SemaDeclCXX.cpp revision 80638c5e6395344c1e6096542b0ff3b8bfb2139e
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/RecordLayout.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/TypeLoc.h" 23#include "clang/AST/TypeOrdering.h" 24#include "clang/AST/StmtVisitor.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Parse/Template.h" 27#include "clang/Basic/PartialDiagnostic.h" 28#include "clang/Lex/Preprocessor.h" 29#include "llvm/ADT/STLExtras.h" 30#include <map> 31#include <set> 32 33using namespace clang; 34 35//===----------------------------------------------------------------------===// 36// CheckDefaultArgumentVisitor 37//===----------------------------------------------------------------------===// 38 39namespace { 40 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 41 /// the default argument of a parameter to determine whether it 42 /// contains any ill-formed subexpressions. For example, this will 43 /// diagnose the use of local variables or parameters within the 44 /// default argument expression. 45 class CheckDefaultArgumentVisitor 46 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 47 Expr *DefaultArg; 48 Sema *S; 49 50 public: 51 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 52 : DefaultArg(defarg), S(s) {} 53 54 bool VisitExpr(Expr *Node); 55 bool VisitDeclRefExpr(DeclRefExpr *DRE); 56 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 57 }; 58 59 /// VisitExpr - Visit all of the children of this expression. 60 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 61 bool IsInvalid = false; 62 for (Stmt::child_iterator I = Node->child_begin(), 63 E = Node->child_end(); I != E; ++I) 64 IsInvalid |= Visit(*I); 65 return IsInvalid; 66 } 67 68 /// VisitDeclRefExpr - Visit a reference to a declaration, to 69 /// determine whether this declaration can be used in the default 70 /// argument expression. 71 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 72 NamedDecl *Decl = DRE->getDecl(); 73 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 74 // C++ [dcl.fct.default]p9 75 // Default arguments are evaluated each time the function is 76 // called. The order of evaluation of function arguments is 77 // unspecified. Consequently, parameters of a function shall not 78 // be used in default argument expressions, even if they are not 79 // evaluated. Parameters of a function declared before a default 80 // argument expression are in scope and can hide namespace and 81 // class member names. 82 return S->Diag(DRE->getSourceRange().getBegin(), 83 diag::err_param_default_argument_references_param) 84 << Param->getDeclName() << DefaultArg->getSourceRange(); 85 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 86 // C++ [dcl.fct.default]p7 87 // Local variables shall not be used in default argument 88 // expressions. 89 if (VDecl->isBlockVarDecl()) 90 return S->Diag(DRE->getSourceRange().getBegin(), 91 diag::err_param_default_argument_references_local) 92 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 93 } 94 95 return false; 96 } 97 98 /// VisitCXXThisExpr - Visit a C++ "this" expression. 99 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 100 // C++ [dcl.fct.default]p8: 101 // The keyword this shall not be used in a default argument of a 102 // member function. 103 return S->Diag(ThisE->getSourceRange().getBegin(), 104 diag::err_param_default_argument_references_this) 105 << ThisE->getSourceRange(); 106 } 107} 108 109bool 110Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 111 SourceLocation EqualLoc) { 112 if (RequireCompleteType(Param->getLocation(), Param->getType(), 113 diag::err_typecheck_decl_incomplete_type)) { 114 Param->setInvalidDecl(); 115 return true; 116 } 117 118 Expr *Arg = (Expr *)DefaultArg.get(); 119 120 // C++ [dcl.fct.default]p5 121 // A default argument expression is implicitly converted (clause 122 // 4) to the parameter type. The default argument expression has 123 // the same semantic constraints as the initializer expression in 124 // a declaration of a variable of the parameter type, using the 125 // copy-initialization semantics (8.5). 126 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 127 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 128 EqualLoc); 129 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 130 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 131 MultiExprArg(*this, (void**)&Arg, 1)); 132 if (Result.isInvalid()) 133 return true; 134 Arg = Result.takeAs<Expr>(); 135 136 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 137 138 // Okay: add the default argument to the parameter 139 Param->setDefaultArg(Arg); 140 141 DefaultArg.release(); 142 143 return false; 144} 145 146/// ActOnParamDefaultArgument - Check whether the default argument 147/// provided for a function parameter is well-formed. If so, attach it 148/// to the parameter declaration. 149void 150Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 151 ExprArg defarg) { 152 if (!param || !defarg.get()) 153 return; 154 155 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 156 UnparsedDefaultArgLocs.erase(Param); 157 158 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 159 160 // Default arguments are only permitted in C++ 161 if (!getLangOptions().CPlusPlus) { 162 Diag(EqualLoc, diag::err_param_default_argument) 163 << DefaultArg->getSourceRange(); 164 Param->setInvalidDecl(); 165 return; 166 } 167 168 // Check that the default argument is well-formed 169 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 170 if (DefaultArgChecker.Visit(DefaultArg.get())) { 171 Param->setInvalidDecl(); 172 return; 173 } 174 175 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 176} 177 178/// ActOnParamUnparsedDefaultArgument - We've seen a default 179/// argument for a function parameter, but we can't parse it yet 180/// because we're inside a class definition. Note that this default 181/// argument will be parsed later. 182void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 183 SourceLocation EqualLoc, 184 SourceLocation ArgLoc) { 185 if (!param) 186 return; 187 188 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 189 if (Param) 190 Param->setUnparsedDefaultArg(); 191 192 UnparsedDefaultArgLocs[Param] = ArgLoc; 193} 194 195/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 196/// the default argument for the parameter param failed. 197void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 198 if (!param) 199 return; 200 201 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 202 203 Param->setInvalidDecl(); 204 205 UnparsedDefaultArgLocs.erase(Param); 206} 207 208/// CheckExtraCXXDefaultArguments - Check for any extra default 209/// arguments in the declarator, which is not a function declaration 210/// or definition and therefore is not permitted to have default 211/// arguments. This routine should be invoked for every declarator 212/// that is not a function declaration or definition. 213void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 214 // C++ [dcl.fct.default]p3 215 // A default argument expression shall be specified only in the 216 // parameter-declaration-clause of a function declaration or in a 217 // template-parameter (14.1). It shall not be specified for a 218 // parameter pack. If it is specified in a 219 // parameter-declaration-clause, it shall not occur within a 220 // declarator or abstract-declarator of a parameter-declaration. 221 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 222 DeclaratorChunk &chunk = D.getTypeObject(i); 223 if (chunk.Kind == DeclaratorChunk::Function) { 224 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 225 ParmVarDecl *Param = 226 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 227 if (Param->hasUnparsedDefaultArg()) { 228 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 229 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 230 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 231 delete Toks; 232 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 233 } else if (Param->getDefaultArg()) { 234 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 235 << Param->getDefaultArg()->getSourceRange(); 236 Param->setDefaultArg(0); 237 } 238 } 239 } 240 } 241} 242 243// MergeCXXFunctionDecl - Merge two declarations of the same C++ 244// function, once we already know that they have the same 245// type. Subroutine of MergeFunctionDecl. Returns true if there was an 246// error, false otherwise. 247bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 248 bool Invalid = false; 249 250 // C++ [dcl.fct.default]p4: 251 // For non-template functions, default arguments can be added in 252 // later declarations of a function in the same 253 // scope. Declarations in different scopes have completely 254 // distinct sets of default arguments. That is, declarations in 255 // inner scopes do not acquire default arguments from 256 // declarations in outer scopes, and vice versa. In a given 257 // function declaration, all parameters subsequent to a 258 // parameter with a default argument shall have default 259 // arguments supplied in this or previous declarations. A 260 // default argument shall not be redefined by a later 261 // declaration (not even to the same value). 262 // 263 // C++ [dcl.fct.default]p6: 264 // Except for member functions of class templates, the default arguments 265 // in a member function definition that appears outside of the class 266 // definition are added to the set of default arguments provided by the 267 // member function declaration in the class definition. 268 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 269 ParmVarDecl *OldParam = Old->getParamDecl(p); 270 ParmVarDecl *NewParam = New->getParamDecl(p); 271 272 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 273 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 274 // hint here. Alternatively, we could walk the type-source information 275 // for NewParam to find the last source location in the type... but it 276 // isn't worth the effort right now. This is the kind of test case that 277 // is hard to get right: 278 279 // int f(int); 280 // void g(int (*fp)(int) = f); 281 // void g(int (*fp)(int) = &f); 282 Diag(NewParam->getLocation(), 283 diag::err_param_default_argument_redefinition) 284 << NewParam->getDefaultArgRange(); 285 286 // Look for the function declaration where the default argument was 287 // actually written, which may be a declaration prior to Old. 288 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 289 Older; Older = Older->getPreviousDeclaration()) { 290 if (!Older->getParamDecl(p)->hasDefaultArg()) 291 break; 292 293 OldParam = Older->getParamDecl(p); 294 } 295 296 Diag(OldParam->getLocation(), diag::note_previous_definition) 297 << OldParam->getDefaultArgRange(); 298 Invalid = true; 299 } else if (OldParam->hasDefaultArg()) { 300 // Merge the old default argument into the new parameter 301 NewParam->setHasInheritedDefaultArg(); 302 if (OldParam->hasUninstantiatedDefaultArg()) 303 NewParam->setUninstantiatedDefaultArg( 304 OldParam->getUninstantiatedDefaultArg()); 305 else 306 NewParam->setDefaultArg(OldParam->getDefaultArg()); 307 } else if (NewParam->hasDefaultArg()) { 308 if (New->getDescribedFunctionTemplate()) { 309 // Paragraph 4, quoted above, only applies to non-template functions. 310 Diag(NewParam->getLocation(), 311 diag::err_param_default_argument_template_redecl) 312 << NewParam->getDefaultArgRange(); 313 Diag(Old->getLocation(), diag::note_template_prev_declaration) 314 << false; 315 } else if (New->getTemplateSpecializationKind() 316 != TSK_ImplicitInstantiation && 317 New->getTemplateSpecializationKind() != TSK_Undeclared) { 318 // C++ [temp.expr.spec]p21: 319 // Default function arguments shall not be specified in a declaration 320 // or a definition for one of the following explicit specializations: 321 // - the explicit specialization of a function template; 322 // - the explicit specialization of a member function template; 323 // - the explicit specialization of a member function of a class 324 // template where the class template specialization to which the 325 // member function specialization belongs is implicitly 326 // instantiated. 327 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 328 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 329 << New->getDeclName() 330 << NewParam->getDefaultArgRange(); 331 } else if (New->getDeclContext()->isDependentContext()) { 332 // C++ [dcl.fct.default]p6 (DR217): 333 // Default arguments for a member function of a class template shall 334 // be specified on the initial declaration of the member function 335 // within the class template. 336 // 337 // Reading the tea leaves a bit in DR217 and its reference to DR205 338 // leads me to the conclusion that one cannot add default function 339 // arguments for an out-of-line definition of a member function of a 340 // dependent type. 341 int WhichKind = 2; 342 if (CXXRecordDecl *Record 343 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 344 if (Record->getDescribedClassTemplate()) 345 WhichKind = 0; 346 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 347 WhichKind = 1; 348 else 349 WhichKind = 2; 350 } 351 352 Diag(NewParam->getLocation(), 353 diag::err_param_default_argument_member_template_redecl) 354 << WhichKind 355 << NewParam->getDefaultArgRange(); 356 } 357 } 358 } 359 360 if (CheckEquivalentExceptionSpec(Old, New)) 361 Invalid = true; 362 363 return Invalid; 364} 365 366/// CheckCXXDefaultArguments - Verify that the default arguments for a 367/// function declaration are well-formed according to C++ 368/// [dcl.fct.default]. 369void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 370 unsigned NumParams = FD->getNumParams(); 371 unsigned p; 372 373 // Find first parameter with a default argument 374 for (p = 0; p < NumParams; ++p) { 375 ParmVarDecl *Param = FD->getParamDecl(p); 376 if (Param->hasDefaultArg()) 377 break; 378 } 379 380 // C++ [dcl.fct.default]p4: 381 // In a given function declaration, all parameters 382 // subsequent to a parameter with a default argument shall 383 // have default arguments supplied in this or previous 384 // declarations. A default argument shall not be redefined 385 // by a later declaration (not even to the same value). 386 unsigned LastMissingDefaultArg = 0; 387 for (; p < NumParams; ++p) { 388 ParmVarDecl *Param = FD->getParamDecl(p); 389 if (!Param->hasDefaultArg()) { 390 if (Param->isInvalidDecl()) 391 /* We already complained about this parameter. */; 392 else if (Param->getIdentifier()) 393 Diag(Param->getLocation(), 394 diag::err_param_default_argument_missing_name) 395 << Param->getIdentifier(); 396 else 397 Diag(Param->getLocation(), 398 diag::err_param_default_argument_missing); 399 400 LastMissingDefaultArg = p; 401 } 402 } 403 404 if (LastMissingDefaultArg > 0) { 405 // Some default arguments were missing. Clear out all of the 406 // default arguments up to (and including) the last missing 407 // default argument, so that we leave the function parameters 408 // in a semantically valid state. 409 for (p = 0; p <= LastMissingDefaultArg; ++p) { 410 ParmVarDecl *Param = FD->getParamDecl(p); 411 if (Param->hasDefaultArg()) { 412 if (!Param->hasUnparsedDefaultArg()) 413 Param->getDefaultArg()->Destroy(Context); 414 Param->setDefaultArg(0); 415 } 416 } 417 } 418} 419 420/// isCurrentClassName - Determine whether the identifier II is the 421/// name of the class type currently being defined. In the case of 422/// nested classes, this will only return true if II is the name of 423/// the innermost class. 424bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 425 const CXXScopeSpec *SS) { 426 assert(getLangOptions().CPlusPlus && "No class names in C!"); 427 428 CXXRecordDecl *CurDecl; 429 if (SS && SS->isSet() && !SS->isInvalid()) { 430 DeclContext *DC = computeDeclContext(*SS, true); 431 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 432 } else 433 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 434 435 if (CurDecl && CurDecl->getIdentifier()) 436 return &II == CurDecl->getIdentifier(); 437 else 438 return false; 439} 440 441/// \brief Check the validity of a C++ base class specifier. 442/// 443/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 444/// and returns NULL otherwise. 445CXXBaseSpecifier * 446Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 447 SourceRange SpecifierRange, 448 bool Virtual, AccessSpecifier Access, 449 QualType BaseType, 450 SourceLocation BaseLoc) { 451 // C++ [class.union]p1: 452 // A union shall not have base classes. 453 if (Class->isUnion()) { 454 Diag(Class->getLocation(), diag::err_base_clause_on_union) 455 << SpecifierRange; 456 return 0; 457 } 458 459 if (BaseType->isDependentType()) 460 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 461 Class->getTagKind() == RecordDecl::TK_class, 462 Access, BaseType); 463 464 // Base specifiers must be record types. 465 if (!BaseType->isRecordType()) { 466 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 467 return 0; 468 } 469 470 // C++ [class.union]p1: 471 // A union shall not be used as a base class. 472 if (BaseType->isUnionType()) { 473 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 474 return 0; 475 } 476 477 // C++ [class.derived]p2: 478 // The class-name in a base-specifier shall not be an incompletely 479 // defined class. 480 if (RequireCompleteType(BaseLoc, BaseType, 481 PDiag(diag::err_incomplete_base_class) 482 << SpecifierRange)) 483 return 0; 484 485 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 486 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 487 assert(BaseDecl && "Record type has no declaration"); 488 BaseDecl = BaseDecl->getDefinition(); 489 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 490 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 491 assert(CXXBaseDecl && "Base type is not a C++ type"); 492 493 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 494 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 495 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 496 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 497 << BaseType; 498 return 0; 499 } 500 501 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 502 503 // Create the base specifier. 504 // FIXME: Allocate via ASTContext? 505 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 506 Class->getTagKind() == RecordDecl::TK_class, 507 Access, BaseType); 508} 509 510void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 511 const CXXRecordDecl *BaseClass, 512 bool BaseIsVirtual) { 513 // A class with a non-empty base class is not empty. 514 // FIXME: Standard ref? 515 if (!BaseClass->isEmpty()) 516 Class->setEmpty(false); 517 518 // C++ [class.virtual]p1: 519 // A class that [...] inherits a virtual function is called a polymorphic 520 // class. 521 if (BaseClass->isPolymorphic()) 522 Class->setPolymorphic(true); 523 524 // C++ [dcl.init.aggr]p1: 525 // An aggregate is [...] a class with [...] no base classes [...]. 526 Class->setAggregate(false); 527 528 // C++ [class]p4: 529 // A POD-struct is an aggregate class... 530 Class->setPOD(false); 531 532 if (BaseIsVirtual) { 533 // C++ [class.ctor]p5: 534 // A constructor is trivial if its class has no virtual base classes. 535 Class->setHasTrivialConstructor(false); 536 537 // C++ [class.copy]p6: 538 // A copy constructor is trivial if its class has no virtual base classes. 539 Class->setHasTrivialCopyConstructor(false); 540 541 // C++ [class.copy]p11: 542 // A copy assignment operator is trivial if its class has no virtual 543 // base classes. 544 Class->setHasTrivialCopyAssignment(false); 545 546 // C++0x [meta.unary.prop] is_empty: 547 // T is a class type, but not a union type, with ... no virtual base 548 // classes 549 Class->setEmpty(false); 550 } else { 551 // C++ [class.ctor]p5: 552 // A constructor is trivial if all the direct base classes of its 553 // class have trivial constructors. 554 if (!BaseClass->hasTrivialConstructor()) 555 Class->setHasTrivialConstructor(false); 556 557 // C++ [class.copy]p6: 558 // A copy constructor is trivial if all the direct base classes of its 559 // class have trivial copy constructors. 560 if (!BaseClass->hasTrivialCopyConstructor()) 561 Class->setHasTrivialCopyConstructor(false); 562 563 // C++ [class.copy]p11: 564 // A copy assignment operator is trivial if all the direct base classes 565 // of its class have trivial copy assignment operators. 566 if (!BaseClass->hasTrivialCopyAssignment()) 567 Class->setHasTrivialCopyAssignment(false); 568 } 569 570 // C++ [class.ctor]p3: 571 // A destructor is trivial if all the direct base classes of its class 572 // have trivial destructors. 573 if (!BaseClass->hasTrivialDestructor()) 574 Class->setHasTrivialDestructor(false); 575} 576 577/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 578/// one entry in the base class list of a class specifier, for 579/// example: 580/// class foo : public bar, virtual private baz { 581/// 'public bar' and 'virtual private baz' are each base-specifiers. 582Sema::BaseResult 583Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 584 bool Virtual, AccessSpecifier Access, 585 TypeTy *basetype, SourceLocation BaseLoc) { 586 if (!classdecl) 587 return true; 588 589 AdjustDeclIfTemplate(classdecl); 590 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 591 if (!Class) 592 return true; 593 594 QualType BaseType = GetTypeFromParser(basetype); 595 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 596 Virtual, Access, 597 BaseType, BaseLoc)) 598 return BaseSpec; 599 600 return true; 601} 602 603/// \brief Performs the actual work of attaching the given base class 604/// specifiers to a C++ class. 605bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 606 unsigned NumBases) { 607 if (NumBases == 0) 608 return false; 609 610 // Used to keep track of which base types we have already seen, so 611 // that we can properly diagnose redundant direct base types. Note 612 // that the key is always the unqualified canonical type of the base 613 // class. 614 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 615 616 // Copy non-redundant base specifiers into permanent storage. 617 unsigned NumGoodBases = 0; 618 bool Invalid = false; 619 for (unsigned idx = 0; idx < NumBases; ++idx) { 620 QualType NewBaseType 621 = Context.getCanonicalType(Bases[idx]->getType()); 622 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 623 624 if (KnownBaseTypes[NewBaseType]) { 625 // C++ [class.mi]p3: 626 // A class shall not be specified as a direct base class of a 627 // derived class more than once. 628 Diag(Bases[idx]->getSourceRange().getBegin(), 629 diag::err_duplicate_base_class) 630 << KnownBaseTypes[NewBaseType]->getType() 631 << Bases[idx]->getSourceRange(); 632 633 // Delete the duplicate base class specifier; we're going to 634 // overwrite its pointer later. 635 Context.Deallocate(Bases[idx]); 636 637 Invalid = true; 638 } else { 639 // Okay, add this new base class. 640 KnownBaseTypes[NewBaseType] = Bases[idx]; 641 Bases[NumGoodBases++] = Bases[idx]; 642 } 643 } 644 645 // Attach the remaining base class specifiers to the derived class. 646 Class->setBases(Bases, NumGoodBases); 647 648 // Delete the remaining (good) base class specifiers, since their 649 // data has been copied into the CXXRecordDecl. 650 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 651 Context.Deallocate(Bases[idx]); 652 653 return Invalid; 654} 655 656/// ActOnBaseSpecifiers - Attach the given base specifiers to the 657/// class, after checking whether there are any duplicate base 658/// classes. 659void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 660 unsigned NumBases) { 661 if (!ClassDecl || !Bases || !NumBases) 662 return; 663 664 AdjustDeclIfTemplate(ClassDecl); 665 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 666 (CXXBaseSpecifier**)(Bases), NumBases); 667} 668 669static CXXRecordDecl *GetClassForType(QualType T) { 670 if (const RecordType *RT = T->getAs<RecordType>()) 671 return cast<CXXRecordDecl>(RT->getDecl()); 672 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 673 return ICT->getDecl(); 674 else 675 return 0; 676} 677 678/// \brief Determine whether the type \p Derived is a C++ class that is 679/// derived from the type \p Base. 680bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 681 if (!getLangOptions().CPlusPlus) 682 return false; 683 684 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 685 if (!DerivedRD) 686 return false; 687 688 CXXRecordDecl *BaseRD = GetClassForType(Base); 689 if (!BaseRD) 690 return false; 691 692 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 693 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 694} 695 696/// \brief Determine whether the type \p Derived is a C++ class that is 697/// derived from the type \p Base. 698bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 699 if (!getLangOptions().CPlusPlus) 700 return false; 701 702 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 703 if (!DerivedRD) 704 return false; 705 706 CXXRecordDecl *BaseRD = GetClassForType(Base); 707 if (!BaseRD) 708 return false; 709 710 return DerivedRD->isDerivedFrom(BaseRD, Paths); 711} 712 713/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 714/// conversion (where Derived and Base are class types) is 715/// well-formed, meaning that the conversion is unambiguous (and 716/// that all of the base classes are accessible). Returns true 717/// and emits a diagnostic if the code is ill-formed, returns false 718/// otherwise. Loc is the location where this routine should point to 719/// if there is an error, and Range is the source range to highlight 720/// if there is an error. 721bool 722Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 723 unsigned InaccessibleBaseID, 724 unsigned AmbigiousBaseConvID, 725 SourceLocation Loc, SourceRange Range, 726 DeclarationName Name) { 727 // First, determine whether the path from Derived to Base is 728 // ambiguous. This is slightly more expensive than checking whether 729 // the Derived to Base conversion exists, because here we need to 730 // explore multiple paths to determine if there is an ambiguity. 731 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 732 /*DetectVirtual=*/false); 733 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 734 assert(DerivationOkay && 735 "Can only be used with a derived-to-base conversion"); 736 (void)DerivationOkay; 737 738 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 739 if (!InaccessibleBaseID) 740 return false; 741 742 // Check that the base class can be accessed. 743 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 744 InaccessibleBaseID)) { 745 case AR_accessible: return false; 746 case AR_inaccessible: return true; 747 case AR_dependent: return false; 748 case AR_delayed: return false; 749 } 750 } 751 752 // We know that the derived-to-base conversion is ambiguous, and 753 // we're going to produce a diagnostic. Perform the derived-to-base 754 // search just one more time to compute all of the possible paths so 755 // that we can print them out. This is more expensive than any of 756 // the previous derived-to-base checks we've done, but at this point 757 // performance isn't as much of an issue. 758 Paths.clear(); 759 Paths.setRecordingPaths(true); 760 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 761 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 762 (void)StillOkay; 763 764 // Build up a textual representation of the ambiguous paths, e.g., 765 // D -> B -> A, that will be used to illustrate the ambiguous 766 // conversions in the diagnostic. We only print one of the paths 767 // to each base class subobject. 768 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 769 770 Diag(Loc, AmbigiousBaseConvID) 771 << Derived << Base << PathDisplayStr << Range << Name; 772 return true; 773} 774 775bool 776Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 777 SourceLocation Loc, SourceRange Range, 778 bool IgnoreAccess) { 779 return CheckDerivedToBaseConversion(Derived, Base, 780 IgnoreAccess ? 0 781 : diag::err_upcast_to_inaccessible_base, 782 diag::err_ambiguous_derived_to_base_conv, 783 Loc, Range, DeclarationName()); 784} 785 786 787/// @brief Builds a string representing ambiguous paths from a 788/// specific derived class to different subobjects of the same base 789/// class. 790/// 791/// This function builds a string that can be used in error messages 792/// to show the different paths that one can take through the 793/// inheritance hierarchy to go from the derived class to different 794/// subobjects of a base class. The result looks something like this: 795/// @code 796/// struct D -> struct B -> struct A 797/// struct D -> struct C -> struct A 798/// @endcode 799std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 800 std::string PathDisplayStr; 801 std::set<unsigned> DisplayedPaths; 802 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 803 Path != Paths.end(); ++Path) { 804 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 805 // We haven't displayed a path to this particular base 806 // class subobject yet. 807 PathDisplayStr += "\n "; 808 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 809 for (CXXBasePath::const_iterator Element = Path->begin(); 810 Element != Path->end(); ++Element) 811 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 812 } 813 } 814 815 return PathDisplayStr; 816} 817 818//===----------------------------------------------------------------------===// 819// C++ class member Handling 820//===----------------------------------------------------------------------===// 821 822/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 823/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 824/// bitfield width if there is one and 'InitExpr' specifies the initializer if 825/// any. 826Sema::DeclPtrTy 827Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 828 MultiTemplateParamsArg TemplateParameterLists, 829 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 830 bool Deleted) { 831 const DeclSpec &DS = D.getDeclSpec(); 832 DeclarationName Name = GetNameForDeclarator(D); 833 Expr *BitWidth = static_cast<Expr*>(BW); 834 Expr *Init = static_cast<Expr*>(InitExpr); 835 SourceLocation Loc = D.getIdentifierLoc(); 836 837 bool isFunc = D.isFunctionDeclarator(); 838 839 assert(!DS.isFriendSpecified()); 840 841 // C++ 9.2p6: A member shall not be declared to have automatic storage 842 // duration (auto, register) or with the extern storage-class-specifier. 843 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 844 // data members and cannot be applied to names declared const or static, 845 // and cannot be applied to reference members. 846 switch (DS.getStorageClassSpec()) { 847 case DeclSpec::SCS_unspecified: 848 case DeclSpec::SCS_typedef: 849 case DeclSpec::SCS_static: 850 // FALL THROUGH. 851 break; 852 case DeclSpec::SCS_mutable: 853 if (isFunc) { 854 if (DS.getStorageClassSpecLoc().isValid()) 855 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 856 else 857 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 858 859 // FIXME: It would be nicer if the keyword was ignored only for this 860 // declarator. Otherwise we could get follow-up errors. 861 D.getMutableDeclSpec().ClearStorageClassSpecs(); 862 } else { 863 QualType T = GetTypeForDeclarator(D, S); 864 diag::kind err = static_cast<diag::kind>(0); 865 if (T->isReferenceType()) 866 err = diag::err_mutable_reference; 867 else if (T.isConstQualified()) 868 err = diag::err_mutable_const; 869 if (err != 0) { 870 if (DS.getStorageClassSpecLoc().isValid()) 871 Diag(DS.getStorageClassSpecLoc(), err); 872 else 873 Diag(DS.getThreadSpecLoc(), err); 874 // FIXME: It would be nicer if the keyword was ignored only for this 875 // declarator. Otherwise we could get follow-up errors. 876 D.getMutableDeclSpec().ClearStorageClassSpecs(); 877 } 878 } 879 break; 880 default: 881 if (DS.getStorageClassSpecLoc().isValid()) 882 Diag(DS.getStorageClassSpecLoc(), 883 diag::err_storageclass_invalid_for_member); 884 else 885 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 886 D.getMutableDeclSpec().ClearStorageClassSpecs(); 887 } 888 889 if (!isFunc && 890 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 891 D.getNumTypeObjects() == 0) { 892 // Check also for this case: 893 // 894 // typedef int f(); 895 // f a; 896 // 897 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 898 isFunc = TDType->isFunctionType(); 899 } 900 901 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 902 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 903 !isFunc); 904 905 Decl *Member; 906 if (isInstField) { 907 // FIXME: Check for template parameters! 908 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 909 AS); 910 assert(Member && "HandleField never returns null"); 911 } else { 912 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 913 .getAs<Decl>(); 914 if (!Member) { 915 if (BitWidth) DeleteExpr(BitWidth); 916 return DeclPtrTy(); 917 } 918 919 // Non-instance-fields can't have a bitfield. 920 if (BitWidth) { 921 if (Member->isInvalidDecl()) { 922 // don't emit another diagnostic. 923 } else if (isa<VarDecl>(Member)) { 924 // C++ 9.6p3: A bit-field shall not be a static member. 925 // "static member 'A' cannot be a bit-field" 926 Diag(Loc, diag::err_static_not_bitfield) 927 << Name << BitWidth->getSourceRange(); 928 } else if (isa<TypedefDecl>(Member)) { 929 // "typedef member 'x' cannot be a bit-field" 930 Diag(Loc, diag::err_typedef_not_bitfield) 931 << Name << BitWidth->getSourceRange(); 932 } else { 933 // A function typedef ("typedef int f(); f a;"). 934 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 935 Diag(Loc, diag::err_not_integral_type_bitfield) 936 << Name << cast<ValueDecl>(Member)->getType() 937 << BitWidth->getSourceRange(); 938 } 939 940 DeleteExpr(BitWidth); 941 BitWidth = 0; 942 Member->setInvalidDecl(); 943 } 944 945 Member->setAccess(AS); 946 947 // If we have declared a member function template, set the access of the 948 // templated declaration as well. 949 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 950 FunTmpl->getTemplatedDecl()->setAccess(AS); 951 } 952 953 assert((Name || isInstField) && "No identifier for non-field ?"); 954 955 if (Init) 956 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 957 if (Deleted) // FIXME: Source location is not very good. 958 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 959 960 if (isInstField) { 961 FieldCollector->Add(cast<FieldDecl>(Member)); 962 return DeclPtrTy(); 963 } 964 return DeclPtrTy::make(Member); 965} 966 967/// \brief Find the direct and/or virtual base specifiers that 968/// correspond to the given base type, for use in base initialization 969/// within a constructor. 970static bool FindBaseInitializer(Sema &SemaRef, 971 CXXRecordDecl *ClassDecl, 972 QualType BaseType, 973 const CXXBaseSpecifier *&DirectBaseSpec, 974 const CXXBaseSpecifier *&VirtualBaseSpec) { 975 // First, check for a direct base class. 976 DirectBaseSpec = 0; 977 for (CXXRecordDecl::base_class_const_iterator Base 978 = ClassDecl->bases_begin(); 979 Base != ClassDecl->bases_end(); ++Base) { 980 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 981 // We found a direct base of this type. That's what we're 982 // initializing. 983 DirectBaseSpec = &*Base; 984 break; 985 } 986 } 987 988 // Check for a virtual base class. 989 // FIXME: We might be able to short-circuit this if we know in advance that 990 // there are no virtual bases. 991 VirtualBaseSpec = 0; 992 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 993 // We haven't found a base yet; search the class hierarchy for a 994 // virtual base class. 995 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 996 /*DetectVirtual=*/false); 997 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 998 BaseType, Paths)) { 999 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1000 Path != Paths.end(); ++Path) { 1001 if (Path->back().Base->isVirtual()) { 1002 VirtualBaseSpec = Path->back().Base; 1003 break; 1004 } 1005 } 1006 } 1007 } 1008 1009 return DirectBaseSpec || VirtualBaseSpec; 1010} 1011 1012/// ActOnMemInitializer - Handle a C++ member initializer. 1013Sema::MemInitResult 1014Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1015 Scope *S, 1016 CXXScopeSpec &SS, 1017 IdentifierInfo *MemberOrBase, 1018 TypeTy *TemplateTypeTy, 1019 SourceLocation IdLoc, 1020 SourceLocation LParenLoc, 1021 ExprTy **Args, unsigned NumArgs, 1022 SourceLocation *CommaLocs, 1023 SourceLocation RParenLoc) { 1024 if (!ConstructorD) 1025 return true; 1026 1027 AdjustDeclIfTemplate(ConstructorD); 1028 1029 CXXConstructorDecl *Constructor 1030 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1031 if (!Constructor) { 1032 // The user wrote a constructor initializer on a function that is 1033 // not a C++ constructor. Ignore the error for now, because we may 1034 // have more member initializers coming; we'll diagnose it just 1035 // once in ActOnMemInitializers. 1036 return true; 1037 } 1038 1039 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1040 1041 // C++ [class.base.init]p2: 1042 // Names in a mem-initializer-id are looked up in the scope of the 1043 // constructor’s class and, if not found in that scope, are looked 1044 // up in the scope containing the constructor’s 1045 // definition. [Note: if the constructor’s class contains a member 1046 // with the same name as a direct or virtual base class of the 1047 // class, a mem-initializer-id naming the member or base class and 1048 // composed of a single identifier refers to the class member. A 1049 // mem-initializer-id for the hidden base class may be specified 1050 // using a qualified name. ] 1051 if (!SS.getScopeRep() && !TemplateTypeTy) { 1052 // Look for a member, first. 1053 FieldDecl *Member = 0; 1054 DeclContext::lookup_result Result 1055 = ClassDecl->lookup(MemberOrBase); 1056 if (Result.first != Result.second) 1057 Member = dyn_cast<FieldDecl>(*Result.first); 1058 1059 // FIXME: Handle members of an anonymous union. 1060 1061 if (Member) 1062 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1063 LParenLoc, RParenLoc); 1064 } 1065 // It didn't name a member, so see if it names a class. 1066 QualType BaseType; 1067 TypeSourceInfo *TInfo = 0; 1068 1069 if (TemplateTypeTy) { 1070 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1071 } else { 1072 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1073 LookupParsedName(R, S, &SS); 1074 1075 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1076 if (!TyD) { 1077 if (R.isAmbiguous()) return true; 1078 1079 // We don't want access-control diagnostics here. 1080 R.suppressDiagnostics(); 1081 1082 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1083 bool NotUnknownSpecialization = false; 1084 DeclContext *DC = computeDeclContext(SS, false); 1085 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1086 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1087 1088 if (!NotUnknownSpecialization) { 1089 // When the scope specifier can refer to a member of an unknown 1090 // specialization, we take it as a type name. 1091 BaseType = CheckTypenameType((NestedNameSpecifier *)SS.getScopeRep(), 1092 *MemberOrBase, SS.getRange()); 1093 if (BaseType.isNull()) 1094 return true; 1095 1096 R.clear(); 1097 } 1098 } 1099 1100 // If no results were found, try to correct typos. 1101 if (R.empty() && BaseType.isNull() && 1102 CorrectTypo(R, S, &SS, ClassDecl) && R.isSingleResult()) { 1103 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1104 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1105 // We have found a non-static data member with a similar 1106 // name to what was typed; complain and initialize that 1107 // member. 1108 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1109 << MemberOrBase << true << R.getLookupName() 1110 << FixItHint::CreateReplacement(R.getNameLoc(), 1111 R.getLookupName().getAsString()); 1112 Diag(Member->getLocation(), diag::note_previous_decl) 1113 << Member->getDeclName(); 1114 1115 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1116 LParenLoc, RParenLoc); 1117 } 1118 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1119 const CXXBaseSpecifier *DirectBaseSpec; 1120 const CXXBaseSpecifier *VirtualBaseSpec; 1121 if (FindBaseInitializer(*this, ClassDecl, 1122 Context.getTypeDeclType(Type), 1123 DirectBaseSpec, VirtualBaseSpec)) { 1124 // We have found a direct or virtual base class with a 1125 // similar name to what was typed; complain and initialize 1126 // that base class. 1127 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1128 << MemberOrBase << false << R.getLookupName() 1129 << FixItHint::CreateReplacement(R.getNameLoc(), 1130 R.getLookupName().getAsString()); 1131 1132 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1133 : VirtualBaseSpec; 1134 Diag(BaseSpec->getSourceRange().getBegin(), 1135 diag::note_base_class_specified_here) 1136 << BaseSpec->getType() 1137 << BaseSpec->getSourceRange(); 1138 1139 TyD = Type; 1140 } 1141 } 1142 } 1143 1144 if (!TyD && BaseType.isNull()) { 1145 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1146 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1147 return true; 1148 } 1149 } 1150 1151 if (BaseType.isNull()) { 1152 BaseType = Context.getTypeDeclType(TyD); 1153 if (SS.isSet()) { 1154 NestedNameSpecifier *Qualifier = 1155 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1156 1157 // FIXME: preserve source range information 1158 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1159 } 1160 } 1161 } 1162 1163 if (!TInfo) 1164 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1165 1166 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1167 LParenLoc, RParenLoc, ClassDecl); 1168} 1169 1170/// Checks an initializer expression for use of uninitialized fields, such as 1171/// containing the field that is being initialized. Returns true if there is an 1172/// uninitialized field was used an updates the SourceLocation parameter; false 1173/// otherwise. 1174static bool InitExprContainsUninitializedFields(const Stmt* S, 1175 const FieldDecl* LhsField, 1176 SourceLocation* L) { 1177 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1178 if (ME) { 1179 const NamedDecl* RhsField = ME->getMemberDecl(); 1180 if (RhsField == LhsField) { 1181 // Initializing a field with itself. Throw a warning. 1182 // But wait; there are exceptions! 1183 // Exception #1: The field may not belong to this record. 1184 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1185 const Expr* base = ME->getBase(); 1186 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1187 // Even though the field matches, it does not belong to this record. 1188 return false; 1189 } 1190 // None of the exceptions triggered; return true to indicate an 1191 // uninitialized field was used. 1192 *L = ME->getMemberLoc(); 1193 return true; 1194 } 1195 } 1196 bool found = false; 1197 for (Stmt::const_child_iterator it = S->child_begin(); 1198 it != S->child_end() && found == false; 1199 ++it) { 1200 if (isa<CallExpr>(S)) { 1201 // Do not descend into function calls or constructors, as the use 1202 // of an uninitialized field may be valid. One would have to inspect 1203 // the contents of the function/ctor to determine if it is safe or not. 1204 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1205 // may be safe, depending on what the function/ctor does. 1206 continue; 1207 } 1208 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1209 } 1210 return found; 1211} 1212 1213Sema::MemInitResult 1214Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1215 unsigned NumArgs, SourceLocation IdLoc, 1216 SourceLocation LParenLoc, 1217 SourceLocation RParenLoc) { 1218 // Diagnose value-uses of fields to initialize themselves, e.g. 1219 // foo(foo) 1220 // where foo is not also a parameter to the constructor. 1221 // TODO: implement -Wuninitialized and fold this into that framework. 1222 for (unsigned i = 0; i < NumArgs; ++i) { 1223 SourceLocation L; 1224 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1225 // FIXME: Return true in the case when other fields are used before being 1226 // uninitialized. For example, let this field be the i'th field. When 1227 // initializing the i'th field, throw a warning if any of the >= i'th 1228 // fields are used, as they are not yet initialized. 1229 // Right now we are only handling the case where the i'th field uses 1230 // itself in its initializer. 1231 Diag(L, diag::warn_field_is_uninit); 1232 } 1233 } 1234 1235 bool HasDependentArg = false; 1236 for (unsigned i = 0; i < NumArgs; i++) 1237 HasDependentArg |= Args[i]->isTypeDependent(); 1238 1239 QualType FieldType = Member->getType(); 1240 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1241 FieldType = Array->getElementType(); 1242 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1243 if (FieldType->isDependentType() || HasDependentArg) { 1244 // Can't check initialization for a member of dependent type or when 1245 // any of the arguments are type-dependent expressions. 1246 OwningExprResult Init 1247 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1248 RParenLoc)); 1249 1250 // Erase any temporaries within this evaluation context; we're not 1251 // going to track them in the AST, since we'll be rebuilding the 1252 // ASTs during template instantiation. 1253 ExprTemporaries.erase( 1254 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1255 ExprTemporaries.end()); 1256 1257 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1258 LParenLoc, 1259 Init.takeAs<Expr>(), 1260 RParenLoc); 1261 1262 } 1263 1264 if (Member->isInvalidDecl()) 1265 return true; 1266 1267 // Initialize the member. 1268 InitializedEntity MemberEntity = 1269 InitializedEntity::InitializeMember(Member, 0); 1270 InitializationKind Kind = 1271 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1272 1273 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1274 1275 OwningExprResult MemberInit = 1276 InitSeq.Perform(*this, MemberEntity, Kind, 1277 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1278 if (MemberInit.isInvalid()) 1279 return true; 1280 1281 // C++0x [class.base.init]p7: 1282 // The initialization of each base and member constitutes a 1283 // full-expression. 1284 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1285 if (MemberInit.isInvalid()) 1286 return true; 1287 1288 // If we are in a dependent context, template instantiation will 1289 // perform this type-checking again. Just save the arguments that we 1290 // received in a ParenListExpr. 1291 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1292 // of the information that we have about the member 1293 // initializer. However, deconstructing the ASTs is a dicey process, 1294 // and this approach is far more likely to get the corner cases right. 1295 if (CurContext->isDependentContext()) { 1296 // Bump the reference count of all of the arguments. 1297 for (unsigned I = 0; I != NumArgs; ++I) 1298 Args[I]->Retain(); 1299 1300 OwningExprResult Init 1301 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1302 RParenLoc)); 1303 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1304 LParenLoc, 1305 Init.takeAs<Expr>(), 1306 RParenLoc); 1307 } 1308 1309 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1310 LParenLoc, 1311 MemberInit.takeAs<Expr>(), 1312 RParenLoc); 1313} 1314 1315Sema::MemInitResult 1316Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1317 Expr **Args, unsigned NumArgs, 1318 SourceLocation LParenLoc, SourceLocation RParenLoc, 1319 CXXRecordDecl *ClassDecl) { 1320 bool HasDependentArg = false; 1321 for (unsigned i = 0; i < NumArgs; i++) 1322 HasDependentArg |= Args[i]->isTypeDependent(); 1323 1324 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1325 if (BaseType->isDependentType() || HasDependentArg) { 1326 // Can't check initialization for a base of dependent type or when 1327 // any of the arguments are type-dependent expressions. 1328 OwningExprResult BaseInit 1329 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1330 RParenLoc)); 1331 1332 // Erase any temporaries within this evaluation context; we're not 1333 // going to track them in the AST, since we'll be rebuilding the 1334 // ASTs during template instantiation. 1335 ExprTemporaries.erase( 1336 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1337 ExprTemporaries.end()); 1338 1339 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1340 /*IsVirtual=*/false, 1341 LParenLoc, 1342 BaseInit.takeAs<Expr>(), 1343 RParenLoc); 1344 } 1345 1346 if (!BaseType->isRecordType()) 1347 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1348 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1349 1350 // C++ [class.base.init]p2: 1351 // [...] Unless the mem-initializer-id names a nonstatic data 1352 // member of the constructor’s class or a direct or virtual base 1353 // of that class, the mem-initializer is ill-formed. A 1354 // mem-initializer-list can initialize a base class using any 1355 // name that denotes that base class type. 1356 1357 // Check for direct and virtual base classes. 1358 const CXXBaseSpecifier *DirectBaseSpec = 0; 1359 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1360 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1361 VirtualBaseSpec); 1362 1363 // C++ [base.class.init]p2: 1364 // If a mem-initializer-id is ambiguous because it designates both 1365 // a direct non-virtual base class and an inherited virtual base 1366 // class, the mem-initializer is ill-formed. 1367 if (DirectBaseSpec && VirtualBaseSpec) 1368 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1369 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1370 // C++ [base.class.init]p2: 1371 // Unless the mem-initializer-id names a nonstatic data membeer of the 1372 // constructor's class ot a direst or virtual base of that class, the 1373 // mem-initializer is ill-formed. 1374 if (!DirectBaseSpec && !VirtualBaseSpec) 1375 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1376 << BaseType << ClassDecl->getNameAsCString() 1377 << BaseTInfo->getTypeLoc().getSourceRange(); 1378 1379 CXXBaseSpecifier *BaseSpec 1380 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1381 if (!BaseSpec) 1382 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1383 1384 // Initialize the base. 1385 InitializedEntity BaseEntity = 1386 InitializedEntity::InitializeBase(Context, BaseSpec); 1387 InitializationKind Kind = 1388 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1389 1390 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1391 1392 OwningExprResult BaseInit = 1393 InitSeq.Perform(*this, BaseEntity, Kind, 1394 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1395 if (BaseInit.isInvalid()) 1396 return true; 1397 1398 // C++0x [class.base.init]p7: 1399 // The initialization of each base and member constitutes a 1400 // full-expression. 1401 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1402 if (BaseInit.isInvalid()) 1403 return true; 1404 1405 // If we are in a dependent context, template instantiation will 1406 // perform this type-checking again. Just save the arguments that we 1407 // received in a ParenListExpr. 1408 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1409 // of the information that we have about the base 1410 // initializer. However, deconstructing the ASTs is a dicey process, 1411 // and this approach is far more likely to get the corner cases right. 1412 if (CurContext->isDependentContext()) { 1413 // Bump the reference count of all of the arguments. 1414 for (unsigned I = 0; I != NumArgs; ++I) 1415 Args[I]->Retain(); 1416 1417 OwningExprResult Init 1418 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1419 RParenLoc)); 1420 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1421 BaseSpec->isVirtual(), 1422 LParenLoc, 1423 Init.takeAs<Expr>(), 1424 RParenLoc); 1425 } 1426 1427 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1428 BaseSpec->isVirtual(), 1429 LParenLoc, 1430 BaseInit.takeAs<Expr>(), 1431 RParenLoc); 1432} 1433 1434bool 1435Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1436 CXXBaseOrMemberInitializer **Initializers, 1437 unsigned NumInitializers, 1438 bool AnyErrors) { 1439 if (Constructor->getDeclContext()->isDependentContext()) { 1440 // Just store the initializers as written, they will be checked during 1441 // instantiation. 1442 if (NumInitializers > 0) { 1443 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1444 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1445 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1446 memcpy(baseOrMemberInitializers, Initializers, 1447 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1448 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1449 } 1450 1451 return false; 1452 } 1453 1454 // We need to build the initializer AST according to order of construction 1455 // and not what user specified in the Initializers list. 1456 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1457 if (!ClassDecl) 1458 return true; 1459 1460 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1461 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1462 bool HadError = false; 1463 1464 for (unsigned i = 0; i < NumInitializers; i++) { 1465 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1466 1467 if (Member->isBaseInitializer()) 1468 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1469 else 1470 AllBaseFields[Member->getMember()] = Member; 1471 } 1472 1473 llvm::SmallVector<CXXBaseSpecifier *, 4> BasesToDefaultInit; 1474 1475 // Push virtual bases before others. 1476 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1477 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1478 1479 if (CXXBaseOrMemberInitializer *Value 1480 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1481 AllToInit.push_back(Value); 1482 } else if (!AnyErrors) { 1483 InitializedEntity InitEntity 1484 = InitializedEntity::InitializeBase(Context, VBase); 1485 InitializationKind InitKind 1486 = InitializationKind::CreateDefault(Constructor->getLocation()); 1487 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1488 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1489 MultiExprArg(*this, 0, 0)); 1490 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1491 if (BaseInit.isInvalid()) { 1492 HadError = true; 1493 continue; 1494 } 1495 1496 CXXBaseOrMemberInitializer *CXXBaseInit = 1497 new (Context) CXXBaseOrMemberInitializer(Context, 1498 Context.getTrivialTypeSourceInfo(VBase->getType(), 1499 SourceLocation()), 1500 /*IsVirtual=*/true, 1501 SourceLocation(), 1502 BaseInit.takeAs<Expr>(), 1503 SourceLocation()); 1504 AllToInit.push_back(CXXBaseInit); 1505 } 1506 } 1507 1508 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1509 E = ClassDecl->bases_end(); Base != E; ++Base) { 1510 // Virtuals are in the virtual base list and already constructed. 1511 if (Base->isVirtual()) 1512 continue; 1513 1514 if (CXXBaseOrMemberInitializer *Value 1515 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1516 AllToInit.push_back(Value); 1517 } else if (!AnyErrors) { 1518 InitializedEntity InitEntity 1519 = InitializedEntity::InitializeBase(Context, Base); 1520 InitializationKind InitKind 1521 = InitializationKind::CreateDefault(Constructor->getLocation()); 1522 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1523 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1524 MultiExprArg(*this, 0, 0)); 1525 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1526 if (BaseInit.isInvalid()) { 1527 HadError = true; 1528 continue; 1529 } 1530 1531 CXXBaseOrMemberInitializer *CXXBaseInit = 1532 new (Context) CXXBaseOrMemberInitializer(Context, 1533 Context.getTrivialTypeSourceInfo(Base->getType(), 1534 SourceLocation()), 1535 /*IsVirtual=*/false, 1536 SourceLocation(), 1537 BaseInit.takeAs<Expr>(), 1538 SourceLocation()); 1539 AllToInit.push_back(CXXBaseInit); 1540 } 1541 } 1542 1543 // non-static data members. 1544 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1545 E = ClassDecl->field_end(); Field != E; ++Field) { 1546 if ((*Field)->isAnonymousStructOrUnion()) { 1547 if (const RecordType *FieldClassType = 1548 Field->getType()->getAs<RecordType>()) { 1549 CXXRecordDecl *FieldClassDecl 1550 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1551 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1552 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1553 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1554 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1555 // set to the anonymous union data member used in the initializer 1556 // list. 1557 Value->setMember(*Field); 1558 Value->setAnonUnionMember(*FA); 1559 AllToInit.push_back(Value); 1560 break; 1561 } 1562 } 1563 } 1564 continue; 1565 } 1566 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1567 AllToInit.push_back(Value); 1568 continue; 1569 } 1570 1571 if ((*Field)->getType()->isDependentType() || AnyErrors) 1572 continue; 1573 1574 QualType FT = Context.getBaseElementType((*Field)->getType()); 1575 if (FT->getAs<RecordType>()) { 1576 InitializedEntity InitEntity 1577 = InitializedEntity::InitializeMember(*Field); 1578 InitializationKind InitKind 1579 = InitializationKind::CreateDefault(Constructor->getLocation()); 1580 1581 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1582 OwningExprResult MemberInit = InitSeq.Perform(*this, InitEntity, InitKind, 1583 MultiExprArg(*this, 0, 0)); 1584 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1585 if (MemberInit.isInvalid()) { 1586 HadError = true; 1587 continue; 1588 } 1589 1590 // Don't attach synthesized member initializers in a dependent 1591 // context; they'll be regenerated a template instantiation 1592 // time. 1593 if (CurContext->isDependentContext()) 1594 continue; 1595 1596 CXXBaseOrMemberInitializer *Member = 1597 new (Context) CXXBaseOrMemberInitializer(Context, 1598 *Field, SourceLocation(), 1599 SourceLocation(), 1600 MemberInit.takeAs<Expr>(), 1601 SourceLocation()); 1602 1603 AllToInit.push_back(Member); 1604 } 1605 else if (FT->isReferenceType()) { 1606 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1607 << (int)Constructor->isImplicit() << Context.getTagDeclType(ClassDecl) 1608 << 0 << (*Field)->getDeclName(); 1609 Diag((*Field)->getLocation(), diag::note_declared_at); 1610 HadError = true; 1611 } 1612 else if (FT.isConstQualified()) { 1613 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1614 << (int)Constructor->isImplicit() << Context.getTagDeclType(ClassDecl) 1615 << 1 << (*Field)->getDeclName(); 1616 Diag((*Field)->getLocation(), diag::note_declared_at); 1617 HadError = true; 1618 } 1619 } 1620 1621 NumInitializers = AllToInit.size(); 1622 if (NumInitializers > 0) { 1623 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1624 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1625 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1626 memcpy(baseOrMemberInitializers, AllToInit.data(), 1627 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1628 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1629 1630 // Constructors implicitly reference the base and member 1631 // destructors. 1632 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1633 Constructor->getParent()); 1634 } 1635 1636 return HadError; 1637} 1638 1639static void *GetKeyForTopLevelField(FieldDecl *Field) { 1640 // For anonymous unions, use the class declaration as the key. 1641 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1642 if (RT->getDecl()->isAnonymousStructOrUnion()) 1643 return static_cast<void *>(RT->getDecl()); 1644 } 1645 return static_cast<void *>(Field); 1646} 1647 1648static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1649 return Context.getCanonicalType(BaseType).getTypePtr(); 1650} 1651 1652static void *GetKeyForMember(ASTContext &Context, 1653 CXXBaseOrMemberInitializer *Member, 1654 bool MemberMaybeAnon = false) { 1655 if (!Member->isMemberInitializer()) 1656 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1657 1658 // For fields injected into the class via declaration of an anonymous union, 1659 // use its anonymous union class declaration as the unique key. 1660 FieldDecl *Field = Member->getMember(); 1661 1662 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1663 // data member of the class. Data member used in the initializer list is 1664 // in AnonUnionMember field. 1665 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1666 Field = Member->getAnonUnionMember(); 1667 1668 // If the field is a member of an anonymous struct or union, our key 1669 // is the anonymous record decl that's a direct child of the class. 1670 RecordDecl *RD = Field->getParent(); 1671 if (RD->isAnonymousStructOrUnion()) { 1672 while (true) { 1673 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1674 if (Parent->isAnonymousStructOrUnion()) 1675 RD = Parent; 1676 else 1677 break; 1678 } 1679 1680 return static_cast<void *>(RD); 1681 } 1682 1683 return static_cast<void *>(Field); 1684} 1685 1686static void 1687DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1688 const CXXConstructorDecl *Constructor, 1689 CXXBaseOrMemberInitializer **Inits, 1690 unsigned NumInits) { 1691 if (Constructor->getDeclContext()->isDependentContext()) 1692 return; 1693 1694 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1695 == Diagnostic::Ignored) 1696 return; 1697 1698 // Build the list of bases and members in the order that they'll 1699 // actually be initialized. The explicit initializers should be in 1700 // this same order but may be missing things. 1701 llvm::SmallVector<const void*, 32> IdealInitKeys; 1702 1703 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1704 1705 // 1. Virtual bases. 1706 for (CXXRecordDecl::base_class_const_iterator VBase = 1707 ClassDecl->vbases_begin(), 1708 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1709 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 1710 1711 // 2. Non-virtual bases. 1712 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1713 E = ClassDecl->bases_end(); Base != E; ++Base) { 1714 if (Base->isVirtual()) 1715 continue; 1716 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 1717 } 1718 1719 // 3. Direct fields. 1720 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1721 E = ClassDecl->field_end(); Field != E; ++Field) 1722 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 1723 1724 unsigned NumIdealInits = IdealInitKeys.size(); 1725 unsigned IdealIndex = 0; 1726 1727 CXXBaseOrMemberInitializer *PrevInit = 0; 1728 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 1729 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 1730 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 1731 1732 // Scan forward to try to find this initializer in the idealized 1733 // initializers list. 1734 for (; IdealIndex != NumIdealInits; ++IdealIndex) 1735 if (InitKey == IdealInitKeys[IdealIndex]) 1736 break; 1737 1738 // If we didn't find this initializer, it must be because we 1739 // scanned past it on a previous iteration. That can only 1740 // happen if we're out of order; emit a warning. 1741 if (IdealIndex == NumIdealInits) { 1742 assert(PrevInit && "initializer not found in initializer list"); 1743 1744 Sema::SemaDiagnosticBuilder D = 1745 SemaRef.Diag(PrevInit->getSourceLocation(), 1746 diag::warn_initializer_out_of_order); 1747 1748 if (PrevInit->isMemberInitializer()) 1749 D << 0 << PrevInit->getMember()->getDeclName(); 1750 else 1751 D << 1 << PrevInit->getBaseClassInfo()->getType(); 1752 1753 if (Init->isMemberInitializer()) 1754 D << 0 << Init->getMember()->getDeclName(); 1755 else 1756 D << 1 << Init->getBaseClassInfo()->getType(); 1757 1758 // Move back to the initializer's location in the ideal list. 1759 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 1760 if (InitKey == IdealInitKeys[IdealIndex]) 1761 break; 1762 1763 assert(IdealIndex != NumIdealInits && 1764 "initializer not found in initializer list"); 1765 } 1766 1767 PrevInit = Init; 1768 } 1769} 1770 1771namespace { 1772bool CheckRedundantInit(Sema &S, 1773 CXXBaseOrMemberInitializer *Init, 1774 CXXBaseOrMemberInitializer *&PrevInit) { 1775 if (!PrevInit) { 1776 PrevInit = Init; 1777 return false; 1778 } 1779 1780 if (FieldDecl *Field = Init->getMember()) 1781 S.Diag(Init->getSourceLocation(), 1782 diag::err_multiple_mem_initialization) 1783 << Field->getDeclName() 1784 << Init->getSourceRange(); 1785 else { 1786 Type *BaseClass = Init->getBaseClass(); 1787 assert(BaseClass && "neither field nor base"); 1788 S.Diag(Init->getSourceLocation(), 1789 diag::err_multiple_base_initialization) 1790 << QualType(BaseClass, 0) 1791 << Init->getSourceRange(); 1792 } 1793 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 1794 << 0 << PrevInit->getSourceRange(); 1795 1796 return true; 1797} 1798 1799typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 1800typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 1801 1802bool CheckRedundantUnionInit(Sema &S, 1803 CXXBaseOrMemberInitializer *Init, 1804 RedundantUnionMap &Unions) { 1805 FieldDecl *Field = Init->getMember(); 1806 RecordDecl *Parent = Field->getParent(); 1807 if (!Parent->isAnonymousStructOrUnion()) 1808 return false; 1809 1810 NamedDecl *Child = Field; 1811 do { 1812 if (Parent->isUnion()) { 1813 UnionEntry &En = Unions[Parent]; 1814 if (En.first && En.first != Child) { 1815 S.Diag(Init->getSourceLocation(), 1816 diag::err_multiple_mem_union_initialization) 1817 << Field->getDeclName() 1818 << Init->getSourceRange(); 1819 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 1820 << 0 << En.second->getSourceRange(); 1821 return true; 1822 } else if (!En.first) { 1823 En.first = Child; 1824 En.second = Init; 1825 } 1826 } 1827 1828 Child = Parent; 1829 Parent = cast<RecordDecl>(Parent->getDeclContext()); 1830 } while (Parent->isAnonymousStructOrUnion()); 1831 1832 return false; 1833} 1834} 1835 1836/// ActOnMemInitializers - Handle the member initializers for a constructor. 1837void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1838 SourceLocation ColonLoc, 1839 MemInitTy **meminits, unsigned NumMemInits, 1840 bool AnyErrors) { 1841 if (!ConstructorDecl) 1842 return; 1843 1844 AdjustDeclIfTemplate(ConstructorDecl); 1845 1846 CXXConstructorDecl *Constructor 1847 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1848 1849 if (!Constructor) { 1850 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1851 return; 1852 } 1853 1854 CXXBaseOrMemberInitializer **MemInits = 1855 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 1856 1857 // Mapping for the duplicate initializers check. 1858 // For member initializers, this is keyed with a FieldDecl*. 1859 // For base initializers, this is keyed with a Type*. 1860 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 1861 1862 // Mapping for the inconsistent anonymous-union initializers check. 1863 RedundantUnionMap MemberUnions; 1864 1865 bool HadError = false; 1866 for (unsigned i = 0; i < NumMemInits; i++) { 1867 CXXBaseOrMemberInitializer *Init = MemInits[i]; 1868 1869 if (Init->isMemberInitializer()) { 1870 FieldDecl *Field = Init->getMember(); 1871 if (CheckRedundantInit(*this, Init, Members[Field]) || 1872 CheckRedundantUnionInit(*this, Init, MemberUnions)) 1873 HadError = true; 1874 } else { 1875 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 1876 if (CheckRedundantInit(*this, Init, Members[Key])) 1877 HadError = true; 1878 } 1879 } 1880 1881 if (HadError) 1882 return; 1883 1884 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 1885 1886 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 1887} 1888 1889void 1890Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 1891 CXXRecordDecl *ClassDecl) { 1892 // Ignore dependent contexts. 1893 if (ClassDecl->isDependentContext()) 1894 return; 1895 1896 // FIXME: all the access-control diagnostics are positioned on the 1897 // field/base declaration. That's probably good; that said, the 1898 // user might reasonably want to know why the destructor is being 1899 // emitted, and we currently don't say. 1900 1901 // Non-static data members. 1902 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1903 E = ClassDecl->field_end(); I != E; ++I) { 1904 FieldDecl *Field = *I; 1905 1906 QualType FieldType = Context.getBaseElementType(Field->getType()); 1907 1908 const RecordType* RT = FieldType->getAs<RecordType>(); 1909 if (!RT) 1910 continue; 1911 1912 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1913 if (FieldClassDecl->hasTrivialDestructor()) 1914 continue; 1915 1916 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1917 CheckDestructorAccess(Field->getLocation(), Dtor, 1918 PDiag(diag::err_access_dtor_field) 1919 << Field->getDeclName() 1920 << FieldType); 1921 1922 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1923 } 1924 1925 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 1926 1927 // Bases. 1928 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1929 E = ClassDecl->bases_end(); Base != E; ++Base) { 1930 // Bases are always records in a well-formed non-dependent class. 1931 const RecordType *RT = Base->getType()->getAs<RecordType>(); 1932 1933 // Remember direct virtual bases. 1934 if (Base->isVirtual()) 1935 DirectVirtualBases.insert(RT); 1936 1937 // Ignore trivial destructors. 1938 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1939 if (BaseClassDecl->hasTrivialDestructor()) 1940 continue; 1941 1942 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1943 1944 // FIXME: caret should be on the start of the class name 1945 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 1946 PDiag(diag::err_access_dtor_base) 1947 << Base->getType() 1948 << Base->getSourceRange()); 1949 1950 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1951 } 1952 1953 // Virtual bases. 1954 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1955 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1956 1957 // Bases are always records in a well-formed non-dependent class. 1958 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 1959 1960 // Ignore direct virtual bases. 1961 if (DirectVirtualBases.count(RT)) 1962 continue; 1963 1964 // Ignore trivial destructors. 1965 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1966 if (BaseClassDecl->hasTrivialDestructor()) 1967 continue; 1968 1969 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1970 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 1971 PDiag(diag::err_access_dtor_vbase) 1972 << VBase->getType()); 1973 1974 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1975 } 1976} 1977 1978void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1979 if (!CDtorDecl) 1980 return; 1981 1982 if (CXXConstructorDecl *Constructor 1983 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1984 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 1985} 1986 1987bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1988 unsigned DiagID, AbstractDiagSelID SelID, 1989 const CXXRecordDecl *CurrentRD) { 1990 if (SelID == -1) 1991 return RequireNonAbstractType(Loc, T, 1992 PDiag(DiagID), CurrentRD); 1993 else 1994 return RequireNonAbstractType(Loc, T, 1995 PDiag(DiagID) << SelID, CurrentRD); 1996} 1997 1998bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1999 const PartialDiagnostic &PD, 2000 const CXXRecordDecl *CurrentRD) { 2001 if (!getLangOptions().CPlusPlus) 2002 return false; 2003 2004 if (const ArrayType *AT = Context.getAsArrayType(T)) 2005 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2006 CurrentRD); 2007 2008 if (const PointerType *PT = T->getAs<PointerType>()) { 2009 // Find the innermost pointer type. 2010 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2011 PT = T; 2012 2013 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2014 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2015 } 2016 2017 const RecordType *RT = T->getAs<RecordType>(); 2018 if (!RT) 2019 return false; 2020 2021 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2022 2023 if (CurrentRD && CurrentRD != RD) 2024 return false; 2025 2026 // FIXME: is this reasonable? It matches current behavior, but.... 2027 if (!RD->getDefinition()) 2028 return false; 2029 2030 if (!RD->isAbstract()) 2031 return false; 2032 2033 Diag(Loc, PD) << RD->getDeclName(); 2034 2035 // Check if we've already emitted the list of pure virtual functions for this 2036 // class. 2037 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2038 return true; 2039 2040 CXXFinalOverriderMap FinalOverriders; 2041 RD->getFinalOverriders(FinalOverriders); 2042 2043 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2044 MEnd = FinalOverriders.end(); 2045 M != MEnd; 2046 ++M) { 2047 for (OverridingMethods::iterator SO = M->second.begin(), 2048 SOEnd = M->second.end(); 2049 SO != SOEnd; ++SO) { 2050 // C++ [class.abstract]p4: 2051 // A class is abstract if it contains or inherits at least one 2052 // pure virtual function for which the final overrider is pure 2053 // virtual. 2054 2055 // 2056 if (SO->second.size() != 1) 2057 continue; 2058 2059 if (!SO->second.front().Method->isPure()) 2060 continue; 2061 2062 Diag(SO->second.front().Method->getLocation(), 2063 diag::note_pure_virtual_function) 2064 << SO->second.front().Method->getDeclName(); 2065 } 2066 } 2067 2068 if (!PureVirtualClassDiagSet) 2069 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2070 PureVirtualClassDiagSet->insert(RD); 2071 2072 return true; 2073} 2074 2075namespace { 2076 class AbstractClassUsageDiagnoser 2077 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2078 Sema &SemaRef; 2079 CXXRecordDecl *AbstractClass; 2080 2081 bool VisitDeclContext(const DeclContext *DC) { 2082 bool Invalid = false; 2083 2084 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2085 E = DC->decls_end(); I != E; ++I) 2086 Invalid |= Visit(*I); 2087 2088 return Invalid; 2089 } 2090 2091 public: 2092 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2093 : SemaRef(SemaRef), AbstractClass(ac) { 2094 Visit(SemaRef.Context.getTranslationUnitDecl()); 2095 } 2096 2097 bool VisitFunctionDecl(const FunctionDecl *FD) { 2098 if (FD->isThisDeclarationADefinition()) { 2099 // No need to do the check if we're in a definition, because it requires 2100 // that the return/param types are complete. 2101 // because that requires 2102 return VisitDeclContext(FD); 2103 } 2104 2105 // Check the return type. 2106 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2107 bool Invalid = 2108 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2109 diag::err_abstract_type_in_decl, 2110 Sema::AbstractReturnType, 2111 AbstractClass); 2112 2113 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2114 E = FD->param_end(); I != E; ++I) { 2115 const ParmVarDecl *VD = *I; 2116 Invalid |= 2117 SemaRef.RequireNonAbstractType(VD->getLocation(), 2118 VD->getOriginalType(), 2119 diag::err_abstract_type_in_decl, 2120 Sema::AbstractParamType, 2121 AbstractClass); 2122 } 2123 2124 return Invalid; 2125 } 2126 2127 bool VisitDecl(const Decl* D) { 2128 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2129 return VisitDeclContext(DC); 2130 2131 return false; 2132 } 2133 }; 2134} 2135 2136/// \brief Perform semantic checks on a class definition that has been 2137/// completing, introducing implicitly-declared members, checking for 2138/// abstract types, etc. 2139void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2140 if (!Record || Record->isInvalidDecl()) 2141 return; 2142 2143 if (!Record->isDependentType()) 2144 AddImplicitlyDeclaredMembersToClass(Record); 2145 2146 if (Record->isInvalidDecl()) 2147 return; 2148 2149 // Set access bits correctly on the directly-declared conversions. 2150 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2151 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2152 Convs->setAccess(I, (*I)->getAccess()); 2153 2154 // Determine whether we need to check for final overriders. We do 2155 // this either when there are virtual base classes (in which case we 2156 // may end up finding multiple final overriders for a given virtual 2157 // function) or any of the base classes is abstract (in which case 2158 // we might detect that this class is abstract). 2159 bool CheckFinalOverriders = false; 2160 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2161 !Record->isDependentType()) { 2162 if (Record->getNumVBases()) 2163 CheckFinalOverriders = true; 2164 else if (!Record->isAbstract()) { 2165 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2166 BEnd = Record->bases_end(); 2167 B != BEnd; ++B) { 2168 CXXRecordDecl *BaseDecl 2169 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2170 if (BaseDecl->isAbstract()) { 2171 CheckFinalOverriders = true; 2172 break; 2173 } 2174 } 2175 } 2176 } 2177 2178 if (CheckFinalOverriders) { 2179 CXXFinalOverriderMap FinalOverriders; 2180 Record->getFinalOverriders(FinalOverriders); 2181 2182 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2183 MEnd = FinalOverriders.end(); 2184 M != MEnd; ++M) { 2185 for (OverridingMethods::iterator SO = M->second.begin(), 2186 SOEnd = M->second.end(); 2187 SO != SOEnd; ++SO) { 2188 assert(SO->second.size() > 0 && 2189 "All virtual functions have overridding virtual functions"); 2190 if (SO->second.size() == 1) { 2191 // C++ [class.abstract]p4: 2192 // A class is abstract if it contains or inherits at least one 2193 // pure virtual function for which the final overrider is pure 2194 // virtual. 2195 if (SO->second.front().Method->isPure()) 2196 Record->setAbstract(true); 2197 continue; 2198 } 2199 2200 // C++ [class.virtual]p2: 2201 // In a derived class, if a virtual member function of a base 2202 // class subobject has more than one final overrider the 2203 // program is ill-formed. 2204 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2205 << (NamedDecl *)M->first << Record; 2206 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2207 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2208 OMEnd = SO->second.end(); 2209 OM != OMEnd; ++OM) 2210 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2211 << (NamedDecl *)M->first << OM->Method->getParent(); 2212 2213 Record->setInvalidDecl(); 2214 } 2215 } 2216 } 2217 2218 if (Record->isAbstract() && !Record->isInvalidDecl()) 2219 (void)AbstractClassUsageDiagnoser(*this, Record); 2220} 2221 2222void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2223 DeclPtrTy TagDecl, 2224 SourceLocation LBrac, 2225 SourceLocation RBrac, 2226 AttributeList *AttrList) { 2227 if (!TagDecl) 2228 return; 2229 2230 AdjustDeclIfTemplate(TagDecl); 2231 2232 ActOnFields(S, RLoc, TagDecl, 2233 (DeclPtrTy*)FieldCollector->getCurFields(), 2234 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2235 2236 CheckCompletedCXXClass( 2237 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2238} 2239 2240/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2241/// special functions, such as the default constructor, copy 2242/// constructor, or destructor, to the given C++ class (C++ 2243/// [special]p1). This routine can only be executed just before the 2244/// definition of the class is complete. 2245void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2246 CanQualType ClassType 2247 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2248 2249 // FIXME: Implicit declarations have exception specifications, which are 2250 // the union of the specifications of the implicitly called functions. 2251 2252 if (!ClassDecl->hasUserDeclaredConstructor()) { 2253 // C++ [class.ctor]p5: 2254 // A default constructor for a class X is a constructor of class X 2255 // that can be called without an argument. If there is no 2256 // user-declared constructor for class X, a default constructor is 2257 // implicitly declared. An implicitly-declared default constructor 2258 // is an inline public member of its class. 2259 DeclarationName Name 2260 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2261 CXXConstructorDecl *DefaultCon = 2262 CXXConstructorDecl::Create(Context, ClassDecl, 2263 ClassDecl->getLocation(), Name, 2264 Context.getFunctionType(Context.VoidTy, 2265 0, 0, false, 0, 2266 /*FIXME*/false, false, 2267 0, 0, 2268 FunctionType::ExtInfo()), 2269 /*TInfo=*/0, 2270 /*isExplicit=*/false, 2271 /*isInline=*/true, 2272 /*isImplicitlyDeclared=*/true); 2273 DefaultCon->setAccess(AS_public); 2274 DefaultCon->setImplicit(); 2275 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2276 ClassDecl->addDecl(DefaultCon); 2277 } 2278 2279 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2280 // C++ [class.copy]p4: 2281 // If the class definition does not explicitly declare a copy 2282 // constructor, one is declared implicitly. 2283 2284 // C++ [class.copy]p5: 2285 // The implicitly-declared copy constructor for a class X will 2286 // have the form 2287 // 2288 // X::X(const X&) 2289 // 2290 // if 2291 bool HasConstCopyConstructor = true; 2292 2293 // -- each direct or virtual base class B of X has a copy 2294 // constructor whose first parameter is of type const B& or 2295 // const volatile B&, and 2296 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2297 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2298 const CXXRecordDecl *BaseClassDecl 2299 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2300 HasConstCopyConstructor 2301 = BaseClassDecl->hasConstCopyConstructor(Context); 2302 } 2303 2304 // -- for all the nonstatic data members of X that are of a 2305 // class type M (or array thereof), each such class type 2306 // has a copy constructor whose first parameter is of type 2307 // const M& or const volatile M&. 2308 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2309 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2310 ++Field) { 2311 QualType FieldType = (*Field)->getType(); 2312 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2313 FieldType = Array->getElementType(); 2314 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2315 const CXXRecordDecl *FieldClassDecl 2316 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2317 HasConstCopyConstructor 2318 = FieldClassDecl->hasConstCopyConstructor(Context); 2319 } 2320 } 2321 2322 // Otherwise, the implicitly declared copy constructor will have 2323 // the form 2324 // 2325 // X::X(X&) 2326 QualType ArgType = ClassType; 2327 if (HasConstCopyConstructor) 2328 ArgType = ArgType.withConst(); 2329 ArgType = Context.getLValueReferenceType(ArgType); 2330 2331 // An implicitly-declared copy constructor is an inline public 2332 // member of its class. 2333 DeclarationName Name 2334 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2335 CXXConstructorDecl *CopyConstructor 2336 = CXXConstructorDecl::Create(Context, ClassDecl, 2337 ClassDecl->getLocation(), Name, 2338 Context.getFunctionType(Context.VoidTy, 2339 &ArgType, 1, 2340 false, 0, 2341 /*FIXME:*/false, 2342 false, 0, 0, 2343 FunctionType::ExtInfo()), 2344 /*TInfo=*/0, 2345 /*isExplicit=*/false, 2346 /*isInline=*/true, 2347 /*isImplicitlyDeclared=*/true); 2348 CopyConstructor->setAccess(AS_public); 2349 CopyConstructor->setImplicit(); 2350 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2351 2352 // Add the parameter to the constructor. 2353 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2354 ClassDecl->getLocation(), 2355 /*IdentifierInfo=*/0, 2356 ArgType, /*TInfo=*/0, 2357 VarDecl::None, 0); 2358 CopyConstructor->setParams(&FromParam, 1); 2359 ClassDecl->addDecl(CopyConstructor); 2360 } 2361 2362 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2363 // Note: The following rules are largely analoguous to the copy 2364 // constructor rules. Note that virtual bases are not taken into account 2365 // for determining the argument type of the operator. Note also that 2366 // operators taking an object instead of a reference are allowed. 2367 // 2368 // C++ [class.copy]p10: 2369 // If the class definition does not explicitly declare a copy 2370 // assignment operator, one is declared implicitly. 2371 // The implicitly-defined copy assignment operator for a class X 2372 // will have the form 2373 // 2374 // X& X::operator=(const X&) 2375 // 2376 // if 2377 bool HasConstCopyAssignment = true; 2378 2379 // -- each direct base class B of X has a copy assignment operator 2380 // whose parameter is of type const B&, const volatile B& or B, 2381 // and 2382 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2383 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2384 assert(!Base->getType()->isDependentType() && 2385 "Cannot generate implicit members for class with dependent bases."); 2386 const CXXRecordDecl *BaseClassDecl 2387 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2388 const CXXMethodDecl *MD = 0; 2389 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2390 MD); 2391 } 2392 2393 // -- for all the nonstatic data members of X that are of a class 2394 // type M (or array thereof), each such class type has a copy 2395 // assignment operator whose parameter is of type const M&, 2396 // const volatile M& or M. 2397 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2398 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2399 ++Field) { 2400 QualType FieldType = (*Field)->getType(); 2401 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2402 FieldType = Array->getElementType(); 2403 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2404 const CXXRecordDecl *FieldClassDecl 2405 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2406 const CXXMethodDecl *MD = 0; 2407 HasConstCopyAssignment 2408 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2409 } 2410 } 2411 2412 // Otherwise, the implicitly declared copy assignment operator will 2413 // have the form 2414 // 2415 // X& X::operator=(X&) 2416 QualType ArgType = ClassType; 2417 QualType RetType = Context.getLValueReferenceType(ArgType); 2418 if (HasConstCopyAssignment) 2419 ArgType = ArgType.withConst(); 2420 ArgType = Context.getLValueReferenceType(ArgType); 2421 2422 // An implicitly-declared copy assignment operator is an inline public 2423 // member of its class. 2424 DeclarationName Name = 2425 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2426 CXXMethodDecl *CopyAssignment = 2427 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2428 Context.getFunctionType(RetType, &ArgType, 1, 2429 false, 0, 2430 /*FIXME:*/false, 2431 false, 0, 0, 2432 FunctionType::ExtInfo()), 2433 /*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2434 CopyAssignment->setAccess(AS_public); 2435 CopyAssignment->setImplicit(); 2436 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2437 CopyAssignment->setCopyAssignment(true); 2438 2439 // Add the parameter to the operator. 2440 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2441 ClassDecl->getLocation(), 2442 /*IdentifierInfo=*/0, 2443 ArgType, /*TInfo=*/0, 2444 VarDecl::None, 0); 2445 CopyAssignment->setParams(&FromParam, 1); 2446 2447 // Don't call addedAssignmentOperator. There is no way to distinguish an 2448 // implicit from an explicit assignment operator. 2449 ClassDecl->addDecl(CopyAssignment); 2450 AddOverriddenMethods(ClassDecl, CopyAssignment); 2451 } 2452 2453 if (!ClassDecl->hasUserDeclaredDestructor()) { 2454 // C++ [class.dtor]p2: 2455 // If a class has no user-declared destructor, a destructor is 2456 // declared implicitly. An implicitly-declared destructor is an 2457 // inline public member of its class. 2458 QualType Ty = Context.getFunctionType(Context.VoidTy, 2459 0, 0, false, 0, 2460 /*FIXME:*/false, 2461 false, 0, 0, FunctionType::ExtInfo()); 2462 2463 DeclarationName Name 2464 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2465 CXXDestructorDecl *Destructor 2466 = CXXDestructorDecl::Create(Context, ClassDecl, 2467 ClassDecl->getLocation(), Name, Ty, 2468 /*isInline=*/true, 2469 /*isImplicitlyDeclared=*/true); 2470 Destructor->setAccess(AS_public); 2471 Destructor->setImplicit(); 2472 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2473 ClassDecl->addDecl(Destructor); 2474 2475 // This could be uniqued if it ever proves significant. 2476 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2477 2478 AddOverriddenMethods(ClassDecl, Destructor); 2479 } 2480} 2481 2482void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2483 Decl *D = TemplateD.getAs<Decl>(); 2484 if (!D) 2485 return; 2486 2487 TemplateParameterList *Params = 0; 2488 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2489 Params = Template->getTemplateParameters(); 2490 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2491 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2492 Params = PartialSpec->getTemplateParameters(); 2493 else 2494 return; 2495 2496 for (TemplateParameterList::iterator Param = Params->begin(), 2497 ParamEnd = Params->end(); 2498 Param != ParamEnd; ++Param) { 2499 NamedDecl *Named = cast<NamedDecl>(*Param); 2500 if (Named->getDeclName()) { 2501 S->AddDecl(DeclPtrTy::make(Named)); 2502 IdResolver.AddDecl(Named); 2503 } 2504 } 2505} 2506 2507void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2508 if (!RecordD) return; 2509 AdjustDeclIfTemplate(RecordD); 2510 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2511 PushDeclContext(S, Record); 2512} 2513 2514void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2515 if (!RecordD) return; 2516 PopDeclContext(); 2517} 2518 2519/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2520/// parsing a top-level (non-nested) C++ class, and we are now 2521/// parsing those parts of the given Method declaration that could 2522/// not be parsed earlier (C++ [class.mem]p2), such as default 2523/// arguments. This action should enter the scope of the given 2524/// Method declaration as if we had just parsed the qualified method 2525/// name. However, it should not bring the parameters into scope; 2526/// that will be performed by ActOnDelayedCXXMethodParameter. 2527void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2528} 2529 2530/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2531/// C++ method declaration. We're (re-)introducing the given 2532/// function parameter into scope for use in parsing later parts of 2533/// the method declaration. For example, we could see an 2534/// ActOnParamDefaultArgument event for this parameter. 2535void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2536 if (!ParamD) 2537 return; 2538 2539 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2540 2541 // If this parameter has an unparsed default argument, clear it out 2542 // to make way for the parsed default argument. 2543 if (Param->hasUnparsedDefaultArg()) 2544 Param->setDefaultArg(0); 2545 2546 S->AddDecl(DeclPtrTy::make(Param)); 2547 if (Param->getDeclName()) 2548 IdResolver.AddDecl(Param); 2549} 2550 2551/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2552/// processing the delayed method declaration for Method. The method 2553/// declaration is now considered finished. There may be a separate 2554/// ActOnStartOfFunctionDef action later (not necessarily 2555/// immediately!) for this method, if it was also defined inside the 2556/// class body. 2557void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2558 if (!MethodD) 2559 return; 2560 2561 AdjustDeclIfTemplate(MethodD); 2562 2563 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2564 2565 // Now that we have our default arguments, check the constructor 2566 // again. It could produce additional diagnostics or affect whether 2567 // the class has implicitly-declared destructors, among other 2568 // things. 2569 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2570 CheckConstructor(Constructor); 2571 2572 // Check the default arguments, which we may have added. 2573 if (!Method->isInvalidDecl()) 2574 CheckCXXDefaultArguments(Method); 2575} 2576 2577/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2578/// the well-formedness of the constructor declarator @p D with type @p 2579/// R. If there are any errors in the declarator, this routine will 2580/// emit diagnostics and set the invalid bit to true. In any case, the type 2581/// will be updated to reflect a well-formed type for the constructor and 2582/// returned. 2583QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2584 FunctionDecl::StorageClass &SC) { 2585 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2586 2587 // C++ [class.ctor]p3: 2588 // A constructor shall not be virtual (10.3) or static (9.4). A 2589 // constructor can be invoked for a const, volatile or const 2590 // volatile object. A constructor shall not be declared const, 2591 // volatile, or const volatile (9.3.2). 2592 if (isVirtual) { 2593 if (!D.isInvalidType()) 2594 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2595 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2596 << SourceRange(D.getIdentifierLoc()); 2597 D.setInvalidType(); 2598 } 2599 if (SC == FunctionDecl::Static) { 2600 if (!D.isInvalidType()) 2601 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2602 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2603 << SourceRange(D.getIdentifierLoc()); 2604 D.setInvalidType(); 2605 SC = FunctionDecl::None; 2606 } 2607 2608 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2609 if (FTI.TypeQuals != 0) { 2610 if (FTI.TypeQuals & Qualifiers::Const) 2611 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2612 << "const" << SourceRange(D.getIdentifierLoc()); 2613 if (FTI.TypeQuals & Qualifiers::Volatile) 2614 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2615 << "volatile" << SourceRange(D.getIdentifierLoc()); 2616 if (FTI.TypeQuals & Qualifiers::Restrict) 2617 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2618 << "restrict" << SourceRange(D.getIdentifierLoc()); 2619 } 2620 2621 // Rebuild the function type "R" without any type qualifiers (in 2622 // case any of the errors above fired) and with "void" as the 2623 // return type, since constructors don't have return types. We 2624 // *always* have to do this, because GetTypeForDeclarator will 2625 // put in a result type of "int" when none was specified. 2626 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2627 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2628 Proto->getNumArgs(), 2629 Proto->isVariadic(), 0, 2630 Proto->hasExceptionSpec(), 2631 Proto->hasAnyExceptionSpec(), 2632 Proto->getNumExceptions(), 2633 Proto->exception_begin(), 2634 Proto->getExtInfo()); 2635} 2636 2637/// CheckConstructor - Checks a fully-formed constructor for 2638/// well-formedness, issuing any diagnostics required. Returns true if 2639/// the constructor declarator is invalid. 2640void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2641 CXXRecordDecl *ClassDecl 2642 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2643 if (!ClassDecl) 2644 return Constructor->setInvalidDecl(); 2645 2646 // C++ [class.copy]p3: 2647 // A declaration of a constructor for a class X is ill-formed if 2648 // its first parameter is of type (optionally cv-qualified) X and 2649 // either there are no other parameters or else all other 2650 // parameters have default arguments. 2651 if (!Constructor->isInvalidDecl() && 2652 ((Constructor->getNumParams() == 1) || 2653 (Constructor->getNumParams() > 1 && 2654 Constructor->getParamDecl(1)->hasDefaultArg())) && 2655 Constructor->getTemplateSpecializationKind() 2656 != TSK_ImplicitInstantiation) { 2657 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2658 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2659 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2660 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2661 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2662 << FixItHint::CreateInsertion(ParamLoc, " const &"); 2663 2664 // FIXME: Rather that making the constructor invalid, we should endeavor 2665 // to fix the type. 2666 Constructor->setInvalidDecl(); 2667 } 2668 } 2669 2670 // Notify the class that we've added a constructor. 2671 ClassDecl->addedConstructor(Context, Constructor); 2672} 2673 2674/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2675/// issuing any diagnostics required. Returns true on error. 2676bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2677 CXXRecordDecl *RD = Destructor->getParent(); 2678 2679 if (Destructor->isVirtual()) { 2680 SourceLocation Loc; 2681 2682 if (!Destructor->isImplicit()) 2683 Loc = Destructor->getLocation(); 2684 else 2685 Loc = RD->getLocation(); 2686 2687 // If we have a virtual destructor, look up the deallocation function 2688 FunctionDecl *OperatorDelete = 0; 2689 DeclarationName Name = 2690 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2691 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2692 return true; 2693 2694 Destructor->setOperatorDelete(OperatorDelete); 2695 } 2696 2697 return false; 2698} 2699 2700static inline bool 2701FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2702 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2703 FTI.ArgInfo[0].Param && 2704 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2705} 2706 2707/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2708/// the well-formednes of the destructor declarator @p D with type @p 2709/// R. If there are any errors in the declarator, this routine will 2710/// emit diagnostics and set the declarator to invalid. Even if this happens, 2711/// will be updated to reflect a well-formed type for the destructor and 2712/// returned. 2713QualType Sema::CheckDestructorDeclarator(Declarator &D, 2714 FunctionDecl::StorageClass& SC) { 2715 // C++ [class.dtor]p1: 2716 // [...] A typedef-name that names a class is a class-name 2717 // (7.1.3); however, a typedef-name that names a class shall not 2718 // be used as the identifier in the declarator for a destructor 2719 // declaration. 2720 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2721 if (isa<TypedefType>(DeclaratorType)) { 2722 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2723 << DeclaratorType; 2724 D.setInvalidType(); 2725 } 2726 2727 // C++ [class.dtor]p2: 2728 // A destructor is used to destroy objects of its class type. A 2729 // destructor takes no parameters, and no return type can be 2730 // specified for it (not even void). The address of a destructor 2731 // shall not be taken. A destructor shall not be static. A 2732 // destructor can be invoked for a const, volatile or const 2733 // volatile object. A destructor shall not be declared const, 2734 // volatile or const volatile (9.3.2). 2735 if (SC == FunctionDecl::Static) { 2736 if (!D.isInvalidType()) 2737 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2738 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2739 << SourceRange(D.getIdentifierLoc()); 2740 SC = FunctionDecl::None; 2741 D.setInvalidType(); 2742 } 2743 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2744 // Destructors don't have return types, but the parser will 2745 // happily parse something like: 2746 // 2747 // class X { 2748 // float ~X(); 2749 // }; 2750 // 2751 // The return type will be eliminated later. 2752 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2753 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2754 << SourceRange(D.getIdentifierLoc()); 2755 } 2756 2757 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2758 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2759 if (FTI.TypeQuals & Qualifiers::Const) 2760 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2761 << "const" << SourceRange(D.getIdentifierLoc()); 2762 if (FTI.TypeQuals & Qualifiers::Volatile) 2763 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2764 << "volatile" << SourceRange(D.getIdentifierLoc()); 2765 if (FTI.TypeQuals & Qualifiers::Restrict) 2766 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2767 << "restrict" << SourceRange(D.getIdentifierLoc()); 2768 D.setInvalidType(); 2769 } 2770 2771 // Make sure we don't have any parameters. 2772 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2773 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2774 2775 // Delete the parameters. 2776 FTI.freeArgs(); 2777 D.setInvalidType(); 2778 } 2779 2780 // Make sure the destructor isn't variadic. 2781 if (FTI.isVariadic) { 2782 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2783 D.setInvalidType(); 2784 } 2785 2786 // Rebuild the function type "R" without any type qualifiers or 2787 // parameters (in case any of the errors above fired) and with 2788 // "void" as the return type, since destructors don't have return 2789 // types. We *always* have to do this, because GetTypeForDeclarator 2790 // will put in a result type of "int" when none was specified. 2791 // FIXME: Exceptions! 2792 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 2793 false, false, 0, 0, FunctionType::ExtInfo()); 2794} 2795 2796/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2797/// well-formednes of the conversion function declarator @p D with 2798/// type @p R. If there are any errors in the declarator, this routine 2799/// will emit diagnostics and return true. Otherwise, it will return 2800/// false. Either way, the type @p R will be updated to reflect a 2801/// well-formed type for the conversion operator. 2802void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2803 FunctionDecl::StorageClass& SC) { 2804 // C++ [class.conv.fct]p1: 2805 // Neither parameter types nor return type can be specified. The 2806 // type of a conversion function (8.3.5) is "function taking no 2807 // parameter returning conversion-type-id." 2808 if (SC == FunctionDecl::Static) { 2809 if (!D.isInvalidType()) 2810 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2811 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2812 << SourceRange(D.getIdentifierLoc()); 2813 D.setInvalidType(); 2814 SC = FunctionDecl::None; 2815 } 2816 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2817 // Conversion functions don't have return types, but the parser will 2818 // happily parse something like: 2819 // 2820 // class X { 2821 // float operator bool(); 2822 // }; 2823 // 2824 // The return type will be changed later anyway. 2825 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2826 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2827 << SourceRange(D.getIdentifierLoc()); 2828 } 2829 2830 // Make sure we don't have any parameters. 2831 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2832 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2833 2834 // Delete the parameters. 2835 D.getTypeObject(0).Fun.freeArgs(); 2836 D.setInvalidType(); 2837 } 2838 2839 // Make sure the conversion function isn't variadic. 2840 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2841 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2842 D.setInvalidType(); 2843 } 2844 2845 // C++ [class.conv.fct]p4: 2846 // The conversion-type-id shall not represent a function type nor 2847 // an array type. 2848 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2849 if (ConvType->isArrayType()) { 2850 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2851 ConvType = Context.getPointerType(ConvType); 2852 D.setInvalidType(); 2853 } else if (ConvType->isFunctionType()) { 2854 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2855 ConvType = Context.getPointerType(ConvType); 2856 D.setInvalidType(); 2857 } 2858 2859 // Rebuild the function type "R" without any parameters (in case any 2860 // of the errors above fired) and with the conversion type as the 2861 // return type. 2862 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2863 R = Context.getFunctionType(ConvType, 0, 0, false, 2864 Proto->getTypeQuals(), 2865 Proto->hasExceptionSpec(), 2866 Proto->hasAnyExceptionSpec(), 2867 Proto->getNumExceptions(), 2868 Proto->exception_begin(), 2869 Proto->getExtInfo()); 2870 2871 // C++0x explicit conversion operators. 2872 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2873 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2874 diag::warn_explicit_conversion_functions) 2875 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2876} 2877 2878/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2879/// the declaration of the given C++ conversion function. This routine 2880/// is responsible for recording the conversion function in the C++ 2881/// class, if possible. 2882Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2883 assert(Conversion && "Expected to receive a conversion function declaration"); 2884 2885 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2886 2887 // Make sure we aren't redeclaring the conversion function. 2888 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2889 2890 // C++ [class.conv.fct]p1: 2891 // [...] A conversion function is never used to convert a 2892 // (possibly cv-qualified) object to the (possibly cv-qualified) 2893 // same object type (or a reference to it), to a (possibly 2894 // cv-qualified) base class of that type (or a reference to it), 2895 // or to (possibly cv-qualified) void. 2896 // FIXME: Suppress this warning if the conversion function ends up being a 2897 // virtual function that overrides a virtual function in a base class. 2898 QualType ClassType 2899 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2900 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2901 ConvType = ConvTypeRef->getPointeeType(); 2902 if (ConvType->isRecordType()) { 2903 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2904 if (ConvType == ClassType) 2905 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2906 << ClassType; 2907 else if (IsDerivedFrom(ClassType, ConvType)) 2908 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2909 << ClassType << ConvType; 2910 } else if (ConvType->isVoidType()) { 2911 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2912 << ClassType << ConvType; 2913 } 2914 2915 if (Conversion->getPrimaryTemplate()) { 2916 // ignore specializations 2917 } else if (Conversion->getPreviousDeclaration()) { 2918 if (FunctionTemplateDecl *ConversionTemplate 2919 = Conversion->getDescribedFunctionTemplate()) { 2920 if (ClassDecl->replaceConversion( 2921 ConversionTemplate->getPreviousDeclaration(), 2922 ConversionTemplate)) 2923 return DeclPtrTy::make(ConversionTemplate); 2924 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 2925 Conversion)) 2926 return DeclPtrTy::make(Conversion); 2927 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2928 } else if (FunctionTemplateDecl *ConversionTemplate 2929 = Conversion->getDescribedFunctionTemplate()) 2930 ClassDecl->addConversionFunction(ConversionTemplate); 2931 else 2932 ClassDecl->addConversionFunction(Conversion); 2933 2934 return DeclPtrTy::make(Conversion); 2935} 2936 2937//===----------------------------------------------------------------------===// 2938// Namespace Handling 2939//===----------------------------------------------------------------------===// 2940 2941/// ActOnStartNamespaceDef - This is called at the start of a namespace 2942/// definition. 2943Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2944 SourceLocation IdentLoc, 2945 IdentifierInfo *II, 2946 SourceLocation LBrace, 2947 AttributeList *AttrList) { 2948 NamespaceDecl *Namespc = 2949 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2950 Namespc->setLBracLoc(LBrace); 2951 2952 Scope *DeclRegionScope = NamespcScope->getParent(); 2953 2954 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 2955 2956 if (II) { 2957 // C++ [namespace.def]p2: 2958 // The identifier in an original-namespace-definition shall not have been 2959 // previously defined in the declarative region in which the 2960 // original-namespace-definition appears. The identifier in an 2961 // original-namespace-definition is the name of the namespace. Subsequently 2962 // in that declarative region, it is treated as an original-namespace-name. 2963 2964 NamedDecl *PrevDecl 2965 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2966 ForRedeclaration); 2967 2968 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2969 // This is an extended namespace definition. 2970 // Attach this namespace decl to the chain of extended namespace 2971 // definitions. 2972 OrigNS->setNextNamespace(Namespc); 2973 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2974 2975 // Remove the previous declaration from the scope. 2976 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2977 IdResolver.RemoveDecl(OrigNS); 2978 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2979 } 2980 } else if (PrevDecl) { 2981 // This is an invalid name redefinition. 2982 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2983 << Namespc->getDeclName(); 2984 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2985 Namespc->setInvalidDecl(); 2986 // Continue on to push Namespc as current DeclContext and return it. 2987 } else if (II->isStr("std") && 2988 CurContext->getLookupContext()->isTranslationUnit()) { 2989 // This is the first "real" definition of the namespace "std", so update 2990 // our cache of the "std" namespace to point at this definition. 2991 if (StdNamespace) { 2992 // We had already defined a dummy namespace "std". Link this new 2993 // namespace definition to the dummy namespace "std". 2994 StdNamespace->setNextNamespace(Namespc); 2995 StdNamespace->setLocation(IdentLoc); 2996 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2997 } 2998 2999 // Make our StdNamespace cache point at the first real definition of the 3000 // "std" namespace. 3001 StdNamespace = Namespc; 3002 } 3003 3004 PushOnScopeChains(Namespc, DeclRegionScope); 3005 } else { 3006 // Anonymous namespaces. 3007 assert(Namespc->isAnonymousNamespace()); 3008 3009 // Link the anonymous namespace into its parent. 3010 NamespaceDecl *PrevDecl; 3011 DeclContext *Parent = CurContext->getLookupContext(); 3012 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3013 PrevDecl = TU->getAnonymousNamespace(); 3014 TU->setAnonymousNamespace(Namespc); 3015 } else { 3016 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3017 PrevDecl = ND->getAnonymousNamespace(); 3018 ND->setAnonymousNamespace(Namespc); 3019 } 3020 3021 // Link the anonymous namespace with its previous declaration. 3022 if (PrevDecl) { 3023 assert(PrevDecl->isAnonymousNamespace()); 3024 assert(!PrevDecl->getNextNamespace()); 3025 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3026 PrevDecl->setNextNamespace(Namespc); 3027 } 3028 3029 CurContext->addDecl(Namespc); 3030 3031 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3032 // behaves as if it were replaced by 3033 // namespace unique { /* empty body */ } 3034 // using namespace unique; 3035 // namespace unique { namespace-body } 3036 // where all occurrences of 'unique' in a translation unit are 3037 // replaced by the same identifier and this identifier differs 3038 // from all other identifiers in the entire program. 3039 3040 // We just create the namespace with an empty name and then add an 3041 // implicit using declaration, just like the standard suggests. 3042 // 3043 // CodeGen enforces the "universally unique" aspect by giving all 3044 // declarations semantically contained within an anonymous 3045 // namespace internal linkage. 3046 3047 if (!PrevDecl) { 3048 UsingDirectiveDecl* UD 3049 = UsingDirectiveDecl::Create(Context, CurContext, 3050 /* 'using' */ LBrace, 3051 /* 'namespace' */ SourceLocation(), 3052 /* qualifier */ SourceRange(), 3053 /* NNS */ NULL, 3054 /* identifier */ SourceLocation(), 3055 Namespc, 3056 /* Ancestor */ CurContext); 3057 UD->setImplicit(); 3058 CurContext->addDecl(UD); 3059 } 3060 } 3061 3062 // Although we could have an invalid decl (i.e. the namespace name is a 3063 // redefinition), push it as current DeclContext and try to continue parsing. 3064 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3065 // for the namespace has the declarations that showed up in that particular 3066 // namespace definition. 3067 PushDeclContext(NamespcScope, Namespc); 3068 return DeclPtrTy::make(Namespc); 3069} 3070 3071/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3072/// is a namespace alias, returns the namespace it points to. 3073static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3074 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3075 return AD->getNamespace(); 3076 return dyn_cast_or_null<NamespaceDecl>(D); 3077} 3078 3079/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3080/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3081void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3082 Decl *Dcl = D.getAs<Decl>(); 3083 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3084 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3085 Namespc->setRBracLoc(RBrace); 3086 PopDeclContext(); 3087} 3088 3089Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3090 SourceLocation UsingLoc, 3091 SourceLocation NamespcLoc, 3092 CXXScopeSpec &SS, 3093 SourceLocation IdentLoc, 3094 IdentifierInfo *NamespcName, 3095 AttributeList *AttrList) { 3096 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3097 assert(NamespcName && "Invalid NamespcName."); 3098 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3099 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3100 3101 UsingDirectiveDecl *UDir = 0; 3102 3103 // Lookup namespace name. 3104 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3105 LookupParsedName(R, S, &SS); 3106 if (R.isAmbiguous()) 3107 return DeclPtrTy(); 3108 3109 if (!R.empty()) { 3110 NamedDecl *Named = R.getFoundDecl(); 3111 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3112 && "expected namespace decl"); 3113 // C++ [namespace.udir]p1: 3114 // A using-directive specifies that the names in the nominated 3115 // namespace can be used in the scope in which the 3116 // using-directive appears after the using-directive. During 3117 // unqualified name lookup (3.4.1), the names appear as if they 3118 // were declared in the nearest enclosing namespace which 3119 // contains both the using-directive and the nominated 3120 // namespace. [Note: in this context, "contains" means "contains 3121 // directly or indirectly". ] 3122 3123 // Find enclosing context containing both using-directive and 3124 // nominated namespace. 3125 NamespaceDecl *NS = getNamespaceDecl(Named); 3126 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3127 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3128 CommonAncestor = CommonAncestor->getParent(); 3129 3130 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3131 SS.getRange(), 3132 (NestedNameSpecifier *)SS.getScopeRep(), 3133 IdentLoc, Named, CommonAncestor); 3134 PushUsingDirective(S, UDir); 3135 } else { 3136 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3137 } 3138 3139 // FIXME: We ignore attributes for now. 3140 delete AttrList; 3141 return DeclPtrTy::make(UDir); 3142} 3143 3144void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3145 // If scope has associated entity, then using directive is at namespace 3146 // or translation unit scope. We add UsingDirectiveDecls, into 3147 // it's lookup structure. 3148 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3149 Ctx->addDecl(UDir); 3150 else 3151 // Otherwise it is block-sope. using-directives will affect lookup 3152 // only to the end of scope. 3153 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3154} 3155 3156 3157Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3158 AccessSpecifier AS, 3159 bool HasUsingKeyword, 3160 SourceLocation UsingLoc, 3161 CXXScopeSpec &SS, 3162 UnqualifiedId &Name, 3163 AttributeList *AttrList, 3164 bool IsTypeName, 3165 SourceLocation TypenameLoc) { 3166 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3167 3168 switch (Name.getKind()) { 3169 case UnqualifiedId::IK_Identifier: 3170 case UnqualifiedId::IK_OperatorFunctionId: 3171 case UnqualifiedId::IK_LiteralOperatorId: 3172 case UnqualifiedId::IK_ConversionFunctionId: 3173 break; 3174 3175 case UnqualifiedId::IK_ConstructorName: 3176 case UnqualifiedId::IK_ConstructorTemplateId: 3177 // C++0x inherited constructors. 3178 if (getLangOptions().CPlusPlus0x) break; 3179 3180 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3181 << SS.getRange(); 3182 return DeclPtrTy(); 3183 3184 case UnqualifiedId::IK_DestructorName: 3185 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3186 << SS.getRange(); 3187 return DeclPtrTy(); 3188 3189 case UnqualifiedId::IK_TemplateId: 3190 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3191 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3192 return DeclPtrTy(); 3193 } 3194 3195 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3196 if (!TargetName) 3197 return DeclPtrTy(); 3198 3199 // Warn about using declarations. 3200 // TODO: store that the declaration was written without 'using' and 3201 // talk about access decls instead of using decls in the 3202 // diagnostics. 3203 if (!HasUsingKeyword) { 3204 UsingLoc = Name.getSourceRange().getBegin(); 3205 3206 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3207 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3208 } 3209 3210 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3211 Name.getSourceRange().getBegin(), 3212 TargetName, AttrList, 3213 /* IsInstantiation */ false, 3214 IsTypeName, TypenameLoc); 3215 if (UD) 3216 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3217 3218 return DeclPtrTy::make(UD); 3219} 3220 3221/// Determines whether to create a using shadow decl for a particular 3222/// decl, given the set of decls existing prior to this using lookup. 3223bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3224 const LookupResult &Previous) { 3225 // Diagnose finding a decl which is not from a base class of the 3226 // current class. We do this now because there are cases where this 3227 // function will silently decide not to build a shadow decl, which 3228 // will pre-empt further diagnostics. 3229 // 3230 // We don't need to do this in C++0x because we do the check once on 3231 // the qualifier. 3232 // 3233 // FIXME: diagnose the following if we care enough: 3234 // struct A { int foo; }; 3235 // struct B : A { using A::foo; }; 3236 // template <class T> struct C : A {}; 3237 // template <class T> struct D : C<T> { using B::foo; } // <--- 3238 // This is invalid (during instantiation) in C++03 because B::foo 3239 // resolves to the using decl in B, which is not a base class of D<T>. 3240 // We can't diagnose it immediately because C<T> is an unknown 3241 // specialization. The UsingShadowDecl in D<T> then points directly 3242 // to A::foo, which will look well-formed when we instantiate. 3243 // The right solution is to not collapse the shadow-decl chain. 3244 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3245 DeclContext *OrigDC = Orig->getDeclContext(); 3246 3247 // Handle enums and anonymous structs. 3248 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3249 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3250 while (OrigRec->isAnonymousStructOrUnion()) 3251 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3252 3253 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3254 if (OrigDC == CurContext) { 3255 Diag(Using->getLocation(), 3256 diag::err_using_decl_nested_name_specifier_is_current_class) 3257 << Using->getNestedNameRange(); 3258 Diag(Orig->getLocation(), diag::note_using_decl_target); 3259 return true; 3260 } 3261 3262 Diag(Using->getNestedNameRange().getBegin(), 3263 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3264 << Using->getTargetNestedNameDecl() 3265 << cast<CXXRecordDecl>(CurContext) 3266 << Using->getNestedNameRange(); 3267 Diag(Orig->getLocation(), diag::note_using_decl_target); 3268 return true; 3269 } 3270 } 3271 3272 if (Previous.empty()) return false; 3273 3274 NamedDecl *Target = Orig; 3275 if (isa<UsingShadowDecl>(Target)) 3276 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3277 3278 // If the target happens to be one of the previous declarations, we 3279 // don't have a conflict. 3280 // 3281 // FIXME: but we might be increasing its access, in which case we 3282 // should redeclare it. 3283 NamedDecl *NonTag = 0, *Tag = 0; 3284 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3285 I != E; ++I) { 3286 NamedDecl *D = (*I)->getUnderlyingDecl(); 3287 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3288 return false; 3289 3290 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3291 } 3292 3293 if (Target->isFunctionOrFunctionTemplate()) { 3294 FunctionDecl *FD; 3295 if (isa<FunctionTemplateDecl>(Target)) 3296 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3297 else 3298 FD = cast<FunctionDecl>(Target); 3299 3300 NamedDecl *OldDecl = 0; 3301 switch (CheckOverload(FD, Previous, OldDecl)) { 3302 case Ovl_Overload: 3303 return false; 3304 3305 case Ovl_NonFunction: 3306 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3307 break; 3308 3309 // We found a decl with the exact signature. 3310 case Ovl_Match: 3311 if (isa<UsingShadowDecl>(OldDecl)) { 3312 // Silently ignore the possible conflict. 3313 return false; 3314 } 3315 3316 // If we're in a record, we want to hide the target, so we 3317 // return true (without a diagnostic) to tell the caller not to 3318 // build a shadow decl. 3319 if (CurContext->isRecord()) 3320 return true; 3321 3322 // If we're not in a record, this is an error. 3323 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3324 break; 3325 } 3326 3327 Diag(Target->getLocation(), diag::note_using_decl_target); 3328 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3329 return true; 3330 } 3331 3332 // Target is not a function. 3333 3334 if (isa<TagDecl>(Target)) { 3335 // No conflict between a tag and a non-tag. 3336 if (!Tag) return false; 3337 3338 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3339 Diag(Target->getLocation(), diag::note_using_decl_target); 3340 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3341 return true; 3342 } 3343 3344 // No conflict between a tag and a non-tag. 3345 if (!NonTag) return false; 3346 3347 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3348 Diag(Target->getLocation(), diag::note_using_decl_target); 3349 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3350 return true; 3351} 3352 3353/// Builds a shadow declaration corresponding to a 'using' declaration. 3354UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3355 UsingDecl *UD, 3356 NamedDecl *Orig) { 3357 3358 // If we resolved to another shadow declaration, just coalesce them. 3359 NamedDecl *Target = Orig; 3360 if (isa<UsingShadowDecl>(Target)) { 3361 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3362 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3363 } 3364 3365 UsingShadowDecl *Shadow 3366 = UsingShadowDecl::Create(Context, CurContext, 3367 UD->getLocation(), UD, Target); 3368 UD->addShadowDecl(Shadow); 3369 3370 if (S) 3371 PushOnScopeChains(Shadow, S); 3372 else 3373 CurContext->addDecl(Shadow); 3374 Shadow->setAccess(UD->getAccess()); 3375 3376 // Register it as a conversion if appropriate. 3377 if (Shadow->getDeclName().getNameKind() 3378 == DeclarationName::CXXConversionFunctionName) 3379 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3380 3381 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3382 Shadow->setInvalidDecl(); 3383 3384 return Shadow; 3385} 3386 3387/// Hides a using shadow declaration. This is required by the current 3388/// using-decl implementation when a resolvable using declaration in a 3389/// class is followed by a declaration which would hide or override 3390/// one or more of the using decl's targets; for example: 3391/// 3392/// struct Base { void foo(int); }; 3393/// struct Derived : Base { 3394/// using Base::foo; 3395/// void foo(int); 3396/// }; 3397/// 3398/// The governing language is C++03 [namespace.udecl]p12: 3399/// 3400/// When a using-declaration brings names from a base class into a 3401/// derived class scope, member functions in the derived class 3402/// override and/or hide member functions with the same name and 3403/// parameter types in a base class (rather than conflicting). 3404/// 3405/// There are two ways to implement this: 3406/// (1) optimistically create shadow decls when they're not hidden 3407/// by existing declarations, or 3408/// (2) don't create any shadow decls (or at least don't make them 3409/// visible) until we've fully parsed/instantiated the class. 3410/// The problem with (1) is that we might have to retroactively remove 3411/// a shadow decl, which requires several O(n) operations because the 3412/// decl structures are (very reasonably) not designed for removal. 3413/// (2) avoids this but is very fiddly and phase-dependent. 3414void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3415 if (Shadow->getDeclName().getNameKind() == 3416 DeclarationName::CXXConversionFunctionName) 3417 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3418 3419 // Remove it from the DeclContext... 3420 Shadow->getDeclContext()->removeDecl(Shadow); 3421 3422 // ...and the scope, if applicable... 3423 if (S) { 3424 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3425 IdResolver.RemoveDecl(Shadow); 3426 } 3427 3428 // ...and the using decl. 3429 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3430 3431 // TODO: complain somehow if Shadow was used. It shouldn't 3432 // be possible for this to happen, because...? 3433} 3434 3435/// Builds a using declaration. 3436/// 3437/// \param IsInstantiation - Whether this call arises from an 3438/// instantiation of an unresolved using declaration. We treat 3439/// the lookup differently for these declarations. 3440NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3441 SourceLocation UsingLoc, 3442 CXXScopeSpec &SS, 3443 SourceLocation IdentLoc, 3444 DeclarationName Name, 3445 AttributeList *AttrList, 3446 bool IsInstantiation, 3447 bool IsTypeName, 3448 SourceLocation TypenameLoc) { 3449 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3450 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3451 3452 // FIXME: We ignore attributes for now. 3453 delete AttrList; 3454 3455 if (SS.isEmpty()) { 3456 Diag(IdentLoc, diag::err_using_requires_qualname); 3457 return 0; 3458 } 3459 3460 // Do the redeclaration lookup in the current scope. 3461 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3462 ForRedeclaration); 3463 Previous.setHideTags(false); 3464 if (S) { 3465 LookupName(Previous, S); 3466 3467 // It is really dumb that we have to do this. 3468 LookupResult::Filter F = Previous.makeFilter(); 3469 while (F.hasNext()) { 3470 NamedDecl *D = F.next(); 3471 if (!isDeclInScope(D, CurContext, S)) 3472 F.erase(); 3473 } 3474 F.done(); 3475 } else { 3476 assert(IsInstantiation && "no scope in non-instantiation"); 3477 assert(CurContext->isRecord() && "scope not record in instantiation"); 3478 LookupQualifiedName(Previous, CurContext); 3479 } 3480 3481 NestedNameSpecifier *NNS = 3482 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3483 3484 // Check for invalid redeclarations. 3485 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3486 return 0; 3487 3488 // Check for bad qualifiers. 3489 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3490 return 0; 3491 3492 DeclContext *LookupContext = computeDeclContext(SS); 3493 NamedDecl *D; 3494 if (!LookupContext) { 3495 if (IsTypeName) { 3496 // FIXME: not all declaration name kinds are legal here 3497 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3498 UsingLoc, TypenameLoc, 3499 SS.getRange(), NNS, 3500 IdentLoc, Name); 3501 } else { 3502 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3503 UsingLoc, SS.getRange(), NNS, 3504 IdentLoc, Name); 3505 } 3506 } else { 3507 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3508 SS.getRange(), UsingLoc, NNS, Name, 3509 IsTypeName); 3510 } 3511 D->setAccess(AS); 3512 CurContext->addDecl(D); 3513 3514 if (!LookupContext) return D; 3515 UsingDecl *UD = cast<UsingDecl>(D); 3516 3517 if (RequireCompleteDeclContext(SS)) { 3518 UD->setInvalidDecl(); 3519 return UD; 3520 } 3521 3522 // Look up the target name. 3523 3524 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3525 3526 // Unlike most lookups, we don't always want to hide tag 3527 // declarations: tag names are visible through the using declaration 3528 // even if hidden by ordinary names, *except* in a dependent context 3529 // where it's important for the sanity of two-phase lookup. 3530 if (!IsInstantiation) 3531 R.setHideTags(false); 3532 3533 LookupQualifiedName(R, LookupContext); 3534 3535 if (R.empty()) { 3536 Diag(IdentLoc, diag::err_no_member) 3537 << Name << LookupContext << SS.getRange(); 3538 UD->setInvalidDecl(); 3539 return UD; 3540 } 3541 3542 if (R.isAmbiguous()) { 3543 UD->setInvalidDecl(); 3544 return UD; 3545 } 3546 3547 if (IsTypeName) { 3548 // If we asked for a typename and got a non-type decl, error out. 3549 if (!R.getAsSingle<TypeDecl>()) { 3550 Diag(IdentLoc, diag::err_using_typename_non_type); 3551 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3552 Diag((*I)->getUnderlyingDecl()->getLocation(), 3553 diag::note_using_decl_target); 3554 UD->setInvalidDecl(); 3555 return UD; 3556 } 3557 } else { 3558 // If we asked for a non-typename and we got a type, error out, 3559 // but only if this is an instantiation of an unresolved using 3560 // decl. Otherwise just silently find the type name. 3561 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3562 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3563 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3564 UD->setInvalidDecl(); 3565 return UD; 3566 } 3567 } 3568 3569 // C++0x N2914 [namespace.udecl]p6: 3570 // A using-declaration shall not name a namespace. 3571 if (R.getAsSingle<NamespaceDecl>()) { 3572 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3573 << SS.getRange(); 3574 UD->setInvalidDecl(); 3575 return UD; 3576 } 3577 3578 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3579 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3580 BuildUsingShadowDecl(S, UD, *I); 3581 } 3582 3583 return UD; 3584} 3585 3586/// Checks that the given using declaration is not an invalid 3587/// redeclaration. Note that this is checking only for the using decl 3588/// itself, not for any ill-formedness among the UsingShadowDecls. 3589bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3590 bool isTypeName, 3591 const CXXScopeSpec &SS, 3592 SourceLocation NameLoc, 3593 const LookupResult &Prev) { 3594 // C++03 [namespace.udecl]p8: 3595 // C++0x [namespace.udecl]p10: 3596 // A using-declaration is a declaration and can therefore be used 3597 // repeatedly where (and only where) multiple declarations are 3598 // allowed. 3599 // That's only in file contexts. 3600 if (CurContext->getLookupContext()->isFileContext()) 3601 return false; 3602 3603 NestedNameSpecifier *Qual 3604 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3605 3606 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3607 NamedDecl *D = *I; 3608 3609 bool DTypename; 3610 NestedNameSpecifier *DQual; 3611 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3612 DTypename = UD->isTypeName(); 3613 DQual = UD->getTargetNestedNameDecl(); 3614 } else if (UnresolvedUsingValueDecl *UD 3615 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3616 DTypename = false; 3617 DQual = UD->getTargetNestedNameSpecifier(); 3618 } else if (UnresolvedUsingTypenameDecl *UD 3619 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3620 DTypename = true; 3621 DQual = UD->getTargetNestedNameSpecifier(); 3622 } else continue; 3623 3624 // using decls differ if one says 'typename' and the other doesn't. 3625 // FIXME: non-dependent using decls? 3626 if (isTypeName != DTypename) continue; 3627 3628 // using decls differ if they name different scopes (but note that 3629 // template instantiation can cause this check to trigger when it 3630 // didn't before instantiation). 3631 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3632 Context.getCanonicalNestedNameSpecifier(DQual)) 3633 continue; 3634 3635 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3636 Diag(D->getLocation(), diag::note_using_decl) << 1; 3637 return true; 3638 } 3639 3640 return false; 3641} 3642 3643 3644/// Checks that the given nested-name qualifier used in a using decl 3645/// in the current context is appropriately related to the current 3646/// scope. If an error is found, diagnoses it and returns true. 3647bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3648 const CXXScopeSpec &SS, 3649 SourceLocation NameLoc) { 3650 DeclContext *NamedContext = computeDeclContext(SS); 3651 3652 if (!CurContext->isRecord()) { 3653 // C++03 [namespace.udecl]p3: 3654 // C++0x [namespace.udecl]p8: 3655 // A using-declaration for a class member shall be a member-declaration. 3656 3657 // If we weren't able to compute a valid scope, it must be a 3658 // dependent class scope. 3659 if (!NamedContext || NamedContext->isRecord()) { 3660 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3661 << SS.getRange(); 3662 return true; 3663 } 3664 3665 // Otherwise, everything is known to be fine. 3666 return false; 3667 } 3668 3669 // The current scope is a record. 3670 3671 // If the named context is dependent, we can't decide much. 3672 if (!NamedContext) { 3673 // FIXME: in C++0x, we can diagnose if we can prove that the 3674 // nested-name-specifier does not refer to a base class, which is 3675 // still possible in some cases. 3676 3677 // Otherwise we have to conservatively report that things might be 3678 // okay. 3679 return false; 3680 } 3681 3682 if (!NamedContext->isRecord()) { 3683 // Ideally this would point at the last name in the specifier, 3684 // but we don't have that level of source info. 3685 Diag(SS.getRange().getBegin(), 3686 diag::err_using_decl_nested_name_specifier_is_not_class) 3687 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3688 return true; 3689 } 3690 3691 if (getLangOptions().CPlusPlus0x) { 3692 // C++0x [namespace.udecl]p3: 3693 // In a using-declaration used as a member-declaration, the 3694 // nested-name-specifier shall name a base class of the class 3695 // being defined. 3696 3697 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3698 cast<CXXRecordDecl>(NamedContext))) { 3699 if (CurContext == NamedContext) { 3700 Diag(NameLoc, 3701 diag::err_using_decl_nested_name_specifier_is_current_class) 3702 << SS.getRange(); 3703 return true; 3704 } 3705 3706 Diag(SS.getRange().getBegin(), 3707 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3708 << (NestedNameSpecifier*) SS.getScopeRep() 3709 << cast<CXXRecordDecl>(CurContext) 3710 << SS.getRange(); 3711 return true; 3712 } 3713 3714 return false; 3715 } 3716 3717 // C++03 [namespace.udecl]p4: 3718 // A using-declaration used as a member-declaration shall refer 3719 // to a member of a base class of the class being defined [etc.]. 3720 3721 // Salient point: SS doesn't have to name a base class as long as 3722 // lookup only finds members from base classes. Therefore we can 3723 // diagnose here only if we can prove that that can't happen, 3724 // i.e. if the class hierarchies provably don't intersect. 3725 3726 // TODO: it would be nice if "definitely valid" results were cached 3727 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3728 // need to be repeated. 3729 3730 struct UserData { 3731 llvm::DenseSet<const CXXRecordDecl*> Bases; 3732 3733 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3734 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3735 Data->Bases.insert(Base); 3736 return true; 3737 } 3738 3739 bool hasDependentBases(const CXXRecordDecl *Class) { 3740 return !Class->forallBases(collect, this); 3741 } 3742 3743 /// Returns true if the base is dependent or is one of the 3744 /// accumulated base classes. 3745 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3746 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3747 return !Data->Bases.count(Base); 3748 } 3749 3750 bool mightShareBases(const CXXRecordDecl *Class) { 3751 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3752 } 3753 }; 3754 3755 UserData Data; 3756 3757 // Returns false if we find a dependent base. 3758 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3759 return false; 3760 3761 // Returns false if the class has a dependent base or if it or one 3762 // of its bases is present in the base set of the current context. 3763 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3764 return false; 3765 3766 Diag(SS.getRange().getBegin(), 3767 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3768 << (NestedNameSpecifier*) SS.getScopeRep() 3769 << cast<CXXRecordDecl>(CurContext) 3770 << SS.getRange(); 3771 3772 return true; 3773} 3774 3775Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3776 SourceLocation NamespaceLoc, 3777 SourceLocation AliasLoc, 3778 IdentifierInfo *Alias, 3779 CXXScopeSpec &SS, 3780 SourceLocation IdentLoc, 3781 IdentifierInfo *Ident) { 3782 3783 // Lookup the namespace name. 3784 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3785 LookupParsedName(R, S, &SS); 3786 3787 // Check if we have a previous declaration with the same name. 3788 if (NamedDecl *PrevDecl 3789 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3790 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3791 // We already have an alias with the same name that points to the same 3792 // namespace, so don't create a new one. 3793 // FIXME: At some point, we'll want to create the (redundant) 3794 // declaration to maintain better source information. 3795 if (!R.isAmbiguous() && !R.empty() && 3796 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 3797 return DeclPtrTy(); 3798 } 3799 3800 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3801 diag::err_redefinition_different_kind; 3802 Diag(AliasLoc, DiagID) << Alias; 3803 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3804 return DeclPtrTy(); 3805 } 3806 3807 if (R.isAmbiguous()) 3808 return DeclPtrTy(); 3809 3810 if (R.empty()) { 3811 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3812 return DeclPtrTy(); 3813 } 3814 3815 NamespaceAliasDecl *AliasDecl = 3816 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3817 Alias, SS.getRange(), 3818 (NestedNameSpecifier *)SS.getScopeRep(), 3819 IdentLoc, R.getFoundDecl()); 3820 3821 PushOnScopeChains(AliasDecl, S); 3822 return DeclPtrTy::make(AliasDecl); 3823} 3824 3825void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3826 CXXConstructorDecl *Constructor) { 3827 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3828 !Constructor->isUsed()) && 3829 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3830 3831 CXXRecordDecl *ClassDecl 3832 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3833 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3834 3835 DeclContext *PreviousContext = CurContext; 3836 CurContext = Constructor; 3837 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false)) { 3838 Diag(CurrentLocation, diag::note_member_synthesized_at) 3839 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 3840 Constructor->setInvalidDecl(); 3841 } else { 3842 Constructor->setUsed(); 3843 } 3844 CurContext = PreviousContext; 3845} 3846 3847void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3848 CXXDestructorDecl *Destructor) { 3849 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3850 "DefineImplicitDestructor - call it for implicit default dtor"); 3851 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3852 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3853 3854 DeclContext *PreviousContext = CurContext; 3855 CurContext = Destructor; 3856 3857 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 3858 Destructor->getParent()); 3859 3860 // FIXME: If CheckDestructor fails, we should emit a note about where the 3861 // implicit destructor was needed. 3862 if (CheckDestructor(Destructor)) { 3863 Diag(CurrentLocation, diag::note_member_synthesized_at) 3864 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3865 3866 Destructor->setInvalidDecl(); 3867 CurContext = PreviousContext; 3868 3869 return; 3870 } 3871 CurContext = PreviousContext; 3872 3873 Destructor->setUsed(); 3874} 3875 3876void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3877 CXXMethodDecl *MethodDecl) { 3878 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3879 MethodDecl->getOverloadedOperator() == OO_Equal && 3880 !MethodDecl->isUsed()) && 3881 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3882 3883 CXXRecordDecl *ClassDecl 3884 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3885 3886 DeclContext *PreviousContext = CurContext; 3887 CurContext = MethodDecl; 3888 3889 // C++[class.copy] p12 3890 // Before the implicitly-declared copy assignment operator for a class is 3891 // implicitly defined, all implicitly-declared copy assignment operators 3892 // for its direct base classes and its nonstatic data members shall have 3893 // been implicitly defined. 3894 bool err = false; 3895 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3896 E = ClassDecl->bases_end(); Base != E; ++Base) { 3897 CXXRecordDecl *BaseClassDecl 3898 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3899 if (CXXMethodDecl *BaseAssignOpMethod = 3900 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3901 BaseClassDecl)) { 3902 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 3903 BaseAssignOpMethod, 3904 PDiag(diag::err_access_assign_base) 3905 << Base->getType()); 3906 3907 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3908 } 3909 } 3910 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3911 E = ClassDecl->field_end(); Field != E; ++Field) { 3912 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3913 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3914 FieldType = Array->getElementType(); 3915 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3916 CXXRecordDecl *FieldClassDecl 3917 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3918 if (CXXMethodDecl *FieldAssignOpMethod = 3919 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3920 FieldClassDecl)) { 3921 CheckDirectMemberAccess(Field->getLocation(), 3922 FieldAssignOpMethod, 3923 PDiag(diag::err_access_assign_field) 3924 << Field->getDeclName() << Field->getType()); 3925 3926 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3927 } 3928 } else if (FieldType->isReferenceType()) { 3929 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3930 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3931 Diag(Field->getLocation(), diag::note_declared_at); 3932 Diag(CurrentLocation, diag::note_first_required_here); 3933 err = true; 3934 } else if (FieldType.isConstQualified()) { 3935 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3936 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3937 Diag(Field->getLocation(), diag::note_declared_at); 3938 Diag(CurrentLocation, diag::note_first_required_here); 3939 err = true; 3940 } 3941 } 3942 if (!err) 3943 MethodDecl->setUsed(); 3944 3945 CurContext = PreviousContext; 3946} 3947 3948CXXMethodDecl * 3949Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 3950 ParmVarDecl *ParmDecl, 3951 CXXRecordDecl *ClassDecl) { 3952 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3953 QualType RHSType(LHSType); 3954 // If class's assignment operator argument is const/volatile qualified, 3955 // look for operator = (const/volatile B&). Otherwise, look for 3956 // operator = (B&). 3957 RHSType = Context.getCVRQualifiedType(RHSType, 3958 ParmDecl->getType().getCVRQualifiers()); 3959 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3960 LHSType, 3961 SourceLocation())); 3962 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3963 RHSType, 3964 CurrentLocation)); 3965 Expr *Args[2] = { &*LHS, &*RHS }; 3966 OverloadCandidateSet CandidateSet(CurrentLocation); 3967 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3968 CandidateSet); 3969 OverloadCandidateSet::iterator Best; 3970 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 3971 return cast<CXXMethodDecl>(Best->Function); 3972 assert(false && 3973 "getAssignOperatorMethod - copy assignment operator method not found"); 3974 return 0; 3975} 3976 3977void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3978 CXXConstructorDecl *CopyConstructor, 3979 unsigned TypeQuals) { 3980 assert((CopyConstructor->isImplicit() && 3981 CopyConstructor->isCopyConstructor(TypeQuals) && 3982 !CopyConstructor->isUsed()) && 3983 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3984 3985 CXXRecordDecl *ClassDecl 3986 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3987 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3988 3989 DeclContext *PreviousContext = CurContext; 3990 CurContext = CopyConstructor; 3991 3992 // C++ [class.copy] p209 3993 // Before the implicitly-declared copy constructor for a class is 3994 // implicitly defined, all the implicitly-declared copy constructors 3995 // for its base class and its non-static data members shall have been 3996 // implicitly defined. 3997 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3998 Base != ClassDecl->bases_end(); ++Base) { 3999 CXXRecordDecl *BaseClassDecl 4000 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4001 if (CXXConstructorDecl *BaseCopyCtor = 4002 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) { 4003 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 4004 BaseCopyCtor, 4005 PDiag(diag::err_access_copy_base) 4006 << Base->getType()); 4007 4008 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 4009 } 4010 } 4011 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4012 FieldEnd = ClassDecl->field_end(); 4013 Field != FieldEnd; ++Field) { 4014 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 4015 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 4016 FieldType = Array->getElementType(); 4017 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4018 CXXRecordDecl *FieldClassDecl 4019 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4020 if (CXXConstructorDecl *FieldCopyCtor = 4021 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) { 4022 CheckDirectMemberAccess(Field->getLocation(), 4023 FieldCopyCtor, 4024 PDiag(diag::err_access_copy_field) 4025 << Field->getDeclName() << Field->getType()); 4026 4027 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 4028 } 4029 } 4030 } 4031 CopyConstructor->setUsed(); 4032 4033 CurContext = PreviousContext; 4034} 4035 4036Sema::OwningExprResult 4037Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4038 CXXConstructorDecl *Constructor, 4039 MultiExprArg ExprArgs, 4040 bool RequiresZeroInit, 4041 bool BaseInitialization) { 4042 bool Elidable = false; 4043 4044 // C++0x [class.copy]p34: 4045 // When certain criteria are met, an implementation is allowed to 4046 // omit the copy/move construction of a class object, even if the 4047 // copy/move constructor and/or destructor for the object have 4048 // side effects. [...] 4049 // - when a temporary class object that has not been bound to a 4050 // reference (12.2) would be copied/moved to a class object 4051 // with the same cv-unqualified type, the copy/move operation 4052 // can be omitted by constructing the temporary object 4053 // directly into the target of the omitted copy/move 4054 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 4055 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 4056 Elidable = SubExpr->isTemporaryObject() && 4057 Context.hasSameUnqualifiedType(SubExpr->getType(), 4058 Context.getTypeDeclType(Constructor->getParent())); 4059 } 4060 4061 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4062 Elidable, move(ExprArgs), RequiresZeroInit, 4063 BaseInitialization); 4064} 4065 4066/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4067/// including handling of its default argument expressions. 4068Sema::OwningExprResult 4069Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4070 CXXConstructorDecl *Constructor, bool Elidable, 4071 MultiExprArg ExprArgs, 4072 bool RequiresZeroInit, 4073 bool BaseInitialization) { 4074 unsigned NumExprs = ExprArgs.size(); 4075 Expr **Exprs = (Expr **)ExprArgs.release(); 4076 4077 MarkDeclarationReferenced(ConstructLoc, Constructor); 4078 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4079 Constructor, Elidable, Exprs, NumExprs, 4080 RequiresZeroInit, BaseInitialization)); 4081} 4082 4083bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4084 CXXConstructorDecl *Constructor, 4085 MultiExprArg Exprs) { 4086 OwningExprResult TempResult = 4087 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4088 move(Exprs)); 4089 if (TempResult.isInvalid()) 4090 return true; 4091 4092 Expr *Temp = TempResult.takeAs<Expr>(); 4093 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4094 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4095 VD->setInit(Temp); 4096 4097 return false; 4098} 4099 4100void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4101 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4102 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4103 !ClassDecl->hasTrivialDestructor()) { 4104 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4105 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4106 CheckDestructorAccess(VD->getLocation(), Destructor, 4107 PDiag(diag::err_access_dtor_var) 4108 << VD->getDeclName() 4109 << VD->getType()); 4110 } 4111} 4112 4113/// AddCXXDirectInitializerToDecl - This action is called immediately after 4114/// ActOnDeclarator, when a C++ direct initializer is present. 4115/// e.g: "int x(1);" 4116void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4117 SourceLocation LParenLoc, 4118 MultiExprArg Exprs, 4119 SourceLocation *CommaLocs, 4120 SourceLocation RParenLoc) { 4121 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4122 Decl *RealDecl = Dcl.getAs<Decl>(); 4123 4124 // If there is no declaration, there was an error parsing it. Just ignore 4125 // the initializer. 4126 if (RealDecl == 0) 4127 return; 4128 4129 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4130 if (!VDecl) { 4131 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4132 RealDecl->setInvalidDecl(); 4133 return; 4134 } 4135 4136 // We will represent direct-initialization similarly to copy-initialization: 4137 // int x(1); -as-> int x = 1; 4138 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4139 // 4140 // Clients that want to distinguish between the two forms, can check for 4141 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4142 // A major benefit is that clients that don't particularly care about which 4143 // exactly form was it (like the CodeGen) can handle both cases without 4144 // special case code. 4145 4146 // C++ 8.5p11: 4147 // The form of initialization (using parentheses or '=') is generally 4148 // insignificant, but does matter when the entity being initialized has a 4149 // class type. 4150 QualType DeclInitType = VDecl->getType(); 4151 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4152 DeclInitType = Context.getBaseElementType(Array); 4153 4154 if (!VDecl->getType()->isDependentType() && 4155 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4156 diag::err_typecheck_decl_incomplete_type)) { 4157 VDecl->setInvalidDecl(); 4158 return; 4159 } 4160 4161 // The variable can not have an abstract class type. 4162 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4163 diag::err_abstract_type_in_decl, 4164 AbstractVariableType)) 4165 VDecl->setInvalidDecl(); 4166 4167 const VarDecl *Def; 4168 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4169 Diag(VDecl->getLocation(), diag::err_redefinition) 4170 << VDecl->getDeclName(); 4171 Diag(Def->getLocation(), diag::note_previous_definition); 4172 VDecl->setInvalidDecl(); 4173 return; 4174 } 4175 4176 // If either the declaration has a dependent type or if any of the 4177 // expressions is type-dependent, we represent the initialization 4178 // via a ParenListExpr for later use during template instantiation. 4179 if (VDecl->getType()->isDependentType() || 4180 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4181 // Let clients know that initialization was done with a direct initializer. 4182 VDecl->setCXXDirectInitializer(true); 4183 4184 // Store the initialization expressions as a ParenListExpr. 4185 unsigned NumExprs = Exprs.size(); 4186 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4187 (Expr **)Exprs.release(), 4188 NumExprs, RParenLoc)); 4189 return; 4190 } 4191 4192 // Capture the variable that is being initialized and the style of 4193 // initialization. 4194 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4195 4196 // FIXME: Poor source location information. 4197 InitializationKind Kind 4198 = InitializationKind::CreateDirect(VDecl->getLocation(), 4199 LParenLoc, RParenLoc); 4200 4201 InitializationSequence InitSeq(*this, Entity, Kind, 4202 (Expr**)Exprs.get(), Exprs.size()); 4203 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4204 if (Result.isInvalid()) { 4205 VDecl->setInvalidDecl(); 4206 return; 4207 } 4208 4209 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4210 VDecl->setInit(Result.takeAs<Expr>()); 4211 VDecl->setCXXDirectInitializer(true); 4212 4213 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4214 FinalizeVarWithDestructor(VDecl, Record); 4215} 4216 4217/// \brief Add the applicable constructor candidates for an initialization 4218/// by constructor. 4219static void AddConstructorInitializationCandidates(Sema &SemaRef, 4220 QualType ClassType, 4221 Expr **Args, 4222 unsigned NumArgs, 4223 InitializationKind Kind, 4224 OverloadCandidateSet &CandidateSet) { 4225 // C++ [dcl.init]p14: 4226 // If the initialization is direct-initialization, or if it is 4227 // copy-initialization where the cv-unqualified version of the 4228 // source type is the same class as, or a derived class of, the 4229 // class of the destination, constructors are considered. The 4230 // applicable constructors are enumerated (13.3.1.3), and the 4231 // best one is chosen through overload resolution (13.3). The 4232 // constructor so selected is called to initialize the object, 4233 // with the initializer expression(s) as its argument(s). If no 4234 // constructor applies, or the overload resolution is ambiguous, 4235 // the initialization is ill-formed. 4236 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 4237 assert(ClassRec && "Can only initialize a class type here"); 4238 4239 // FIXME: When we decide not to synthesize the implicitly-declared 4240 // constructors, we'll need to make them appear here. 4241 4242 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 4243 DeclarationName ConstructorName 4244 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 4245 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 4246 DeclContext::lookup_const_iterator Con, ConEnd; 4247 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 4248 Con != ConEnd; ++Con) { 4249 DeclAccessPair FoundDecl = DeclAccessPair::make(*Con, (*Con)->getAccess()); 4250 4251 // Find the constructor (which may be a template). 4252 CXXConstructorDecl *Constructor = 0; 4253 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 4254 if (ConstructorTmpl) 4255 Constructor 4256 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 4257 else 4258 Constructor = cast<CXXConstructorDecl>(*Con); 4259 4260 if ((Kind.getKind() == InitializationKind::IK_Direct) || 4261 (Kind.getKind() == InitializationKind::IK_Value) || 4262 (Kind.getKind() == InitializationKind::IK_Copy && 4263 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 4264 ((Kind.getKind() == InitializationKind::IK_Default) && 4265 Constructor->isDefaultConstructor())) { 4266 if (ConstructorTmpl) 4267 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, FoundDecl, 4268 /*ExplicitArgs*/ 0, 4269 Args, NumArgs, CandidateSet); 4270 else 4271 SemaRef.AddOverloadCandidate(Constructor, FoundDecl, 4272 Args, NumArgs, CandidateSet); 4273 } 4274 } 4275} 4276 4277/// \brief Attempt to perform initialization by constructor 4278/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 4279/// copy-initialization. 4280/// 4281/// This routine determines whether initialization by constructor is possible, 4282/// but it does not emit any diagnostics in the case where the initialization 4283/// is ill-formed. 4284/// 4285/// \param ClassType the type of the object being initialized, which must have 4286/// class type. 4287/// 4288/// \param Args the arguments provided to initialize the object 4289/// 4290/// \param NumArgs the number of arguments provided to initialize the object 4291/// 4292/// \param Kind the type of initialization being performed 4293/// 4294/// \returns the constructor used to initialize the object, if successful. 4295/// Otherwise, emits a diagnostic and returns NULL. 4296CXXConstructorDecl * 4297Sema::TryInitializationByConstructor(QualType ClassType, 4298 Expr **Args, unsigned NumArgs, 4299 SourceLocation Loc, 4300 InitializationKind Kind) { 4301 // Build the overload candidate set 4302 OverloadCandidateSet CandidateSet(Loc); 4303 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4304 CandidateSet); 4305 4306 // Determine whether we found a constructor we can use. 4307 OverloadCandidateSet::iterator Best; 4308 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4309 case OR_Success: 4310 case OR_Deleted: 4311 // We found a constructor. Return it. 4312 return cast<CXXConstructorDecl>(Best->Function); 4313 4314 case OR_No_Viable_Function: 4315 case OR_Ambiguous: 4316 // Overload resolution failed. Return nothing. 4317 return 0; 4318 } 4319 4320 // Silence GCC warning 4321 return 0; 4322} 4323 4324/// \brief Given a constructor and the set of arguments provided for the 4325/// constructor, convert the arguments and add any required default arguments 4326/// to form a proper call to this constructor. 4327/// 4328/// \returns true if an error occurred, false otherwise. 4329bool 4330Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4331 MultiExprArg ArgsPtr, 4332 SourceLocation Loc, 4333 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4334 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4335 unsigned NumArgs = ArgsPtr.size(); 4336 Expr **Args = (Expr **)ArgsPtr.get(); 4337 4338 const FunctionProtoType *Proto 4339 = Constructor->getType()->getAs<FunctionProtoType>(); 4340 assert(Proto && "Constructor without a prototype?"); 4341 unsigned NumArgsInProto = Proto->getNumArgs(); 4342 4343 // If too few arguments are available, we'll fill in the rest with defaults. 4344 if (NumArgs < NumArgsInProto) 4345 ConvertedArgs.reserve(NumArgsInProto); 4346 else 4347 ConvertedArgs.reserve(NumArgs); 4348 4349 VariadicCallType CallType = 4350 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4351 llvm::SmallVector<Expr *, 8> AllArgs; 4352 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4353 Proto, 0, Args, NumArgs, AllArgs, 4354 CallType); 4355 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4356 ConvertedArgs.push_back(AllArgs[i]); 4357 return Invalid; 4358} 4359 4360/// CompareReferenceRelationship - Compare the two types T1 and T2 to 4361/// determine whether they are reference-related, 4362/// reference-compatible, reference-compatible with added 4363/// qualification, or incompatible, for use in C++ initialization by 4364/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 4365/// type, and the first type (T1) is the pointee type of the reference 4366/// type being initialized. 4367Sema::ReferenceCompareResult 4368Sema::CompareReferenceRelationship(SourceLocation Loc, 4369 QualType OrigT1, QualType OrigT2, 4370 bool& DerivedToBase) { 4371 assert(!OrigT1->isReferenceType() && 4372 "T1 must be the pointee type of the reference type"); 4373 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 4374 4375 QualType T1 = Context.getCanonicalType(OrigT1); 4376 QualType T2 = Context.getCanonicalType(OrigT2); 4377 Qualifiers T1Quals, T2Quals; 4378 QualType UnqualT1 = Context.getUnqualifiedArrayType(T1, T1Quals); 4379 QualType UnqualT2 = Context.getUnqualifiedArrayType(T2, T2Quals); 4380 4381 // C++ [dcl.init.ref]p4: 4382 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 4383 // reference-related to "cv2 T2" if T1 is the same type as T2, or 4384 // T1 is a base class of T2. 4385 if (UnqualT1 == UnqualT2) 4386 DerivedToBase = false; 4387 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 4388 !RequireCompleteType(Loc, OrigT2, PDiag()) && 4389 IsDerivedFrom(UnqualT2, UnqualT1)) 4390 DerivedToBase = true; 4391 else 4392 return Ref_Incompatible; 4393 4394 // At this point, we know that T1 and T2 are reference-related (at 4395 // least). 4396 4397 // If the type is an array type, promote the element qualifiers to the type 4398 // for comparison. 4399 if (isa<ArrayType>(T1) && T1Quals) 4400 T1 = Context.getQualifiedType(UnqualT1, T1Quals); 4401 if (isa<ArrayType>(T2) && T2Quals) 4402 T2 = Context.getQualifiedType(UnqualT2, T2Quals); 4403 4404 // C++ [dcl.init.ref]p4: 4405 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 4406 // reference-related to T2 and cv1 is the same cv-qualification 4407 // as, or greater cv-qualification than, cv2. For purposes of 4408 // overload resolution, cases for which cv1 is greater 4409 // cv-qualification than cv2 are identified as 4410 // reference-compatible with added qualification (see 13.3.3.2). 4411 if (T1Quals.getCVRQualifiers() == T2Quals.getCVRQualifiers()) 4412 return Ref_Compatible; 4413 else if (T1.isMoreQualifiedThan(T2)) 4414 return Ref_Compatible_With_Added_Qualification; 4415 else 4416 return Ref_Related; 4417} 4418 4419/// CheckReferenceInit - Check the initialization of a reference 4420/// variable with the given initializer (C++ [dcl.init.ref]). Init is 4421/// the initializer (either a simple initializer or an initializer 4422/// list), and DeclType is the type of the declaration. When ICS is 4423/// non-null, this routine will compute the implicit conversion 4424/// sequence according to C++ [over.ics.ref] and will not produce any 4425/// diagnostics; when ICS is null, it will emit diagnostics when any 4426/// errors are found. Either way, a return value of true indicates 4427/// that there was a failure, a return value of false indicates that 4428/// the reference initialization succeeded. 4429/// 4430/// When @p SuppressUserConversions, user-defined conversions are 4431/// suppressed. 4432/// When @p AllowExplicit, we also permit explicit user-defined 4433/// conversion functions. 4434/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 4435/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 4436/// This is used when this is called from a C-style cast. 4437bool 4438Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 4439 SourceLocation DeclLoc, 4440 bool SuppressUserConversions, 4441 bool AllowExplicit, bool ForceRValue, 4442 ImplicitConversionSequence *ICS, 4443 bool IgnoreBaseAccess) { 4444 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 4445 4446 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 4447 QualType T2 = Init->getType(); 4448 4449 // If the initializer is the address of an overloaded function, try 4450 // to resolve the overloaded function. If all goes well, T2 is the 4451 // type of the resulting function. 4452 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 4453 DeclAccessPair Found; 4454 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 4455 ICS != 0, Found); 4456 if (Fn) { 4457 // Since we're performing this reference-initialization for 4458 // real, update the initializer with the resulting function. 4459 if (!ICS) { 4460 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 4461 return true; 4462 4463 CheckAddressOfMemberAccess(Init, Found); 4464 Init = FixOverloadedFunctionReference(Init, Found, Fn); 4465 } 4466 4467 T2 = Fn->getType(); 4468 } 4469 } 4470 4471 // Compute some basic properties of the types and the initializer. 4472 bool isRValRef = DeclType->isRValueReferenceType(); 4473 bool DerivedToBase = false; 4474 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 4475 Init->isLvalue(Context); 4476 ReferenceCompareResult RefRelationship 4477 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 4478 4479 // Most paths end in a failed conversion. 4480 if (ICS) { 4481 ICS->setBad(BadConversionSequence::no_conversion, Init, DeclType); 4482 } 4483 4484 // C++ [dcl.init.ref]p5: 4485 // A reference to type "cv1 T1" is initialized by an expression 4486 // of type "cv2 T2" as follows: 4487 4488 // -- If the initializer expression 4489 4490 // Rvalue references cannot bind to lvalues (N2812). 4491 // There is absolutely no situation where they can. In particular, note that 4492 // this is ill-formed, even if B has a user-defined conversion to A&&: 4493 // B b; 4494 // A&& r = b; 4495 if (isRValRef && InitLvalue == Expr::LV_Valid) { 4496 if (!ICS) 4497 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4498 << Init->getSourceRange(); 4499 return true; 4500 } 4501 4502 bool BindsDirectly = false; 4503 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 4504 // reference-compatible with "cv2 T2," or 4505 // 4506 // Note that the bit-field check is skipped if we are just computing 4507 // the implicit conversion sequence (C++ [over.best.ics]p2). 4508 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 4509 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4510 BindsDirectly = true; 4511 4512 if (ICS) { 4513 // C++ [over.ics.ref]p1: 4514 // When a parameter of reference type binds directly (8.5.3) 4515 // to an argument expression, the implicit conversion sequence 4516 // is the identity conversion, unless the argument expression 4517 // has a type that is a derived class of the parameter type, 4518 // in which case the implicit conversion sequence is a 4519 // derived-to-base Conversion (13.3.3.1). 4520 ICS->setStandard(); 4521 ICS->Standard.First = ICK_Identity; 4522 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4523 ICS->Standard.Third = ICK_Identity; 4524 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4525 ICS->Standard.setToType(0, T2); 4526 ICS->Standard.setToType(1, T1); 4527 ICS->Standard.setToType(2, T1); 4528 ICS->Standard.ReferenceBinding = true; 4529 ICS->Standard.DirectBinding = true; 4530 ICS->Standard.RRefBinding = false; 4531 ICS->Standard.CopyConstructor = 0; 4532 4533 // Nothing more to do: the inaccessibility/ambiguity check for 4534 // derived-to-base conversions is suppressed when we're 4535 // computing the implicit conversion sequence (C++ 4536 // [over.best.ics]p2). 4537 return false; 4538 } else { 4539 // Perform the conversion. 4540 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4541 if (DerivedToBase) 4542 CK = CastExpr::CK_DerivedToBase; 4543 else if(CheckExceptionSpecCompatibility(Init, T1)) 4544 return true; 4545 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 4546 } 4547 } 4548 4549 // -- has a class type (i.e., T2 is a class type) and can be 4550 // implicitly converted to an lvalue of type "cv3 T3," 4551 // where "cv1 T1" is reference-compatible with "cv3 T3" 4552 // 92) (this conversion is selected by enumerating the 4553 // applicable conversion functions (13.3.1.6) and choosing 4554 // the best one through overload resolution (13.3)), 4555 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 4556 !RequireCompleteType(DeclLoc, T2, 0)) { 4557 CXXRecordDecl *T2RecordDecl 4558 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 4559 4560 OverloadCandidateSet CandidateSet(DeclLoc); 4561 const UnresolvedSetImpl *Conversions 4562 = T2RecordDecl->getVisibleConversionFunctions(); 4563 for (UnresolvedSetImpl::iterator I = Conversions->begin(), 4564 E = Conversions->end(); I != E; ++I) { 4565 NamedDecl *D = *I; 4566 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); 4567 if (isa<UsingShadowDecl>(D)) 4568 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 4569 4570 FunctionTemplateDecl *ConvTemplate 4571 = dyn_cast<FunctionTemplateDecl>(D); 4572 CXXConversionDecl *Conv; 4573 if (ConvTemplate) 4574 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 4575 else 4576 Conv = cast<CXXConversionDecl>(D); 4577 4578 // If the conversion function doesn't return a reference type, 4579 // it can't be considered for this conversion. 4580 if (Conv->getConversionType()->isLValueReferenceType() && 4581 (AllowExplicit || !Conv->isExplicit())) { 4582 if (ConvTemplate) 4583 AddTemplateConversionCandidate(ConvTemplate, I.getPair(), ActingDC, 4584 Init, DeclType, CandidateSet); 4585 else 4586 AddConversionCandidate(Conv, I.getPair(), ActingDC, Init, 4587 DeclType, CandidateSet); 4588 } 4589 } 4590 4591 OverloadCandidateSet::iterator Best; 4592 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 4593 case OR_Success: 4594 // C++ [over.ics.ref]p1: 4595 // 4596 // [...] If the parameter binds directly to the result of 4597 // applying a conversion function to the argument 4598 // expression, the implicit conversion sequence is a 4599 // user-defined conversion sequence (13.3.3.1.2), with the 4600 // second standard conversion sequence either an identity 4601 // conversion or, if the conversion function returns an 4602 // entity of a type that is a derived class of the parameter 4603 // type, a derived-to-base Conversion. 4604 if (!Best->FinalConversion.DirectBinding) 4605 break; 4606 4607 // This is a direct binding. 4608 BindsDirectly = true; 4609 4610 if (ICS) { 4611 ICS->setUserDefined(); 4612 ICS->UserDefined.Before = Best->Conversions[0].Standard; 4613 ICS->UserDefined.After = Best->FinalConversion; 4614 ICS->UserDefined.ConversionFunction = Best->Function; 4615 ICS->UserDefined.EllipsisConversion = false; 4616 assert(ICS->UserDefined.After.ReferenceBinding && 4617 ICS->UserDefined.After.DirectBinding && 4618 "Expected a direct reference binding!"); 4619 return false; 4620 } else { 4621 OwningExprResult InitConversion = 4622 BuildCXXCastArgument(DeclLoc, QualType(), 4623 CastExpr::CK_UserDefinedConversion, 4624 cast<CXXMethodDecl>(Best->Function), 4625 Owned(Init)); 4626 Init = InitConversion.takeAs<Expr>(); 4627 4628 if (CheckExceptionSpecCompatibility(Init, T1)) 4629 return true; 4630 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 4631 /*isLvalue=*/true); 4632 } 4633 break; 4634 4635 case OR_Ambiguous: 4636 if (ICS) { 4637 ICS->setAmbiguous(); 4638 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 4639 Cand != CandidateSet.end(); ++Cand) 4640 if (Cand->Viable) 4641 ICS->Ambiguous.addConversion(Cand->Function); 4642 break; 4643 } 4644 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 4645 << Init->getSourceRange(); 4646 PrintOverloadCandidates(CandidateSet, OCD_ViableCandidates, &Init, 1); 4647 return true; 4648 4649 case OR_No_Viable_Function: 4650 case OR_Deleted: 4651 // There was no suitable conversion, or we found a deleted 4652 // conversion; continue with other checks. 4653 break; 4654 } 4655 } 4656 4657 if (BindsDirectly) { 4658 // C++ [dcl.init.ref]p4: 4659 // [...] In all cases where the reference-related or 4660 // reference-compatible relationship of two types is used to 4661 // establish the validity of a reference binding, and T1 is a 4662 // base class of T2, a program that necessitates such a binding 4663 // is ill-formed if T1 is an inaccessible (clause 11) or 4664 // ambiguous (10.2) base class of T2. 4665 // 4666 // Note that we only check this condition when we're allowed to 4667 // complain about errors, because we should not be checking for 4668 // ambiguity (or inaccessibility) unless the reference binding 4669 // actually happens. 4670 if (DerivedToBase) 4671 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 4672 Init->getSourceRange(), 4673 IgnoreBaseAccess); 4674 else 4675 return false; 4676 } 4677 4678 // -- Otherwise, the reference shall be to a non-volatile const 4679 // type (i.e., cv1 shall be const), or the reference shall be an 4680 // rvalue reference and the initializer expression shall be an rvalue. 4681 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4682 if (!ICS) 4683 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4684 << T1.isVolatileQualified() 4685 << T1 << int(InitLvalue != Expr::LV_Valid) 4686 << T2 << Init->getSourceRange(); 4687 return true; 4688 } 4689 4690 // -- If the initializer expression is an rvalue, with T2 a 4691 // class type, and "cv1 T1" is reference-compatible with 4692 // "cv2 T2," the reference is bound in one of the 4693 // following ways (the choice is implementation-defined): 4694 // 4695 // -- The reference is bound to the object represented by 4696 // the rvalue (see 3.10) or to a sub-object within that 4697 // object. 4698 // 4699 // -- A temporary of type "cv1 T2" [sic] is created, and 4700 // a constructor is called to copy the entire rvalue 4701 // object into the temporary. The reference is bound to 4702 // the temporary or to a sub-object within the 4703 // temporary. 4704 // 4705 // The constructor that would be used to make the copy 4706 // shall be callable whether or not the copy is actually 4707 // done. 4708 // 4709 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4710 // freedom, so we will always take the first option and never build 4711 // a temporary in this case. FIXME: We will, however, have to check 4712 // for the presence of a copy constructor in C++98/03 mode. 4713 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4714 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4715 if (ICS) { 4716 ICS->setStandard(); 4717 ICS->Standard.First = ICK_Identity; 4718 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4719 ICS->Standard.Third = ICK_Identity; 4720 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4721 ICS->Standard.setToType(0, T2); 4722 ICS->Standard.setToType(1, T1); 4723 ICS->Standard.setToType(2, T1); 4724 ICS->Standard.ReferenceBinding = true; 4725 ICS->Standard.DirectBinding = false; 4726 ICS->Standard.RRefBinding = isRValRef; 4727 ICS->Standard.CopyConstructor = 0; 4728 } else { 4729 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4730 if (DerivedToBase) 4731 CK = CastExpr::CK_DerivedToBase; 4732 else if(CheckExceptionSpecCompatibility(Init, T1)) 4733 return true; 4734 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4735 } 4736 return false; 4737 } 4738 4739 // -- Otherwise, a temporary of type "cv1 T1" is created and 4740 // initialized from the initializer expression using the 4741 // rules for a non-reference copy initialization (8.5). The 4742 // reference is then bound to the temporary. If T1 is 4743 // reference-related to T2, cv1 must be the same 4744 // cv-qualification as, or greater cv-qualification than, 4745 // cv2; otherwise, the program is ill-formed. 4746 if (RefRelationship == Ref_Related) { 4747 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4748 // we would be reference-compatible or reference-compatible with 4749 // added qualification. But that wasn't the case, so the reference 4750 // initialization fails. 4751 if (!ICS) 4752 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4753 << T1 << int(InitLvalue != Expr::LV_Valid) 4754 << T2 << Init->getSourceRange(); 4755 return true; 4756 } 4757 4758 // If at least one of the types is a class type, the types are not 4759 // related, and we aren't allowed any user conversions, the 4760 // reference binding fails. This case is important for breaking 4761 // recursion, since TryImplicitConversion below will attempt to 4762 // create a temporary through the use of a copy constructor. 4763 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4764 (T1->isRecordType() || T2->isRecordType())) { 4765 if (!ICS) 4766 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4767 << DeclType << Init->getType() << AA_Initializing << Init->getSourceRange(); 4768 return true; 4769 } 4770 4771 // Actually try to convert the initializer to T1. 4772 if (ICS) { 4773 // C++ [over.ics.ref]p2: 4774 // 4775 // When a parameter of reference type is not bound directly to 4776 // an argument expression, the conversion sequence is the one 4777 // required to convert the argument expression to the 4778 // underlying type of the reference according to 4779 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4780 // to copy-initializing a temporary of the underlying type with 4781 // the argument expression. Any difference in top-level 4782 // cv-qualification is subsumed by the initialization itself 4783 // and does not constitute a conversion. 4784 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4785 /*AllowExplicit=*/false, 4786 /*ForceRValue=*/false, 4787 /*InOverloadResolution=*/false); 4788 4789 // Of course, that's still a reference binding. 4790 if (ICS->isStandard()) { 4791 ICS->Standard.ReferenceBinding = true; 4792 ICS->Standard.RRefBinding = isRValRef; 4793 } else if (ICS->isUserDefined()) { 4794 ICS->UserDefined.After.ReferenceBinding = true; 4795 ICS->UserDefined.After.RRefBinding = isRValRef; 4796 } 4797 return ICS->isBad(); 4798 } else { 4799 ImplicitConversionSequence Conversions; 4800 bool badConversion = PerformImplicitConversion(Init, T1, AA_Initializing, 4801 false, false, 4802 Conversions); 4803 if (badConversion) { 4804 if (Conversions.isAmbiguous()) { 4805 Diag(DeclLoc, 4806 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4807 for (int j = Conversions.Ambiguous.conversions().size()-1; 4808 j >= 0; j--) { 4809 FunctionDecl *Func = Conversions.Ambiguous.conversions()[j]; 4810 NoteOverloadCandidate(Func); 4811 } 4812 } 4813 else { 4814 if (isRValRef) 4815 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4816 << Init->getSourceRange(); 4817 else 4818 Diag(DeclLoc, diag::err_invalid_initialization) 4819 << DeclType << Init->getType() << Init->getSourceRange(); 4820 } 4821 } 4822 return badConversion; 4823 } 4824} 4825 4826static inline bool 4827CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4828 const FunctionDecl *FnDecl) { 4829 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4830 if (isa<NamespaceDecl>(DC)) { 4831 return SemaRef.Diag(FnDecl->getLocation(), 4832 diag::err_operator_new_delete_declared_in_namespace) 4833 << FnDecl->getDeclName(); 4834 } 4835 4836 if (isa<TranslationUnitDecl>(DC) && 4837 FnDecl->getStorageClass() == FunctionDecl::Static) { 4838 return SemaRef.Diag(FnDecl->getLocation(), 4839 diag::err_operator_new_delete_declared_static) 4840 << FnDecl->getDeclName(); 4841 } 4842 4843 return false; 4844} 4845 4846static inline bool 4847CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4848 CanQualType ExpectedResultType, 4849 CanQualType ExpectedFirstParamType, 4850 unsigned DependentParamTypeDiag, 4851 unsigned InvalidParamTypeDiag) { 4852 QualType ResultType = 4853 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4854 4855 // Check that the result type is not dependent. 4856 if (ResultType->isDependentType()) 4857 return SemaRef.Diag(FnDecl->getLocation(), 4858 diag::err_operator_new_delete_dependent_result_type) 4859 << FnDecl->getDeclName() << ExpectedResultType; 4860 4861 // Check that the result type is what we expect. 4862 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4863 return SemaRef.Diag(FnDecl->getLocation(), 4864 diag::err_operator_new_delete_invalid_result_type) 4865 << FnDecl->getDeclName() << ExpectedResultType; 4866 4867 // A function template must have at least 2 parameters. 4868 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4869 return SemaRef.Diag(FnDecl->getLocation(), 4870 diag::err_operator_new_delete_template_too_few_parameters) 4871 << FnDecl->getDeclName(); 4872 4873 // The function decl must have at least 1 parameter. 4874 if (FnDecl->getNumParams() == 0) 4875 return SemaRef.Diag(FnDecl->getLocation(), 4876 diag::err_operator_new_delete_too_few_parameters) 4877 << FnDecl->getDeclName(); 4878 4879 // Check the the first parameter type is not dependent. 4880 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4881 if (FirstParamType->isDependentType()) 4882 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4883 << FnDecl->getDeclName() << ExpectedFirstParamType; 4884 4885 // Check that the first parameter type is what we expect. 4886 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4887 ExpectedFirstParamType) 4888 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4889 << FnDecl->getDeclName() << ExpectedFirstParamType; 4890 4891 return false; 4892} 4893 4894static bool 4895CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4896 // C++ [basic.stc.dynamic.allocation]p1: 4897 // A program is ill-formed if an allocation function is declared in a 4898 // namespace scope other than global scope or declared static in global 4899 // scope. 4900 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4901 return true; 4902 4903 CanQualType SizeTy = 4904 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4905 4906 // C++ [basic.stc.dynamic.allocation]p1: 4907 // The return type shall be void*. The first parameter shall have type 4908 // std::size_t. 4909 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4910 SizeTy, 4911 diag::err_operator_new_dependent_param_type, 4912 diag::err_operator_new_param_type)) 4913 return true; 4914 4915 // C++ [basic.stc.dynamic.allocation]p1: 4916 // The first parameter shall not have an associated default argument. 4917 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4918 return SemaRef.Diag(FnDecl->getLocation(), 4919 diag::err_operator_new_default_arg) 4920 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4921 4922 return false; 4923} 4924 4925static bool 4926CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4927 // C++ [basic.stc.dynamic.deallocation]p1: 4928 // A program is ill-formed if deallocation functions are declared in a 4929 // namespace scope other than global scope or declared static in global 4930 // scope. 4931 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4932 return true; 4933 4934 // C++ [basic.stc.dynamic.deallocation]p2: 4935 // Each deallocation function shall return void and its first parameter 4936 // shall be void*. 4937 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4938 SemaRef.Context.VoidPtrTy, 4939 diag::err_operator_delete_dependent_param_type, 4940 diag::err_operator_delete_param_type)) 4941 return true; 4942 4943 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4944 if (FirstParamType->isDependentType()) 4945 return SemaRef.Diag(FnDecl->getLocation(), 4946 diag::err_operator_delete_dependent_param_type) 4947 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4948 4949 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4950 SemaRef.Context.VoidPtrTy) 4951 return SemaRef.Diag(FnDecl->getLocation(), 4952 diag::err_operator_delete_param_type) 4953 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4954 4955 return false; 4956} 4957 4958/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4959/// of this overloaded operator is well-formed. If so, returns false; 4960/// otherwise, emits appropriate diagnostics and returns true. 4961bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4962 assert(FnDecl && FnDecl->isOverloadedOperator() && 4963 "Expected an overloaded operator declaration"); 4964 4965 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4966 4967 // C++ [over.oper]p5: 4968 // The allocation and deallocation functions, operator new, 4969 // operator new[], operator delete and operator delete[], are 4970 // described completely in 3.7.3. The attributes and restrictions 4971 // found in the rest of this subclause do not apply to them unless 4972 // explicitly stated in 3.7.3. 4973 if (Op == OO_Delete || Op == OO_Array_Delete) 4974 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4975 4976 if (Op == OO_New || Op == OO_Array_New) 4977 return CheckOperatorNewDeclaration(*this, FnDecl); 4978 4979 // C++ [over.oper]p6: 4980 // An operator function shall either be a non-static member 4981 // function or be a non-member function and have at least one 4982 // parameter whose type is a class, a reference to a class, an 4983 // enumeration, or a reference to an enumeration. 4984 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4985 if (MethodDecl->isStatic()) 4986 return Diag(FnDecl->getLocation(), 4987 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4988 } else { 4989 bool ClassOrEnumParam = false; 4990 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4991 ParamEnd = FnDecl->param_end(); 4992 Param != ParamEnd; ++Param) { 4993 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4994 if (ParamType->isDependentType() || ParamType->isRecordType() || 4995 ParamType->isEnumeralType()) { 4996 ClassOrEnumParam = true; 4997 break; 4998 } 4999 } 5000 5001 if (!ClassOrEnumParam) 5002 return Diag(FnDecl->getLocation(), 5003 diag::err_operator_overload_needs_class_or_enum) 5004 << FnDecl->getDeclName(); 5005 } 5006 5007 // C++ [over.oper]p8: 5008 // An operator function cannot have default arguments (8.3.6), 5009 // except where explicitly stated below. 5010 // 5011 // Only the function-call operator allows default arguments 5012 // (C++ [over.call]p1). 5013 if (Op != OO_Call) { 5014 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5015 Param != FnDecl->param_end(); ++Param) { 5016 if ((*Param)->hasDefaultArg()) 5017 return Diag((*Param)->getLocation(), 5018 diag::err_operator_overload_default_arg) 5019 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5020 } 5021 } 5022 5023 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5024 { false, false, false } 5025#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5026 , { Unary, Binary, MemberOnly } 5027#include "clang/Basic/OperatorKinds.def" 5028 }; 5029 5030 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5031 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5032 bool MustBeMemberOperator = OperatorUses[Op][2]; 5033 5034 // C++ [over.oper]p8: 5035 // [...] Operator functions cannot have more or fewer parameters 5036 // than the number required for the corresponding operator, as 5037 // described in the rest of this subclause. 5038 unsigned NumParams = FnDecl->getNumParams() 5039 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5040 if (Op != OO_Call && 5041 ((NumParams == 1 && !CanBeUnaryOperator) || 5042 (NumParams == 2 && !CanBeBinaryOperator) || 5043 (NumParams < 1) || (NumParams > 2))) { 5044 // We have the wrong number of parameters. 5045 unsigned ErrorKind; 5046 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5047 ErrorKind = 2; // 2 -> unary or binary. 5048 } else if (CanBeUnaryOperator) { 5049 ErrorKind = 0; // 0 -> unary 5050 } else { 5051 assert(CanBeBinaryOperator && 5052 "All non-call overloaded operators are unary or binary!"); 5053 ErrorKind = 1; // 1 -> binary 5054 } 5055 5056 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5057 << FnDecl->getDeclName() << NumParams << ErrorKind; 5058 } 5059 5060 // Overloaded operators other than operator() cannot be variadic. 5061 if (Op != OO_Call && 5062 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5063 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5064 << FnDecl->getDeclName(); 5065 } 5066 5067 // Some operators must be non-static member functions. 5068 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5069 return Diag(FnDecl->getLocation(), 5070 diag::err_operator_overload_must_be_member) 5071 << FnDecl->getDeclName(); 5072 } 5073 5074 // C++ [over.inc]p1: 5075 // The user-defined function called operator++ implements the 5076 // prefix and postfix ++ operator. If this function is a member 5077 // function with no parameters, or a non-member function with one 5078 // parameter of class or enumeration type, it defines the prefix 5079 // increment operator ++ for objects of that type. If the function 5080 // is a member function with one parameter (which shall be of type 5081 // int) or a non-member function with two parameters (the second 5082 // of which shall be of type int), it defines the postfix 5083 // increment operator ++ for objects of that type. 5084 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5085 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5086 bool ParamIsInt = false; 5087 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5088 ParamIsInt = BT->getKind() == BuiltinType::Int; 5089 5090 if (!ParamIsInt) 5091 return Diag(LastParam->getLocation(), 5092 diag::err_operator_overload_post_incdec_must_be_int) 5093 << LastParam->getType() << (Op == OO_MinusMinus); 5094 } 5095 5096 // Notify the class if it got an assignment operator. 5097 if (Op == OO_Equal) { 5098 // Would have returned earlier otherwise. 5099 assert(isa<CXXMethodDecl>(FnDecl) && 5100 "Overloaded = not member, but not filtered."); 5101 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5102 Method->getParent()->addedAssignmentOperator(Context, Method); 5103 } 5104 5105 return false; 5106} 5107 5108/// CheckLiteralOperatorDeclaration - Check whether the declaration 5109/// of this literal operator function is well-formed. If so, returns 5110/// false; otherwise, emits appropriate diagnostics and returns true. 5111bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5112 DeclContext *DC = FnDecl->getDeclContext(); 5113 Decl::Kind Kind = DC->getDeclKind(); 5114 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5115 Kind != Decl::LinkageSpec) { 5116 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5117 << FnDecl->getDeclName(); 5118 return true; 5119 } 5120 5121 bool Valid = false; 5122 5123 // template <char...> type operator "" name() is the only valid template 5124 // signature, and the only valid signature with no parameters. 5125 if (FnDecl->param_size() == 0) { 5126 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5127 // Must have only one template parameter 5128 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5129 if (Params->size() == 1) { 5130 NonTypeTemplateParmDecl *PmDecl = 5131 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5132 5133 // The template parameter must be a char parameter pack. 5134 // FIXME: This test will always fail because non-type parameter packs 5135 // have not been implemented. 5136 if (PmDecl && PmDecl->isTemplateParameterPack() && 5137 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5138 Valid = true; 5139 } 5140 } 5141 } else { 5142 // Check the first parameter 5143 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5144 5145 QualType T = (*Param)->getType(); 5146 5147 // unsigned long long int, long double, and any character type are allowed 5148 // as the only parameters. 5149 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5150 Context.hasSameType(T, Context.LongDoubleTy) || 5151 Context.hasSameType(T, Context.CharTy) || 5152 Context.hasSameType(T, Context.WCharTy) || 5153 Context.hasSameType(T, Context.Char16Ty) || 5154 Context.hasSameType(T, Context.Char32Ty)) { 5155 if (++Param == FnDecl->param_end()) 5156 Valid = true; 5157 goto FinishedParams; 5158 } 5159 5160 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5161 const PointerType *PT = T->getAs<PointerType>(); 5162 if (!PT) 5163 goto FinishedParams; 5164 T = PT->getPointeeType(); 5165 if (!T.isConstQualified()) 5166 goto FinishedParams; 5167 T = T.getUnqualifiedType(); 5168 5169 // Move on to the second parameter; 5170 ++Param; 5171 5172 // If there is no second parameter, the first must be a const char * 5173 if (Param == FnDecl->param_end()) { 5174 if (Context.hasSameType(T, Context.CharTy)) 5175 Valid = true; 5176 goto FinishedParams; 5177 } 5178 5179 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5180 // are allowed as the first parameter to a two-parameter function 5181 if (!(Context.hasSameType(T, Context.CharTy) || 5182 Context.hasSameType(T, Context.WCharTy) || 5183 Context.hasSameType(T, Context.Char16Ty) || 5184 Context.hasSameType(T, Context.Char32Ty))) 5185 goto FinishedParams; 5186 5187 // The second and final parameter must be an std::size_t 5188 T = (*Param)->getType().getUnqualifiedType(); 5189 if (Context.hasSameType(T, Context.getSizeType()) && 5190 ++Param == FnDecl->param_end()) 5191 Valid = true; 5192 } 5193 5194 // FIXME: This diagnostic is absolutely terrible. 5195FinishedParams: 5196 if (!Valid) { 5197 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5198 << FnDecl->getDeclName(); 5199 return true; 5200 } 5201 5202 return false; 5203} 5204 5205/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5206/// linkage specification, including the language and (if present) 5207/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5208/// the location of the language string literal, which is provided 5209/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5210/// the '{' brace. Otherwise, this linkage specification does not 5211/// have any braces. 5212Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5213 SourceLocation ExternLoc, 5214 SourceLocation LangLoc, 5215 const char *Lang, 5216 unsigned StrSize, 5217 SourceLocation LBraceLoc) { 5218 LinkageSpecDecl::LanguageIDs Language; 5219 if (strncmp(Lang, "\"C\"", StrSize) == 0) 5220 Language = LinkageSpecDecl::lang_c; 5221 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 5222 Language = LinkageSpecDecl::lang_cxx; 5223 else { 5224 Diag(LangLoc, diag::err_bad_language); 5225 return DeclPtrTy(); 5226 } 5227 5228 // FIXME: Add all the various semantics of linkage specifications 5229 5230 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5231 LangLoc, Language, 5232 LBraceLoc.isValid()); 5233 CurContext->addDecl(D); 5234 PushDeclContext(S, D); 5235 return DeclPtrTy::make(D); 5236} 5237 5238/// ActOnFinishLinkageSpecification - Completely the definition of 5239/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5240/// valid, it's the position of the closing '}' brace in a linkage 5241/// specification that uses braces. 5242Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5243 DeclPtrTy LinkageSpec, 5244 SourceLocation RBraceLoc) { 5245 if (LinkageSpec) 5246 PopDeclContext(); 5247 return LinkageSpec; 5248} 5249 5250/// \brief Perform semantic analysis for the variable declaration that 5251/// occurs within a C++ catch clause, returning the newly-created 5252/// variable. 5253VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5254 TypeSourceInfo *TInfo, 5255 IdentifierInfo *Name, 5256 SourceLocation Loc, 5257 SourceRange Range) { 5258 bool Invalid = false; 5259 5260 // Arrays and functions decay. 5261 if (ExDeclType->isArrayType()) 5262 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5263 else if (ExDeclType->isFunctionType()) 5264 ExDeclType = Context.getPointerType(ExDeclType); 5265 5266 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5267 // The exception-declaration shall not denote a pointer or reference to an 5268 // incomplete type, other than [cv] void*. 5269 // N2844 forbids rvalue references. 5270 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5271 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5272 Invalid = true; 5273 } 5274 5275 // GCC allows catching pointers and references to incomplete types 5276 // as an extension; so do we, but we warn by default. 5277 5278 QualType BaseType = ExDeclType; 5279 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5280 unsigned DK = diag::err_catch_incomplete; 5281 bool IncompleteCatchIsInvalid = true; 5282 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5283 BaseType = Ptr->getPointeeType(); 5284 Mode = 1; 5285 DK = diag::ext_catch_incomplete_ptr; 5286 IncompleteCatchIsInvalid = false; 5287 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5288 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5289 BaseType = Ref->getPointeeType(); 5290 Mode = 2; 5291 DK = diag::ext_catch_incomplete_ref; 5292 IncompleteCatchIsInvalid = false; 5293 } 5294 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5295 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5296 IncompleteCatchIsInvalid) 5297 Invalid = true; 5298 5299 if (!Invalid && !ExDeclType->isDependentType() && 5300 RequireNonAbstractType(Loc, ExDeclType, 5301 diag::err_abstract_type_in_decl, 5302 AbstractVariableType)) 5303 Invalid = true; 5304 5305 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5306 Name, ExDeclType, TInfo, VarDecl::None); 5307 5308 if (!Invalid) { 5309 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5310 // C++ [except.handle]p16: 5311 // The object declared in an exception-declaration or, if the 5312 // exception-declaration does not specify a name, a temporary (12.2) is 5313 // copy-initialized (8.5) from the exception object. [...] 5314 // The object is destroyed when the handler exits, after the destruction 5315 // of any automatic objects initialized within the handler. 5316 // 5317 // We just pretend to initialize the object with itself, then make sure 5318 // it can be destroyed later. 5319 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5320 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5321 Loc, ExDeclType, 0); 5322 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5323 SourceLocation()); 5324 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5325 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5326 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5327 if (Result.isInvalid()) 5328 Invalid = true; 5329 else 5330 FinalizeVarWithDestructor(ExDecl, RecordTy); 5331 } 5332 } 5333 5334 if (Invalid) 5335 ExDecl->setInvalidDecl(); 5336 5337 return ExDecl; 5338} 5339 5340/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5341/// handler. 5342Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5343 TypeSourceInfo *TInfo = 0; 5344 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5345 5346 bool Invalid = D.isInvalidType(); 5347 IdentifierInfo *II = D.getIdentifier(); 5348 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 5349 // The scope should be freshly made just for us. There is just no way 5350 // it contains any previous declaration. 5351 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5352 if (PrevDecl->isTemplateParameter()) { 5353 // Maybe we will complain about the shadowed template parameter. 5354 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5355 } 5356 } 5357 5358 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5359 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5360 << D.getCXXScopeSpec().getRange(); 5361 Invalid = true; 5362 } 5363 5364 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5365 D.getIdentifier(), 5366 D.getIdentifierLoc(), 5367 D.getDeclSpec().getSourceRange()); 5368 5369 if (Invalid) 5370 ExDecl->setInvalidDecl(); 5371 5372 // Add the exception declaration into this scope. 5373 if (II) 5374 PushOnScopeChains(ExDecl, S); 5375 else 5376 CurContext->addDecl(ExDecl); 5377 5378 ProcessDeclAttributes(S, ExDecl, D); 5379 return DeclPtrTy::make(ExDecl); 5380} 5381 5382Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5383 ExprArg assertexpr, 5384 ExprArg assertmessageexpr) { 5385 Expr *AssertExpr = (Expr *)assertexpr.get(); 5386 StringLiteral *AssertMessage = 5387 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5388 5389 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5390 llvm::APSInt Value(32); 5391 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5392 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5393 AssertExpr->getSourceRange(); 5394 return DeclPtrTy(); 5395 } 5396 5397 if (Value == 0) { 5398 Diag(AssertLoc, diag::err_static_assert_failed) 5399 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5400 } 5401 } 5402 5403 assertexpr.release(); 5404 assertmessageexpr.release(); 5405 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5406 AssertExpr, AssertMessage); 5407 5408 CurContext->addDecl(Decl); 5409 return DeclPtrTy::make(Decl); 5410} 5411 5412/// \brief Perform semantic analysis of the given friend type declaration. 5413/// 5414/// \returns A friend declaration that. 5415FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 5416 TypeSourceInfo *TSInfo) { 5417 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 5418 5419 QualType T = TSInfo->getType(); 5420 SourceRange TypeRange = TSInfo->getTypeLoc().getSourceRange(); 5421 5422 if (!getLangOptions().CPlusPlus0x) { 5423 // C++03 [class.friend]p2: 5424 // An elaborated-type-specifier shall be used in a friend declaration 5425 // for a class.* 5426 // 5427 // * The class-key of the elaborated-type-specifier is required. 5428 if (!ActiveTemplateInstantiations.empty()) { 5429 // Do not complain about the form of friend template types during 5430 // template instantiation; we will already have complained when the 5431 // template was declared. 5432 } else if (!T->isElaboratedTypeSpecifier()) { 5433 // If we evaluated the type to a record type, suggest putting 5434 // a tag in front. 5435 if (const RecordType *RT = T->getAs<RecordType>()) { 5436 RecordDecl *RD = RT->getDecl(); 5437 5438 std::string InsertionText = std::string(" ") + RD->getKindName(); 5439 5440 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 5441 << (unsigned) RD->getTagKind() 5442 << T 5443 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 5444 InsertionText); 5445 } else { 5446 Diag(FriendLoc, diag::ext_nonclass_type_friend) 5447 << T 5448 << SourceRange(FriendLoc, TypeRange.getEnd()); 5449 } 5450 } else if (T->getAs<EnumType>()) { 5451 Diag(FriendLoc, diag::ext_enum_friend) 5452 << T 5453 << SourceRange(FriendLoc, TypeRange.getEnd()); 5454 } 5455 } 5456 5457 // C++0x [class.friend]p3: 5458 // If the type specifier in a friend declaration designates a (possibly 5459 // cv-qualified) class type, that class is declared as a friend; otherwise, 5460 // the friend declaration is ignored. 5461 5462 // FIXME: C++0x has some syntactic restrictions on friend type declarations 5463 // in [class.friend]p3 that we do not implement. 5464 5465 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 5466} 5467 5468/// Handle a friend type declaration. This works in tandem with 5469/// ActOnTag. 5470/// 5471/// Notes on friend class templates: 5472/// 5473/// We generally treat friend class declarations as if they were 5474/// declaring a class. So, for example, the elaborated type specifier 5475/// in a friend declaration is required to obey the restrictions of a 5476/// class-head (i.e. no typedefs in the scope chain), template 5477/// parameters are required to match up with simple template-ids, &c. 5478/// However, unlike when declaring a template specialization, it's 5479/// okay to refer to a template specialization without an empty 5480/// template parameter declaration, e.g. 5481/// friend class A<T>::B<unsigned>; 5482/// We permit this as a special case; if there are any template 5483/// parameters present at all, require proper matching, i.e. 5484/// template <> template <class T> friend class A<int>::B; 5485Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5486 MultiTemplateParamsArg TempParams) { 5487 SourceLocation Loc = DS.getSourceRange().getBegin(); 5488 5489 assert(DS.isFriendSpecified()); 5490 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5491 5492 // Try to convert the decl specifier to a type. This works for 5493 // friend templates because ActOnTag never produces a ClassTemplateDecl 5494 // for a TUK_Friend. 5495 Declarator TheDeclarator(DS, Declarator::MemberContext); 5496 TypeSourceInfo *TSI; 5497 QualType T = GetTypeForDeclarator(TheDeclarator, S, &TSI); 5498 if (TheDeclarator.isInvalidType()) 5499 return DeclPtrTy(); 5500 5501 if (!TSI) 5502 TSI = Context.getTrivialTypeSourceInfo(T, DS.getSourceRange().getBegin()); 5503 5504 // This is definitely an error in C++98. It's probably meant to 5505 // be forbidden in C++0x, too, but the specification is just 5506 // poorly written. 5507 // 5508 // The problem is with declarations like the following: 5509 // template <T> friend A<T>::foo; 5510 // where deciding whether a class C is a friend or not now hinges 5511 // on whether there exists an instantiation of A that causes 5512 // 'foo' to equal C. There are restrictions on class-heads 5513 // (which we declare (by fiat) elaborated friend declarations to 5514 // be) that makes this tractable. 5515 // 5516 // FIXME: handle "template <> friend class A<T>;", which 5517 // is possibly well-formed? Who even knows? 5518 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5519 Diag(Loc, diag::err_tagless_friend_type_template) 5520 << DS.getSourceRange(); 5521 return DeclPtrTy(); 5522 } 5523 5524 // C++98 [class.friend]p1: A friend of a class is a function 5525 // or class that is not a member of the class . . . 5526 // This is fixed in DR77, which just barely didn't make the C++03 5527 // deadline. It's also a very silly restriction that seriously 5528 // affects inner classes and which nobody else seems to implement; 5529 // thus we never diagnose it, not even in -pedantic. 5530 // 5531 // But note that we could warn about it: it's always useless to 5532 // friend one of your own members (it's not, however, worthless to 5533 // friend a member of an arbitrary specialization of your template). 5534 5535 Decl *D; 5536 if (unsigned NumTempParamLists = TempParams.size()) 5537 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5538 NumTempParamLists, 5539 (TemplateParameterList**) TempParams.release(), 5540 TSI, 5541 DS.getFriendSpecLoc()); 5542 else 5543 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5544 5545 if (!D) 5546 return DeclPtrTy(); 5547 5548 D->setAccess(AS_public); 5549 CurContext->addDecl(D); 5550 5551 return DeclPtrTy::make(D); 5552} 5553 5554Sema::DeclPtrTy 5555Sema::ActOnFriendFunctionDecl(Scope *S, 5556 Declarator &D, 5557 bool IsDefinition, 5558 MultiTemplateParamsArg TemplateParams) { 5559 const DeclSpec &DS = D.getDeclSpec(); 5560 5561 assert(DS.isFriendSpecified()); 5562 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5563 5564 SourceLocation Loc = D.getIdentifierLoc(); 5565 TypeSourceInfo *TInfo = 0; 5566 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5567 5568 // C++ [class.friend]p1 5569 // A friend of a class is a function or class.... 5570 // Note that this sees through typedefs, which is intended. 5571 // It *doesn't* see through dependent types, which is correct 5572 // according to [temp.arg.type]p3: 5573 // If a declaration acquires a function type through a 5574 // type dependent on a template-parameter and this causes 5575 // a declaration that does not use the syntactic form of a 5576 // function declarator to have a function type, the program 5577 // is ill-formed. 5578 if (!T->isFunctionType()) { 5579 Diag(Loc, diag::err_unexpected_friend); 5580 5581 // It might be worthwhile to try to recover by creating an 5582 // appropriate declaration. 5583 return DeclPtrTy(); 5584 } 5585 5586 // C++ [namespace.memdef]p3 5587 // - If a friend declaration in a non-local class first declares a 5588 // class or function, the friend class or function is a member 5589 // of the innermost enclosing namespace. 5590 // - The name of the friend is not found by simple name lookup 5591 // until a matching declaration is provided in that namespace 5592 // scope (either before or after the class declaration granting 5593 // friendship). 5594 // - If a friend function is called, its name may be found by the 5595 // name lookup that considers functions from namespaces and 5596 // classes associated with the types of the function arguments. 5597 // - When looking for a prior declaration of a class or a function 5598 // declared as a friend, scopes outside the innermost enclosing 5599 // namespace scope are not considered. 5600 5601 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5602 DeclarationName Name = GetNameForDeclarator(D); 5603 assert(Name); 5604 5605 // The context we found the declaration in, or in which we should 5606 // create the declaration. 5607 DeclContext *DC; 5608 5609 // FIXME: handle local classes 5610 5611 // Recover from invalid scope qualifiers as if they just weren't there. 5612 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5613 ForRedeclaration); 5614 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5615 // FIXME: RequireCompleteDeclContext 5616 DC = computeDeclContext(ScopeQual); 5617 5618 // FIXME: handle dependent contexts 5619 if (!DC) return DeclPtrTy(); 5620 5621 LookupQualifiedName(Previous, DC); 5622 5623 // If searching in that context implicitly found a declaration in 5624 // a different context, treat it like it wasn't found at all. 5625 // TODO: better diagnostics for this case. Suggesting the right 5626 // qualified scope would be nice... 5627 // FIXME: getRepresentativeDecl() is not right here at all 5628 if (Previous.empty() || 5629 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5630 D.setInvalidType(); 5631 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5632 return DeclPtrTy(); 5633 } 5634 5635 // C++ [class.friend]p1: A friend of a class is a function or 5636 // class that is not a member of the class . . . 5637 if (DC->Equals(CurContext)) 5638 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5639 5640 // Otherwise walk out to the nearest namespace scope looking for matches. 5641 } else { 5642 // TODO: handle local class contexts. 5643 5644 DC = CurContext; 5645 while (true) { 5646 // Skip class contexts. If someone can cite chapter and verse 5647 // for this behavior, that would be nice --- it's what GCC and 5648 // EDG do, and it seems like a reasonable intent, but the spec 5649 // really only says that checks for unqualified existing 5650 // declarations should stop at the nearest enclosing namespace, 5651 // not that they should only consider the nearest enclosing 5652 // namespace. 5653 while (DC->isRecord()) 5654 DC = DC->getParent(); 5655 5656 LookupQualifiedName(Previous, DC); 5657 5658 // TODO: decide what we think about using declarations. 5659 if (!Previous.empty()) 5660 break; 5661 5662 if (DC->isFileContext()) break; 5663 DC = DC->getParent(); 5664 } 5665 5666 // C++ [class.friend]p1: A friend of a class is a function or 5667 // class that is not a member of the class . . . 5668 // C++0x changes this for both friend types and functions. 5669 // Most C++ 98 compilers do seem to give an error here, so 5670 // we do, too. 5671 if (!Previous.empty() && DC->Equals(CurContext) 5672 && !getLangOptions().CPlusPlus0x) 5673 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5674 } 5675 5676 if (DC->isFileContext()) { 5677 // This implies that it has to be an operator or function. 5678 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5679 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5680 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5681 Diag(Loc, diag::err_introducing_special_friend) << 5682 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5683 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5684 return DeclPtrTy(); 5685 } 5686 } 5687 5688 bool Redeclaration = false; 5689 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5690 move(TemplateParams), 5691 IsDefinition, 5692 Redeclaration); 5693 if (!ND) return DeclPtrTy(); 5694 5695 assert(ND->getDeclContext() == DC); 5696 assert(ND->getLexicalDeclContext() == CurContext); 5697 5698 // Add the function declaration to the appropriate lookup tables, 5699 // adjusting the redeclarations list as necessary. We don't 5700 // want to do this yet if the friending class is dependent. 5701 // 5702 // Also update the scope-based lookup if the target context's 5703 // lookup context is in lexical scope. 5704 if (!CurContext->isDependentContext()) { 5705 DC = DC->getLookupContext(); 5706 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5707 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5708 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5709 } 5710 5711 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5712 D.getIdentifierLoc(), ND, 5713 DS.getFriendSpecLoc()); 5714 FrD->setAccess(AS_public); 5715 CurContext->addDecl(FrD); 5716 5717 return DeclPtrTy::make(ND); 5718} 5719 5720void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5721 AdjustDeclIfTemplate(dcl); 5722 5723 Decl *Dcl = dcl.getAs<Decl>(); 5724 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5725 if (!Fn) { 5726 Diag(DelLoc, diag::err_deleted_non_function); 5727 return; 5728 } 5729 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5730 Diag(DelLoc, diag::err_deleted_decl_not_first); 5731 Diag(Prev->getLocation(), diag::note_previous_declaration); 5732 // If the declaration wasn't the first, we delete the function anyway for 5733 // recovery. 5734 } 5735 Fn->setDeleted(); 5736} 5737 5738static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5739 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5740 ++CI) { 5741 Stmt *SubStmt = *CI; 5742 if (!SubStmt) 5743 continue; 5744 if (isa<ReturnStmt>(SubStmt)) 5745 Self.Diag(SubStmt->getSourceRange().getBegin(), 5746 diag::err_return_in_constructor_handler); 5747 if (!isa<Expr>(SubStmt)) 5748 SearchForReturnInStmt(Self, SubStmt); 5749 } 5750} 5751 5752void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5753 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5754 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5755 SearchForReturnInStmt(*this, Handler); 5756 } 5757} 5758 5759bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5760 const CXXMethodDecl *Old) { 5761 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5762 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5763 5764 if (Context.hasSameType(NewTy, OldTy) || 5765 NewTy->isDependentType() || OldTy->isDependentType()) 5766 return false; 5767 5768 // Check if the return types are covariant 5769 QualType NewClassTy, OldClassTy; 5770 5771 /// Both types must be pointers or references to classes. 5772 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5773 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5774 NewClassTy = NewPT->getPointeeType(); 5775 OldClassTy = OldPT->getPointeeType(); 5776 } 5777 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5778 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5779 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5780 NewClassTy = NewRT->getPointeeType(); 5781 OldClassTy = OldRT->getPointeeType(); 5782 } 5783 } 5784 } 5785 5786 // The return types aren't either both pointers or references to a class type. 5787 if (NewClassTy.isNull()) { 5788 Diag(New->getLocation(), 5789 diag::err_different_return_type_for_overriding_virtual_function) 5790 << New->getDeclName() << NewTy << OldTy; 5791 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5792 5793 return true; 5794 } 5795 5796 // C++ [class.virtual]p6: 5797 // If the return type of D::f differs from the return type of B::f, the 5798 // class type in the return type of D::f shall be complete at the point of 5799 // declaration of D::f or shall be the class type D. 5800 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5801 if (!RT->isBeingDefined() && 5802 RequireCompleteType(New->getLocation(), NewClassTy, 5803 PDiag(diag::err_covariant_return_incomplete) 5804 << New->getDeclName())) 5805 return true; 5806 } 5807 5808 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5809 // Check if the new class derives from the old class. 5810 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5811 Diag(New->getLocation(), 5812 diag::err_covariant_return_not_derived) 5813 << New->getDeclName() << NewTy << OldTy; 5814 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5815 return true; 5816 } 5817 5818 // Check if we the conversion from derived to base is valid. 5819 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5820 diag::err_covariant_return_inaccessible_base, 5821 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5822 // FIXME: Should this point to the return type? 5823 New->getLocation(), SourceRange(), New->getDeclName())) { 5824 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5825 return true; 5826 } 5827 } 5828 5829 // The qualifiers of the return types must be the same. 5830 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5831 Diag(New->getLocation(), 5832 diag::err_covariant_return_type_different_qualifications) 5833 << New->getDeclName() << NewTy << OldTy; 5834 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5835 return true; 5836 }; 5837 5838 5839 // The new class type must have the same or less qualifiers as the old type. 5840 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5841 Diag(New->getLocation(), 5842 diag::err_covariant_return_type_class_type_more_qualified) 5843 << New->getDeclName() << NewTy << OldTy; 5844 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5845 return true; 5846 }; 5847 5848 return false; 5849} 5850 5851bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5852 const CXXMethodDecl *Old) 5853{ 5854 if (Old->hasAttr<FinalAttr>()) { 5855 Diag(New->getLocation(), diag::err_final_function_overridden) 5856 << New->getDeclName(); 5857 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5858 return true; 5859 } 5860 5861 return false; 5862} 5863 5864/// \brief Mark the given method pure. 5865/// 5866/// \param Method the method to be marked pure. 5867/// 5868/// \param InitRange the source range that covers the "0" initializer. 5869bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5870 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5871 Method->setPure(); 5872 5873 // A class is abstract if at least one function is pure virtual. 5874 Method->getParent()->setAbstract(true); 5875 return false; 5876 } 5877 5878 if (!Method->isInvalidDecl()) 5879 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5880 << Method->getDeclName() << InitRange; 5881 return true; 5882} 5883 5884/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5885/// an initializer for the out-of-line declaration 'Dcl'. The scope 5886/// is a fresh scope pushed for just this purpose. 5887/// 5888/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5889/// static data member of class X, names should be looked up in the scope of 5890/// class X. 5891void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5892 // If there is no declaration, there was an error parsing it. 5893 Decl *D = Dcl.getAs<Decl>(); 5894 if (D == 0) return; 5895 5896 // We should only get called for declarations with scope specifiers, like: 5897 // int foo::bar; 5898 assert(D->isOutOfLine()); 5899 EnterDeclaratorContext(S, D->getDeclContext()); 5900} 5901 5902/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5903/// initializer for the out-of-line declaration 'Dcl'. 5904void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5905 // If there is no declaration, there was an error parsing it. 5906 Decl *D = Dcl.getAs<Decl>(); 5907 if (D == 0) return; 5908 5909 assert(D->isOutOfLine()); 5910 ExitDeclaratorContext(S); 5911} 5912 5913/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5914/// C++ if/switch/while/for statement. 5915/// e.g: "if (int x = f()) {...}" 5916Action::DeclResult 5917Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5918 // C++ 6.4p2: 5919 // The declarator shall not specify a function or an array. 5920 // The type-specifier-seq shall not contain typedef and shall not declare a 5921 // new class or enumeration. 5922 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5923 "Parser allowed 'typedef' as storage class of condition decl."); 5924 5925 TypeSourceInfo *TInfo = 0; 5926 TagDecl *OwnedTag = 0; 5927 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5928 5929 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5930 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5931 // would be created and CXXConditionDeclExpr wants a VarDecl. 5932 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5933 << D.getSourceRange(); 5934 return DeclResult(); 5935 } else if (OwnedTag && OwnedTag->isDefinition()) { 5936 // The type-specifier-seq shall not declare a new class or enumeration. 5937 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5938 } 5939 5940 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5941 if (!Dcl) 5942 return DeclResult(); 5943 5944 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5945 VD->setDeclaredInCondition(true); 5946 return Dcl; 5947} 5948 5949static bool needsVtable(CXXMethodDecl *MD, ASTContext &Context) { 5950 // Ignore dependent types. 5951 if (MD->isDependentContext()) 5952 return false; 5953 5954 // Ignore declarations that are not definitions. 5955 if (!MD->isThisDeclarationADefinition()) 5956 return false; 5957 5958 CXXRecordDecl *RD = MD->getParent(); 5959 5960 // Ignore classes without a vtable. 5961 if (!RD->isDynamicClass()) 5962 return false; 5963 5964 switch (MD->getParent()->getTemplateSpecializationKind()) { 5965 case TSK_Undeclared: 5966 case TSK_ExplicitSpecialization: 5967 // Classes that aren't instantiations of templates don't need their 5968 // virtual methods marked until we see the definition of the key 5969 // function. 5970 break; 5971 5972 case TSK_ImplicitInstantiation: 5973 // This is a constructor of a class template; mark all of the virtual 5974 // members as referenced to ensure that they get instantiatied. 5975 if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) 5976 return true; 5977 break; 5978 5979 case TSK_ExplicitInstantiationDeclaration: 5980 return false; 5981 5982 case TSK_ExplicitInstantiationDefinition: 5983 // This is method of a explicit instantiation; mark all of the virtual 5984 // members as referenced to ensure that they get instantiatied. 5985 return true; 5986 } 5987 5988 // Consider only out-of-line definitions of member functions. When we see 5989 // an inline definition, it's too early to compute the key function. 5990 if (!MD->isOutOfLine()) 5991 return false; 5992 5993 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5994 5995 // If there is no key function, we will need a copy of the vtable. 5996 if (!KeyFunction) 5997 return true; 5998 5999 // If this is the key function, we need to mark virtual members. 6000 if (KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 6001 return true; 6002 6003 return false; 6004} 6005 6006void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 6007 CXXMethodDecl *MD) { 6008 CXXRecordDecl *RD = MD->getParent(); 6009 6010 // We will need to mark all of the virtual members as referenced to build the 6011 // vtable. 6012 if (!needsVtable(MD, Context)) 6013 return; 6014 6015 TemplateSpecializationKind kind = RD->getTemplateSpecializationKind(); 6016 if (kind == TSK_ImplicitInstantiation) 6017 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 6018 else 6019 MarkVirtualMembersReferenced(Loc, RD); 6020} 6021 6022bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 6023 if (ClassesWithUnmarkedVirtualMembers.empty()) 6024 return false; 6025 6026 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 6027 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 6028 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 6029 ClassesWithUnmarkedVirtualMembers.pop_back(); 6030 MarkVirtualMembersReferenced(Loc, RD); 6031 } 6032 6033 return true; 6034} 6035 6036void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6037 const CXXRecordDecl *RD) { 6038 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6039 e = RD->method_end(); i != e; ++i) { 6040 CXXMethodDecl *MD = *i; 6041 6042 // C++ [basic.def.odr]p2: 6043 // [...] A virtual member function is used if it is not pure. [...] 6044 if (MD->isVirtual() && !MD->isPure()) 6045 MarkDeclarationReferenced(Loc, MD); 6046 } 6047 6048 // Only classes that have virtual bases need a VTT. 6049 if (RD->getNumVBases() == 0) 6050 return; 6051 6052 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6053 e = RD->bases_end(); i != e; ++i) { 6054 const CXXRecordDecl *Base = 6055 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6056 if (i->isVirtual()) 6057 continue; 6058 if (Base->getNumVBases() == 0) 6059 continue; 6060 MarkVirtualMembersReferenced(Loc, Base); 6061 } 6062} 6063