 // function declarator to have a function type, the program 5662 // is ill-formed. 5663 if (!T->isFunctionType()) { 5664 Diag(Loc, diag::err_unexpected_friend); 5665 5666 // It might be worthwhile to try to recover by creating an 5667 // appropriate declaration. 5668 return DeclPtrTy(); 5669 } 5670 5671 // C++ [namespace.memdef]p3 5672 // - If a friend declaration in a non-local class first declares a 5673 // class or function, the friend class or function is a member 5674 // of the innermost enclosing namespace. 5675 // - The name of the friend is not found by simple name lookup 5676 // until a matching declaration is provided in that namespace 5677 // scope (either before or after the class declaration granting 5678 // friendship). 5679 // - If a friend function is called, its name may be found by the 5680 // name lookup that considers functions from namespaces and 5681 // classes associated with the types of the function arguments. 5682 // - When looking for a prior declaration of a class or a function 5683 // declared as a friend, scopes outside the innermost enclosing 5684 // namespace scope are not considered. 5685 5686 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5687 DeclarationName Name = GetNameForDeclarator(D); 5688 assert(Name); 5689 5690 // The context we found the declaration in, or in which we should 5691 // create the declaration. 5692 DeclContext *DC; 5693 5694 // FIXME: handle local classes 5695 5696 // Recover from invalid scope qualifiers as if they just weren't there. 5697 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5698 ForRedeclaration); 5699 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5700 DC = computeDeclContext(ScopeQual); 5701 5702 // FIXME: handle dependent contexts 5703 if (!DC) return DeclPtrTy(); 5704 if (RequireCompleteDeclContext(ScopeQual, DC)) return DeclPtrTy(); 5705 5706 LookupQualifiedName(Previous, DC); 5707 5708 // If searching in that context implicitly found a declaration in 5709 // a different context, treat it like it wasn't found at all. 5710 // TODO: better diagnostics for this case. Suggesting the right 5711 // qualified scope would be nice... 5712 // FIXME: getRepresentativeDecl() is not right here at all 5713 if (Previous.empty() || 5714 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5715 D.setInvalidType(); 5716 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5717 return DeclPtrTy(); 5718 } 5719 5720 // C++ [class.friend]p1: A friend of a class is a function or 5721 // class that is not a member of the class . . . 5722 if (DC->Equals(CurContext)) 5723 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5724 5725 // Otherwise walk out to the nearest namespace scope looking for matches. 5726 } else { 5727 // TODO: handle local class contexts. 5728 5729 DC = CurContext; 5730 while (true) { 5731 // Skip class contexts. If someone can cite chapter and verse 5732 // for this behavior, that would be nice --- it's what GCC and 5733 // EDG do, and it seems like a reasonable intent, but the spec 5734 // really only says that checks for unqualified existing 5735 // declarations should stop at the nearest enclosing namespace, 5736 // not that they should only consider the nearest enclosing 5737 // namespace. 5738 while (DC->isRecord()) 5739 DC = DC->getParent(); 5740 5741 LookupQualifiedName(Previous, DC); 5742 5743 // TODO: decide what we think about using declarations. 5744 if (!Previous.empty()) 5745 break; 5746 5747 if (DC->isFileContext()) break; 5748 DC = DC->getParent(); 5749 } 5750 5751 // C++ [class.friend]p1: A friend of a class is a function or 5752 // class that is not a member of the class . . . 5753 // C++0x changes this for both friend types and functions. 5754 // Most C++ 98 compilers do seem to give an error here, so 5755 // we do, too. 5756 if (!Previous.empty() && DC->Equals(CurContext) 5757 && !getLangOptions().CPlusPlus0x) 5758 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5759 } 5760 5761 if (DC->isFileContext()) { 5762 // This implies that it has to be an operator or function. 5763 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5764 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5765 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5766 Diag(Loc, diag::err_introducing_special_friend) << 5767 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5768 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5769 return DeclPtrTy(); 5770 } 5771 } 5772 5773 bool Redeclaration = false; 5774 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5775 move(TemplateParams), 5776 IsDefinition, 5777 Redeclaration); 5778 if (!ND) return DeclPtrTy(); 5779 5780 assert(ND->getDeclContext() == DC); 5781 assert(ND->getLexicalDeclContext() == CurContext); 5782 5783 // Add the function declaration to the appropriate lookup tables, 5784 // adjusting the redeclarations list as necessary. We don't 5785 // want to do this yet if the friending class is dependent. 5786 // 5787 // Also update the scope-based lookup if the target context's 5788 // lookup context is in lexical scope. 5789 if (!CurContext->isDependentContext()) { 5790 DC = DC->getLookupContext(); 5791 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5792 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5793 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5794 } 5795 5796 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5797 D.getIdentifierLoc(), ND, 5798 DS.getFriendSpecLoc()); 5799 FrD->setAccess(AS_public); 5800 CurContext->addDecl(FrD); 5801 5802 return DeclPtrTy::make(ND); 5803} 5804 5805void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5806 AdjustDeclIfTemplate(dcl); 5807 5808 Decl *Dcl = dcl.getAs<Decl>(); 5809 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5810 if (!Fn) { 5811 Diag(DelLoc, diag::err_deleted_non_function); 5812 return; 5813 } 5814 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5815 Diag(DelLoc, diag::err_deleted_decl_not_first); 5816 Diag(Prev->getLocation(), diag::note_previous_declaration); 5817 // If the declaration wasn't the first, we delete the function anyway for 5818 // recovery. 5819 } 5820 Fn->setDeleted(); 5821} 5822 5823static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5824 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5825 ++CI) { 5826 Stmt *SubStmt = *CI; 5827 if (!SubStmt) 5828 continue; 5829 if (isa<ReturnStmt>(SubStmt)) 5830 Self.Diag(SubStmt->getSourceRange().getBegin(), 5831 diag::err_return_in_constructor_handler); 5832 if (!isa<Expr>(SubStmt)) 5833 SearchForReturnInStmt(Self, SubStmt); 5834 } 5835} 5836 5837void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5838 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5839 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5840 SearchForReturnInStmt(*this, Handler); 5841 } 5842} 5843 5844bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5845 const CXXMethodDecl *Old) { 5846 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5847 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5848 5849 if (Context.hasSameType(NewTy, OldTy) || 5850 NewTy->isDependentType() || OldTy->isDependentType()) 5851 return false; 5852 5853 // Check if the return types are covariant 5854 QualType NewClassTy, OldClassTy; 5855 5856 /// Both types must be pointers or references to classes. 5857 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5858 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5859 NewClassTy = NewPT->getPointeeType(); 5860 OldClassTy = OldPT->getPointeeType(); 5861 } 5862 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5863 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5864 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5865 NewClassTy = NewRT->getPointeeType(); 5866 OldClassTy = OldRT->getPointeeType(); 5867 } 5868 } 5869 } 5870 5871 // The return types aren't either both pointers or references to a class type. 5872 if (NewClassTy.isNull()) { 5873 Diag(New->getLocation(), 5874 diag::err_different_return_type_for_overriding_virtual_function) 5875 << New->getDeclName() << NewTy << OldTy; 5876 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5877 5878 return true; 5879 } 5880 5881 // C++ [class.virtual]p6: 5882 // If the return type of D::f differs from the return type of B::f, the 5883 // class type in the return type of D::f shall be complete at the point of 5884 // declaration of D::f or shall be the class type D. 5885 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5886 if (!RT->isBeingDefined() && 5887 RequireCompleteType(New->getLocation(), NewClassTy, 5888 PDiag(diag::err_covariant_return_incomplete) 5889 << New->getDeclName())) 5890 return true; 5891 } 5892 5893 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5894 // Check if the new class derives from the old class. 5895 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5896 Diag(New->getLocation(), 5897 diag::err_covariant_return_not_derived) 5898 << New->getDeclName() << NewTy << OldTy; 5899 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5900 return true; 5901 } 5902 5903 // Check if we the conversion from derived to base is valid. 5904 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5905 diag::err_covariant_return_inaccessible_base, 5906 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5907 // FIXME: Should this point to the return type? 5908 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 5909 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5910 return true; 5911 } 5912 } 5913 5914 // The qualifiers of the return types must be the same. 5915 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5916 Diag(New->getLocation(), 5917 diag::err_covariant_return_type_different_qualifications) 5918 << New->getDeclName() << NewTy << OldTy; 5919 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5920 return true; 5921 }; 5922 5923 5924 // The new class type must have the same or less qualifiers as the old type. 5925 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5926 Diag(New->getLocation(), 5927 diag::err_covariant_return_type_class_type_more_qualified) 5928 << New->getDeclName() << NewTy << OldTy; 5929 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5930 return true; 5931 }; 5932 5933 return false; 5934} 5935 5936bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5937 const CXXMethodDecl *Old) 5938{ 5939 if (Old->hasAttr<FinalAttr>()) { 5940 Diag(New->getLocation(), diag::err_final_function_overridden) 5941 << New->getDeclName(); 5942 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5943 return true; 5944 } 5945 5946 return false; 5947} 5948 5949/// \brief Mark the given method pure. 5950/// 5951/// \param Method the method to be marked pure. 5952/// 5953/// \param InitRange the source range that covers the "0" initializer. 5954bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5955 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5956 Method->setPure(); 5957 5958 // A class is abstract if at least one function is pure virtual. 5959 Method->getParent()->setAbstract(true); 5960 return false; 5961 } 5962 5963 if (!Method->isInvalidDecl()) 5964 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5965 << Method->getDeclName() << InitRange; 5966 return true; 5967} 5968 5969/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5970/// an initializer for the out-of-line declaration 'Dcl'. The scope 5971/// is a fresh scope pushed for just this purpose. 5972/// 5973/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5974/// static data member of class X, names should be looked up in the scope of 5975/// class X. 5976void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5977 // If there is no declaration, there was an error parsing it. 5978 Decl *D = Dcl.getAs<Decl>(); 5979 if (D == 0) return; 5980 5981 // We should only get called for declarations with scope specifiers, like: 5982 // int foo::bar; 5983 assert(D->isOutOfLine()); 5984 EnterDeclaratorContext(S, D->getDeclContext()); 5985} 5986 5987/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5988/// initializer for the out-of-line declaration 'Dcl'. 5989void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5990 // If there is no declaration, there was an error parsing it. 5991 Decl *D = Dcl.getAs<Decl>(); 5992 if (D == 0) return; 5993 5994 assert(D->isOutOfLine()); 5995 ExitDeclaratorContext(S); 5996} 5997 5998/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5999/// C++ if/switch/while/for statement. 6000/// e.g: "if (int x = f()) {...}" 6001Action::DeclResult 6002Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6003 // C++ 6.4p2: 6004 // The declarator shall not specify a function or an array. 6005 // The type-specifier-seq shall not contain typedef and shall not declare a 6006 // new class or enumeration. 6007 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6008 "Parser allowed 'typedef' as storage class of condition decl."); 6009 6010 TypeSourceInfo *TInfo = 0; 6011 TagDecl *OwnedTag = 0; 6012 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 6013 6014 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6015 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6016 // would be created and CXXConditionDeclExpr wants a VarDecl. 6017 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6018 << D.getSourceRange(); 6019 return DeclResult(); 6020 } else if (OwnedTag && OwnedTag->isDefinition()) { 6021 // The type-specifier-seq shall not declare a new class or enumeration. 6022 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6023 } 6024 6025 DeclPtrTy Dcl = ActOnDeclarator(S, D); 6026 if (!Dcl) 6027 return DeclResult(); 6028 6029 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 6030 VD->setDeclaredInCondition(true); 6031 return Dcl; 6032} 6033 6034void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6035 bool DefinitionRequired) { 6036 // Ignore any vtable uses in unevaluated operands or for classes that do 6037 // not have a vtable. 6038 if (!Class->isDynamicClass() || Class->isDependentContext() || 6039 CurContext->isDependentContext() || 6040 ExprEvalContexts.back().Context == Unevaluated) 6041 return; 6042 6043 // Try to insert this class into the map. 6044 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6045 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6046 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6047 if (!Pos.second) { 6048 Pos.first->second = Pos.first->second || DefinitionRequired; 6049 return; 6050 } 6051 6052 // Local classes need to have their virtual members marked 6053 // immediately. For all other classes, we mark their virtual members 6054 // at the end of the translation unit. 6055 if (Class->isLocalClass()) 6056 MarkVirtualMembersReferenced(Loc, Class); 6057 else 6058 VTableUses.push_back(std::make_pair(Class, Loc)); 6059} 6060 6061bool Sema::DefineUsedVTables() { 6062 // If any dynamic classes have their key function defined within 6063 // this translation unit, then those vtables are considered "used" and must 6064 // be emitted. 6065 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6066 if (const CXXMethodDecl *KeyFunction 6067 = Context.getKeyFunction(DynamicClasses[I])) { 6068 const FunctionDecl *Definition = 0; 6069 if (KeyFunction->getBody(Definition) && !Definition->isInlined() && 6070 !Definition->isImplicit()) 6071 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6072 } 6073 } 6074 6075 if (VTableUses.empty()) 6076 return false; 6077 6078 // Note: The VTableUses vector could grow as a result of marking 6079 // the members of a class as "used", so we check the size each 6080 // time through the loop and prefer indices (with are stable) to 6081 // iterators (which are not). 6082 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6083 CXXRecordDecl *Class 6084 = cast_or_null<CXXRecordDecl>(VTableUses[I].first)->getDefinition(); 6085 if (!Class) 6086 continue; 6087 6088 SourceLocation Loc = VTableUses[I].second; 6089 6090 // If this class has a key function, but that key function is 6091 // defined in another translation unit, we don't need to emit the 6092 // vtable even though we're using it. 6093 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6094 if (KeyFunction && !KeyFunction->getBody()) { 6095 switch (KeyFunction->getTemplateSpecializationKind()) { 6096 case TSK_Undeclared: 6097 case TSK_ExplicitSpecialization: 6098 case TSK_ExplicitInstantiationDeclaration: 6099 // The key function is in another translation unit. 6100 continue; 6101 6102 case TSK_ExplicitInstantiationDefinition: 6103 case TSK_ImplicitInstantiation: 6104 // We will be instantiating the key function. 6105 break; 6106 } 6107 } else if (!KeyFunction) { 6108 // If we have a class with no key function that is the subject 6109 // of an explicit instantiation declaration, suppress the 6110 // vtable; it will live with the explicit instantiation 6111 // definition. 6112 bool IsExplicitInstantiationDeclaration 6113 = Class->getTemplateSpecializationKind() 6114 == TSK_ExplicitInstantiationDeclaration; 6115 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6116 REnd = Class->redecls_end(); 6117 R != REnd; ++R) { 6118 TemplateSpecializationKind TSK 6119 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6120 if (TSK == TSK_ExplicitInstantiationDeclaration) 6121 IsExplicitInstantiationDeclaration = true; 6122 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6123 IsExplicitInstantiationDeclaration = false; 6124 break; 6125 } 6126 } 6127 6128 if (IsExplicitInstantiationDeclaration) 6129 continue; 6130 } 6131 6132 // Mark all of the virtual members of this class as referenced, so 6133 // that we can build a vtable. Then, tell the AST consumer that a 6134 // vtable for this class is required. 6135 MarkVirtualMembersReferenced(Loc, Class); 6136 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6137 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6138 6139 // Optionally warn if we're emitting a weak vtable. 6140 if (Class->getLinkage() == ExternalLinkage && 6141 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6142 if (!KeyFunction || (KeyFunction->getBody() && KeyFunction->isInlined())) 6143 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6144 } 6145 } 6146 VTableUses.clear(); 6147 6148 return true; 6149} 6150 6151void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6152 const CXXRecordDecl *RD) { 6153 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6154 e = RD->method_end(); i != e; ++i) { 6155 CXXMethodDecl *MD = *i; 6156 6157 // C++ [basic.def.odr]p2: 6158 // [...] A virtual member function is used if it is not pure. [...] 6159 if (MD->isVirtual() && !MD->isPure()) 6160 MarkDeclarationReferenced(Loc, MD); 6161 } 6162 6163 // Only classes that have virtual bases need a VTT. 6164 if (RD->getNumVBases() == 0) 6165 return; 6166 6167 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6168 e = RD->bases_end(); i != e; ++i) { 6169 const CXXRecordDecl *Base = 6170 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6171 if (i->isVirtual()) 6172 continue; 6173 if (Base->getNumVBases() == 0) 6174 continue; 6175 MarkVirtualMembersReferenced(Loc, Base); 6176 } 6177} 6178 6179/// SetIvarInitializers - This routine builds initialization ASTs for the 6180/// Objective-C implementation whose ivars need be initialized. 6181void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6182 if (!getLangOptions().CPlusPlus) 6183 return; 6184 if (const ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6185 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6186 CollectIvarsToConstructOrDestruct(OID, ivars); 6187 if (ivars.empty()) 6188 return; 6189 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6190 for (unsigned i = 0; i < ivars.size(); i++) { 6191 FieldDecl *Field = ivars[i]; 6192 CXXBaseOrMemberInitializer *Member; 6193 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6194 InitializationKind InitKind = 6195 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6196 6197 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6198 Sema::OwningExprResult MemberInit = 6199 InitSeq.Perform(*this, InitEntity, InitKind, 6200 Sema::MultiExprArg(*this, 0, 0)); 6201 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 6202 // Note, MemberInit could actually come back empty if no initialization 6203 // is required (e.g., because it would call a trivial default constructor) 6204 if (!MemberInit.get() || MemberInit.isInvalid()) 6205 continue; 6206 6207 Member = 6208 new (Context) CXXBaseOrMemberInitializer(Context, 6209 Field, SourceLocation(), 6210 SourceLocation(), 6211 MemberInit.takeAs<Expr>(), 6212 SourceLocation()); 6213 AllToInit.push_back(Member); 6214 } 6215 ObjCImplementation->setIvarInitializers(Context, 6216 AllToInit.data(), AllToInit.size()); 6217 } 6218} 6219