SemaDeclCXX.cpp revision 201361
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 the parameter doesn't have an identifier then the location 274 // points to the '=' which means that the fixit hint won't remove any 275 // extra spaces between the type and the '='. 276 SourceLocation Begin = NewParam->getLocation(); 277 if (NewParam->getIdentifier()) 278 Begin = PP.getLocForEndOfToken(Begin); 279 280 Diag(NewParam->getLocation(), 281 diag::err_param_default_argument_redefinition) 282 << NewParam->getDefaultArgRange() 283 << CodeModificationHint::CreateRemoval(SourceRange(Begin, 284 NewParam->getLocEnd())); 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 if (OldParam->hasUninstantiatedDefaultArg()) 302 NewParam->setUninstantiatedDefaultArg( 303 OldParam->getUninstantiatedDefaultArg()); 304 else 305 NewParam->setDefaultArg(OldParam->getDefaultArg()); 306 } else if (NewParam->hasDefaultArg()) { 307 if (New->getDescribedFunctionTemplate()) { 308 // Paragraph 4, quoted above, only applies to non-template functions. 309 Diag(NewParam->getLocation(), 310 diag::err_param_default_argument_template_redecl) 311 << NewParam->getDefaultArgRange(); 312 Diag(Old->getLocation(), diag::note_template_prev_declaration) 313 << false; 314 } else if (New->getTemplateSpecializationKind() 315 != TSK_ImplicitInstantiation && 316 New->getTemplateSpecializationKind() != TSK_Undeclared) { 317 // C++ [temp.expr.spec]p21: 318 // Default function arguments shall not be specified in a declaration 319 // or a definition for one of the following explicit specializations: 320 // - the explicit specialization of a function template; 321 // - the explicit specialization of a member function template; 322 // - the explicit specialization of a member function of a class 323 // template where the class template specialization to which the 324 // member function specialization belongs is implicitly 325 // instantiated. 326 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 327 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 328 << New->getDeclName() 329 << NewParam->getDefaultArgRange(); 330 } else if (New->getDeclContext()->isDependentContext()) { 331 // C++ [dcl.fct.default]p6 (DR217): 332 // Default arguments for a member function of a class template shall 333 // be specified on the initial declaration of the member function 334 // within the class template. 335 // 336 // Reading the tea leaves a bit in DR217 and its reference to DR205 337 // leads me to the conclusion that one cannot add default function 338 // arguments for an out-of-line definition of a member function of a 339 // dependent type. 340 int WhichKind = 2; 341 if (CXXRecordDecl *Record 342 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 343 if (Record->getDescribedClassTemplate()) 344 WhichKind = 0; 345 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 346 WhichKind = 1; 347 else 348 WhichKind = 2; 349 } 350 351 Diag(NewParam->getLocation(), 352 diag::err_param_default_argument_member_template_redecl) 353 << WhichKind 354 << NewParam->getDefaultArgRange(); 355 } 356 } 357 } 358 359 if (CheckEquivalentExceptionSpec( 360 Old->getType()->getAs<FunctionProtoType>(), Old->getLocation(), 361 New->getType()->getAs<FunctionProtoType>(), New->getLocation())) 362 Invalid = true; 363 364 return Invalid; 365} 366 367/// CheckCXXDefaultArguments - Verify that the default arguments for a 368/// function declaration are well-formed according to C++ 369/// [dcl.fct.default]. 370void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 371 unsigned NumParams = FD->getNumParams(); 372 unsigned p; 373 374 // Find first parameter with a default argument 375 for (p = 0; p < NumParams; ++p) { 376 ParmVarDecl *Param = FD->getParamDecl(p); 377 if (Param->hasDefaultArg()) 378 break; 379 } 380 381 // C++ [dcl.fct.default]p4: 382 // In a given function declaration, all parameters 383 // subsequent to a parameter with a default argument shall 384 // have default arguments supplied in this or previous 385 // declarations. A default argument shall not be redefined 386 // by a later declaration (not even to the same value). 387 unsigned LastMissingDefaultArg = 0; 388 for (; p < NumParams; ++p) { 389 ParmVarDecl *Param = FD->getParamDecl(p); 390 if (!Param->hasDefaultArg()) { 391 if (Param->isInvalidDecl()) 392 /* We already complained about this parameter. */; 393 else if (Param->getIdentifier()) 394 Diag(Param->getLocation(), 395 diag::err_param_default_argument_missing_name) 396 << Param->getIdentifier(); 397 else 398 Diag(Param->getLocation(), 399 diag::err_param_default_argument_missing); 400 401 LastMissingDefaultArg = p; 402 } 403 } 404 405 if (LastMissingDefaultArg > 0) { 406 // Some default arguments were missing. Clear out all of the 407 // default arguments up to (and including) the last missing 408 // default argument, so that we leave the function parameters 409 // in a semantically valid state. 410 for (p = 0; p <= LastMissingDefaultArg; ++p) { 411 ParmVarDecl *Param = FD->getParamDecl(p); 412 if (Param->hasDefaultArg()) { 413 if (!Param->hasUnparsedDefaultArg()) 414 Param->getDefaultArg()->Destroy(Context); 415 Param->setDefaultArg(0); 416 } 417 } 418 } 419} 420 421/// isCurrentClassName - Determine whether the identifier II is the 422/// name of the class type currently being defined. In the case of 423/// nested classes, this will only return true if II is the name of 424/// the innermost class. 425bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 426 const CXXScopeSpec *SS) { 427 CXXRecordDecl *CurDecl; 428 if (SS && SS->isSet() && !SS->isInvalid()) { 429 DeclContext *DC = computeDeclContext(*SS, true); 430 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 431 } else 432 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 433 434 if (CurDecl) 435 return &II == CurDecl->getIdentifier(); 436 else 437 return false; 438} 439 440/// \brief Check the validity of a C++ base class specifier. 441/// 442/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 443/// and returns NULL otherwise. 444CXXBaseSpecifier * 445Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 446 SourceRange SpecifierRange, 447 bool Virtual, AccessSpecifier Access, 448 QualType BaseType, 449 SourceLocation BaseLoc) { 450 // C++ [class.union]p1: 451 // A union shall not have base classes. 452 if (Class->isUnion()) { 453 Diag(Class->getLocation(), diag::err_base_clause_on_union) 454 << SpecifierRange; 455 return 0; 456 } 457 458 if (BaseType->isDependentType()) 459 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 460 Class->getTagKind() == RecordDecl::TK_class, 461 Access, BaseType); 462 463 // Base specifiers must be record types. 464 if (!BaseType->isRecordType()) { 465 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 466 return 0; 467 } 468 469 // C++ [class.union]p1: 470 // A union shall not be used as a base class. 471 if (BaseType->isUnionType()) { 472 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 473 return 0; 474 } 475 476 // C++ [class.derived]p2: 477 // The class-name in a base-specifier shall not be an incompletely 478 // defined class. 479 if (RequireCompleteType(BaseLoc, BaseType, 480 PDiag(diag::err_incomplete_base_class) 481 << SpecifierRange)) 482 return 0; 483 484 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 485 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 486 assert(BaseDecl && "Record type has no declaration"); 487 BaseDecl = BaseDecl->getDefinition(Context); 488 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 489 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 490 assert(CXXBaseDecl && "Base type is not a C++ type"); 491 492 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 493 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 494 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 495 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 496 << BaseType; 497 return 0; 498 } 499 500 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 501 502 // Create the base specifier. 503 // FIXME: Allocate via ASTContext? 504 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 505 Class->getTagKind() == RecordDecl::TK_class, 506 Access, BaseType); 507} 508 509void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 510 const CXXRecordDecl *BaseClass, 511 bool BaseIsVirtual) { 512 // A class with a non-empty base class is not empty. 513 // FIXME: Standard ref? 514 if (!BaseClass->isEmpty()) 515 Class->setEmpty(false); 516 517 // C++ [class.virtual]p1: 518 // A class that [...] inherits a virtual function is called a polymorphic 519 // class. 520 if (BaseClass->isPolymorphic()) 521 Class->setPolymorphic(true); 522 523 // C++ [dcl.init.aggr]p1: 524 // An aggregate is [...] a class with [...] no base classes [...]. 525 Class->setAggregate(false); 526 527 // C++ [class]p4: 528 // A POD-struct is an aggregate class... 529 Class->setPOD(false); 530 531 if (BaseIsVirtual) { 532 // C++ [class.ctor]p5: 533 // A constructor is trivial if its class has no virtual base classes. 534 Class->setHasTrivialConstructor(false); 535 536 // C++ [class.copy]p6: 537 // A copy constructor is trivial if its class has no virtual base classes. 538 Class->setHasTrivialCopyConstructor(false); 539 540 // C++ [class.copy]p11: 541 // A copy assignment operator is trivial if its class has no virtual 542 // base classes. 543 Class->setHasTrivialCopyAssignment(false); 544 545 // C++0x [meta.unary.prop] is_empty: 546 // T is a class type, but not a union type, with ... no virtual base 547 // classes 548 Class->setEmpty(false); 549 } else { 550 // C++ [class.ctor]p5: 551 // A constructor is trivial if all the direct base classes of its 552 // class have trivial constructors. 553 if (!BaseClass->hasTrivialConstructor()) 554 Class->setHasTrivialConstructor(false); 555 556 // C++ [class.copy]p6: 557 // A copy constructor is trivial if all the direct base classes of its 558 // class have trivial copy constructors. 559 if (!BaseClass->hasTrivialCopyConstructor()) 560 Class->setHasTrivialCopyConstructor(false); 561 562 // C++ [class.copy]p11: 563 // A copy assignment operator is trivial if all the direct base classes 564 // of its class have trivial copy assignment operators. 565 if (!BaseClass->hasTrivialCopyAssignment()) 566 Class->setHasTrivialCopyAssignment(false); 567 } 568 569 // C++ [class.ctor]p3: 570 // A destructor is trivial if all the direct base classes of its class 571 // have trivial destructors. 572 if (!BaseClass->hasTrivialDestructor()) 573 Class->setHasTrivialDestructor(false); 574} 575 576/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 577/// one entry in the base class list of a class specifier, for 578/// example: 579/// class foo : public bar, virtual private baz { 580/// 'public bar' and 'virtual private baz' are each base-specifiers. 581Sema::BaseResult 582Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 583 bool Virtual, AccessSpecifier Access, 584 TypeTy *basetype, SourceLocation BaseLoc) { 585 if (!classdecl) 586 return true; 587 588 AdjustDeclIfTemplate(classdecl); 589 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 590 QualType BaseType = GetTypeFromParser(basetype); 591 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 592 Virtual, Access, 593 BaseType, BaseLoc)) 594 return BaseSpec; 595 596 return true; 597} 598 599/// \brief Performs the actual work of attaching the given base class 600/// specifiers to a C++ class. 601bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 602 unsigned NumBases) { 603 if (NumBases == 0) 604 return false; 605 606 // Used to keep track of which base types we have already seen, so 607 // that we can properly diagnose redundant direct base types. Note 608 // that the key is always the unqualified canonical type of the base 609 // class. 610 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 611 612 // Copy non-redundant base specifiers into permanent storage. 613 unsigned NumGoodBases = 0; 614 bool Invalid = false; 615 for (unsigned idx = 0; idx < NumBases; ++idx) { 616 QualType NewBaseType 617 = Context.getCanonicalType(Bases[idx]->getType()); 618 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 619 620 if (KnownBaseTypes[NewBaseType]) { 621 // C++ [class.mi]p3: 622 // A class shall not be specified as a direct base class of a 623 // derived class more than once. 624 Diag(Bases[idx]->getSourceRange().getBegin(), 625 diag::err_duplicate_base_class) 626 << KnownBaseTypes[NewBaseType]->getType() 627 << Bases[idx]->getSourceRange(); 628 629 // Delete the duplicate base class specifier; we're going to 630 // overwrite its pointer later. 631 Context.Deallocate(Bases[idx]); 632 633 Invalid = true; 634 } else { 635 // Okay, add this new base class. 636 KnownBaseTypes[NewBaseType] = Bases[idx]; 637 Bases[NumGoodBases++] = Bases[idx]; 638 } 639 } 640 641 // Attach the remaining base class specifiers to the derived class. 642 Class->setBases(Context, Bases, NumGoodBases); 643 644 // Delete the remaining (good) base class specifiers, since their 645 // data has been copied into the CXXRecordDecl. 646 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 647 Context.Deallocate(Bases[idx]); 648 649 return Invalid; 650} 651 652/// ActOnBaseSpecifiers - Attach the given base specifiers to the 653/// class, after checking whether there are any duplicate base 654/// classes. 655void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 656 unsigned NumBases) { 657 if (!ClassDecl || !Bases || !NumBases) 658 return; 659 660 AdjustDeclIfTemplate(ClassDecl); 661 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 662 (CXXBaseSpecifier**)(Bases), NumBases); 663} 664 665/// \brief Determine whether the type \p Derived is a C++ class that is 666/// derived from the type \p Base. 667bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 668 if (!getLangOptions().CPlusPlus) 669 return false; 670 671 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 672 if (!DerivedRT) 673 return false; 674 675 const RecordType *BaseRT = Base->getAs<RecordType>(); 676 if (!BaseRT) 677 return false; 678 679 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 680 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 681 return DerivedRD->isDerivedFrom(BaseRD); 682} 683 684/// \brief Determine whether the type \p Derived is a C++ class that is 685/// derived from the type \p Base. 686bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 687 if (!getLangOptions().CPlusPlus) 688 return false; 689 690 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 691 if (!DerivedRT) 692 return false; 693 694 const RecordType *BaseRT = Base->getAs<RecordType>(); 695 if (!BaseRT) 696 return false; 697 698 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 699 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 700 return DerivedRD->isDerivedFrom(BaseRD, Paths); 701} 702 703/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 704/// conversion (where Derived and Base are class types) is 705/// well-formed, meaning that the conversion is unambiguous (and 706/// that all of the base classes are accessible). Returns true 707/// and emits a diagnostic if the code is ill-formed, returns false 708/// otherwise. Loc is the location where this routine should point to 709/// if there is an error, and Range is the source range to highlight 710/// if there is an error. 711bool 712Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 713 unsigned InaccessibleBaseID, 714 unsigned AmbigiousBaseConvID, 715 SourceLocation Loc, SourceRange Range, 716 DeclarationName Name) { 717 // First, determine whether the path from Derived to Base is 718 // ambiguous. This is slightly more expensive than checking whether 719 // the Derived to Base conversion exists, because here we need to 720 // explore multiple paths to determine if there is an ambiguity. 721 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 722 /*DetectVirtual=*/false); 723 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 724 assert(DerivationOkay && 725 "Can only be used with a derived-to-base conversion"); 726 (void)DerivationOkay; 727 728 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 729 if (InaccessibleBaseID == 0) 730 return false; 731 // Check that the base class can be accessed. 732 return CheckBaseClassAccess(Derived, Base, InaccessibleBaseID, Paths, Loc, 733 Name); 734 } 735 736 // We know that the derived-to-base conversion is ambiguous, and 737 // we're going to produce a diagnostic. Perform the derived-to-base 738 // search just one more time to compute all of the possible paths so 739 // that we can print them out. This is more expensive than any of 740 // the previous derived-to-base checks we've done, but at this point 741 // performance isn't as much of an issue. 742 Paths.clear(); 743 Paths.setRecordingPaths(true); 744 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 745 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 746 (void)StillOkay; 747 748 // Build up a textual representation of the ambiguous paths, e.g., 749 // D -> B -> A, that will be used to illustrate the ambiguous 750 // conversions in the diagnostic. We only print one of the paths 751 // to each base class subobject. 752 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 753 754 Diag(Loc, AmbigiousBaseConvID) 755 << Derived << Base << PathDisplayStr << Range << Name; 756 return true; 757} 758 759bool 760Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 761 SourceLocation Loc, SourceRange Range, 762 bool IgnoreAccess) { 763 return CheckDerivedToBaseConversion(Derived, Base, 764 IgnoreAccess ? 0 : 765 diag::err_conv_to_inaccessible_base, 766 diag::err_ambiguous_derived_to_base_conv, 767 Loc, Range, DeclarationName()); 768} 769 770 771/// @brief Builds a string representing ambiguous paths from a 772/// specific derived class to different subobjects of the same base 773/// class. 774/// 775/// This function builds a string that can be used in error messages 776/// to show the different paths that one can take through the 777/// inheritance hierarchy to go from the derived class to different 778/// subobjects of a base class. The result looks something like this: 779/// @code 780/// struct D -> struct B -> struct A 781/// struct D -> struct C -> struct A 782/// @endcode 783std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 784 std::string PathDisplayStr; 785 std::set<unsigned> DisplayedPaths; 786 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 787 Path != Paths.end(); ++Path) { 788 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 789 // We haven't displayed a path to this particular base 790 // class subobject yet. 791 PathDisplayStr += "\n "; 792 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 793 for (CXXBasePath::const_iterator Element = Path->begin(); 794 Element != Path->end(); ++Element) 795 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 796 } 797 } 798 799 return PathDisplayStr; 800} 801 802//===----------------------------------------------------------------------===// 803// C++ class member Handling 804//===----------------------------------------------------------------------===// 805 806/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 807/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 808/// bitfield width if there is one and 'InitExpr' specifies the initializer if 809/// any. 810Sema::DeclPtrTy 811Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 812 MultiTemplateParamsArg TemplateParameterLists, 813 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 814 bool Deleted) { 815 const DeclSpec &DS = D.getDeclSpec(); 816 DeclarationName Name = GetNameForDeclarator(D); 817 Expr *BitWidth = static_cast<Expr*>(BW); 818 Expr *Init = static_cast<Expr*>(InitExpr); 819 SourceLocation Loc = D.getIdentifierLoc(); 820 821 bool isFunc = D.isFunctionDeclarator(); 822 823 assert(!DS.isFriendSpecified()); 824 825 // C++ 9.2p6: A member shall not be declared to have automatic storage 826 // duration (auto, register) or with the extern storage-class-specifier. 827 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 828 // data members and cannot be applied to names declared const or static, 829 // and cannot be applied to reference members. 830 switch (DS.getStorageClassSpec()) { 831 case DeclSpec::SCS_unspecified: 832 case DeclSpec::SCS_typedef: 833 case DeclSpec::SCS_static: 834 // FALL THROUGH. 835 break; 836 case DeclSpec::SCS_mutable: 837 if (isFunc) { 838 if (DS.getStorageClassSpecLoc().isValid()) 839 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 840 else 841 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 842 843 // FIXME: It would be nicer if the keyword was ignored only for this 844 // declarator. Otherwise we could get follow-up errors. 845 D.getMutableDeclSpec().ClearStorageClassSpecs(); 846 } else { 847 QualType T = GetTypeForDeclarator(D, S); 848 diag::kind err = static_cast<diag::kind>(0); 849 if (T->isReferenceType()) 850 err = diag::err_mutable_reference; 851 else if (T.isConstQualified()) 852 err = diag::err_mutable_const; 853 if (err != 0) { 854 if (DS.getStorageClassSpecLoc().isValid()) 855 Diag(DS.getStorageClassSpecLoc(), err); 856 else 857 Diag(DS.getThreadSpecLoc(), err); 858 // FIXME: It would be nicer if the keyword was ignored only for this 859 // declarator. Otherwise we could get follow-up errors. 860 D.getMutableDeclSpec().ClearStorageClassSpecs(); 861 } 862 } 863 break; 864 default: 865 if (DS.getStorageClassSpecLoc().isValid()) 866 Diag(DS.getStorageClassSpecLoc(), 867 diag::err_storageclass_invalid_for_member); 868 else 869 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 870 D.getMutableDeclSpec().ClearStorageClassSpecs(); 871 } 872 873 if (!isFunc && 874 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 875 D.getNumTypeObjects() == 0) { 876 // Check also for this case: 877 // 878 // typedef int f(); 879 // f a; 880 // 881 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 882 isFunc = TDType->isFunctionType(); 883 } 884 885 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 886 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 887 !isFunc); 888 889 Decl *Member; 890 if (isInstField) { 891 // FIXME: Check for template parameters! 892 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 893 AS); 894 assert(Member && "HandleField never returns null"); 895 } else { 896 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 897 .getAs<Decl>(); 898 if (!Member) { 899 if (BitWidth) DeleteExpr(BitWidth); 900 return DeclPtrTy(); 901 } 902 903 // Non-instance-fields can't have a bitfield. 904 if (BitWidth) { 905 if (Member->isInvalidDecl()) { 906 // don't emit another diagnostic. 907 } else if (isa<VarDecl>(Member)) { 908 // C++ 9.6p3: A bit-field shall not be a static member. 909 // "static member 'A' cannot be a bit-field" 910 Diag(Loc, diag::err_static_not_bitfield) 911 << Name << BitWidth->getSourceRange(); 912 } else if (isa<TypedefDecl>(Member)) { 913 // "typedef member 'x' cannot be a bit-field" 914 Diag(Loc, diag::err_typedef_not_bitfield) 915 << Name << BitWidth->getSourceRange(); 916 } else { 917 // A function typedef ("typedef int f(); f a;"). 918 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 919 Diag(Loc, diag::err_not_integral_type_bitfield) 920 << Name << cast<ValueDecl>(Member)->getType() 921 << BitWidth->getSourceRange(); 922 } 923 924 DeleteExpr(BitWidth); 925 BitWidth = 0; 926 Member->setInvalidDecl(); 927 } 928 929 Member->setAccess(AS); 930 931 // If we have declared a member function template, set the access of the 932 // templated declaration as well. 933 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 934 FunTmpl->getTemplatedDecl()->setAccess(AS); 935 } 936 937 assert((Name || isInstField) && "No identifier for non-field ?"); 938 939 if (Init) 940 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 941 if (Deleted) // FIXME: Source location is not very good. 942 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 943 944 if (isInstField) { 945 FieldCollector->Add(cast<FieldDecl>(Member)); 946 return DeclPtrTy(); 947 } 948 return DeclPtrTy::make(Member); 949} 950 951/// \brief Find the direct and/or virtual base specifiers that 952/// correspond to the given base type, for use in base initialization 953/// within a constructor. 954static bool FindBaseInitializer(Sema &SemaRef, 955 CXXRecordDecl *ClassDecl, 956 QualType BaseType, 957 const CXXBaseSpecifier *&DirectBaseSpec, 958 const CXXBaseSpecifier *&VirtualBaseSpec) { 959 // First, check for a direct base class. 960 DirectBaseSpec = 0; 961 for (CXXRecordDecl::base_class_const_iterator Base 962 = ClassDecl->bases_begin(); 963 Base != ClassDecl->bases_end(); ++Base) { 964 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 965 // We found a direct base of this type. That's what we're 966 // initializing. 967 DirectBaseSpec = &*Base; 968 break; 969 } 970 } 971 972 // Check for a virtual base class. 973 // FIXME: We might be able to short-circuit this if we know in advance that 974 // there are no virtual bases. 975 VirtualBaseSpec = 0; 976 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 977 // We haven't found a base yet; search the class hierarchy for a 978 // virtual base class. 979 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 980 /*DetectVirtual=*/false); 981 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 982 BaseType, Paths)) { 983 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 984 Path != Paths.end(); ++Path) { 985 if (Path->back().Base->isVirtual()) { 986 VirtualBaseSpec = Path->back().Base; 987 break; 988 } 989 } 990 } 991 } 992 993 return DirectBaseSpec || VirtualBaseSpec; 994} 995 996/// ActOnMemInitializer - Handle a C++ member initializer. 997Sema::MemInitResult 998Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 999 Scope *S, 1000 const CXXScopeSpec &SS, 1001 IdentifierInfo *MemberOrBase, 1002 TypeTy *TemplateTypeTy, 1003 SourceLocation IdLoc, 1004 SourceLocation LParenLoc, 1005 ExprTy **Args, unsigned NumArgs, 1006 SourceLocation *CommaLocs, 1007 SourceLocation RParenLoc) { 1008 if (!ConstructorD) 1009 return true; 1010 1011 AdjustDeclIfTemplate(ConstructorD); 1012 1013 CXXConstructorDecl *Constructor 1014 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1015 if (!Constructor) { 1016 // The user wrote a constructor initializer on a function that is 1017 // not a C++ constructor. Ignore the error for now, because we may 1018 // have more member initializers coming; we'll diagnose it just 1019 // once in ActOnMemInitializers. 1020 return true; 1021 } 1022 1023 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1024 1025 // C++ [class.base.init]p2: 1026 // Names in a mem-initializer-id are looked up in the scope of the 1027 // constructor���s class and, if not found in that scope, are looked 1028 // up in the scope containing the constructor���s 1029 // definition. [Note: if the constructor���s class contains a member 1030 // with the same name as a direct or virtual base class of the 1031 // class, a mem-initializer-id naming the member or base class and 1032 // composed of a single identifier refers to the class member. A 1033 // mem-initializer-id for the hidden base class may be specified 1034 // using a qualified name. ] 1035 if (!SS.getScopeRep() && !TemplateTypeTy) { 1036 // Look for a member, first. 1037 FieldDecl *Member = 0; 1038 DeclContext::lookup_result Result 1039 = ClassDecl->lookup(MemberOrBase); 1040 if (Result.first != Result.second) 1041 Member = dyn_cast<FieldDecl>(*Result.first); 1042 1043 // FIXME: Handle members of an anonymous union. 1044 1045 if (Member) 1046 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1047 LParenLoc, RParenLoc); 1048 } 1049 // It didn't name a member, so see if it names a class. 1050 QualType BaseType; 1051 TypeSourceInfo *TInfo = 0; 1052 1053 if (TemplateTypeTy) { 1054 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1055 } else { 1056 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1057 LookupParsedName(R, S, &SS); 1058 1059 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1060 if (!TyD) { 1061 if (R.isAmbiguous()) return true; 1062 1063 // If no results were found, try to correct typos. 1064 if (R.empty() && 1065 CorrectTypo(R, S, &SS, ClassDecl) && R.isSingleResult()) { 1066 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1067 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1068 // We have found a non-static data member with a similar 1069 // name to what was typed; complain and initialize that 1070 // member. 1071 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1072 << MemberOrBase << true << R.getLookupName() 1073 << CodeModificationHint::CreateReplacement(R.getNameLoc(), 1074 R.getLookupName().getAsString()); 1075 1076 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1077 LParenLoc, RParenLoc); 1078 } 1079 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1080 const CXXBaseSpecifier *DirectBaseSpec; 1081 const CXXBaseSpecifier *VirtualBaseSpec; 1082 if (FindBaseInitializer(*this, ClassDecl, 1083 Context.getTypeDeclType(Type), 1084 DirectBaseSpec, VirtualBaseSpec)) { 1085 // We have found a direct or virtual base class with a 1086 // similar name to what was typed; complain and initialize 1087 // that base class. 1088 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1089 << MemberOrBase << false << R.getLookupName() 1090 << CodeModificationHint::CreateReplacement(R.getNameLoc(), 1091 R.getLookupName().getAsString()); 1092 1093 TyD = Type; 1094 } 1095 } 1096 } 1097 1098 if (!TyD) { 1099 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1100 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1101 return true; 1102 } 1103 } 1104 1105 BaseType = Context.getTypeDeclType(TyD); 1106 if (SS.isSet()) { 1107 NestedNameSpecifier *Qualifier = 1108 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1109 1110 // FIXME: preserve source range information 1111 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1112 } 1113 } 1114 1115 if (!TInfo) 1116 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1117 1118 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1119 LParenLoc, RParenLoc, ClassDecl); 1120} 1121 1122/// Checks an initializer expression for use of uninitialized fields, such as 1123/// containing the field that is being initialized. Returns true if there is an 1124/// uninitialized field was used an updates the SourceLocation parameter; false 1125/// otherwise. 1126static bool InitExprContainsUninitializedFields(const Stmt* S, 1127 const FieldDecl* LhsField, 1128 SourceLocation* L) { 1129 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1130 if (ME) { 1131 const NamedDecl* RhsField = ME->getMemberDecl(); 1132 if (RhsField == LhsField) { 1133 // Initializing a field with itself. Throw a warning. 1134 // But wait; there are exceptions! 1135 // Exception #1: The field may not belong to this record. 1136 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1137 const Expr* base = ME->getBase(); 1138 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1139 // Even though the field matches, it does not belong to this record. 1140 return false; 1141 } 1142 // None of the exceptions triggered; return true to indicate an 1143 // uninitialized field was used. 1144 *L = ME->getMemberLoc(); 1145 return true; 1146 } 1147 } 1148 bool found = false; 1149 for (Stmt::const_child_iterator it = S->child_begin(); 1150 it != S->child_end() && found == false; 1151 ++it) { 1152 if (isa<CallExpr>(S)) { 1153 // Do not descend into function calls or constructors, as the use 1154 // of an uninitialized field may be valid. One would have to inspect 1155 // the contents of the function/ctor to determine if it is safe or not. 1156 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1157 // may be safe, depending on what the function/ctor does. 1158 continue; 1159 } 1160 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1161 } 1162 return found; 1163} 1164 1165Sema::MemInitResult 1166Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1167 unsigned NumArgs, SourceLocation IdLoc, 1168 SourceLocation LParenLoc, 1169 SourceLocation RParenLoc) { 1170 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1171 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1172 ExprTemporaries.clear(); 1173 1174 // Diagnose value-uses of fields to initialize themselves, e.g. 1175 // foo(foo) 1176 // where foo is not also a parameter to the constructor. 1177 // TODO: implement -Wuninitialized and fold this into that framework. 1178 for (unsigned i = 0; i < NumArgs; ++i) { 1179 SourceLocation L; 1180 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1181 // FIXME: Return true in the case when other fields are used before being 1182 // uninitialized. For example, let this field be the i'th field. When 1183 // initializing the i'th field, throw a warning if any of the >= i'th 1184 // fields are used, as they are not yet initialized. 1185 // Right now we are only handling the case where the i'th field uses 1186 // itself in its initializer. 1187 Diag(L, diag::warn_field_is_uninit); 1188 } 1189 } 1190 1191 bool HasDependentArg = false; 1192 for (unsigned i = 0; i < NumArgs; i++) 1193 HasDependentArg |= Args[i]->isTypeDependent(); 1194 1195 CXXConstructorDecl *C = 0; 1196 QualType FieldType = Member->getType(); 1197 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1198 FieldType = Array->getElementType(); 1199 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1200 if (FieldType->isDependentType()) { 1201 // Can't check init for dependent type. 1202 } else if (FieldType->isRecordType()) { 1203 // Member is a record (struct/union/class), so pass the initializer 1204 // arguments down to the record's constructor. 1205 if (!HasDependentArg) { 1206 C = PerformInitializationByConstructor(FieldType, 1207 MultiExprArg(*this, 1208 (void**)Args, 1209 NumArgs), 1210 IdLoc, 1211 SourceRange(IdLoc, RParenLoc), 1212 Member->getDeclName(), 1213 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc), 1214 ConstructorArgs); 1215 1216 if (C) { 1217 // Take over the constructor arguments as our own. 1218 NumArgs = ConstructorArgs.size(); 1219 Args = (Expr **)ConstructorArgs.take(); 1220 } 1221 } 1222 } else if (NumArgs != 1 && NumArgs != 0) { 1223 // The member type is not a record type (or an array of record 1224 // types), so it can be only be default- or copy-initialized. 1225 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 1226 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 1227 } else if (!HasDependentArg) { 1228 Expr *NewExp; 1229 if (NumArgs == 0) { 1230 if (FieldType->isReferenceType()) { 1231 Diag(IdLoc, diag::err_null_intialized_reference_member) 1232 << Member->getDeclName(); 1233 return Diag(Member->getLocation(), diag::note_declared_at); 1234 } 1235 NewExp = new (Context) CXXZeroInitValueExpr(FieldType, IdLoc, RParenLoc); 1236 NumArgs = 1; 1237 } 1238 else 1239 NewExp = (Expr*)Args[0]; 1240 if (!Member->isInvalidDecl() && 1241 PerformCopyInitialization(NewExp, FieldType, AA_Passing)) 1242 return true; 1243 Args[0] = NewExp; 1244 } 1245 1246 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1247 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1248 ExprTemporaries.clear(); 1249 1250 // FIXME: Perform direct initialization of the member. 1251 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1252 C, LParenLoc, (Expr **)Args, 1253 NumArgs, RParenLoc); 1254} 1255 1256Sema::MemInitResult 1257Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1258 Expr **Args, unsigned NumArgs, 1259 SourceLocation LParenLoc, SourceLocation RParenLoc, 1260 CXXRecordDecl *ClassDecl) { 1261 bool HasDependentArg = false; 1262 for (unsigned i = 0; i < NumArgs; i++) 1263 HasDependentArg |= Args[i]->isTypeDependent(); 1264 1265 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1266 if (!BaseType->isDependentType()) { 1267 if (!BaseType->isRecordType()) 1268 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1269 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1270 1271 // C++ [class.base.init]p2: 1272 // [...] Unless the mem-initializer-id names a nonstatic data 1273 // member of the constructor���s class or a direct or virtual base 1274 // of that class, the mem-initializer is ill-formed. A 1275 // mem-initializer-list can initialize a base class using any 1276 // name that denotes that base class type. 1277 1278 // Check for direct and virtual base classes. 1279 const CXXBaseSpecifier *DirectBaseSpec = 0; 1280 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1281 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1282 VirtualBaseSpec); 1283 1284 // C++ [base.class.init]p2: 1285 // If a mem-initializer-id is ambiguous because it designates both 1286 // a direct non-virtual base class and an inherited virtual base 1287 // class, the mem-initializer is ill-formed. 1288 if (DirectBaseSpec && VirtualBaseSpec) 1289 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1290 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1291 // C++ [base.class.init]p2: 1292 // Unless the mem-initializer-id names a nonstatic data membeer of the 1293 // constructor's class ot a direst or virtual base of that class, the 1294 // mem-initializer is ill-formed. 1295 if (!DirectBaseSpec && !VirtualBaseSpec) 1296 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1297 << BaseType << ClassDecl->getNameAsCString() 1298 << BaseTInfo->getTypeLoc().getSourceRange(); 1299 } 1300 1301 CXXConstructorDecl *C = 0; 1302 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1303 if (!BaseType->isDependentType() && !HasDependentArg) { 1304 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 1305 Context.getCanonicalType(BaseType).getUnqualifiedType()); 1306 1307 C = PerformInitializationByConstructor(BaseType, 1308 MultiExprArg(*this, 1309 (void**)Args, NumArgs), 1310 BaseLoc, 1311 SourceRange(BaseLoc, RParenLoc), 1312 Name, 1313 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc), 1314 ConstructorArgs); 1315 if (C) { 1316 // Take over the constructor arguments as our own. 1317 NumArgs = ConstructorArgs.size(); 1318 Args = (Expr **)ConstructorArgs.take(); 1319 } 1320 } 1321 1322 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1323 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1324 ExprTemporaries.clear(); 1325 1326 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, C, 1327 LParenLoc, (Expr **)Args, 1328 NumArgs, RParenLoc); 1329} 1330 1331bool 1332Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1333 CXXBaseOrMemberInitializer **Initializers, 1334 unsigned NumInitializers, 1335 bool IsImplicitConstructor) { 1336 // We need to build the initializer AST according to order of construction 1337 // and not what user specified in the Initializers list. 1338 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1339 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1340 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1341 bool HasDependentBaseInit = false; 1342 bool HadError = false; 1343 1344 for (unsigned i = 0; i < NumInitializers; i++) { 1345 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1346 if (Member->isBaseInitializer()) { 1347 if (Member->getBaseClass()->isDependentType()) 1348 HasDependentBaseInit = true; 1349 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1350 } else { 1351 AllBaseFields[Member->getMember()] = Member; 1352 } 1353 } 1354 1355 if (HasDependentBaseInit) { 1356 // FIXME. This does not preserve the ordering of the initializers. 1357 // Try (with -Wreorder) 1358 // template<class X> struct A {}; 1359 // template<class X> struct B : A<X> { 1360 // B() : x1(10), A<X>() {} 1361 // int x1; 1362 // }; 1363 // B<int> x; 1364 // On seeing one dependent type, we should essentially exit this routine 1365 // while preserving user-declared initializer list. When this routine is 1366 // called during instantiatiation process, this routine will rebuild the 1367 // ordered initializer list correctly. 1368 1369 // If we have a dependent base initialization, we can't determine the 1370 // association between initializers and bases; just dump the known 1371 // initializers into the list, and don't try to deal with other bases. 1372 for (unsigned i = 0; i < NumInitializers; i++) { 1373 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1374 if (Member->isBaseInitializer()) 1375 AllToInit.push_back(Member); 1376 } 1377 } else { 1378 // Push virtual bases before others. 1379 for (CXXRecordDecl::base_class_iterator VBase = 1380 ClassDecl->vbases_begin(), 1381 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1382 if (VBase->getType()->isDependentType()) 1383 continue; 1384 if (CXXBaseOrMemberInitializer *Value 1385 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1386 AllToInit.push_back(Value); 1387 } 1388 else { 1389 CXXRecordDecl *VBaseDecl = 1390 cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1391 assert(VBaseDecl && "SetBaseOrMemberInitializers - VBaseDecl null"); 1392 CXXConstructorDecl *Ctor = VBaseDecl->getDefaultConstructor(Context); 1393 if (!Ctor) { 1394 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1395 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1396 << 0 << VBase->getType(); 1397 Diag(VBaseDecl->getLocation(), diag::note_previous_decl) 1398 << Context.getTagDeclType(VBaseDecl); 1399 HadError = true; 1400 continue; 1401 } 1402 1403 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1404 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1405 Constructor->getLocation(), CtorArgs)) 1406 continue; 1407 1408 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1409 1410 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1411 // subexpression so we can wrap it in a CXXExprWithTemporaries if 1412 // necessary. 1413 // FIXME: Is there any better source-location information we can give? 1414 ExprTemporaries.clear(); 1415 CXXBaseOrMemberInitializer *Member = 1416 new (Context) CXXBaseOrMemberInitializer(Context, 1417 Context.getTrivialTypeSourceInfo(VBase->getType(), 1418 SourceLocation()), 1419 Ctor, 1420 SourceLocation(), 1421 CtorArgs.takeAs<Expr>(), 1422 CtorArgs.size(), 1423 SourceLocation()); 1424 AllToInit.push_back(Member); 1425 } 1426 } 1427 1428 for (CXXRecordDecl::base_class_iterator Base = 1429 ClassDecl->bases_begin(), 1430 E = ClassDecl->bases_end(); Base != E; ++Base) { 1431 // Virtuals are in the virtual base list and already constructed. 1432 if (Base->isVirtual()) 1433 continue; 1434 // Skip dependent types. 1435 if (Base->getType()->isDependentType()) 1436 continue; 1437 if (CXXBaseOrMemberInitializer *Value 1438 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1439 AllToInit.push_back(Value); 1440 } 1441 else { 1442 CXXRecordDecl *BaseDecl = 1443 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1444 assert(BaseDecl && "SetBaseOrMemberInitializers - BaseDecl null"); 1445 CXXConstructorDecl *Ctor = BaseDecl->getDefaultConstructor(Context); 1446 if (!Ctor) { 1447 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1448 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1449 << 0 << Base->getType(); 1450 Diag(BaseDecl->getLocation(), diag::note_previous_decl) 1451 << Context.getTagDeclType(BaseDecl); 1452 HadError = true; 1453 continue; 1454 } 1455 1456 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1457 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1458 Constructor->getLocation(), CtorArgs)) 1459 continue; 1460 1461 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1462 1463 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1464 // subexpression so we can wrap it in a CXXExprWithTemporaries if 1465 // necessary. 1466 // FIXME: Is there any better source-location information we can give? 1467 ExprTemporaries.clear(); 1468 CXXBaseOrMemberInitializer *Member = 1469 new (Context) CXXBaseOrMemberInitializer(Context, 1470 Context.getTrivialTypeSourceInfo(Base->getType(), 1471 SourceLocation()), 1472 Ctor, 1473 SourceLocation(), 1474 CtorArgs.takeAs<Expr>(), 1475 CtorArgs.size(), 1476 SourceLocation()); 1477 AllToInit.push_back(Member); 1478 } 1479 } 1480 } 1481 1482 // non-static data members. 1483 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1484 E = ClassDecl->field_end(); Field != E; ++Field) { 1485 if ((*Field)->isAnonymousStructOrUnion()) { 1486 if (const RecordType *FieldClassType = 1487 Field->getType()->getAs<RecordType>()) { 1488 CXXRecordDecl *FieldClassDecl 1489 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1490 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1491 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1492 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1493 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1494 // set to the anonymous union data member used in the initializer 1495 // list. 1496 Value->setMember(*Field); 1497 Value->setAnonUnionMember(*FA); 1498 AllToInit.push_back(Value); 1499 break; 1500 } 1501 } 1502 } 1503 continue; 1504 } 1505 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1506 AllToInit.push_back(Value); 1507 continue; 1508 } 1509 1510 if ((*Field)->getType()->isDependentType()) 1511 continue; 1512 1513 QualType FT = Context.getBaseElementType((*Field)->getType()); 1514 if (const RecordType* RT = FT->getAs<RecordType>()) { 1515 CXXConstructorDecl *Ctor = 1516 cast<CXXRecordDecl>(RT->getDecl())->getDefaultConstructor(Context); 1517 if (!Ctor) { 1518 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1519 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1520 << 1 << (*Field)->getDeclName(); 1521 Diag(Field->getLocation(), diag::note_field_decl); 1522 Diag(RT->getDecl()->getLocation(), diag::note_previous_decl) 1523 << Context.getTagDeclType(RT->getDecl()); 1524 HadError = true; 1525 continue; 1526 } 1527 1528 if (FT.isConstQualified() && Ctor->isTrivial()) { 1529 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1530 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1531 << 1 << (*Field)->getDeclName(); 1532 Diag((*Field)->getLocation(), diag::note_declared_at); 1533 HadError = true; 1534 } 1535 1536 // Don't create initializers for trivial constructors, since they don't 1537 // actually need to be run. 1538 if (Ctor->isTrivial()) 1539 continue; 1540 1541 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1542 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1543 Constructor->getLocation(), CtorArgs)) 1544 continue; 1545 1546 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1547 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1548 ExprTemporaries.clear(); 1549 CXXBaseOrMemberInitializer *Member = 1550 new (Context) CXXBaseOrMemberInitializer(Context, 1551 *Field, SourceLocation(), 1552 Ctor, 1553 SourceLocation(), 1554 CtorArgs.takeAs<Expr>(), 1555 CtorArgs.size(), 1556 SourceLocation()); 1557 1558 AllToInit.push_back(Member); 1559 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1560 } 1561 else if (FT->isReferenceType()) { 1562 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1563 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1564 << 0 << (*Field)->getDeclName(); 1565 Diag((*Field)->getLocation(), diag::note_declared_at); 1566 HadError = true; 1567 } 1568 else if (FT.isConstQualified()) { 1569 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1570 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1571 << 1 << (*Field)->getDeclName(); 1572 Diag((*Field)->getLocation(), diag::note_declared_at); 1573 HadError = true; 1574 } 1575 } 1576 1577 NumInitializers = AllToInit.size(); 1578 if (NumInitializers > 0) { 1579 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1580 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1581 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1582 1583 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1584 for (unsigned Idx = 0; Idx < NumInitializers; ++Idx) 1585 baseOrMemberInitializers[Idx] = AllToInit[Idx]; 1586 } 1587 1588 return HadError; 1589} 1590 1591static void *GetKeyForTopLevelField(FieldDecl *Field) { 1592 // For anonymous unions, use the class declaration as the key. 1593 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1594 if (RT->getDecl()->isAnonymousStructOrUnion()) 1595 return static_cast<void *>(RT->getDecl()); 1596 } 1597 return static_cast<void *>(Field); 1598} 1599 1600static void *GetKeyForBase(QualType BaseType) { 1601 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1602 return (void *)RT; 1603 1604 assert(0 && "Unexpected base type!"); 1605 return 0; 1606} 1607 1608static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1609 bool MemberMaybeAnon = false) { 1610 // For fields injected into the class via declaration of an anonymous union, 1611 // use its anonymous union class declaration as the unique key. 1612 if (Member->isMemberInitializer()) { 1613 FieldDecl *Field = Member->getMember(); 1614 1615 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1616 // data member of the class. Data member used in the initializer list is 1617 // in AnonUnionMember field. 1618 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1619 Field = Member->getAnonUnionMember(); 1620 if (Field->getDeclContext()->isRecord()) { 1621 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 1622 if (RD->isAnonymousStructOrUnion()) 1623 return static_cast<void *>(RD); 1624 } 1625 return static_cast<void *>(Field); 1626 } 1627 1628 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1629} 1630 1631/// ActOnMemInitializers - Handle the member initializers for a constructor. 1632void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1633 SourceLocation ColonLoc, 1634 MemInitTy **MemInits, unsigned NumMemInits) { 1635 if (!ConstructorDecl) 1636 return; 1637 1638 AdjustDeclIfTemplate(ConstructorDecl); 1639 1640 CXXConstructorDecl *Constructor 1641 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1642 1643 if (!Constructor) { 1644 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1645 return; 1646 } 1647 1648 if (!Constructor->isDependentContext()) { 1649 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 1650 bool err = false; 1651 for (unsigned i = 0; i < NumMemInits; i++) { 1652 CXXBaseOrMemberInitializer *Member = 1653 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1654 void *KeyToMember = GetKeyForMember(Member); 1655 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1656 if (!PrevMember) { 1657 PrevMember = Member; 1658 continue; 1659 } 1660 if (FieldDecl *Field = Member->getMember()) 1661 Diag(Member->getSourceLocation(), 1662 diag::error_multiple_mem_initialization) 1663 << Field->getNameAsString() 1664 << Member->getSourceRange(); 1665 else { 1666 Type *BaseClass = Member->getBaseClass(); 1667 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1668 Diag(Member->getSourceLocation(), 1669 diag::error_multiple_base_initialization) 1670 << QualType(BaseClass, 0) 1671 << Member->getSourceRange(); 1672 } 1673 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1674 << 0; 1675 err = true; 1676 } 1677 1678 if (err) 1679 return; 1680 } 1681 1682 SetBaseOrMemberInitializers(Constructor, 1683 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 1684 NumMemInits, false); 1685 1686 if (Constructor->isDependentContext()) 1687 return; 1688 1689 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1690 Diagnostic::Ignored && 1691 Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1692 Diagnostic::Ignored) 1693 return; 1694 1695 // Also issue warning if order of ctor-initializer list does not match order 1696 // of 1) base class declarations and 2) order of non-static data members. 1697 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1698 1699 CXXRecordDecl *ClassDecl 1700 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1701 // Push virtual bases before others. 1702 for (CXXRecordDecl::base_class_iterator VBase = 1703 ClassDecl->vbases_begin(), 1704 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1705 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1706 1707 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1708 E = ClassDecl->bases_end(); Base != E; ++Base) { 1709 // Virtuals are alread in the virtual base list and are constructed 1710 // first. 1711 if (Base->isVirtual()) 1712 continue; 1713 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1714 } 1715 1716 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1717 E = ClassDecl->field_end(); Field != E; ++Field) 1718 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1719 1720 int Last = AllBaseOrMembers.size(); 1721 int curIndex = 0; 1722 CXXBaseOrMemberInitializer *PrevMember = 0; 1723 for (unsigned i = 0; i < NumMemInits; i++) { 1724 CXXBaseOrMemberInitializer *Member = 1725 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1726 void *MemberInCtorList = GetKeyForMember(Member, true); 1727 1728 for (; curIndex < Last; curIndex++) 1729 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1730 break; 1731 if (curIndex == Last) { 1732 assert(PrevMember && "Member not in member list?!"); 1733 // Initializer as specified in ctor-initializer list is out of order. 1734 // Issue a warning diagnostic. 1735 if (PrevMember->isBaseInitializer()) { 1736 // Diagnostics is for an initialized base class. 1737 Type *BaseClass = PrevMember->getBaseClass(); 1738 Diag(PrevMember->getSourceLocation(), 1739 diag::warn_base_initialized) 1740 << QualType(BaseClass, 0); 1741 } else { 1742 FieldDecl *Field = PrevMember->getMember(); 1743 Diag(PrevMember->getSourceLocation(), 1744 diag::warn_field_initialized) 1745 << Field->getNameAsString(); 1746 } 1747 // Also the note! 1748 if (FieldDecl *Field = Member->getMember()) 1749 Diag(Member->getSourceLocation(), 1750 diag::note_fieldorbase_initialized_here) << 0 1751 << Field->getNameAsString(); 1752 else { 1753 Type *BaseClass = Member->getBaseClass(); 1754 Diag(Member->getSourceLocation(), 1755 diag::note_fieldorbase_initialized_here) << 1 1756 << QualType(BaseClass, 0); 1757 } 1758 for (curIndex = 0; curIndex < Last; curIndex++) 1759 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1760 break; 1761 } 1762 PrevMember = Member; 1763 } 1764} 1765 1766void 1767Sema::MarkBaseAndMemberDestructorsReferenced(CXXDestructorDecl *Destructor) { 1768 // Ignore dependent destructors. 1769 if (Destructor->isDependentContext()) 1770 return; 1771 1772 CXXRecordDecl *ClassDecl = Destructor->getParent(); 1773 1774 // Non-static data members. 1775 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1776 E = ClassDecl->field_end(); I != E; ++I) { 1777 FieldDecl *Field = *I; 1778 1779 QualType FieldType = Context.getBaseElementType(Field->getType()); 1780 1781 const RecordType* RT = FieldType->getAs<RecordType>(); 1782 if (!RT) 1783 continue; 1784 1785 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1786 if (FieldClassDecl->hasTrivialDestructor()) 1787 continue; 1788 1789 const CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1790 MarkDeclarationReferenced(Destructor->getLocation(), 1791 const_cast<CXXDestructorDecl*>(Dtor)); 1792 } 1793 1794 // Bases. 1795 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1796 E = ClassDecl->bases_end(); Base != E; ++Base) { 1797 // Ignore virtual bases. 1798 if (Base->isVirtual()) 1799 continue; 1800 1801 // Ignore trivial destructors. 1802 CXXRecordDecl *BaseClassDecl 1803 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1804 if (BaseClassDecl->hasTrivialDestructor()) 1805 continue; 1806 1807 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1808 MarkDeclarationReferenced(Destructor->getLocation(), 1809 const_cast<CXXDestructorDecl*>(Dtor)); 1810 } 1811 1812 // Virtual bases. 1813 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1814 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1815 // Ignore trivial destructors. 1816 CXXRecordDecl *BaseClassDecl 1817 = cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1818 if (BaseClassDecl->hasTrivialDestructor()) 1819 continue; 1820 1821 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1822 MarkDeclarationReferenced(Destructor->getLocation(), 1823 const_cast<CXXDestructorDecl*>(Dtor)); 1824 } 1825} 1826 1827void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1828 if (!CDtorDecl) 1829 return; 1830 1831 AdjustDeclIfTemplate(CDtorDecl); 1832 1833 if (CXXConstructorDecl *Constructor 1834 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1835 SetBaseOrMemberInitializers(Constructor, 0, 0, false); 1836} 1837 1838namespace { 1839 /// PureVirtualMethodCollector - traverses a class and its superclasses 1840 /// and determines if it has any pure virtual methods. 1841 class PureVirtualMethodCollector { 1842 ASTContext &Context; 1843 1844 public: 1845 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1846 1847 private: 1848 MethodList Methods; 1849 1850 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1851 1852 public: 1853 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1854 : Context(Ctx) { 1855 1856 MethodList List; 1857 Collect(RD, List); 1858 1859 // Copy the temporary list to methods, and make sure to ignore any 1860 // null entries. 1861 for (size_t i = 0, e = List.size(); i != e; ++i) { 1862 if (List[i]) 1863 Methods.push_back(List[i]); 1864 } 1865 } 1866 1867 bool empty() const { return Methods.empty(); } 1868 1869 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1870 MethodList::const_iterator methods_end() { return Methods.end(); } 1871 }; 1872 1873 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1874 MethodList& Methods) { 1875 // First, collect the pure virtual methods for the base classes. 1876 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1877 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1878 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1879 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1880 if (BaseDecl && BaseDecl->isAbstract()) 1881 Collect(BaseDecl, Methods); 1882 } 1883 } 1884 1885 // Next, zero out any pure virtual methods that this class overrides. 1886 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1887 1888 MethodSetTy OverriddenMethods; 1889 size_t MethodsSize = Methods.size(); 1890 1891 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1892 i != e; ++i) { 1893 // Traverse the record, looking for methods. 1894 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1895 // If the method is pure virtual, add it to the methods vector. 1896 if (MD->isPure()) 1897 Methods.push_back(MD); 1898 1899 // Record all the overridden methods in our set. 1900 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1901 E = MD->end_overridden_methods(); I != E; ++I) { 1902 // Keep track of the overridden methods. 1903 OverriddenMethods.insert(*I); 1904 } 1905 } 1906 } 1907 1908 // Now go through the methods and zero out all the ones we know are 1909 // overridden. 1910 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1911 if (OverriddenMethods.count(Methods[i])) 1912 Methods[i] = 0; 1913 } 1914 1915 } 1916} 1917 1918 1919bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1920 unsigned DiagID, AbstractDiagSelID SelID, 1921 const CXXRecordDecl *CurrentRD) { 1922 if (SelID == -1) 1923 return RequireNonAbstractType(Loc, T, 1924 PDiag(DiagID), CurrentRD); 1925 else 1926 return RequireNonAbstractType(Loc, T, 1927 PDiag(DiagID) << SelID, CurrentRD); 1928} 1929 1930bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1931 const PartialDiagnostic &PD, 1932 const CXXRecordDecl *CurrentRD) { 1933 if (!getLangOptions().CPlusPlus) 1934 return false; 1935 1936 if (const ArrayType *AT = Context.getAsArrayType(T)) 1937 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 1938 CurrentRD); 1939 1940 if (const PointerType *PT = T->getAs<PointerType>()) { 1941 // Find the innermost pointer type. 1942 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1943 PT = T; 1944 1945 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1946 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 1947 } 1948 1949 const RecordType *RT = T->getAs<RecordType>(); 1950 if (!RT) 1951 return false; 1952 1953 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1954 if (!RD) 1955 return false; 1956 1957 if (CurrentRD && CurrentRD != RD) 1958 return false; 1959 1960 if (!RD->isAbstract()) 1961 return false; 1962 1963 Diag(Loc, PD) << RD->getDeclName(); 1964 1965 // Check if we've already emitted the list of pure virtual functions for this 1966 // class. 1967 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1968 return true; 1969 1970 PureVirtualMethodCollector Collector(Context, RD); 1971 1972 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1973 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1974 const CXXMethodDecl *MD = *I; 1975 1976 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1977 MD->getDeclName(); 1978 } 1979 1980 if (!PureVirtualClassDiagSet) 1981 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1982 PureVirtualClassDiagSet->insert(RD); 1983 1984 return true; 1985} 1986 1987namespace { 1988 class AbstractClassUsageDiagnoser 1989 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1990 Sema &SemaRef; 1991 CXXRecordDecl *AbstractClass; 1992 1993 bool VisitDeclContext(const DeclContext *DC) { 1994 bool Invalid = false; 1995 1996 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1997 E = DC->decls_end(); I != E; ++I) 1998 Invalid |= Visit(*I); 1999 2000 return Invalid; 2001 } 2002 2003 public: 2004 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2005 : SemaRef(SemaRef), AbstractClass(ac) { 2006 Visit(SemaRef.Context.getTranslationUnitDecl()); 2007 } 2008 2009 bool VisitFunctionDecl(const FunctionDecl *FD) { 2010 if (FD->isThisDeclarationADefinition()) { 2011 // No need to do the check if we're in a definition, because it requires 2012 // that the return/param types are complete. 2013 // because that requires 2014 return VisitDeclContext(FD); 2015 } 2016 2017 // Check the return type. 2018 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2019 bool Invalid = 2020 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2021 diag::err_abstract_type_in_decl, 2022 Sema::AbstractReturnType, 2023 AbstractClass); 2024 2025 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2026 E = FD->param_end(); I != E; ++I) { 2027 const ParmVarDecl *VD = *I; 2028 Invalid |= 2029 SemaRef.RequireNonAbstractType(VD->getLocation(), 2030 VD->getOriginalType(), 2031 diag::err_abstract_type_in_decl, 2032 Sema::AbstractParamType, 2033 AbstractClass); 2034 } 2035 2036 return Invalid; 2037 } 2038 2039 bool VisitDecl(const Decl* D) { 2040 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2041 return VisitDeclContext(DC); 2042 2043 return false; 2044 } 2045 }; 2046} 2047 2048/// \brief Perform semantic checks on a class definition that has been 2049/// completing, introducing implicitly-declared members, checking for 2050/// abstract types, etc. 2051void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2052 if (!Record || Record->isInvalidDecl()) 2053 return; 2054 2055 if (!Record->isDependentType()) 2056 AddImplicitlyDeclaredMembersToClass(Record); 2057 2058 if (Record->isInvalidDecl()) 2059 return; 2060 2061 if (!Record->isAbstract()) { 2062 // Collect all the pure virtual methods and see if this is an abstract 2063 // class after all. 2064 PureVirtualMethodCollector Collector(Context, Record); 2065 if (!Collector.empty()) 2066 Record->setAbstract(true); 2067 } 2068 2069 if (Record->isAbstract()) 2070 (void)AbstractClassUsageDiagnoser(*this, Record); 2071} 2072 2073void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2074 DeclPtrTy TagDecl, 2075 SourceLocation LBrac, 2076 SourceLocation RBrac) { 2077 if (!TagDecl) 2078 return; 2079 2080 AdjustDeclIfTemplate(TagDecl); 2081 2082 ActOnFields(S, RLoc, TagDecl, 2083 (DeclPtrTy*)FieldCollector->getCurFields(), 2084 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 2085 2086 CheckCompletedCXXClass( 2087 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2088} 2089 2090/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2091/// special functions, such as the default constructor, copy 2092/// constructor, or destructor, to the given C++ class (C++ 2093/// [special]p1). This routine can only be executed just before the 2094/// definition of the class is complete. 2095void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2096 CanQualType ClassType 2097 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2098 2099 // FIXME: Implicit declarations have exception specifications, which are 2100 // the union of the specifications of the implicitly called functions. 2101 2102 if (!ClassDecl->hasUserDeclaredConstructor()) { 2103 // C++ [class.ctor]p5: 2104 // A default constructor for a class X is a constructor of class X 2105 // that can be called without an argument. If there is no 2106 // user-declared constructor for class X, a default constructor is 2107 // implicitly declared. An implicitly-declared default constructor 2108 // is an inline public member of its class. 2109 DeclarationName Name 2110 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2111 CXXConstructorDecl *DefaultCon = 2112 CXXConstructorDecl::Create(Context, ClassDecl, 2113 ClassDecl->getLocation(), Name, 2114 Context.getFunctionType(Context.VoidTy, 2115 0, 0, false, 0), 2116 /*TInfo=*/0, 2117 /*isExplicit=*/false, 2118 /*isInline=*/true, 2119 /*isImplicitlyDeclared=*/true); 2120 DefaultCon->setAccess(AS_public); 2121 DefaultCon->setImplicit(); 2122 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2123 ClassDecl->addDecl(DefaultCon); 2124 } 2125 2126 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2127 // C++ [class.copy]p4: 2128 // If the class definition does not explicitly declare a copy 2129 // constructor, one is declared implicitly. 2130 2131 // C++ [class.copy]p5: 2132 // The implicitly-declared copy constructor for a class X will 2133 // have the form 2134 // 2135 // X::X(const X&) 2136 // 2137 // if 2138 bool HasConstCopyConstructor = true; 2139 2140 // -- each direct or virtual base class B of X has a copy 2141 // constructor whose first parameter is of type const B& or 2142 // const volatile B&, and 2143 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2144 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2145 const CXXRecordDecl *BaseClassDecl 2146 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2147 HasConstCopyConstructor 2148 = BaseClassDecl->hasConstCopyConstructor(Context); 2149 } 2150 2151 // -- for all the nonstatic data members of X that are of a 2152 // class type M (or array thereof), each such class type 2153 // has a copy constructor whose first parameter is of type 2154 // const M& or const volatile M&. 2155 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2156 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2157 ++Field) { 2158 QualType FieldType = (*Field)->getType(); 2159 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2160 FieldType = Array->getElementType(); 2161 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2162 const CXXRecordDecl *FieldClassDecl 2163 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2164 HasConstCopyConstructor 2165 = FieldClassDecl->hasConstCopyConstructor(Context); 2166 } 2167 } 2168 2169 // Otherwise, the implicitly declared copy constructor will have 2170 // the form 2171 // 2172 // X::X(X&) 2173 QualType ArgType = ClassType; 2174 if (HasConstCopyConstructor) 2175 ArgType = ArgType.withConst(); 2176 ArgType = Context.getLValueReferenceType(ArgType); 2177 2178 // An implicitly-declared copy constructor is an inline public 2179 // member of its class. 2180 DeclarationName Name 2181 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2182 CXXConstructorDecl *CopyConstructor 2183 = CXXConstructorDecl::Create(Context, ClassDecl, 2184 ClassDecl->getLocation(), Name, 2185 Context.getFunctionType(Context.VoidTy, 2186 &ArgType, 1, 2187 false, 0), 2188 /*TInfo=*/0, 2189 /*isExplicit=*/false, 2190 /*isInline=*/true, 2191 /*isImplicitlyDeclared=*/true); 2192 CopyConstructor->setAccess(AS_public); 2193 CopyConstructor->setImplicit(); 2194 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2195 2196 // Add the parameter to the constructor. 2197 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2198 ClassDecl->getLocation(), 2199 /*IdentifierInfo=*/0, 2200 ArgType, /*TInfo=*/0, 2201 VarDecl::None, 0); 2202 CopyConstructor->setParams(Context, &FromParam, 1); 2203 ClassDecl->addDecl(CopyConstructor); 2204 } 2205 2206 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2207 // Note: The following rules are largely analoguous to the copy 2208 // constructor rules. Note that virtual bases are not taken into account 2209 // for determining the argument type of the operator. Note also that 2210 // operators taking an object instead of a reference are allowed. 2211 // 2212 // C++ [class.copy]p10: 2213 // If the class definition does not explicitly declare a copy 2214 // assignment operator, one is declared implicitly. 2215 // The implicitly-defined copy assignment operator for a class X 2216 // will have the form 2217 // 2218 // X& X::operator=(const X&) 2219 // 2220 // if 2221 bool HasConstCopyAssignment = true; 2222 2223 // -- each direct base class B of X has a copy assignment operator 2224 // whose parameter is of type const B&, const volatile B& or B, 2225 // and 2226 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2227 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2228 assert(!Base->getType()->isDependentType() && 2229 "Cannot generate implicit members for class with dependent bases."); 2230 const CXXRecordDecl *BaseClassDecl 2231 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2232 const CXXMethodDecl *MD = 0; 2233 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2234 MD); 2235 } 2236 2237 // -- for all the nonstatic data members of X that are of a class 2238 // type M (or array thereof), each such class type has a copy 2239 // assignment operator whose parameter is of type const M&, 2240 // const volatile M& or M. 2241 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2242 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2243 ++Field) { 2244 QualType FieldType = (*Field)->getType(); 2245 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2246 FieldType = Array->getElementType(); 2247 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2248 const CXXRecordDecl *FieldClassDecl 2249 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2250 const CXXMethodDecl *MD = 0; 2251 HasConstCopyAssignment 2252 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2253 } 2254 } 2255 2256 // Otherwise, the implicitly declared copy assignment operator will 2257 // have the form 2258 // 2259 // X& X::operator=(X&) 2260 QualType ArgType = ClassType; 2261 QualType RetType = Context.getLValueReferenceType(ArgType); 2262 if (HasConstCopyAssignment) 2263 ArgType = ArgType.withConst(); 2264 ArgType = Context.getLValueReferenceType(ArgType); 2265 2266 // An implicitly-declared copy assignment operator is an inline public 2267 // member of its class. 2268 DeclarationName Name = 2269 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2270 CXXMethodDecl *CopyAssignment = 2271 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2272 Context.getFunctionType(RetType, &ArgType, 1, 2273 false, 0), 2274 /*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2275 CopyAssignment->setAccess(AS_public); 2276 CopyAssignment->setImplicit(); 2277 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2278 CopyAssignment->setCopyAssignment(true); 2279 2280 // Add the parameter to the operator. 2281 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2282 ClassDecl->getLocation(), 2283 /*IdentifierInfo=*/0, 2284 ArgType, /*TInfo=*/0, 2285 VarDecl::None, 0); 2286 CopyAssignment->setParams(Context, &FromParam, 1); 2287 2288 // Don't call addedAssignmentOperator. There is no way to distinguish an 2289 // implicit from an explicit assignment operator. 2290 ClassDecl->addDecl(CopyAssignment); 2291 AddOverriddenMethods(ClassDecl, CopyAssignment); 2292 } 2293 2294 if (!ClassDecl->hasUserDeclaredDestructor()) { 2295 // C++ [class.dtor]p2: 2296 // If a class has no user-declared destructor, a destructor is 2297 // declared implicitly. An implicitly-declared destructor is an 2298 // inline public member of its class. 2299 DeclarationName Name 2300 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2301 CXXDestructorDecl *Destructor 2302 = CXXDestructorDecl::Create(Context, ClassDecl, 2303 ClassDecl->getLocation(), Name, 2304 Context.getFunctionType(Context.VoidTy, 2305 0, 0, false, 0), 2306 /*isInline=*/true, 2307 /*isImplicitlyDeclared=*/true); 2308 Destructor->setAccess(AS_public); 2309 Destructor->setImplicit(); 2310 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2311 ClassDecl->addDecl(Destructor); 2312 2313 AddOverriddenMethods(ClassDecl, Destructor); 2314 } 2315} 2316 2317void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2318 Decl *D = TemplateD.getAs<Decl>(); 2319 if (!D) 2320 return; 2321 2322 TemplateParameterList *Params = 0; 2323 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2324 Params = Template->getTemplateParameters(); 2325 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2326 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2327 Params = PartialSpec->getTemplateParameters(); 2328 else 2329 return; 2330 2331 for (TemplateParameterList::iterator Param = Params->begin(), 2332 ParamEnd = Params->end(); 2333 Param != ParamEnd; ++Param) { 2334 NamedDecl *Named = cast<NamedDecl>(*Param); 2335 if (Named->getDeclName()) { 2336 S->AddDecl(DeclPtrTy::make(Named)); 2337 IdResolver.AddDecl(Named); 2338 } 2339 } 2340} 2341 2342void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2343 if (!RecordD) return; 2344 AdjustDeclIfTemplate(RecordD); 2345 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2346 PushDeclContext(S, Record); 2347} 2348 2349void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2350 if (!RecordD) return; 2351 PopDeclContext(); 2352} 2353 2354/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2355/// parsing a top-level (non-nested) C++ class, and we are now 2356/// parsing those parts of the given Method declaration that could 2357/// not be parsed earlier (C++ [class.mem]p2), such as default 2358/// arguments. This action should enter the scope of the given 2359/// Method declaration as if we had just parsed the qualified method 2360/// name. However, it should not bring the parameters into scope; 2361/// that will be performed by ActOnDelayedCXXMethodParameter. 2362void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2363} 2364 2365/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2366/// C++ method declaration. We're (re-)introducing the given 2367/// function parameter into scope for use in parsing later parts of 2368/// the method declaration. For example, we could see an 2369/// ActOnParamDefaultArgument event for this parameter. 2370void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2371 if (!ParamD) 2372 return; 2373 2374 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2375 2376 // If this parameter has an unparsed default argument, clear it out 2377 // to make way for the parsed default argument. 2378 if (Param->hasUnparsedDefaultArg()) 2379 Param->setDefaultArg(0); 2380 2381 S->AddDecl(DeclPtrTy::make(Param)); 2382 if (Param->getDeclName()) 2383 IdResolver.AddDecl(Param); 2384} 2385 2386/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2387/// processing the delayed method declaration for Method. The method 2388/// declaration is now considered finished. There may be a separate 2389/// ActOnStartOfFunctionDef action later (not necessarily 2390/// immediately!) for this method, if it was also defined inside the 2391/// class body. 2392void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2393 if (!MethodD) 2394 return; 2395 2396 AdjustDeclIfTemplate(MethodD); 2397 2398 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2399 2400 // Now that we have our default arguments, check the constructor 2401 // again. It could produce additional diagnostics or affect whether 2402 // the class has implicitly-declared destructors, among other 2403 // things. 2404 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2405 CheckConstructor(Constructor); 2406 2407 // Check the default arguments, which we may have added. 2408 if (!Method->isInvalidDecl()) 2409 CheckCXXDefaultArguments(Method); 2410} 2411 2412/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2413/// the well-formedness of the constructor declarator @p D with type @p 2414/// R. If there are any errors in the declarator, this routine will 2415/// emit diagnostics and set the invalid bit to true. In any case, the type 2416/// will be updated to reflect a well-formed type for the constructor and 2417/// returned. 2418QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2419 FunctionDecl::StorageClass &SC) { 2420 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2421 2422 // C++ [class.ctor]p3: 2423 // A constructor shall not be virtual (10.3) or static (9.4). A 2424 // constructor can be invoked for a const, volatile or const 2425 // volatile object. A constructor shall not be declared const, 2426 // volatile, or const volatile (9.3.2). 2427 if (isVirtual) { 2428 if (!D.isInvalidType()) 2429 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2430 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2431 << SourceRange(D.getIdentifierLoc()); 2432 D.setInvalidType(); 2433 } 2434 if (SC == FunctionDecl::Static) { 2435 if (!D.isInvalidType()) 2436 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2437 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2438 << SourceRange(D.getIdentifierLoc()); 2439 D.setInvalidType(); 2440 SC = FunctionDecl::None; 2441 } 2442 2443 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2444 if (FTI.TypeQuals != 0) { 2445 if (FTI.TypeQuals & Qualifiers::Const) 2446 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2447 << "const" << SourceRange(D.getIdentifierLoc()); 2448 if (FTI.TypeQuals & Qualifiers::Volatile) 2449 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2450 << "volatile" << SourceRange(D.getIdentifierLoc()); 2451 if (FTI.TypeQuals & Qualifiers::Restrict) 2452 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2453 << "restrict" << SourceRange(D.getIdentifierLoc()); 2454 } 2455 2456 // Rebuild the function type "R" without any type qualifiers (in 2457 // case any of the errors above fired) and with "void" as the 2458 // return type, since constructors don't have return types. We 2459 // *always* have to do this, because GetTypeForDeclarator will 2460 // put in a result type of "int" when none was specified. 2461 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2462 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2463 Proto->getNumArgs(), 2464 Proto->isVariadic(), 0); 2465} 2466 2467/// CheckConstructor - Checks a fully-formed constructor for 2468/// well-formedness, issuing any diagnostics required. Returns true if 2469/// the constructor declarator is invalid. 2470void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2471 CXXRecordDecl *ClassDecl 2472 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2473 if (!ClassDecl) 2474 return Constructor->setInvalidDecl(); 2475 2476 // C++ [class.copy]p3: 2477 // A declaration of a constructor for a class X is ill-formed if 2478 // its first parameter is of type (optionally cv-qualified) X and 2479 // either there are no other parameters or else all other 2480 // parameters have default arguments. 2481 if (!Constructor->isInvalidDecl() && 2482 ((Constructor->getNumParams() == 1) || 2483 (Constructor->getNumParams() > 1 && 2484 Constructor->getParamDecl(1)->hasDefaultArg())) && 2485 Constructor->getTemplateSpecializationKind() 2486 != TSK_ImplicitInstantiation) { 2487 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2488 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2489 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2490 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2491 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2492 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 2493 2494 // FIXME: Rather that making the constructor invalid, we should endeavor 2495 // to fix the type. 2496 Constructor->setInvalidDecl(); 2497 } 2498 } 2499 2500 // Notify the class that we've added a constructor. 2501 ClassDecl->addedConstructor(Context, Constructor); 2502} 2503 2504/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2505/// issuing any diagnostics required. Returns true on error. 2506bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2507 CXXRecordDecl *RD = Destructor->getParent(); 2508 2509 if (Destructor->isVirtual()) { 2510 SourceLocation Loc; 2511 2512 if (!Destructor->isImplicit()) 2513 Loc = Destructor->getLocation(); 2514 else 2515 Loc = RD->getLocation(); 2516 2517 // If we have a virtual destructor, look up the deallocation function 2518 FunctionDecl *OperatorDelete = 0; 2519 DeclarationName Name = 2520 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2521 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2522 return true; 2523 2524 Destructor->setOperatorDelete(OperatorDelete); 2525 } 2526 2527 return false; 2528} 2529 2530static inline bool 2531FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2532 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2533 FTI.ArgInfo[0].Param && 2534 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2535} 2536 2537/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2538/// the well-formednes of the destructor declarator @p D with type @p 2539/// R. If there are any errors in the declarator, this routine will 2540/// emit diagnostics and set the declarator to invalid. Even if this happens, 2541/// will be updated to reflect a well-formed type for the destructor and 2542/// returned. 2543QualType Sema::CheckDestructorDeclarator(Declarator &D, 2544 FunctionDecl::StorageClass& SC) { 2545 // C++ [class.dtor]p1: 2546 // [...] A typedef-name that names a class is a class-name 2547 // (7.1.3); however, a typedef-name that names a class shall not 2548 // be used as the identifier in the declarator for a destructor 2549 // declaration. 2550 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2551 if (isa<TypedefType>(DeclaratorType)) { 2552 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2553 << DeclaratorType; 2554 D.setInvalidType(); 2555 } 2556 2557 // C++ [class.dtor]p2: 2558 // A destructor is used to destroy objects of its class type. A 2559 // destructor takes no parameters, and no return type can be 2560 // specified for it (not even void). The address of a destructor 2561 // shall not be taken. A destructor shall not be static. A 2562 // destructor can be invoked for a const, volatile or const 2563 // volatile object. A destructor shall not be declared const, 2564 // volatile or const volatile (9.3.2). 2565 if (SC == FunctionDecl::Static) { 2566 if (!D.isInvalidType()) 2567 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2568 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2569 << SourceRange(D.getIdentifierLoc()); 2570 SC = FunctionDecl::None; 2571 D.setInvalidType(); 2572 } 2573 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2574 // Destructors don't have return types, but the parser will 2575 // happily parse something like: 2576 // 2577 // class X { 2578 // float ~X(); 2579 // }; 2580 // 2581 // The return type will be eliminated later. 2582 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2583 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2584 << SourceRange(D.getIdentifierLoc()); 2585 } 2586 2587 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2588 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2589 if (FTI.TypeQuals & Qualifiers::Const) 2590 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2591 << "const" << SourceRange(D.getIdentifierLoc()); 2592 if (FTI.TypeQuals & Qualifiers::Volatile) 2593 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2594 << "volatile" << SourceRange(D.getIdentifierLoc()); 2595 if (FTI.TypeQuals & Qualifiers::Restrict) 2596 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2597 << "restrict" << SourceRange(D.getIdentifierLoc()); 2598 D.setInvalidType(); 2599 } 2600 2601 // Make sure we don't have any parameters. 2602 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2603 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2604 2605 // Delete the parameters. 2606 FTI.freeArgs(); 2607 D.setInvalidType(); 2608 } 2609 2610 // Make sure the destructor isn't variadic. 2611 if (FTI.isVariadic) { 2612 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2613 D.setInvalidType(); 2614 } 2615 2616 // Rebuild the function type "R" without any type qualifiers or 2617 // parameters (in case any of the errors above fired) and with 2618 // "void" as the return type, since destructors don't have return 2619 // types. We *always* have to do this, because GetTypeForDeclarator 2620 // will put in a result type of "int" when none was specified. 2621 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 2622} 2623 2624/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2625/// well-formednes of the conversion function declarator @p D with 2626/// type @p R. If there are any errors in the declarator, this routine 2627/// will emit diagnostics and return true. Otherwise, it will return 2628/// false. Either way, the type @p R will be updated to reflect a 2629/// well-formed type for the conversion operator. 2630void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2631 FunctionDecl::StorageClass& SC) { 2632 // C++ [class.conv.fct]p1: 2633 // Neither parameter types nor return type can be specified. The 2634 // type of a conversion function (8.3.5) is "function taking no 2635 // parameter returning conversion-type-id." 2636 if (SC == FunctionDecl::Static) { 2637 if (!D.isInvalidType()) 2638 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2639 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2640 << SourceRange(D.getIdentifierLoc()); 2641 D.setInvalidType(); 2642 SC = FunctionDecl::None; 2643 } 2644 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2645 // Conversion functions don't have return types, but the parser will 2646 // happily parse something like: 2647 // 2648 // class X { 2649 // float operator bool(); 2650 // }; 2651 // 2652 // The return type will be changed later anyway. 2653 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2654 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2655 << SourceRange(D.getIdentifierLoc()); 2656 } 2657 2658 // Make sure we don't have any parameters. 2659 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2660 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2661 2662 // Delete the parameters. 2663 D.getTypeObject(0).Fun.freeArgs(); 2664 D.setInvalidType(); 2665 } 2666 2667 // Make sure the conversion function isn't variadic. 2668 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2669 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2670 D.setInvalidType(); 2671 } 2672 2673 // C++ [class.conv.fct]p4: 2674 // The conversion-type-id shall not represent a function type nor 2675 // an array type. 2676 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2677 if (ConvType->isArrayType()) { 2678 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2679 ConvType = Context.getPointerType(ConvType); 2680 D.setInvalidType(); 2681 } else if (ConvType->isFunctionType()) { 2682 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2683 ConvType = Context.getPointerType(ConvType); 2684 D.setInvalidType(); 2685 } 2686 2687 // Rebuild the function type "R" without any parameters (in case any 2688 // of the errors above fired) and with the conversion type as the 2689 // return type. 2690 R = Context.getFunctionType(ConvType, 0, 0, false, 2691 R->getAs<FunctionProtoType>()->getTypeQuals()); 2692 2693 // C++0x explicit conversion operators. 2694 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2695 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2696 diag::warn_explicit_conversion_functions) 2697 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2698} 2699 2700/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2701/// the declaration of the given C++ conversion function. This routine 2702/// is responsible for recording the conversion function in the C++ 2703/// class, if possible. 2704Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2705 assert(Conversion && "Expected to receive a conversion function declaration"); 2706 2707 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2708 2709 // Make sure we aren't redeclaring the conversion function. 2710 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2711 2712 // C++ [class.conv.fct]p1: 2713 // [...] A conversion function is never used to convert a 2714 // (possibly cv-qualified) object to the (possibly cv-qualified) 2715 // same object type (or a reference to it), to a (possibly 2716 // cv-qualified) base class of that type (or a reference to it), 2717 // or to (possibly cv-qualified) void. 2718 // FIXME: Suppress this warning if the conversion function ends up being a 2719 // virtual function that overrides a virtual function in a base class. 2720 QualType ClassType 2721 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2722 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2723 ConvType = ConvTypeRef->getPointeeType(); 2724 if (ConvType->isRecordType()) { 2725 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2726 if (ConvType == ClassType) 2727 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2728 << ClassType; 2729 else if (IsDerivedFrom(ClassType, ConvType)) 2730 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2731 << ClassType << ConvType; 2732 } else if (ConvType->isVoidType()) { 2733 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2734 << ClassType << ConvType; 2735 } 2736 2737 if (Conversion->getPreviousDeclaration()) { 2738 const NamedDecl *ExpectedPrevDecl = Conversion->getPreviousDeclaration(); 2739 if (FunctionTemplateDecl *ConversionTemplate 2740 = Conversion->getDescribedFunctionTemplate()) 2741 ExpectedPrevDecl = ConversionTemplate->getPreviousDeclaration(); 2742 if (ClassDecl->replaceConversion(ExpectedPrevDecl, Conversion)) 2743 return DeclPtrTy::make(Conversion); 2744 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2745 } else if (FunctionTemplateDecl *ConversionTemplate 2746 = Conversion->getDescribedFunctionTemplate()) 2747 ClassDecl->addConversionFunction(ConversionTemplate); 2748 else if (!Conversion->getPrimaryTemplate()) // ignore specializations 2749 ClassDecl->addConversionFunction(Conversion); 2750 2751 return DeclPtrTy::make(Conversion); 2752} 2753 2754//===----------------------------------------------------------------------===// 2755// Namespace Handling 2756//===----------------------------------------------------------------------===// 2757 2758/// ActOnStartNamespaceDef - This is called at the start of a namespace 2759/// definition. 2760Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2761 SourceLocation IdentLoc, 2762 IdentifierInfo *II, 2763 SourceLocation LBrace) { 2764 NamespaceDecl *Namespc = 2765 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2766 Namespc->setLBracLoc(LBrace); 2767 2768 Scope *DeclRegionScope = NamespcScope->getParent(); 2769 2770 if (II) { 2771 // C++ [namespace.def]p2: 2772 // The identifier in an original-namespace-definition shall not have been 2773 // previously defined in the declarative region in which the 2774 // original-namespace-definition appears. The identifier in an 2775 // original-namespace-definition is the name of the namespace. Subsequently 2776 // in that declarative region, it is treated as an original-namespace-name. 2777 2778 NamedDecl *PrevDecl 2779 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2780 ForRedeclaration); 2781 2782 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2783 // This is an extended namespace definition. 2784 // Attach this namespace decl to the chain of extended namespace 2785 // definitions. 2786 OrigNS->setNextNamespace(Namespc); 2787 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2788 2789 // Remove the previous declaration from the scope. 2790 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2791 IdResolver.RemoveDecl(OrigNS); 2792 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2793 } 2794 } else if (PrevDecl) { 2795 // This is an invalid name redefinition. 2796 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2797 << Namespc->getDeclName(); 2798 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2799 Namespc->setInvalidDecl(); 2800 // Continue on to push Namespc as current DeclContext and return it. 2801 } else if (II->isStr("std") && 2802 CurContext->getLookupContext()->isTranslationUnit()) { 2803 // This is the first "real" definition of the namespace "std", so update 2804 // our cache of the "std" namespace to point at this definition. 2805 if (StdNamespace) { 2806 // We had already defined a dummy namespace "std". Link this new 2807 // namespace definition to the dummy namespace "std". 2808 StdNamespace->setNextNamespace(Namespc); 2809 StdNamespace->setLocation(IdentLoc); 2810 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2811 } 2812 2813 // Make our StdNamespace cache point at the first real definition of the 2814 // "std" namespace. 2815 StdNamespace = Namespc; 2816 } 2817 2818 PushOnScopeChains(Namespc, DeclRegionScope); 2819 } else { 2820 // Anonymous namespaces. 2821 assert(Namespc->isAnonymousNamespace()); 2822 CurContext->addDecl(Namespc); 2823 2824 // Link the anonymous namespace into its parent. 2825 NamespaceDecl *PrevDecl; 2826 DeclContext *Parent = CurContext->getLookupContext(); 2827 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 2828 PrevDecl = TU->getAnonymousNamespace(); 2829 TU->setAnonymousNamespace(Namespc); 2830 } else { 2831 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 2832 PrevDecl = ND->getAnonymousNamespace(); 2833 ND->setAnonymousNamespace(Namespc); 2834 } 2835 2836 // Link the anonymous namespace with its previous declaration. 2837 if (PrevDecl) { 2838 assert(PrevDecl->isAnonymousNamespace()); 2839 assert(!PrevDecl->getNextNamespace()); 2840 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 2841 PrevDecl->setNextNamespace(Namespc); 2842 } 2843 2844 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2845 // behaves as if it were replaced by 2846 // namespace unique { /* empty body */ } 2847 // using namespace unique; 2848 // namespace unique { namespace-body } 2849 // where all occurrences of 'unique' in a translation unit are 2850 // replaced by the same identifier and this identifier differs 2851 // from all other identifiers in the entire program. 2852 2853 // We just create the namespace with an empty name and then add an 2854 // implicit using declaration, just like the standard suggests. 2855 // 2856 // CodeGen enforces the "universally unique" aspect by giving all 2857 // declarations semantically contained within an anonymous 2858 // namespace internal linkage. 2859 2860 if (!PrevDecl) { 2861 UsingDirectiveDecl* UD 2862 = UsingDirectiveDecl::Create(Context, CurContext, 2863 /* 'using' */ LBrace, 2864 /* 'namespace' */ SourceLocation(), 2865 /* qualifier */ SourceRange(), 2866 /* NNS */ NULL, 2867 /* identifier */ SourceLocation(), 2868 Namespc, 2869 /* Ancestor */ CurContext); 2870 UD->setImplicit(); 2871 CurContext->addDecl(UD); 2872 } 2873 } 2874 2875 // Although we could have an invalid decl (i.e. the namespace name is a 2876 // redefinition), push it as current DeclContext and try to continue parsing. 2877 // FIXME: We should be able to push Namespc here, so that the each DeclContext 2878 // for the namespace has the declarations that showed up in that particular 2879 // namespace definition. 2880 PushDeclContext(NamespcScope, Namespc); 2881 return DeclPtrTy::make(Namespc); 2882} 2883 2884/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2885/// is a namespace alias, returns the namespace it points to. 2886static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2887 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2888 return AD->getNamespace(); 2889 return dyn_cast_or_null<NamespaceDecl>(D); 2890} 2891 2892/// ActOnFinishNamespaceDef - This callback is called after a namespace is 2893/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 2894void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 2895 Decl *Dcl = D.getAs<Decl>(); 2896 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 2897 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 2898 Namespc->setRBracLoc(RBrace); 2899 PopDeclContext(); 2900} 2901 2902Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 2903 SourceLocation UsingLoc, 2904 SourceLocation NamespcLoc, 2905 const CXXScopeSpec &SS, 2906 SourceLocation IdentLoc, 2907 IdentifierInfo *NamespcName, 2908 AttributeList *AttrList) { 2909 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2910 assert(NamespcName && "Invalid NamespcName."); 2911 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 2912 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2913 2914 UsingDirectiveDecl *UDir = 0; 2915 2916 // Lookup namespace name. 2917 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 2918 LookupParsedName(R, S, &SS); 2919 if (R.isAmbiguous()) 2920 return DeclPtrTy(); 2921 2922 if (!R.empty()) { 2923 NamedDecl *Named = R.getFoundDecl(); 2924 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 2925 && "expected namespace decl"); 2926 // C++ [namespace.udir]p1: 2927 // A using-directive specifies that the names in the nominated 2928 // namespace can be used in the scope in which the 2929 // using-directive appears after the using-directive. During 2930 // unqualified name lookup (3.4.1), the names appear as if they 2931 // were declared in the nearest enclosing namespace which 2932 // contains both the using-directive and the nominated 2933 // namespace. [Note: in this context, "contains" means "contains 2934 // directly or indirectly". ] 2935 2936 // Find enclosing context containing both using-directive and 2937 // nominated namespace. 2938 NamespaceDecl *NS = getNamespaceDecl(Named); 2939 DeclContext *CommonAncestor = cast<DeclContext>(NS); 2940 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 2941 CommonAncestor = CommonAncestor->getParent(); 2942 2943 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 2944 SS.getRange(), 2945 (NestedNameSpecifier *)SS.getScopeRep(), 2946 IdentLoc, Named, CommonAncestor); 2947 PushUsingDirective(S, UDir); 2948 } else { 2949 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 2950 } 2951 2952 // FIXME: We ignore attributes for now. 2953 delete AttrList; 2954 return DeclPtrTy::make(UDir); 2955} 2956 2957void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2958 // If scope has associated entity, then using directive is at namespace 2959 // or translation unit scope. We add UsingDirectiveDecls, into 2960 // it's lookup structure. 2961 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2962 Ctx->addDecl(UDir); 2963 else 2964 // Otherwise it is block-sope. using-directives will affect lookup 2965 // only to the end of scope. 2966 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2967} 2968 2969 2970Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2971 AccessSpecifier AS, 2972 bool HasUsingKeyword, 2973 SourceLocation UsingLoc, 2974 const CXXScopeSpec &SS, 2975 UnqualifiedId &Name, 2976 AttributeList *AttrList, 2977 bool IsTypeName, 2978 SourceLocation TypenameLoc) { 2979 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2980 2981 switch (Name.getKind()) { 2982 case UnqualifiedId::IK_Identifier: 2983 case UnqualifiedId::IK_OperatorFunctionId: 2984 case UnqualifiedId::IK_LiteralOperatorId: 2985 case UnqualifiedId::IK_ConversionFunctionId: 2986 break; 2987 2988 case UnqualifiedId::IK_ConstructorName: 2989 // C++0x inherited constructors. 2990 if (getLangOptions().CPlusPlus0x) break; 2991 2992 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 2993 << SS.getRange(); 2994 return DeclPtrTy(); 2995 2996 case UnqualifiedId::IK_DestructorName: 2997 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 2998 << SS.getRange(); 2999 return DeclPtrTy(); 3000 3001 case UnqualifiedId::IK_TemplateId: 3002 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3003 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3004 return DeclPtrTy(); 3005 } 3006 3007 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3008 if (!TargetName) 3009 return DeclPtrTy(); 3010 3011 // Warn about using declarations. 3012 // TODO: store that the declaration was written without 'using' and 3013 // talk about access decls instead of using decls in the 3014 // diagnostics. 3015 if (!HasUsingKeyword) { 3016 UsingLoc = Name.getSourceRange().getBegin(); 3017 3018 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3019 << CodeModificationHint::CreateInsertion(SS.getRange().getBegin(), 3020 "using "); 3021 } 3022 3023 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3024 Name.getSourceRange().getBegin(), 3025 TargetName, AttrList, 3026 /* IsInstantiation */ false, 3027 IsTypeName, TypenameLoc); 3028 if (UD) 3029 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3030 3031 return DeclPtrTy::make(UD); 3032} 3033 3034/// Determines whether to create a using shadow decl for a particular 3035/// decl, given the set of decls existing prior to this using lookup. 3036bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3037 const LookupResult &Previous) { 3038 // Diagnose finding a decl which is not from a base class of the 3039 // current class. We do this now because there are cases where this 3040 // function will silently decide not to build a shadow decl, which 3041 // will pre-empt further diagnostics. 3042 // 3043 // We don't need to do this in C++0x because we do the check once on 3044 // the qualifier. 3045 // 3046 // FIXME: diagnose the following if we care enough: 3047 // struct A { int foo; }; 3048 // struct B : A { using A::foo; }; 3049 // template <class T> struct C : A {}; 3050 // template <class T> struct D : C<T> { using B::foo; } // <--- 3051 // This is invalid (during instantiation) in C++03 because B::foo 3052 // resolves to the using decl in B, which is not a base class of D<T>. 3053 // We can't diagnose it immediately because C<T> is an unknown 3054 // specialization. The UsingShadowDecl in D<T> then points directly 3055 // to A::foo, which will look well-formed when we instantiate. 3056 // The right solution is to not collapse the shadow-decl chain. 3057 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3058 DeclContext *OrigDC = Orig->getDeclContext(); 3059 3060 // Handle enums and anonymous structs. 3061 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3062 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3063 while (OrigRec->isAnonymousStructOrUnion()) 3064 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3065 3066 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3067 if (OrigDC == CurContext) { 3068 Diag(Using->getLocation(), 3069 diag::err_using_decl_nested_name_specifier_is_current_class) 3070 << Using->getNestedNameRange(); 3071 Diag(Orig->getLocation(), diag::note_using_decl_target); 3072 return true; 3073 } 3074 3075 Diag(Using->getNestedNameRange().getBegin(), 3076 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3077 << Using->getTargetNestedNameDecl() 3078 << cast<CXXRecordDecl>(CurContext) 3079 << Using->getNestedNameRange(); 3080 Diag(Orig->getLocation(), diag::note_using_decl_target); 3081 return true; 3082 } 3083 } 3084 3085 if (Previous.empty()) return false; 3086 3087 NamedDecl *Target = Orig; 3088 if (isa<UsingShadowDecl>(Target)) 3089 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3090 3091 // If the target happens to be one of the previous declarations, we 3092 // don't have a conflict. 3093 // 3094 // FIXME: but we might be increasing its access, in which case we 3095 // should redeclare it. 3096 NamedDecl *NonTag = 0, *Tag = 0; 3097 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3098 I != E; ++I) { 3099 NamedDecl *D = (*I)->getUnderlyingDecl(); 3100 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3101 return false; 3102 3103 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3104 } 3105 3106 if (Target->isFunctionOrFunctionTemplate()) { 3107 FunctionDecl *FD; 3108 if (isa<FunctionTemplateDecl>(Target)) 3109 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3110 else 3111 FD = cast<FunctionDecl>(Target); 3112 3113 NamedDecl *OldDecl = 0; 3114 switch (CheckOverload(FD, Previous, OldDecl)) { 3115 case Ovl_Overload: 3116 return false; 3117 3118 case Ovl_NonFunction: 3119 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3120 break; 3121 3122 // We found a decl with the exact signature. 3123 case Ovl_Match: 3124 if (isa<UsingShadowDecl>(OldDecl)) { 3125 // Silently ignore the possible conflict. 3126 return false; 3127 } 3128 3129 // If we're in a record, we want to hide the target, so we 3130 // return true (without a diagnostic) to tell the caller not to 3131 // build a shadow decl. 3132 if (CurContext->isRecord()) 3133 return true; 3134 3135 // If we're not in a record, this is an error. 3136 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3137 break; 3138 } 3139 3140 Diag(Target->getLocation(), diag::note_using_decl_target); 3141 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3142 return true; 3143 } 3144 3145 // Target is not a function. 3146 3147 if (isa<TagDecl>(Target)) { 3148 // No conflict between a tag and a non-tag. 3149 if (!Tag) return false; 3150 3151 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3152 Diag(Target->getLocation(), diag::note_using_decl_target); 3153 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3154 return true; 3155 } 3156 3157 // No conflict between a tag and a non-tag. 3158 if (!NonTag) return false; 3159 3160 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3161 Diag(Target->getLocation(), diag::note_using_decl_target); 3162 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3163 return true; 3164} 3165 3166/// Builds a shadow declaration corresponding to a 'using' declaration. 3167UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3168 UsingDecl *UD, 3169 NamedDecl *Orig) { 3170 3171 // If we resolved to another shadow declaration, just coalesce them. 3172 NamedDecl *Target = Orig; 3173 if (isa<UsingShadowDecl>(Target)) { 3174 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3175 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3176 } 3177 3178 UsingShadowDecl *Shadow 3179 = UsingShadowDecl::Create(Context, CurContext, 3180 UD->getLocation(), UD, Target); 3181 UD->addShadowDecl(Shadow); 3182 3183 if (S) 3184 PushOnScopeChains(Shadow, S); 3185 else 3186 CurContext->addDecl(Shadow); 3187 Shadow->setAccess(UD->getAccess()); 3188 3189 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3190 Shadow->setInvalidDecl(); 3191 3192 return Shadow; 3193} 3194 3195/// Hides a using shadow declaration. This is required by the current 3196/// using-decl implementation when a resolvable using declaration in a 3197/// class is followed by a declaration which would hide or override 3198/// one or more of the using decl's targets; for example: 3199/// 3200/// struct Base { void foo(int); }; 3201/// struct Derived : Base { 3202/// using Base::foo; 3203/// void foo(int); 3204/// }; 3205/// 3206/// The governing language is C++03 [namespace.udecl]p12: 3207/// 3208/// When a using-declaration brings names from a base class into a 3209/// derived class scope, member functions in the derived class 3210/// override and/or hide member functions with the same name and 3211/// parameter types in a base class (rather than conflicting). 3212/// 3213/// There are two ways to implement this: 3214/// (1) optimistically create shadow decls when they're not hidden 3215/// by existing declarations, or 3216/// (2) don't create any shadow decls (or at least don't make them 3217/// visible) until we've fully parsed/instantiated the class. 3218/// The problem with (1) is that we might have to retroactively remove 3219/// a shadow decl, which requires several O(n) operations because the 3220/// decl structures are (very reasonably) not designed for removal. 3221/// (2) avoids this but is very fiddly and phase-dependent. 3222void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3223 // Remove it from the DeclContext... 3224 Shadow->getDeclContext()->removeDecl(Shadow); 3225 3226 // ...and the scope, if applicable... 3227 if (S) { 3228 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3229 IdResolver.RemoveDecl(Shadow); 3230 } 3231 3232 // ...and the using decl. 3233 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3234 3235 // TODO: complain somehow if Shadow was used. It shouldn't 3236 // be possible for this to happen, because 3237} 3238 3239/// Builds a using declaration. 3240/// 3241/// \param IsInstantiation - Whether this call arises from an 3242/// instantiation of an unresolved using declaration. We treat 3243/// the lookup differently for these declarations. 3244NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3245 SourceLocation UsingLoc, 3246 const CXXScopeSpec &SS, 3247 SourceLocation IdentLoc, 3248 DeclarationName Name, 3249 AttributeList *AttrList, 3250 bool IsInstantiation, 3251 bool IsTypeName, 3252 SourceLocation TypenameLoc) { 3253 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3254 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3255 3256 // FIXME: We ignore attributes for now. 3257 delete AttrList; 3258 3259 if (SS.isEmpty()) { 3260 Diag(IdentLoc, diag::err_using_requires_qualname); 3261 return 0; 3262 } 3263 3264 // Do the redeclaration lookup in the current scope. 3265 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3266 ForRedeclaration); 3267 Previous.setHideTags(false); 3268 if (S) { 3269 LookupName(Previous, S); 3270 3271 // It is really dumb that we have to do this. 3272 LookupResult::Filter F = Previous.makeFilter(); 3273 while (F.hasNext()) { 3274 NamedDecl *D = F.next(); 3275 if (!isDeclInScope(D, CurContext, S)) 3276 F.erase(); 3277 } 3278 F.done(); 3279 } else { 3280 assert(IsInstantiation && "no scope in non-instantiation"); 3281 assert(CurContext->isRecord() && "scope not record in instantiation"); 3282 LookupQualifiedName(Previous, CurContext); 3283 } 3284 3285 NestedNameSpecifier *NNS = 3286 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3287 3288 // Check for invalid redeclarations. 3289 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3290 return 0; 3291 3292 // Check for bad qualifiers. 3293 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3294 return 0; 3295 3296 DeclContext *LookupContext = computeDeclContext(SS); 3297 NamedDecl *D; 3298 if (!LookupContext) { 3299 if (IsTypeName) { 3300 // FIXME: not all declaration name kinds are legal here 3301 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3302 UsingLoc, TypenameLoc, 3303 SS.getRange(), NNS, 3304 IdentLoc, Name); 3305 } else { 3306 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3307 UsingLoc, SS.getRange(), NNS, 3308 IdentLoc, Name); 3309 } 3310 } else { 3311 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3312 SS.getRange(), UsingLoc, NNS, Name, 3313 IsTypeName); 3314 } 3315 D->setAccess(AS); 3316 CurContext->addDecl(D); 3317 3318 if (!LookupContext) return D; 3319 UsingDecl *UD = cast<UsingDecl>(D); 3320 3321 if (RequireCompleteDeclContext(SS)) { 3322 UD->setInvalidDecl(); 3323 return UD; 3324 } 3325 3326 // Look up the target name. 3327 3328 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3329 3330 // Unlike most lookups, we don't always want to hide tag 3331 // declarations: tag names are visible through the using declaration 3332 // even if hidden by ordinary names, *except* in a dependent context 3333 // where it's important for the sanity of two-phase lookup. 3334 if (!IsInstantiation) 3335 R.setHideTags(false); 3336 3337 LookupQualifiedName(R, LookupContext); 3338 3339 if (R.empty()) { 3340 Diag(IdentLoc, diag::err_no_member) 3341 << Name << LookupContext << SS.getRange(); 3342 UD->setInvalidDecl(); 3343 return UD; 3344 } 3345 3346 if (R.isAmbiguous()) { 3347 UD->setInvalidDecl(); 3348 return UD; 3349 } 3350 3351 if (IsTypeName) { 3352 // If we asked for a typename and got a non-type decl, error out. 3353 if (!R.getAsSingle<TypeDecl>()) { 3354 Diag(IdentLoc, diag::err_using_typename_non_type); 3355 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3356 Diag((*I)->getUnderlyingDecl()->getLocation(), 3357 diag::note_using_decl_target); 3358 UD->setInvalidDecl(); 3359 return UD; 3360 } 3361 } else { 3362 // If we asked for a non-typename and we got a type, error out, 3363 // but only if this is an instantiation of an unresolved using 3364 // decl. Otherwise just silently find the type name. 3365 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3366 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3367 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3368 UD->setInvalidDecl(); 3369 return UD; 3370 } 3371 } 3372 3373 // C++0x N2914 [namespace.udecl]p6: 3374 // A using-declaration shall not name a namespace. 3375 if (R.getAsSingle<NamespaceDecl>()) { 3376 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3377 << SS.getRange(); 3378 UD->setInvalidDecl(); 3379 return UD; 3380 } 3381 3382 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3383 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3384 BuildUsingShadowDecl(S, UD, *I); 3385 } 3386 3387 return UD; 3388} 3389 3390/// Checks that the given using declaration is not an invalid 3391/// redeclaration. Note that this is checking only for the using decl 3392/// itself, not for any ill-formedness among the UsingShadowDecls. 3393bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3394 bool isTypeName, 3395 const CXXScopeSpec &SS, 3396 SourceLocation NameLoc, 3397 const LookupResult &Prev) { 3398 // C++03 [namespace.udecl]p8: 3399 // C++0x [namespace.udecl]p10: 3400 // A using-declaration is a declaration and can therefore be used 3401 // repeatedly where (and only where) multiple declarations are 3402 // allowed. 3403 // That's only in file contexts. 3404 if (CurContext->getLookupContext()->isFileContext()) 3405 return false; 3406 3407 NestedNameSpecifier *Qual 3408 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3409 3410 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3411 NamedDecl *D = *I; 3412 3413 bool DTypename; 3414 NestedNameSpecifier *DQual; 3415 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3416 DTypename = UD->isTypeName(); 3417 DQual = UD->getTargetNestedNameDecl(); 3418 } else if (UnresolvedUsingValueDecl *UD 3419 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3420 DTypename = false; 3421 DQual = UD->getTargetNestedNameSpecifier(); 3422 } else if (UnresolvedUsingTypenameDecl *UD 3423 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3424 DTypename = true; 3425 DQual = UD->getTargetNestedNameSpecifier(); 3426 } else continue; 3427 3428 // using decls differ if one says 'typename' and the other doesn't. 3429 // FIXME: non-dependent using decls? 3430 if (isTypeName != DTypename) continue; 3431 3432 // using decls differ if they name different scopes (but note that 3433 // template instantiation can cause this check to trigger when it 3434 // didn't before instantiation). 3435 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3436 Context.getCanonicalNestedNameSpecifier(DQual)) 3437 continue; 3438 3439 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3440 Diag(D->getLocation(), diag::note_using_decl) << 1; 3441 return true; 3442 } 3443 3444 return false; 3445} 3446 3447 3448/// Checks that the given nested-name qualifier used in a using decl 3449/// in the current context is appropriately related to the current 3450/// scope. If an error is found, diagnoses it and returns true. 3451bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3452 const CXXScopeSpec &SS, 3453 SourceLocation NameLoc) { 3454 DeclContext *NamedContext = computeDeclContext(SS); 3455 3456 if (!CurContext->isRecord()) { 3457 // C++03 [namespace.udecl]p3: 3458 // C++0x [namespace.udecl]p8: 3459 // A using-declaration for a class member shall be a member-declaration. 3460 3461 // If we weren't able to compute a valid scope, it must be a 3462 // dependent class scope. 3463 if (!NamedContext || NamedContext->isRecord()) { 3464 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3465 << SS.getRange(); 3466 return true; 3467 } 3468 3469 // Otherwise, everything is known to be fine. 3470 return false; 3471 } 3472 3473 // The current scope is a record. 3474 3475 // If the named context is dependent, we can't decide much. 3476 if (!NamedContext) { 3477 // FIXME: in C++0x, we can diagnose if we can prove that the 3478 // nested-name-specifier does not refer to a base class, which is 3479 // still possible in some cases. 3480 3481 // Otherwise we have to conservatively report that things might be 3482 // okay. 3483 return false; 3484 } 3485 3486 if (!NamedContext->isRecord()) { 3487 // Ideally this would point at the last name in the specifier, 3488 // but we don't have that level of source info. 3489 Diag(SS.getRange().getBegin(), 3490 diag::err_using_decl_nested_name_specifier_is_not_class) 3491 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3492 return true; 3493 } 3494 3495 if (getLangOptions().CPlusPlus0x) { 3496 // C++0x [namespace.udecl]p3: 3497 // In a using-declaration used as a member-declaration, the 3498 // nested-name-specifier shall name a base class of the class 3499 // being defined. 3500 3501 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3502 cast<CXXRecordDecl>(NamedContext))) { 3503 if (CurContext == NamedContext) { 3504 Diag(NameLoc, 3505 diag::err_using_decl_nested_name_specifier_is_current_class) 3506 << SS.getRange(); 3507 return true; 3508 } 3509 3510 Diag(SS.getRange().getBegin(), 3511 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3512 << (NestedNameSpecifier*) SS.getScopeRep() 3513 << cast<CXXRecordDecl>(CurContext) 3514 << SS.getRange(); 3515 return true; 3516 } 3517 3518 return false; 3519 } 3520 3521 // C++03 [namespace.udecl]p4: 3522 // A using-declaration used as a member-declaration shall refer 3523 // to a member of a base class of the class being defined [etc.]. 3524 3525 // Salient point: SS doesn't have to name a base class as long as 3526 // lookup only finds members from base classes. Therefore we can 3527 // diagnose here only if we can prove that that can't happen, 3528 // i.e. if the class hierarchies provably don't intersect. 3529 3530 // TODO: it would be nice if "definitely valid" results were cached 3531 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3532 // need to be repeated. 3533 3534 struct UserData { 3535 llvm::DenseSet<const CXXRecordDecl*> Bases; 3536 3537 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3538 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3539 Data->Bases.insert(Base); 3540 return true; 3541 } 3542 3543 bool hasDependentBases(const CXXRecordDecl *Class) { 3544 return !Class->forallBases(collect, this); 3545 } 3546 3547 /// Returns true if the base is dependent or is one of the 3548 /// accumulated base classes. 3549 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3550 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3551 return !Data->Bases.count(Base); 3552 } 3553 3554 bool mightShareBases(const CXXRecordDecl *Class) { 3555 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3556 } 3557 }; 3558 3559 UserData Data; 3560 3561 // Returns false if we find a dependent base. 3562 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3563 return false; 3564 3565 // Returns false if the class has a dependent base or if it or one 3566 // of its bases is present in the base set of the current context. 3567 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3568 return false; 3569 3570 Diag(SS.getRange().getBegin(), 3571 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3572 << (NestedNameSpecifier*) SS.getScopeRep() 3573 << cast<CXXRecordDecl>(CurContext) 3574 << SS.getRange(); 3575 3576 return true; 3577} 3578 3579Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3580 SourceLocation NamespaceLoc, 3581 SourceLocation AliasLoc, 3582 IdentifierInfo *Alias, 3583 const CXXScopeSpec &SS, 3584 SourceLocation IdentLoc, 3585 IdentifierInfo *Ident) { 3586 3587 // Lookup the namespace name. 3588 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3589 LookupParsedName(R, S, &SS); 3590 3591 // Check if we have a previous declaration with the same name. 3592 if (NamedDecl *PrevDecl 3593 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3594 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3595 // We already have an alias with the same name that points to the same 3596 // namespace, so don't create a new one. 3597 if (!R.isAmbiguous() && !R.empty() && 3598 AD->getNamespace() == getNamespaceDecl(R.getFoundDecl())) 3599 return DeclPtrTy(); 3600 } 3601 3602 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3603 diag::err_redefinition_different_kind; 3604 Diag(AliasLoc, DiagID) << Alias; 3605 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3606 return DeclPtrTy(); 3607 } 3608 3609 if (R.isAmbiguous()) 3610 return DeclPtrTy(); 3611 3612 if (R.empty()) { 3613 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3614 return DeclPtrTy(); 3615 } 3616 3617 NamespaceAliasDecl *AliasDecl = 3618 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3619 Alias, SS.getRange(), 3620 (NestedNameSpecifier *)SS.getScopeRep(), 3621 IdentLoc, R.getFoundDecl()); 3622 3623 CurContext->addDecl(AliasDecl); 3624 return DeclPtrTy::make(AliasDecl); 3625} 3626 3627void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3628 CXXConstructorDecl *Constructor) { 3629 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3630 !Constructor->isUsed()) && 3631 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3632 3633 CXXRecordDecl *ClassDecl 3634 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3635 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3636 3637 if (SetBaseOrMemberInitializers(Constructor, 0, 0, true)) { 3638 Diag(CurrentLocation, diag::note_member_synthesized_at) 3639 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 3640 Constructor->setInvalidDecl(); 3641 } else { 3642 Constructor->setUsed(); 3643 } 3644} 3645 3646void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3647 CXXDestructorDecl *Destructor) { 3648 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3649 "DefineImplicitDestructor - call it for implicit default dtor"); 3650 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3651 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3652 // C++ [class.dtor] p5 3653 // Before the implicitly-declared default destructor for a class is 3654 // implicitly defined, all the implicitly-declared default destructors 3655 // for its base class and its non-static data members shall have been 3656 // implicitly defined. 3657 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3658 E = ClassDecl->bases_end(); Base != E; ++Base) { 3659 CXXRecordDecl *BaseClassDecl 3660 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3661 if (!BaseClassDecl->hasTrivialDestructor()) { 3662 if (CXXDestructorDecl *BaseDtor = 3663 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 3664 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 3665 else 3666 assert(false && 3667 "DefineImplicitDestructor - missing dtor in a base class"); 3668 } 3669 } 3670 3671 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3672 E = ClassDecl->field_end(); Field != E; ++Field) { 3673 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3674 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3675 FieldType = Array->getElementType(); 3676 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3677 CXXRecordDecl *FieldClassDecl 3678 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3679 if (!FieldClassDecl->hasTrivialDestructor()) { 3680 if (CXXDestructorDecl *FieldDtor = 3681 const_cast<CXXDestructorDecl*>( 3682 FieldClassDecl->getDestructor(Context))) 3683 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 3684 else 3685 assert(false && 3686 "DefineImplicitDestructor - missing dtor in class of a data member"); 3687 } 3688 } 3689 } 3690 3691 // FIXME: If CheckDestructor fails, we should emit a note about where the 3692 // implicit destructor was needed. 3693 if (CheckDestructor(Destructor)) { 3694 Diag(CurrentLocation, diag::note_member_synthesized_at) 3695 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3696 3697 Destructor->setInvalidDecl(); 3698 return; 3699 } 3700 3701 Destructor->setUsed(); 3702} 3703 3704void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3705 CXXMethodDecl *MethodDecl) { 3706 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3707 MethodDecl->getOverloadedOperator() == OO_Equal && 3708 !MethodDecl->isUsed()) && 3709 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3710 3711 CXXRecordDecl *ClassDecl 3712 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3713 3714 // C++[class.copy] p12 3715 // Before the implicitly-declared copy assignment operator for a class is 3716 // implicitly defined, all implicitly-declared copy assignment operators 3717 // for its direct base classes and its nonstatic data members shall have 3718 // been implicitly defined. 3719 bool err = false; 3720 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3721 E = ClassDecl->bases_end(); Base != E; ++Base) { 3722 CXXRecordDecl *BaseClassDecl 3723 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3724 if (CXXMethodDecl *BaseAssignOpMethod = 3725 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3726 BaseClassDecl)) 3727 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3728 } 3729 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3730 E = ClassDecl->field_end(); Field != E; ++Field) { 3731 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3732 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3733 FieldType = Array->getElementType(); 3734 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3735 CXXRecordDecl *FieldClassDecl 3736 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3737 if (CXXMethodDecl *FieldAssignOpMethod = 3738 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3739 FieldClassDecl)) 3740 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3741 } else if (FieldType->isReferenceType()) { 3742 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3743 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3744 Diag(Field->getLocation(), diag::note_declared_at); 3745 Diag(CurrentLocation, diag::note_first_required_here); 3746 err = true; 3747 } else if (FieldType.isConstQualified()) { 3748 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3749 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3750 Diag(Field->getLocation(), diag::note_declared_at); 3751 Diag(CurrentLocation, diag::note_first_required_here); 3752 err = true; 3753 } 3754 } 3755 if (!err) 3756 MethodDecl->setUsed(); 3757} 3758 3759CXXMethodDecl * 3760Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 3761 ParmVarDecl *ParmDecl, 3762 CXXRecordDecl *ClassDecl) { 3763 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3764 QualType RHSType(LHSType); 3765 // If class's assignment operator argument is const/volatile qualified, 3766 // look for operator = (const/volatile B&). Otherwise, look for 3767 // operator = (B&). 3768 RHSType = Context.getCVRQualifiedType(RHSType, 3769 ParmDecl->getType().getCVRQualifiers()); 3770 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3771 LHSType, 3772 SourceLocation())); 3773 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3774 RHSType, 3775 CurrentLocation)); 3776 Expr *Args[2] = { &*LHS, &*RHS }; 3777 OverloadCandidateSet CandidateSet; 3778 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3779 CandidateSet); 3780 OverloadCandidateSet::iterator Best; 3781 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 3782 return cast<CXXMethodDecl>(Best->Function); 3783 assert(false && 3784 "getAssignOperatorMethod - copy assignment operator method not found"); 3785 return 0; 3786} 3787 3788void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3789 CXXConstructorDecl *CopyConstructor, 3790 unsigned TypeQuals) { 3791 assert((CopyConstructor->isImplicit() && 3792 CopyConstructor->isCopyConstructor(TypeQuals) && 3793 !CopyConstructor->isUsed()) && 3794 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3795 3796 CXXRecordDecl *ClassDecl 3797 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3798 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3799 // C++ [class.copy] p209 3800 // Before the implicitly-declared copy constructor for a class is 3801 // implicitly defined, all the implicitly-declared copy constructors 3802 // for its base class and its non-static data members shall have been 3803 // implicitly defined. 3804 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3805 Base != ClassDecl->bases_end(); ++Base) { 3806 CXXRecordDecl *BaseClassDecl 3807 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3808 if (CXXConstructorDecl *BaseCopyCtor = 3809 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 3810 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3811 } 3812 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3813 FieldEnd = ClassDecl->field_end(); 3814 Field != FieldEnd; ++Field) { 3815 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3816 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3817 FieldType = Array->getElementType(); 3818 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3819 CXXRecordDecl *FieldClassDecl 3820 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3821 if (CXXConstructorDecl *FieldCopyCtor = 3822 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 3823 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3824 } 3825 } 3826 CopyConstructor->setUsed(); 3827} 3828 3829Sema::OwningExprResult 3830Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3831 CXXConstructorDecl *Constructor, 3832 MultiExprArg ExprArgs, 3833 bool RequiresZeroInit) { 3834 bool Elidable = false; 3835 3836 // C++ [class.copy]p15: 3837 // Whenever a temporary class object is copied using a copy constructor, and 3838 // this object and the copy have the same cv-unqualified type, an 3839 // implementation is permitted to treat the original and the copy as two 3840 // different ways of referring to the same object and not perform a copy at 3841 // all, even if the class copy constructor or destructor have side effects. 3842 3843 // FIXME: Is this enough? 3844 if (Constructor->isCopyConstructor()) { 3845 Expr *E = ((Expr **)ExprArgs.get())[0]; 3846 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3847 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3848 E = ICE->getSubExpr(); 3849 if (CXXFunctionalCastExpr *FCE = dyn_cast<CXXFunctionalCastExpr>(E)) 3850 E = FCE->getSubExpr(); 3851 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 3852 E = BE->getSubExpr(); 3853 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3854 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3855 E = ICE->getSubExpr(); 3856 3857 if (CallExpr *CE = dyn_cast<CallExpr>(E)) 3858 Elidable = !CE->getCallReturnType()->isReferenceType(); 3859 else if (isa<CXXTemporaryObjectExpr>(E)) 3860 Elidable = true; 3861 else if (isa<CXXConstructExpr>(E)) 3862 Elidable = true; 3863 } 3864 3865 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 3866 Elidable, move(ExprArgs), RequiresZeroInit); 3867} 3868 3869/// BuildCXXConstructExpr - Creates a complete call to a constructor, 3870/// including handling of its default argument expressions. 3871Sema::OwningExprResult 3872Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3873 CXXConstructorDecl *Constructor, bool Elidable, 3874 MultiExprArg ExprArgs, 3875 bool RequiresZeroInit) { 3876 unsigned NumExprs = ExprArgs.size(); 3877 Expr **Exprs = (Expr **)ExprArgs.release(); 3878 3879 MarkDeclarationReferenced(ConstructLoc, Constructor); 3880 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 3881 Constructor, Elidable, Exprs, NumExprs, 3882 RequiresZeroInit)); 3883} 3884 3885Sema::OwningExprResult 3886Sema::BuildCXXTemporaryObjectExpr(CXXConstructorDecl *Constructor, 3887 QualType Ty, 3888 SourceLocation TyBeginLoc, 3889 MultiExprArg Args, 3890 SourceLocation RParenLoc) { 3891 unsigned NumExprs = Args.size(); 3892 Expr **Exprs = (Expr **)Args.release(); 3893 3894 MarkDeclarationReferenced(TyBeginLoc, Constructor); 3895 return Owned(new (Context) CXXTemporaryObjectExpr(Context, Constructor, Ty, 3896 TyBeginLoc, Exprs, 3897 NumExprs, RParenLoc)); 3898} 3899 3900 3901bool Sema::InitializeVarWithConstructor(VarDecl *VD, 3902 CXXConstructorDecl *Constructor, 3903 MultiExprArg Exprs) { 3904 OwningExprResult TempResult = 3905 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 3906 move(Exprs)); 3907 if (TempResult.isInvalid()) 3908 return true; 3909 3910 Expr *Temp = TempResult.takeAs<Expr>(); 3911 MarkDeclarationReferenced(VD->getLocation(), Constructor); 3912 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 3913 VD->setInit(Context, Temp); 3914 3915 return false; 3916} 3917 3918void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) { 3919 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 3920 DeclInitType->getAs<RecordType>()->getDecl()); 3921 if (!ClassDecl->hasTrivialDestructor()) 3922 if (CXXDestructorDecl *Destructor = 3923 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 3924 MarkDeclarationReferenced(VD->getLocation(), Destructor); 3925} 3926 3927/// AddCXXDirectInitializerToDecl - This action is called immediately after 3928/// ActOnDeclarator, when a C++ direct initializer is present. 3929/// e.g: "int x(1);" 3930void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 3931 SourceLocation LParenLoc, 3932 MultiExprArg Exprs, 3933 SourceLocation *CommaLocs, 3934 SourceLocation RParenLoc) { 3935 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 3936 Decl *RealDecl = Dcl.getAs<Decl>(); 3937 3938 // If there is no declaration, there was an error parsing it. Just ignore 3939 // the initializer. 3940 if (RealDecl == 0) 3941 return; 3942 3943 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3944 if (!VDecl) { 3945 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3946 RealDecl->setInvalidDecl(); 3947 return; 3948 } 3949 3950 // We will represent direct-initialization similarly to copy-initialization: 3951 // int x(1); -as-> int x = 1; 3952 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 3953 // 3954 // Clients that want to distinguish between the two forms, can check for 3955 // direct initializer using VarDecl::hasCXXDirectInitializer(). 3956 // A major benefit is that clients that don't particularly care about which 3957 // exactly form was it (like the CodeGen) can handle both cases without 3958 // special case code. 3959 3960 // If either the declaration has a dependent type or if any of the expressions 3961 // is type-dependent, we represent the initialization via a ParenListExpr for 3962 // later use during template instantiation. 3963 if (VDecl->getType()->isDependentType() || 3964 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 3965 // Let clients know that initialization was done with a direct initializer. 3966 VDecl->setCXXDirectInitializer(true); 3967 3968 // Store the initialization expressions as a ParenListExpr. 3969 unsigned NumExprs = Exprs.size(); 3970 VDecl->setInit(Context, 3971 new (Context) ParenListExpr(Context, LParenLoc, 3972 (Expr **)Exprs.release(), 3973 NumExprs, RParenLoc)); 3974 return; 3975 } 3976 3977 3978 // C++ 8.5p11: 3979 // The form of initialization (using parentheses or '=') is generally 3980 // insignificant, but does matter when the entity being initialized has a 3981 // class type. 3982 QualType DeclInitType = VDecl->getType(); 3983 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 3984 DeclInitType = Context.getBaseElementType(Array); 3985 3986 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 3987 diag::err_typecheck_decl_incomplete_type)) { 3988 VDecl->setInvalidDecl(); 3989 return; 3990 } 3991 3992 // The variable can not have an abstract class type. 3993 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 3994 diag::err_abstract_type_in_decl, 3995 AbstractVariableType)) 3996 VDecl->setInvalidDecl(); 3997 3998 const VarDecl *Def = 0; 3999 if (VDecl->getDefinition(Def)) { 4000 Diag(VDecl->getLocation(), diag::err_redefinition) 4001 << VDecl->getDeclName(); 4002 Diag(Def->getLocation(), diag::note_previous_definition); 4003 VDecl->setInvalidDecl(); 4004 return; 4005 } 4006 4007 // Capture the variable that is being initialized and the style of 4008 // initialization. 4009 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4010 4011 // FIXME: Poor source location information. 4012 InitializationKind Kind 4013 = InitializationKind::CreateDirect(VDecl->getLocation(), 4014 LParenLoc, RParenLoc); 4015 4016 InitializationSequence InitSeq(*this, Entity, Kind, 4017 (Expr**)Exprs.get(), Exprs.size()); 4018 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4019 if (Result.isInvalid()) { 4020 VDecl->setInvalidDecl(); 4021 return; 4022 } 4023 4024 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4025 VDecl->setInit(Context, Result.takeAs<Expr>()); 4026 VDecl->setCXXDirectInitializer(true); 4027 4028 if (VDecl->getType()->getAs<RecordType>()) 4029 FinalizeVarWithDestructor(VDecl, DeclInitType); 4030} 4031 4032/// \brief Add the applicable constructor candidates for an initialization 4033/// by constructor. 4034static void AddConstructorInitializationCandidates(Sema &SemaRef, 4035 QualType ClassType, 4036 Expr **Args, 4037 unsigned NumArgs, 4038 InitializationKind Kind, 4039 OverloadCandidateSet &CandidateSet) { 4040 // C++ [dcl.init]p14: 4041 // If the initialization is direct-initialization, or if it is 4042 // copy-initialization where the cv-unqualified version of the 4043 // source type is the same class as, or a derived class of, the 4044 // class of the destination, constructors are considered. The 4045 // applicable constructors are enumerated (13.3.1.3), and the 4046 // best one is chosen through overload resolution (13.3). The 4047 // constructor so selected is called to initialize the object, 4048 // with the initializer expression(s) as its argument(s). If no 4049 // constructor applies, or the overload resolution is ambiguous, 4050 // the initialization is ill-formed. 4051 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 4052 assert(ClassRec && "Can only initialize a class type here"); 4053 4054 // FIXME: When we decide not to synthesize the implicitly-declared 4055 // constructors, we'll need to make them appear here. 4056 4057 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 4058 DeclarationName ConstructorName 4059 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 4060 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 4061 DeclContext::lookup_const_iterator Con, ConEnd; 4062 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 4063 Con != ConEnd; ++Con) { 4064 // Find the constructor (which may be a template). 4065 CXXConstructorDecl *Constructor = 0; 4066 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 4067 if (ConstructorTmpl) 4068 Constructor 4069 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 4070 else 4071 Constructor = cast<CXXConstructorDecl>(*Con); 4072 4073 if ((Kind.getKind() == InitializationKind::IK_Direct) || 4074 (Kind.getKind() == InitializationKind::IK_Value) || 4075 (Kind.getKind() == InitializationKind::IK_Copy && 4076 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 4077 ((Kind.getKind() == InitializationKind::IK_Default) && 4078 Constructor->isDefaultConstructor())) { 4079 if (ConstructorTmpl) 4080 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, 4081 /*ExplicitArgs*/ 0, 4082 Args, NumArgs, CandidateSet); 4083 else 4084 SemaRef.AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 4085 } 4086 } 4087} 4088 4089/// \brief Attempt to perform initialization by constructor 4090/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 4091/// copy-initialization. 4092/// 4093/// This routine determines whether initialization by constructor is possible, 4094/// but it does not emit any diagnostics in the case where the initialization 4095/// is ill-formed. 4096/// 4097/// \param ClassType the type of the object being initialized, which must have 4098/// class type. 4099/// 4100/// \param Args the arguments provided to initialize the object 4101/// 4102/// \param NumArgs the number of arguments provided to initialize the object 4103/// 4104/// \param Kind the type of initialization being performed 4105/// 4106/// \returns the constructor used to initialize the object, if successful. 4107/// Otherwise, emits a diagnostic and returns NULL. 4108CXXConstructorDecl * 4109Sema::TryInitializationByConstructor(QualType ClassType, 4110 Expr **Args, unsigned NumArgs, 4111 SourceLocation Loc, 4112 InitializationKind Kind) { 4113 // Build the overload candidate set 4114 OverloadCandidateSet CandidateSet; 4115 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4116 CandidateSet); 4117 4118 // Determine whether we found a constructor we can use. 4119 OverloadCandidateSet::iterator Best; 4120 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4121 case OR_Success: 4122 case OR_Deleted: 4123 // We found a constructor. Return it. 4124 return cast<CXXConstructorDecl>(Best->Function); 4125 4126 case OR_No_Viable_Function: 4127 case OR_Ambiguous: 4128 // Overload resolution failed. Return nothing. 4129 return 0; 4130 } 4131 4132 // Silence GCC warning 4133 return 0; 4134} 4135 4136/// \brief Perform initialization by constructor (C++ [dcl.init]p14), which 4137/// may occur as part of direct-initialization or copy-initialization. 4138/// 4139/// \param ClassType the type of the object being initialized, which must have 4140/// class type. 4141/// 4142/// \param ArgsPtr the arguments provided to initialize the object 4143/// 4144/// \param Loc the source location where the initialization occurs 4145/// 4146/// \param Range the source range that covers the entire initialization 4147/// 4148/// \param InitEntity the name of the entity being initialized, if known 4149/// 4150/// \param Kind the type of initialization being performed 4151/// 4152/// \param ConvertedArgs a vector that will be filled in with the 4153/// appropriately-converted arguments to the constructor (if initialization 4154/// succeeded). 4155/// 4156/// \returns the constructor used to initialize the object, if successful. 4157/// Otherwise, emits a diagnostic and returns NULL. 4158CXXConstructorDecl * 4159Sema::PerformInitializationByConstructor(QualType ClassType, 4160 MultiExprArg ArgsPtr, 4161 SourceLocation Loc, SourceRange Range, 4162 DeclarationName InitEntity, 4163 InitializationKind Kind, 4164 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4165 4166 // Build the overload candidate set 4167 Expr **Args = (Expr **)ArgsPtr.get(); 4168 unsigned NumArgs = ArgsPtr.size(); 4169 OverloadCandidateSet CandidateSet; 4170 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4171 CandidateSet); 4172 4173 OverloadCandidateSet::iterator Best; 4174 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4175 case OR_Success: 4176 // We found a constructor. Break out so that we can convert the arguments 4177 // appropriately. 4178 break; 4179 4180 case OR_No_Viable_Function: 4181 if (InitEntity) 4182 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 4183 << InitEntity << Range; 4184 else 4185 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 4186 << ClassType << Range; 4187 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 4188 return 0; 4189 4190 case OR_Ambiguous: 4191 if (InitEntity) 4192 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 4193 else 4194 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 4195 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 4196 return 0; 4197 4198 case OR_Deleted: 4199 if (InitEntity) 4200 Diag(Loc, diag::err_ovl_deleted_init) 4201 << Best->Function->isDeleted() 4202 << InitEntity << Range; 4203 else { 4204 const CXXRecordDecl *RD = 4205 cast<CXXRecordDecl>(ClassType->getAs<RecordType>()->getDecl()); 4206 Diag(Loc, diag::err_ovl_deleted_init) 4207 << Best->Function->isDeleted() 4208 << RD->getDeclName() << Range; 4209 } 4210 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 4211 return 0; 4212 } 4213 4214 // Convert the arguments, fill in default arguments, etc. 4215 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function); 4216 if (CompleteConstructorCall(Constructor, move(ArgsPtr), Loc, ConvertedArgs)) 4217 return 0; 4218 4219 return Constructor; 4220} 4221 4222/// \brief Given a constructor and the set of arguments provided for the 4223/// constructor, convert the arguments and add any required default arguments 4224/// to form a proper call to this constructor. 4225/// 4226/// \returns true if an error occurred, false otherwise. 4227bool 4228Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4229 MultiExprArg ArgsPtr, 4230 SourceLocation Loc, 4231 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4232 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4233 unsigned NumArgs = ArgsPtr.size(); 4234 Expr **Args = (Expr **)ArgsPtr.get(); 4235 4236 const FunctionProtoType *Proto 4237 = Constructor->getType()->getAs<FunctionProtoType>(); 4238 assert(Proto && "Constructor without a prototype?"); 4239 unsigned NumArgsInProto = Proto->getNumArgs(); 4240 4241 // If too few arguments are available, we'll fill in the rest with defaults. 4242 if (NumArgs < NumArgsInProto) 4243 ConvertedArgs.reserve(NumArgsInProto); 4244 else 4245 ConvertedArgs.reserve(NumArgs); 4246 4247 VariadicCallType CallType = 4248 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4249 llvm::SmallVector<Expr *, 8> AllArgs; 4250 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4251 Proto, 0, Args, NumArgs, AllArgs, 4252 CallType); 4253 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4254 ConvertedArgs.push_back(AllArgs[i]); 4255 return Invalid; 4256} 4257 4258/// CompareReferenceRelationship - Compare the two types T1 and T2 to 4259/// determine whether they are reference-related, 4260/// reference-compatible, reference-compatible with added 4261/// qualification, or incompatible, for use in C++ initialization by 4262/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 4263/// type, and the first type (T1) is the pointee type of the reference 4264/// type being initialized. 4265Sema::ReferenceCompareResult 4266Sema::CompareReferenceRelationship(SourceLocation Loc, 4267 QualType OrigT1, QualType OrigT2, 4268 bool& DerivedToBase) { 4269 assert(!OrigT1->isReferenceType() && 4270 "T1 must be the pointee type of the reference type"); 4271 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 4272 4273 QualType T1 = Context.getCanonicalType(OrigT1); 4274 QualType T2 = Context.getCanonicalType(OrigT2); 4275 Qualifiers T1Quals, T2Quals; 4276 QualType UnqualT1 = Context.getUnqualifiedArrayType(T1, T1Quals); 4277 QualType UnqualT2 = Context.getUnqualifiedArrayType(T2, T2Quals); 4278 4279 // C++ [dcl.init.ref]p4: 4280 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 4281 // reference-related to "cv2 T2" if T1 is the same type as T2, or 4282 // T1 is a base class of T2. 4283 if (UnqualT1 == UnqualT2) 4284 DerivedToBase = false; 4285 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 4286 !RequireCompleteType(Loc, OrigT2, PDiag()) && 4287 IsDerivedFrom(UnqualT2, UnqualT1)) 4288 DerivedToBase = true; 4289 else 4290 return Ref_Incompatible; 4291 4292 // At this point, we know that T1 and T2 are reference-related (at 4293 // least). 4294 4295 // If the type is an array type, promote the element qualifiers to the type 4296 // for comparison. 4297 if (isa<ArrayType>(T1) && T1Quals) 4298 T1 = Context.getQualifiedType(UnqualT1, T1Quals); 4299 if (isa<ArrayType>(T2) && T2Quals) 4300 T2 = Context.getQualifiedType(UnqualT2, T2Quals); 4301 4302 // C++ [dcl.init.ref]p4: 4303 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 4304 // reference-related to T2 and cv1 is the same cv-qualification 4305 // as, or greater cv-qualification than, cv2. For purposes of 4306 // overload resolution, cases for which cv1 is greater 4307 // cv-qualification than cv2 are identified as 4308 // reference-compatible with added qualification (see 13.3.3.2). 4309 if (T1Quals.getCVRQualifiers() == T2Quals.getCVRQualifiers()) 4310 return Ref_Compatible; 4311 else if (T1.isMoreQualifiedThan(T2)) 4312 return Ref_Compatible_With_Added_Qualification; 4313 else 4314 return Ref_Related; 4315} 4316 4317/// CheckReferenceInit - Check the initialization of a reference 4318/// variable with the given initializer (C++ [dcl.init.ref]). Init is 4319/// the initializer (either a simple initializer or an initializer 4320/// list), and DeclType is the type of the declaration. When ICS is 4321/// non-null, this routine will compute the implicit conversion 4322/// sequence according to C++ [over.ics.ref] and will not produce any 4323/// diagnostics; when ICS is null, it will emit diagnostics when any 4324/// errors are found. Either way, a return value of true indicates 4325/// that there was a failure, a return value of false indicates that 4326/// the reference initialization succeeded. 4327/// 4328/// When @p SuppressUserConversions, user-defined conversions are 4329/// suppressed. 4330/// When @p AllowExplicit, we also permit explicit user-defined 4331/// conversion functions. 4332/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 4333/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 4334/// This is used when this is called from a C-style cast. 4335bool 4336Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 4337 SourceLocation DeclLoc, 4338 bool SuppressUserConversions, 4339 bool AllowExplicit, bool ForceRValue, 4340 ImplicitConversionSequence *ICS, 4341 bool IgnoreBaseAccess) { 4342 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 4343 4344 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 4345 QualType T2 = Init->getType(); 4346 4347 // If the initializer is the address of an overloaded function, try 4348 // to resolve the overloaded function. If all goes well, T2 is the 4349 // type of the resulting function. 4350 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 4351 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 4352 ICS != 0); 4353 if (Fn) { 4354 // Since we're performing this reference-initialization for 4355 // real, update the initializer with the resulting function. 4356 if (!ICS) { 4357 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 4358 return true; 4359 4360 Init = FixOverloadedFunctionReference(Init, Fn); 4361 } 4362 4363 T2 = Fn->getType(); 4364 } 4365 } 4366 4367 // Compute some basic properties of the types and the initializer. 4368 bool isRValRef = DeclType->isRValueReferenceType(); 4369 bool DerivedToBase = false; 4370 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 4371 Init->isLvalue(Context); 4372 ReferenceCompareResult RefRelationship 4373 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 4374 4375 // Most paths end in a failed conversion. 4376 if (ICS) 4377 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 4378 4379 // C++ [dcl.init.ref]p5: 4380 // A reference to type "cv1 T1" is initialized by an expression 4381 // of type "cv2 T2" as follows: 4382 4383 // -- If the initializer expression 4384 4385 // Rvalue references cannot bind to lvalues (N2812). 4386 // There is absolutely no situation where they can. In particular, note that 4387 // this is ill-formed, even if B has a user-defined conversion to A&&: 4388 // B b; 4389 // A&& r = b; 4390 if (isRValRef && InitLvalue == Expr::LV_Valid) { 4391 if (!ICS) 4392 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4393 << Init->getSourceRange(); 4394 return true; 4395 } 4396 4397 bool BindsDirectly = false; 4398 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 4399 // reference-compatible with "cv2 T2," or 4400 // 4401 // Note that the bit-field check is skipped if we are just computing 4402 // the implicit conversion sequence (C++ [over.best.ics]p2). 4403 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 4404 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4405 BindsDirectly = true; 4406 4407 if (ICS) { 4408 // C++ [over.ics.ref]p1: 4409 // When a parameter of reference type binds directly (8.5.3) 4410 // to an argument expression, the implicit conversion sequence 4411 // is the identity conversion, unless the argument expression 4412 // has a type that is a derived class of the parameter type, 4413 // in which case the implicit conversion sequence is a 4414 // derived-to-base Conversion (13.3.3.1). 4415 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 4416 ICS->Standard.First = ICK_Identity; 4417 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4418 ICS->Standard.Third = ICK_Identity; 4419 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4420 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 4421 ICS->Standard.ReferenceBinding = true; 4422 ICS->Standard.DirectBinding = true; 4423 ICS->Standard.RRefBinding = false; 4424 ICS->Standard.CopyConstructor = 0; 4425 4426 // Nothing more to do: the inaccessibility/ambiguity check for 4427 // derived-to-base conversions is suppressed when we're 4428 // computing the implicit conversion sequence (C++ 4429 // [over.best.ics]p2). 4430 return false; 4431 } else { 4432 // Perform the conversion. 4433 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4434 if (DerivedToBase) 4435 CK = CastExpr::CK_DerivedToBase; 4436 else if(CheckExceptionSpecCompatibility(Init, T1)) 4437 return true; 4438 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 4439 } 4440 } 4441 4442 // -- has a class type (i.e., T2 is a class type) and can be 4443 // implicitly converted to an lvalue of type "cv3 T3," 4444 // where "cv1 T1" is reference-compatible with "cv3 T3" 4445 // 92) (this conversion is selected by enumerating the 4446 // applicable conversion functions (13.3.1.6) and choosing 4447 // the best one through overload resolution (13.3)), 4448 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 4449 !RequireCompleteType(DeclLoc, T2, 0)) { 4450 CXXRecordDecl *T2RecordDecl 4451 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 4452 4453 OverloadCandidateSet CandidateSet; 4454 const UnresolvedSet *Conversions 4455 = T2RecordDecl->getVisibleConversionFunctions(); 4456 for (UnresolvedSet::iterator I = Conversions->begin(), 4457 E = Conversions->end(); I != E; ++I) { 4458 NamedDecl *D = *I; 4459 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); 4460 if (isa<UsingShadowDecl>(D)) 4461 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 4462 4463 FunctionTemplateDecl *ConvTemplate 4464 = dyn_cast<FunctionTemplateDecl>(D); 4465 CXXConversionDecl *Conv; 4466 if (ConvTemplate) 4467 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 4468 else 4469 Conv = cast<CXXConversionDecl>(D); 4470 4471 // If the conversion function doesn't return a reference type, 4472 // it can't be considered for this conversion. 4473 if (Conv->getConversionType()->isLValueReferenceType() && 4474 (AllowExplicit || !Conv->isExplicit())) { 4475 if (ConvTemplate) 4476 AddTemplateConversionCandidate(ConvTemplate, ActingDC, 4477 Init, DeclType, CandidateSet); 4478 else 4479 AddConversionCandidate(Conv, ActingDC, Init, DeclType, CandidateSet); 4480 } 4481 } 4482 4483 OverloadCandidateSet::iterator Best; 4484 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 4485 case OR_Success: 4486 // This is a direct binding. 4487 BindsDirectly = true; 4488 4489 if (ICS) { 4490 // C++ [over.ics.ref]p1: 4491 // 4492 // [...] If the parameter binds directly to the result of 4493 // applying a conversion function to the argument 4494 // expression, the implicit conversion sequence is a 4495 // user-defined conversion sequence (13.3.3.1.2), with the 4496 // second standard conversion sequence either an identity 4497 // conversion or, if the conversion function returns an 4498 // entity of a type that is a derived class of the parameter 4499 // type, a derived-to-base Conversion. 4500 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 4501 ICS->UserDefined.Before = Best->Conversions[0].Standard; 4502 ICS->UserDefined.After = Best->FinalConversion; 4503 ICS->UserDefined.ConversionFunction = Best->Function; 4504 ICS->UserDefined.EllipsisConversion = false; 4505 assert(ICS->UserDefined.After.ReferenceBinding && 4506 ICS->UserDefined.After.DirectBinding && 4507 "Expected a direct reference binding!"); 4508 return false; 4509 } else { 4510 OwningExprResult InitConversion = 4511 BuildCXXCastArgument(DeclLoc, QualType(), 4512 CastExpr::CK_UserDefinedConversion, 4513 cast<CXXMethodDecl>(Best->Function), 4514 Owned(Init)); 4515 Init = InitConversion.takeAs<Expr>(); 4516 4517 if (CheckExceptionSpecCompatibility(Init, T1)) 4518 return true; 4519 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 4520 /*isLvalue=*/true); 4521 } 4522 break; 4523 4524 case OR_Ambiguous: 4525 if (ICS) { 4526 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 4527 Cand != CandidateSet.end(); ++Cand) 4528 if (Cand->Viable) 4529 ICS->ConversionFunctionSet.push_back(Cand->Function); 4530 break; 4531 } 4532 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 4533 << Init->getSourceRange(); 4534 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 4535 return true; 4536 4537 case OR_No_Viable_Function: 4538 case OR_Deleted: 4539 // There was no suitable conversion, or we found a deleted 4540 // conversion; continue with other checks. 4541 break; 4542 } 4543 } 4544 4545 if (BindsDirectly) { 4546 // C++ [dcl.init.ref]p4: 4547 // [...] In all cases where the reference-related or 4548 // reference-compatible relationship of two types is used to 4549 // establish the validity of a reference binding, and T1 is a 4550 // base class of T2, a program that necessitates such a binding 4551 // is ill-formed if T1 is an inaccessible (clause 11) or 4552 // ambiguous (10.2) base class of T2. 4553 // 4554 // Note that we only check this condition when we're allowed to 4555 // complain about errors, because we should not be checking for 4556 // ambiguity (or inaccessibility) unless the reference binding 4557 // actually happens. 4558 if (DerivedToBase) 4559 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 4560 Init->getSourceRange(), 4561 IgnoreBaseAccess); 4562 else 4563 return false; 4564 } 4565 4566 // -- Otherwise, the reference shall be to a non-volatile const 4567 // type (i.e., cv1 shall be const), or the reference shall be an 4568 // rvalue reference and the initializer expression shall be an rvalue. 4569 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4570 if (!ICS) 4571 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4572 << T1 << int(InitLvalue != Expr::LV_Valid) 4573 << T2 << Init->getSourceRange(); 4574 return true; 4575 } 4576 4577 // -- If the initializer expression is an rvalue, with T2 a 4578 // class type, and "cv1 T1" is reference-compatible with 4579 // "cv2 T2," the reference is bound in one of the 4580 // following ways (the choice is implementation-defined): 4581 // 4582 // -- The reference is bound to the object represented by 4583 // the rvalue (see 3.10) or to a sub-object within that 4584 // object. 4585 // 4586 // -- A temporary of type "cv1 T2" [sic] is created, and 4587 // a constructor is called to copy the entire rvalue 4588 // object into the temporary. The reference is bound to 4589 // the temporary or to a sub-object within the 4590 // temporary. 4591 // 4592 // The constructor that would be used to make the copy 4593 // shall be callable whether or not the copy is actually 4594 // done. 4595 // 4596 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4597 // freedom, so we will always take the first option and never build 4598 // a temporary in this case. FIXME: We will, however, have to check 4599 // for the presence of a copy constructor in C++98/03 mode. 4600 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4601 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4602 if (ICS) { 4603 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 4604 ICS->Standard.First = ICK_Identity; 4605 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4606 ICS->Standard.Third = ICK_Identity; 4607 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4608 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 4609 ICS->Standard.ReferenceBinding = true; 4610 ICS->Standard.DirectBinding = false; 4611 ICS->Standard.RRefBinding = isRValRef; 4612 ICS->Standard.CopyConstructor = 0; 4613 } else { 4614 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4615 if (DerivedToBase) 4616 CK = CastExpr::CK_DerivedToBase; 4617 else if(CheckExceptionSpecCompatibility(Init, T1)) 4618 return true; 4619 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4620 } 4621 return false; 4622 } 4623 4624 // -- Otherwise, a temporary of type "cv1 T1" is created and 4625 // initialized from the initializer expression using the 4626 // rules for a non-reference copy initialization (8.5). The 4627 // reference is then bound to the temporary. If T1 is 4628 // reference-related to T2, cv1 must be the same 4629 // cv-qualification as, or greater cv-qualification than, 4630 // cv2; otherwise, the program is ill-formed. 4631 if (RefRelationship == Ref_Related) { 4632 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4633 // we would be reference-compatible or reference-compatible with 4634 // added qualification. But that wasn't the case, so the reference 4635 // initialization fails. 4636 if (!ICS) 4637 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4638 << T1 << int(InitLvalue != Expr::LV_Valid) 4639 << T2 << Init->getSourceRange(); 4640 return true; 4641 } 4642 4643 // If at least one of the types is a class type, the types are not 4644 // related, and we aren't allowed any user conversions, the 4645 // reference binding fails. This case is important for breaking 4646 // recursion, since TryImplicitConversion below will attempt to 4647 // create a temporary through the use of a copy constructor. 4648 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4649 (T1->isRecordType() || T2->isRecordType())) { 4650 if (!ICS) 4651 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4652 << DeclType << Init->getType() << AA_Initializing << Init->getSourceRange(); 4653 return true; 4654 } 4655 4656 // Actually try to convert the initializer to T1. 4657 if (ICS) { 4658 // C++ [over.ics.ref]p2: 4659 // 4660 // When a parameter of reference type is not bound directly to 4661 // an argument expression, the conversion sequence is the one 4662 // required to convert the argument expression to the 4663 // underlying type of the reference according to 4664 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4665 // to copy-initializing a temporary of the underlying type with 4666 // the argument expression. Any difference in top-level 4667 // cv-qualification is subsumed by the initialization itself 4668 // and does not constitute a conversion. 4669 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4670 /*AllowExplicit=*/false, 4671 /*ForceRValue=*/false, 4672 /*InOverloadResolution=*/false); 4673 4674 // Of course, that's still a reference binding. 4675 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 4676 ICS->Standard.ReferenceBinding = true; 4677 ICS->Standard.RRefBinding = isRValRef; 4678 } else if (ICS->ConversionKind == 4679 ImplicitConversionSequence::UserDefinedConversion) { 4680 ICS->UserDefined.After.ReferenceBinding = true; 4681 ICS->UserDefined.After.RRefBinding = isRValRef; 4682 } 4683 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 4684 } else { 4685 ImplicitConversionSequence Conversions; 4686 bool badConversion = PerformImplicitConversion(Init, T1, AA_Initializing, 4687 false, false, 4688 Conversions); 4689 if (badConversion) { 4690 if ((Conversions.ConversionKind == 4691 ImplicitConversionSequence::BadConversion) 4692 && !Conversions.ConversionFunctionSet.empty()) { 4693 Diag(DeclLoc, 4694 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4695 for (int j = Conversions.ConversionFunctionSet.size()-1; 4696 j >= 0; j--) { 4697 FunctionDecl *Func = Conversions.ConversionFunctionSet[j]; 4698 Diag(Func->getLocation(), diag::err_ovl_candidate); 4699 } 4700 } 4701 else { 4702 if (isRValRef) 4703 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4704 << Init->getSourceRange(); 4705 else 4706 Diag(DeclLoc, diag::err_invalid_initialization) 4707 << DeclType << Init->getType() << Init->getSourceRange(); 4708 } 4709 } 4710 return badConversion; 4711 } 4712} 4713 4714static inline bool 4715CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4716 const FunctionDecl *FnDecl) { 4717 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4718 if (isa<NamespaceDecl>(DC)) { 4719 return SemaRef.Diag(FnDecl->getLocation(), 4720 diag::err_operator_new_delete_declared_in_namespace) 4721 << FnDecl->getDeclName(); 4722 } 4723 4724 if (isa<TranslationUnitDecl>(DC) && 4725 FnDecl->getStorageClass() == FunctionDecl::Static) { 4726 return SemaRef.Diag(FnDecl->getLocation(), 4727 diag::err_operator_new_delete_declared_static) 4728 << FnDecl->getDeclName(); 4729 } 4730 4731 return false; 4732} 4733 4734static inline bool 4735CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4736 CanQualType ExpectedResultType, 4737 CanQualType ExpectedFirstParamType, 4738 unsigned DependentParamTypeDiag, 4739 unsigned InvalidParamTypeDiag) { 4740 QualType ResultType = 4741 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4742 4743 // Check that the result type is not dependent. 4744 if (ResultType->isDependentType()) 4745 return SemaRef.Diag(FnDecl->getLocation(), 4746 diag::err_operator_new_delete_dependent_result_type) 4747 << FnDecl->getDeclName() << ExpectedResultType; 4748 4749 // Check that the result type is what we expect. 4750 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4751 return SemaRef.Diag(FnDecl->getLocation(), 4752 diag::err_operator_new_delete_invalid_result_type) 4753 << FnDecl->getDeclName() << ExpectedResultType; 4754 4755 // A function template must have at least 2 parameters. 4756 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4757 return SemaRef.Diag(FnDecl->getLocation(), 4758 diag::err_operator_new_delete_template_too_few_parameters) 4759 << FnDecl->getDeclName(); 4760 4761 // The function decl must have at least 1 parameter. 4762 if (FnDecl->getNumParams() == 0) 4763 return SemaRef.Diag(FnDecl->getLocation(), 4764 diag::err_operator_new_delete_too_few_parameters) 4765 << FnDecl->getDeclName(); 4766 4767 // Check the the first parameter type is not dependent. 4768 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4769 if (FirstParamType->isDependentType()) 4770 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4771 << FnDecl->getDeclName() << ExpectedFirstParamType; 4772 4773 // Check that the first parameter type is what we expect. 4774 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4775 ExpectedFirstParamType) 4776 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4777 << FnDecl->getDeclName() << ExpectedFirstParamType; 4778 4779 return false; 4780} 4781 4782static bool 4783CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4784 // C++ [basic.stc.dynamic.allocation]p1: 4785 // A program is ill-formed if an allocation function is declared in a 4786 // namespace scope other than global scope or declared static in global 4787 // scope. 4788 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4789 return true; 4790 4791 CanQualType SizeTy = 4792 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4793 4794 // C++ [basic.stc.dynamic.allocation]p1: 4795 // The return type shall be void*. The first parameter shall have type 4796 // std::size_t. 4797 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4798 SizeTy, 4799 diag::err_operator_new_dependent_param_type, 4800 diag::err_operator_new_param_type)) 4801 return true; 4802 4803 // C++ [basic.stc.dynamic.allocation]p1: 4804 // The first parameter shall not have an associated default argument. 4805 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4806 return SemaRef.Diag(FnDecl->getLocation(), 4807 diag::err_operator_new_default_arg) 4808 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4809 4810 return false; 4811} 4812 4813static bool 4814CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4815 // C++ [basic.stc.dynamic.deallocation]p1: 4816 // A program is ill-formed if deallocation functions are declared in a 4817 // namespace scope other than global scope or declared static in global 4818 // scope. 4819 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4820 return true; 4821 4822 // C++ [basic.stc.dynamic.deallocation]p2: 4823 // Each deallocation function shall return void and its first parameter 4824 // shall be void*. 4825 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4826 SemaRef.Context.VoidPtrTy, 4827 diag::err_operator_delete_dependent_param_type, 4828 diag::err_operator_delete_param_type)) 4829 return true; 4830 4831 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4832 if (FirstParamType->isDependentType()) 4833 return SemaRef.Diag(FnDecl->getLocation(), 4834 diag::err_operator_delete_dependent_param_type) 4835 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4836 4837 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4838 SemaRef.Context.VoidPtrTy) 4839 return SemaRef.Diag(FnDecl->getLocation(), 4840 diag::err_operator_delete_param_type) 4841 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4842 4843 return false; 4844} 4845 4846/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4847/// of this overloaded operator is well-formed. If so, returns false; 4848/// otherwise, emits appropriate diagnostics and returns true. 4849bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4850 assert(FnDecl && FnDecl->isOverloadedOperator() && 4851 "Expected an overloaded operator declaration"); 4852 4853 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4854 4855 // C++ [over.oper]p5: 4856 // The allocation and deallocation functions, operator new, 4857 // operator new[], operator delete and operator delete[], are 4858 // described completely in 3.7.3. The attributes and restrictions 4859 // found in the rest of this subclause do not apply to them unless 4860 // explicitly stated in 3.7.3. 4861 if (Op == OO_Delete || Op == OO_Array_Delete) 4862 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4863 4864 if (Op == OO_New || Op == OO_Array_New) 4865 return CheckOperatorNewDeclaration(*this, FnDecl); 4866 4867 // C++ [over.oper]p6: 4868 // An operator function shall either be a non-static member 4869 // function or be a non-member function and have at least one 4870 // parameter whose type is a class, a reference to a class, an 4871 // enumeration, or a reference to an enumeration. 4872 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4873 if (MethodDecl->isStatic()) 4874 return Diag(FnDecl->getLocation(), 4875 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4876 } else { 4877 bool ClassOrEnumParam = false; 4878 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4879 ParamEnd = FnDecl->param_end(); 4880 Param != ParamEnd; ++Param) { 4881 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4882 if (ParamType->isDependentType() || ParamType->isRecordType() || 4883 ParamType->isEnumeralType()) { 4884 ClassOrEnumParam = true; 4885 break; 4886 } 4887 } 4888 4889 if (!ClassOrEnumParam) 4890 return Diag(FnDecl->getLocation(), 4891 diag::err_operator_overload_needs_class_or_enum) 4892 << FnDecl->getDeclName(); 4893 } 4894 4895 // C++ [over.oper]p8: 4896 // An operator function cannot have default arguments (8.3.6), 4897 // except where explicitly stated below. 4898 // 4899 // Only the function-call operator allows default arguments 4900 // (C++ [over.call]p1). 4901 if (Op != OO_Call) { 4902 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4903 Param != FnDecl->param_end(); ++Param) { 4904 if ((*Param)->hasDefaultArg()) 4905 return Diag((*Param)->getLocation(), 4906 diag::err_operator_overload_default_arg) 4907 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4908 } 4909 } 4910 4911 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4912 { false, false, false } 4913#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4914 , { Unary, Binary, MemberOnly } 4915#include "clang/Basic/OperatorKinds.def" 4916 }; 4917 4918 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4919 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4920 bool MustBeMemberOperator = OperatorUses[Op][2]; 4921 4922 // C++ [over.oper]p8: 4923 // [...] Operator functions cannot have more or fewer parameters 4924 // than the number required for the corresponding operator, as 4925 // described in the rest of this subclause. 4926 unsigned NumParams = FnDecl->getNumParams() 4927 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4928 if (Op != OO_Call && 4929 ((NumParams == 1 && !CanBeUnaryOperator) || 4930 (NumParams == 2 && !CanBeBinaryOperator) || 4931 (NumParams < 1) || (NumParams > 2))) { 4932 // We have the wrong number of parameters. 4933 unsigned ErrorKind; 4934 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4935 ErrorKind = 2; // 2 -> unary or binary. 4936 } else if (CanBeUnaryOperator) { 4937 ErrorKind = 0; // 0 -> unary 4938 } else { 4939 assert(CanBeBinaryOperator && 4940 "All non-call overloaded operators are unary or binary!"); 4941 ErrorKind = 1; // 1 -> binary 4942 } 4943 4944 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4945 << FnDecl->getDeclName() << NumParams << ErrorKind; 4946 } 4947 4948 // Overloaded operators other than operator() cannot be variadic. 4949 if (Op != OO_Call && 4950 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4951 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4952 << FnDecl->getDeclName(); 4953 } 4954 4955 // Some operators must be non-static member functions. 4956 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4957 return Diag(FnDecl->getLocation(), 4958 diag::err_operator_overload_must_be_member) 4959 << FnDecl->getDeclName(); 4960 } 4961 4962 // C++ [over.inc]p1: 4963 // The user-defined function called operator++ implements the 4964 // prefix and postfix ++ operator. If this function is a member 4965 // function with no parameters, or a non-member function with one 4966 // parameter of class or enumeration type, it defines the prefix 4967 // increment operator ++ for objects of that type. If the function 4968 // is a member function with one parameter (which shall be of type 4969 // int) or a non-member function with two parameters (the second 4970 // of which shall be of type int), it defines the postfix 4971 // increment operator ++ for objects of that type. 4972 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4973 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4974 bool ParamIsInt = false; 4975 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4976 ParamIsInt = BT->getKind() == BuiltinType::Int; 4977 4978 if (!ParamIsInt) 4979 return Diag(LastParam->getLocation(), 4980 diag::err_operator_overload_post_incdec_must_be_int) 4981 << LastParam->getType() << (Op == OO_MinusMinus); 4982 } 4983 4984 // Notify the class if it got an assignment operator. 4985 if (Op == OO_Equal) { 4986 // Would have returned earlier otherwise. 4987 assert(isa<CXXMethodDecl>(FnDecl) && 4988 "Overloaded = not member, but not filtered."); 4989 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 4990 Method->getParent()->addedAssignmentOperator(Context, Method); 4991 } 4992 4993 return false; 4994} 4995 4996/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 4997/// linkage specification, including the language and (if present) 4998/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 4999/// the location of the language string literal, which is provided 5000/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5001/// the '{' brace. Otherwise, this linkage specification does not 5002/// have any braces. 5003Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5004 SourceLocation ExternLoc, 5005 SourceLocation LangLoc, 5006 const char *Lang, 5007 unsigned StrSize, 5008 SourceLocation LBraceLoc) { 5009 LinkageSpecDecl::LanguageIDs Language; 5010 if (strncmp(Lang, "\"C\"", StrSize) == 0) 5011 Language = LinkageSpecDecl::lang_c; 5012 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 5013 Language = LinkageSpecDecl::lang_cxx; 5014 else { 5015 Diag(LangLoc, diag::err_bad_language); 5016 return DeclPtrTy(); 5017 } 5018 5019 // FIXME: Add all the various semantics of linkage specifications 5020 5021 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5022 LangLoc, Language, 5023 LBraceLoc.isValid()); 5024 CurContext->addDecl(D); 5025 PushDeclContext(S, D); 5026 return DeclPtrTy::make(D); 5027} 5028 5029/// ActOnFinishLinkageSpecification - Completely the definition of 5030/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5031/// valid, it's the position of the closing '}' brace in a linkage 5032/// specification that uses braces. 5033Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5034 DeclPtrTy LinkageSpec, 5035 SourceLocation RBraceLoc) { 5036 if (LinkageSpec) 5037 PopDeclContext(); 5038 return LinkageSpec; 5039} 5040 5041/// \brief Perform semantic analysis for the variable declaration that 5042/// occurs within a C++ catch clause, returning the newly-created 5043/// variable. 5044VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5045 TypeSourceInfo *TInfo, 5046 IdentifierInfo *Name, 5047 SourceLocation Loc, 5048 SourceRange Range) { 5049 bool Invalid = false; 5050 5051 // Arrays and functions decay. 5052 if (ExDeclType->isArrayType()) 5053 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5054 else if (ExDeclType->isFunctionType()) 5055 ExDeclType = Context.getPointerType(ExDeclType); 5056 5057 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5058 // The exception-declaration shall not denote a pointer or reference to an 5059 // incomplete type, other than [cv] void*. 5060 // N2844 forbids rvalue references. 5061 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5062 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5063 Invalid = true; 5064 } 5065 5066 QualType BaseType = ExDeclType; 5067 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5068 unsigned DK = diag::err_catch_incomplete; 5069 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5070 BaseType = Ptr->getPointeeType(); 5071 Mode = 1; 5072 DK = diag::err_catch_incomplete_ptr; 5073 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5074 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5075 BaseType = Ref->getPointeeType(); 5076 Mode = 2; 5077 DK = diag::err_catch_incomplete_ref; 5078 } 5079 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5080 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 5081 Invalid = true; 5082 5083 if (!Invalid && !ExDeclType->isDependentType() && 5084 RequireNonAbstractType(Loc, ExDeclType, 5085 diag::err_abstract_type_in_decl, 5086 AbstractVariableType)) 5087 Invalid = true; 5088 5089 // FIXME: Need to test for ability to copy-construct and destroy the 5090 // exception variable. 5091 5092 // FIXME: Need to check for abstract classes. 5093 5094 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5095 Name, ExDeclType, TInfo, VarDecl::None); 5096 5097 if (Invalid) 5098 ExDecl->setInvalidDecl(); 5099 5100 return ExDecl; 5101} 5102 5103/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5104/// handler. 5105Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5106 TypeSourceInfo *TInfo = 0; 5107 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5108 5109 bool Invalid = D.isInvalidType(); 5110 IdentifierInfo *II = D.getIdentifier(); 5111 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 5112 // The scope should be freshly made just for us. There is just no way 5113 // it contains any previous declaration. 5114 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5115 if (PrevDecl->isTemplateParameter()) { 5116 // Maybe we will complain about the shadowed template parameter. 5117 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5118 } 5119 } 5120 5121 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5122 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5123 << D.getCXXScopeSpec().getRange(); 5124 Invalid = true; 5125 } 5126 5127 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5128 D.getIdentifier(), 5129 D.getIdentifierLoc(), 5130 D.getDeclSpec().getSourceRange()); 5131 5132 if (Invalid) 5133 ExDecl->setInvalidDecl(); 5134 5135 // Add the exception declaration into this scope. 5136 if (II) 5137 PushOnScopeChains(ExDecl, S); 5138 else 5139 CurContext->addDecl(ExDecl); 5140 5141 ProcessDeclAttributes(S, ExDecl, D); 5142 return DeclPtrTy::make(ExDecl); 5143} 5144 5145Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5146 ExprArg assertexpr, 5147 ExprArg assertmessageexpr) { 5148 Expr *AssertExpr = (Expr *)assertexpr.get(); 5149 StringLiteral *AssertMessage = 5150 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5151 5152 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5153 llvm::APSInt Value(32); 5154 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5155 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5156 AssertExpr->getSourceRange(); 5157 return DeclPtrTy(); 5158 } 5159 5160 if (Value == 0) { 5161 Diag(AssertLoc, diag::err_static_assert_failed) 5162 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5163 } 5164 } 5165 5166 assertexpr.release(); 5167 assertmessageexpr.release(); 5168 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5169 AssertExpr, AssertMessage); 5170 5171 CurContext->addDecl(Decl); 5172 return DeclPtrTy::make(Decl); 5173} 5174 5175/// Handle a friend type declaration. This works in tandem with 5176/// ActOnTag. 5177/// 5178/// Notes on friend class templates: 5179/// 5180/// We generally treat friend class declarations as if they were 5181/// declaring a class. So, for example, the elaborated type specifier 5182/// in a friend declaration is required to obey the restrictions of a 5183/// class-head (i.e. no typedefs in the scope chain), template 5184/// parameters are required to match up with simple template-ids, &c. 5185/// However, unlike when declaring a template specialization, it's 5186/// okay to refer to a template specialization without an empty 5187/// template parameter declaration, e.g. 5188/// friend class A<T>::B<unsigned>; 5189/// We permit this as a special case; if there are any template 5190/// parameters present at all, require proper matching, i.e. 5191/// template <> template <class T> friend class A<int>::B; 5192Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5193 MultiTemplateParamsArg TempParams) { 5194 SourceLocation Loc = DS.getSourceRange().getBegin(); 5195 5196 assert(DS.isFriendSpecified()); 5197 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5198 5199 // Try to convert the decl specifier to a type. This works for 5200 // friend templates because ActOnTag never produces a ClassTemplateDecl 5201 // for a TUK_Friend. 5202 Declarator TheDeclarator(DS, Declarator::MemberContext); 5203 QualType T = GetTypeForDeclarator(TheDeclarator, S); 5204 if (TheDeclarator.isInvalidType()) 5205 return DeclPtrTy(); 5206 5207 // This is definitely an error in C++98. It's probably meant to 5208 // be forbidden in C++0x, too, but the specification is just 5209 // poorly written. 5210 // 5211 // The problem is with declarations like the following: 5212 // template <T> friend A<T>::foo; 5213 // where deciding whether a class C is a friend or not now hinges 5214 // on whether there exists an instantiation of A that causes 5215 // 'foo' to equal C. There are restrictions on class-heads 5216 // (which we declare (by fiat) elaborated friend declarations to 5217 // be) that makes this tractable. 5218 // 5219 // FIXME: handle "template <> friend class A<T>;", which 5220 // is possibly well-formed? Who even knows? 5221 if (TempParams.size() && !isa<ElaboratedType>(T)) { 5222 Diag(Loc, diag::err_tagless_friend_type_template) 5223 << DS.getSourceRange(); 5224 return DeclPtrTy(); 5225 } 5226 5227 // C++ [class.friend]p2: 5228 // An elaborated-type-specifier shall be used in a friend declaration 5229 // for a class.* 5230 // * The class-key of the elaborated-type-specifier is required. 5231 // This is one of the rare places in Clang where it's legitimate to 5232 // ask about the "spelling" of the type. 5233 if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) { 5234 // If we evaluated the type to a record type, suggest putting 5235 // a tag in front. 5236 if (const RecordType *RT = T->getAs<RecordType>()) { 5237 RecordDecl *RD = RT->getDecl(); 5238 5239 std::string InsertionText = std::string(" ") + RD->getKindName(); 5240 5241 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 5242 << (unsigned) RD->getTagKind() 5243 << T 5244 << SourceRange(DS.getFriendSpecLoc()) 5245 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 5246 InsertionText); 5247 return DeclPtrTy(); 5248 }else { 5249 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 5250 << DS.getSourceRange(); 5251 return DeclPtrTy(); 5252 } 5253 } 5254 5255 // Enum types cannot be friends. 5256 if (T->getAs<EnumType>()) { 5257 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 5258 << SourceRange(DS.getFriendSpecLoc()); 5259 return DeclPtrTy(); 5260 } 5261 5262 // C++98 [class.friend]p1: A friend of a class is a function 5263 // or class that is not a member of the class . . . 5264 // This is fixed in DR77, which just barely didn't make the C++03 5265 // deadline. It's also a very silly restriction that seriously 5266 // affects inner classes and which nobody else seems to implement; 5267 // thus we never diagnose it, not even in -pedantic. 5268 5269 Decl *D; 5270 if (TempParams.size()) 5271 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5272 TempParams.size(), 5273 (TemplateParameterList**) TempParams.release(), 5274 T.getTypePtr(), 5275 DS.getFriendSpecLoc()); 5276 else 5277 D = FriendDecl::Create(Context, CurContext, Loc, T.getTypePtr(), 5278 DS.getFriendSpecLoc()); 5279 D->setAccess(AS_public); 5280 CurContext->addDecl(D); 5281 5282 return DeclPtrTy::make(D); 5283} 5284 5285Sema::DeclPtrTy 5286Sema::ActOnFriendFunctionDecl(Scope *S, 5287 Declarator &D, 5288 bool IsDefinition, 5289 MultiTemplateParamsArg TemplateParams) { 5290 const DeclSpec &DS = D.getDeclSpec(); 5291 5292 assert(DS.isFriendSpecified()); 5293 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5294 5295 SourceLocation Loc = D.getIdentifierLoc(); 5296 TypeSourceInfo *TInfo = 0; 5297 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5298 5299 // C++ [class.friend]p1 5300 // A friend of a class is a function or class.... 5301 // Note that this sees through typedefs, which is intended. 5302 // It *doesn't* see through dependent types, which is correct 5303 // according to [temp.arg.type]p3: 5304 // If a declaration acquires a function type through a 5305 // type dependent on a template-parameter and this causes 5306 // a declaration that does not use the syntactic form of a 5307 // function declarator to have a function type, the program 5308 // is ill-formed. 5309 if (!T->isFunctionType()) { 5310 Diag(Loc, diag::err_unexpected_friend); 5311 5312 // It might be worthwhile to try to recover by creating an 5313 // appropriate declaration. 5314 return DeclPtrTy(); 5315 } 5316 5317 // C++ [namespace.memdef]p3 5318 // - If a friend declaration in a non-local class first declares a 5319 // class or function, the friend class or function is a member 5320 // of the innermost enclosing namespace. 5321 // - The name of the friend is not found by simple name lookup 5322 // until a matching declaration is provided in that namespace 5323 // scope (either before or after the class declaration granting 5324 // friendship). 5325 // - If a friend function is called, its name may be found by the 5326 // name lookup that considers functions from namespaces and 5327 // classes associated with the types of the function arguments. 5328 // - When looking for a prior declaration of a class or a function 5329 // declared as a friend, scopes outside the innermost enclosing 5330 // namespace scope are not considered. 5331 5332 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5333 DeclarationName Name = GetNameForDeclarator(D); 5334 assert(Name); 5335 5336 // The context we found the declaration in, or in which we should 5337 // create the declaration. 5338 DeclContext *DC; 5339 5340 // FIXME: handle local classes 5341 5342 // Recover from invalid scope qualifiers as if they just weren't there. 5343 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5344 ForRedeclaration); 5345 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5346 // FIXME: RequireCompleteDeclContext 5347 DC = computeDeclContext(ScopeQual); 5348 5349 // FIXME: handle dependent contexts 5350 if (!DC) return DeclPtrTy(); 5351 5352 LookupQualifiedName(Previous, DC); 5353 5354 // If searching in that context implicitly found a declaration in 5355 // a different context, treat it like it wasn't found at all. 5356 // TODO: better diagnostics for this case. Suggesting the right 5357 // qualified scope would be nice... 5358 // FIXME: getRepresentativeDecl() is not right here at all 5359 if (Previous.empty() || 5360 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5361 D.setInvalidType(); 5362 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5363 return DeclPtrTy(); 5364 } 5365 5366 // C++ [class.friend]p1: A friend of a class is a function or 5367 // class that is not a member of the class . . . 5368 if (DC->Equals(CurContext)) 5369 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5370 5371 // Otherwise walk out to the nearest namespace scope looking for matches. 5372 } else { 5373 // TODO: handle local class contexts. 5374 5375 DC = CurContext; 5376 while (true) { 5377 // Skip class contexts. If someone can cite chapter and verse 5378 // for this behavior, that would be nice --- it's what GCC and 5379 // EDG do, and it seems like a reasonable intent, but the spec 5380 // really only says that checks for unqualified existing 5381 // declarations should stop at the nearest enclosing namespace, 5382 // not that they should only consider the nearest enclosing 5383 // namespace. 5384 while (DC->isRecord()) 5385 DC = DC->getParent(); 5386 5387 LookupQualifiedName(Previous, DC); 5388 5389 // TODO: decide what we think about using declarations. 5390 if (!Previous.empty()) 5391 break; 5392 5393 if (DC->isFileContext()) break; 5394 DC = DC->getParent(); 5395 } 5396 5397 // C++ [class.friend]p1: A friend of a class is a function or 5398 // class that is not a member of the class . . . 5399 // C++0x changes this for both friend types and functions. 5400 // Most C++ 98 compilers do seem to give an error here, so 5401 // we do, too. 5402 if (!Previous.empty() && DC->Equals(CurContext) 5403 && !getLangOptions().CPlusPlus0x) 5404 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5405 } 5406 5407 if (DC->isFileContext()) { 5408 // This implies that it has to be an operator or function. 5409 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5410 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5411 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5412 Diag(Loc, diag::err_introducing_special_friend) << 5413 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5414 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5415 return DeclPtrTy(); 5416 } 5417 } 5418 5419 bool Redeclaration = false; 5420 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5421 move(TemplateParams), 5422 IsDefinition, 5423 Redeclaration); 5424 if (!ND) return DeclPtrTy(); 5425 5426 assert(ND->getDeclContext() == DC); 5427 assert(ND->getLexicalDeclContext() == CurContext); 5428 5429 // Add the function declaration to the appropriate lookup tables, 5430 // adjusting the redeclarations list as necessary. We don't 5431 // want to do this yet if the friending class is dependent. 5432 // 5433 // Also update the scope-based lookup if the target context's 5434 // lookup context is in lexical scope. 5435 if (!CurContext->isDependentContext()) { 5436 DC = DC->getLookupContext(); 5437 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5438 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5439 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5440 } 5441 5442 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5443 D.getIdentifierLoc(), ND, 5444 DS.getFriendSpecLoc()); 5445 FrD->setAccess(AS_public); 5446 CurContext->addDecl(FrD); 5447 5448 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) 5449 FrD->setSpecialization(true); 5450 5451 return DeclPtrTy::make(ND); 5452} 5453 5454void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5455 AdjustDeclIfTemplate(dcl); 5456 5457 Decl *Dcl = dcl.getAs<Decl>(); 5458 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5459 if (!Fn) { 5460 Diag(DelLoc, diag::err_deleted_non_function); 5461 return; 5462 } 5463 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5464 Diag(DelLoc, diag::err_deleted_decl_not_first); 5465 Diag(Prev->getLocation(), diag::note_previous_declaration); 5466 // If the declaration wasn't the first, we delete the function anyway for 5467 // recovery. 5468 } 5469 Fn->setDeleted(); 5470} 5471 5472static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5473 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5474 ++CI) { 5475 Stmt *SubStmt = *CI; 5476 if (!SubStmt) 5477 continue; 5478 if (isa<ReturnStmt>(SubStmt)) 5479 Self.Diag(SubStmt->getSourceRange().getBegin(), 5480 diag::err_return_in_constructor_handler); 5481 if (!isa<Expr>(SubStmt)) 5482 SearchForReturnInStmt(Self, SubStmt); 5483 } 5484} 5485 5486void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5487 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5488 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5489 SearchForReturnInStmt(*this, Handler); 5490 } 5491} 5492 5493bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5494 const CXXMethodDecl *Old) { 5495 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5496 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5497 5498 QualType CNewTy = Context.getCanonicalType(NewTy); 5499 QualType COldTy = Context.getCanonicalType(OldTy); 5500 5501 if (CNewTy == COldTy && 5502 CNewTy.getLocalCVRQualifiers() == COldTy.getLocalCVRQualifiers()) 5503 return false; 5504 5505 // Check if the return types are covariant 5506 QualType NewClassTy, OldClassTy; 5507 5508 /// Both types must be pointers or references to classes. 5509 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 5510 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 5511 NewClassTy = NewPT->getPointeeType(); 5512 OldClassTy = OldPT->getPointeeType(); 5513 } 5514 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 5515 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 5516 NewClassTy = NewRT->getPointeeType(); 5517 OldClassTy = OldRT->getPointeeType(); 5518 } 5519 } 5520 5521 // The return types aren't either both pointers or references to a class type. 5522 if (NewClassTy.isNull()) { 5523 Diag(New->getLocation(), 5524 diag::err_different_return_type_for_overriding_virtual_function) 5525 << New->getDeclName() << NewTy << OldTy; 5526 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5527 5528 return true; 5529 } 5530 5531 // C++ [class.virtual]p6: 5532 // If the return type of D::f differs from the return type of B::f, the 5533 // class type in the return type of D::f shall be complete at the point of 5534 // declaration of D::f or shall be the class type D. 5535 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5536 if (!RT->isBeingDefined() && 5537 RequireCompleteType(New->getLocation(), NewClassTy, 5538 PDiag(diag::err_covariant_return_incomplete) 5539 << New->getDeclName())) 5540 return true; 5541 } 5542 5543 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5544 // Check if the new class derives from the old class. 5545 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5546 Diag(New->getLocation(), 5547 diag::err_covariant_return_not_derived) 5548 << New->getDeclName() << NewTy << OldTy; 5549 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5550 return true; 5551 } 5552 5553 // Check if we the conversion from derived to base is valid. 5554 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5555 diag::err_covariant_return_inaccessible_base, 5556 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5557 // FIXME: Should this point to the return type? 5558 New->getLocation(), SourceRange(), New->getDeclName())) { 5559 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5560 return true; 5561 } 5562 } 5563 5564 // The qualifiers of the return types must be the same. 5565 if (CNewTy.getLocalCVRQualifiers() != COldTy.getLocalCVRQualifiers()) { 5566 Diag(New->getLocation(), 5567 diag::err_covariant_return_type_different_qualifications) 5568 << New->getDeclName() << NewTy << OldTy; 5569 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5570 return true; 5571 }; 5572 5573 5574 // The new class type must have the same or less qualifiers as the old type. 5575 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5576 Diag(New->getLocation(), 5577 diag::err_covariant_return_type_class_type_more_qualified) 5578 << New->getDeclName() << NewTy << OldTy; 5579 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5580 return true; 5581 }; 5582 5583 return false; 5584} 5585 5586bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5587 const CXXMethodDecl *Old) 5588{ 5589 if (Old->hasAttr<FinalAttr>()) { 5590 Diag(New->getLocation(), diag::err_final_function_overridden) 5591 << New->getDeclName(); 5592 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5593 return true; 5594 } 5595 5596 return false; 5597} 5598 5599/// \brief Mark the given method pure. 5600/// 5601/// \param Method the method to be marked pure. 5602/// 5603/// \param InitRange the source range that covers the "0" initializer. 5604bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5605 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5606 Method->setPure(); 5607 5608 // A class is abstract if at least one function is pure virtual. 5609 Method->getParent()->setAbstract(true); 5610 return false; 5611 } 5612 5613 if (!Method->isInvalidDecl()) 5614 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5615 << Method->getDeclName() << InitRange; 5616 return true; 5617} 5618 5619/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5620/// an initializer for the out-of-line declaration 'Dcl'. The scope 5621/// is a fresh scope pushed for just this purpose. 5622/// 5623/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5624/// static data member of class X, names should be looked up in the scope of 5625/// class X. 5626void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5627 // If there is no declaration, there was an error parsing it. 5628 Decl *D = Dcl.getAs<Decl>(); 5629 if (D == 0) return; 5630 5631 // We should only get called for declarations with scope specifiers, like: 5632 // int foo::bar; 5633 assert(D->isOutOfLine()); 5634 EnterDeclaratorContext(S, D->getDeclContext()); 5635} 5636 5637/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5638/// initializer for the out-of-line declaration 'Dcl'. 5639void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5640 // If there is no declaration, there was an error parsing it. 5641 Decl *D = Dcl.getAs<Decl>(); 5642 if (D == 0) return; 5643 5644 assert(D->isOutOfLine()); 5645 ExitDeclaratorContext(S); 5646} 5647 5648/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5649/// C++ if/switch/while/for statement. 5650/// e.g: "if (int x = f()) {...}" 5651Action::DeclResult 5652Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5653 // C++ 6.4p2: 5654 // The declarator shall not specify a function or an array. 5655 // The type-specifier-seq shall not contain typedef and shall not declare a 5656 // new class or enumeration. 5657 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5658 "Parser allowed 'typedef' as storage class of condition decl."); 5659 5660 TypeSourceInfo *TInfo = 0; 5661 TagDecl *OwnedTag = 0; 5662 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5663 5664 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5665 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5666 // would be created and CXXConditionDeclExpr wants a VarDecl. 5667 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5668 << D.getSourceRange(); 5669 return DeclResult(); 5670 } else if (OwnedTag && OwnedTag->isDefinition()) { 5671 // The type-specifier-seq shall not declare a new class or enumeration. 5672 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5673 } 5674 5675 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5676 if (!Dcl) 5677 return DeclResult(); 5678 5679 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5680 VD->setDeclaredInCondition(true); 5681 return Dcl; 5682} 5683 5684void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5685 CXXMethodDecl *MD) { 5686 // Ignore dependent types. 5687 if (MD->isDependentContext()) 5688 return; 5689 5690 CXXRecordDecl *RD = MD->getParent(); 5691 5692 // Ignore classes without a vtable. 5693 if (!RD->isDynamicClass()) 5694 return; 5695 5696 if (!MD->isOutOfLine()) { 5697 // The only inline functions we care about are constructors. We also defer 5698 // marking the virtual members as referenced until we've reached the end 5699 // of the translation unit. We do this because we need to know the key 5700 // function of the class in order to determine the key function. 5701 if (isa<CXXConstructorDecl>(MD)) 5702 ClassesWithUnmarkedVirtualMembers.insert(std::make_pair(RD, Loc)); 5703 return; 5704 } 5705 5706 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5707 5708 if (!KeyFunction) { 5709 // This record does not have a key function, so we assume that the vtable 5710 // will be emitted when it's used by the constructor. 5711 if (!isa<CXXConstructorDecl>(MD)) 5712 return; 5713 } else if (KeyFunction->getCanonicalDecl() != MD->getCanonicalDecl()) { 5714 // We don't have the right key function. 5715 return; 5716 } 5717 5718 // Mark the members as referenced. 5719 MarkVirtualMembersReferenced(Loc, RD); 5720 ClassesWithUnmarkedVirtualMembers.erase(RD); 5721} 5722 5723bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5724 if (ClassesWithUnmarkedVirtualMembers.empty()) 5725 return false; 5726 5727 for (std::map<CXXRecordDecl *, SourceLocation>::iterator i = 5728 ClassesWithUnmarkedVirtualMembers.begin(), 5729 e = ClassesWithUnmarkedVirtualMembers.end(); i != e; ++i) { 5730 CXXRecordDecl *RD = i->first; 5731 5732 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5733 if (KeyFunction) { 5734 // We know that the class has a key function. If the key function was 5735 // declared in this translation unit, then it the class decl would not 5736 // have been in the ClassesWithUnmarkedVirtualMembers map. 5737 continue; 5738 } 5739 5740 SourceLocation Loc = i->second; 5741 MarkVirtualMembersReferenced(Loc, RD); 5742 } 5743 5744 ClassesWithUnmarkedVirtualMembers.clear(); 5745 return true; 5746} 5747 5748void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, CXXRecordDecl *RD) { 5749 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5750 e = RD->method_end(); i != e; ++i) { 5751 CXXMethodDecl *MD = *i; 5752 5753 // C++ [basic.def.odr]p2: 5754 // [...] A virtual member function is used if it is not pure. [...] 5755 if (MD->isVirtual() && !MD->isPure()) 5756 MarkDeclarationReferenced(Loc, MD); 5757 } 5758} 5759 5760