SemaDeclCXX.cpp revision b0f65ca9853d1148211a38736141c8ccf2aa4a1d
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/RecordLayout.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/TypeLoc.h" 23#include "clang/AST/TypeOrdering.h" 24#include "clang/AST/StmtVisitor.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Parse/Template.h" 27#include "clang/Basic/PartialDiagnostic.h" 28#include "clang/Lex/Preprocessor.h" 29#include "llvm/ADT/STLExtras.h" 30#include <map> 31#include <set> 32 33using namespace clang; 34 35//===----------------------------------------------------------------------===// 36// CheckDefaultArgumentVisitor 37//===----------------------------------------------------------------------===// 38 39namespace { 40 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 41 /// the default argument of a parameter to determine whether it 42 /// contains any ill-formed subexpressions. For example, this will 43 /// diagnose the use of local variables or parameters within the 44 /// default argument expression. 45 class CheckDefaultArgumentVisitor 46 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 47 Expr *DefaultArg; 48 Sema *S; 49 50 public: 51 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 52 : DefaultArg(defarg), S(s) {} 53 54 bool VisitExpr(Expr *Node); 55 bool VisitDeclRefExpr(DeclRefExpr *DRE); 56 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 57 }; 58 59 /// VisitExpr - Visit all of the children of this expression. 60 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 61 bool IsInvalid = false; 62 for (Stmt::child_iterator I = Node->child_begin(), 63 E = Node->child_end(); I != E; ++I) 64 IsInvalid |= Visit(*I); 65 return IsInvalid; 66 } 67 68 /// VisitDeclRefExpr - Visit a reference to a declaration, to 69 /// determine whether this declaration can be used in the default 70 /// argument expression. 71 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 72 NamedDecl *Decl = DRE->getDecl(); 73 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 74 // C++ [dcl.fct.default]p9 75 // Default arguments are evaluated each time the function is 76 // called. The order of evaluation of function arguments is 77 // unspecified. Consequently, parameters of a function shall not 78 // be used in default argument expressions, even if they are not 79 // evaluated. Parameters of a function declared before a default 80 // argument expression are in scope and can hide namespace and 81 // class member names. 82 return S->Diag(DRE->getSourceRange().getBegin(), 83 diag::err_param_default_argument_references_param) 84 << Param->getDeclName() << DefaultArg->getSourceRange(); 85 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 86 // C++ [dcl.fct.default]p7 87 // Local variables shall not be used in default argument 88 // expressions. 89 if (VDecl->isBlockVarDecl()) 90 return S->Diag(DRE->getSourceRange().getBegin(), 91 diag::err_param_default_argument_references_local) 92 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 93 } 94 95 return false; 96 } 97 98 /// VisitCXXThisExpr - Visit a C++ "this" expression. 99 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 100 // C++ [dcl.fct.default]p8: 101 // The keyword this shall not be used in a default argument of a 102 // member function. 103 return S->Diag(ThisE->getSourceRange().getBegin(), 104 diag::err_param_default_argument_references_this) 105 << ThisE->getSourceRange(); 106 } 107} 108 109bool 110Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 111 SourceLocation EqualLoc) { 112 if (RequireCompleteType(Param->getLocation(), Param->getType(), 113 diag::err_typecheck_decl_incomplete_type)) { 114 Param->setInvalidDecl(); 115 return true; 116 } 117 118 Expr *Arg = (Expr *)DefaultArg.get(); 119 120 // C++ [dcl.fct.default]p5 121 // A default argument expression is implicitly converted (clause 122 // 4) to the parameter type. The default argument expression has 123 // the same semantic constraints as the initializer expression in 124 // a declaration of a variable of the parameter type, using the 125 // copy-initialization semantics (8.5). 126 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 127 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 128 EqualLoc); 129 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 130 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 131 MultiExprArg(*this, (void**)&Arg, 1)); 132 if (Result.isInvalid()) 133 return true; 134 Arg = Result.takeAs<Expr>(); 135 136 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 137 138 // Okay: add the default argument to the parameter 139 Param->setDefaultArg(Arg); 140 141 DefaultArg.release(); 142 143 return false; 144} 145 146/// ActOnParamDefaultArgument - Check whether the default argument 147/// provided for a function parameter is well-formed. If so, attach it 148/// to the parameter declaration. 149void 150Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 151 ExprArg defarg) { 152 if (!param || !defarg.get()) 153 return; 154 155 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 156 UnparsedDefaultArgLocs.erase(Param); 157 158 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 159 160 // Default arguments are only permitted in C++ 161 if (!getLangOptions().CPlusPlus) { 162 Diag(EqualLoc, diag::err_param_default_argument) 163 << DefaultArg->getSourceRange(); 164 Param->setInvalidDecl(); 165 return; 166 } 167 168 // Check that the default argument is well-formed 169 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 170 if (DefaultArgChecker.Visit(DefaultArg.get())) { 171 Param->setInvalidDecl(); 172 return; 173 } 174 175 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 176} 177 178/// ActOnParamUnparsedDefaultArgument - We've seen a default 179/// argument for a function parameter, but we can't parse it yet 180/// because we're inside a class definition. Note that this default 181/// argument will be parsed later. 182void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 183 SourceLocation EqualLoc, 184 SourceLocation ArgLoc) { 185 if (!param) 186 return; 187 188 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 189 if (Param) 190 Param->setUnparsedDefaultArg(); 191 192 UnparsedDefaultArgLocs[Param] = ArgLoc; 193} 194 195/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 196/// the default argument for the parameter param failed. 197void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 198 if (!param) 199 return; 200 201 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 202 203 Param->setInvalidDecl(); 204 205 UnparsedDefaultArgLocs.erase(Param); 206} 207 208/// CheckExtraCXXDefaultArguments - Check for any extra default 209/// arguments in the declarator, which is not a function declaration 210/// or definition and therefore is not permitted to have default 211/// arguments. This routine should be invoked for every declarator 212/// that is not a function declaration or definition. 213void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 214 // C++ [dcl.fct.default]p3 215 // A default argument expression shall be specified only in the 216 // parameter-declaration-clause of a function declaration or in a 217 // template-parameter (14.1). It shall not be specified for a 218 // parameter pack. If it is specified in a 219 // parameter-declaration-clause, it shall not occur within a 220 // declarator or abstract-declarator of a parameter-declaration. 221 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 222 DeclaratorChunk &chunk = D.getTypeObject(i); 223 if (chunk.Kind == DeclaratorChunk::Function) { 224 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 225 ParmVarDecl *Param = 226 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 227 if (Param->hasUnparsedDefaultArg()) { 228 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 229 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 230 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 231 delete Toks; 232 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 233 } else if (Param->getDefaultArg()) { 234 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 235 << Param->getDefaultArg()->getSourceRange(); 236 Param->setDefaultArg(0); 237 } 238 } 239 } 240 } 241} 242 243// MergeCXXFunctionDecl - Merge two declarations of the same C++ 244// function, once we already know that they have the same 245// type. Subroutine of MergeFunctionDecl. Returns true if there was an 246// error, false otherwise. 247bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 248 bool Invalid = false; 249 250 // C++ [dcl.fct.default]p4: 251 // For non-template functions, default arguments can be added in 252 // later declarations of a function in the same 253 // scope. Declarations in different scopes have completely 254 // distinct sets of default arguments. That is, declarations in 255 // inner scopes do not acquire default arguments from 256 // declarations in outer scopes, and vice versa. In a given 257 // function declaration, all parameters subsequent to a 258 // parameter with a default argument shall have default 259 // arguments supplied in this or previous declarations. A 260 // default argument shall not be redefined by a later 261 // declaration (not even to the same value). 262 // 263 // C++ [dcl.fct.default]p6: 264 // Except for member functions of class templates, the default arguments 265 // in a member function definition that appears outside of the class 266 // definition are added to the set of default arguments provided by the 267 // member function declaration in the class definition. 268 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 269 ParmVarDecl *OldParam = Old->getParamDecl(p); 270 ParmVarDecl *NewParam = New->getParamDecl(p); 271 272 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 273 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 274 // hint here. Alternatively, we could walk the type-source information 275 // for NewParam to find the last source location in the type... but it 276 // isn't worth the effort right now. This is the kind of test case that 277 // is hard to get right: 278 279 // int f(int); 280 // void g(int (*fp)(int) = f); 281 // void g(int (*fp)(int) = &f); 282 Diag(NewParam->getLocation(), 283 diag::err_param_default_argument_redefinition) 284 << NewParam->getDefaultArgRange(); 285 286 // Look for the function declaration where the default argument was 287 // actually written, which may be a declaration prior to Old. 288 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 289 Older; Older = Older->getPreviousDeclaration()) { 290 if (!Older->getParamDecl(p)->hasDefaultArg()) 291 break; 292 293 OldParam = Older->getParamDecl(p); 294 } 295 296 Diag(OldParam->getLocation(), diag::note_previous_definition) 297 << OldParam->getDefaultArgRange(); 298 Invalid = true; 299 } else if (OldParam->hasDefaultArg()) { 300 // Merge the old default argument into the new parameter 301 NewParam->setHasInheritedDefaultArg(); 302 if (OldParam->hasUninstantiatedDefaultArg()) 303 NewParam->setUninstantiatedDefaultArg( 304 OldParam->getUninstantiatedDefaultArg()); 305 else 306 NewParam->setDefaultArg(OldParam->getDefaultArg()); 307 } else if (NewParam->hasDefaultArg()) { 308 if (New->getDescribedFunctionTemplate()) { 309 // Paragraph 4, quoted above, only applies to non-template functions. 310 Diag(NewParam->getLocation(), 311 diag::err_param_default_argument_template_redecl) 312 << NewParam->getDefaultArgRange(); 313 Diag(Old->getLocation(), diag::note_template_prev_declaration) 314 << false; 315 } else if (New->getTemplateSpecializationKind() 316 != TSK_ImplicitInstantiation && 317 New->getTemplateSpecializationKind() != TSK_Undeclared) { 318 // C++ [temp.expr.spec]p21: 319 // Default function arguments shall not be specified in a declaration 320 // or a definition for one of the following explicit specializations: 321 // - the explicit specialization of a function template; 322 // - the explicit specialization of a member function template; 323 // - the explicit specialization of a member function of a class 324 // template where the class template specialization to which the 325 // member function specialization belongs is implicitly 326 // instantiated. 327 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 328 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 329 << New->getDeclName() 330 << NewParam->getDefaultArgRange(); 331 } else if (New->getDeclContext()->isDependentContext()) { 332 // C++ [dcl.fct.default]p6 (DR217): 333 // Default arguments for a member function of a class template shall 334 // be specified on the initial declaration of the member function 335 // within the class template. 336 // 337 // Reading the tea leaves a bit in DR217 and its reference to DR205 338 // leads me to the conclusion that one cannot add default function 339 // arguments for an out-of-line definition of a member function of a 340 // dependent type. 341 int WhichKind = 2; 342 if (CXXRecordDecl *Record 343 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 344 if (Record->getDescribedClassTemplate()) 345 WhichKind = 0; 346 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 347 WhichKind = 1; 348 else 349 WhichKind = 2; 350 } 351 352 Diag(NewParam->getLocation(), 353 diag::err_param_default_argument_member_template_redecl) 354 << WhichKind 355 << NewParam->getDefaultArgRange(); 356 } 357 } 358 } 359 360 if (CheckEquivalentExceptionSpec(Old, New)) 361 Invalid = true; 362 363 return Invalid; 364} 365 366/// CheckCXXDefaultArguments - Verify that the default arguments for a 367/// function declaration are well-formed according to C++ 368/// [dcl.fct.default]. 369void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 370 unsigned NumParams = FD->getNumParams(); 371 unsigned p; 372 373 // Find first parameter with a default argument 374 for (p = 0; p < NumParams; ++p) { 375 ParmVarDecl *Param = FD->getParamDecl(p); 376 if (Param->hasDefaultArg()) 377 break; 378 } 379 380 // C++ [dcl.fct.default]p4: 381 // In a given function declaration, all parameters 382 // subsequent to a parameter with a default argument shall 383 // have default arguments supplied in this or previous 384 // declarations. A default argument shall not be redefined 385 // by a later declaration (not even to the same value). 386 unsigned LastMissingDefaultArg = 0; 387 for (; p < NumParams; ++p) { 388 ParmVarDecl *Param = FD->getParamDecl(p); 389 if (!Param->hasDefaultArg()) { 390 if (Param->isInvalidDecl()) 391 /* We already complained about this parameter. */; 392 else if (Param->getIdentifier()) 393 Diag(Param->getLocation(), 394 diag::err_param_default_argument_missing_name) 395 << Param->getIdentifier(); 396 else 397 Diag(Param->getLocation(), 398 diag::err_param_default_argument_missing); 399 400 LastMissingDefaultArg = p; 401 } 402 } 403 404 if (LastMissingDefaultArg > 0) { 405 // Some default arguments were missing. Clear out all of the 406 // default arguments up to (and including) the last missing 407 // default argument, so that we leave the function parameters 408 // in a semantically valid state. 409 for (p = 0; p <= LastMissingDefaultArg; ++p) { 410 ParmVarDecl *Param = FD->getParamDecl(p); 411 if (Param->hasDefaultArg()) { 412 if (!Param->hasUnparsedDefaultArg()) 413 Param->getDefaultArg()->Destroy(Context); 414 Param->setDefaultArg(0); 415 } 416 } 417 } 418} 419 420/// isCurrentClassName - Determine whether the identifier II is the 421/// name of the class type currently being defined. In the case of 422/// nested classes, this will only return true if II is the name of 423/// the innermost class. 424bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 425 const CXXScopeSpec *SS) { 426 assert(getLangOptions().CPlusPlus && "No class names in C!"); 427 428 CXXRecordDecl *CurDecl; 429 if (SS && SS->isSet() && !SS->isInvalid()) { 430 DeclContext *DC = computeDeclContext(*SS, true); 431 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 432 } else 433 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 434 435 if (CurDecl && CurDecl->getIdentifier()) 436 return &II == CurDecl->getIdentifier(); 437 else 438 return false; 439} 440 441/// \brief Check the validity of a C++ base class specifier. 442/// 443/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 444/// and returns NULL otherwise. 445CXXBaseSpecifier * 446Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 447 SourceRange SpecifierRange, 448 bool Virtual, AccessSpecifier Access, 449 QualType BaseType, 450 SourceLocation BaseLoc) { 451 // C++ [class.union]p1: 452 // A union shall not have base classes. 453 if (Class->isUnion()) { 454 Diag(Class->getLocation(), diag::err_base_clause_on_union) 455 << SpecifierRange; 456 return 0; 457 } 458 459 if (BaseType->isDependentType()) 460 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 461 Class->getTagKind() == RecordDecl::TK_class, 462 Access, BaseType); 463 464 // Base specifiers must be record types. 465 if (!BaseType->isRecordType()) { 466 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 467 return 0; 468 } 469 470 // C++ [class.union]p1: 471 // A union shall not be used as a base class. 472 if (BaseType->isUnionType()) { 473 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 474 return 0; 475 } 476 477 // C++ [class.derived]p2: 478 // The class-name in a base-specifier shall not be an incompletely 479 // defined class. 480 if (RequireCompleteType(BaseLoc, BaseType, 481 PDiag(diag::err_incomplete_base_class) 482 << SpecifierRange)) 483 return 0; 484 485 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 486 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 487 assert(BaseDecl && "Record type has no declaration"); 488 BaseDecl = BaseDecl->getDefinition(); 489 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 490 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 491 assert(CXXBaseDecl && "Base type is not a C++ type"); 492 493 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 494 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 495 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 496 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 497 << BaseType; 498 return 0; 499 } 500 501 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 502 503 // Create the base specifier. 504 // FIXME: Allocate via ASTContext? 505 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 506 Class->getTagKind() == RecordDecl::TK_class, 507 Access, BaseType); 508} 509 510void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 511 const CXXRecordDecl *BaseClass, 512 bool BaseIsVirtual) { 513 // A class with a non-empty base class is not empty. 514 // FIXME: Standard ref? 515 if (!BaseClass->isEmpty()) 516 Class->setEmpty(false); 517 518 // C++ [class.virtual]p1: 519 // A class that [...] inherits a virtual function is called a polymorphic 520 // class. 521 if (BaseClass->isPolymorphic()) 522 Class->setPolymorphic(true); 523 524 // C++ [dcl.init.aggr]p1: 525 // An aggregate is [...] a class with [...] no base classes [...]. 526 Class->setAggregate(false); 527 528 // C++ [class]p4: 529 // A POD-struct is an aggregate class... 530 Class->setPOD(false); 531 532 if (BaseIsVirtual) { 533 // C++ [class.ctor]p5: 534 // A constructor is trivial if its class has no virtual base classes. 535 Class->setHasTrivialConstructor(false); 536 537 // C++ [class.copy]p6: 538 // A copy constructor is trivial if its class has no virtual base classes. 539 Class->setHasTrivialCopyConstructor(false); 540 541 // C++ [class.copy]p11: 542 // A copy assignment operator is trivial if its class has no virtual 543 // base classes. 544 Class->setHasTrivialCopyAssignment(false); 545 546 // C++0x [meta.unary.prop] is_empty: 547 // T is a class type, but not a union type, with ... no virtual base 548 // classes 549 Class->setEmpty(false); 550 } else { 551 // C++ [class.ctor]p5: 552 // A constructor is trivial if all the direct base classes of its 553 // class have trivial constructors. 554 if (!BaseClass->hasTrivialConstructor()) 555 Class->setHasTrivialConstructor(false); 556 557 // C++ [class.copy]p6: 558 // A copy constructor is trivial if all the direct base classes of its 559 // class have trivial copy constructors. 560 if (!BaseClass->hasTrivialCopyConstructor()) 561 Class->setHasTrivialCopyConstructor(false); 562 563 // C++ [class.copy]p11: 564 // A copy assignment operator is trivial if all the direct base classes 565 // of its class have trivial copy assignment operators. 566 if (!BaseClass->hasTrivialCopyAssignment()) 567 Class->setHasTrivialCopyAssignment(false); 568 } 569 570 // C++ [class.ctor]p3: 571 // A destructor is trivial if all the direct base classes of its class 572 // have trivial destructors. 573 if (!BaseClass->hasTrivialDestructor()) 574 Class->setHasTrivialDestructor(false); 575} 576 577/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 578/// one entry in the base class list of a class specifier, for 579/// example: 580/// class foo : public bar, virtual private baz { 581/// 'public bar' and 'virtual private baz' are each base-specifiers. 582Sema::BaseResult 583Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 584 bool Virtual, AccessSpecifier Access, 585 TypeTy *basetype, SourceLocation BaseLoc) { 586 if (!classdecl) 587 return true; 588 589 AdjustDeclIfTemplate(classdecl); 590 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 591 if (!Class) 592 return true; 593 594 QualType BaseType = GetTypeFromParser(basetype); 595 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 596 Virtual, Access, 597 BaseType, BaseLoc)) 598 return BaseSpec; 599 600 return true; 601} 602 603/// \brief Performs the actual work of attaching the given base class 604/// specifiers to a C++ class. 605bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 606 unsigned NumBases) { 607 if (NumBases == 0) 608 return false; 609 610 // Used to keep track of which base types we have already seen, so 611 // that we can properly diagnose redundant direct base types. Note 612 // that the key is always the unqualified canonical type of the base 613 // class. 614 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 615 616 // Copy non-redundant base specifiers into permanent storage. 617 unsigned NumGoodBases = 0; 618 bool Invalid = false; 619 for (unsigned idx = 0; idx < NumBases; ++idx) { 620 QualType NewBaseType 621 = Context.getCanonicalType(Bases[idx]->getType()); 622 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 623 624 if (KnownBaseTypes[NewBaseType]) { 625 // C++ [class.mi]p3: 626 // A class shall not be specified as a direct base class of a 627 // derived class more than once. 628 Diag(Bases[idx]->getSourceRange().getBegin(), 629 diag::err_duplicate_base_class) 630 << KnownBaseTypes[NewBaseType]->getType() 631 << Bases[idx]->getSourceRange(); 632 633 // Delete the duplicate base class specifier; we're going to 634 // overwrite its pointer later. 635 Context.Deallocate(Bases[idx]); 636 637 Invalid = true; 638 } else { 639 // Okay, add this new base class. 640 KnownBaseTypes[NewBaseType] = Bases[idx]; 641 Bases[NumGoodBases++] = Bases[idx]; 642 } 643 } 644 645 // Attach the remaining base class specifiers to the derived class. 646 Class->setBases(Bases, NumGoodBases); 647 648 // Delete the remaining (good) base class specifiers, since their 649 // data has been copied into the CXXRecordDecl. 650 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 651 Context.Deallocate(Bases[idx]); 652 653 return Invalid; 654} 655 656/// ActOnBaseSpecifiers - Attach the given base specifiers to the 657/// class, after checking whether there are any duplicate base 658/// classes. 659void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 660 unsigned NumBases) { 661 if (!ClassDecl || !Bases || !NumBases) 662 return; 663 664 AdjustDeclIfTemplate(ClassDecl); 665 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 666 (CXXBaseSpecifier**)(Bases), NumBases); 667} 668 669static CXXRecordDecl *GetClassForType(QualType T) { 670 if (const RecordType *RT = T->getAs<RecordType>()) 671 return cast<CXXRecordDecl>(RT->getDecl()); 672 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 673 return ICT->getDecl(); 674 else 675 return 0; 676} 677 678/// \brief Determine whether the type \p Derived is a C++ class that is 679/// derived from the type \p Base. 680bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 681 if (!getLangOptions().CPlusPlus) 682 return false; 683 684 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 685 if (!DerivedRD) 686 return false; 687 688 CXXRecordDecl *BaseRD = GetClassForType(Base); 689 if (!BaseRD) 690 return false; 691 692 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 693 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 694} 695 696/// \brief Determine whether the type \p Derived is a C++ class that is 697/// derived from the type \p Base. 698bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 699 if (!getLangOptions().CPlusPlus) 700 return false; 701 702 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 703 if (!DerivedRD) 704 return false; 705 706 CXXRecordDecl *BaseRD = GetClassForType(Base); 707 if (!BaseRD) 708 return false; 709 710 return DerivedRD->isDerivedFrom(BaseRD, Paths); 711} 712 713/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 714/// conversion (where Derived and Base are class types) is 715/// well-formed, meaning that the conversion is unambiguous (and 716/// that all of the base classes are accessible). Returns true 717/// and emits a diagnostic if the code is ill-formed, returns false 718/// otherwise. Loc is the location where this routine should point to 719/// if there is an error, and Range is the source range to highlight 720/// if there is an error. 721bool 722Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 723 unsigned InaccessibleBaseID, 724 unsigned AmbigiousBaseConvID, 725 SourceLocation Loc, SourceRange Range, 726 DeclarationName Name) { 727 // First, determine whether the path from Derived to Base is 728 // ambiguous. This is slightly more expensive than checking whether 729 // the Derived to Base conversion exists, because here we need to 730 // explore multiple paths to determine if there is an ambiguity. 731 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 732 /*DetectVirtual=*/false); 733 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 734 assert(DerivationOkay && 735 "Can only be used with a derived-to-base conversion"); 736 (void)DerivationOkay; 737 738 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 739 if (!InaccessibleBaseID) 740 return false; 741 742 // Check that the base class can be accessed. 743 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 744 InaccessibleBaseID)) { 745 case AR_accessible: return false; 746 case AR_inaccessible: return true; 747 case AR_dependent: return false; 748 case AR_delayed: return false; 749 } 750 } 751 752 // We know that the derived-to-base conversion is ambiguous, and 753 // we're going to produce a diagnostic. Perform the derived-to-base 754 // search just one more time to compute all of the possible paths so 755 // that we can print them out. This is more expensive than any of 756 // the previous derived-to-base checks we've done, but at this point 757 // performance isn't as much of an issue. 758 Paths.clear(); 759 Paths.setRecordingPaths(true); 760 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 761 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 762 (void)StillOkay; 763 764 // Build up a textual representation of the ambiguous paths, e.g., 765 // D -> B -> A, that will be used to illustrate the ambiguous 766 // conversions in the diagnostic. We only print one of the paths 767 // to each base class subobject. 768 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 769 770 Diag(Loc, AmbigiousBaseConvID) 771 << Derived << Base << PathDisplayStr << Range << Name; 772 return true; 773} 774 775bool 776Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 777 SourceLocation Loc, SourceRange Range, 778 bool IgnoreAccess) { 779 return CheckDerivedToBaseConversion(Derived, Base, 780 IgnoreAccess ? 0 781 : diag::err_upcast_to_inaccessible_base, 782 diag::err_ambiguous_derived_to_base_conv, 783 Loc, Range, DeclarationName()); 784} 785 786 787/// @brief Builds a string representing ambiguous paths from a 788/// specific derived class to different subobjects of the same base 789/// class. 790/// 791/// This function builds a string that can be used in error messages 792/// to show the different paths that one can take through the 793/// inheritance hierarchy to go from the derived class to different 794/// subobjects of a base class. The result looks something like this: 795/// @code 796/// struct D -> struct B -> struct A 797/// struct D -> struct C -> struct A 798/// @endcode 799std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 800 std::string PathDisplayStr; 801 std::set<unsigned> DisplayedPaths; 802 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 803 Path != Paths.end(); ++Path) { 804 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 805 // We haven't displayed a path to this particular base 806 // class subobject yet. 807 PathDisplayStr += "\n "; 808 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 809 for (CXXBasePath::const_iterator Element = Path->begin(); 810 Element != Path->end(); ++Element) 811 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 812 } 813 } 814 815 return PathDisplayStr; 816} 817 818//===----------------------------------------------------------------------===// 819// C++ class member Handling 820//===----------------------------------------------------------------------===// 821 822/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 823/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 824/// bitfield width if there is one and 'InitExpr' specifies the initializer if 825/// any. 826Sema::DeclPtrTy 827Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 828 MultiTemplateParamsArg TemplateParameterLists, 829 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 830 bool Deleted) { 831 const DeclSpec &DS = D.getDeclSpec(); 832 DeclarationName Name = GetNameForDeclarator(D); 833 Expr *BitWidth = static_cast<Expr*>(BW); 834 Expr *Init = static_cast<Expr*>(InitExpr); 835 SourceLocation Loc = D.getIdentifierLoc(); 836 837 bool isFunc = D.isFunctionDeclarator(); 838 839 assert(!DS.isFriendSpecified()); 840 841 // C++ 9.2p6: A member shall not be declared to have automatic storage 842 // duration (auto, register) or with the extern storage-class-specifier. 843 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 844 // data members and cannot be applied to names declared const or static, 845 // and cannot be applied to reference members. 846 switch (DS.getStorageClassSpec()) { 847 case DeclSpec::SCS_unspecified: 848 case DeclSpec::SCS_typedef: 849 case DeclSpec::SCS_static: 850 // FALL THROUGH. 851 break; 852 case DeclSpec::SCS_mutable: 853 if (isFunc) { 854 if (DS.getStorageClassSpecLoc().isValid()) 855 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 856 else 857 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 858 859 // FIXME: It would be nicer if the keyword was ignored only for this 860 // declarator. Otherwise we could get follow-up errors. 861 D.getMutableDeclSpec().ClearStorageClassSpecs(); 862 } else { 863 QualType T = GetTypeForDeclarator(D, S); 864 diag::kind err = static_cast<diag::kind>(0); 865 if (T->isReferenceType()) 866 err = diag::err_mutable_reference; 867 else if (T.isConstQualified()) 868 err = diag::err_mutable_const; 869 if (err != 0) { 870 if (DS.getStorageClassSpecLoc().isValid()) 871 Diag(DS.getStorageClassSpecLoc(), err); 872 else 873 Diag(DS.getThreadSpecLoc(), err); 874 // FIXME: It would be nicer if the keyword was ignored only for this 875 // declarator. Otherwise we could get follow-up errors. 876 D.getMutableDeclSpec().ClearStorageClassSpecs(); 877 } 878 } 879 break; 880 default: 881 if (DS.getStorageClassSpecLoc().isValid()) 882 Diag(DS.getStorageClassSpecLoc(), 883 diag::err_storageclass_invalid_for_member); 884 else 885 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 886 D.getMutableDeclSpec().ClearStorageClassSpecs(); 887 } 888 889 if (!isFunc && 890 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 891 D.getNumTypeObjects() == 0) { 892 // Check also for this case: 893 // 894 // typedef int f(); 895 // f a; 896 // 897 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 898 isFunc = TDType->isFunctionType(); 899 } 900 901 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 902 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 903 !isFunc); 904 905 Decl *Member; 906 if (isInstField) { 907 // FIXME: Check for template parameters! 908 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 909 AS); 910 assert(Member && "HandleField never returns null"); 911 } else { 912 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 913 .getAs<Decl>(); 914 if (!Member) { 915 if (BitWidth) DeleteExpr(BitWidth); 916 return DeclPtrTy(); 917 } 918 919 // Non-instance-fields can't have a bitfield. 920 if (BitWidth) { 921 if (Member->isInvalidDecl()) { 922 // don't emit another diagnostic. 923 } else if (isa<VarDecl>(Member)) { 924 // C++ 9.6p3: A bit-field shall not be a static member. 925 // "static member 'A' cannot be a bit-field" 926 Diag(Loc, diag::err_static_not_bitfield) 927 << Name << BitWidth->getSourceRange(); 928 } else if (isa<TypedefDecl>(Member)) { 929 // "typedef member 'x' cannot be a bit-field" 930 Diag(Loc, diag::err_typedef_not_bitfield) 931 << Name << BitWidth->getSourceRange(); 932 } else { 933 // A function typedef ("typedef int f(); f a;"). 934 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 935 Diag(Loc, diag::err_not_integral_type_bitfield) 936 << Name << cast<ValueDecl>(Member)->getType() 937 << BitWidth->getSourceRange(); 938 } 939 940 DeleteExpr(BitWidth); 941 BitWidth = 0; 942 Member->setInvalidDecl(); 943 } 944 945 Member->setAccess(AS); 946 947 // If we have declared a member function template, set the access of the 948 // templated declaration as well. 949 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 950 FunTmpl->getTemplatedDecl()->setAccess(AS); 951 } 952 953 assert((Name || isInstField) && "No identifier for non-field ?"); 954 955 if (Init) 956 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 957 if (Deleted) // FIXME: Source location is not very good. 958 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 959 960 if (isInstField) { 961 FieldCollector->Add(cast<FieldDecl>(Member)); 962 return DeclPtrTy(); 963 } 964 return DeclPtrTy::make(Member); 965} 966 967/// \brief Find the direct and/or virtual base specifiers that 968/// correspond to the given base type, for use in base initialization 969/// within a constructor. 970static bool FindBaseInitializer(Sema &SemaRef, 971 CXXRecordDecl *ClassDecl, 972 QualType BaseType, 973 const CXXBaseSpecifier *&DirectBaseSpec, 974 const CXXBaseSpecifier *&VirtualBaseSpec) { 975 // First, check for a direct base class. 976 DirectBaseSpec = 0; 977 for (CXXRecordDecl::base_class_const_iterator Base 978 = ClassDecl->bases_begin(); 979 Base != ClassDecl->bases_end(); ++Base) { 980 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 981 // We found a direct base of this type. That's what we're 982 // initializing. 983 DirectBaseSpec = &*Base; 984 break; 985 } 986 } 987 988 // Check for a virtual base class. 989 // FIXME: We might be able to short-circuit this if we know in advance that 990 // there are no virtual bases. 991 VirtualBaseSpec = 0; 992 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 993 // We haven't found a base yet; search the class hierarchy for a 994 // virtual base class. 995 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 996 /*DetectVirtual=*/false); 997 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 998 BaseType, Paths)) { 999 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1000 Path != Paths.end(); ++Path) { 1001 if (Path->back().Base->isVirtual()) { 1002 VirtualBaseSpec = Path->back().Base; 1003 break; 1004 } 1005 } 1006 } 1007 } 1008 1009 return DirectBaseSpec || VirtualBaseSpec; 1010} 1011 1012/// ActOnMemInitializer - Handle a C++ member initializer. 1013Sema::MemInitResult 1014Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1015 Scope *S, 1016 const CXXScopeSpec &SS, 1017 IdentifierInfo *MemberOrBase, 1018 TypeTy *TemplateTypeTy, 1019 SourceLocation IdLoc, 1020 SourceLocation LParenLoc, 1021 ExprTy **Args, unsigned NumArgs, 1022 SourceLocation *CommaLocs, 1023 SourceLocation RParenLoc) { 1024 if (!ConstructorD) 1025 return true; 1026 1027 AdjustDeclIfTemplate(ConstructorD); 1028 1029 CXXConstructorDecl *Constructor 1030 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1031 if (!Constructor) { 1032 // The user wrote a constructor initializer on a function that is 1033 // not a C++ constructor. Ignore the error for now, because we may 1034 // have more member initializers coming; we'll diagnose it just 1035 // once in ActOnMemInitializers. 1036 return true; 1037 } 1038 1039 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1040 1041 // C++ [class.base.init]p2: 1042 // Names in a mem-initializer-id are looked up in the scope of the 1043 // constructor’s class and, if not found in that scope, are looked 1044 // up in the scope containing the constructor’s 1045 // definition. [Note: if the constructor’s class contains a member 1046 // with the same name as a direct or virtual base class of the 1047 // class, a mem-initializer-id naming the member or base class and 1048 // composed of a single identifier refers to the class member. A 1049 // mem-initializer-id for the hidden base class may be specified 1050 // using a qualified name. ] 1051 if (!SS.getScopeRep() && !TemplateTypeTy) { 1052 // Look for a member, first. 1053 FieldDecl *Member = 0; 1054 DeclContext::lookup_result Result 1055 = ClassDecl->lookup(MemberOrBase); 1056 if (Result.first != Result.second) 1057 Member = dyn_cast<FieldDecl>(*Result.first); 1058 1059 // FIXME: Handle members of an anonymous union. 1060 1061 if (Member) 1062 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1063 LParenLoc, RParenLoc); 1064 } 1065 // It didn't name a member, so see if it names a class. 1066 QualType BaseType; 1067 TypeSourceInfo *TInfo = 0; 1068 1069 if (TemplateTypeTy) { 1070 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1071 } else { 1072 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1073 LookupParsedName(R, S, &SS); 1074 1075 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1076 if (!TyD) { 1077 if (R.isAmbiguous()) return true; 1078 1079 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1080 bool NotUnknownSpecialization = false; 1081 DeclContext *DC = computeDeclContext(SS, false); 1082 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1083 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1084 1085 if (!NotUnknownSpecialization) { 1086 // When the scope specifier can refer to a member of an unknown 1087 // specialization, we take it as a type name. 1088 BaseType = CheckTypenameType((NestedNameSpecifier *)SS.getScopeRep(), 1089 *MemberOrBase, SS.getRange()); 1090 if (BaseType.isNull()) 1091 return true; 1092 1093 R.clear(); 1094 } 1095 } 1096 1097 // If no results were found, try to correct typos. 1098 if (R.empty() && BaseType.isNull() && 1099 CorrectTypo(R, S, &SS, ClassDecl) && R.isSingleResult()) { 1100 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1101 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1102 // We have found a non-static data member with a similar 1103 // name to what was typed; complain and initialize that 1104 // member. 1105 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1106 << MemberOrBase << true << R.getLookupName() 1107 << CodeModificationHint::CreateReplacement(R.getNameLoc(), 1108 R.getLookupName().getAsString()); 1109 Diag(Member->getLocation(), diag::note_previous_decl) 1110 << Member->getDeclName(); 1111 1112 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1113 LParenLoc, RParenLoc); 1114 } 1115 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1116 const CXXBaseSpecifier *DirectBaseSpec; 1117 const CXXBaseSpecifier *VirtualBaseSpec; 1118 if (FindBaseInitializer(*this, ClassDecl, 1119 Context.getTypeDeclType(Type), 1120 DirectBaseSpec, VirtualBaseSpec)) { 1121 // We have found a direct or virtual base class with a 1122 // similar name to what was typed; complain and initialize 1123 // that base class. 1124 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1125 << MemberOrBase << false << R.getLookupName() 1126 << CodeModificationHint::CreateReplacement(R.getNameLoc(), 1127 R.getLookupName().getAsString()); 1128 1129 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1130 : VirtualBaseSpec; 1131 Diag(BaseSpec->getSourceRange().getBegin(), 1132 diag::note_base_class_specified_here) 1133 << BaseSpec->getType() 1134 << BaseSpec->getSourceRange(); 1135 1136 TyD = Type; 1137 } 1138 } 1139 } 1140 1141 if (!TyD && BaseType.isNull()) { 1142 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1143 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1144 return true; 1145 } 1146 } 1147 1148 if (BaseType.isNull()) { 1149 BaseType = Context.getTypeDeclType(TyD); 1150 if (SS.isSet()) { 1151 NestedNameSpecifier *Qualifier = 1152 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1153 1154 // FIXME: preserve source range information 1155 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1156 } 1157 } 1158 } 1159 1160 if (!TInfo) 1161 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1162 1163 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1164 LParenLoc, RParenLoc, ClassDecl); 1165} 1166 1167/// Checks an initializer expression for use of uninitialized fields, such as 1168/// containing the field that is being initialized. Returns true if there is an 1169/// uninitialized field was used an updates the SourceLocation parameter; false 1170/// otherwise. 1171static bool InitExprContainsUninitializedFields(const Stmt* S, 1172 const FieldDecl* LhsField, 1173 SourceLocation* L) { 1174 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1175 if (ME) { 1176 const NamedDecl* RhsField = ME->getMemberDecl(); 1177 if (RhsField == LhsField) { 1178 // Initializing a field with itself. Throw a warning. 1179 // But wait; there are exceptions! 1180 // Exception #1: The field may not belong to this record. 1181 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1182 const Expr* base = ME->getBase(); 1183 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1184 // Even though the field matches, it does not belong to this record. 1185 return false; 1186 } 1187 // None of the exceptions triggered; return true to indicate an 1188 // uninitialized field was used. 1189 *L = ME->getMemberLoc(); 1190 return true; 1191 } 1192 } 1193 bool found = false; 1194 for (Stmt::const_child_iterator it = S->child_begin(); 1195 it != S->child_end() && found == false; 1196 ++it) { 1197 if (isa<CallExpr>(S)) { 1198 // Do not descend into function calls or constructors, as the use 1199 // of an uninitialized field may be valid. One would have to inspect 1200 // the contents of the function/ctor to determine if it is safe or not. 1201 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1202 // may be safe, depending on what the function/ctor does. 1203 continue; 1204 } 1205 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1206 } 1207 return found; 1208} 1209 1210Sema::MemInitResult 1211Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1212 unsigned NumArgs, SourceLocation IdLoc, 1213 SourceLocation LParenLoc, 1214 SourceLocation RParenLoc) { 1215 // Diagnose value-uses of fields to initialize themselves, e.g. 1216 // foo(foo) 1217 // where foo is not also a parameter to the constructor. 1218 // TODO: implement -Wuninitialized and fold this into that framework. 1219 for (unsigned i = 0; i < NumArgs; ++i) { 1220 SourceLocation L; 1221 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1222 // FIXME: Return true in the case when other fields are used before being 1223 // uninitialized. For example, let this field be the i'th field. When 1224 // initializing the i'th field, throw a warning if any of the >= i'th 1225 // fields are used, as they are not yet initialized. 1226 // Right now we are only handling the case where the i'th field uses 1227 // itself in its initializer. 1228 Diag(L, diag::warn_field_is_uninit); 1229 } 1230 } 1231 1232 bool HasDependentArg = false; 1233 for (unsigned i = 0; i < NumArgs; i++) 1234 HasDependentArg |= Args[i]->isTypeDependent(); 1235 1236 QualType FieldType = Member->getType(); 1237 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1238 FieldType = Array->getElementType(); 1239 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1240 if (FieldType->isDependentType() || HasDependentArg) { 1241 // Can't check initialization for a member of dependent type or when 1242 // any of the arguments are type-dependent expressions. 1243 OwningExprResult Init 1244 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1245 RParenLoc)); 1246 1247 // Erase any temporaries within this evaluation context; we're not 1248 // going to track them in the AST, since we'll be rebuilding the 1249 // ASTs during template instantiation. 1250 ExprTemporaries.erase( 1251 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1252 ExprTemporaries.end()); 1253 1254 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1255 LParenLoc, 1256 Init.takeAs<Expr>(), 1257 RParenLoc); 1258 1259 } 1260 1261 if (Member->isInvalidDecl()) 1262 return true; 1263 1264 // Initialize the member. 1265 InitializedEntity MemberEntity = 1266 InitializedEntity::InitializeMember(Member, 0); 1267 InitializationKind Kind = 1268 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1269 1270 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1271 1272 OwningExprResult MemberInit = 1273 InitSeq.Perform(*this, MemberEntity, Kind, 1274 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1275 if (MemberInit.isInvalid()) 1276 return true; 1277 1278 // C++0x [class.base.init]p7: 1279 // The initialization of each base and member constitutes a 1280 // full-expression. 1281 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1282 if (MemberInit.isInvalid()) 1283 return true; 1284 1285 // If we are in a dependent context, template instantiation will 1286 // perform this type-checking again. Just save the arguments that we 1287 // received in a ParenListExpr. 1288 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1289 // of the information that we have about the member 1290 // initializer. However, deconstructing the ASTs is a dicey process, 1291 // and this approach is far more likely to get the corner cases right. 1292 if (CurContext->isDependentContext()) { 1293 // Bump the reference count of all of the arguments. 1294 for (unsigned I = 0; I != NumArgs; ++I) 1295 Args[I]->Retain(); 1296 1297 OwningExprResult Init 1298 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1299 RParenLoc)); 1300 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1301 LParenLoc, 1302 Init.takeAs<Expr>(), 1303 RParenLoc); 1304 } 1305 1306 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1307 LParenLoc, 1308 MemberInit.takeAs<Expr>(), 1309 RParenLoc); 1310} 1311 1312Sema::MemInitResult 1313Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1314 Expr **Args, unsigned NumArgs, 1315 SourceLocation LParenLoc, SourceLocation RParenLoc, 1316 CXXRecordDecl *ClassDecl) { 1317 bool HasDependentArg = false; 1318 for (unsigned i = 0; i < NumArgs; i++) 1319 HasDependentArg |= Args[i]->isTypeDependent(); 1320 1321 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1322 if (BaseType->isDependentType() || HasDependentArg) { 1323 // Can't check initialization for a base of dependent type or when 1324 // any of the arguments are type-dependent expressions. 1325 OwningExprResult BaseInit 1326 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1327 RParenLoc)); 1328 1329 // Erase any temporaries within this evaluation context; we're not 1330 // going to track them in the AST, since we'll be rebuilding the 1331 // ASTs during template instantiation. 1332 ExprTemporaries.erase( 1333 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1334 ExprTemporaries.end()); 1335 1336 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1337 LParenLoc, 1338 BaseInit.takeAs<Expr>(), 1339 RParenLoc); 1340 } 1341 1342 if (!BaseType->isRecordType()) 1343 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1344 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1345 1346 // C++ [class.base.init]p2: 1347 // [...] Unless the mem-initializer-id names a nonstatic data 1348 // member of the constructor’s class or a direct or virtual base 1349 // of that class, the mem-initializer is ill-formed. A 1350 // mem-initializer-list can initialize a base class using any 1351 // name that denotes that base class type. 1352 1353 // Check for direct and virtual base classes. 1354 const CXXBaseSpecifier *DirectBaseSpec = 0; 1355 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1356 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1357 VirtualBaseSpec); 1358 1359 // C++ [base.class.init]p2: 1360 // If a mem-initializer-id is ambiguous because it designates both 1361 // a direct non-virtual base class and an inherited virtual base 1362 // class, the mem-initializer is ill-formed. 1363 if (DirectBaseSpec && VirtualBaseSpec) 1364 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1365 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1366 // C++ [base.class.init]p2: 1367 // Unless the mem-initializer-id names a nonstatic data membeer of the 1368 // constructor's class ot a direst or virtual base of that class, the 1369 // mem-initializer is ill-formed. 1370 if (!DirectBaseSpec && !VirtualBaseSpec) 1371 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1372 << BaseType << ClassDecl->getNameAsCString() 1373 << BaseTInfo->getTypeLoc().getSourceRange(); 1374 1375 CXXBaseSpecifier *BaseSpec 1376 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1377 if (!BaseSpec) 1378 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1379 1380 // Initialize the base. 1381 InitializedEntity BaseEntity = 1382 InitializedEntity::InitializeBase(Context, BaseSpec); 1383 InitializationKind Kind = 1384 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1385 1386 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1387 1388 OwningExprResult BaseInit = 1389 InitSeq.Perform(*this, BaseEntity, Kind, 1390 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1391 if (BaseInit.isInvalid()) 1392 return true; 1393 1394 // C++0x [class.base.init]p7: 1395 // The initialization of each base and member constitutes a 1396 // full-expression. 1397 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1398 if (BaseInit.isInvalid()) 1399 return true; 1400 1401 // If we are in a dependent context, template instantiation will 1402 // perform this type-checking again. Just save the arguments that we 1403 // received in a ParenListExpr. 1404 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1405 // of the information that we have about the base 1406 // initializer. However, deconstructing the ASTs is a dicey process, 1407 // and this approach is far more likely to get the corner cases right. 1408 if (CurContext->isDependentContext()) { 1409 // Bump the reference count of all of the arguments. 1410 for (unsigned I = 0; I != NumArgs; ++I) 1411 Args[I]->Retain(); 1412 1413 OwningExprResult Init 1414 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1415 RParenLoc)); 1416 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1417 LParenLoc, 1418 Init.takeAs<Expr>(), 1419 RParenLoc); 1420 } 1421 1422 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1423 LParenLoc, 1424 BaseInit.takeAs<Expr>(), 1425 RParenLoc); 1426} 1427 1428bool 1429Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1430 CXXBaseOrMemberInitializer **Initializers, 1431 unsigned NumInitializers, 1432 bool IsImplicitConstructor, 1433 bool AnyErrors) { 1434 // We need to build the initializer AST according to order of construction 1435 // and not what user specified in the Initializers list. 1436 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1437 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1438 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1439 bool HasDependentBaseInit = false; 1440 bool HadError = false; 1441 1442 for (unsigned i = 0; i < NumInitializers; i++) { 1443 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1444 if (Member->isBaseInitializer()) { 1445 if (Member->getBaseClass()->isDependentType()) 1446 HasDependentBaseInit = true; 1447 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1448 } else { 1449 AllBaseFields[Member->getMember()] = Member; 1450 } 1451 } 1452 1453 if (HasDependentBaseInit) { 1454 // FIXME. This does not preserve the ordering of the initializers. 1455 // Try (with -Wreorder) 1456 // template<class X> struct A {}; 1457 // template<class X> struct B : A<X> { 1458 // B() : x1(10), A<X>() {} 1459 // int x1; 1460 // }; 1461 // B<int> x; 1462 // On seeing one dependent type, we should essentially exit this routine 1463 // while preserving user-declared initializer list. When this routine is 1464 // called during instantiatiation process, this routine will rebuild the 1465 // ordered initializer list correctly. 1466 1467 // If we have a dependent base initialization, we can't determine the 1468 // association between initializers and bases; just dump the known 1469 // initializers into the list, and don't try to deal with other bases. 1470 for (unsigned i = 0; i < NumInitializers; i++) { 1471 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1472 if (Member->isBaseInitializer()) 1473 AllToInit.push_back(Member); 1474 } 1475 } else { 1476 llvm::SmallVector<CXXBaseSpecifier *, 4> BasesToDefaultInit; 1477 1478 // Push virtual bases before others. 1479 for (CXXRecordDecl::base_class_iterator VBase = 1480 ClassDecl->vbases_begin(), 1481 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1482 if (VBase->getType()->isDependentType()) 1483 continue; 1484 if (CXXBaseOrMemberInitializer *Value 1485 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1486 AllToInit.push_back(Value); 1487 } else if (!AnyErrors) { 1488 InitializedEntity InitEntity 1489 = InitializedEntity::InitializeBase(Context, VBase); 1490 InitializationKind InitKind 1491 = InitializationKind::CreateDefault(Constructor->getLocation()); 1492 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1493 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1494 MultiExprArg(*this, 0, 0)); 1495 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1496 if (BaseInit.isInvalid()) { 1497 HadError = true; 1498 continue; 1499 } 1500 1501 // Don't attach synthesized base initializers in a dependent 1502 // context; they'll be checked again at template instantiation 1503 // time. 1504 if (CurContext->isDependentContext()) 1505 continue; 1506 1507 CXXBaseOrMemberInitializer *CXXBaseInit = 1508 new (Context) CXXBaseOrMemberInitializer(Context, 1509 Context.getTrivialTypeSourceInfo(VBase->getType(), 1510 SourceLocation()), 1511 SourceLocation(), 1512 BaseInit.takeAs<Expr>(), 1513 SourceLocation()); 1514 AllToInit.push_back(CXXBaseInit); 1515 } 1516 } 1517 1518 for (CXXRecordDecl::base_class_iterator Base = 1519 ClassDecl->bases_begin(), 1520 E = ClassDecl->bases_end(); Base != E; ++Base) { 1521 // Virtuals are in the virtual base list and already constructed. 1522 if (Base->isVirtual()) 1523 continue; 1524 // Skip dependent types. 1525 if (Base->getType()->isDependentType()) 1526 continue; 1527 if (CXXBaseOrMemberInitializer *Value 1528 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1529 AllToInit.push_back(Value); 1530 } 1531 else if (!AnyErrors) { 1532 InitializedEntity InitEntity 1533 = InitializedEntity::InitializeBase(Context, Base); 1534 InitializationKind InitKind 1535 = InitializationKind::CreateDefault(Constructor->getLocation()); 1536 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1537 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1538 MultiExprArg(*this, 0, 0)); 1539 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1540 if (BaseInit.isInvalid()) { 1541 HadError = true; 1542 continue; 1543 } 1544 1545 // Don't attach synthesized base initializers in a dependent 1546 // context; they'll be regenerated at template instantiation 1547 // time. 1548 if (CurContext->isDependentContext()) 1549 continue; 1550 1551 CXXBaseOrMemberInitializer *CXXBaseInit = 1552 new (Context) CXXBaseOrMemberInitializer(Context, 1553 Context.getTrivialTypeSourceInfo(Base->getType(), 1554 SourceLocation()), 1555 SourceLocation(), 1556 BaseInit.takeAs<Expr>(), 1557 SourceLocation()); 1558 AllToInit.push_back(CXXBaseInit); 1559 } 1560 } 1561 } 1562 1563 // non-static data members. 1564 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1565 E = ClassDecl->field_end(); Field != E; ++Field) { 1566 if ((*Field)->isAnonymousStructOrUnion()) { 1567 if (const RecordType *FieldClassType = 1568 Field->getType()->getAs<RecordType>()) { 1569 CXXRecordDecl *FieldClassDecl 1570 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1571 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1572 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1573 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1574 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1575 // set to the anonymous union data member used in the initializer 1576 // list. 1577 Value->setMember(*Field); 1578 Value->setAnonUnionMember(*FA); 1579 AllToInit.push_back(Value); 1580 break; 1581 } 1582 } 1583 } 1584 continue; 1585 } 1586 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1587 AllToInit.push_back(Value); 1588 continue; 1589 } 1590 1591 if ((*Field)->getType()->isDependentType() || AnyErrors) 1592 continue; 1593 1594 QualType FT = Context.getBaseElementType((*Field)->getType()); 1595 if (FT->getAs<RecordType>()) { 1596 InitializedEntity InitEntity 1597 = InitializedEntity::InitializeMember(*Field); 1598 InitializationKind InitKind 1599 = InitializationKind::CreateDefault(Constructor->getLocation()); 1600 1601 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1602 OwningExprResult MemberInit = InitSeq.Perform(*this, InitEntity, InitKind, 1603 MultiExprArg(*this, 0, 0)); 1604 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1605 if (MemberInit.isInvalid()) { 1606 HadError = true; 1607 continue; 1608 } 1609 1610 // Don't attach synthesized member initializers in a dependent 1611 // context; they'll be regenerated a template instantiation 1612 // time. 1613 if (CurContext->isDependentContext()) 1614 continue; 1615 1616 CXXBaseOrMemberInitializer *Member = 1617 new (Context) CXXBaseOrMemberInitializer(Context, 1618 *Field, SourceLocation(), 1619 SourceLocation(), 1620 MemberInit.takeAs<Expr>(), 1621 SourceLocation()); 1622 1623 AllToInit.push_back(Member); 1624 } 1625 else if (FT->isReferenceType()) { 1626 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1627 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1628 << 0 << (*Field)->getDeclName(); 1629 Diag((*Field)->getLocation(), diag::note_declared_at); 1630 HadError = true; 1631 } 1632 else if (FT.isConstQualified()) { 1633 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1634 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1635 << 1 << (*Field)->getDeclName(); 1636 Diag((*Field)->getLocation(), diag::note_declared_at); 1637 HadError = true; 1638 } 1639 } 1640 1641 NumInitializers = AllToInit.size(); 1642 if (NumInitializers > 0) { 1643 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1644 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1645 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1646 memcpy(baseOrMemberInitializers, AllToInit.data(), 1647 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1648 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1649 1650 // Constructors implicitly reference the base and member 1651 // destructors. 1652 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1653 Constructor->getParent()); 1654 } 1655 1656 return HadError; 1657} 1658 1659static void *GetKeyForTopLevelField(FieldDecl *Field) { 1660 // For anonymous unions, use the class declaration as the key. 1661 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1662 if (RT->getDecl()->isAnonymousStructOrUnion()) 1663 return static_cast<void *>(RT->getDecl()); 1664 } 1665 return static_cast<void *>(Field); 1666} 1667 1668static void *GetKeyForBase(QualType BaseType) { 1669 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1670 return (void *)RT; 1671 1672 assert(0 && "Unexpected base type!"); 1673 return 0; 1674} 1675 1676static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1677 bool MemberMaybeAnon = false) { 1678 // For fields injected into the class via declaration of an anonymous union, 1679 // use its anonymous union class declaration as the unique key. 1680 if (Member->isMemberInitializer()) { 1681 FieldDecl *Field = Member->getMember(); 1682 1683 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1684 // data member of the class. Data member used in the initializer list is 1685 // in AnonUnionMember field. 1686 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1687 Field = Member->getAnonUnionMember(); 1688 if (Field->getDeclContext()->isRecord()) { 1689 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 1690 if (RD->isAnonymousStructOrUnion()) 1691 return static_cast<void *>(RD); 1692 } 1693 return static_cast<void *>(Field); 1694 } 1695 1696 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1697} 1698 1699/// ActOnMemInitializers - Handle the member initializers for a constructor. 1700void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1701 SourceLocation ColonLoc, 1702 MemInitTy **MemInits, unsigned NumMemInits, 1703 bool AnyErrors) { 1704 if (!ConstructorDecl) 1705 return; 1706 1707 AdjustDeclIfTemplate(ConstructorDecl); 1708 1709 CXXConstructorDecl *Constructor 1710 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1711 1712 if (!Constructor) { 1713 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1714 return; 1715 } 1716 1717 if (!Constructor->isDependentContext()) { 1718 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 1719 bool err = false; 1720 for (unsigned i = 0; i < NumMemInits; i++) { 1721 CXXBaseOrMemberInitializer *Member = 1722 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1723 void *KeyToMember = GetKeyForMember(Member); 1724 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1725 if (!PrevMember) { 1726 PrevMember = Member; 1727 continue; 1728 } 1729 if (FieldDecl *Field = Member->getMember()) 1730 Diag(Member->getSourceLocation(), 1731 diag::error_multiple_mem_initialization) 1732 << Field->getNameAsString() 1733 << Member->getSourceRange(); 1734 else { 1735 Type *BaseClass = Member->getBaseClass(); 1736 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1737 Diag(Member->getSourceLocation(), 1738 diag::error_multiple_base_initialization) 1739 << QualType(BaseClass, 0) 1740 << Member->getSourceRange(); 1741 } 1742 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1743 << 0; 1744 err = true; 1745 } 1746 1747 if (err) 1748 return; 1749 } 1750 1751 SetBaseOrMemberInitializers(Constructor, 1752 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 1753 NumMemInits, false, AnyErrors); 1754 1755 if (Constructor->isDependentContext()) 1756 return; 1757 1758 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1759 Diagnostic::Ignored && 1760 Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1761 Diagnostic::Ignored) 1762 return; 1763 1764 // Also issue warning if order of ctor-initializer list does not match order 1765 // of 1) base class declarations and 2) order of non-static data members. 1766 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1767 1768 CXXRecordDecl *ClassDecl 1769 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1770 // Push virtual bases before others. 1771 for (CXXRecordDecl::base_class_iterator VBase = 1772 ClassDecl->vbases_begin(), 1773 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1774 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1775 1776 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1777 E = ClassDecl->bases_end(); Base != E; ++Base) { 1778 // Virtuals are alread in the virtual base list and are constructed 1779 // first. 1780 if (Base->isVirtual()) 1781 continue; 1782 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1783 } 1784 1785 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1786 E = ClassDecl->field_end(); Field != E; ++Field) 1787 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1788 1789 int Last = AllBaseOrMembers.size(); 1790 int curIndex = 0; 1791 CXXBaseOrMemberInitializer *PrevMember = 0; 1792 for (unsigned i = 0; i < NumMemInits; i++) { 1793 CXXBaseOrMemberInitializer *Member = 1794 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1795 void *MemberInCtorList = GetKeyForMember(Member, true); 1796 1797 for (; curIndex < Last; curIndex++) 1798 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1799 break; 1800 if (curIndex == Last) { 1801 assert(PrevMember && "Member not in member list?!"); 1802 // Initializer as specified in ctor-initializer list is out of order. 1803 // Issue a warning diagnostic. 1804 if (PrevMember->isBaseInitializer()) { 1805 // Diagnostics is for an initialized base class. 1806 Type *BaseClass = PrevMember->getBaseClass(); 1807 Diag(PrevMember->getSourceLocation(), 1808 diag::warn_base_initialized) 1809 << QualType(BaseClass, 0); 1810 } else { 1811 FieldDecl *Field = PrevMember->getMember(); 1812 Diag(PrevMember->getSourceLocation(), 1813 diag::warn_field_initialized) 1814 << Field->getNameAsString(); 1815 } 1816 // Also the note! 1817 if (FieldDecl *Field = Member->getMember()) 1818 Diag(Member->getSourceLocation(), 1819 diag::note_fieldorbase_initialized_here) << 0 1820 << Field->getNameAsString(); 1821 else { 1822 Type *BaseClass = Member->getBaseClass(); 1823 Diag(Member->getSourceLocation(), 1824 diag::note_fieldorbase_initialized_here) << 1 1825 << QualType(BaseClass, 0); 1826 } 1827 for (curIndex = 0; curIndex < Last; curIndex++) 1828 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1829 break; 1830 } 1831 PrevMember = Member; 1832 } 1833} 1834 1835void 1836Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 1837 CXXRecordDecl *ClassDecl) { 1838 // Ignore dependent contexts. 1839 if (ClassDecl->isDependentContext()) 1840 return; 1841 1842 // FIXME: all the access-control diagnostics are positioned on the 1843 // field/base declaration. That's probably good; that said, the 1844 // user might reasonably want to know why the destructor is being 1845 // emitted, and we currently don't say. 1846 1847 // Non-static data members. 1848 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1849 E = ClassDecl->field_end(); I != E; ++I) { 1850 FieldDecl *Field = *I; 1851 1852 QualType FieldType = Context.getBaseElementType(Field->getType()); 1853 1854 const RecordType* RT = FieldType->getAs<RecordType>(); 1855 if (!RT) 1856 continue; 1857 1858 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1859 if (FieldClassDecl->hasTrivialDestructor()) 1860 continue; 1861 1862 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1863 CheckDestructorAccess(Field->getLocation(), Dtor, 1864 PartialDiagnostic(diag::err_access_dtor_field) 1865 << Field->getDeclName() 1866 << FieldType); 1867 1868 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1869 } 1870 1871 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 1872 1873 // Bases. 1874 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1875 E = ClassDecl->bases_end(); Base != E; ++Base) { 1876 // Bases are always records in a well-formed non-dependent class. 1877 const RecordType *RT = Base->getType()->getAs<RecordType>(); 1878 1879 // Remember direct virtual bases. 1880 if (Base->isVirtual()) 1881 DirectVirtualBases.insert(RT); 1882 1883 // Ignore trivial destructors. 1884 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1885 if (BaseClassDecl->hasTrivialDestructor()) 1886 continue; 1887 1888 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1889 1890 // FIXME: caret should be on the start of the class name 1891 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 1892 PartialDiagnostic(diag::err_access_dtor_base) 1893 << Base->getType() 1894 << Base->getSourceRange()); 1895 1896 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1897 } 1898 1899 // Virtual bases. 1900 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1901 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1902 1903 // Bases are always records in a well-formed non-dependent class. 1904 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 1905 1906 // Ignore direct virtual bases. 1907 if (DirectVirtualBases.count(RT)) 1908 continue; 1909 1910 // Ignore trivial destructors. 1911 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1912 if (BaseClassDecl->hasTrivialDestructor()) 1913 continue; 1914 1915 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1916 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 1917 PartialDiagnostic(diag::err_access_dtor_vbase) 1918 << VBase->getType()); 1919 1920 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 1921 } 1922} 1923 1924void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1925 if (!CDtorDecl) 1926 return; 1927 1928 AdjustDeclIfTemplate(CDtorDecl); 1929 1930 if (CXXConstructorDecl *Constructor 1931 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1932 SetBaseOrMemberInitializers(Constructor, 0, 0, false, false); 1933} 1934 1935namespace { 1936 /// PureVirtualMethodCollector - traverses a class and its superclasses 1937 /// and determines if it has any pure virtual methods. 1938 class PureVirtualMethodCollector { 1939 ASTContext &Context; 1940 1941 public: 1942 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1943 1944 private: 1945 MethodList Methods; 1946 1947 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1948 1949 public: 1950 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1951 : Context(Ctx) { 1952 1953 MethodList List; 1954 Collect(RD, List); 1955 1956 // Copy the temporary list to methods, and make sure to ignore any 1957 // null entries. 1958 for (size_t i = 0, e = List.size(); i != e; ++i) { 1959 if (List[i]) 1960 Methods.push_back(List[i]); 1961 } 1962 } 1963 1964 bool empty() const { return Methods.empty(); } 1965 1966 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1967 MethodList::const_iterator methods_end() { return Methods.end(); } 1968 }; 1969 1970 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1971 MethodList& Methods) { 1972 // First, collect the pure virtual methods for the base classes. 1973 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1974 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1975 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1976 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1977 if (BaseDecl && BaseDecl->isAbstract()) 1978 Collect(BaseDecl, Methods); 1979 } 1980 } 1981 1982 // Next, zero out any pure virtual methods that this class overrides. 1983 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1984 1985 MethodSetTy OverriddenMethods; 1986 size_t MethodsSize = Methods.size(); 1987 1988 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1989 i != e; ++i) { 1990 // Traverse the record, looking for methods. 1991 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1992 // If the method is pure virtual, add it to the methods vector. 1993 if (MD->isPure()) 1994 Methods.push_back(MD); 1995 1996 // Record all the overridden methods in our set. 1997 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1998 E = MD->end_overridden_methods(); I != E; ++I) { 1999 // Keep track of the overridden methods. 2000 OverriddenMethods.insert(*I); 2001 } 2002 } 2003 } 2004 2005 // Now go through the methods and zero out all the ones we know are 2006 // overridden. 2007 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 2008 if (OverriddenMethods.count(Methods[i])) 2009 Methods[i] = 0; 2010 } 2011 2012 } 2013} 2014 2015 2016bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2017 unsigned DiagID, AbstractDiagSelID SelID, 2018 const CXXRecordDecl *CurrentRD) { 2019 if (SelID == -1) 2020 return RequireNonAbstractType(Loc, T, 2021 PDiag(DiagID), CurrentRD); 2022 else 2023 return RequireNonAbstractType(Loc, T, 2024 PDiag(DiagID) << SelID, CurrentRD); 2025} 2026 2027bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2028 const PartialDiagnostic &PD, 2029 const CXXRecordDecl *CurrentRD) { 2030 if (!getLangOptions().CPlusPlus) 2031 return false; 2032 2033 if (const ArrayType *AT = Context.getAsArrayType(T)) 2034 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2035 CurrentRD); 2036 2037 if (const PointerType *PT = T->getAs<PointerType>()) { 2038 // Find the innermost pointer type. 2039 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2040 PT = T; 2041 2042 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2043 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2044 } 2045 2046 const RecordType *RT = T->getAs<RecordType>(); 2047 if (!RT) 2048 return false; 2049 2050 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2051 2052 if (CurrentRD && CurrentRD != RD) 2053 return false; 2054 2055 // FIXME: is this reasonable? It matches current behavior, but.... 2056 if (!RD->getDefinition()) 2057 return false; 2058 2059 if (!RD->isAbstract()) 2060 return false; 2061 2062 Diag(Loc, PD) << RD->getDeclName(); 2063 2064 // Check if we've already emitted the list of pure virtual functions for this 2065 // class. 2066 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2067 return true; 2068 2069 PureVirtualMethodCollector Collector(Context, RD); 2070 2071 for (PureVirtualMethodCollector::MethodList::const_iterator I = 2072 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 2073 const CXXMethodDecl *MD = *I; 2074 2075 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 2076 MD->getDeclName(); 2077 } 2078 2079 if (!PureVirtualClassDiagSet) 2080 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2081 PureVirtualClassDiagSet->insert(RD); 2082 2083 return true; 2084} 2085 2086namespace { 2087 class AbstractClassUsageDiagnoser 2088 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2089 Sema &SemaRef; 2090 CXXRecordDecl *AbstractClass; 2091 2092 bool VisitDeclContext(const DeclContext *DC) { 2093 bool Invalid = false; 2094 2095 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2096 E = DC->decls_end(); I != E; ++I) 2097 Invalid |= Visit(*I); 2098 2099 return Invalid; 2100 } 2101 2102 public: 2103 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2104 : SemaRef(SemaRef), AbstractClass(ac) { 2105 Visit(SemaRef.Context.getTranslationUnitDecl()); 2106 } 2107 2108 bool VisitFunctionDecl(const FunctionDecl *FD) { 2109 if (FD->isThisDeclarationADefinition()) { 2110 // No need to do the check if we're in a definition, because it requires 2111 // that the return/param types are complete. 2112 // because that requires 2113 return VisitDeclContext(FD); 2114 } 2115 2116 // Check the return type. 2117 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2118 bool Invalid = 2119 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2120 diag::err_abstract_type_in_decl, 2121 Sema::AbstractReturnType, 2122 AbstractClass); 2123 2124 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2125 E = FD->param_end(); I != E; ++I) { 2126 const ParmVarDecl *VD = *I; 2127 Invalid |= 2128 SemaRef.RequireNonAbstractType(VD->getLocation(), 2129 VD->getOriginalType(), 2130 diag::err_abstract_type_in_decl, 2131 Sema::AbstractParamType, 2132 AbstractClass); 2133 } 2134 2135 return Invalid; 2136 } 2137 2138 bool VisitDecl(const Decl* D) { 2139 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2140 return VisitDeclContext(DC); 2141 2142 return false; 2143 } 2144 }; 2145} 2146 2147/// \brief Perform semantic checks on a class definition that has been 2148/// completing, introducing implicitly-declared members, checking for 2149/// abstract types, etc. 2150void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2151 if (!Record || Record->isInvalidDecl()) 2152 return; 2153 2154 if (!Record->isDependentType()) 2155 AddImplicitlyDeclaredMembersToClass(Record); 2156 2157 if (Record->isInvalidDecl()) 2158 return; 2159 2160 // Set access bits correctly on the directly-declared conversions. 2161 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2162 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2163 Convs->setAccess(I, (*I)->getAccess()); 2164 2165 if (!Record->isAbstract()) { 2166 // Collect all the pure virtual methods and see if this is an abstract 2167 // class after all. 2168 PureVirtualMethodCollector Collector(Context, Record); 2169 if (!Collector.empty()) 2170 Record->setAbstract(true); 2171 } 2172 2173 if (Record->isAbstract()) 2174 (void)AbstractClassUsageDiagnoser(*this, Record); 2175} 2176 2177void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2178 DeclPtrTy TagDecl, 2179 SourceLocation LBrac, 2180 SourceLocation RBrac) { 2181 if (!TagDecl) 2182 return; 2183 2184 AdjustDeclIfTemplate(TagDecl); 2185 2186 ActOnFields(S, RLoc, TagDecl, 2187 (DeclPtrTy*)FieldCollector->getCurFields(), 2188 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 2189 2190 CheckCompletedCXXClass( 2191 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2192} 2193 2194/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2195/// special functions, such as the default constructor, copy 2196/// constructor, or destructor, to the given C++ class (C++ 2197/// [special]p1). This routine can only be executed just before the 2198/// definition of the class is complete. 2199void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2200 CanQualType ClassType 2201 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2202 2203 // FIXME: Implicit declarations have exception specifications, which are 2204 // the union of the specifications of the implicitly called functions. 2205 2206 if (!ClassDecl->hasUserDeclaredConstructor()) { 2207 // C++ [class.ctor]p5: 2208 // A default constructor for a class X is a constructor of class X 2209 // that can be called without an argument. If there is no 2210 // user-declared constructor for class X, a default constructor is 2211 // implicitly declared. An implicitly-declared default constructor 2212 // is an inline public member of its class. 2213 DeclarationName Name 2214 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2215 CXXConstructorDecl *DefaultCon = 2216 CXXConstructorDecl::Create(Context, ClassDecl, 2217 ClassDecl->getLocation(), Name, 2218 Context.getFunctionType(Context.VoidTy, 2219 0, 0, false, 0, 2220 /*FIXME*/false, false, 2221 0, 0, false, 2222 CC_Default), 2223 /*TInfo=*/0, 2224 /*isExplicit=*/false, 2225 /*isInline=*/true, 2226 /*isImplicitlyDeclared=*/true); 2227 DefaultCon->setAccess(AS_public); 2228 DefaultCon->setImplicit(); 2229 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2230 ClassDecl->addDecl(DefaultCon); 2231 } 2232 2233 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2234 // C++ [class.copy]p4: 2235 // If the class definition does not explicitly declare a copy 2236 // constructor, one is declared implicitly. 2237 2238 // C++ [class.copy]p5: 2239 // The implicitly-declared copy constructor for a class X will 2240 // have the form 2241 // 2242 // X::X(const X&) 2243 // 2244 // if 2245 bool HasConstCopyConstructor = true; 2246 2247 // -- each direct or virtual base class B of X has a copy 2248 // constructor whose first parameter is of type const B& or 2249 // const volatile B&, and 2250 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2251 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2252 const CXXRecordDecl *BaseClassDecl 2253 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2254 HasConstCopyConstructor 2255 = BaseClassDecl->hasConstCopyConstructor(Context); 2256 } 2257 2258 // -- for all the nonstatic data members of X that are of a 2259 // class type M (or array thereof), each such class type 2260 // has a copy constructor whose first parameter is of type 2261 // const M& or const volatile M&. 2262 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2263 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2264 ++Field) { 2265 QualType FieldType = (*Field)->getType(); 2266 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2267 FieldType = Array->getElementType(); 2268 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2269 const CXXRecordDecl *FieldClassDecl 2270 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2271 HasConstCopyConstructor 2272 = FieldClassDecl->hasConstCopyConstructor(Context); 2273 } 2274 } 2275 2276 // Otherwise, the implicitly declared copy constructor will have 2277 // the form 2278 // 2279 // X::X(X&) 2280 QualType ArgType = ClassType; 2281 if (HasConstCopyConstructor) 2282 ArgType = ArgType.withConst(); 2283 ArgType = Context.getLValueReferenceType(ArgType); 2284 2285 // An implicitly-declared copy constructor is an inline public 2286 // member of its class. 2287 DeclarationName Name 2288 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2289 CXXConstructorDecl *CopyConstructor 2290 = CXXConstructorDecl::Create(Context, ClassDecl, 2291 ClassDecl->getLocation(), Name, 2292 Context.getFunctionType(Context.VoidTy, 2293 &ArgType, 1, 2294 false, 0, 2295 /*FIXME:*/false, 2296 false, 0, 0, false, 2297 CC_Default), 2298 /*TInfo=*/0, 2299 /*isExplicit=*/false, 2300 /*isInline=*/true, 2301 /*isImplicitlyDeclared=*/true); 2302 CopyConstructor->setAccess(AS_public); 2303 CopyConstructor->setImplicit(); 2304 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2305 2306 // Add the parameter to the constructor. 2307 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2308 ClassDecl->getLocation(), 2309 /*IdentifierInfo=*/0, 2310 ArgType, /*TInfo=*/0, 2311 VarDecl::None, 0); 2312 CopyConstructor->setParams(&FromParam, 1); 2313 ClassDecl->addDecl(CopyConstructor); 2314 } 2315 2316 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2317 // Note: The following rules are largely analoguous to the copy 2318 // constructor rules. Note that virtual bases are not taken into account 2319 // for determining the argument type of the operator. Note also that 2320 // operators taking an object instead of a reference are allowed. 2321 // 2322 // C++ [class.copy]p10: 2323 // If the class definition does not explicitly declare a copy 2324 // assignment operator, one is declared implicitly. 2325 // The implicitly-defined copy assignment operator for a class X 2326 // will have the form 2327 // 2328 // X& X::operator=(const X&) 2329 // 2330 // if 2331 bool HasConstCopyAssignment = true; 2332 2333 // -- each direct base class B of X has a copy assignment operator 2334 // whose parameter is of type const B&, const volatile B& or B, 2335 // and 2336 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2337 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2338 assert(!Base->getType()->isDependentType() && 2339 "Cannot generate implicit members for class with dependent bases."); 2340 const CXXRecordDecl *BaseClassDecl 2341 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2342 const CXXMethodDecl *MD = 0; 2343 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2344 MD); 2345 } 2346 2347 // -- for all the nonstatic data members of X that are of a class 2348 // type M (or array thereof), each such class type has a copy 2349 // assignment operator whose parameter is of type const M&, 2350 // const volatile M& or M. 2351 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2352 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2353 ++Field) { 2354 QualType FieldType = (*Field)->getType(); 2355 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2356 FieldType = Array->getElementType(); 2357 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2358 const CXXRecordDecl *FieldClassDecl 2359 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2360 const CXXMethodDecl *MD = 0; 2361 HasConstCopyAssignment 2362 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2363 } 2364 } 2365 2366 // Otherwise, the implicitly declared copy assignment operator will 2367 // have the form 2368 // 2369 // X& X::operator=(X&) 2370 QualType ArgType = ClassType; 2371 QualType RetType = Context.getLValueReferenceType(ArgType); 2372 if (HasConstCopyAssignment) 2373 ArgType = ArgType.withConst(); 2374 ArgType = Context.getLValueReferenceType(ArgType); 2375 2376 // An implicitly-declared copy assignment operator is an inline public 2377 // member of its class. 2378 DeclarationName Name = 2379 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2380 CXXMethodDecl *CopyAssignment = 2381 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2382 Context.getFunctionType(RetType, &ArgType, 1, 2383 false, 0, 2384 /*FIXME:*/false, 2385 false, 0, 0, false, 2386 CC_Default), 2387 /*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2388 CopyAssignment->setAccess(AS_public); 2389 CopyAssignment->setImplicit(); 2390 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2391 CopyAssignment->setCopyAssignment(true); 2392 2393 // Add the parameter to the operator. 2394 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2395 ClassDecl->getLocation(), 2396 /*IdentifierInfo=*/0, 2397 ArgType, /*TInfo=*/0, 2398 VarDecl::None, 0); 2399 CopyAssignment->setParams(&FromParam, 1); 2400 2401 // Don't call addedAssignmentOperator. There is no way to distinguish an 2402 // implicit from an explicit assignment operator. 2403 ClassDecl->addDecl(CopyAssignment); 2404 AddOverriddenMethods(ClassDecl, CopyAssignment); 2405 } 2406 2407 if (!ClassDecl->hasUserDeclaredDestructor()) { 2408 // C++ [class.dtor]p2: 2409 // If a class has no user-declared destructor, a destructor is 2410 // declared implicitly. An implicitly-declared destructor is an 2411 // inline public member of its class. 2412 QualType Ty = Context.getFunctionType(Context.VoidTy, 2413 0, 0, false, 0, 2414 /*FIXME:*/false, 2415 false, 0, 0, false, 2416 CC_Default); 2417 2418 DeclarationName Name 2419 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2420 CXXDestructorDecl *Destructor 2421 = CXXDestructorDecl::Create(Context, ClassDecl, 2422 ClassDecl->getLocation(), Name, Ty, 2423 /*isInline=*/true, 2424 /*isImplicitlyDeclared=*/true); 2425 Destructor->setAccess(AS_public); 2426 Destructor->setImplicit(); 2427 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2428 ClassDecl->addDecl(Destructor); 2429 2430 // This could be uniqued if it ever proves significant. 2431 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2432 2433 AddOverriddenMethods(ClassDecl, Destructor); 2434 } 2435} 2436 2437void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2438 Decl *D = TemplateD.getAs<Decl>(); 2439 if (!D) 2440 return; 2441 2442 TemplateParameterList *Params = 0; 2443 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2444 Params = Template->getTemplateParameters(); 2445 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2446 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2447 Params = PartialSpec->getTemplateParameters(); 2448 else 2449 return; 2450 2451 for (TemplateParameterList::iterator Param = Params->begin(), 2452 ParamEnd = Params->end(); 2453 Param != ParamEnd; ++Param) { 2454 NamedDecl *Named = cast<NamedDecl>(*Param); 2455 if (Named->getDeclName()) { 2456 S->AddDecl(DeclPtrTy::make(Named)); 2457 IdResolver.AddDecl(Named); 2458 } 2459 } 2460} 2461 2462void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2463 if (!RecordD) return; 2464 AdjustDeclIfTemplate(RecordD); 2465 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2466 PushDeclContext(S, Record); 2467} 2468 2469void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2470 if (!RecordD) return; 2471 PopDeclContext(); 2472} 2473 2474/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2475/// parsing a top-level (non-nested) C++ class, and we are now 2476/// parsing those parts of the given Method declaration that could 2477/// not be parsed earlier (C++ [class.mem]p2), such as default 2478/// arguments. This action should enter the scope of the given 2479/// Method declaration as if we had just parsed the qualified method 2480/// name. However, it should not bring the parameters into scope; 2481/// that will be performed by ActOnDelayedCXXMethodParameter. 2482void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2483} 2484 2485/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2486/// C++ method declaration. We're (re-)introducing the given 2487/// function parameter into scope for use in parsing later parts of 2488/// the method declaration. For example, we could see an 2489/// ActOnParamDefaultArgument event for this parameter. 2490void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2491 if (!ParamD) 2492 return; 2493 2494 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2495 2496 // If this parameter has an unparsed default argument, clear it out 2497 // to make way for the parsed default argument. 2498 if (Param->hasUnparsedDefaultArg()) 2499 Param->setDefaultArg(0); 2500 2501 S->AddDecl(DeclPtrTy::make(Param)); 2502 if (Param->getDeclName()) 2503 IdResolver.AddDecl(Param); 2504} 2505 2506/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2507/// processing the delayed method declaration for Method. The method 2508/// declaration is now considered finished. There may be a separate 2509/// ActOnStartOfFunctionDef action later (not necessarily 2510/// immediately!) for this method, if it was also defined inside the 2511/// class body. 2512void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2513 if (!MethodD) 2514 return; 2515 2516 AdjustDeclIfTemplate(MethodD); 2517 2518 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2519 2520 // Now that we have our default arguments, check the constructor 2521 // again. It could produce additional diagnostics or affect whether 2522 // the class has implicitly-declared destructors, among other 2523 // things. 2524 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2525 CheckConstructor(Constructor); 2526 2527 // Check the default arguments, which we may have added. 2528 if (!Method->isInvalidDecl()) 2529 CheckCXXDefaultArguments(Method); 2530} 2531 2532/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2533/// the well-formedness of the constructor declarator @p D with type @p 2534/// R. If there are any errors in the declarator, this routine will 2535/// emit diagnostics and set the invalid bit to true. In any case, the type 2536/// will be updated to reflect a well-formed type for the constructor and 2537/// returned. 2538QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2539 FunctionDecl::StorageClass &SC) { 2540 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2541 2542 // C++ [class.ctor]p3: 2543 // A constructor shall not be virtual (10.3) or static (9.4). A 2544 // constructor can be invoked for a const, volatile or const 2545 // volatile object. A constructor shall not be declared const, 2546 // volatile, or const volatile (9.3.2). 2547 if (isVirtual) { 2548 if (!D.isInvalidType()) 2549 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2550 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2551 << SourceRange(D.getIdentifierLoc()); 2552 D.setInvalidType(); 2553 } 2554 if (SC == FunctionDecl::Static) { 2555 if (!D.isInvalidType()) 2556 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2557 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2558 << SourceRange(D.getIdentifierLoc()); 2559 D.setInvalidType(); 2560 SC = FunctionDecl::None; 2561 } 2562 2563 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2564 if (FTI.TypeQuals != 0) { 2565 if (FTI.TypeQuals & Qualifiers::Const) 2566 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2567 << "const" << SourceRange(D.getIdentifierLoc()); 2568 if (FTI.TypeQuals & Qualifiers::Volatile) 2569 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2570 << "volatile" << SourceRange(D.getIdentifierLoc()); 2571 if (FTI.TypeQuals & Qualifiers::Restrict) 2572 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2573 << "restrict" << SourceRange(D.getIdentifierLoc()); 2574 } 2575 2576 // Rebuild the function type "R" without any type qualifiers (in 2577 // case any of the errors above fired) and with "void" as the 2578 // return type, since constructors don't have return types. We 2579 // *always* have to do this, because GetTypeForDeclarator will 2580 // put in a result type of "int" when none was specified. 2581 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2582 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2583 Proto->getNumArgs(), 2584 Proto->isVariadic(), 0, 2585 Proto->hasExceptionSpec(), 2586 Proto->hasAnyExceptionSpec(), 2587 Proto->getNumExceptions(), 2588 Proto->exception_begin(), 2589 Proto->getNoReturnAttr(), 2590 Proto->getCallConv()); 2591} 2592 2593/// CheckConstructor - Checks a fully-formed constructor for 2594/// well-formedness, issuing any diagnostics required. Returns true if 2595/// the constructor declarator is invalid. 2596void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2597 CXXRecordDecl *ClassDecl 2598 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2599 if (!ClassDecl) 2600 return Constructor->setInvalidDecl(); 2601 2602 // C++ [class.copy]p3: 2603 // A declaration of a constructor for a class X is ill-formed if 2604 // its first parameter is of type (optionally cv-qualified) X and 2605 // either there are no other parameters or else all other 2606 // parameters have default arguments. 2607 if (!Constructor->isInvalidDecl() && 2608 ((Constructor->getNumParams() == 1) || 2609 (Constructor->getNumParams() > 1 && 2610 Constructor->getParamDecl(1)->hasDefaultArg())) && 2611 Constructor->getTemplateSpecializationKind() 2612 != TSK_ImplicitInstantiation) { 2613 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2614 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2615 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2616 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2617 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2618 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 2619 2620 // FIXME: Rather that making the constructor invalid, we should endeavor 2621 // to fix the type. 2622 Constructor->setInvalidDecl(); 2623 } 2624 } 2625 2626 // Notify the class that we've added a constructor. 2627 ClassDecl->addedConstructor(Context, Constructor); 2628} 2629 2630/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2631/// issuing any diagnostics required. Returns true on error. 2632bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2633 CXXRecordDecl *RD = Destructor->getParent(); 2634 2635 if (Destructor->isVirtual()) { 2636 SourceLocation Loc; 2637 2638 if (!Destructor->isImplicit()) 2639 Loc = Destructor->getLocation(); 2640 else 2641 Loc = RD->getLocation(); 2642 2643 // If we have a virtual destructor, look up the deallocation function 2644 FunctionDecl *OperatorDelete = 0; 2645 DeclarationName Name = 2646 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2647 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2648 return true; 2649 2650 Destructor->setOperatorDelete(OperatorDelete); 2651 } 2652 2653 return false; 2654} 2655 2656static inline bool 2657FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2658 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2659 FTI.ArgInfo[0].Param && 2660 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2661} 2662 2663/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2664/// the well-formednes of the destructor declarator @p D with type @p 2665/// R. If there are any errors in the declarator, this routine will 2666/// emit diagnostics and set the declarator to invalid. Even if this happens, 2667/// will be updated to reflect a well-formed type for the destructor and 2668/// returned. 2669QualType Sema::CheckDestructorDeclarator(Declarator &D, 2670 FunctionDecl::StorageClass& SC) { 2671 // C++ [class.dtor]p1: 2672 // [...] A typedef-name that names a class is a class-name 2673 // (7.1.3); however, a typedef-name that names a class shall not 2674 // be used as the identifier in the declarator for a destructor 2675 // declaration. 2676 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2677 if (isa<TypedefType>(DeclaratorType)) { 2678 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2679 << DeclaratorType; 2680 D.setInvalidType(); 2681 } 2682 2683 // C++ [class.dtor]p2: 2684 // A destructor is used to destroy objects of its class type. A 2685 // destructor takes no parameters, and no return type can be 2686 // specified for it (not even void). The address of a destructor 2687 // shall not be taken. A destructor shall not be static. A 2688 // destructor can be invoked for a const, volatile or const 2689 // volatile object. A destructor shall not be declared const, 2690 // volatile or const volatile (9.3.2). 2691 if (SC == FunctionDecl::Static) { 2692 if (!D.isInvalidType()) 2693 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2694 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2695 << SourceRange(D.getIdentifierLoc()); 2696 SC = FunctionDecl::None; 2697 D.setInvalidType(); 2698 } 2699 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2700 // Destructors don't have return types, but the parser will 2701 // happily parse something like: 2702 // 2703 // class X { 2704 // float ~X(); 2705 // }; 2706 // 2707 // The return type will be eliminated later. 2708 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2709 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2710 << SourceRange(D.getIdentifierLoc()); 2711 } 2712 2713 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2714 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2715 if (FTI.TypeQuals & Qualifiers::Const) 2716 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2717 << "const" << SourceRange(D.getIdentifierLoc()); 2718 if (FTI.TypeQuals & Qualifiers::Volatile) 2719 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2720 << "volatile" << SourceRange(D.getIdentifierLoc()); 2721 if (FTI.TypeQuals & Qualifiers::Restrict) 2722 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2723 << "restrict" << SourceRange(D.getIdentifierLoc()); 2724 D.setInvalidType(); 2725 } 2726 2727 // Make sure we don't have any parameters. 2728 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2729 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2730 2731 // Delete the parameters. 2732 FTI.freeArgs(); 2733 D.setInvalidType(); 2734 } 2735 2736 // Make sure the destructor isn't variadic. 2737 if (FTI.isVariadic) { 2738 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2739 D.setInvalidType(); 2740 } 2741 2742 // Rebuild the function type "R" without any type qualifiers or 2743 // parameters (in case any of the errors above fired) and with 2744 // "void" as the return type, since destructors don't have return 2745 // types. We *always* have to do this, because GetTypeForDeclarator 2746 // will put in a result type of "int" when none was specified. 2747 // FIXME: Exceptions! 2748 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 2749 false, false, 0, 0, false, CC_Default); 2750} 2751 2752/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2753/// well-formednes of the conversion function declarator @p D with 2754/// type @p R. If there are any errors in the declarator, this routine 2755/// will emit diagnostics and return true. Otherwise, it will return 2756/// false. Either way, the type @p R will be updated to reflect a 2757/// well-formed type for the conversion operator. 2758void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2759 FunctionDecl::StorageClass& SC) { 2760 // C++ [class.conv.fct]p1: 2761 // Neither parameter types nor return type can be specified. The 2762 // type of a conversion function (8.3.5) is "function taking no 2763 // parameter returning conversion-type-id." 2764 if (SC == FunctionDecl::Static) { 2765 if (!D.isInvalidType()) 2766 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2767 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2768 << SourceRange(D.getIdentifierLoc()); 2769 D.setInvalidType(); 2770 SC = FunctionDecl::None; 2771 } 2772 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2773 // Conversion functions don't have return types, but the parser will 2774 // happily parse something like: 2775 // 2776 // class X { 2777 // float operator bool(); 2778 // }; 2779 // 2780 // The return type will be changed later anyway. 2781 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2782 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2783 << SourceRange(D.getIdentifierLoc()); 2784 } 2785 2786 // Make sure we don't have any parameters. 2787 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2788 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2789 2790 // Delete the parameters. 2791 D.getTypeObject(0).Fun.freeArgs(); 2792 D.setInvalidType(); 2793 } 2794 2795 // Make sure the conversion function isn't variadic. 2796 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2797 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2798 D.setInvalidType(); 2799 } 2800 2801 // C++ [class.conv.fct]p4: 2802 // The conversion-type-id shall not represent a function type nor 2803 // an array type. 2804 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2805 if (ConvType->isArrayType()) { 2806 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2807 ConvType = Context.getPointerType(ConvType); 2808 D.setInvalidType(); 2809 } else if (ConvType->isFunctionType()) { 2810 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2811 ConvType = Context.getPointerType(ConvType); 2812 D.setInvalidType(); 2813 } 2814 2815 // Rebuild the function type "R" without any parameters (in case any 2816 // of the errors above fired) and with the conversion type as the 2817 // return type. 2818 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2819 R = Context.getFunctionType(ConvType, 0, 0, false, 2820 Proto->getTypeQuals(), 2821 Proto->hasExceptionSpec(), 2822 Proto->hasAnyExceptionSpec(), 2823 Proto->getNumExceptions(), 2824 Proto->exception_begin(), 2825 Proto->getNoReturnAttr(), 2826 Proto->getCallConv()); 2827 2828 // C++0x explicit conversion operators. 2829 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2830 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2831 diag::warn_explicit_conversion_functions) 2832 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2833} 2834 2835/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2836/// the declaration of the given C++ conversion function. This routine 2837/// is responsible for recording the conversion function in the C++ 2838/// class, if possible. 2839Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2840 assert(Conversion && "Expected to receive a conversion function declaration"); 2841 2842 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2843 2844 // Make sure we aren't redeclaring the conversion function. 2845 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2846 2847 // C++ [class.conv.fct]p1: 2848 // [...] A conversion function is never used to convert a 2849 // (possibly cv-qualified) object to the (possibly cv-qualified) 2850 // same object type (or a reference to it), to a (possibly 2851 // cv-qualified) base class of that type (or a reference to it), 2852 // or to (possibly cv-qualified) void. 2853 // FIXME: Suppress this warning if the conversion function ends up being a 2854 // virtual function that overrides a virtual function in a base class. 2855 QualType ClassType 2856 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2857 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2858 ConvType = ConvTypeRef->getPointeeType(); 2859 if (ConvType->isRecordType()) { 2860 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2861 if (ConvType == ClassType) 2862 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2863 << ClassType; 2864 else if (IsDerivedFrom(ClassType, ConvType)) 2865 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2866 << ClassType << ConvType; 2867 } else if (ConvType->isVoidType()) { 2868 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2869 << ClassType << ConvType; 2870 } 2871 2872 if (Conversion->getPrimaryTemplate()) { 2873 // ignore specializations 2874 } else if (Conversion->getPreviousDeclaration()) { 2875 if (FunctionTemplateDecl *ConversionTemplate 2876 = Conversion->getDescribedFunctionTemplate()) { 2877 if (ClassDecl->replaceConversion( 2878 ConversionTemplate->getPreviousDeclaration(), 2879 ConversionTemplate)) 2880 return DeclPtrTy::make(ConversionTemplate); 2881 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 2882 Conversion)) 2883 return DeclPtrTy::make(Conversion); 2884 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2885 } else if (FunctionTemplateDecl *ConversionTemplate 2886 = Conversion->getDescribedFunctionTemplate()) 2887 ClassDecl->addConversionFunction(ConversionTemplate); 2888 else 2889 ClassDecl->addConversionFunction(Conversion); 2890 2891 return DeclPtrTy::make(Conversion); 2892} 2893 2894//===----------------------------------------------------------------------===// 2895// Namespace Handling 2896//===----------------------------------------------------------------------===// 2897 2898/// ActOnStartNamespaceDef - This is called at the start of a namespace 2899/// definition. 2900Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2901 SourceLocation IdentLoc, 2902 IdentifierInfo *II, 2903 SourceLocation LBrace, 2904 AttributeList *AttrList) { 2905 NamespaceDecl *Namespc = 2906 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2907 Namespc->setLBracLoc(LBrace); 2908 2909 Scope *DeclRegionScope = NamespcScope->getParent(); 2910 2911 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 2912 2913 if (II) { 2914 // C++ [namespace.def]p2: 2915 // The identifier in an original-namespace-definition shall not have been 2916 // previously defined in the declarative region in which the 2917 // original-namespace-definition appears. The identifier in an 2918 // original-namespace-definition is the name of the namespace. Subsequently 2919 // in that declarative region, it is treated as an original-namespace-name. 2920 2921 NamedDecl *PrevDecl 2922 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2923 ForRedeclaration); 2924 2925 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2926 // This is an extended namespace definition. 2927 // Attach this namespace decl to the chain of extended namespace 2928 // definitions. 2929 OrigNS->setNextNamespace(Namespc); 2930 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2931 2932 // Remove the previous declaration from the scope. 2933 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2934 IdResolver.RemoveDecl(OrigNS); 2935 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2936 } 2937 } else if (PrevDecl) { 2938 // This is an invalid name redefinition. 2939 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2940 << Namespc->getDeclName(); 2941 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2942 Namespc->setInvalidDecl(); 2943 // Continue on to push Namespc as current DeclContext and return it. 2944 } else if (II->isStr("std") && 2945 CurContext->getLookupContext()->isTranslationUnit()) { 2946 // This is the first "real" definition of the namespace "std", so update 2947 // our cache of the "std" namespace to point at this definition. 2948 if (StdNamespace) { 2949 // We had already defined a dummy namespace "std". Link this new 2950 // namespace definition to the dummy namespace "std". 2951 StdNamespace->setNextNamespace(Namespc); 2952 StdNamespace->setLocation(IdentLoc); 2953 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2954 } 2955 2956 // Make our StdNamespace cache point at the first real definition of the 2957 // "std" namespace. 2958 StdNamespace = Namespc; 2959 } 2960 2961 PushOnScopeChains(Namespc, DeclRegionScope); 2962 } else { 2963 // Anonymous namespaces. 2964 assert(Namespc->isAnonymousNamespace()); 2965 CurContext->addDecl(Namespc); 2966 2967 // Link the anonymous namespace into its parent. 2968 NamespaceDecl *PrevDecl; 2969 DeclContext *Parent = CurContext->getLookupContext(); 2970 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 2971 PrevDecl = TU->getAnonymousNamespace(); 2972 TU->setAnonymousNamespace(Namespc); 2973 } else { 2974 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 2975 PrevDecl = ND->getAnonymousNamespace(); 2976 ND->setAnonymousNamespace(Namespc); 2977 } 2978 2979 // Link the anonymous namespace with its previous declaration. 2980 if (PrevDecl) { 2981 assert(PrevDecl->isAnonymousNamespace()); 2982 assert(!PrevDecl->getNextNamespace()); 2983 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 2984 PrevDecl->setNextNamespace(Namespc); 2985 } 2986 2987 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2988 // behaves as if it were replaced by 2989 // namespace unique { /* empty body */ } 2990 // using namespace unique; 2991 // namespace unique { namespace-body } 2992 // where all occurrences of 'unique' in a translation unit are 2993 // replaced by the same identifier and this identifier differs 2994 // from all other identifiers in the entire program. 2995 2996 // We just create the namespace with an empty name and then add an 2997 // implicit using declaration, just like the standard suggests. 2998 // 2999 // CodeGen enforces the "universally unique" aspect by giving all 3000 // declarations semantically contained within an anonymous 3001 // namespace internal linkage. 3002 3003 if (!PrevDecl) { 3004 UsingDirectiveDecl* UD 3005 = UsingDirectiveDecl::Create(Context, CurContext, 3006 /* 'using' */ LBrace, 3007 /* 'namespace' */ SourceLocation(), 3008 /* qualifier */ SourceRange(), 3009 /* NNS */ NULL, 3010 /* identifier */ SourceLocation(), 3011 Namespc, 3012 /* Ancestor */ CurContext); 3013 UD->setImplicit(); 3014 CurContext->addDecl(UD); 3015 } 3016 } 3017 3018 // Although we could have an invalid decl (i.e. the namespace name is a 3019 // redefinition), push it as current DeclContext and try to continue parsing. 3020 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3021 // for the namespace has the declarations that showed up in that particular 3022 // namespace definition. 3023 PushDeclContext(NamespcScope, Namespc); 3024 return DeclPtrTy::make(Namespc); 3025} 3026 3027/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3028/// is a namespace alias, returns the namespace it points to. 3029static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3030 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3031 return AD->getNamespace(); 3032 return dyn_cast_or_null<NamespaceDecl>(D); 3033} 3034 3035/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3036/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3037void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3038 Decl *Dcl = D.getAs<Decl>(); 3039 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3040 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3041 Namespc->setRBracLoc(RBrace); 3042 PopDeclContext(); 3043} 3044 3045Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3046 SourceLocation UsingLoc, 3047 SourceLocation NamespcLoc, 3048 const CXXScopeSpec &SS, 3049 SourceLocation IdentLoc, 3050 IdentifierInfo *NamespcName, 3051 AttributeList *AttrList) { 3052 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3053 assert(NamespcName && "Invalid NamespcName."); 3054 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3055 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3056 3057 UsingDirectiveDecl *UDir = 0; 3058 3059 // Lookup namespace name. 3060 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3061 LookupParsedName(R, S, &SS); 3062 if (R.isAmbiguous()) 3063 return DeclPtrTy(); 3064 3065 if (!R.empty()) { 3066 NamedDecl *Named = R.getFoundDecl(); 3067 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3068 && "expected namespace decl"); 3069 // C++ [namespace.udir]p1: 3070 // A using-directive specifies that the names in the nominated 3071 // namespace can be used in the scope in which the 3072 // using-directive appears after the using-directive. During 3073 // unqualified name lookup (3.4.1), the names appear as if they 3074 // were declared in the nearest enclosing namespace which 3075 // contains both the using-directive and the nominated 3076 // namespace. [Note: in this context, "contains" means "contains 3077 // directly or indirectly". ] 3078 3079 // Find enclosing context containing both using-directive and 3080 // nominated namespace. 3081 NamespaceDecl *NS = getNamespaceDecl(Named); 3082 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3083 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3084 CommonAncestor = CommonAncestor->getParent(); 3085 3086 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3087 SS.getRange(), 3088 (NestedNameSpecifier *)SS.getScopeRep(), 3089 IdentLoc, Named, CommonAncestor); 3090 PushUsingDirective(S, UDir); 3091 } else { 3092 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3093 } 3094 3095 // FIXME: We ignore attributes for now. 3096 delete AttrList; 3097 return DeclPtrTy::make(UDir); 3098} 3099 3100void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3101 // If scope has associated entity, then using directive is at namespace 3102 // or translation unit scope. We add UsingDirectiveDecls, into 3103 // it's lookup structure. 3104 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3105 Ctx->addDecl(UDir); 3106 else 3107 // Otherwise it is block-sope. using-directives will affect lookup 3108 // only to the end of scope. 3109 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3110} 3111 3112 3113Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3114 AccessSpecifier AS, 3115 bool HasUsingKeyword, 3116 SourceLocation UsingLoc, 3117 const CXXScopeSpec &SS, 3118 UnqualifiedId &Name, 3119 AttributeList *AttrList, 3120 bool IsTypeName, 3121 SourceLocation TypenameLoc) { 3122 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3123 3124 switch (Name.getKind()) { 3125 case UnqualifiedId::IK_Identifier: 3126 case UnqualifiedId::IK_OperatorFunctionId: 3127 case UnqualifiedId::IK_LiteralOperatorId: 3128 case UnqualifiedId::IK_ConversionFunctionId: 3129 break; 3130 3131 case UnqualifiedId::IK_ConstructorName: 3132 case UnqualifiedId::IK_ConstructorTemplateId: 3133 // C++0x inherited constructors. 3134 if (getLangOptions().CPlusPlus0x) break; 3135 3136 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3137 << SS.getRange(); 3138 return DeclPtrTy(); 3139 3140 case UnqualifiedId::IK_DestructorName: 3141 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3142 << SS.getRange(); 3143 return DeclPtrTy(); 3144 3145 case UnqualifiedId::IK_TemplateId: 3146 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3147 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3148 return DeclPtrTy(); 3149 } 3150 3151 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3152 if (!TargetName) 3153 return DeclPtrTy(); 3154 3155 // Warn about using declarations. 3156 // TODO: store that the declaration was written without 'using' and 3157 // talk about access decls instead of using decls in the 3158 // diagnostics. 3159 if (!HasUsingKeyword) { 3160 UsingLoc = Name.getSourceRange().getBegin(); 3161 3162 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3163 << CodeModificationHint::CreateInsertion(SS.getRange().getBegin(), 3164 "using "); 3165 } 3166 3167 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3168 Name.getSourceRange().getBegin(), 3169 TargetName, AttrList, 3170 /* IsInstantiation */ false, 3171 IsTypeName, TypenameLoc); 3172 if (UD) 3173 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3174 3175 return DeclPtrTy::make(UD); 3176} 3177 3178/// Determines whether to create a using shadow decl for a particular 3179/// decl, given the set of decls existing prior to this using lookup. 3180bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3181 const LookupResult &Previous) { 3182 // Diagnose finding a decl which is not from a base class of the 3183 // current class. We do this now because there are cases where this 3184 // function will silently decide not to build a shadow decl, which 3185 // will pre-empt further diagnostics. 3186 // 3187 // We don't need to do this in C++0x because we do the check once on 3188 // the qualifier. 3189 // 3190 // FIXME: diagnose the following if we care enough: 3191 // struct A { int foo; }; 3192 // struct B : A { using A::foo; }; 3193 // template <class T> struct C : A {}; 3194 // template <class T> struct D : C<T> { using B::foo; } // <--- 3195 // This is invalid (during instantiation) in C++03 because B::foo 3196 // resolves to the using decl in B, which is not a base class of D<T>. 3197 // We can't diagnose it immediately because C<T> is an unknown 3198 // specialization. The UsingShadowDecl in D<T> then points directly 3199 // to A::foo, which will look well-formed when we instantiate. 3200 // The right solution is to not collapse the shadow-decl chain. 3201 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3202 DeclContext *OrigDC = Orig->getDeclContext(); 3203 3204 // Handle enums and anonymous structs. 3205 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3206 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3207 while (OrigRec->isAnonymousStructOrUnion()) 3208 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3209 3210 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3211 if (OrigDC == CurContext) { 3212 Diag(Using->getLocation(), 3213 diag::err_using_decl_nested_name_specifier_is_current_class) 3214 << Using->getNestedNameRange(); 3215 Diag(Orig->getLocation(), diag::note_using_decl_target); 3216 return true; 3217 } 3218 3219 Diag(Using->getNestedNameRange().getBegin(), 3220 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3221 << Using->getTargetNestedNameDecl() 3222 << cast<CXXRecordDecl>(CurContext) 3223 << Using->getNestedNameRange(); 3224 Diag(Orig->getLocation(), diag::note_using_decl_target); 3225 return true; 3226 } 3227 } 3228 3229 if (Previous.empty()) return false; 3230 3231 NamedDecl *Target = Orig; 3232 if (isa<UsingShadowDecl>(Target)) 3233 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3234 3235 // If the target happens to be one of the previous declarations, we 3236 // don't have a conflict. 3237 // 3238 // FIXME: but we might be increasing its access, in which case we 3239 // should redeclare it. 3240 NamedDecl *NonTag = 0, *Tag = 0; 3241 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3242 I != E; ++I) { 3243 NamedDecl *D = (*I)->getUnderlyingDecl(); 3244 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3245 return false; 3246 3247 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3248 } 3249 3250 if (Target->isFunctionOrFunctionTemplate()) { 3251 FunctionDecl *FD; 3252 if (isa<FunctionTemplateDecl>(Target)) 3253 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3254 else 3255 FD = cast<FunctionDecl>(Target); 3256 3257 NamedDecl *OldDecl = 0; 3258 switch (CheckOverload(FD, Previous, OldDecl)) { 3259 case Ovl_Overload: 3260 return false; 3261 3262 case Ovl_NonFunction: 3263 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3264 break; 3265 3266 // We found a decl with the exact signature. 3267 case Ovl_Match: 3268 if (isa<UsingShadowDecl>(OldDecl)) { 3269 // Silently ignore the possible conflict. 3270 return false; 3271 } 3272 3273 // If we're in a record, we want to hide the target, so we 3274 // return true (without a diagnostic) to tell the caller not to 3275 // build a shadow decl. 3276 if (CurContext->isRecord()) 3277 return true; 3278 3279 // If we're not in a record, this is an error. 3280 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3281 break; 3282 } 3283 3284 Diag(Target->getLocation(), diag::note_using_decl_target); 3285 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3286 return true; 3287 } 3288 3289 // Target is not a function. 3290 3291 if (isa<TagDecl>(Target)) { 3292 // No conflict between a tag and a non-tag. 3293 if (!Tag) return false; 3294 3295 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3296 Diag(Target->getLocation(), diag::note_using_decl_target); 3297 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3298 return true; 3299 } 3300 3301 // No conflict between a tag and a non-tag. 3302 if (!NonTag) return false; 3303 3304 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3305 Diag(Target->getLocation(), diag::note_using_decl_target); 3306 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3307 return true; 3308} 3309 3310/// Builds a shadow declaration corresponding to a 'using' declaration. 3311UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3312 UsingDecl *UD, 3313 NamedDecl *Orig) { 3314 3315 // If we resolved to another shadow declaration, just coalesce them. 3316 NamedDecl *Target = Orig; 3317 if (isa<UsingShadowDecl>(Target)) { 3318 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3319 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3320 } 3321 3322 UsingShadowDecl *Shadow 3323 = UsingShadowDecl::Create(Context, CurContext, 3324 UD->getLocation(), UD, Target); 3325 UD->addShadowDecl(Shadow); 3326 3327 if (S) 3328 PushOnScopeChains(Shadow, S); 3329 else 3330 CurContext->addDecl(Shadow); 3331 Shadow->setAccess(UD->getAccess()); 3332 3333 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3334 Shadow->setInvalidDecl(); 3335 3336 return Shadow; 3337} 3338 3339/// Hides a using shadow declaration. This is required by the current 3340/// using-decl implementation when a resolvable using declaration in a 3341/// class is followed by a declaration which would hide or override 3342/// one or more of the using decl's targets; for example: 3343/// 3344/// struct Base { void foo(int); }; 3345/// struct Derived : Base { 3346/// using Base::foo; 3347/// void foo(int); 3348/// }; 3349/// 3350/// The governing language is C++03 [namespace.udecl]p12: 3351/// 3352/// When a using-declaration brings names from a base class into a 3353/// derived class scope, member functions in the derived class 3354/// override and/or hide member functions with the same name and 3355/// parameter types in a base class (rather than conflicting). 3356/// 3357/// There are two ways to implement this: 3358/// (1) optimistically create shadow decls when they're not hidden 3359/// by existing declarations, or 3360/// (2) don't create any shadow decls (or at least don't make them 3361/// visible) until we've fully parsed/instantiated the class. 3362/// The problem with (1) is that we might have to retroactively remove 3363/// a shadow decl, which requires several O(n) operations because the 3364/// decl structures are (very reasonably) not designed for removal. 3365/// (2) avoids this but is very fiddly and phase-dependent. 3366void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3367 // Remove it from the DeclContext... 3368 Shadow->getDeclContext()->removeDecl(Shadow); 3369 3370 // ...and the scope, if applicable... 3371 if (S) { 3372 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3373 IdResolver.RemoveDecl(Shadow); 3374 } 3375 3376 // ...and the using decl. 3377 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3378 3379 // TODO: complain somehow if Shadow was used. It shouldn't 3380 // be possible for this to happen, because 3381} 3382 3383/// Builds a using declaration. 3384/// 3385/// \param IsInstantiation - Whether this call arises from an 3386/// instantiation of an unresolved using declaration. We treat 3387/// the lookup differently for these declarations. 3388NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3389 SourceLocation UsingLoc, 3390 const CXXScopeSpec &SS, 3391 SourceLocation IdentLoc, 3392 DeclarationName Name, 3393 AttributeList *AttrList, 3394 bool IsInstantiation, 3395 bool IsTypeName, 3396 SourceLocation TypenameLoc) { 3397 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3398 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3399 3400 // FIXME: We ignore attributes for now. 3401 delete AttrList; 3402 3403 if (SS.isEmpty()) { 3404 Diag(IdentLoc, diag::err_using_requires_qualname); 3405 return 0; 3406 } 3407 3408 // Do the redeclaration lookup in the current scope. 3409 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3410 ForRedeclaration); 3411 Previous.setHideTags(false); 3412 if (S) { 3413 LookupName(Previous, S); 3414 3415 // It is really dumb that we have to do this. 3416 LookupResult::Filter F = Previous.makeFilter(); 3417 while (F.hasNext()) { 3418 NamedDecl *D = F.next(); 3419 if (!isDeclInScope(D, CurContext, S)) 3420 F.erase(); 3421 } 3422 F.done(); 3423 } else { 3424 assert(IsInstantiation && "no scope in non-instantiation"); 3425 assert(CurContext->isRecord() && "scope not record in instantiation"); 3426 LookupQualifiedName(Previous, CurContext); 3427 } 3428 3429 NestedNameSpecifier *NNS = 3430 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3431 3432 // Check for invalid redeclarations. 3433 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3434 return 0; 3435 3436 // Check for bad qualifiers. 3437 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3438 return 0; 3439 3440 DeclContext *LookupContext = computeDeclContext(SS); 3441 NamedDecl *D; 3442 if (!LookupContext) { 3443 if (IsTypeName) { 3444 // FIXME: not all declaration name kinds are legal here 3445 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3446 UsingLoc, TypenameLoc, 3447 SS.getRange(), NNS, 3448 IdentLoc, Name); 3449 } else { 3450 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3451 UsingLoc, SS.getRange(), NNS, 3452 IdentLoc, Name); 3453 } 3454 } else { 3455 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3456 SS.getRange(), UsingLoc, NNS, Name, 3457 IsTypeName); 3458 } 3459 D->setAccess(AS); 3460 CurContext->addDecl(D); 3461 3462 if (!LookupContext) return D; 3463 UsingDecl *UD = cast<UsingDecl>(D); 3464 3465 if (RequireCompleteDeclContext(SS)) { 3466 UD->setInvalidDecl(); 3467 return UD; 3468 } 3469 3470 // Look up the target name. 3471 3472 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3473 3474 // Unlike most lookups, we don't always want to hide tag 3475 // declarations: tag names are visible through the using declaration 3476 // even if hidden by ordinary names, *except* in a dependent context 3477 // where it's important for the sanity of two-phase lookup. 3478 if (!IsInstantiation) 3479 R.setHideTags(false); 3480 3481 LookupQualifiedName(R, LookupContext); 3482 3483 if (R.empty()) { 3484 Diag(IdentLoc, diag::err_no_member) 3485 << Name << LookupContext << SS.getRange(); 3486 UD->setInvalidDecl(); 3487 return UD; 3488 } 3489 3490 if (R.isAmbiguous()) { 3491 UD->setInvalidDecl(); 3492 return UD; 3493 } 3494 3495 if (IsTypeName) { 3496 // If we asked for a typename and got a non-type decl, error out. 3497 if (!R.getAsSingle<TypeDecl>()) { 3498 Diag(IdentLoc, diag::err_using_typename_non_type); 3499 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3500 Diag((*I)->getUnderlyingDecl()->getLocation(), 3501 diag::note_using_decl_target); 3502 UD->setInvalidDecl(); 3503 return UD; 3504 } 3505 } else { 3506 // If we asked for a non-typename and we got a type, error out, 3507 // but only if this is an instantiation of an unresolved using 3508 // decl. Otherwise just silently find the type name. 3509 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3510 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3511 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3512 UD->setInvalidDecl(); 3513 return UD; 3514 } 3515 } 3516 3517 // C++0x N2914 [namespace.udecl]p6: 3518 // A using-declaration shall not name a namespace. 3519 if (R.getAsSingle<NamespaceDecl>()) { 3520 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3521 << SS.getRange(); 3522 UD->setInvalidDecl(); 3523 return UD; 3524 } 3525 3526 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3527 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3528 BuildUsingShadowDecl(S, UD, *I); 3529 } 3530 3531 return UD; 3532} 3533 3534/// Checks that the given using declaration is not an invalid 3535/// redeclaration. Note that this is checking only for the using decl 3536/// itself, not for any ill-formedness among the UsingShadowDecls. 3537bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3538 bool isTypeName, 3539 const CXXScopeSpec &SS, 3540 SourceLocation NameLoc, 3541 const LookupResult &Prev) { 3542 // C++03 [namespace.udecl]p8: 3543 // C++0x [namespace.udecl]p10: 3544 // A using-declaration is a declaration and can therefore be used 3545 // repeatedly where (and only where) multiple declarations are 3546 // allowed. 3547 // That's only in file contexts. 3548 if (CurContext->getLookupContext()->isFileContext()) 3549 return false; 3550 3551 NestedNameSpecifier *Qual 3552 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3553 3554 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3555 NamedDecl *D = *I; 3556 3557 bool DTypename; 3558 NestedNameSpecifier *DQual; 3559 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3560 DTypename = UD->isTypeName(); 3561 DQual = UD->getTargetNestedNameDecl(); 3562 } else if (UnresolvedUsingValueDecl *UD 3563 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3564 DTypename = false; 3565 DQual = UD->getTargetNestedNameSpecifier(); 3566 } else if (UnresolvedUsingTypenameDecl *UD 3567 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3568 DTypename = true; 3569 DQual = UD->getTargetNestedNameSpecifier(); 3570 } else continue; 3571 3572 // using decls differ if one says 'typename' and the other doesn't. 3573 // FIXME: non-dependent using decls? 3574 if (isTypeName != DTypename) continue; 3575 3576 // using decls differ if they name different scopes (but note that 3577 // template instantiation can cause this check to trigger when it 3578 // didn't before instantiation). 3579 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3580 Context.getCanonicalNestedNameSpecifier(DQual)) 3581 continue; 3582 3583 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3584 Diag(D->getLocation(), diag::note_using_decl) << 1; 3585 return true; 3586 } 3587 3588 return false; 3589} 3590 3591 3592/// Checks that the given nested-name qualifier used in a using decl 3593/// in the current context is appropriately related to the current 3594/// scope. If an error is found, diagnoses it and returns true. 3595bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3596 const CXXScopeSpec &SS, 3597 SourceLocation NameLoc) { 3598 DeclContext *NamedContext = computeDeclContext(SS); 3599 3600 if (!CurContext->isRecord()) { 3601 // C++03 [namespace.udecl]p3: 3602 // C++0x [namespace.udecl]p8: 3603 // A using-declaration for a class member shall be a member-declaration. 3604 3605 // If we weren't able to compute a valid scope, it must be a 3606 // dependent class scope. 3607 if (!NamedContext || NamedContext->isRecord()) { 3608 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3609 << SS.getRange(); 3610 return true; 3611 } 3612 3613 // Otherwise, everything is known to be fine. 3614 return false; 3615 } 3616 3617 // The current scope is a record. 3618 3619 // If the named context is dependent, we can't decide much. 3620 if (!NamedContext) { 3621 // FIXME: in C++0x, we can diagnose if we can prove that the 3622 // nested-name-specifier does not refer to a base class, which is 3623 // still possible in some cases. 3624 3625 // Otherwise we have to conservatively report that things might be 3626 // okay. 3627 return false; 3628 } 3629 3630 if (!NamedContext->isRecord()) { 3631 // Ideally this would point at the last name in the specifier, 3632 // but we don't have that level of source info. 3633 Diag(SS.getRange().getBegin(), 3634 diag::err_using_decl_nested_name_specifier_is_not_class) 3635 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3636 return true; 3637 } 3638 3639 if (getLangOptions().CPlusPlus0x) { 3640 // C++0x [namespace.udecl]p3: 3641 // In a using-declaration used as a member-declaration, the 3642 // nested-name-specifier shall name a base class of the class 3643 // being defined. 3644 3645 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3646 cast<CXXRecordDecl>(NamedContext))) { 3647 if (CurContext == NamedContext) { 3648 Diag(NameLoc, 3649 diag::err_using_decl_nested_name_specifier_is_current_class) 3650 << SS.getRange(); 3651 return true; 3652 } 3653 3654 Diag(SS.getRange().getBegin(), 3655 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3656 << (NestedNameSpecifier*) SS.getScopeRep() 3657 << cast<CXXRecordDecl>(CurContext) 3658 << SS.getRange(); 3659 return true; 3660 } 3661 3662 return false; 3663 } 3664 3665 // C++03 [namespace.udecl]p4: 3666 // A using-declaration used as a member-declaration shall refer 3667 // to a member of a base class of the class being defined [etc.]. 3668 3669 // Salient point: SS doesn't have to name a base class as long as 3670 // lookup only finds members from base classes. Therefore we can 3671 // diagnose here only if we can prove that that can't happen, 3672 // i.e. if the class hierarchies provably don't intersect. 3673 3674 // TODO: it would be nice if "definitely valid" results were cached 3675 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3676 // need to be repeated. 3677 3678 struct UserData { 3679 llvm::DenseSet<const CXXRecordDecl*> Bases; 3680 3681 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3682 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3683 Data->Bases.insert(Base); 3684 return true; 3685 } 3686 3687 bool hasDependentBases(const CXXRecordDecl *Class) { 3688 return !Class->forallBases(collect, this); 3689 } 3690 3691 /// Returns true if the base is dependent or is one of the 3692 /// accumulated base classes. 3693 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3694 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3695 return !Data->Bases.count(Base); 3696 } 3697 3698 bool mightShareBases(const CXXRecordDecl *Class) { 3699 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3700 } 3701 }; 3702 3703 UserData Data; 3704 3705 // Returns false if we find a dependent base. 3706 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3707 return false; 3708 3709 // Returns false if the class has a dependent base or if it or one 3710 // of its bases is present in the base set of the current context. 3711 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3712 return false; 3713 3714 Diag(SS.getRange().getBegin(), 3715 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3716 << (NestedNameSpecifier*) SS.getScopeRep() 3717 << cast<CXXRecordDecl>(CurContext) 3718 << SS.getRange(); 3719 3720 return true; 3721} 3722 3723Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3724 SourceLocation NamespaceLoc, 3725 SourceLocation AliasLoc, 3726 IdentifierInfo *Alias, 3727 const CXXScopeSpec &SS, 3728 SourceLocation IdentLoc, 3729 IdentifierInfo *Ident) { 3730 3731 // Lookup the namespace name. 3732 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3733 LookupParsedName(R, S, &SS); 3734 3735 // Check if we have a previous declaration with the same name. 3736 if (NamedDecl *PrevDecl 3737 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3738 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3739 // We already have an alias with the same name that points to the same 3740 // namespace, so don't create a new one. 3741 if (!R.isAmbiguous() && !R.empty() && 3742 AD->getNamespace() == getNamespaceDecl(R.getFoundDecl())) 3743 return DeclPtrTy(); 3744 } 3745 3746 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3747 diag::err_redefinition_different_kind; 3748 Diag(AliasLoc, DiagID) << Alias; 3749 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3750 return DeclPtrTy(); 3751 } 3752 3753 if (R.isAmbiguous()) 3754 return DeclPtrTy(); 3755 3756 if (R.empty()) { 3757 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3758 return DeclPtrTy(); 3759 } 3760 3761 NamespaceAliasDecl *AliasDecl = 3762 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3763 Alias, SS.getRange(), 3764 (NestedNameSpecifier *)SS.getScopeRep(), 3765 IdentLoc, R.getFoundDecl()); 3766 3767 PushOnScopeChains(AliasDecl, S); 3768 return DeclPtrTy::make(AliasDecl); 3769} 3770 3771void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3772 CXXConstructorDecl *Constructor) { 3773 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3774 !Constructor->isUsed()) && 3775 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3776 3777 CXXRecordDecl *ClassDecl 3778 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3779 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3780 3781 DeclContext *PreviousContext = CurContext; 3782 CurContext = Constructor; 3783 if (SetBaseOrMemberInitializers(Constructor, 0, 0, true, false)) { 3784 Diag(CurrentLocation, diag::note_member_synthesized_at) 3785 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 3786 Constructor->setInvalidDecl(); 3787 } else { 3788 Constructor->setUsed(); 3789 } 3790 CurContext = PreviousContext; 3791} 3792 3793void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3794 CXXDestructorDecl *Destructor) { 3795 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3796 "DefineImplicitDestructor - call it for implicit default dtor"); 3797 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3798 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3799 3800 DeclContext *PreviousContext = CurContext; 3801 CurContext = Destructor; 3802 3803 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 3804 Destructor->getParent()); 3805 3806 // FIXME: If CheckDestructor fails, we should emit a note about where the 3807 // implicit destructor was needed. 3808 if (CheckDestructor(Destructor)) { 3809 Diag(CurrentLocation, diag::note_member_synthesized_at) 3810 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3811 3812 Destructor->setInvalidDecl(); 3813 CurContext = PreviousContext; 3814 3815 return; 3816 } 3817 CurContext = PreviousContext; 3818 3819 Destructor->setUsed(); 3820} 3821 3822void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3823 CXXMethodDecl *MethodDecl) { 3824 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3825 MethodDecl->getOverloadedOperator() == OO_Equal && 3826 !MethodDecl->isUsed()) && 3827 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3828 3829 CXXRecordDecl *ClassDecl 3830 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3831 3832 DeclContext *PreviousContext = CurContext; 3833 CurContext = MethodDecl; 3834 3835 // C++[class.copy] p12 3836 // Before the implicitly-declared copy assignment operator for a class is 3837 // implicitly defined, all implicitly-declared copy assignment operators 3838 // for its direct base classes and its nonstatic data members shall have 3839 // been implicitly defined. 3840 bool err = false; 3841 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3842 E = ClassDecl->bases_end(); Base != E; ++Base) { 3843 CXXRecordDecl *BaseClassDecl 3844 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3845 if (CXXMethodDecl *BaseAssignOpMethod = 3846 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3847 BaseClassDecl)) { 3848 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 3849 BaseAssignOpMethod, 3850 PartialDiagnostic(diag::err_access_assign_base) 3851 << Base->getType()); 3852 3853 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3854 } 3855 } 3856 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3857 E = ClassDecl->field_end(); Field != E; ++Field) { 3858 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3859 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3860 FieldType = Array->getElementType(); 3861 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3862 CXXRecordDecl *FieldClassDecl 3863 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3864 if (CXXMethodDecl *FieldAssignOpMethod = 3865 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3866 FieldClassDecl)) { 3867 CheckDirectMemberAccess(Field->getLocation(), 3868 FieldAssignOpMethod, 3869 PartialDiagnostic(diag::err_access_assign_field) 3870 << Field->getDeclName() << Field->getType()); 3871 3872 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3873 } 3874 } else if (FieldType->isReferenceType()) { 3875 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3876 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3877 Diag(Field->getLocation(), diag::note_declared_at); 3878 Diag(CurrentLocation, diag::note_first_required_here); 3879 err = true; 3880 } else if (FieldType.isConstQualified()) { 3881 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3882 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3883 Diag(Field->getLocation(), diag::note_declared_at); 3884 Diag(CurrentLocation, diag::note_first_required_here); 3885 err = true; 3886 } 3887 } 3888 if (!err) 3889 MethodDecl->setUsed(); 3890 3891 CurContext = PreviousContext; 3892} 3893 3894CXXMethodDecl * 3895Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 3896 ParmVarDecl *ParmDecl, 3897 CXXRecordDecl *ClassDecl) { 3898 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3899 QualType RHSType(LHSType); 3900 // If class's assignment operator argument is const/volatile qualified, 3901 // look for operator = (const/volatile B&). Otherwise, look for 3902 // operator = (B&). 3903 RHSType = Context.getCVRQualifiedType(RHSType, 3904 ParmDecl->getType().getCVRQualifiers()); 3905 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3906 LHSType, 3907 SourceLocation())); 3908 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3909 RHSType, 3910 CurrentLocation)); 3911 Expr *Args[2] = { &*LHS, &*RHS }; 3912 OverloadCandidateSet CandidateSet(CurrentLocation); 3913 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3914 CandidateSet); 3915 OverloadCandidateSet::iterator Best; 3916 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 3917 return cast<CXXMethodDecl>(Best->Function); 3918 assert(false && 3919 "getAssignOperatorMethod - copy assignment operator method not found"); 3920 return 0; 3921} 3922 3923void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3924 CXXConstructorDecl *CopyConstructor, 3925 unsigned TypeQuals) { 3926 assert((CopyConstructor->isImplicit() && 3927 CopyConstructor->isCopyConstructor(TypeQuals) && 3928 !CopyConstructor->isUsed()) && 3929 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3930 3931 CXXRecordDecl *ClassDecl 3932 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3933 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3934 3935 DeclContext *PreviousContext = CurContext; 3936 CurContext = CopyConstructor; 3937 3938 // C++ [class.copy] p209 3939 // Before the implicitly-declared copy constructor for a class is 3940 // implicitly defined, all the implicitly-declared copy constructors 3941 // for its base class and its non-static data members shall have been 3942 // implicitly defined. 3943 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3944 Base != ClassDecl->bases_end(); ++Base) { 3945 CXXRecordDecl *BaseClassDecl 3946 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3947 if (CXXConstructorDecl *BaseCopyCtor = 3948 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) { 3949 CheckDirectMemberAccess(Base->getSourceRange().getBegin(), 3950 BaseCopyCtor, 3951 PartialDiagnostic(diag::err_access_copy_base) 3952 << Base->getType()); 3953 3954 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3955 } 3956 } 3957 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3958 FieldEnd = ClassDecl->field_end(); 3959 Field != FieldEnd; ++Field) { 3960 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3961 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3962 FieldType = Array->getElementType(); 3963 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3964 CXXRecordDecl *FieldClassDecl 3965 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3966 if (CXXConstructorDecl *FieldCopyCtor = 3967 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) { 3968 CheckDirectMemberAccess(Field->getLocation(), 3969 FieldCopyCtor, 3970 PartialDiagnostic(diag::err_access_copy_field) 3971 << Field->getDeclName() << Field->getType()); 3972 3973 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3974 } 3975 } 3976 } 3977 CopyConstructor->setUsed(); 3978 3979 CurContext = PreviousContext; 3980} 3981 3982Sema::OwningExprResult 3983Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3984 CXXConstructorDecl *Constructor, 3985 MultiExprArg ExprArgs, 3986 bool RequiresZeroInit, 3987 bool BaseInitialization) { 3988 bool Elidable = false; 3989 3990 // C++ [class.copy]p15: 3991 // Whenever a temporary class object is copied using a copy constructor, and 3992 // this object and the copy have the same cv-unqualified type, an 3993 // implementation is permitted to treat the original and the copy as two 3994 // different ways of referring to the same object and not perform a copy at 3995 // all, even if the class copy constructor or destructor have side effects. 3996 3997 // FIXME: Is this enough? 3998 if (Constructor->isCopyConstructor()) { 3999 Expr *E = ((Expr **)ExprArgs.get())[0]; 4000 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 4001 if (ICE->getCastKind() == CastExpr::CK_NoOp) 4002 E = ICE->getSubExpr(); 4003 if (CXXFunctionalCastExpr *FCE = dyn_cast<CXXFunctionalCastExpr>(E)) 4004 E = FCE->getSubExpr(); 4005 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 4006 E = BE->getSubExpr(); 4007 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 4008 if (ICE->getCastKind() == CastExpr::CK_NoOp) 4009 E = ICE->getSubExpr(); 4010 4011 if (CallExpr *CE = dyn_cast<CallExpr>(E)) 4012 Elidable = !CE->getCallReturnType()->isReferenceType(); 4013 else if (isa<CXXTemporaryObjectExpr>(E)) 4014 Elidable = true; 4015 else if (isa<CXXConstructExpr>(E)) 4016 Elidable = true; 4017 } 4018 4019 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4020 Elidable, move(ExprArgs), RequiresZeroInit, 4021 BaseInitialization); 4022} 4023 4024/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4025/// including handling of its default argument expressions. 4026Sema::OwningExprResult 4027Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4028 CXXConstructorDecl *Constructor, bool Elidable, 4029 MultiExprArg ExprArgs, 4030 bool RequiresZeroInit, 4031 bool BaseInitialization) { 4032 unsigned NumExprs = ExprArgs.size(); 4033 Expr **Exprs = (Expr **)ExprArgs.release(); 4034 4035 MarkDeclarationReferenced(ConstructLoc, Constructor); 4036 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4037 Constructor, Elidable, Exprs, NumExprs, 4038 RequiresZeroInit, BaseInitialization)); 4039} 4040 4041bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4042 CXXConstructorDecl *Constructor, 4043 MultiExprArg Exprs) { 4044 OwningExprResult TempResult = 4045 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4046 move(Exprs)); 4047 if (TempResult.isInvalid()) 4048 return true; 4049 4050 Expr *Temp = TempResult.takeAs<Expr>(); 4051 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4052 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4053 VD->setInit(Temp); 4054 4055 return false; 4056} 4057 4058void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4059 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4060 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4061 !ClassDecl->hasTrivialDestructor()) { 4062 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4063 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4064 CheckDestructorAccess(VD->getLocation(), Destructor, 4065 PartialDiagnostic(diag::err_access_dtor_var) 4066 << VD->getDeclName() 4067 << VD->getType()); 4068 } 4069} 4070 4071/// AddCXXDirectInitializerToDecl - This action is called immediately after 4072/// ActOnDeclarator, when a C++ direct initializer is present. 4073/// e.g: "int x(1);" 4074void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4075 SourceLocation LParenLoc, 4076 MultiExprArg Exprs, 4077 SourceLocation *CommaLocs, 4078 SourceLocation RParenLoc) { 4079 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4080 Decl *RealDecl = Dcl.getAs<Decl>(); 4081 4082 // If there is no declaration, there was an error parsing it. Just ignore 4083 // the initializer. 4084 if (RealDecl == 0) 4085 return; 4086 4087 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4088 if (!VDecl) { 4089 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4090 RealDecl->setInvalidDecl(); 4091 return; 4092 } 4093 4094 // We will represent direct-initialization similarly to copy-initialization: 4095 // int x(1); -as-> int x = 1; 4096 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4097 // 4098 // Clients that want to distinguish between the two forms, can check for 4099 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4100 // A major benefit is that clients that don't particularly care about which 4101 // exactly form was it (like the CodeGen) can handle both cases without 4102 // special case code. 4103 4104 // C++ 8.5p11: 4105 // The form of initialization (using parentheses or '=') is generally 4106 // insignificant, but does matter when the entity being initialized has a 4107 // class type. 4108 QualType DeclInitType = VDecl->getType(); 4109 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4110 DeclInitType = Context.getBaseElementType(Array); 4111 4112 if (!VDecl->getType()->isDependentType() && 4113 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4114 diag::err_typecheck_decl_incomplete_type)) { 4115 VDecl->setInvalidDecl(); 4116 return; 4117 } 4118 4119 // The variable can not have an abstract class type. 4120 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4121 diag::err_abstract_type_in_decl, 4122 AbstractVariableType)) 4123 VDecl->setInvalidDecl(); 4124 4125 const VarDecl *Def; 4126 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4127 Diag(VDecl->getLocation(), diag::err_redefinition) 4128 << VDecl->getDeclName(); 4129 Diag(Def->getLocation(), diag::note_previous_definition); 4130 VDecl->setInvalidDecl(); 4131 return; 4132 } 4133 4134 // If either the declaration has a dependent type or if any of the 4135 // expressions is type-dependent, we represent the initialization 4136 // via a ParenListExpr for later use during template instantiation. 4137 if (VDecl->getType()->isDependentType() || 4138 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4139 // Let clients know that initialization was done with a direct initializer. 4140 VDecl->setCXXDirectInitializer(true); 4141 4142 // Store the initialization expressions as a ParenListExpr. 4143 unsigned NumExprs = Exprs.size(); 4144 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4145 (Expr **)Exprs.release(), 4146 NumExprs, RParenLoc)); 4147 return; 4148 } 4149 4150 // Capture the variable that is being initialized and the style of 4151 // initialization. 4152 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4153 4154 // FIXME: Poor source location information. 4155 InitializationKind Kind 4156 = InitializationKind::CreateDirect(VDecl->getLocation(), 4157 LParenLoc, RParenLoc); 4158 4159 InitializationSequence InitSeq(*this, Entity, Kind, 4160 (Expr**)Exprs.get(), Exprs.size()); 4161 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4162 if (Result.isInvalid()) { 4163 VDecl->setInvalidDecl(); 4164 return; 4165 } 4166 4167 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4168 VDecl->setInit(Result.takeAs<Expr>()); 4169 VDecl->setCXXDirectInitializer(true); 4170 4171 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4172 FinalizeVarWithDestructor(VDecl, Record); 4173} 4174 4175/// \brief Add the applicable constructor candidates for an initialization 4176/// by constructor. 4177static void AddConstructorInitializationCandidates(Sema &SemaRef, 4178 QualType ClassType, 4179 Expr **Args, 4180 unsigned NumArgs, 4181 InitializationKind Kind, 4182 OverloadCandidateSet &CandidateSet) { 4183 // C++ [dcl.init]p14: 4184 // If the initialization is direct-initialization, or if it is 4185 // copy-initialization where the cv-unqualified version of the 4186 // source type is the same class as, or a derived class of, the 4187 // class of the destination, constructors are considered. The 4188 // applicable constructors are enumerated (13.3.1.3), and the 4189 // best one is chosen through overload resolution (13.3). The 4190 // constructor so selected is called to initialize the object, 4191 // with the initializer expression(s) as its argument(s). If no 4192 // constructor applies, or the overload resolution is ambiguous, 4193 // the initialization is ill-formed. 4194 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 4195 assert(ClassRec && "Can only initialize a class type here"); 4196 4197 // FIXME: When we decide not to synthesize the implicitly-declared 4198 // constructors, we'll need to make them appear here. 4199 4200 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 4201 DeclarationName ConstructorName 4202 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 4203 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 4204 DeclContext::lookup_const_iterator Con, ConEnd; 4205 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 4206 Con != ConEnd; ++Con) { 4207 DeclAccessPair FoundDecl = DeclAccessPair::make(*Con, (*Con)->getAccess()); 4208 4209 // Find the constructor (which may be a template). 4210 CXXConstructorDecl *Constructor = 0; 4211 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 4212 if (ConstructorTmpl) 4213 Constructor 4214 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 4215 else 4216 Constructor = cast<CXXConstructorDecl>(*Con); 4217 4218 if ((Kind.getKind() == InitializationKind::IK_Direct) || 4219 (Kind.getKind() == InitializationKind::IK_Value) || 4220 (Kind.getKind() == InitializationKind::IK_Copy && 4221 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 4222 ((Kind.getKind() == InitializationKind::IK_Default) && 4223 Constructor->isDefaultConstructor())) { 4224 if (ConstructorTmpl) 4225 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, FoundDecl, 4226 /*ExplicitArgs*/ 0, 4227 Args, NumArgs, CandidateSet); 4228 else 4229 SemaRef.AddOverloadCandidate(Constructor, FoundDecl, 4230 Args, NumArgs, CandidateSet); 4231 } 4232 } 4233} 4234 4235/// \brief Attempt to perform initialization by constructor 4236/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 4237/// copy-initialization. 4238/// 4239/// This routine determines whether initialization by constructor is possible, 4240/// but it does not emit any diagnostics in the case where the initialization 4241/// is ill-formed. 4242/// 4243/// \param ClassType the type of the object being initialized, which must have 4244/// class type. 4245/// 4246/// \param Args the arguments provided to initialize the object 4247/// 4248/// \param NumArgs the number of arguments provided to initialize the object 4249/// 4250/// \param Kind the type of initialization being performed 4251/// 4252/// \returns the constructor used to initialize the object, if successful. 4253/// Otherwise, emits a diagnostic and returns NULL. 4254CXXConstructorDecl * 4255Sema::TryInitializationByConstructor(QualType ClassType, 4256 Expr **Args, unsigned NumArgs, 4257 SourceLocation Loc, 4258 InitializationKind Kind) { 4259 // Build the overload candidate set 4260 OverloadCandidateSet CandidateSet(Loc); 4261 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4262 CandidateSet); 4263 4264 // Determine whether we found a constructor we can use. 4265 OverloadCandidateSet::iterator Best; 4266 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4267 case OR_Success: 4268 case OR_Deleted: 4269 // We found a constructor. Return it. 4270 return cast<CXXConstructorDecl>(Best->Function); 4271 4272 case OR_No_Viable_Function: 4273 case OR_Ambiguous: 4274 // Overload resolution failed. Return nothing. 4275 return 0; 4276 } 4277 4278 // Silence GCC warning 4279 return 0; 4280} 4281 4282/// \brief Given a constructor and the set of arguments provided for the 4283/// constructor, convert the arguments and add any required default arguments 4284/// to form a proper call to this constructor. 4285/// 4286/// \returns true if an error occurred, false otherwise. 4287bool 4288Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4289 MultiExprArg ArgsPtr, 4290 SourceLocation Loc, 4291 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4292 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4293 unsigned NumArgs = ArgsPtr.size(); 4294 Expr **Args = (Expr **)ArgsPtr.get(); 4295 4296 const FunctionProtoType *Proto 4297 = Constructor->getType()->getAs<FunctionProtoType>(); 4298 assert(Proto && "Constructor without a prototype?"); 4299 unsigned NumArgsInProto = Proto->getNumArgs(); 4300 4301 // If too few arguments are available, we'll fill in the rest with defaults. 4302 if (NumArgs < NumArgsInProto) 4303 ConvertedArgs.reserve(NumArgsInProto); 4304 else 4305 ConvertedArgs.reserve(NumArgs); 4306 4307 VariadicCallType CallType = 4308 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4309 llvm::SmallVector<Expr *, 8> AllArgs; 4310 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4311 Proto, 0, Args, NumArgs, AllArgs, 4312 CallType); 4313 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4314 ConvertedArgs.push_back(AllArgs[i]); 4315 return Invalid; 4316} 4317 4318/// CompareReferenceRelationship - Compare the two types T1 and T2 to 4319/// determine whether they are reference-related, 4320/// reference-compatible, reference-compatible with added 4321/// qualification, or incompatible, for use in C++ initialization by 4322/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 4323/// type, and the first type (T1) is the pointee type of the reference 4324/// type being initialized. 4325Sema::ReferenceCompareResult 4326Sema::CompareReferenceRelationship(SourceLocation Loc, 4327 QualType OrigT1, QualType OrigT2, 4328 bool& DerivedToBase) { 4329 assert(!OrigT1->isReferenceType() && 4330 "T1 must be the pointee type of the reference type"); 4331 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 4332 4333 QualType T1 = Context.getCanonicalType(OrigT1); 4334 QualType T2 = Context.getCanonicalType(OrigT2); 4335 Qualifiers T1Quals, T2Quals; 4336 QualType UnqualT1 = Context.getUnqualifiedArrayType(T1, T1Quals); 4337 QualType UnqualT2 = Context.getUnqualifiedArrayType(T2, T2Quals); 4338 4339 // C++ [dcl.init.ref]p4: 4340 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 4341 // reference-related to "cv2 T2" if T1 is the same type as T2, or 4342 // T1 is a base class of T2. 4343 if (UnqualT1 == UnqualT2) 4344 DerivedToBase = false; 4345 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 4346 !RequireCompleteType(Loc, OrigT2, PDiag()) && 4347 IsDerivedFrom(UnqualT2, UnqualT1)) 4348 DerivedToBase = true; 4349 else 4350 return Ref_Incompatible; 4351 4352 // At this point, we know that T1 and T2 are reference-related (at 4353 // least). 4354 4355 // If the type is an array type, promote the element qualifiers to the type 4356 // for comparison. 4357 if (isa<ArrayType>(T1) && T1Quals) 4358 T1 = Context.getQualifiedType(UnqualT1, T1Quals); 4359 if (isa<ArrayType>(T2) && T2Quals) 4360 T2 = Context.getQualifiedType(UnqualT2, T2Quals); 4361 4362 // C++ [dcl.init.ref]p4: 4363 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 4364 // reference-related to T2 and cv1 is the same cv-qualification 4365 // as, or greater cv-qualification than, cv2. For purposes of 4366 // overload resolution, cases for which cv1 is greater 4367 // cv-qualification than cv2 are identified as 4368 // reference-compatible with added qualification (see 13.3.3.2). 4369 if (T1Quals.getCVRQualifiers() == T2Quals.getCVRQualifiers()) 4370 return Ref_Compatible; 4371 else if (T1.isMoreQualifiedThan(T2)) 4372 return Ref_Compatible_With_Added_Qualification; 4373 else 4374 return Ref_Related; 4375} 4376 4377/// CheckReferenceInit - Check the initialization of a reference 4378/// variable with the given initializer (C++ [dcl.init.ref]). Init is 4379/// the initializer (either a simple initializer or an initializer 4380/// list), and DeclType is the type of the declaration. When ICS is 4381/// non-null, this routine will compute the implicit conversion 4382/// sequence according to C++ [over.ics.ref] and will not produce any 4383/// diagnostics; when ICS is null, it will emit diagnostics when any 4384/// errors are found. Either way, a return value of true indicates 4385/// that there was a failure, a return value of false indicates that 4386/// the reference initialization succeeded. 4387/// 4388/// When @p SuppressUserConversions, user-defined conversions are 4389/// suppressed. 4390/// When @p AllowExplicit, we also permit explicit user-defined 4391/// conversion functions. 4392/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 4393/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 4394/// This is used when this is called from a C-style cast. 4395bool 4396Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 4397 SourceLocation DeclLoc, 4398 bool SuppressUserConversions, 4399 bool AllowExplicit, bool ForceRValue, 4400 ImplicitConversionSequence *ICS, 4401 bool IgnoreBaseAccess) { 4402 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 4403 4404 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 4405 QualType T2 = Init->getType(); 4406 4407 // If the initializer is the address of an overloaded function, try 4408 // to resolve the overloaded function. If all goes well, T2 is the 4409 // type of the resulting function. 4410 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 4411 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 4412 ICS != 0); 4413 if (Fn) { 4414 // Since we're performing this reference-initialization for 4415 // real, update the initializer with the resulting function. 4416 if (!ICS) { 4417 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 4418 return true; 4419 4420 Init = FixOverloadedFunctionReference(Init, Fn); 4421 } 4422 4423 T2 = Fn->getType(); 4424 } 4425 } 4426 4427 // Compute some basic properties of the types and the initializer. 4428 bool isRValRef = DeclType->isRValueReferenceType(); 4429 bool DerivedToBase = false; 4430 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 4431 Init->isLvalue(Context); 4432 ReferenceCompareResult RefRelationship 4433 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 4434 4435 // Most paths end in a failed conversion. 4436 if (ICS) { 4437 ICS->setBad(BadConversionSequence::no_conversion, Init, DeclType); 4438 } 4439 4440 // C++ [dcl.init.ref]p5: 4441 // A reference to type "cv1 T1" is initialized by an expression 4442 // of type "cv2 T2" as follows: 4443 4444 // -- If the initializer expression 4445 4446 // Rvalue references cannot bind to lvalues (N2812). 4447 // There is absolutely no situation where they can. In particular, note that 4448 // this is ill-formed, even if B has a user-defined conversion to A&&: 4449 // B b; 4450 // A&& r = b; 4451 if (isRValRef && InitLvalue == Expr::LV_Valid) { 4452 if (!ICS) 4453 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4454 << Init->getSourceRange(); 4455 return true; 4456 } 4457 4458 bool BindsDirectly = false; 4459 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 4460 // reference-compatible with "cv2 T2," or 4461 // 4462 // Note that the bit-field check is skipped if we are just computing 4463 // the implicit conversion sequence (C++ [over.best.ics]p2). 4464 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 4465 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4466 BindsDirectly = true; 4467 4468 if (ICS) { 4469 // C++ [over.ics.ref]p1: 4470 // When a parameter of reference type binds directly (8.5.3) 4471 // to an argument expression, the implicit conversion sequence 4472 // is the identity conversion, unless the argument expression 4473 // has a type that is a derived class of the parameter type, 4474 // in which case the implicit conversion sequence is a 4475 // derived-to-base Conversion (13.3.3.1). 4476 ICS->setStandard(); 4477 ICS->Standard.First = ICK_Identity; 4478 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4479 ICS->Standard.Third = ICK_Identity; 4480 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4481 ICS->Standard.setToType(0, T2); 4482 ICS->Standard.setToType(1, T1); 4483 ICS->Standard.setToType(2, T1); 4484 ICS->Standard.ReferenceBinding = true; 4485 ICS->Standard.DirectBinding = true; 4486 ICS->Standard.RRefBinding = false; 4487 ICS->Standard.CopyConstructor = 0; 4488 4489 // Nothing more to do: the inaccessibility/ambiguity check for 4490 // derived-to-base conversions is suppressed when we're 4491 // computing the implicit conversion sequence (C++ 4492 // [over.best.ics]p2). 4493 return false; 4494 } else { 4495 // Perform the conversion. 4496 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4497 if (DerivedToBase) 4498 CK = CastExpr::CK_DerivedToBase; 4499 else if(CheckExceptionSpecCompatibility(Init, T1)) 4500 return true; 4501 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 4502 } 4503 } 4504 4505 // -- has a class type (i.e., T2 is a class type) and can be 4506 // implicitly converted to an lvalue of type "cv3 T3," 4507 // where "cv1 T1" is reference-compatible with "cv3 T3" 4508 // 92) (this conversion is selected by enumerating the 4509 // applicable conversion functions (13.3.1.6) and choosing 4510 // the best one through overload resolution (13.3)), 4511 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 4512 !RequireCompleteType(DeclLoc, T2, 0)) { 4513 CXXRecordDecl *T2RecordDecl 4514 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 4515 4516 OverloadCandidateSet CandidateSet(DeclLoc); 4517 const UnresolvedSetImpl *Conversions 4518 = T2RecordDecl->getVisibleConversionFunctions(); 4519 for (UnresolvedSetImpl::iterator I = Conversions->begin(), 4520 E = Conversions->end(); I != E; ++I) { 4521 NamedDecl *D = *I; 4522 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); 4523 if (isa<UsingShadowDecl>(D)) 4524 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 4525 4526 FunctionTemplateDecl *ConvTemplate 4527 = dyn_cast<FunctionTemplateDecl>(D); 4528 CXXConversionDecl *Conv; 4529 if (ConvTemplate) 4530 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 4531 else 4532 Conv = cast<CXXConversionDecl>(D); 4533 4534 // If the conversion function doesn't return a reference type, 4535 // it can't be considered for this conversion. 4536 if (Conv->getConversionType()->isLValueReferenceType() && 4537 (AllowExplicit || !Conv->isExplicit())) { 4538 if (ConvTemplate) 4539 AddTemplateConversionCandidate(ConvTemplate, I.getPair(), ActingDC, 4540 Init, DeclType, CandidateSet); 4541 else 4542 AddConversionCandidate(Conv, I.getPair(), ActingDC, Init, 4543 DeclType, CandidateSet); 4544 } 4545 } 4546 4547 OverloadCandidateSet::iterator Best; 4548 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 4549 case OR_Success: 4550 // C++ [over.ics.ref]p1: 4551 // 4552 // [...] If the parameter binds directly to the result of 4553 // applying a conversion function to the argument 4554 // expression, the implicit conversion sequence is a 4555 // user-defined conversion sequence (13.3.3.1.2), with the 4556 // second standard conversion sequence either an identity 4557 // conversion or, if the conversion function returns an 4558 // entity of a type that is a derived class of the parameter 4559 // type, a derived-to-base Conversion. 4560 if (!Best->FinalConversion.DirectBinding) 4561 break; 4562 4563 // This is a direct binding. 4564 BindsDirectly = true; 4565 4566 if (ICS) { 4567 ICS->setUserDefined(); 4568 ICS->UserDefined.Before = Best->Conversions[0].Standard; 4569 ICS->UserDefined.After = Best->FinalConversion; 4570 ICS->UserDefined.ConversionFunction = Best->Function; 4571 ICS->UserDefined.EllipsisConversion = false; 4572 assert(ICS->UserDefined.After.ReferenceBinding && 4573 ICS->UserDefined.After.DirectBinding && 4574 "Expected a direct reference binding!"); 4575 return false; 4576 } else { 4577 OwningExprResult InitConversion = 4578 BuildCXXCastArgument(DeclLoc, QualType(), 4579 CastExpr::CK_UserDefinedConversion, 4580 cast<CXXMethodDecl>(Best->Function), 4581 Owned(Init)); 4582 Init = InitConversion.takeAs<Expr>(); 4583 4584 if (CheckExceptionSpecCompatibility(Init, T1)) 4585 return true; 4586 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 4587 /*isLvalue=*/true); 4588 } 4589 break; 4590 4591 case OR_Ambiguous: 4592 if (ICS) { 4593 ICS->setAmbiguous(); 4594 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 4595 Cand != CandidateSet.end(); ++Cand) 4596 if (Cand->Viable) 4597 ICS->Ambiguous.addConversion(Cand->Function); 4598 break; 4599 } 4600 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 4601 << Init->getSourceRange(); 4602 PrintOverloadCandidates(CandidateSet, OCD_ViableCandidates, &Init, 1); 4603 return true; 4604 4605 case OR_No_Viable_Function: 4606 case OR_Deleted: 4607 // There was no suitable conversion, or we found a deleted 4608 // conversion; continue with other checks. 4609 break; 4610 } 4611 } 4612 4613 if (BindsDirectly) { 4614 // C++ [dcl.init.ref]p4: 4615 // [...] In all cases where the reference-related or 4616 // reference-compatible relationship of two types is used to 4617 // establish the validity of a reference binding, and T1 is a 4618 // base class of T2, a program that necessitates such a binding 4619 // is ill-formed if T1 is an inaccessible (clause 11) or 4620 // ambiguous (10.2) base class of T2. 4621 // 4622 // Note that we only check this condition when we're allowed to 4623 // complain about errors, because we should not be checking for 4624 // ambiguity (or inaccessibility) unless the reference binding 4625 // actually happens. 4626 if (DerivedToBase) 4627 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 4628 Init->getSourceRange(), 4629 IgnoreBaseAccess); 4630 else 4631 return false; 4632 } 4633 4634 // -- Otherwise, the reference shall be to a non-volatile const 4635 // type (i.e., cv1 shall be const), or the reference shall be an 4636 // rvalue reference and the initializer expression shall be an rvalue. 4637 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4638 if (!ICS) 4639 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4640 << T1.isVolatileQualified() 4641 << T1 << int(InitLvalue != Expr::LV_Valid) 4642 << T2 << Init->getSourceRange(); 4643 return true; 4644 } 4645 4646 // -- If the initializer expression is an rvalue, with T2 a 4647 // class type, and "cv1 T1" is reference-compatible with 4648 // "cv2 T2," the reference is bound in one of the 4649 // following ways (the choice is implementation-defined): 4650 // 4651 // -- The reference is bound to the object represented by 4652 // the rvalue (see 3.10) or to a sub-object within that 4653 // object. 4654 // 4655 // -- A temporary of type "cv1 T2" [sic] is created, and 4656 // a constructor is called to copy the entire rvalue 4657 // object into the temporary. The reference is bound to 4658 // the temporary or to a sub-object within the 4659 // temporary. 4660 // 4661 // The constructor that would be used to make the copy 4662 // shall be callable whether or not the copy is actually 4663 // done. 4664 // 4665 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4666 // freedom, so we will always take the first option and never build 4667 // a temporary in this case. FIXME: We will, however, have to check 4668 // for the presence of a copy constructor in C++98/03 mode. 4669 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4670 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4671 if (ICS) { 4672 ICS->setStandard(); 4673 ICS->Standard.First = ICK_Identity; 4674 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4675 ICS->Standard.Third = ICK_Identity; 4676 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4677 ICS->Standard.setToType(0, T2); 4678 ICS->Standard.setToType(1, T1); 4679 ICS->Standard.setToType(2, T1); 4680 ICS->Standard.ReferenceBinding = true; 4681 ICS->Standard.DirectBinding = false; 4682 ICS->Standard.RRefBinding = isRValRef; 4683 ICS->Standard.CopyConstructor = 0; 4684 } else { 4685 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4686 if (DerivedToBase) 4687 CK = CastExpr::CK_DerivedToBase; 4688 else if(CheckExceptionSpecCompatibility(Init, T1)) 4689 return true; 4690 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4691 } 4692 return false; 4693 } 4694 4695 // -- Otherwise, a temporary of type "cv1 T1" is created and 4696 // initialized from the initializer expression using the 4697 // rules for a non-reference copy initialization (8.5). The 4698 // reference is then bound to the temporary. If T1 is 4699 // reference-related to T2, cv1 must be the same 4700 // cv-qualification as, or greater cv-qualification than, 4701 // cv2; otherwise, the program is ill-formed. 4702 if (RefRelationship == Ref_Related) { 4703 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4704 // we would be reference-compatible or reference-compatible with 4705 // added qualification. But that wasn't the case, so the reference 4706 // initialization fails. 4707 if (!ICS) 4708 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4709 << T1 << int(InitLvalue != Expr::LV_Valid) 4710 << T2 << Init->getSourceRange(); 4711 return true; 4712 } 4713 4714 // If at least one of the types is a class type, the types are not 4715 // related, and we aren't allowed any user conversions, the 4716 // reference binding fails. This case is important for breaking 4717 // recursion, since TryImplicitConversion below will attempt to 4718 // create a temporary through the use of a copy constructor. 4719 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4720 (T1->isRecordType() || T2->isRecordType())) { 4721 if (!ICS) 4722 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4723 << DeclType << Init->getType() << AA_Initializing << Init->getSourceRange(); 4724 return true; 4725 } 4726 4727 // Actually try to convert the initializer to T1. 4728 if (ICS) { 4729 // C++ [over.ics.ref]p2: 4730 // 4731 // When a parameter of reference type is not bound directly to 4732 // an argument expression, the conversion sequence is the one 4733 // required to convert the argument expression to the 4734 // underlying type of the reference according to 4735 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4736 // to copy-initializing a temporary of the underlying type with 4737 // the argument expression. Any difference in top-level 4738 // cv-qualification is subsumed by the initialization itself 4739 // and does not constitute a conversion. 4740 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4741 /*AllowExplicit=*/false, 4742 /*ForceRValue=*/false, 4743 /*InOverloadResolution=*/false); 4744 4745 // Of course, that's still a reference binding. 4746 if (ICS->isStandard()) { 4747 ICS->Standard.ReferenceBinding = true; 4748 ICS->Standard.RRefBinding = isRValRef; 4749 } else if (ICS->isUserDefined()) { 4750 ICS->UserDefined.After.ReferenceBinding = true; 4751 ICS->UserDefined.After.RRefBinding = isRValRef; 4752 } 4753 return ICS->isBad(); 4754 } else { 4755 ImplicitConversionSequence Conversions; 4756 bool badConversion = PerformImplicitConversion(Init, T1, AA_Initializing, 4757 false, false, 4758 Conversions); 4759 if (badConversion) { 4760 if (Conversions.isAmbiguous()) { 4761 Diag(DeclLoc, 4762 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4763 for (int j = Conversions.Ambiguous.conversions().size()-1; 4764 j >= 0; j--) { 4765 FunctionDecl *Func = Conversions.Ambiguous.conversions()[j]; 4766 NoteOverloadCandidate(Func); 4767 } 4768 } 4769 else { 4770 if (isRValRef) 4771 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4772 << Init->getSourceRange(); 4773 else 4774 Diag(DeclLoc, diag::err_invalid_initialization) 4775 << DeclType << Init->getType() << Init->getSourceRange(); 4776 } 4777 } 4778 return badConversion; 4779 } 4780} 4781 4782static inline bool 4783CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4784 const FunctionDecl *FnDecl) { 4785 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4786 if (isa<NamespaceDecl>(DC)) { 4787 return SemaRef.Diag(FnDecl->getLocation(), 4788 diag::err_operator_new_delete_declared_in_namespace) 4789 << FnDecl->getDeclName(); 4790 } 4791 4792 if (isa<TranslationUnitDecl>(DC) && 4793 FnDecl->getStorageClass() == FunctionDecl::Static) { 4794 return SemaRef.Diag(FnDecl->getLocation(), 4795 diag::err_operator_new_delete_declared_static) 4796 << FnDecl->getDeclName(); 4797 } 4798 4799 return false; 4800} 4801 4802static inline bool 4803CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4804 CanQualType ExpectedResultType, 4805 CanQualType ExpectedFirstParamType, 4806 unsigned DependentParamTypeDiag, 4807 unsigned InvalidParamTypeDiag) { 4808 QualType ResultType = 4809 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4810 4811 // Check that the result type is not dependent. 4812 if (ResultType->isDependentType()) 4813 return SemaRef.Diag(FnDecl->getLocation(), 4814 diag::err_operator_new_delete_dependent_result_type) 4815 << FnDecl->getDeclName() << ExpectedResultType; 4816 4817 // Check that the result type is what we expect. 4818 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4819 return SemaRef.Diag(FnDecl->getLocation(), 4820 diag::err_operator_new_delete_invalid_result_type) 4821 << FnDecl->getDeclName() << ExpectedResultType; 4822 4823 // A function template must have at least 2 parameters. 4824 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4825 return SemaRef.Diag(FnDecl->getLocation(), 4826 diag::err_operator_new_delete_template_too_few_parameters) 4827 << FnDecl->getDeclName(); 4828 4829 // The function decl must have at least 1 parameter. 4830 if (FnDecl->getNumParams() == 0) 4831 return SemaRef.Diag(FnDecl->getLocation(), 4832 diag::err_operator_new_delete_too_few_parameters) 4833 << FnDecl->getDeclName(); 4834 4835 // Check the the first parameter type is not dependent. 4836 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4837 if (FirstParamType->isDependentType()) 4838 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4839 << FnDecl->getDeclName() << ExpectedFirstParamType; 4840 4841 // Check that the first parameter type is what we expect. 4842 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4843 ExpectedFirstParamType) 4844 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4845 << FnDecl->getDeclName() << ExpectedFirstParamType; 4846 4847 return false; 4848} 4849 4850static bool 4851CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4852 // C++ [basic.stc.dynamic.allocation]p1: 4853 // A program is ill-formed if an allocation function is declared in a 4854 // namespace scope other than global scope or declared static in global 4855 // scope. 4856 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4857 return true; 4858 4859 CanQualType SizeTy = 4860 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4861 4862 // C++ [basic.stc.dynamic.allocation]p1: 4863 // The return type shall be void*. The first parameter shall have type 4864 // std::size_t. 4865 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4866 SizeTy, 4867 diag::err_operator_new_dependent_param_type, 4868 diag::err_operator_new_param_type)) 4869 return true; 4870 4871 // C++ [basic.stc.dynamic.allocation]p1: 4872 // The first parameter shall not have an associated default argument. 4873 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4874 return SemaRef.Diag(FnDecl->getLocation(), 4875 diag::err_operator_new_default_arg) 4876 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4877 4878 return false; 4879} 4880 4881static bool 4882CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4883 // C++ [basic.stc.dynamic.deallocation]p1: 4884 // A program is ill-formed if deallocation functions are declared in a 4885 // namespace scope other than global scope or declared static in global 4886 // scope. 4887 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4888 return true; 4889 4890 // C++ [basic.stc.dynamic.deallocation]p2: 4891 // Each deallocation function shall return void and its first parameter 4892 // shall be void*. 4893 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4894 SemaRef.Context.VoidPtrTy, 4895 diag::err_operator_delete_dependent_param_type, 4896 diag::err_operator_delete_param_type)) 4897 return true; 4898 4899 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4900 if (FirstParamType->isDependentType()) 4901 return SemaRef.Diag(FnDecl->getLocation(), 4902 diag::err_operator_delete_dependent_param_type) 4903 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4904 4905 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4906 SemaRef.Context.VoidPtrTy) 4907 return SemaRef.Diag(FnDecl->getLocation(), 4908 diag::err_operator_delete_param_type) 4909 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4910 4911 return false; 4912} 4913 4914/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4915/// of this overloaded operator is well-formed. If so, returns false; 4916/// otherwise, emits appropriate diagnostics and returns true. 4917bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4918 assert(FnDecl && FnDecl->isOverloadedOperator() && 4919 "Expected an overloaded operator declaration"); 4920 4921 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4922 4923 // C++ [over.oper]p5: 4924 // The allocation and deallocation functions, operator new, 4925 // operator new[], operator delete and operator delete[], are 4926 // described completely in 3.7.3. The attributes and restrictions 4927 // found in the rest of this subclause do not apply to them unless 4928 // explicitly stated in 3.7.3. 4929 if (Op == OO_Delete || Op == OO_Array_Delete) 4930 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4931 4932 if (Op == OO_New || Op == OO_Array_New) 4933 return CheckOperatorNewDeclaration(*this, FnDecl); 4934 4935 // C++ [over.oper]p6: 4936 // An operator function shall either be a non-static member 4937 // function or be a non-member function and have at least one 4938 // parameter whose type is a class, a reference to a class, an 4939 // enumeration, or a reference to an enumeration. 4940 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4941 if (MethodDecl->isStatic()) 4942 return Diag(FnDecl->getLocation(), 4943 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4944 } else { 4945 bool ClassOrEnumParam = false; 4946 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4947 ParamEnd = FnDecl->param_end(); 4948 Param != ParamEnd; ++Param) { 4949 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4950 if (ParamType->isDependentType() || ParamType->isRecordType() || 4951 ParamType->isEnumeralType()) { 4952 ClassOrEnumParam = true; 4953 break; 4954 } 4955 } 4956 4957 if (!ClassOrEnumParam) 4958 return Diag(FnDecl->getLocation(), 4959 diag::err_operator_overload_needs_class_or_enum) 4960 << FnDecl->getDeclName(); 4961 } 4962 4963 // C++ [over.oper]p8: 4964 // An operator function cannot have default arguments (8.3.6), 4965 // except where explicitly stated below. 4966 // 4967 // Only the function-call operator allows default arguments 4968 // (C++ [over.call]p1). 4969 if (Op != OO_Call) { 4970 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4971 Param != FnDecl->param_end(); ++Param) { 4972 if ((*Param)->hasDefaultArg()) 4973 return Diag((*Param)->getLocation(), 4974 diag::err_operator_overload_default_arg) 4975 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4976 } 4977 } 4978 4979 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4980 { false, false, false } 4981#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4982 , { Unary, Binary, MemberOnly } 4983#include "clang/Basic/OperatorKinds.def" 4984 }; 4985 4986 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4987 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4988 bool MustBeMemberOperator = OperatorUses[Op][2]; 4989 4990 // C++ [over.oper]p8: 4991 // [...] Operator functions cannot have more or fewer parameters 4992 // than the number required for the corresponding operator, as 4993 // described in the rest of this subclause. 4994 unsigned NumParams = FnDecl->getNumParams() 4995 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4996 if (Op != OO_Call && 4997 ((NumParams == 1 && !CanBeUnaryOperator) || 4998 (NumParams == 2 && !CanBeBinaryOperator) || 4999 (NumParams < 1) || (NumParams > 2))) { 5000 // We have the wrong number of parameters. 5001 unsigned ErrorKind; 5002 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5003 ErrorKind = 2; // 2 -> unary or binary. 5004 } else if (CanBeUnaryOperator) { 5005 ErrorKind = 0; // 0 -> unary 5006 } else { 5007 assert(CanBeBinaryOperator && 5008 "All non-call overloaded operators are unary or binary!"); 5009 ErrorKind = 1; // 1 -> binary 5010 } 5011 5012 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5013 << FnDecl->getDeclName() << NumParams << ErrorKind; 5014 } 5015 5016 // Overloaded operators other than operator() cannot be variadic. 5017 if (Op != OO_Call && 5018 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5019 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5020 << FnDecl->getDeclName(); 5021 } 5022 5023 // Some operators must be non-static member functions. 5024 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5025 return Diag(FnDecl->getLocation(), 5026 diag::err_operator_overload_must_be_member) 5027 << FnDecl->getDeclName(); 5028 } 5029 5030 // C++ [over.inc]p1: 5031 // The user-defined function called operator++ implements the 5032 // prefix and postfix ++ operator. If this function is a member 5033 // function with no parameters, or a non-member function with one 5034 // parameter of class or enumeration type, it defines the prefix 5035 // increment operator ++ for objects of that type. If the function 5036 // is a member function with one parameter (which shall be of type 5037 // int) or a non-member function with two parameters (the second 5038 // of which shall be of type int), it defines the postfix 5039 // increment operator ++ for objects of that type. 5040 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5041 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5042 bool ParamIsInt = false; 5043 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5044 ParamIsInt = BT->getKind() == BuiltinType::Int; 5045 5046 if (!ParamIsInt) 5047 return Diag(LastParam->getLocation(), 5048 diag::err_operator_overload_post_incdec_must_be_int) 5049 << LastParam->getType() << (Op == OO_MinusMinus); 5050 } 5051 5052 // Notify the class if it got an assignment operator. 5053 if (Op == OO_Equal) { 5054 // Would have returned earlier otherwise. 5055 assert(isa<CXXMethodDecl>(FnDecl) && 5056 "Overloaded = not member, but not filtered."); 5057 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5058 Method->getParent()->addedAssignmentOperator(Context, Method); 5059 } 5060 5061 return false; 5062} 5063 5064/// CheckLiteralOperatorDeclaration - Check whether the declaration 5065/// of this literal operator function is well-formed. If so, returns 5066/// false; otherwise, emits appropriate diagnostics and returns true. 5067bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5068 DeclContext *DC = FnDecl->getDeclContext(); 5069 Decl::Kind Kind = DC->getDeclKind(); 5070 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5071 Kind != Decl::LinkageSpec) { 5072 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5073 << FnDecl->getDeclName(); 5074 return true; 5075 } 5076 5077 bool Valid = false; 5078 5079 // FIXME: Check for the one valid template signature 5080 // template <char...> type operator "" name(); 5081 5082 if (FunctionDecl::param_iterator Param = FnDecl->param_begin()) { 5083 // Check the first parameter 5084 QualType T = (*Param)->getType(); 5085 5086 // unsigned long long int and long double are allowed, but only 5087 // alone. 5088 // We also allow any character type; their omission seems to be a bug 5089 // in n3000 5090 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5091 Context.hasSameType(T, Context.LongDoubleTy) || 5092 Context.hasSameType(T, Context.CharTy) || 5093 Context.hasSameType(T, Context.WCharTy) || 5094 Context.hasSameType(T, Context.Char16Ty) || 5095 Context.hasSameType(T, Context.Char32Ty)) { 5096 if (++Param == FnDecl->param_end()) 5097 Valid = true; 5098 goto FinishedParams; 5099 } 5100 5101 // Otherwise it must be a pointer to const; let's strip those. 5102 const PointerType *PT = T->getAs<PointerType>(); 5103 if (!PT) 5104 goto FinishedParams; 5105 T = PT->getPointeeType(); 5106 if (!T.isConstQualified()) 5107 goto FinishedParams; 5108 T = T.getUnqualifiedType(); 5109 5110 // Move on to the second parameter; 5111 ++Param; 5112 5113 // If there is no second parameter, the first must be a const char * 5114 if (Param == FnDecl->param_end()) { 5115 if (Context.hasSameType(T, Context.CharTy)) 5116 Valid = true; 5117 goto FinishedParams; 5118 } 5119 5120 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5121 // are allowed as the first parameter to a two-parameter function 5122 if (!(Context.hasSameType(T, Context.CharTy) || 5123 Context.hasSameType(T, Context.WCharTy) || 5124 Context.hasSameType(T, Context.Char16Ty) || 5125 Context.hasSameType(T, Context.Char32Ty))) 5126 goto FinishedParams; 5127 5128 // The second and final parameter must be an std::size_t 5129 T = (*Param)->getType().getUnqualifiedType(); 5130 if (Context.hasSameType(T, Context.getSizeType()) && 5131 ++Param == FnDecl->param_end()) 5132 Valid = true; 5133 } 5134 5135 // FIXME: This diagnostic is absolutely terrible. 5136FinishedParams: 5137 if (!Valid) { 5138 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5139 << FnDecl->getDeclName(); 5140 return true; 5141 } 5142 5143 return false; 5144} 5145 5146/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5147/// linkage specification, including the language and (if present) 5148/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5149/// the location of the language string literal, which is provided 5150/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5151/// the '{' brace. Otherwise, this linkage specification does not 5152/// have any braces. 5153Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5154 SourceLocation ExternLoc, 5155 SourceLocation LangLoc, 5156 const char *Lang, 5157 unsigned StrSize, 5158 SourceLocation LBraceLoc) { 5159 LinkageSpecDecl::LanguageIDs Language; 5160 if (strncmp(Lang, "\"C\"", StrSize) == 0) 5161 Language = LinkageSpecDecl::lang_c; 5162 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 5163 Language = LinkageSpecDecl::lang_cxx; 5164 else { 5165 Diag(LangLoc, diag::err_bad_language); 5166 return DeclPtrTy(); 5167 } 5168 5169 // FIXME: Add all the various semantics of linkage specifications 5170 5171 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5172 LangLoc, Language, 5173 LBraceLoc.isValid()); 5174 CurContext->addDecl(D); 5175 PushDeclContext(S, D); 5176 return DeclPtrTy::make(D); 5177} 5178 5179/// ActOnFinishLinkageSpecification - Completely the definition of 5180/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5181/// valid, it's the position of the closing '}' brace in a linkage 5182/// specification that uses braces. 5183Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5184 DeclPtrTy LinkageSpec, 5185 SourceLocation RBraceLoc) { 5186 if (LinkageSpec) 5187 PopDeclContext(); 5188 return LinkageSpec; 5189} 5190 5191/// \brief Perform semantic analysis for the variable declaration that 5192/// occurs within a C++ catch clause, returning the newly-created 5193/// variable. 5194VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5195 TypeSourceInfo *TInfo, 5196 IdentifierInfo *Name, 5197 SourceLocation Loc, 5198 SourceRange Range) { 5199 bool Invalid = false; 5200 5201 // Arrays and functions decay. 5202 if (ExDeclType->isArrayType()) 5203 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5204 else if (ExDeclType->isFunctionType()) 5205 ExDeclType = Context.getPointerType(ExDeclType); 5206 5207 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5208 // The exception-declaration shall not denote a pointer or reference to an 5209 // incomplete type, other than [cv] void*. 5210 // N2844 forbids rvalue references. 5211 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5212 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5213 Invalid = true; 5214 } 5215 5216 // GCC allows catching pointers and references to incomplete types 5217 // as an extension; so do we, but we warn by default. 5218 5219 QualType BaseType = ExDeclType; 5220 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5221 unsigned DK = diag::err_catch_incomplete; 5222 bool IncompleteCatchIsInvalid = true; 5223 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5224 BaseType = Ptr->getPointeeType(); 5225 Mode = 1; 5226 DK = diag::ext_catch_incomplete_ptr; 5227 IncompleteCatchIsInvalid = false; 5228 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5229 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5230 BaseType = Ref->getPointeeType(); 5231 Mode = 2; 5232 DK = diag::ext_catch_incomplete_ref; 5233 IncompleteCatchIsInvalid = false; 5234 } 5235 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5236 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5237 IncompleteCatchIsInvalid) 5238 Invalid = true; 5239 5240 if (!Invalid && !ExDeclType->isDependentType() && 5241 RequireNonAbstractType(Loc, ExDeclType, 5242 diag::err_abstract_type_in_decl, 5243 AbstractVariableType)) 5244 Invalid = true; 5245 5246 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5247 Name, ExDeclType, TInfo, VarDecl::None); 5248 5249 if (!Invalid) { 5250 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5251 // C++ [except.handle]p16: 5252 // The object declared in an exception-declaration or, if the 5253 // exception-declaration does not specify a name, a temporary (12.2) is 5254 // copy-initialized (8.5) from the exception object. [...] 5255 // The object is destroyed when the handler exits, after the destruction 5256 // of any automatic objects initialized within the handler. 5257 // 5258 // We just pretend to initialize the object with itself, then make sure 5259 // it can be destroyed later. 5260 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5261 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5262 Loc, ExDeclType, 0); 5263 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5264 SourceLocation()); 5265 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5266 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5267 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5268 if (Result.isInvalid()) 5269 Invalid = true; 5270 else 5271 FinalizeVarWithDestructor(ExDecl, RecordTy); 5272 } 5273 } 5274 5275 if (Invalid) 5276 ExDecl->setInvalidDecl(); 5277 5278 return ExDecl; 5279} 5280 5281/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5282/// handler. 5283Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5284 TypeSourceInfo *TInfo = 0; 5285 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5286 5287 bool Invalid = D.isInvalidType(); 5288 IdentifierInfo *II = D.getIdentifier(); 5289 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 5290 // The scope should be freshly made just for us. There is just no way 5291 // it contains any previous declaration. 5292 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5293 if (PrevDecl->isTemplateParameter()) { 5294 // Maybe we will complain about the shadowed template parameter. 5295 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5296 } 5297 } 5298 5299 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5300 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5301 << D.getCXXScopeSpec().getRange(); 5302 Invalid = true; 5303 } 5304 5305 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5306 D.getIdentifier(), 5307 D.getIdentifierLoc(), 5308 D.getDeclSpec().getSourceRange()); 5309 5310 if (Invalid) 5311 ExDecl->setInvalidDecl(); 5312 5313 // Add the exception declaration into this scope. 5314 if (II) 5315 PushOnScopeChains(ExDecl, S); 5316 else 5317 CurContext->addDecl(ExDecl); 5318 5319 ProcessDeclAttributes(S, ExDecl, D); 5320 return DeclPtrTy::make(ExDecl); 5321} 5322 5323Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5324 ExprArg assertexpr, 5325 ExprArg assertmessageexpr) { 5326 Expr *AssertExpr = (Expr *)assertexpr.get(); 5327 StringLiteral *AssertMessage = 5328 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5329 5330 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5331 llvm::APSInt Value(32); 5332 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5333 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5334 AssertExpr->getSourceRange(); 5335 return DeclPtrTy(); 5336 } 5337 5338 if (Value == 0) { 5339 Diag(AssertLoc, diag::err_static_assert_failed) 5340 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5341 } 5342 } 5343 5344 assertexpr.release(); 5345 assertmessageexpr.release(); 5346 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5347 AssertExpr, AssertMessage); 5348 5349 CurContext->addDecl(Decl); 5350 return DeclPtrTy::make(Decl); 5351} 5352 5353/// Handle a friend type declaration. This works in tandem with 5354/// ActOnTag. 5355/// 5356/// Notes on friend class templates: 5357/// 5358/// We generally treat friend class declarations as if they were 5359/// declaring a class. So, for example, the elaborated type specifier 5360/// in a friend declaration is required to obey the restrictions of a 5361/// class-head (i.e. no typedefs in the scope chain), template 5362/// parameters are required to match up with simple template-ids, &c. 5363/// However, unlike when declaring a template specialization, it's 5364/// okay to refer to a template specialization without an empty 5365/// template parameter declaration, e.g. 5366/// friend class A<T>::B<unsigned>; 5367/// We permit this as a special case; if there are any template 5368/// parameters present at all, require proper matching, i.e. 5369/// template <> template <class T> friend class A<int>::B; 5370Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5371 MultiTemplateParamsArg TempParams) { 5372 SourceLocation Loc = DS.getSourceRange().getBegin(); 5373 5374 assert(DS.isFriendSpecified()); 5375 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5376 5377 // Try to convert the decl specifier to a type. This works for 5378 // friend templates because ActOnTag never produces a ClassTemplateDecl 5379 // for a TUK_Friend. 5380 Declarator TheDeclarator(DS, Declarator::MemberContext); 5381 QualType T = GetTypeForDeclarator(TheDeclarator, S); 5382 if (TheDeclarator.isInvalidType()) 5383 return DeclPtrTy(); 5384 5385 // This is definitely an error in C++98. It's probably meant to 5386 // be forbidden in C++0x, too, but the specification is just 5387 // poorly written. 5388 // 5389 // The problem is with declarations like the following: 5390 // template <T> friend A<T>::foo; 5391 // where deciding whether a class C is a friend or not now hinges 5392 // on whether there exists an instantiation of A that causes 5393 // 'foo' to equal C. There are restrictions on class-heads 5394 // (which we declare (by fiat) elaborated friend declarations to 5395 // be) that makes this tractable. 5396 // 5397 // FIXME: handle "template <> friend class A<T>;", which 5398 // is possibly well-formed? Who even knows? 5399 if (TempParams.size() && !isa<ElaboratedType>(T)) { 5400 Diag(Loc, diag::err_tagless_friend_type_template) 5401 << DS.getSourceRange(); 5402 return DeclPtrTy(); 5403 } 5404 5405 // C++ [class.friend]p2: 5406 // An elaborated-type-specifier shall be used in a friend declaration 5407 // for a class.* 5408 // * The class-key of the elaborated-type-specifier is required. 5409 // This is one of the rare places in Clang where it's legitimate to 5410 // ask about the "spelling" of the type. 5411 if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) { 5412 // If we evaluated the type to a record type, suggest putting 5413 // a tag in front. 5414 if (const RecordType *RT = T->getAs<RecordType>()) { 5415 RecordDecl *RD = RT->getDecl(); 5416 5417 std::string InsertionText = std::string(" ") + RD->getKindName(); 5418 5419 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 5420 << (unsigned) RD->getTagKind() 5421 << T 5422 << SourceRange(DS.getFriendSpecLoc()) 5423 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 5424 InsertionText); 5425 return DeclPtrTy(); 5426 }else { 5427 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 5428 << DS.getSourceRange(); 5429 return DeclPtrTy(); 5430 } 5431 } 5432 5433 // Enum types cannot be friends. 5434 if (T->getAs<EnumType>()) { 5435 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 5436 << SourceRange(DS.getFriendSpecLoc()); 5437 return DeclPtrTy(); 5438 } 5439 5440 // C++98 [class.friend]p1: A friend of a class is a function 5441 // or class that is not a member of the class . . . 5442 // This is fixed in DR77, which just barely didn't make the C++03 5443 // deadline. It's also a very silly restriction that seriously 5444 // affects inner classes and which nobody else seems to implement; 5445 // thus we never diagnose it, not even in -pedantic. 5446 5447 Decl *D; 5448 if (TempParams.size()) 5449 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5450 TempParams.size(), 5451 (TemplateParameterList**) TempParams.release(), 5452 T.getTypePtr(), 5453 DS.getFriendSpecLoc()); 5454 else 5455 D = FriendDecl::Create(Context, CurContext, Loc, T.getTypePtr(), 5456 DS.getFriendSpecLoc()); 5457 D->setAccess(AS_public); 5458 CurContext->addDecl(D); 5459 5460 return DeclPtrTy::make(D); 5461} 5462 5463Sema::DeclPtrTy 5464Sema::ActOnFriendFunctionDecl(Scope *S, 5465 Declarator &D, 5466 bool IsDefinition, 5467 MultiTemplateParamsArg TemplateParams) { 5468 const DeclSpec &DS = D.getDeclSpec(); 5469 5470 assert(DS.isFriendSpecified()); 5471 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5472 5473 SourceLocation Loc = D.getIdentifierLoc(); 5474 TypeSourceInfo *TInfo = 0; 5475 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5476 5477 // C++ [class.friend]p1 5478 // A friend of a class is a function or class.... 5479 // Note that this sees through typedefs, which is intended. 5480 // It *doesn't* see through dependent types, which is correct 5481 // according to [temp.arg.type]p3: 5482 // If a declaration acquires a function type through a 5483 // type dependent on a template-parameter and this causes 5484 // a declaration that does not use the syntactic form of a 5485 // function declarator to have a function type, the program 5486 // is ill-formed. 5487 if (!T->isFunctionType()) { 5488 Diag(Loc, diag::err_unexpected_friend); 5489 5490 // It might be worthwhile to try to recover by creating an 5491 // appropriate declaration. 5492 return DeclPtrTy(); 5493 } 5494 5495 // C++ [namespace.memdef]p3 5496 // - If a friend declaration in a non-local class first declares a 5497 // class or function, the friend class or function is a member 5498 // of the innermost enclosing namespace. 5499 // - The name of the friend is not found by simple name lookup 5500 // until a matching declaration is provided in that namespace 5501 // scope (either before or after the class declaration granting 5502 // friendship). 5503 // - If a friend function is called, its name may be found by the 5504 // name lookup that considers functions from namespaces and 5505 // classes associated with the types of the function arguments. 5506 // - When looking for a prior declaration of a class or a function 5507 // declared as a friend, scopes outside the innermost enclosing 5508 // namespace scope are not considered. 5509 5510 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5511 DeclarationName Name = GetNameForDeclarator(D); 5512 assert(Name); 5513 5514 // The context we found the declaration in, or in which we should 5515 // create the declaration. 5516 DeclContext *DC; 5517 5518 // FIXME: handle local classes 5519 5520 // Recover from invalid scope qualifiers as if they just weren't there. 5521 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5522 ForRedeclaration); 5523 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5524 // FIXME: RequireCompleteDeclContext 5525 DC = computeDeclContext(ScopeQual); 5526 5527 // FIXME: handle dependent contexts 5528 if (!DC) return DeclPtrTy(); 5529 5530 LookupQualifiedName(Previous, DC); 5531 5532 // If searching in that context implicitly found a declaration in 5533 // a different context, treat it like it wasn't found at all. 5534 // TODO: better diagnostics for this case. Suggesting the right 5535 // qualified scope would be nice... 5536 // FIXME: getRepresentativeDecl() is not right here at all 5537 if (Previous.empty() || 5538 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5539 D.setInvalidType(); 5540 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5541 return DeclPtrTy(); 5542 } 5543 5544 // C++ [class.friend]p1: A friend of a class is a function or 5545 // class that is not a member of the class . . . 5546 if (DC->Equals(CurContext)) 5547 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5548 5549 // Otherwise walk out to the nearest namespace scope looking for matches. 5550 } else { 5551 // TODO: handle local class contexts. 5552 5553 DC = CurContext; 5554 while (true) { 5555 // Skip class contexts. If someone can cite chapter and verse 5556 // for this behavior, that would be nice --- it's what GCC and 5557 // EDG do, and it seems like a reasonable intent, but the spec 5558 // really only says that checks for unqualified existing 5559 // declarations should stop at the nearest enclosing namespace, 5560 // not that they should only consider the nearest enclosing 5561 // namespace. 5562 while (DC->isRecord()) 5563 DC = DC->getParent(); 5564 5565 LookupQualifiedName(Previous, DC); 5566 5567 // TODO: decide what we think about using declarations. 5568 if (!Previous.empty()) 5569 break; 5570 5571 if (DC->isFileContext()) break; 5572 DC = DC->getParent(); 5573 } 5574 5575 // C++ [class.friend]p1: A friend of a class is a function or 5576 // class that is not a member of the class . . . 5577 // C++0x changes this for both friend types and functions. 5578 // Most C++ 98 compilers do seem to give an error here, so 5579 // we do, too. 5580 if (!Previous.empty() && DC->Equals(CurContext) 5581 && !getLangOptions().CPlusPlus0x) 5582 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5583 } 5584 5585 if (DC->isFileContext()) { 5586 // This implies that it has to be an operator or function. 5587 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5588 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5589 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5590 Diag(Loc, diag::err_introducing_special_friend) << 5591 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5592 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5593 return DeclPtrTy(); 5594 } 5595 } 5596 5597 bool Redeclaration = false; 5598 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5599 move(TemplateParams), 5600 IsDefinition, 5601 Redeclaration); 5602 if (!ND) return DeclPtrTy(); 5603 5604 assert(ND->getDeclContext() == DC); 5605 assert(ND->getLexicalDeclContext() == CurContext); 5606 5607 // Add the function declaration to the appropriate lookup tables, 5608 // adjusting the redeclarations list as necessary. We don't 5609 // want to do this yet if the friending class is dependent. 5610 // 5611 // Also update the scope-based lookup if the target context's 5612 // lookup context is in lexical scope. 5613 if (!CurContext->isDependentContext()) { 5614 DC = DC->getLookupContext(); 5615 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5616 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5617 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5618 } 5619 5620 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5621 D.getIdentifierLoc(), ND, 5622 DS.getFriendSpecLoc()); 5623 FrD->setAccess(AS_public); 5624 CurContext->addDecl(FrD); 5625 5626 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) 5627 FrD->setSpecialization(true); 5628 5629 return DeclPtrTy::make(ND); 5630} 5631 5632void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5633 AdjustDeclIfTemplate(dcl); 5634 5635 Decl *Dcl = dcl.getAs<Decl>(); 5636 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5637 if (!Fn) { 5638 Diag(DelLoc, diag::err_deleted_non_function); 5639 return; 5640 } 5641 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5642 Diag(DelLoc, diag::err_deleted_decl_not_first); 5643 Diag(Prev->getLocation(), diag::note_previous_declaration); 5644 // If the declaration wasn't the first, we delete the function anyway for 5645 // recovery. 5646 } 5647 Fn->setDeleted(); 5648} 5649 5650static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5651 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5652 ++CI) { 5653 Stmt *SubStmt = *CI; 5654 if (!SubStmt) 5655 continue; 5656 if (isa<ReturnStmt>(SubStmt)) 5657 Self.Diag(SubStmt->getSourceRange().getBegin(), 5658 diag::err_return_in_constructor_handler); 5659 if (!isa<Expr>(SubStmt)) 5660 SearchForReturnInStmt(Self, SubStmt); 5661 } 5662} 5663 5664void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5665 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5666 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5667 SearchForReturnInStmt(*this, Handler); 5668 } 5669} 5670 5671bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5672 const CXXMethodDecl *Old) { 5673 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5674 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5675 5676 if (Context.hasSameType(NewTy, OldTy) || 5677 NewTy->isDependentType() || OldTy->isDependentType()) 5678 return false; 5679 5680 // Check if the return types are covariant 5681 QualType NewClassTy, OldClassTy; 5682 5683 /// Both types must be pointers or references to classes. 5684 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5685 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5686 NewClassTy = NewPT->getPointeeType(); 5687 OldClassTy = OldPT->getPointeeType(); 5688 } 5689 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5690 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5691 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5692 NewClassTy = NewRT->getPointeeType(); 5693 OldClassTy = OldRT->getPointeeType(); 5694 } 5695 } 5696 } 5697 5698 // The return types aren't either both pointers or references to a class type. 5699 if (NewClassTy.isNull()) { 5700 Diag(New->getLocation(), 5701 diag::err_different_return_type_for_overriding_virtual_function) 5702 << New->getDeclName() << NewTy << OldTy; 5703 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5704 5705 return true; 5706 } 5707 5708 // C++ [class.virtual]p6: 5709 // If the return type of D::f differs from the return type of B::f, the 5710 // class type in the return type of D::f shall be complete at the point of 5711 // declaration of D::f or shall be the class type D. 5712 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5713 if (!RT->isBeingDefined() && 5714 RequireCompleteType(New->getLocation(), NewClassTy, 5715 PDiag(diag::err_covariant_return_incomplete) 5716 << New->getDeclName())) 5717 return true; 5718 } 5719 5720 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5721 // Check if the new class derives from the old class. 5722 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5723 Diag(New->getLocation(), 5724 diag::err_covariant_return_not_derived) 5725 << New->getDeclName() << NewTy << OldTy; 5726 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5727 return true; 5728 } 5729 5730 // Check if we the conversion from derived to base is valid. 5731 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5732 diag::err_covariant_return_inaccessible_base, 5733 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5734 // FIXME: Should this point to the return type? 5735 New->getLocation(), SourceRange(), New->getDeclName())) { 5736 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5737 return true; 5738 } 5739 } 5740 5741 // The qualifiers of the return types must be the same. 5742 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5743 Diag(New->getLocation(), 5744 diag::err_covariant_return_type_different_qualifications) 5745 << New->getDeclName() << NewTy << OldTy; 5746 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5747 return true; 5748 }; 5749 5750 5751 // The new class type must have the same or less qualifiers as the old type. 5752 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5753 Diag(New->getLocation(), 5754 diag::err_covariant_return_type_class_type_more_qualified) 5755 << New->getDeclName() << NewTy << OldTy; 5756 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5757 return true; 5758 }; 5759 5760 return false; 5761} 5762 5763bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5764 const CXXMethodDecl *Old) 5765{ 5766 if (Old->hasAttr<FinalAttr>()) { 5767 Diag(New->getLocation(), diag::err_final_function_overridden) 5768 << New->getDeclName(); 5769 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5770 return true; 5771 } 5772 5773 return false; 5774} 5775 5776/// \brief Mark the given method pure. 5777/// 5778/// \param Method the method to be marked pure. 5779/// 5780/// \param InitRange the source range that covers the "0" initializer. 5781bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5782 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5783 Method->setPure(); 5784 5785 // A class is abstract if at least one function is pure virtual. 5786 Method->getParent()->setAbstract(true); 5787 return false; 5788 } 5789 5790 if (!Method->isInvalidDecl()) 5791 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5792 << Method->getDeclName() << InitRange; 5793 return true; 5794} 5795 5796/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5797/// an initializer for the out-of-line declaration 'Dcl'. The scope 5798/// is a fresh scope pushed for just this purpose. 5799/// 5800/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5801/// static data member of class X, names should be looked up in the scope of 5802/// class X. 5803void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5804 // If there is no declaration, there was an error parsing it. 5805 Decl *D = Dcl.getAs<Decl>(); 5806 if (D == 0) return; 5807 5808 // We should only get called for declarations with scope specifiers, like: 5809 // int foo::bar; 5810 assert(D->isOutOfLine()); 5811 EnterDeclaratorContext(S, D->getDeclContext()); 5812} 5813 5814/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5815/// initializer for the out-of-line declaration 'Dcl'. 5816void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5817 // If there is no declaration, there was an error parsing it. 5818 Decl *D = Dcl.getAs<Decl>(); 5819 if (D == 0) return; 5820 5821 assert(D->isOutOfLine()); 5822 ExitDeclaratorContext(S); 5823} 5824 5825/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5826/// C++ if/switch/while/for statement. 5827/// e.g: "if (int x = f()) {...}" 5828Action::DeclResult 5829Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5830 // C++ 6.4p2: 5831 // The declarator shall not specify a function or an array. 5832 // The type-specifier-seq shall not contain typedef and shall not declare a 5833 // new class or enumeration. 5834 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5835 "Parser allowed 'typedef' as storage class of condition decl."); 5836 5837 TypeSourceInfo *TInfo = 0; 5838 TagDecl *OwnedTag = 0; 5839 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5840 5841 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5842 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5843 // would be created and CXXConditionDeclExpr wants a VarDecl. 5844 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5845 << D.getSourceRange(); 5846 return DeclResult(); 5847 } else if (OwnedTag && OwnedTag->isDefinition()) { 5848 // The type-specifier-seq shall not declare a new class or enumeration. 5849 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5850 } 5851 5852 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5853 if (!Dcl) 5854 return DeclResult(); 5855 5856 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5857 VD->setDeclaredInCondition(true); 5858 return Dcl; 5859} 5860 5861static bool needsVtable(CXXMethodDecl *MD, ASTContext &Context) { 5862 // Ignore dependent types. 5863 if (MD->isDependentContext()) 5864 return false; 5865 5866 // Ignore declarations that are not definitions. 5867 if (!MD->isThisDeclarationADefinition()) 5868 return false; 5869 5870 CXXRecordDecl *RD = MD->getParent(); 5871 5872 // Ignore classes without a vtable. 5873 if (!RD->isDynamicClass()) 5874 return false; 5875 5876 switch (MD->getParent()->getTemplateSpecializationKind()) { 5877 case TSK_Undeclared: 5878 case TSK_ExplicitSpecialization: 5879 // Classes that aren't instantiations of templates don't need their 5880 // virtual methods marked until we see the definition of the key 5881 // function. 5882 break; 5883 5884 case TSK_ImplicitInstantiation: 5885 // This is a constructor of a class template; mark all of the virtual 5886 // members as referenced to ensure that they get instantiatied. 5887 if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) 5888 return true; 5889 break; 5890 5891 case TSK_ExplicitInstantiationDeclaration: 5892 return false; 5893 5894 case TSK_ExplicitInstantiationDefinition: 5895 // This is method of a explicit instantiation; mark all of the virtual 5896 // members as referenced to ensure that they get instantiatied. 5897 return true; 5898 } 5899 5900 // Consider only out-of-line definitions of member functions. When we see 5901 // an inline definition, it's too early to compute the key function. 5902 if (!MD->isOutOfLine()) 5903 return false; 5904 5905 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5906 5907 // If there is no key function, we will need a copy of the vtable. 5908 if (!KeyFunction) 5909 return true; 5910 5911 // If this is the key function, we need to mark virtual members. 5912 if (KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 5913 return true; 5914 5915 return false; 5916} 5917 5918void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5919 CXXMethodDecl *MD) { 5920 CXXRecordDecl *RD = MD->getParent(); 5921 5922 // We will need to mark all of the virtual members as referenced to build the 5923 // vtable. 5924 if (!needsVtable(MD, Context)) 5925 return; 5926 5927 TemplateSpecializationKind kind = RD->getTemplateSpecializationKind(); 5928 if (kind == TSK_ImplicitInstantiation) 5929 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 5930 else 5931 MarkVirtualMembersReferenced(Loc, RD); 5932} 5933 5934bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5935 if (ClassesWithUnmarkedVirtualMembers.empty()) 5936 return false; 5937 5938 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 5939 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 5940 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 5941 ClassesWithUnmarkedVirtualMembers.pop_back(); 5942 MarkVirtualMembersReferenced(Loc, RD); 5943 } 5944 5945 return true; 5946} 5947 5948void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, CXXRecordDecl *RD) { 5949 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5950 e = RD->method_end(); i != e; ++i) { 5951 CXXMethodDecl *MD = *i; 5952 5953 // C++ [basic.def.odr]p2: 5954 // [...] A virtual member function is used if it is not pure. [...] 5955 if (MD->isVirtual() && !MD->isPure()) 5956 MarkDeclarationReferenced(Loc, MD); 5957 } 5958} 5959