SemaDeclCXX.cpp revision 204962
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 if (OldParam->hasUninstantiatedDefaultArg()) 302 NewParam->setUninstantiatedDefaultArg( 303 OldParam->getUninstantiatedDefaultArg()); 304 else 305 NewParam->setDefaultArg(OldParam->getDefaultArg()); 306 } else if (NewParam->hasDefaultArg()) { 307 if (New->getDescribedFunctionTemplate()) { 308 // Paragraph 4, quoted above, only applies to non-template functions. 309 Diag(NewParam->getLocation(), 310 diag::err_param_default_argument_template_redecl) 311 << NewParam->getDefaultArgRange(); 312 Diag(Old->getLocation(), diag::note_template_prev_declaration) 313 << false; 314 } else if (New->getTemplateSpecializationKind() 315 != TSK_ImplicitInstantiation && 316 New->getTemplateSpecializationKind() != TSK_Undeclared) { 317 // C++ [temp.expr.spec]p21: 318 // Default function arguments shall not be specified in a declaration 319 // or a definition for one of the following explicit specializations: 320 // - the explicit specialization of a function template; 321 // - the explicit specialization of a member function template; 322 // - the explicit specialization of a member function of a class 323 // template where the class template specialization to which the 324 // member function specialization belongs is implicitly 325 // instantiated. 326 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 327 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 328 << New->getDeclName() 329 << NewParam->getDefaultArgRange(); 330 } else if (New->getDeclContext()->isDependentContext()) { 331 // C++ [dcl.fct.default]p6 (DR217): 332 // Default arguments for a member function of a class template shall 333 // be specified on the initial declaration of the member function 334 // within the class template. 335 // 336 // Reading the tea leaves a bit in DR217 and its reference to DR205 337 // leads me to the conclusion that one cannot add default function 338 // arguments for an out-of-line definition of a member function of a 339 // dependent type. 340 int WhichKind = 2; 341 if (CXXRecordDecl *Record 342 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 343 if (Record->getDescribedClassTemplate()) 344 WhichKind = 0; 345 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 346 WhichKind = 1; 347 else 348 WhichKind = 2; 349 } 350 351 Diag(NewParam->getLocation(), 352 diag::err_param_default_argument_member_template_redecl) 353 << WhichKind 354 << NewParam->getDefaultArgRange(); 355 } 356 } 357 } 358 359 if (CheckEquivalentExceptionSpec(Old, New)) 360 Invalid = true; 361 362 return Invalid; 363} 364 365/// CheckCXXDefaultArguments - Verify that the default arguments for a 366/// function declaration are well-formed according to C++ 367/// [dcl.fct.default]. 368void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 369 unsigned NumParams = FD->getNumParams(); 370 unsigned p; 371 372 // Find first parameter with a default argument 373 for (p = 0; p < NumParams; ++p) { 374 ParmVarDecl *Param = FD->getParamDecl(p); 375 if (Param->hasDefaultArg()) 376 break; 377 } 378 379 // C++ [dcl.fct.default]p4: 380 // In a given function declaration, all parameters 381 // subsequent to a parameter with a default argument shall 382 // have default arguments supplied in this or previous 383 // declarations. A default argument shall not be redefined 384 // by a later declaration (not even to the same value). 385 unsigned LastMissingDefaultArg = 0; 386 for (; p < NumParams; ++p) { 387 ParmVarDecl *Param = FD->getParamDecl(p); 388 if (!Param->hasDefaultArg()) { 389 if (Param->isInvalidDecl()) 390 /* We already complained about this parameter. */; 391 else if (Param->getIdentifier()) 392 Diag(Param->getLocation(), 393 diag::err_param_default_argument_missing_name) 394 << Param->getIdentifier(); 395 else 396 Diag(Param->getLocation(), 397 diag::err_param_default_argument_missing); 398 399 LastMissingDefaultArg = p; 400 } 401 } 402 403 if (LastMissingDefaultArg > 0) { 404 // Some default arguments were missing. Clear out all of the 405 // default arguments up to (and including) the last missing 406 // default argument, so that we leave the function parameters 407 // in a semantically valid state. 408 for (p = 0; p <= LastMissingDefaultArg; ++p) { 409 ParmVarDecl *Param = FD->getParamDecl(p); 410 if (Param->hasDefaultArg()) { 411 if (!Param->hasUnparsedDefaultArg()) 412 Param->getDefaultArg()->Destroy(Context); 413 Param->setDefaultArg(0); 414 } 415 } 416 } 417} 418 419/// isCurrentClassName - Determine whether the identifier II is the 420/// name of the class type currently being defined. In the case of 421/// nested classes, this will only return true if II is the name of 422/// the innermost class. 423bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 424 const CXXScopeSpec *SS) { 425 assert(getLangOptions().CPlusPlus && "No class names in C!"); 426 427 CXXRecordDecl *CurDecl; 428 if (SS && SS->isSet() && !SS->isInvalid()) { 429 DeclContext *DC = computeDeclContext(*SS, true); 430 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 431 } else 432 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 433 434 if (CurDecl && CurDecl->getIdentifier()) 435 return &II == CurDecl->getIdentifier(); 436 else 437 return false; 438} 439 440/// \brief Check the validity of a C++ base class specifier. 441/// 442/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 443/// and returns NULL otherwise. 444CXXBaseSpecifier * 445Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 446 SourceRange SpecifierRange, 447 bool Virtual, AccessSpecifier Access, 448 QualType BaseType, 449 SourceLocation BaseLoc) { 450 // C++ [class.union]p1: 451 // A union shall not have base classes. 452 if (Class->isUnion()) { 453 Diag(Class->getLocation(), diag::err_base_clause_on_union) 454 << SpecifierRange; 455 return 0; 456 } 457 458 if (BaseType->isDependentType()) 459 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 460 Class->getTagKind() == RecordDecl::TK_class, 461 Access, BaseType); 462 463 // Base specifiers must be record types. 464 if (!BaseType->isRecordType()) { 465 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 466 return 0; 467 } 468 469 // C++ [class.union]p1: 470 // A union shall not be used as a base class. 471 if (BaseType->isUnionType()) { 472 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 473 return 0; 474 } 475 476 // C++ [class.derived]p2: 477 // The class-name in a base-specifier shall not be an incompletely 478 // defined class. 479 if (RequireCompleteType(BaseLoc, BaseType, 480 PDiag(diag::err_incomplete_base_class) 481 << SpecifierRange)) 482 return 0; 483 484 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 485 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 486 assert(BaseDecl && "Record type has no declaration"); 487 BaseDecl = BaseDecl->getDefinition(); 488 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 489 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 490 assert(CXXBaseDecl && "Base type is not a C++ type"); 491 492 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 493 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 494 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 495 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 496 << BaseType; 497 return 0; 498 } 499 500 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 501 502 // Create the base specifier. 503 // FIXME: Allocate via ASTContext? 504 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 505 Class->getTagKind() == RecordDecl::TK_class, 506 Access, BaseType); 507} 508 509void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 510 const CXXRecordDecl *BaseClass, 511 bool BaseIsVirtual) { 512 // A class with a non-empty base class is not empty. 513 // FIXME: Standard ref? 514 if (!BaseClass->isEmpty()) 515 Class->setEmpty(false); 516 517 // C++ [class.virtual]p1: 518 // A class that [...] inherits a virtual function is called a polymorphic 519 // class. 520 if (BaseClass->isPolymorphic()) 521 Class->setPolymorphic(true); 522 523 // C++ [dcl.init.aggr]p1: 524 // An aggregate is [...] a class with [...] no base classes [...]. 525 Class->setAggregate(false); 526 527 // C++ [class]p4: 528 // A POD-struct is an aggregate class... 529 Class->setPOD(false); 530 531 if (BaseIsVirtual) { 532 // C++ [class.ctor]p5: 533 // A constructor is trivial if its class has no virtual base classes. 534 Class->setHasTrivialConstructor(false); 535 536 // C++ [class.copy]p6: 537 // A copy constructor is trivial if its class has no virtual base classes. 538 Class->setHasTrivialCopyConstructor(false); 539 540 // C++ [class.copy]p11: 541 // A copy assignment operator is trivial if its class has no virtual 542 // base classes. 543 Class->setHasTrivialCopyAssignment(false); 544 545 // C++0x [meta.unary.prop] is_empty: 546 // T is a class type, but not a union type, with ... no virtual base 547 // classes 548 Class->setEmpty(false); 549 } else { 550 // C++ [class.ctor]p5: 551 // A constructor is trivial if all the direct base classes of its 552 // class have trivial constructors. 553 if (!BaseClass->hasTrivialConstructor()) 554 Class->setHasTrivialConstructor(false); 555 556 // C++ [class.copy]p6: 557 // A copy constructor is trivial if all the direct base classes of its 558 // class have trivial copy constructors. 559 if (!BaseClass->hasTrivialCopyConstructor()) 560 Class->setHasTrivialCopyConstructor(false); 561 562 // C++ [class.copy]p11: 563 // A copy assignment operator is trivial if all the direct base classes 564 // of its class have trivial copy assignment operators. 565 if (!BaseClass->hasTrivialCopyAssignment()) 566 Class->setHasTrivialCopyAssignment(false); 567 } 568 569 // C++ [class.ctor]p3: 570 // A destructor is trivial if all the direct base classes of its class 571 // have trivial destructors. 572 if (!BaseClass->hasTrivialDestructor()) 573 Class->setHasTrivialDestructor(false); 574} 575 576/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 577/// one entry in the base class list of a class specifier, for 578/// example: 579/// class foo : public bar, virtual private baz { 580/// 'public bar' and 'virtual private baz' are each base-specifiers. 581Sema::BaseResult 582Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 583 bool Virtual, AccessSpecifier Access, 584 TypeTy *basetype, SourceLocation BaseLoc) { 585 if (!classdecl) 586 return true; 587 588 AdjustDeclIfTemplate(classdecl); 589 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 590 if (!Class) 591 return true; 592 593 QualType BaseType = GetTypeFromParser(basetype); 594 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 595 Virtual, Access, 596 BaseType, BaseLoc)) 597 return BaseSpec; 598 599 return true; 600} 601 602/// \brief Performs the actual work of attaching the given base class 603/// specifiers to a C++ class. 604bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 605 unsigned NumBases) { 606 if (NumBases == 0) 607 return false; 608 609 // Used to keep track of which base types we have already seen, so 610 // that we can properly diagnose redundant direct base types. Note 611 // that the key is always the unqualified canonical type of the base 612 // class. 613 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 614 615 // Copy non-redundant base specifiers into permanent storage. 616 unsigned NumGoodBases = 0; 617 bool Invalid = false; 618 for (unsigned idx = 0; idx < NumBases; ++idx) { 619 QualType NewBaseType 620 = Context.getCanonicalType(Bases[idx]->getType()); 621 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 622 623 if (KnownBaseTypes[NewBaseType]) { 624 // C++ [class.mi]p3: 625 // A class shall not be specified as a direct base class of a 626 // derived class more than once. 627 Diag(Bases[idx]->getSourceRange().getBegin(), 628 diag::err_duplicate_base_class) 629 << KnownBaseTypes[NewBaseType]->getType() 630 << Bases[idx]->getSourceRange(); 631 632 // Delete the duplicate base class specifier; we're going to 633 // overwrite its pointer later. 634 Context.Deallocate(Bases[idx]); 635 636 Invalid = true; 637 } else { 638 // Okay, add this new base class. 639 KnownBaseTypes[NewBaseType] = Bases[idx]; 640 Bases[NumGoodBases++] = Bases[idx]; 641 } 642 } 643 644 // Attach the remaining base class specifiers to the derived class. 645 Class->setBases(Bases, NumGoodBases); 646 647 // Delete the remaining (good) base class specifiers, since their 648 // data has been copied into the CXXRecordDecl. 649 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 650 Context.Deallocate(Bases[idx]); 651 652 return Invalid; 653} 654 655/// ActOnBaseSpecifiers - Attach the given base specifiers to the 656/// class, after checking whether there are any duplicate base 657/// classes. 658void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 659 unsigned NumBases) { 660 if (!ClassDecl || !Bases || !NumBases) 661 return; 662 663 AdjustDeclIfTemplate(ClassDecl); 664 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 665 (CXXBaseSpecifier**)(Bases), NumBases); 666} 667 668static CXXRecordDecl *GetClassForType(QualType T) { 669 if (const RecordType *RT = T->getAs<RecordType>()) 670 return cast<CXXRecordDecl>(RT->getDecl()); 671 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 672 return ICT->getDecl(); 673 else 674 return 0; 675} 676 677/// \brief Determine whether the type \p Derived is a C++ class that is 678/// derived from the type \p Base. 679bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 680 if (!getLangOptions().CPlusPlus) 681 return false; 682 683 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 684 if (!DerivedRD) 685 return false; 686 687 CXXRecordDecl *BaseRD = GetClassForType(Base); 688 if (!BaseRD) 689 return false; 690 691 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 692 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 693} 694 695/// \brief Determine whether the type \p Derived is a C++ class that is 696/// derived from the type \p Base. 697bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 698 if (!getLangOptions().CPlusPlus) 699 return false; 700 701 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 702 if (!DerivedRD) 703 return false; 704 705 CXXRecordDecl *BaseRD = GetClassForType(Base); 706 if (!BaseRD) 707 return false; 708 709 return DerivedRD->isDerivedFrom(BaseRD, Paths); 710} 711 712/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 713/// conversion (where Derived and Base are class types) is 714/// well-formed, meaning that the conversion is unambiguous (and 715/// that all of the base classes are accessible). Returns true 716/// and emits a diagnostic if the code is ill-formed, returns false 717/// otherwise. Loc is the location where this routine should point to 718/// if there is an error, and Range is the source range to highlight 719/// if there is an error. 720bool 721Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 722 AccessDiagnosticsKind ADK, 723 unsigned AmbigiousBaseConvID, 724 SourceLocation Loc, SourceRange Range, 725 DeclarationName Name) { 726 // First, determine whether the path from Derived to Base is 727 // ambiguous. This is slightly more expensive than checking whether 728 // the Derived to Base conversion exists, because here we need to 729 // explore multiple paths to determine if there is an ambiguity. 730 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 731 /*DetectVirtual=*/false); 732 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 733 assert(DerivationOkay && 734 "Can only be used with a derived-to-base conversion"); 735 (void)DerivationOkay; 736 737 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 738 if (ADK == ADK_quiet) 739 return false; 740 741 // Check that the base class can be accessed. 742 switch (CheckBaseClassAccess(Loc, /*IsBaseToDerived*/ false, 743 Base, Derived, Paths.front(), 744 /*force*/ false, 745 /*unprivileged*/ false, 746 ADK)) { 747 case AR_accessible: return false; 748 case AR_inaccessible: return true; 749 case AR_dependent: return false; 750 case AR_delayed: return false; 751 } 752 } 753 754 // We know that the derived-to-base conversion is ambiguous, and 755 // we're going to produce a diagnostic. Perform the derived-to-base 756 // search just one more time to compute all of the possible paths so 757 // that we can print them out. This is more expensive than any of 758 // the previous derived-to-base checks we've done, but at this point 759 // performance isn't as much of an issue. 760 Paths.clear(); 761 Paths.setRecordingPaths(true); 762 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 763 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 764 (void)StillOkay; 765 766 // Build up a textual representation of the ambiguous paths, e.g., 767 // D -> B -> A, that will be used to illustrate the ambiguous 768 // conversions in the diagnostic. We only print one of the paths 769 // to each base class subobject. 770 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 771 772 Diag(Loc, AmbigiousBaseConvID) 773 << Derived << Base << PathDisplayStr << Range << Name; 774 return true; 775} 776 777bool 778Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 779 SourceLocation Loc, SourceRange Range, 780 bool IgnoreAccess) { 781 return CheckDerivedToBaseConversion(Derived, Base, 782 IgnoreAccess ? ADK_quiet : ADK_normal, 783 diag::err_ambiguous_derived_to_base_conv, 784 Loc, Range, DeclarationName()); 785} 786 787 788/// @brief Builds a string representing ambiguous paths from a 789/// specific derived class to different subobjects of the same base 790/// class. 791/// 792/// This function builds a string that can be used in error messages 793/// to show the different paths that one can take through the 794/// inheritance hierarchy to go from the derived class to different 795/// subobjects of a base class. The result looks something like this: 796/// @code 797/// struct D -> struct B -> struct A 798/// struct D -> struct C -> struct A 799/// @endcode 800std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 801 std::string PathDisplayStr; 802 std::set<unsigned> DisplayedPaths; 803 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 804 Path != Paths.end(); ++Path) { 805 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 806 // We haven't displayed a path to this particular base 807 // class subobject yet. 808 PathDisplayStr += "\n "; 809 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 810 for (CXXBasePath::const_iterator Element = Path->begin(); 811 Element != Path->end(); ++Element) 812 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 813 } 814 } 815 816 return PathDisplayStr; 817} 818 819//===----------------------------------------------------------------------===// 820// C++ class member Handling 821//===----------------------------------------------------------------------===// 822 823/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 824/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 825/// bitfield width if there is one and 'InitExpr' specifies the initializer if 826/// any. 827Sema::DeclPtrTy 828Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 829 MultiTemplateParamsArg TemplateParameterLists, 830 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 831 bool Deleted) { 832 const DeclSpec &DS = D.getDeclSpec(); 833 DeclarationName Name = GetNameForDeclarator(D); 834 Expr *BitWidth = static_cast<Expr*>(BW); 835 Expr *Init = static_cast<Expr*>(InitExpr); 836 SourceLocation Loc = D.getIdentifierLoc(); 837 838 bool isFunc = D.isFunctionDeclarator(); 839 840 assert(!DS.isFriendSpecified()); 841 842 // C++ 9.2p6: A member shall not be declared to have automatic storage 843 // duration (auto, register) or with the extern storage-class-specifier. 844 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 845 // data members and cannot be applied to names declared const or static, 846 // and cannot be applied to reference members. 847 switch (DS.getStorageClassSpec()) { 848 case DeclSpec::SCS_unspecified: 849 case DeclSpec::SCS_typedef: 850 case DeclSpec::SCS_static: 851 // FALL THROUGH. 852 break; 853 case DeclSpec::SCS_mutable: 854 if (isFunc) { 855 if (DS.getStorageClassSpecLoc().isValid()) 856 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 857 else 858 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 859 860 // FIXME: It would be nicer if the keyword was ignored only for this 861 // declarator. Otherwise we could get follow-up errors. 862 D.getMutableDeclSpec().ClearStorageClassSpecs(); 863 } else { 864 QualType T = GetTypeForDeclarator(D, S); 865 diag::kind err = static_cast<diag::kind>(0); 866 if (T->isReferenceType()) 867 err = diag::err_mutable_reference; 868 else if (T.isConstQualified()) 869 err = diag::err_mutable_const; 870 if (err != 0) { 871 if (DS.getStorageClassSpecLoc().isValid()) 872 Diag(DS.getStorageClassSpecLoc(), err); 873 else 874 Diag(DS.getThreadSpecLoc(), err); 875 // FIXME: It would be nicer if the keyword was ignored only for this 876 // declarator. Otherwise we could get follow-up errors. 877 D.getMutableDeclSpec().ClearStorageClassSpecs(); 878 } 879 } 880 break; 881 default: 882 if (DS.getStorageClassSpecLoc().isValid()) 883 Diag(DS.getStorageClassSpecLoc(), 884 diag::err_storageclass_invalid_for_member); 885 else 886 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 887 D.getMutableDeclSpec().ClearStorageClassSpecs(); 888 } 889 890 if (!isFunc && 891 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 892 D.getNumTypeObjects() == 0) { 893 // Check also for this case: 894 // 895 // typedef int f(); 896 // f a; 897 // 898 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 899 isFunc = TDType->isFunctionType(); 900 } 901 902 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 903 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 904 !isFunc); 905 906 Decl *Member; 907 if (isInstField) { 908 // FIXME: Check for template parameters! 909 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 910 AS); 911 assert(Member && "HandleField never returns null"); 912 } else { 913 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 914 .getAs<Decl>(); 915 if (!Member) { 916 if (BitWidth) DeleteExpr(BitWidth); 917 return DeclPtrTy(); 918 } 919 920 // Non-instance-fields can't have a bitfield. 921 if (BitWidth) { 922 if (Member->isInvalidDecl()) { 923 // don't emit another diagnostic. 924 } else if (isa<VarDecl>(Member)) { 925 // C++ 9.6p3: A bit-field shall not be a static member. 926 // "static member 'A' cannot be a bit-field" 927 Diag(Loc, diag::err_static_not_bitfield) 928 << Name << BitWidth->getSourceRange(); 929 } else if (isa<TypedefDecl>(Member)) { 930 // "typedef member 'x' cannot be a bit-field" 931 Diag(Loc, diag::err_typedef_not_bitfield) 932 << Name << BitWidth->getSourceRange(); 933 } else { 934 // A function typedef ("typedef int f(); f a;"). 935 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 936 Diag(Loc, diag::err_not_integral_type_bitfield) 937 << Name << cast<ValueDecl>(Member)->getType() 938 << BitWidth->getSourceRange(); 939 } 940 941 DeleteExpr(BitWidth); 942 BitWidth = 0; 943 Member->setInvalidDecl(); 944 } 945 946 Member->setAccess(AS); 947 948 // If we have declared a member function template, set the access of the 949 // templated declaration as well. 950 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 951 FunTmpl->getTemplatedDecl()->setAccess(AS); 952 } 953 954 assert((Name || isInstField) && "No identifier for non-field ?"); 955 956 if (Init) 957 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 958 if (Deleted) // FIXME: Source location is not very good. 959 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 960 961 if (isInstField) { 962 FieldCollector->Add(cast<FieldDecl>(Member)); 963 return DeclPtrTy(); 964 } 965 return DeclPtrTy::make(Member); 966} 967 968/// \brief Find the direct and/or virtual base specifiers that 969/// correspond to the given base type, for use in base initialization 970/// within a constructor. 971static bool FindBaseInitializer(Sema &SemaRef, 972 CXXRecordDecl *ClassDecl, 973 QualType BaseType, 974 const CXXBaseSpecifier *&DirectBaseSpec, 975 const CXXBaseSpecifier *&VirtualBaseSpec) { 976 // First, check for a direct base class. 977 DirectBaseSpec = 0; 978 for (CXXRecordDecl::base_class_const_iterator Base 979 = ClassDecl->bases_begin(); 980 Base != ClassDecl->bases_end(); ++Base) { 981 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 982 // We found a direct base of this type. That's what we're 983 // initializing. 984 DirectBaseSpec = &*Base; 985 break; 986 } 987 } 988 989 // Check for a virtual base class. 990 // FIXME: We might be able to short-circuit this if we know in advance that 991 // there are no virtual bases. 992 VirtualBaseSpec = 0; 993 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 994 // We haven't found a base yet; search the class hierarchy for a 995 // virtual base class. 996 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 997 /*DetectVirtual=*/false); 998 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 999 BaseType, Paths)) { 1000 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1001 Path != Paths.end(); ++Path) { 1002 if (Path->back().Base->isVirtual()) { 1003 VirtualBaseSpec = Path->back().Base; 1004 break; 1005 } 1006 } 1007 } 1008 } 1009 1010 return DirectBaseSpec || VirtualBaseSpec; 1011} 1012 1013/// ActOnMemInitializer - Handle a C++ member initializer. 1014Sema::MemInitResult 1015Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1016 Scope *S, 1017 const CXXScopeSpec &SS, 1018 IdentifierInfo *MemberOrBase, 1019 TypeTy *TemplateTypeTy, 1020 SourceLocation IdLoc, 1021 SourceLocation LParenLoc, 1022 ExprTy **Args, unsigned NumArgs, 1023 SourceLocation *CommaLocs, 1024 SourceLocation RParenLoc) { 1025 if (!ConstructorD) 1026 return true; 1027 1028 AdjustDeclIfTemplate(ConstructorD); 1029 1030 CXXConstructorDecl *Constructor 1031 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1032 if (!Constructor) { 1033 // The user wrote a constructor initializer on a function that is 1034 // not a C++ constructor. Ignore the error for now, because we may 1035 // have more member initializers coming; we'll diagnose it just 1036 // once in ActOnMemInitializers. 1037 return true; 1038 } 1039 1040 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1041 1042 // C++ [class.base.init]p2: 1043 // Names in a mem-initializer-id are looked up in the scope of the 1044 // constructor���s class and, if not found in that scope, are looked 1045 // up in the scope containing the constructor���s 1046 // definition. [Note: if the constructor���s class contains a member 1047 // with the same name as a direct or virtual base class of the 1048 // class, a mem-initializer-id naming the member or base class and 1049 // composed of a single identifier refers to the class member. A 1050 // mem-initializer-id for the hidden base class may be specified 1051 // using a qualified name. ] 1052 if (!SS.getScopeRep() && !TemplateTypeTy) { 1053 // Look for a member, first. 1054 FieldDecl *Member = 0; 1055 DeclContext::lookup_result Result 1056 = ClassDecl->lookup(MemberOrBase); 1057 if (Result.first != Result.second) 1058 Member = dyn_cast<FieldDecl>(*Result.first); 1059 1060 // FIXME: Handle members of an anonymous union. 1061 1062 if (Member) 1063 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1064 LParenLoc, RParenLoc); 1065 } 1066 // It didn't name a member, so see if it names a class. 1067 QualType BaseType; 1068 TypeSourceInfo *TInfo = 0; 1069 1070 if (TemplateTypeTy) { 1071 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1072 } else { 1073 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1074 LookupParsedName(R, S, &SS); 1075 1076 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1077 if (!TyD) { 1078 if (R.isAmbiguous()) return true; 1079 1080 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1081 bool NotUnknownSpecialization = false; 1082 DeclContext *DC = computeDeclContext(SS, false); 1083 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1084 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1085 1086 if (!NotUnknownSpecialization) { 1087 // When the scope specifier can refer to a member of an unknown 1088 // specialization, we take it as a type name. 1089 BaseType = CheckTypenameType((NestedNameSpecifier *)SS.getScopeRep(), 1090 *MemberOrBase, SS.getRange()); 1091 if (BaseType.isNull()) 1092 return true; 1093 1094 R.clear(); 1095 } 1096 } 1097 1098 // If no results were found, try to correct typos. 1099 if (R.empty() && BaseType.isNull() && 1100 CorrectTypo(R, S, &SS, ClassDecl) && R.isSingleResult()) { 1101 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1102 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1103 // We have found a non-static data member with a similar 1104 // name to what was typed; complain and initialize that 1105 // member. 1106 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1107 << MemberOrBase << true << R.getLookupName() 1108 << CodeModificationHint::CreateReplacement(R.getNameLoc(), 1109 R.getLookupName().getAsString()); 1110 Diag(Member->getLocation(), diag::note_previous_decl) 1111 << Member->getDeclName(); 1112 1113 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1114 LParenLoc, RParenLoc); 1115 } 1116 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1117 const CXXBaseSpecifier *DirectBaseSpec; 1118 const CXXBaseSpecifier *VirtualBaseSpec; 1119 if (FindBaseInitializer(*this, ClassDecl, 1120 Context.getTypeDeclType(Type), 1121 DirectBaseSpec, VirtualBaseSpec)) { 1122 // We have found a direct or virtual base class with a 1123 // similar name to what was typed; complain and initialize 1124 // that base class. 1125 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1126 << MemberOrBase << false << R.getLookupName() 1127 << CodeModificationHint::CreateReplacement(R.getNameLoc(), 1128 R.getLookupName().getAsString()); 1129 1130 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1131 : VirtualBaseSpec; 1132 Diag(BaseSpec->getSourceRange().getBegin(), 1133 diag::note_base_class_specified_here) 1134 << BaseSpec->getType() 1135 << BaseSpec->getSourceRange(); 1136 1137 TyD = Type; 1138 } 1139 } 1140 } 1141 1142 if (!TyD && BaseType.isNull()) { 1143 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1144 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1145 return true; 1146 } 1147 } 1148 1149 if (BaseType.isNull()) { 1150 BaseType = Context.getTypeDeclType(TyD); 1151 if (SS.isSet()) { 1152 NestedNameSpecifier *Qualifier = 1153 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1154 1155 // FIXME: preserve source range information 1156 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1157 } 1158 } 1159 } 1160 1161 if (!TInfo) 1162 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1163 1164 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1165 LParenLoc, RParenLoc, ClassDecl); 1166} 1167 1168/// Checks an initializer expression for use of uninitialized fields, such as 1169/// containing the field that is being initialized. Returns true if there is an 1170/// uninitialized field was used an updates the SourceLocation parameter; false 1171/// otherwise. 1172static bool InitExprContainsUninitializedFields(const Stmt* S, 1173 const FieldDecl* LhsField, 1174 SourceLocation* L) { 1175 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1176 if (ME) { 1177 const NamedDecl* RhsField = ME->getMemberDecl(); 1178 if (RhsField == LhsField) { 1179 // Initializing a field with itself. Throw a warning. 1180 // But wait; there are exceptions! 1181 // Exception #1: The field may not belong to this record. 1182 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1183 const Expr* base = ME->getBase(); 1184 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1185 // Even though the field matches, it does not belong to this record. 1186 return false; 1187 } 1188 // None of the exceptions triggered; return true to indicate an 1189 // uninitialized field was used. 1190 *L = ME->getMemberLoc(); 1191 return true; 1192 } 1193 } 1194 bool found = false; 1195 for (Stmt::const_child_iterator it = S->child_begin(); 1196 it != S->child_end() && found == false; 1197 ++it) { 1198 if (isa<CallExpr>(S)) { 1199 // Do not descend into function calls or constructors, as the use 1200 // of an uninitialized field may be valid. One would have to inspect 1201 // the contents of the function/ctor to determine if it is safe or not. 1202 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1203 // may be safe, depending on what the function/ctor does. 1204 continue; 1205 } 1206 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1207 } 1208 return found; 1209} 1210 1211Sema::MemInitResult 1212Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1213 unsigned NumArgs, SourceLocation IdLoc, 1214 SourceLocation LParenLoc, 1215 SourceLocation RParenLoc) { 1216 // Diagnose value-uses of fields to initialize themselves, e.g. 1217 // foo(foo) 1218 // where foo is not also a parameter to the constructor. 1219 // TODO: implement -Wuninitialized and fold this into that framework. 1220 for (unsigned i = 0; i < NumArgs; ++i) { 1221 SourceLocation L; 1222 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1223 // FIXME: Return true in the case when other fields are used before being 1224 // uninitialized. For example, let this field be the i'th field. When 1225 // initializing the i'th field, throw a warning if any of the >= i'th 1226 // fields are used, as they are not yet initialized. 1227 // Right now we are only handling the case where the i'th field uses 1228 // itself in its initializer. 1229 Diag(L, diag::warn_field_is_uninit); 1230 } 1231 } 1232 1233 bool HasDependentArg = false; 1234 for (unsigned i = 0; i < NumArgs; i++) 1235 HasDependentArg |= Args[i]->isTypeDependent(); 1236 1237 QualType FieldType = Member->getType(); 1238 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1239 FieldType = Array->getElementType(); 1240 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1241 if (FieldType->isDependentType() || HasDependentArg) { 1242 // Can't check initialization for a member of dependent type or when 1243 // any of the arguments are type-dependent expressions. 1244 OwningExprResult Init 1245 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1246 RParenLoc)); 1247 1248 // Erase any temporaries within this evaluation context; we're not 1249 // going to track them in the AST, since we'll be rebuilding the 1250 // ASTs during template instantiation. 1251 ExprTemporaries.erase( 1252 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1253 ExprTemporaries.end()); 1254 1255 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1256 LParenLoc, 1257 Init.takeAs<Expr>(), 1258 RParenLoc); 1259 1260 } 1261 1262 if (Member->isInvalidDecl()) 1263 return true; 1264 1265 // Initialize the member. 1266 InitializedEntity MemberEntity = 1267 InitializedEntity::InitializeMember(Member, 0); 1268 InitializationKind Kind = 1269 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1270 1271 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1272 1273 OwningExprResult MemberInit = 1274 InitSeq.Perform(*this, MemberEntity, Kind, 1275 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1276 if (MemberInit.isInvalid()) 1277 return true; 1278 1279 // C++0x [class.base.init]p7: 1280 // The initialization of each base and member constitutes a 1281 // full-expression. 1282 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1283 if (MemberInit.isInvalid()) 1284 return true; 1285 1286 // If we are in a dependent context, template instantiation will 1287 // perform this type-checking again. Just save the arguments that we 1288 // received in a ParenListExpr. 1289 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1290 // of the information that we have about the member 1291 // initializer. However, deconstructing the ASTs is a dicey process, 1292 // and this approach is far more likely to get the corner cases right. 1293 if (CurContext->isDependentContext()) { 1294 // Bump the reference count of all of the arguments. 1295 for (unsigned I = 0; I != NumArgs; ++I) 1296 Args[I]->Retain(); 1297 1298 OwningExprResult Init 1299 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1300 RParenLoc)); 1301 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1302 LParenLoc, 1303 Init.takeAs<Expr>(), 1304 RParenLoc); 1305 } 1306 1307 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1308 LParenLoc, 1309 MemberInit.takeAs<Expr>(), 1310 RParenLoc); 1311} 1312 1313Sema::MemInitResult 1314Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1315 Expr **Args, unsigned NumArgs, 1316 SourceLocation LParenLoc, SourceLocation RParenLoc, 1317 CXXRecordDecl *ClassDecl) { 1318 bool HasDependentArg = false; 1319 for (unsigned i = 0; i < NumArgs; i++) 1320 HasDependentArg |= Args[i]->isTypeDependent(); 1321 1322 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1323 if (BaseType->isDependentType() || HasDependentArg) { 1324 // Can't check initialization for a base of dependent type or when 1325 // any of the arguments are type-dependent expressions. 1326 OwningExprResult BaseInit 1327 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1328 RParenLoc)); 1329 1330 // Erase any temporaries within this evaluation context; we're not 1331 // going to track them in the AST, since we'll be rebuilding the 1332 // ASTs during template instantiation. 1333 ExprTemporaries.erase( 1334 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1335 ExprTemporaries.end()); 1336 1337 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1338 LParenLoc, 1339 BaseInit.takeAs<Expr>(), 1340 RParenLoc); 1341 } 1342 1343 if (!BaseType->isRecordType()) 1344 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1345 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1346 1347 // C++ [class.base.init]p2: 1348 // [...] Unless the mem-initializer-id names a nonstatic data 1349 // member of the constructor���s class or a direct or virtual base 1350 // of that class, the mem-initializer is ill-formed. A 1351 // mem-initializer-list can initialize a base class using any 1352 // name that denotes that base class type. 1353 1354 // Check for direct and virtual base classes. 1355 const CXXBaseSpecifier *DirectBaseSpec = 0; 1356 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1357 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1358 VirtualBaseSpec); 1359 1360 // C++ [base.class.init]p2: 1361 // If a mem-initializer-id is ambiguous because it designates both 1362 // a direct non-virtual base class and an inherited virtual base 1363 // class, the mem-initializer is ill-formed. 1364 if (DirectBaseSpec && VirtualBaseSpec) 1365 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1366 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1367 // C++ [base.class.init]p2: 1368 // Unless the mem-initializer-id names a nonstatic data membeer of the 1369 // constructor's class ot a direst or virtual base of that class, the 1370 // mem-initializer is ill-formed. 1371 if (!DirectBaseSpec && !VirtualBaseSpec) 1372 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1373 << BaseType << ClassDecl->getNameAsCString() 1374 << BaseTInfo->getTypeLoc().getSourceRange(); 1375 1376 CXXBaseSpecifier *BaseSpec 1377 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1378 if (!BaseSpec) 1379 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1380 1381 // Initialize the base. 1382 InitializedEntity BaseEntity = 1383 InitializedEntity::InitializeBase(Context, BaseSpec); 1384 InitializationKind Kind = 1385 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1386 1387 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1388 1389 OwningExprResult BaseInit = 1390 InitSeq.Perform(*this, BaseEntity, Kind, 1391 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1392 if (BaseInit.isInvalid()) 1393 return true; 1394 1395 // C++0x [class.base.init]p7: 1396 // The initialization of each base and member constitutes a 1397 // full-expression. 1398 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1399 if (BaseInit.isInvalid()) 1400 return true; 1401 1402 // If we are in a dependent context, template instantiation will 1403 // perform this type-checking again. Just save the arguments that we 1404 // received in a ParenListExpr. 1405 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1406 // of the information that we have about the base 1407 // initializer. However, deconstructing the ASTs is a dicey process, 1408 // and this approach is far more likely to get the corner cases right. 1409 if (CurContext->isDependentContext()) { 1410 // Bump the reference count of all of the arguments. 1411 for (unsigned I = 0; I != NumArgs; ++I) 1412 Args[I]->Retain(); 1413 1414 OwningExprResult Init 1415 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1416 RParenLoc)); 1417 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1418 LParenLoc, 1419 Init.takeAs<Expr>(), 1420 RParenLoc); 1421 } 1422 1423 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1424 LParenLoc, 1425 BaseInit.takeAs<Expr>(), 1426 RParenLoc); 1427} 1428 1429bool 1430Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1431 CXXBaseOrMemberInitializer **Initializers, 1432 unsigned NumInitializers, 1433 bool IsImplicitConstructor, 1434 bool AnyErrors) { 1435 // We need to build the initializer AST according to order of construction 1436 // and not what user specified in the Initializers list. 1437 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1438 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1439 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1440 bool HasDependentBaseInit = false; 1441 bool HadError = false; 1442 1443 for (unsigned i = 0; i < NumInitializers; i++) { 1444 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1445 if (Member->isBaseInitializer()) { 1446 if (Member->getBaseClass()->isDependentType()) 1447 HasDependentBaseInit = true; 1448 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1449 } else { 1450 AllBaseFields[Member->getMember()] = Member; 1451 } 1452 } 1453 1454 if (HasDependentBaseInit) { 1455 // FIXME. This does not preserve the ordering of the initializers. 1456 // Try (with -Wreorder) 1457 // template<class X> struct A {}; 1458 // template<class X> struct B : A<X> { 1459 // B() : x1(10), A<X>() {} 1460 // int x1; 1461 // }; 1462 // B<int> x; 1463 // On seeing one dependent type, we should essentially exit this routine 1464 // while preserving user-declared initializer list. When this routine is 1465 // called during instantiatiation process, this routine will rebuild the 1466 // ordered initializer list correctly. 1467 1468 // If we have a dependent base initialization, we can't determine the 1469 // association between initializers and bases; just dump the known 1470 // initializers into the list, and don't try to deal with other bases. 1471 for (unsigned i = 0; i < NumInitializers; i++) { 1472 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1473 if (Member->isBaseInitializer()) 1474 AllToInit.push_back(Member); 1475 } 1476 } else { 1477 llvm::SmallVector<CXXBaseSpecifier *, 4> BasesToDefaultInit; 1478 1479 // Push virtual bases before others. 1480 for (CXXRecordDecl::base_class_iterator VBase = 1481 ClassDecl->vbases_begin(), 1482 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1483 if (VBase->getType()->isDependentType()) 1484 continue; 1485 if (CXXBaseOrMemberInitializer *Value 1486 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1487 AllToInit.push_back(Value); 1488 } else if (!AnyErrors) { 1489 InitializedEntity InitEntity 1490 = InitializedEntity::InitializeBase(Context, VBase); 1491 InitializationKind InitKind 1492 = InitializationKind::CreateDefault(Constructor->getLocation()); 1493 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1494 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1495 MultiExprArg(*this, 0, 0)); 1496 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1497 if (BaseInit.isInvalid()) { 1498 HadError = true; 1499 continue; 1500 } 1501 1502 // Don't attach synthesized base initializers in a dependent 1503 // context; they'll be checked again at template instantiation 1504 // time. 1505 if (CurContext->isDependentContext()) 1506 continue; 1507 1508 CXXBaseOrMemberInitializer *CXXBaseInit = 1509 new (Context) CXXBaseOrMemberInitializer(Context, 1510 Context.getTrivialTypeSourceInfo(VBase->getType(), 1511 SourceLocation()), 1512 SourceLocation(), 1513 BaseInit.takeAs<Expr>(), 1514 SourceLocation()); 1515 AllToInit.push_back(CXXBaseInit); 1516 } 1517 } 1518 1519 for (CXXRecordDecl::base_class_iterator Base = 1520 ClassDecl->bases_begin(), 1521 E = ClassDecl->bases_end(); Base != E; ++Base) { 1522 // Virtuals are in the virtual base list and already constructed. 1523 if (Base->isVirtual()) 1524 continue; 1525 // Skip dependent types. 1526 if (Base->getType()->isDependentType()) 1527 continue; 1528 if (CXXBaseOrMemberInitializer *Value 1529 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1530 AllToInit.push_back(Value); 1531 } 1532 else if (!AnyErrors) { 1533 InitializedEntity InitEntity 1534 = InitializedEntity::InitializeBase(Context, Base); 1535 InitializationKind InitKind 1536 = InitializationKind::CreateDefault(Constructor->getLocation()); 1537 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1538 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1539 MultiExprArg(*this, 0, 0)); 1540 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1541 if (BaseInit.isInvalid()) { 1542 HadError = true; 1543 continue; 1544 } 1545 1546 // Don't attach synthesized base initializers in a dependent 1547 // context; they'll be regenerated at template instantiation 1548 // time. 1549 if (CurContext->isDependentContext()) 1550 continue; 1551 1552 CXXBaseOrMemberInitializer *CXXBaseInit = 1553 new (Context) CXXBaseOrMemberInitializer(Context, 1554 Context.getTrivialTypeSourceInfo(Base->getType(), 1555 SourceLocation()), 1556 SourceLocation(), 1557 BaseInit.takeAs<Expr>(), 1558 SourceLocation()); 1559 AllToInit.push_back(CXXBaseInit); 1560 } 1561 } 1562 } 1563 1564 // non-static data members. 1565 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1566 E = ClassDecl->field_end(); Field != E; ++Field) { 1567 if ((*Field)->isAnonymousStructOrUnion()) { 1568 if (const RecordType *FieldClassType = 1569 Field->getType()->getAs<RecordType>()) { 1570 CXXRecordDecl *FieldClassDecl 1571 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1572 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1573 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1574 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1575 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1576 // set to the anonymous union data member used in the initializer 1577 // list. 1578 Value->setMember(*Field); 1579 Value->setAnonUnionMember(*FA); 1580 AllToInit.push_back(Value); 1581 break; 1582 } 1583 } 1584 } 1585 continue; 1586 } 1587 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1588 AllToInit.push_back(Value); 1589 continue; 1590 } 1591 1592 if ((*Field)->getType()->isDependentType() || AnyErrors) 1593 continue; 1594 1595 QualType FT = Context.getBaseElementType((*Field)->getType()); 1596 if (FT->getAs<RecordType>()) { 1597 InitializedEntity InitEntity 1598 = InitializedEntity::InitializeMember(*Field); 1599 InitializationKind InitKind 1600 = InitializationKind::CreateDefault(Constructor->getLocation()); 1601 1602 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1603 OwningExprResult MemberInit = InitSeq.Perform(*this, InitEntity, InitKind, 1604 MultiExprArg(*this, 0, 0)); 1605 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1606 if (MemberInit.isInvalid()) { 1607 HadError = true; 1608 continue; 1609 } 1610 1611 // Don't attach synthesized member initializers in a dependent 1612 // context; they'll be regenerated a template instantiation 1613 // time. 1614 if (CurContext->isDependentContext()) 1615 continue; 1616 1617 CXXBaseOrMemberInitializer *Member = 1618 new (Context) CXXBaseOrMemberInitializer(Context, 1619 *Field, SourceLocation(), 1620 SourceLocation(), 1621 MemberInit.takeAs<Expr>(), 1622 SourceLocation()); 1623 1624 AllToInit.push_back(Member); 1625 } 1626 else if (FT->isReferenceType()) { 1627 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1628 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1629 << 0 << (*Field)->getDeclName(); 1630 Diag((*Field)->getLocation(), diag::note_declared_at); 1631 HadError = true; 1632 } 1633 else if (FT.isConstQualified()) { 1634 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1635 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1636 << 1 << (*Field)->getDeclName(); 1637 Diag((*Field)->getLocation(), diag::note_declared_at); 1638 HadError = true; 1639 } 1640 } 1641 1642 NumInitializers = AllToInit.size(); 1643 if (NumInitializers > 0) { 1644 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1645 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1646 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1647 1648 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1649 for (unsigned Idx = 0; Idx < NumInitializers; ++Idx) { 1650 CXXBaseOrMemberInitializer *Member = AllToInit[Idx]; 1651 baseOrMemberInitializers[Idx] = Member; 1652 if (!Member->isBaseInitializer()) 1653 continue; 1654 const Type *BaseType = Member->getBaseClass(); 1655 const RecordType *RT = BaseType->getAs<RecordType>(); 1656 if (!RT) 1657 continue; 1658 CXXRecordDecl *BaseClassDecl = 1659 cast<CXXRecordDecl>(RT->getDecl()); 1660 if (BaseClassDecl->hasTrivialDestructor()) 1661 continue; 1662 CXXDestructorDecl *DD = BaseClassDecl->getDestructor(Context); 1663 MarkDeclarationReferenced(Constructor->getLocation(), DD); 1664 } 1665 } 1666 1667 return HadError; 1668} 1669 1670static void *GetKeyForTopLevelField(FieldDecl *Field) { 1671 // For anonymous unions, use the class declaration as the key. 1672 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1673 if (RT->getDecl()->isAnonymousStructOrUnion()) 1674 return static_cast<void *>(RT->getDecl()); 1675 } 1676 return static_cast<void *>(Field); 1677} 1678 1679static void *GetKeyForBase(QualType BaseType) { 1680 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1681 return (void *)RT; 1682 1683 assert(0 && "Unexpected base type!"); 1684 return 0; 1685} 1686 1687static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1688 bool MemberMaybeAnon = false) { 1689 // For fields injected into the class via declaration of an anonymous union, 1690 // use its anonymous union class declaration as the unique key. 1691 if (Member->isMemberInitializer()) { 1692 FieldDecl *Field = Member->getMember(); 1693 1694 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1695 // data member of the class. Data member used in the initializer list is 1696 // in AnonUnionMember field. 1697 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1698 Field = Member->getAnonUnionMember(); 1699 if (Field->getDeclContext()->isRecord()) { 1700 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 1701 if (RD->isAnonymousStructOrUnion()) 1702 return static_cast<void *>(RD); 1703 } 1704 return static_cast<void *>(Field); 1705 } 1706 1707 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1708} 1709 1710/// ActOnMemInitializers - Handle the member initializers for a constructor. 1711void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1712 SourceLocation ColonLoc, 1713 MemInitTy **MemInits, unsigned NumMemInits, 1714 bool AnyErrors) { 1715 if (!ConstructorDecl) 1716 return; 1717 1718 AdjustDeclIfTemplate(ConstructorDecl); 1719 1720 CXXConstructorDecl *Constructor 1721 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1722 1723 if (!Constructor) { 1724 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1725 return; 1726 } 1727 1728 if (!Constructor->isDependentContext()) { 1729 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 1730 bool err = false; 1731 for (unsigned i = 0; i < NumMemInits; i++) { 1732 CXXBaseOrMemberInitializer *Member = 1733 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1734 void *KeyToMember = GetKeyForMember(Member); 1735 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1736 if (!PrevMember) { 1737 PrevMember = Member; 1738 continue; 1739 } 1740 if (FieldDecl *Field = Member->getMember()) 1741 Diag(Member->getSourceLocation(), 1742 diag::error_multiple_mem_initialization) 1743 << Field->getNameAsString() 1744 << Member->getSourceRange(); 1745 else { 1746 Type *BaseClass = Member->getBaseClass(); 1747 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1748 Diag(Member->getSourceLocation(), 1749 diag::error_multiple_base_initialization) 1750 << QualType(BaseClass, 0) 1751 << Member->getSourceRange(); 1752 } 1753 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1754 << 0; 1755 err = true; 1756 } 1757 1758 if (err) 1759 return; 1760 } 1761 1762 SetBaseOrMemberInitializers(Constructor, 1763 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 1764 NumMemInits, false, AnyErrors); 1765 1766 if (Constructor->isDependentContext()) 1767 return; 1768 1769 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1770 Diagnostic::Ignored && 1771 Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1772 Diagnostic::Ignored) 1773 return; 1774 1775 // Also issue warning if order of ctor-initializer list does not match order 1776 // of 1) base class declarations and 2) order of non-static data members. 1777 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1778 1779 CXXRecordDecl *ClassDecl 1780 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1781 // Push virtual bases before others. 1782 for (CXXRecordDecl::base_class_iterator VBase = 1783 ClassDecl->vbases_begin(), 1784 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1785 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1786 1787 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1788 E = ClassDecl->bases_end(); Base != E; ++Base) { 1789 // Virtuals are alread in the virtual base list and are constructed 1790 // first. 1791 if (Base->isVirtual()) 1792 continue; 1793 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1794 } 1795 1796 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1797 E = ClassDecl->field_end(); Field != E; ++Field) 1798 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1799 1800 int Last = AllBaseOrMembers.size(); 1801 int curIndex = 0; 1802 CXXBaseOrMemberInitializer *PrevMember = 0; 1803 for (unsigned i = 0; i < NumMemInits; i++) { 1804 CXXBaseOrMemberInitializer *Member = 1805 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1806 void *MemberInCtorList = GetKeyForMember(Member, true); 1807 1808 for (; curIndex < Last; curIndex++) 1809 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1810 break; 1811 if (curIndex == Last) { 1812 assert(PrevMember && "Member not in member list?!"); 1813 // Initializer as specified in ctor-initializer list is out of order. 1814 // Issue a warning diagnostic. 1815 if (PrevMember->isBaseInitializer()) { 1816 // Diagnostics is for an initialized base class. 1817 Type *BaseClass = PrevMember->getBaseClass(); 1818 Diag(PrevMember->getSourceLocation(), 1819 diag::warn_base_initialized) 1820 << QualType(BaseClass, 0); 1821 } else { 1822 FieldDecl *Field = PrevMember->getMember(); 1823 Diag(PrevMember->getSourceLocation(), 1824 diag::warn_field_initialized) 1825 << Field->getNameAsString(); 1826 } 1827 // Also the note! 1828 if (FieldDecl *Field = Member->getMember()) 1829 Diag(Member->getSourceLocation(), 1830 diag::note_fieldorbase_initialized_here) << 0 1831 << Field->getNameAsString(); 1832 else { 1833 Type *BaseClass = Member->getBaseClass(); 1834 Diag(Member->getSourceLocation(), 1835 diag::note_fieldorbase_initialized_here) << 1 1836 << QualType(BaseClass, 0); 1837 } 1838 for (curIndex = 0; curIndex < Last; curIndex++) 1839 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1840 break; 1841 } 1842 PrevMember = Member; 1843 } 1844} 1845 1846void 1847Sema::MarkBaseAndMemberDestructorsReferenced(CXXDestructorDecl *Destructor) { 1848 // Ignore dependent destructors. 1849 if (Destructor->isDependentContext()) 1850 return; 1851 1852 CXXRecordDecl *ClassDecl = Destructor->getParent(); 1853 1854 // Non-static data members. 1855 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1856 E = ClassDecl->field_end(); I != E; ++I) { 1857 FieldDecl *Field = *I; 1858 1859 QualType FieldType = Context.getBaseElementType(Field->getType()); 1860 1861 const RecordType* RT = FieldType->getAs<RecordType>(); 1862 if (!RT) 1863 continue; 1864 1865 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1866 if (FieldClassDecl->hasTrivialDestructor()) 1867 continue; 1868 1869 const CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1870 MarkDeclarationReferenced(Destructor->getLocation(), 1871 const_cast<CXXDestructorDecl*>(Dtor)); 1872 } 1873 1874 // Bases. 1875 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1876 E = ClassDecl->bases_end(); Base != E; ++Base) { 1877 // Ignore virtual bases. 1878 if (Base->isVirtual()) 1879 continue; 1880 1881 // Ignore trivial destructors. 1882 CXXRecordDecl *BaseClassDecl 1883 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1884 if (BaseClassDecl->hasTrivialDestructor()) 1885 continue; 1886 1887 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1888 MarkDeclarationReferenced(Destructor->getLocation(), 1889 const_cast<CXXDestructorDecl*>(Dtor)); 1890 } 1891 1892 // Virtual bases. 1893 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1894 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1895 // Ignore trivial destructors. 1896 CXXRecordDecl *BaseClassDecl 1897 = cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1898 if (BaseClassDecl->hasTrivialDestructor()) 1899 continue; 1900 1901 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1902 MarkDeclarationReferenced(Destructor->getLocation(), 1903 const_cast<CXXDestructorDecl*>(Dtor)); 1904 } 1905} 1906 1907void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1908 if (!CDtorDecl) 1909 return; 1910 1911 AdjustDeclIfTemplate(CDtorDecl); 1912 1913 if (CXXConstructorDecl *Constructor 1914 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1915 SetBaseOrMemberInitializers(Constructor, 0, 0, false, false); 1916} 1917 1918namespace { 1919 /// PureVirtualMethodCollector - traverses a class and its superclasses 1920 /// and determines if it has any pure virtual methods. 1921 class PureVirtualMethodCollector { 1922 ASTContext &Context; 1923 1924 public: 1925 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1926 1927 private: 1928 MethodList Methods; 1929 1930 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1931 1932 public: 1933 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1934 : Context(Ctx) { 1935 1936 MethodList List; 1937 Collect(RD, List); 1938 1939 // Copy the temporary list to methods, and make sure to ignore any 1940 // null entries. 1941 for (size_t i = 0, e = List.size(); i != e; ++i) { 1942 if (List[i]) 1943 Methods.push_back(List[i]); 1944 } 1945 } 1946 1947 bool empty() const { return Methods.empty(); } 1948 1949 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1950 MethodList::const_iterator methods_end() { return Methods.end(); } 1951 }; 1952 1953 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1954 MethodList& Methods) { 1955 // First, collect the pure virtual methods for the base classes. 1956 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1957 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1958 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1959 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1960 if (BaseDecl && BaseDecl->isAbstract()) 1961 Collect(BaseDecl, Methods); 1962 } 1963 } 1964 1965 // Next, zero out any pure virtual methods that this class overrides. 1966 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1967 1968 MethodSetTy OverriddenMethods; 1969 size_t MethodsSize = Methods.size(); 1970 1971 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1972 i != e; ++i) { 1973 // Traverse the record, looking for methods. 1974 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1975 // If the method is pure virtual, add it to the methods vector. 1976 if (MD->isPure()) 1977 Methods.push_back(MD); 1978 1979 // Record all the overridden methods in our set. 1980 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1981 E = MD->end_overridden_methods(); I != E; ++I) { 1982 // Keep track of the overridden methods. 1983 OverriddenMethods.insert(*I); 1984 } 1985 } 1986 } 1987 1988 // Now go through the methods and zero out all the ones we know are 1989 // overridden. 1990 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1991 if (OverriddenMethods.count(Methods[i])) 1992 Methods[i] = 0; 1993 } 1994 1995 } 1996} 1997 1998 1999bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2000 unsigned DiagID, AbstractDiagSelID SelID, 2001 const CXXRecordDecl *CurrentRD) { 2002 if (SelID == -1) 2003 return RequireNonAbstractType(Loc, T, 2004 PDiag(DiagID), CurrentRD); 2005 else 2006 return RequireNonAbstractType(Loc, T, 2007 PDiag(DiagID) << SelID, CurrentRD); 2008} 2009 2010bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2011 const PartialDiagnostic &PD, 2012 const CXXRecordDecl *CurrentRD) { 2013 if (!getLangOptions().CPlusPlus) 2014 return false; 2015 2016 if (const ArrayType *AT = Context.getAsArrayType(T)) 2017 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2018 CurrentRD); 2019 2020 if (const PointerType *PT = T->getAs<PointerType>()) { 2021 // Find the innermost pointer type. 2022 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2023 PT = T; 2024 2025 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2026 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2027 } 2028 2029 const RecordType *RT = T->getAs<RecordType>(); 2030 if (!RT) 2031 return false; 2032 2033 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2034 2035 if (CurrentRD && CurrentRD != RD) 2036 return false; 2037 2038 // FIXME: is this reasonable? It matches current behavior, but.... 2039 if (!RD->getDefinition()) 2040 return false; 2041 2042 if (!RD->isAbstract()) 2043 return false; 2044 2045 Diag(Loc, PD) << RD->getDeclName(); 2046 2047 // Check if we've already emitted the list of pure virtual functions for this 2048 // class. 2049 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2050 return true; 2051 2052 PureVirtualMethodCollector Collector(Context, RD); 2053 2054 for (PureVirtualMethodCollector::MethodList::const_iterator I = 2055 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 2056 const CXXMethodDecl *MD = *I; 2057 2058 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 2059 MD->getDeclName(); 2060 } 2061 2062 if (!PureVirtualClassDiagSet) 2063 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2064 PureVirtualClassDiagSet->insert(RD); 2065 2066 return true; 2067} 2068 2069namespace { 2070 class AbstractClassUsageDiagnoser 2071 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2072 Sema &SemaRef; 2073 CXXRecordDecl *AbstractClass; 2074 2075 bool VisitDeclContext(const DeclContext *DC) { 2076 bool Invalid = false; 2077 2078 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2079 E = DC->decls_end(); I != E; ++I) 2080 Invalid |= Visit(*I); 2081 2082 return Invalid; 2083 } 2084 2085 public: 2086 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2087 : SemaRef(SemaRef), AbstractClass(ac) { 2088 Visit(SemaRef.Context.getTranslationUnitDecl()); 2089 } 2090 2091 bool VisitFunctionDecl(const FunctionDecl *FD) { 2092 if (FD->isThisDeclarationADefinition()) { 2093 // No need to do the check if we're in a definition, because it requires 2094 // that the return/param types are complete. 2095 // because that requires 2096 return VisitDeclContext(FD); 2097 } 2098 2099 // Check the return type. 2100 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2101 bool Invalid = 2102 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2103 diag::err_abstract_type_in_decl, 2104 Sema::AbstractReturnType, 2105 AbstractClass); 2106 2107 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2108 E = FD->param_end(); I != E; ++I) { 2109 const ParmVarDecl *VD = *I; 2110 Invalid |= 2111 SemaRef.RequireNonAbstractType(VD->getLocation(), 2112 VD->getOriginalType(), 2113 diag::err_abstract_type_in_decl, 2114 Sema::AbstractParamType, 2115 AbstractClass); 2116 } 2117 2118 return Invalid; 2119 } 2120 2121 bool VisitDecl(const Decl* D) { 2122 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2123 return VisitDeclContext(DC); 2124 2125 return false; 2126 } 2127 }; 2128} 2129 2130/// \brief Perform semantic checks on a class definition that has been 2131/// completing, introducing implicitly-declared members, checking for 2132/// abstract types, etc. 2133void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2134 if (!Record || Record->isInvalidDecl()) 2135 return; 2136 2137 if (!Record->isDependentType()) 2138 AddImplicitlyDeclaredMembersToClass(Record); 2139 2140 if (Record->isInvalidDecl()) 2141 return; 2142 2143 // Set access bits correctly on the directly-declared conversions. 2144 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2145 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2146 Convs->setAccess(I, (*I)->getAccess()); 2147 2148 if (!Record->isAbstract()) { 2149 // Collect all the pure virtual methods and see if this is an abstract 2150 // class after all. 2151 PureVirtualMethodCollector Collector(Context, Record); 2152 if (!Collector.empty()) 2153 Record->setAbstract(true); 2154 } 2155 2156 if (Record->isAbstract()) 2157 (void)AbstractClassUsageDiagnoser(*this, Record); 2158} 2159 2160void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2161 DeclPtrTy TagDecl, 2162 SourceLocation LBrac, 2163 SourceLocation RBrac) { 2164 if (!TagDecl) 2165 return; 2166 2167 AdjustDeclIfTemplate(TagDecl); 2168 2169 ActOnFields(S, RLoc, TagDecl, 2170 (DeclPtrTy*)FieldCollector->getCurFields(), 2171 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 2172 2173 CheckCompletedCXXClass( 2174 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2175} 2176 2177/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2178/// special functions, such as the default constructor, copy 2179/// constructor, or destructor, to the given C++ class (C++ 2180/// [special]p1). This routine can only be executed just before the 2181/// definition of the class is complete. 2182void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2183 CanQualType ClassType 2184 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2185 2186 // FIXME: Implicit declarations have exception specifications, which are 2187 // the union of the specifications of the implicitly called functions. 2188 2189 if (!ClassDecl->hasUserDeclaredConstructor()) { 2190 // C++ [class.ctor]p5: 2191 // A default constructor for a class X is a constructor of class X 2192 // that can be called without an argument. If there is no 2193 // user-declared constructor for class X, a default constructor is 2194 // implicitly declared. An implicitly-declared default constructor 2195 // is an inline public member of its class. 2196 DeclarationName Name 2197 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2198 CXXConstructorDecl *DefaultCon = 2199 CXXConstructorDecl::Create(Context, ClassDecl, 2200 ClassDecl->getLocation(), Name, 2201 Context.getFunctionType(Context.VoidTy, 2202 0, 0, false, 0, 2203 /*FIXME*/false, false, 2204 0, 0, false, 2205 CC_Default), 2206 /*TInfo=*/0, 2207 /*isExplicit=*/false, 2208 /*isInline=*/true, 2209 /*isImplicitlyDeclared=*/true); 2210 DefaultCon->setAccess(AS_public); 2211 DefaultCon->setImplicit(); 2212 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2213 ClassDecl->addDecl(DefaultCon); 2214 } 2215 2216 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2217 // C++ [class.copy]p4: 2218 // If the class definition does not explicitly declare a copy 2219 // constructor, one is declared implicitly. 2220 2221 // C++ [class.copy]p5: 2222 // The implicitly-declared copy constructor for a class X will 2223 // have the form 2224 // 2225 // X::X(const X&) 2226 // 2227 // if 2228 bool HasConstCopyConstructor = true; 2229 2230 // -- each direct or virtual base class B of X has a copy 2231 // constructor whose first parameter is of type const B& or 2232 // const volatile B&, and 2233 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2234 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2235 const CXXRecordDecl *BaseClassDecl 2236 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2237 HasConstCopyConstructor 2238 = BaseClassDecl->hasConstCopyConstructor(Context); 2239 } 2240 2241 // -- for all the nonstatic data members of X that are of a 2242 // class type M (or array thereof), each such class type 2243 // has a copy constructor whose first parameter is of type 2244 // const M& or const volatile M&. 2245 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2246 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2247 ++Field) { 2248 QualType FieldType = (*Field)->getType(); 2249 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2250 FieldType = Array->getElementType(); 2251 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2252 const CXXRecordDecl *FieldClassDecl 2253 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2254 HasConstCopyConstructor 2255 = FieldClassDecl->hasConstCopyConstructor(Context); 2256 } 2257 } 2258 2259 // Otherwise, the implicitly declared copy constructor will have 2260 // the form 2261 // 2262 // X::X(X&) 2263 QualType ArgType = ClassType; 2264 if (HasConstCopyConstructor) 2265 ArgType = ArgType.withConst(); 2266 ArgType = Context.getLValueReferenceType(ArgType); 2267 2268 // An implicitly-declared copy constructor is an inline public 2269 // member of its class. 2270 DeclarationName Name 2271 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2272 CXXConstructorDecl *CopyConstructor 2273 = CXXConstructorDecl::Create(Context, ClassDecl, 2274 ClassDecl->getLocation(), Name, 2275 Context.getFunctionType(Context.VoidTy, 2276 &ArgType, 1, 2277 false, 0, 2278 /*FIXME:*/false, 2279 false, 0, 0, false, 2280 CC_Default), 2281 /*TInfo=*/0, 2282 /*isExplicit=*/false, 2283 /*isInline=*/true, 2284 /*isImplicitlyDeclared=*/true); 2285 CopyConstructor->setAccess(AS_public); 2286 CopyConstructor->setImplicit(); 2287 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2288 2289 // Add the parameter to the constructor. 2290 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2291 ClassDecl->getLocation(), 2292 /*IdentifierInfo=*/0, 2293 ArgType, /*TInfo=*/0, 2294 VarDecl::None, 0); 2295 CopyConstructor->setParams(&FromParam, 1); 2296 ClassDecl->addDecl(CopyConstructor); 2297 } 2298 2299 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2300 // Note: The following rules are largely analoguous to the copy 2301 // constructor rules. Note that virtual bases are not taken into account 2302 // for determining the argument type of the operator. Note also that 2303 // operators taking an object instead of a reference are allowed. 2304 // 2305 // C++ [class.copy]p10: 2306 // If the class definition does not explicitly declare a copy 2307 // assignment operator, one is declared implicitly. 2308 // The implicitly-defined copy assignment operator for a class X 2309 // will have the form 2310 // 2311 // X& X::operator=(const X&) 2312 // 2313 // if 2314 bool HasConstCopyAssignment = true; 2315 2316 // -- each direct base class B of X has a copy assignment operator 2317 // whose parameter is of type const B&, const volatile B& or B, 2318 // and 2319 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2320 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2321 assert(!Base->getType()->isDependentType() && 2322 "Cannot generate implicit members for class with dependent bases."); 2323 const CXXRecordDecl *BaseClassDecl 2324 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2325 const CXXMethodDecl *MD = 0; 2326 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2327 MD); 2328 } 2329 2330 // -- for all the nonstatic data members of X that are of a class 2331 // type M (or array thereof), each such class type has a copy 2332 // assignment operator whose parameter is of type const M&, 2333 // const volatile M& or M. 2334 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2335 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2336 ++Field) { 2337 QualType FieldType = (*Field)->getType(); 2338 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2339 FieldType = Array->getElementType(); 2340 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2341 const CXXRecordDecl *FieldClassDecl 2342 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2343 const CXXMethodDecl *MD = 0; 2344 HasConstCopyAssignment 2345 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2346 } 2347 } 2348 2349 // Otherwise, the implicitly declared copy assignment operator will 2350 // have the form 2351 // 2352 // X& X::operator=(X&) 2353 QualType ArgType = ClassType; 2354 QualType RetType = Context.getLValueReferenceType(ArgType); 2355 if (HasConstCopyAssignment) 2356 ArgType = ArgType.withConst(); 2357 ArgType = Context.getLValueReferenceType(ArgType); 2358 2359 // An implicitly-declared copy assignment operator is an inline public 2360 // member of its class. 2361 DeclarationName Name = 2362 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2363 CXXMethodDecl *CopyAssignment = 2364 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2365 Context.getFunctionType(RetType, &ArgType, 1, 2366 false, 0, 2367 /*FIXME:*/false, 2368 false, 0, 0, false, 2369 CC_Default), 2370 /*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2371 CopyAssignment->setAccess(AS_public); 2372 CopyAssignment->setImplicit(); 2373 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2374 CopyAssignment->setCopyAssignment(true); 2375 2376 // Add the parameter to the operator. 2377 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2378 ClassDecl->getLocation(), 2379 /*IdentifierInfo=*/0, 2380 ArgType, /*TInfo=*/0, 2381 VarDecl::None, 0); 2382 CopyAssignment->setParams(&FromParam, 1); 2383 2384 // Don't call addedAssignmentOperator. There is no way to distinguish an 2385 // implicit from an explicit assignment operator. 2386 ClassDecl->addDecl(CopyAssignment); 2387 AddOverriddenMethods(ClassDecl, CopyAssignment); 2388 } 2389 2390 if (!ClassDecl->hasUserDeclaredDestructor()) { 2391 // C++ [class.dtor]p2: 2392 // If a class has no user-declared destructor, a destructor is 2393 // declared implicitly. An implicitly-declared destructor is an 2394 // inline public member of its class. 2395 DeclarationName Name 2396 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2397 CXXDestructorDecl *Destructor 2398 = CXXDestructorDecl::Create(Context, ClassDecl, 2399 ClassDecl->getLocation(), Name, 2400 Context.getFunctionType(Context.VoidTy, 2401 0, 0, false, 0, 2402 /*FIXME:*/false, 2403 false, 0, 0, false, 2404 CC_Default), 2405 /*isInline=*/true, 2406 /*isImplicitlyDeclared=*/true); 2407 Destructor->setAccess(AS_public); 2408 Destructor->setImplicit(); 2409 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2410 ClassDecl->addDecl(Destructor); 2411 2412 AddOverriddenMethods(ClassDecl, Destructor); 2413 } 2414} 2415 2416void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2417 Decl *D = TemplateD.getAs<Decl>(); 2418 if (!D) 2419 return; 2420 2421 TemplateParameterList *Params = 0; 2422 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2423 Params = Template->getTemplateParameters(); 2424 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2425 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2426 Params = PartialSpec->getTemplateParameters(); 2427 else 2428 return; 2429 2430 for (TemplateParameterList::iterator Param = Params->begin(), 2431 ParamEnd = Params->end(); 2432 Param != ParamEnd; ++Param) { 2433 NamedDecl *Named = cast<NamedDecl>(*Param); 2434 if (Named->getDeclName()) { 2435 S->AddDecl(DeclPtrTy::make(Named)); 2436 IdResolver.AddDecl(Named); 2437 } 2438 } 2439} 2440 2441void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2442 if (!RecordD) return; 2443 AdjustDeclIfTemplate(RecordD); 2444 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2445 PushDeclContext(S, Record); 2446} 2447 2448void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2449 if (!RecordD) return; 2450 PopDeclContext(); 2451} 2452 2453/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2454/// parsing a top-level (non-nested) C++ class, and we are now 2455/// parsing those parts of the given Method declaration that could 2456/// not be parsed earlier (C++ [class.mem]p2), such as default 2457/// arguments. This action should enter the scope of the given 2458/// Method declaration as if we had just parsed the qualified method 2459/// name. However, it should not bring the parameters into scope; 2460/// that will be performed by ActOnDelayedCXXMethodParameter. 2461void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2462} 2463 2464/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2465/// C++ method declaration. We're (re-)introducing the given 2466/// function parameter into scope for use in parsing later parts of 2467/// the method declaration. For example, we could see an 2468/// ActOnParamDefaultArgument event for this parameter. 2469void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2470 if (!ParamD) 2471 return; 2472 2473 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2474 2475 // If this parameter has an unparsed default argument, clear it out 2476 // to make way for the parsed default argument. 2477 if (Param->hasUnparsedDefaultArg()) 2478 Param->setDefaultArg(0); 2479 2480 S->AddDecl(DeclPtrTy::make(Param)); 2481 if (Param->getDeclName()) 2482 IdResolver.AddDecl(Param); 2483} 2484 2485/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2486/// processing the delayed method declaration for Method. The method 2487/// declaration is now considered finished. There may be a separate 2488/// ActOnStartOfFunctionDef action later (not necessarily 2489/// immediately!) for this method, if it was also defined inside the 2490/// class body. 2491void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2492 if (!MethodD) 2493 return; 2494 2495 AdjustDeclIfTemplate(MethodD); 2496 2497 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2498 2499 // Now that we have our default arguments, check the constructor 2500 // again. It could produce additional diagnostics or affect whether 2501 // the class has implicitly-declared destructors, among other 2502 // things. 2503 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2504 CheckConstructor(Constructor); 2505 2506 // Check the default arguments, which we may have added. 2507 if (!Method->isInvalidDecl()) 2508 CheckCXXDefaultArguments(Method); 2509} 2510 2511/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2512/// the well-formedness of the constructor declarator @p D with type @p 2513/// R. If there are any errors in the declarator, this routine will 2514/// emit diagnostics and set the invalid bit to true. In any case, the type 2515/// will be updated to reflect a well-formed type for the constructor and 2516/// returned. 2517QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2518 FunctionDecl::StorageClass &SC) { 2519 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2520 2521 // C++ [class.ctor]p3: 2522 // A constructor shall not be virtual (10.3) or static (9.4). A 2523 // constructor can be invoked for a const, volatile or const 2524 // volatile object. A constructor shall not be declared const, 2525 // volatile, or const volatile (9.3.2). 2526 if (isVirtual) { 2527 if (!D.isInvalidType()) 2528 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2529 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2530 << SourceRange(D.getIdentifierLoc()); 2531 D.setInvalidType(); 2532 } 2533 if (SC == FunctionDecl::Static) { 2534 if (!D.isInvalidType()) 2535 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2536 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2537 << SourceRange(D.getIdentifierLoc()); 2538 D.setInvalidType(); 2539 SC = FunctionDecl::None; 2540 } 2541 2542 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2543 if (FTI.TypeQuals != 0) { 2544 if (FTI.TypeQuals & Qualifiers::Const) 2545 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2546 << "const" << SourceRange(D.getIdentifierLoc()); 2547 if (FTI.TypeQuals & Qualifiers::Volatile) 2548 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2549 << "volatile" << SourceRange(D.getIdentifierLoc()); 2550 if (FTI.TypeQuals & Qualifiers::Restrict) 2551 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2552 << "restrict" << SourceRange(D.getIdentifierLoc()); 2553 } 2554 2555 // Rebuild the function type "R" without any type qualifiers (in 2556 // case any of the errors above fired) and with "void" as the 2557 // return type, since constructors don't have return types. We 2558 // *always* have to do this, because GetTypeForDeclarator will 2559 // put in a result type of "int" when none was specified. 2560 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2561 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2562 Proto->getNumArgs(), 2563 Proto->isVariadic(), 0, 2564 Proto->hasExceptionSpec(), 2565 Proto->hasAnyExceptionSpec(), 2566 Proto->getNumExceptions(), 2567 Proto->exception_begin(), 2568 Proto->getNoReturnAttr(), 2569 Proto->getCallConv()); 2570} 2571 2572/// CheckConstructor - Checks a fully-formed constructor for 2573/// well-formedness, issuing any diagnostics required. Returns true if 2574/// the constructor declarator is invalid. 2575void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2576 CXXRecordDecl *ClassDecl 2577 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2578 if (!ClassDecl) 2579 return Constructor->setInvalidDecl(); 2580 2581 // C++ [class.copy]p3: 2582 // A declaration of a constructor for a class X is ill-formed if 2583 // its first parameter is of type (optionally cv-qualified) X and 2584 // either there are no other parameters or else all other 2585 // parameters have default arguments. 2586 if (!Constructor->isInvalidDecl() && 2587 ((Constructor->getNumParams() == 1) || 2588 (Constructor->getNumParams() > 1 && 2589 Constructor->getParamDecl(1)->hasDefaultArg())) && 2590 Constructor->getTemplateSpecializationKind() 2591 != TSK_ImplicitInstantiation) { 2592 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2593 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2594 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2595 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2596 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2597 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 2598 2599 // FIXME: Rather that making the constructor invalid, we should endeavor 2600 // to fix the type. 2601 Constructor->setInvalidDecl(); 2602 } 2603 } 2604 2605 // Notify the class that we've added a constructor. 2606 ClassDecl->addedConstructor(Context, Constructor); 2607} 2608 2609/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2610/// issuing any diagnostics required. Returns true on error. 2611bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2612 CXXRecordDecl *RD = Destructor->getParent(); 2613 2614 if (Destructor->isVirtual()) { 2615 SourceLocation Loc; 2616 2617 if (!Destructor->isImplicit()) 2618 Loc = Destructor->getLocation(); 2619 else 2620 Loc = RD->getLocation(); 2621 2622 // If we have a virtual destructor, look up the deallocation function 2623 FunctionDecl *OperatorDelete = 0; 2624 DeclarationName Name = 2625 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2626 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2627 return true; 2628 2629 Destructor->setOperatorDelete(OperatorDelete); 2630 } 2631 2632 return false; 2633} 2634 2635static inline bool 2636FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2637 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2638 FTI.ArgInfo[0].Param && 2639 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2640} 2641 2642/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2643/// the well-formednes of the destructor declarator @p D with type @p 2644/// R. If there are any errors in the declarator, this routine will 2645/// emit diagnostics and set the declarator to invalid. Even if this happens, 2646/// will be updated to reflect a well-formed type for the destructor and 2647/// returned. 2648QualType Sema::CheckDestructorDeclarator(Declarator &D, 2649 FunctionDecl::StorageClass& SC) { 2650 // C++ [class.dtor]p1: 2651 // [...] A typedef-name that names a class is a class-name 2652 // (7.1.3); however, a typedef-name that names a class shall not 2653 // be used as the identifier in the declarator for a destructor 2654 // declaration. 2655 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2656 if (isa<TypedefType>(DeclaratorType)) { 2657 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2658 << DeclaratorType; 2659 D.setInvalidType(); 2660 } 2661 2662 // C++ [class.dtor]p2: 2663 // A destructor is used to destroy objects of its class type. A 2664 // destructor takes no parameters, and no return type can be 2665 // specified for it (not even void). The address of a destructor 2666 // shall not be taken. A destructor shall not be static. A 2667 // destructor can be invoked for a const, volatile or const 2668 // volatile object. A destructor shall not be declared const, 2669 // volatile or const volatile (9.3.2). 2670 if (SC == FunctionDecl::Static) { 2671 if (!D.isInvalidType()) 2672 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2673 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2674 << SourceRange(D.getIdentifierLoc()); 2675 SC = FunctionDecl::None; 2676 D.setInvalidType(); 2677 } 2678 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2679 // Destructors don't have return types, but the parser will 2680 // happily parse something like: 2681 // 2682 // class X { 2683 // float ~X(); 2684 // }; 2685 // 2686 // The return type will be eliminated later. 2687 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2688 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2689 << SourceRange(D.getIdentifierLoc()); 2690 } 2691 2692 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2693 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2694 if (FTI.TypeQuals & Qualifiers::Const) 2695 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2696 << "const" << SourceRange(D.getIdentifierLoc()); 2697 if (FTI.TypeQuals & Qualifiers::Volatile) 2698 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2699 << "volatile" << SourceRange(D.getIdentifierLoc()); 2700 if (FTI.TypeQuals & Qualifiers::Restrict) 2701 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2702 << "restrict" << SourceRange(D.getIdentifierLoc()); 2703 D.setInvalidType(); 2704 } 2705 2706 // Make sure we don't have any parameters. 2707 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2708 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2709 2710 // Delete the parameters. 2711 FTI.freeArgs(); 2712 D.setInvalidType(); 2713 } 2714 2715 // Make sure the destructor isn't variadic. 2716 if (FTI.isVariadic) { 2717 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2718 D.setInvalidType(); 2719 } 2720 2721 // Rebuild the function type "R" without any type qualifiers or 2722 // parameters (in case any of the errors above fired) and with 2723 // "void" as the return type, since destructors don't have return 2724 // types. We *always* have to do this, because GetTypeForDeclarator 2725 // will put in a result type of "int" when none was specified. 2726 // FIXME: Exceptions! 2727 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 2728 false, false, 0, 0, false, CC_Default); 2729} 2730 2731/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2732/// well-formednes of the conversion function declarator @p D with 2733/// type @p R. If there are any errors in the declarator, this routine 2734/// will emit diagnostics and return true. Otherwise, it will return 2735/// false. Either way, the type @p R will be updated to reflect a 2736/// well-formed type for the conversion operator. 2737void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2738 FunctionDecl::StorageClass& SC) { 2739 // C++ [class.conv.fct]p1: 2740 // Neither parameter types nor return type can be specified. The 2741 // type of a conversion function (8.3.5) is "function taking no 2742 // parameter returning conversion-type-id." 2743 if (SC == FunctionDecl::Static) { 2744 if (!D.isInvalidType()) 2745 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2746 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2747 << SourceRange(D.getIdentifierLoc()); 2748 D.setInvalidType(); 2749 SC = FunctionDecl::None; 2750 } 2751 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2752 // Conversion functions don't have return types, but the parser will 2753 // happily parse something like: 2754 // 2755 // class X { 2756 // float operator bool(); 2757 // }; 2758 // 2759 // The return type will be changed later anyway. 2760 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2761 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2762 << SourceRange(D.getIdentifierLoc()); 2763 } 2764 2765 // Make sure we don't have any parameters. 2766 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2767 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2768 2769 // Delete the parameters. 2770 D.getTypeObject(0).Fun.freeArgs(); 2771 D.setInvalidType(); 2772 } 2773 2774 // Make sure the conversion function isn't variadic. 2775 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2776 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2777 D.setInvalidType(); 2778 } 2779 2780 // C++ [class.conv.fct]p4: 2781 // The conversion-type-id shall not represent a function type nor 2782 // an array type. 2783 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2784 if (ConvType->isArrayType()) { 2785 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2786 ConvType = Context.getPointerType(ConvType); 2787 D.setInvalidType(); 2788 } else if (ConvType->isFunctionType()) { 2789 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2790 ConvType = Context.getPointerType(ConvType); 2791 D.setInvalidType(); 2792 } 2793 2794 // Rebuild the function type "R" without any parameters (in case any 2795 // of the errors above fired) and with the conversion type as the 2796 // return type. 2797 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2798 R = Context.getFunctionType(ConvType, 0, 0, false, 2799 Proto->getTypeQuals(), 2800 Proto->hasExceptionSpec(), 2801 Proto->hasAnyExceptionSpec(), 2802 Proto->getNumExceptions(), 2803 Proto->exception_begin(), 2804 Proto->getNoReturnAttr(), 2805 Proto->getCallConv()); 2806 2807 // C++0x explicit conversion operators. 2808 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2809 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2810 diag::warn_explicit_conversion_functions) 2811 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2812} 2813 2814/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2815/// the declaration of the given C++ conversion function. This routine 2816/// is responsible for recording the conversion function in the C++ 2817/// class, if possible. 2818Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2819 assert(Conversion && "Expected to receive a conversion function declaration"); 2820 2821 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2822 2823 // Make sure we aren't redeclaring the conversion function. 2824 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2825 2826 // C++ [class.conv.fct]p1: 2827 // [...] A conversion function is never used to convert a 2828 // (possibly cv-qualified) object to the (possibly cv-qualified) 2829 // same object type (or a reference to it), to a (possibly 2830 // cv-qualified) base class of that type (or a reference to it), 2831 // or to (possibly cv-qualified) void. 2832 // FIXME: Suppress this warning if the conversion function ends up being a 2833 // virtual function that overrides a virtual function in a base class. 2834 QualType ClassType 2835 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2836 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2837 ConvType = ConvTypeRef->getPointeeType(); 2838 if (ConvType->isRecordType()) { 2839 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2840 if (ConvType == ClassType) 2841 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2842 << ClassType; 2843 else if (IsDerivedFrom(ClassType, ConvType)) 2844 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2845 << ClassType << ConvType; 2846 } else if (ConvType->isVoidType()) { 2847 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2848 << ClassType << ConvType; 2849 } 2850 2851 if (Conversion->getPrimaryTemplate()) { 2852 // ignore specializations 2853 } else if (Conversion->getPreviousDeclaration()) { 2854 if (FunctionTemplateDecl *ConversionTemplate 2855 = Conversion->getDescribedFunctionTemplate()) { 2856 if (ClassDecl->replaceConversion( 2857 ConversionTemplate->getPreviousDeclaration(), 2858 ConversionTemplate)) 2859 return DeclPtrTy::make(ConversionTemplate); 2860 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 2861 Conversion)) 2862 return DeclPtrTy::make(Conversion); 2863 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2864 } else if (FunctionTemplateDecl *ConversionTemplate 2865 = Conversion->getDescribedFunctionTemplate()) 2866 ClassDecl->addConversionFunction(ConversionTemplate); 2867 else 2868 ClassDecl->addConversionFunction(Conversion); 2869 2870 return DeclPtrTy::make(Conversion); 2871} 2872 2873//===----------------------------------------------------------------------===// 2874// Namespace Handling 2875//===----------------------------------------------------------------------===// 2876 2877/// ActOnStartNamespaceDef - This is called at the start of a namespace 2878/// definition. 2879Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2880 SourceLocation IdentLoc, 2881 IdentifierInfo *II, 2882 SourceLocation LBrace, 2883 AttributeList *AttrList) { 2884 NamespaceDecl *Namespc = 2885 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2886 Namespc->setLBracLoc(LBrace); 2887 2888 Scope *DeclRegionScope = NamespcScope->getParent(); 2889 2890 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 2891 2892 if (II) { 2893 // C++ [namespace.def]p2: 2894 // The identifier in an original-namespace-definition shall not have been 2895 // previously defined in the declarative region in which the 2896 // original-namespace-definition appears. The identifier in an 2897 // original-namespace-definition is the name of the namespace. Subsequently 2898 // in that declarative region, it is treated as an original-namespace-name. 2899 2900 NamedDecl *PrevDecl 2901 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2902 ForRedeclaration); 2903 2904 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2905 // This is an extended namespace definition. 2906 // Attach this namespace decl to the chain of extended namespace 2907 // definitions. 2908 OrigNS->setNextNamespace(Namespc); 2909 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2910 2911 // Remove the previous declaration from the scope. 2912 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2913 IdResolver.RemoveDecl(OrigNS); 2914 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2915 } 2916 } else if (PrevDecl) { 2917 // This is an invalid name redefinition. 2918 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2919 << Namespc->getDeclName(); 2920 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2921 Namespc->setInvalidDecl(); 2922 // Continue on to push Namespc as current DeclContext and return it. 2923 } else if (II->isStr("std") && 2924 CurContext->getLookupContext()->isTranslationUnit()) { 2925 // This is the first "real" definition of the namespace "std", so update 2926 // our cache of the "std" namespace to point at this definition. 2927 if (StdNamespace) { 2928 // We had already defined a dummy namespace "std". Link this new 2929 // namespace definition to the dummy namespace "std". 2930 StdNamespace->setNextNamespace(Namespc); 2931 StdNamespace->setLocation(IdentLoc); 2932 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2933 } 2934 2935 // Make our StdNamespace cache point at the first real definition of the 2936 // "std" namespace. 2937 StdNamespace = Namespc; 2938 } 2939 2940 PushOnScopeChains(Namespc, DeclRegionScope); 2941 } else { 2942 // Anonymous namespaces. 2943 assert(Namespc->isAnonymousNamespace()); 2944 CurContext->addDecl(Namespc); 2945 2946 // Link the anonymous namespace into its parent. 2947 NamespaceDecl *PrevDecl; 2948 DeclContext *Parent = CurContext->getLookupContext(); 2949 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 2950 PrevDecl = TU->getAnonymousNamespace(); 2951 TU->setAnonymousNamespace(Namespc); 2952 } else { 2953 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 2954 PrevDecl = ND->getAnonymousNamespace(); 2955 ND->setAnonymousNamespace(Namespc); 2956 } 2957 2958 // Link the anonymous namespace with its previous declaration. 2959 if (PrevDecl) { 2960 assert(PrevDecl->isAnonymousNamespace()); 2961 assert(!PrevDecl->getNextNamespace()); 2962 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 2963 PrevDecl->setNextNamespace(Namespc); 2964 } 2965 2966 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2967 // behaves as if it were replaced by 2968 // namespace unique { /* empty body */ } 2969 // using namespace unique; 2970 // namespace unique { namespace-body } 2971 // where all occurrences of 'unique' in a translation unit are 2972 // replaced by the same identifier and this identifier differs 2973 // from all other identifiers in the entire program. 2974 2975 // We just create the namespace with an empty name and then add an 2976 // implicit using declaration, just like the standard suggests. 2977 // 2978 // CodeGen enforces the "universally unique" aspect by giving all 2979 // declarations semantically contained within an anonymous 2980 // namespace internal linkage. 2981 2982 if (!PrevDecl) { 2983 UsingDirectiveDecl* UD 2984 = UsingDirectiveDecl::Create(Context, CurContext, 2985 /* 'using' */ LBrace, 2986 /* 'namespace' */ SourceLocation(), 2987 /* qualifier */ SourceRange(), 2988 /* NNS */ NULL, 2989 /* identifier */ SourceLocation(), 2990 Namespc, 2991 /* Ancestor */ CurContext); 2992 UD->setImplicit(); 2993 CurContext->addDecl(UD); 2994 } 2995 } 2996 2997 // Although we could have an invalid decl (i.e. the namespace name is a 2998 // redefinition), push it as current DeclContext and try to continue parsing. 2999 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3000 // for the namespace has the declarations that showed up in that particular 3001 // namespace definition. 3002 PushDeclContext(NamespcScope, Namespc); 3003 return DeclPtrTy::make(Namespc); 3004} 3005 3006/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3007/// is a namespace alias, returns the namespace it points to. 3008static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3009 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3010 return AD->getNamespace(); 3011 return dyn_cast_or_null<NamespaceDecl>(D); 3012} 3013 3014/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3015/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3016void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3017 Decl *Dcl = D.getAs<Decl>(); 3018 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3019 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3020 Namespc->setRBracLoc(RBrace); 3021 PopDeclContext(); 3022} 3023 3024Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3025 SourceLocation UsingLoc, 3026 SourceLocation NamespcLoc, 3027 const CXXScopeSpec &SS, 3028 SourceLocation IdentLoc, 3029 IdentifierInfo *NamespcName, 3030 AttributeList *AttrList) { 3031 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3032 assert(NamespcName && "Invalid NamespcName."); 3033 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3034 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3035 3036 UsingDirectiveDecl *UDir = 0; 3037 3038 // Lookup namespace name. 3039 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3040 LookupParsedName(R, S, &SS); 3041 if (R.isAmbiguous()) 3042 return DeclPtrTy(); 3043 3044 if (!R.empty()) { 3045 NamedDecl *Named = R.getFoundDecl(); 3046 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3047 && "expected namespace decl"); 3048 // C++ [namespace.udir]p1: 3049 // A using-directive specifies that the names in the nominated 3050 // namespace can be used in the scope in which the 3051 // using-directive appears after the using-directive. During 3052 // unqualified name lookup (3.4.1), the names appear as if they 3053 // were declared in the nearest enclosing namespace which 3054 // contains both the using-directive and the nominated 3055 // namespace. [Note: in this context, "contains" means "contains 3056 // directly or indirectly". ] 3057 3058 // Find enclosing context containing both using-directive and 3059 // nominated namespace. 3060 NamespaceDecl *NS = getNamespaceDecl(Named); 3061 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3062 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3063 CommonAncestor = CommonAncestor->getParent(); 3064 3065 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3066 SS.getRange(), 3067 (NestedNameSpecifier *)SS.getScopeRep(), 3068 IdentLoc, Named, CommonAncestor); 3069 PushUsingDirective(S, UDir); 3070 } else { 3071 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3072 } 3073 3074 // FIXME: We ignore attributes for now. 3075 delete AttrList; 3076 return DeclPtrTy::make(UDir); 3077} 3078 3079void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3080 // If scope has associated entity, then using directive is at namespace 3081 // or translation unit scope. We add UsingDirectiveDecls, into 3082 // it's lookup structure. 3083 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3084 Ctx->addDecl(UDir); 3085 else 3086 // Otherwise it is block-sope. using-directives will affect lookup 3087 // only to the end of scope. 3088 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3089} 3090 3091 3092Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3093 AccessSpecifier AS, 3094 bool HasUsingKeyword, 3095 SourceLocation UsingLoc, 3096 const CXXScopeSpec &SS, 3097 UnqualifiedId &Name, 3098 AttributeList *AttrList, 3099 bool IsTypeName, 3100 SourceLocation TypenameLoc) { 3101 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3102 3103 switch (Name.getKind()) { 3104 case UnqualifiedId::IK_Identifier: 3105 case UnqualifiedId::IK_OperatorFunctionId: 3106 case UnqualifiedId::IK_LiteralOperatorId: 3107 case UnqualifiedId::IK_ConversionFunctionId: 3108 break; 3109 3110 case UnqualifiedId::IK_ConstructorName: 3111 case UnqualifiedId::IK_ConstructorTemplateId: 3112 // C++0x inherited constructors. 3113 if (getLangOptions().CPlusPlus0x) break; 3114 3115 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3116 << SS.getRange(); 3117 return DeclPtrTy(); 3118 3119 case UnqualifiedId::IK_DestructorName: 3120 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3121 << SS.getRange(); 3122 return DeclPtrTy(); 3123 3124 case UnqualifiedId::IK_TemplateId: 3125 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3126 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3127 return DeclPtrTy(); 3128 } 3129 3130 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3131 if (!TargetName) 3132 return DeclPtrTy(); 3133 3134 // Warn about using declarations. 3135 // TODO: store that the declaration was written without 'using' and 3136 // talk about access decls instead of using decls in the 3137 // diagnostics. 3138 if (!HasUsingKeyword) { 3139 UsingLoc = Name.getSourceRange().getBegin(); 3140 3141 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3142 << CodeModificationHint::CreateInsertion(SS.getRange().getBegin(), 3143 "using "); 3144 } 3145 3146 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3147 Name.getSourceRange().getBegin(), 3148 TargetName, AttrList, 3149 /* IsInstantiation */ false, 3150 IsTypeName, TypenameLoc); 3151 if (UD) 3152 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3153 3154 return DeclPtrTy::make(UD); 3155} 3156 3157/// Determines whether to create a using shadow decl for a particular 3158/// decl, given the set of decls existing prior to this using lookup. 3159bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3160 const LookupResult &Previous) { 3161 // Diagnose finding a decl which is not from a base class of the 3162 // current class. We do this now because there are cases where this 3163 // function will silently decide not to build a shadow decl, which 3164 // will pre-empt further diagnostics. 3165 // 3166 // We don't need to do this in C++0x because we do the check once on 3167 // the qualifier. 3168 // 3169 // FIXME: diagnose the following if we care enough: 3170 // struct A { int foo; }; 3171 // struct B : A { using A::foo; }; 3172 // template <class T> struct C : A {}; 3173 // template <class T> struct D : C<T> { using B::foo; } // <--- 3174 // This is invalid (during instantiation) in C++03 because B::foo 3175 // resolves to the using decl in B, which is not a base class of D<T>. 3176 // We can't diagnose it immediately because C<T> is an unknown 3177 // specialization. The UsingShadowDecl in D<T> then points directly 3178 // to A::foo, which will look well-formed when we instantiate. 3179 // The right solution is to not collapse the shadow-decl chain. 3180 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3181 DeclContext *OrigDC = Orig->getDeclContext(); 3182 3183 // Handle enums and anonymous structs. 3184 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3185 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3186 while (OrigRec->isAnonymousStructOrUnion()) 3187 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3188 3189 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3190 if (OrigDC == CurContext) { 3191 Diag(Using->getLocation(), 3192 diag::err_using_decl_nested_name_specifier_is_current_class) 3193 << Using->getNestedNameRange(); 3194 Diag(Orig->getLocation(), diag::note_using_decl_target); 3195 return true; 3196 } 3197 3198 Diag(Using->getNestedNameRange().getBegin(), 3199 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3200 << Using->getTargetNestedNameDecl() 3201 << cast<CXXRecordDecl>(CurContext) 3202 << Using->getNestedNameRange(); 3203 Diag(Orig->getLocation(), diag::note_using_decl_target); 3204 return true; 3205 } 3206 } 3207 3208 if (Previous.empty()) return false; 3209 3210 NamedDecl *Target = Orig; 3211 if (isa<UsingShadowDecl>(Target)) 3212 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3213 3214 // If the target happens to be one of the previous declarations, we 3215 // don't have a conflict. 3216 // 3217 // FIXME: but we might be increasing its access, in which case we 3218 // should redeclare it. 3219 NamedDecl *NonTag = 0, *Tag = 0; 3220 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3221 I != E; ++I) { 3222 NamedDecl *D = (*I)->getUnderlyingDecl(); 3223 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3224 return false; 3225 3226 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3227 } 3228 3229 if (Target->isFunctionOrFunctionTemplate()) { 3230 FunctionDecl *FD; 3231 if (isa<FunctionTemplateDecl>(Target)) 3232 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3233 else 3234 FD = cast<FunctionDecl>(Target); 3235 3236 NamedDecl *OldDecl = 0; 3237 switch (CheckOverload(FD, Previous, OldDecl)) { 3238 case Ovl_Overload: 3239 return false; 3240 3241 case Ovl_NonFunction: 3242 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3243 break; 3244 3245 // We found a decl with the exact signature. 3246 case Ovl_Match: 3247 if (isa<UsingShadowDecl>(OldDecl)) { 3248 // Silently ignore the possible conflict. 3249 return false; 3250 } 3251 3252 // If we're in a record, we want to hide the target, so we 3253 // return true (without a diagnostic) to tell the caller not to 3254 // build a shadow decl. 3255 if (CurContext->isRecord()) 3256 return true; 3257 3258 // If we're not in a record, this is an error. 3259 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3260 break; 3261 } 3262 3263 Diag(Target->getLocation(), diag::note_using_decl_target); 3264 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3265 return true; 3266 } 3267 3268 // Target is not a function. 3269 3270 if (isa<TagDecl>(Target)) { 3271 // No conflict between a tag and a non-tag. 3272 if (!Tag) return false; 3273 3274 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3275 Diag(Target->getLocation(), diag::note_using_decl_target); 3276 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3277 return true; 3278 } 3279 3280 // No conflict between a tag and a non-tag. 3281 if (!NonTag) return false; 3282 3283 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3284 Diag(Target->getLocation(), diag::note_using_decl_target); 3285 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3286 return true; 3287} 3288 3289/// Builds a shadow declaration corresponding to a 'using' declaration. 3290UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3291 UsingDecl *UD, 3292 NamedDecl *Orig) { 3293 3294 // If we resolved to another shadow declaration, just coalesce them. 3295 NamedDecl *Target = Orig; 3296 if (isa<UsingShadowDecl>(Target)) { 3297 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3298 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3299 } 3300 3301 UsingShadowDecl *Shadow 3302 = UsingShadowDecl::Create(Context, CurContext, 3303 UD->getLocation(), UD, Target); 3304 UD->addShadowDecl(Shadow); 3305 3306 if (S) 3307 PushOnScopeChains(Shadow, S); 3308 else 3309 CurContext->addDecl(Shadow); 3310 Shadow->setAccess(UD->getAccess()); 3311 3312 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3313 Shadow->setInvalidDecl(); 3314 3315 return Shadow; 3316} 3317 3318/// Hides a using shadow declaration. This is required by the current 3319/// using-decl implementation when a resolvable using declaration in a 3320/// class is followed by a declaration which would hide or override 3321/// one or more of the using decl's targets; for example: 3322/// 3323/// struct Base { void foo(int); }; 3324/// struct Derived : Base { 3325/// using Base::foo; 3326/// void foo(int); 3327/// }; 3328/// 3329/// The governing language is C++03 [namespace.udecl]p12: 3330/// 3331/// When a using-declaration brings names from a base class into a 3332/// derived class scope, member functions in the derived class 3333/// override and/or hide member functions with the same name and 3334/// parameter types in a base class (rather than conflicting). 3335/// 3336/// There are two ways to implement this: 3337/// (1) optimistically create shadow decls when they're not hidden 3338/// by existing declarations, or 3339/// (2) don't create any shadow decls (or at least don't make them 3340/// visible) until we've fully parsed/instantiated the class. 3341/// The problem with (1) is that we might have to retroactively remove 3342/// a shadow decl, which requires several O(n) operations because the 3343/// decl structures are (very reasonably) not designed for removal. 3344/// (2) avoids this but is very fiddly and phase-dependent. 3345void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3346 // Remove it from the DeclContext... 3347 Shadow->getDeclContext()->removeDecl(Shadow); 3348 3349 // ...and the scope, if applicable... 3350 if (S) { 3351 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3352 IdResolver.RemoveDecl(Shadow); 3353 } 3354 3355 // ...and the using decl. 3356 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3357 3358 // TODO: complain somehow if Shadow was used. It shouldn't 3359 // be possible for this to happen, because 3360} 3361 3362/// Builds a using declaration. 3363/// 3364/// \param IsInstantiation - Whether this call arises from an 3365/// instantiation of an unresolved using declaration. We treat 3366/// the lookup differently for these declarations. 3367NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3368 SourceLocation UsingLoc, 3369 const CXXScopeSpec &SS, 3370 SourceLocation IdentLoc, 3371 DeclarationName Name, 3372 AttributeList *AttrList, 3373 bool IsInstantiation, 3374 bool IsTypeName, 3375 SourceLocation TypenameLoc) { 3376 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3377 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3378 3379 // FIXME: We ignore attributes for now. 3380 delete AttrList; 3381 3382 if (SS.isEmpty()) { 3383 Diag(IdentLoc, diag::err_using_requires_qualname); 3384 return 0; 3385 } 3386 3387 // Do the redeclaration lookup in the current scope. 3388 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3389 ForRedeclaration); 3390 Previous.setHideTags(false); 3391 if (S) { 3392 LookupName(Previous, S); 3393 3394 // It is really dumb that we have to do this. 3395 LookupResult::Filter F = Previous.makeFilter(); 3396 while (F.hasNext()) { 3397 NamedDecl *D = F.next(); 3398 if (!isDeclInScope(D, CurContext, S)) 3399 F.erase(); 3400 } 3401 F.done(); 3402 } else { 3403 assert(IsInstantiation && "no scope in non-instantiation"); 3404 assert(CurContext->isRecord() && "scope not record in instantiation"); 3405 LookupQualifiedName(Previous, CurContext); 3406 } 3407 3408 NestedNameSpecifier *NNS = 3409 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3410 3411 // Check for invalid redeclarations. 3412 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3413 return 0; 3414 3415 // Check for bad qualifiers. 3416 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3417 return 0; 3418 3419 DeclContext *LookupContext = computeDeclContext(SS); 3420 NamedDecl *D; 3421 if (!LookupContext) { 3422 if (IsTypeName) { 3423 // FIXME: not all declaration name kinds are legal here 3424 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3425 UsingLoc, TypenameLoc, 3426 SS.getRange(), NNS, 3427 IdentLoc, Name); 3428 } else { 3429 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3430 UsingLoc, SS.getRange(), NNS, 3431 IdentLoc, Name); 3432 } 3433 } else { 3434 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3435 SS.getRange(), UsingLoc, NNS, Name, 3436 IsTypeName); 3437 } 3438 D->setAccess(AS); 3439 CurContext->addDecl(D); 3440 3441 if (!LookupContext) return D; 3442 UsingDecl *UD = cast<UsingDecl>(D); 3443 3444 if (RequireCompleteDeclContext(SS)) { 3445 UD->setInvalidDecl(); 3446 return UD; 3447 } 3448 3449 // Look up the target name. 3450 3451 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3452 3453 // Unlike most lookups, we don't always want to hide tag 3454 // declarations: tag names are visible through the using declaration 3455 // even if hidden by ordinary names, *except* in a dependent context 3456 // where it's important for the sanity of two-phase lookup. 3457 if (!IsInstantiation) 3458 R.setHideTags(false); 3459 3460 LookupQualifiedName(R, LookupContext); 3461 3462 if (R.empty()) { 3463 Diag(IdentLoc, diag::err_no_member) 3464 << Name << LookupContext << SS.getRange(); 3465 UD->setInvalidDecl(); 3466 return UD; 3467 } 3468 3469 if (R.isAmbiguous()) { 3470 UD->setInvalidDecl(); 3471 return UD; 3472 } 3473 3474 if (IsTypeName) { 3475 // If we asked for a typename and got a non-type decl, error out. 3476 if (!R.getAsSingle<TypeDecl>()) { 3477 Diag(IdentLoc, diag::err_using_typename_non_type); 3478 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3479 Diag((*I)->getUnderlyingDecl()->getLocation(), 3480 diag::note_using_decl_target); 3481 UD->setInvalidDecl(); 3482 return UD; 3483 } 3484 } else { 3485 // If we asked for a non-typename and we got a type, error out, 3486 // but only if this is an instantiation of an unresolved using 3487 // decl. Otherwise just silently find the type name. 3488 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3489 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3490 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3491 UD->setInvalidDecl(); 3492 return UD; 3493 } 3494 } 3495 3496 // C++0x N2914 [namespace.udecl]p6: 3497 // A using-declaration shall not name a namespace. 3498 if (R.getAsSingle<NamespaceDecl>()) { 3499 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3500 << SS.getRange(); 3501 UD->setInvalidDecl(); 3502 return UD; 3503 } 3504 3505 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3506 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3507 BuildUsingShadowDecl(S, UD, *I); 3508 } 3509 3510 return UD; 3511} 3512 3513/// Checks that the given using declaration is not an invalid 3514/// redeclaration. Note that this is checking only for the using decl 3515/// itself, not for any ill-formedness among the UsingShadowDecls. 3516bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3517 bool isTypeName, 3518 const CXXScopeSpec &SS, 3519 SourceLocation NameLoc, 3520 const LookupResult &Prev) { 3521 // C++03 [namespace.udecl]p8: 3522 // C++0x [namespace.udecl]p10: 3523 // A using-declaration is a declaration and can therefore be used 3524 // repeatedly where (and only where) multiple declarations are 3525 // allowed. 3526 // That's only in file contexts. 3527 if (CurContext->getLookupContext()->isFileContext()) 3528 return false; 3529 3530 NestedNameSpecifier *Qual 3531 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3532 3533 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3534 NamedDecl *D = *I; 3535 3536 bool DTypename; 3537 NestedNameSpecifier *DQual; 3538 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3539 DTypename = UD->isTypeName(); 3540 DQual = UD->getTargetNestedNameDecl(); 3541 } else if (UnresolvedUsingValueDecl *UD 3542 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3543 DTypename = false; 3544 DQual = UD->getTargetNestedNameSpecifier(); 3545 } else if (UnresolvedUsingTypenameDecl *UD 3546 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3547 DTypename = true; 3548 DQual = UD->getTargetNestedNameSpecifier(); 3549 } else continue; 3550 3551 // using decls differ if one says 'typename' and the other doesn't. 3552 // FIXME: non-dependent using decls? 3553 if (isTypeName != DTypename) continue; 3554 3555 // using decls differ if they name different scopes (but note that 3556 // template instantiation can cause this check to trigger when it 3557 // didn't before instantiation). 3558 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3559 Context.getCanonicalNestedNameSpecifier(DQual)) 3560 continue; 3561 3562 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3563 Diag(D->getLocation(), diag::note_using_decl) << 1; 3564 return true; 3565 } 3566 3567 return false; 3568} 3569 3570 3571/// Checks that the given nested-name qualifier used in a using decl 3572/// in the current context is appropriately related to the current 3573/// scope. If an error is found, diagnoses it and returns true. 3574bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3575 const CXXScopeSpec &SS, 3576 SourceLocation NameLoc) { 3577 DeclContext *NamedContext = computeDeclContext(SS); 3578 3579 if (!CurContext->isRecord()) { 3580 // C++03 [namespace.udecl]p3: 3581 // C++0x [namespace.udecl]p8: 3582 // A using-declaration for a class member shall be a member-declaration. 3583 3584 // If we weren't able to compute a valid scope, it must be a 3585 // dependent class scope. 3586 if (!NamedContext || NamedContext->isRecord()) { 3587 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3588 << SS.getRange(); 3589 return true; 3590 } 3591 3592 // Otherwise, everything is known to be fine. 3593 return false; 3594 } 3595 3596 // The current scope is a record. 3597 3598 // If the named context is dependent, we can't decide much. 3599 if (!NamedContext) { 3600 // FIXME: in C++0x, we can diagnose if we can prove that the 3601 // nested-name-specifier does not refer to a base class, which is 3602 // still possible in some cases. 3603 3604 // Otherwise we have to conservatively report that things might be 3605 // okay. 3606 return false; 3607 } 3608 3609 if (!NamedContext->isRecord()) { 3610 // Ideally this would point at the last name in the specifier, 3611 // but we don't have that level of source info. 3612 Diag(SS.getRange().getBegin(), 3613 diag::err_using_decl_nested_name_specifier_is_not_class) 3614 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3615 return true; 3616 } 3617 3618 if (getLangOptions().CPlusPlus0x) { 3619 // C++0x [namespace.udecl]p3: 3620 // In a using-declaration used as a member-declaration, the 3621 // nested-name-specifier shall name a base class of the class 3622 // being defined. 3623 3624 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3625 cast<CXXRecordDecl>(NamedContext))) { 3626 if (CurContext == NamedContext) { 3627 Diag(NameLoc, 3628 diag::err_using_decl_nested_name_specifier_is_current_class) 3629 << SS.getRange(); 3630 return true; 3631 } 3632 3633 Diag(SS.getRange().getBegin(), 3634 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3635 << (NestedNameSpecifier*) SS.getScopeRep() 3636 << cast<CXXRecordDecl>(CurContext) 3637 << SS.getRange(); 3638 return true; 3639 } 3640 3641 return false; 3642 } 3643 3644 // C++03 [namespace.udecl]p4: 3645 // A using-declaration used as a member-declaration shall refer 3646 // to a member of a base class of the class being defined [etc.]. 3647 3648 // Salient point: SS doesn't have to name a base class as long as 3649 // lookup only finds members from base classes. Therefore we can 3650 // diagnose here only if we can prove that that can't happen, 3651 // i.e. if the class hierarchies provably don't intersect. 3652 3653 // TODO: it would be nice if "definitely valid" results were cached 3654 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3655 // need to be repeated. 3656 3657 struct UserData { 3658 llvm::DenseSet<const CXXRecordDecl*> Bases; 3659 3660 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3661 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3662 Data->Bases.insert(Base); 3663 return true; 3664 } 3665 3666 bool hasDependentBases(const CXXRecordDecl *Class) { 3667 return !Class->forallBases(collect, this); 3668 } 3669 3670 /// Returns true if the base is dependent or is one of the 3671 /// accumulated base classes. 3672 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3673 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3674 return !Data->Bases.count(Base); 3675 } 3676 3677 bool mightShareBases(const CXXRecordDecl *Class) { 3678 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3679 } 3680 }; 3681 3682 UserData Data; 3683 3684 // Returns false if we find a dependent base. 3685 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3686 return false; 3687 3688 // Returns false if the class has a dependent base or if it or one 3689 // of its bases is present in the base set of the current context. 3690 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3691 return false; 3692 3693 Diag(SS.getRange().getBegin(), 3694 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3695 << (NestedNameSpecifier*) SS.getScopeRep() 3696 << cast<CXXRecordDecl>(CurContext) 3697 << SS.getRange(); 3698 3699 return true; 3700} 3701 3702Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3703 SourceLocation NamespaceLoc, 3704 SourceLocation AliasLoc, 3705 IdentifierInfo *Alias, 3706 const CXXScopeSpec &SS, 3707 SourceLocation IdentLoc, 3708 IdentifierInfo *Ident) { 3709 3710 // Lookup the namespace name. 3711 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3712 LookupParsedName(R, S, &SS); 3713 3714 // Check if we have a previous declaration with the same name. 3715 if (NamedDecl *PrevDecl 3716 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3717 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3718 // We already have an alias with the same name that points to the same 3719 // namespace, so don't create a new one. 3720 if (!R.isAmbiguous() && !R.empty() && 3721 AD->getNamespace() == getNamespaceDecl(R.getFoundDecl())) 3722 return DeclPtrTy(); 3723 } 3724 3725 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3726 diag::err_redefinition_different_kind; 3727 Diag(AliasLoc, DiagID) << Alias; 3728 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3729 return DeclPtrTy(); 3730 } 3731 3732 if (R.isAmbiguous()) 3733 return DeclPtrTy(); 3734 3735 if (R.empty()) { 3736 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3737 return DeclPtrTy(); 3738 } 3739 3740 NamespaceAliasDecl *AliasDecl = 3741 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3742 Alias, SS.getRange(), 3743 (NestedNameSpecifier *)SS.getScopeRep(), 3744 IdentLoc, R.getFoundDecl()); 3745 3746 PushOnScopeChains(AliasDecl, S); 3747 return DeclPtrTy::make(AliasDecl); 3748} 3749 3750void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3751 CXXConstructorDecl *Constructor) { 3752 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3753 !Constructor->isUsed()) && 3754 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3755 3756 CXXRecordDecl *ClassDecl 3757 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3758 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3759 3760 DeclContext *PreviousContext = CurContext; 3761 CurContext = Constructor; 3762 if (SetBaseOrMemberInitializers(Constructor, 0, 0, true, false)) { 3763 Diag(CurrentLocation, diag::note_member_synthesized_at) 3764 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 3765 Constructor->setInvalidDecl(); 3766 } else { 3767 Constructor->setUsed(); 3768 } 3769 CurContext = PreviousContext; 3770} 3771 3772void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3773 CXXDestructorDecl *Destructor) { 3774 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3775 "DefineImplicitDestructor - call it for implicit default dtor"); 3776 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3777 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3778 3779 DeclContext *PreviousContext = CurContext; 3780 CurContext = Destructor; 3781 3782 // C++ [class.dtor] p5 3783 // Before the implicitly-declared default destructor for a class is 3784 // implicitly defined, all the implicitly-declared default destructors 3785 // for its base class and its non-static data members shall have been 3786 // implicitly defined. 3787 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3788 E = ClassDecl->bases_end(); Base != E; ++Base) { 3789 CXXRecordDecl *BaseClassDecl 3790 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3791 if (!BaseClassDecl->hasTrivialDestructor()) { 3792 if (CXXDestructorDecl *BaseDtor = 3793 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 3794 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 3795 else 3796 assert(false && 3797 "DefineImplicitDestructor - missing dtor in a base class"); 3798 } 3799 } 3800 3801 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3802 E = ClassDecl->field_end(); Field != E; ++Field) { 3803 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3804 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3805 FieldType = Array->getElementType(); 3806 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3807 CXXRecordDecl *FieldClassDecl 3808 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3809 if (!FieldClassDecl->hasTrivialDestructor()) { 3810 if (CXXDestructorDecl *FieldDtor = 3811 const_cast<CXXDestructorDecl*>( 3812 FieldClassDecl->getDestructor(Context))) 3813 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 3814 else 3815 assert(false && 3816 "DefineImplicitDestructor - missing dtor in class of a data member"); 3817 } 3818 } 3819 } 3820 3821 // FIXME: If CheckDestructor fails, we should emit a note about where the 3822 // implicit destructor was needed. 3823 if (CheckDestructor(Destructor)) { 3824 Diag(CurrentLocation, diag::note_member_synthesized_at) 3825 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3826 3827 Destructor->setInvalidDecl(); 3828 CurContext = PreviousContext; 3829 3830 return; 3831 } 3832 CurContext = PreviousContext; 3833 3834 Destructor->setUsed(); 3835} 3836 3837void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3838 CXXMethodDecl *MethodDecl) { 3839 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3840 MethodDecl->getOverloadedOperator() == OO_Equal && 3841 !MethodDecl->isUsed()) && 3842 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3843 3844 CXXRecordDecl *ClassDecl 3845 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3846 3847 DeclContext *PreviousContext = CurContext; 3848 CurContext = MethodDecl; 3849 3850 // C++[class.copy] p12 3851 // Before the implicitly-declared copy assignment operator for a class is 3852 // implicitly defined, all implicitly-declared copy assignment operators 3853 // for its direct base classes and its nonstatic data members shall have 3854 // been implicitly defined. 3855 bool err = false; 3856 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3857 E = ClassDecl->bases_end(); Base != E; ++Base) { 3858 CXXRecordDecl *BaseClassDecl 3859 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3860 if (CXXMethodDecl *BaseAssignOpMethod = 3861 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3862 BaseClassDecl)) 3863 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3864 } 3865 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3866 E = ClassDecl->field_end(); Field != E; ++Field) { 3867 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3868 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3869 FieldType = Array->getElementType(); 3870 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3871 CXXRecordDecl *FieldClassDecl 3872 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3873 if (CXXMethodDecl *FieldAssignOpMethod = 3874 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3875 FieldClassDecl)) 3876 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3877 } else if (FieldType->isReferenceType()) { 3878 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3879 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3880 Diag(Field->getLocation(), diag::note_declared_at); 3881 Diag(CurrentLocation, diag::note_first_required_here); 3882 err = true; 3883 } else if (FieldType.isConstQualified()) { 3884 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3885 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3886 Diag(Field->getLocation(), diag::note_declared_at); 3887 Diag(CurrentLocation, diag::note_first_required_here); 3888 err = true; 3889 } 3890 } 3891 if (!err) 3892 MethodDecl->setUsed(); 3893 3894 CurContext = PreviousContext; 3895} 3896 3897CXXMethodDecl * 3898Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 3899 ParmVarDecl *ParmDecl, 3900 CXXRecordDecl *ClassDecl) { 3901 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3902 QualType RHSType(LHSType); 3903 // If class's assignment operator argument is const/volatile qualified, 3904 // look for operator = (const/volatile B&). Otherwise, look for 3905 // operator = (B&). 3906 RHSType = Context.getCVRQualifiedType(RHSType, 3907 ParmDecl->getType().getCVRQualifiers()); 3908 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3909 LHSType, 3910 SourceLocation())); 3911 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3912 RHSType, 3913 CurrentLocation)); 3914 Expr *Args[2] = { &*LHS, &*RHS }; 3915 OverloadCandidateSet CandidateSet(CurrentLocation); 3916 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3917 CandidateSet); 3918 OverloadCandidateSet::iterator Best; 3919 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 3920 return cast<CXXMethodDecl>(Best->Function); 3921 assert(false && 3922 "getAssignOperatorMethod - copy assignment operator method not found"); 3923 return 0; 3924} 3925 3926void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3927 CXXConstructorDecl *CopyConstructor, 3928 unsigned TypeQuals) { 3929 assert((CopyConstructor->isImplicit() && 3930 CopyConstructor->isCopyConstructor(TypeQuals) && 3931 !CopyConstructor->isUsed()) && 3932 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3933 3934 CXXRecordDecl *ClassDecl 3935 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3936 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3937 3938 DeclContext *PreviousContext = CurContext; 3939 CurContext = CopyConstructor; 3940 3941 // C++ [class.copy] p209 3942 // Before the implicitly-declared copy constructor for a class is 3943 // implicitly defined, all the implicitly-declared copy constructors 3944 // for its base class and its non-static data members shall have been 3945 // implicitly defined. 3946 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3947 Base != ClassDecl->bases_end(); ++Base) { 3948 CXXRecordDecl *BaseClassDecl 3949 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3950 if (CXXConstructorDecl *BaseCopyCtor = 3951 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 3952 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3953 } 3954 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3955 FieldEnd = ClassDecl->field_end(); 3956 Field != FieldEnd; ++Field) { 3957 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3958 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3959 FieldType = Array->getElementType(); 3960 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3961 CXXRecordDecl *FieldClassDecl 3962 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3963 if (CXXConstructorDecl *FieldCopyCtor = 3964 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 3965 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3966 } 3967 } 3968 CopyConstructor->setUsed(); 3969 3970 CurContext = PreviousContext; 3971} 3972 3973Sema::OwningExprResult 3974Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3975 CXXConstructorDecl *Constructor, 3976 MultiExprArg ExprArgs, 3977 bool RequiresZeroInit, 3978 bool BaseInitialization) { 3979 bool Elidable = false; 3980 3981 // C++ [class.copy]p15: 3982 // Whenever a temporary class object is copied using a copy constructor, and 3983 // this object and the copy have the same cv-unqualified type, an 3984 // implementation is permitted to treat the original and the copy as two 3985 // different ways of referring to the same object and not perform a copy at 3986 // all, even if the class copy constructor or destructor have side effects. 3987 3988 // FIXME: Is this enough? 3989 if (Constructor->isCopyConstructor()) { 3990 Expr *E = ((Expr **)ExprArgs.get())[0]; 3991 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3992 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3993 E = ICE->getSubExpr(); 3994 if (CXXFunctionalCastExpr *FCE = dyn_cast<CXXFunctionalCastExpr>(E)) 3995 E = FCE->getSubExpr(); 3996 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 3997 E = BE->getSubExpr(); 3998 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3999 if (ICE->getCastKind() == CastExpr::CK_NoOp) 4000 E = ICE->getSubExpr(); 4001 4002 if (CallExpr *CE = dyn_cast<CallExpr>(E)) 4003 Elidable = !CE->getCallReturnType()->isReferenceType(); 4004 else if (isa<CXXTemporaryObjectExpr>(E)) 4005 Elidable = true; 4006 else if (isa<CXXConstructExpr>(E)) 4007 Elidable = true; 4008 } 4009 4010 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4011 Elidable, move(ExprArgs), RequiresZeroInit, 4012 BaseInitialization); 4013} 4014 4015/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4016/// including handling of its default argument expressions. 4017Sema::OwningExprResult 4018Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4019 CXXConstructorDecl *Constructor, bool Elidable, 4020 MultiExprArg ExprArgs, 4021 bool RequiresZeroInit, 4022 bool BaseInitialization) { 4023 unsigned NumExprs = ExprArgs.size(); 4024 Expr **Exprs = (Expr **)ExprArgs.release(); 4025 4026 MarkDeclarationReferenced(ConstructLoc, Constructor); 4027 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4028 Constructor, Elidable, Exprs, NumExprs, 4029 RequiresZeroInit, BaseInitialization)); 4030} 4031 4032bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4033 CXXConstructorDecl *Constructor, 4034 MultiExprArg Exprs) { 4035 OwningExprResult TempResult = 4036 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4037 move(Exprs)); 4038 if (TempResult.isInvalid()) 4039 return true; 4040 4041 Expr *Temp = TempResult.takeAs<Expr>(); 4042 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4043 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4044 VD->setInit(Temp); 4045 4046 return false; 4047} 4048 4049void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4050 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4051 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4052 !ClassDecl->hasTrivialDestructor()) { 4053 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4054 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4055 CheckDestructorAccess(VD->getLocation(), Record); 4056 } 4057} 4058 4059/// AddCXXDirectInitializerToDecl - This action is called immediately after 4060/// ActOnDeclarator, when a C++ direct initializer is present. 4061/// e.g: "int x(1);" 4062void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4063 SourceLocation LParenLoc, 4064 MultiExprArg Exprs, 4065 SourceLocation *CommaLocs, 4066 SourceLocation RParenLoc) { 4067 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4068 Decl *RealDecl = Dcl.getAs<Decl>(); 4069 4070 // If there is no declaration, there was an error parsing it. Just ignore 4071 // the initializer. 4072 if (RealDecl == 0) 4073 return; 4074 4075 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4076 if (!VDecl) { 4077 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4078 RealDecl->setInvalidDecl(); 4079 return; 4080 } 4081 4082 // We will represent direct-initialization similarly to copy-initialization: 4083 // int x(1); -as-> int x = 1; 4084 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4085 // 4086 // Clients that want to distinguish between the two forms, can check for 4087 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4088 // A major benefit is that clients that don't particularly care about which 4089 // exactly form was it (like the CodeGen) can handle both cases without 4090 // special case code. 4091 4092 // C++ 8.5p11: 4093 // The form of initialization (using parentheses or '=') is generally 4094 // insignificant, but does matter when the entity being initialized has a 4095 // class type. 4096 QualType DeclInitType = VDecl->getType(); 4097 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4098 DeclInitType = Context.getBaseElementType(Array); 4099 4100 if (!VDecl->getType()->isDependentType() && 4101 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4102 diag::err_typecheck_decl_incomplete_type)) { 4103 VDecl->setInvalidDecl(); 4104 return; 4105 } 4106 4107 // The variable can not have an abstract class type. 4108 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4109 diag::err_abstract_type_in_decl, 4110 AbstractVariableType)) 4111 VDecl->setInvalidDecl(); 4112 4113 const VarDecl *Def; 4114 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4115 Diag(VDecl->getLocation(), diag::err_redefinition) 4116 << VDecl->getDeclName(); 4117 Diag(Def->getLocation(), diag::note_previous_definition); 4118 VDecl->setInvalidDecl(); 4119 return; 4120 } 4121 4122 // If either the declaration has a dependent type or if any of the 4123 // expressions is type-dependent, we represent the initialization 4124 // via a ParenListExpr for later use during template instantiation. 4125 if (VDecl->getType()->isDependentType() || 4126 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4127 // Let clients know that initialization was done with a direct initializer. 4128 VDecl->setCXXDirectInitializer(true); 4129 4130 // Store the initialization expressions as a ParenListExpr. 4131 unsigned NumExprs = Exprs.size(); 4132 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4133 (Expr **)Exprs.release(), 4134 NumExprs, RParenLoc)); 4135 return; 4136 } 4137 4138 // Capture the variable that is being initialized and the style of 4139 // initialization. 4140 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4141 4142 // FIXME: Poor source location information. 4143 InitializationKind Kind 4144 = InitializationKind::CreateDirect(VDecl->getLocation(), 4145 LParenLoc, RParenLoc); 4146 4147 InitializationSequence InitSeq(*this, Entity, Kind, 4148 (Expr**)Exprs.get(), Exprs.size()); 4149 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4150 if (Result.isInvalid()) { 4151 VDecl->setInvalidDecl(); 4152 return; 4153 } 4154 4155 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4156 VDecl->setInit(Result.takeAs<Expr>()); 4157 VDecl->setCXXDirectInitializer(true); 4158 4159 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4160 FinalizeVarWithDestructor(VDecl, Record); 4161} 4162 4163/// \brief Add the applicable constructor candidates for an initialization 4164/// by constructor. 4165static void AddConstructorInitializationCandidates(Sema &SemaRef, 4166 QualType ClassType, 4167 Expr **Args, 4168 unsigned NumArgs, 4169 InitializationKind Kind, 4170 OverloadCandidateSet &CandidateSet) { 4171 // C++ [dcl.init]p14: 4172 // If the initialization is direct-initialization, or if it is 4173 // copy-initialization where the cv-unqualified version of the 4174 // source type is the same class as, or a derived class of, the 4175 // class of the destination, constructors are considered. The 4176 // applicable constructors are enumerated (13.3.1.3), and the 4177 // best one is chosen through overload resolution (13.3). The 4178 // constructor so selected is called to initialize the object, 4179 // with the initializer expression(s) as its argument(s). If no 4180 // constructor applies, or the overload resolution is ambiguous, 4181 // the initialization is ill-formed. 4182 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 4183 assert(ClassRec && "Can only initialize a class type here"); 4184 4185 // FIXME: When we decide not to synthesize the implicitly-declared 4186 // constructors, we'll need to make them appear here. 4187 4188 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 4189 DeclarationName ConstructorName 4190 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 4191 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 4192 DeclContext::lookup_const_iterator Con, ConEnd; 4193 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 4194 Con != ConEnd; ++Con) { 4195 // Find the constructor (which may be a template). 4196 CXXConstructorDecl *Constructor = 0; 4197 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 4198 if (ConstructorTmpl) 4199 Constructor 4200 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 4201 else 4202 Constructor = cast<CXXConstructorDecl>(*Con); 4203 4204 if ((Kind.getKind() == InitializationKind::IK_Direct) || 4205 (Kind.getKind() == InitializationKind::IK_Value) || 4206 (Kind.getKind() == InitializationKind::IK_Copy && 4207 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 4208 ((Kind.getKind() == InitializationKind::IK_Default) && 4209 Constructor->isDefaultConstructor())) { 4210 if (ConstructorTmpl) 4211 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, 4212 ConstructorTmpl->getAccess(), 4213 /*ExplicitArgs*/ 0, 4214 Args, NumArgs, CandidateSet); 4215 else 4216 SemaRef.AddOverloadCandidate(Constructor, Constructor->getAccess(), 4217 Args, NumArgs, CandidateSet); 4218 } 4219 } 4220} 4221 4222/// \brief Attempt to perform initialization by constructor 4223/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 4224/// copy-initialization. 4225/// 4226/// This routine determines whether initialization by constructor is possible, 4227/// but it does not emit any diagnostics in the case where the initialization 4228/// is ill-formed. 4229/// 4230/// \param ClassType the type of the object being initialized, which must have 4231/// class type. 4232/// 4233/// \param Args the arguments provided to initialize the object 4234/// 4235/// \param NumArgs the number of arguments provided to initialize the object 4236/// 4237/// \param Kind the type of initialization being performed 4238/// 4239/// \returns the constructor used to initialize the object, if successful. 4240/// Otherwise, emits a diagnostic and returns NULL. 4241CXXConstructorDecl * 4242Sema::TryInitializationByConstructor(QualType ClassType, 4243 Expr **Args, unsigned NumArgs, 4244 SourceLocation Loc, 4245 InitializationKind Kind) { 4246 // Build the overload candidate set 4247 OverloadCandidateSet CandidateSet(Loc); 4248 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4249 CandidateSet); 4250 4251 // Determine whether we found a constructor we can use. 4252 OverloadCandidateSet::iterator Best; 4253 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4254 case OR_Success: 4255 case OR_Deleted: 4256 // We found a constructor. Return it. 4257 return cast<CXXConstructorDecl>(Best->Function); 4258 4259 case OR_No_Viable_Function: 4260 case OR_Ambiguous: 4261 // Overload resolution failed. Return nothing. 4262 return 0; 4263 } 4264 4265 // Silence GCC warning 4266 return 0; 4267} 4268 4269/// \brief Given a constructor and the set of arguments provided for the 4270/// constructor, convert the arguments and add any required default arguments 4271/// to form a proper call to this constructor. 4272/// 4273/// \returns true if an error occurred, false otherwise. 4274bool 4275Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4276 MultiExprArg ArgsPtr, 4277 SourceLocation Loc, 4278 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4279 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4280 unsigned NumArgs = ArgsPtr.size(); 4281 Expr **Args = (Expr **)ArgsPtr.get(); 4282 4283 const FunctionProtoType *Proto 4284 = Constructor->getType()->getAs<FunctionProtoType>(); 4285 assert(Proto && "Constructor without a prototype?"); 4286 unsigned NumArgsInProto = Proto->getNumArgs(); 4287 4288 // If too few arguments are available, we'll fill in the rest with defaults. 4289 if (NumArgs < NumArgsInProto) 4290 ConvertedArgs.reserve(NumArgsInProto); 4291 else 4292 ConvertedArgs.reserve(NumArgs); 4293 4294 VariadicCallType CallType = 4295 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4296 llvm::SmallVector<Expr *, 8> AllArgs; 4297 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4298 Proto, 0, Args, NumArgs, AllArgs, 4299 CallType); 4300 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4301 ConvertedArgs.push_back(AllArgs[i]); 4302 return Invalid; 4303} 4304 4305/// CompareReferenceRelationship - Compare the two types T1 and T2 to 4306/// determine whether they are reference-related, 4307/// reference-compatible, reference-compatible with added 4308/// qualification, or incompatible, for use in C++ initialization by 4309/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 4310/// type, and the first type (T1) is the pointee type of the reference 4311/// type being initialized. 4312Sema::ReferenceCompareResult 4313Sema::CompareReferenceRelationship(SourceLocation Loc, 4314 QualType OrigT1, QualType OrigT2, 4315 bool& DerivedToBase) { 4316 assert(!OrigT1->isReferenceType() && 4317 "T1 must be the pointee type of the reference type"); 4318 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 4319 4320 QualType T1 = Context.getCanonicalType(OrigT1); 4321 QualType T2 = Context.getCanonicalType(OrigT2); 4322 Qualifiers T1Quals, T2Quals; 4323 QualType UnqualT1 = Context.getUnqualifiedArrayType(T1, T1Quals); 4324 QualType UnqualT2 = Context.getUnqualifiedArrayType(T2, T2Quals); 4325 4326 // C++ [dcl.init.ref]p4: 4327 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 4328 // reference-related to "cv2 T2" if T1 is the same type as T2, or 4329 // T1 is a base class of T2. 4330 if (UnqualT1 == UnqualT2) 4331 DerivedToBase = false; 4332 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 4333 !RequireCompleteType(Loc, OrigT2, PDiag()) && 4334 IsDerivedFrom(UnqualT2, UnqualT1)) 4335 DerivedToBase = true; 4336 else 4337 return Ref_Incompatible; 4338 4339 // At this point, we know that T1 and T2 are reference-related (at 4340 // least). 4341 4342 // If the type is an array type, promote the element qualifiers to the type 4343 // for comparison. 4344 if (isa<ArrayType>(T1) && T1Quals) 4345 T1 = Context.getQualifiedType(UnqualT1, T1Quals); 4346 if (isa<ArrayType>(T2) && T2Quals) 4347 T2 = Context.getQualifiedType(UnqualT2, T2Quals); 4348 4349 // C++ [dcl.init.ref]p4: 4350 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 4351 // reference-related to T2 and cv1 is the same cv-qualification 4352 // as, or greater cv-qualification than, cv2. For purposes of 4353 // overload resolution, cases for which cv1 is greater 4354 // cv-qualification than cv2 are identified as 4355 // reference-compatible with added qualification (see 13.3.3.2). 4356 if (T1Quals.getCVRQualifiers() == T2Quals.getCVRQualifiers()) 4357 return Ref_Compatible; 4358 else if (T1.isMoreQualifiedThan(T2)) 4359 return Ref_Compatible_With_Added_Qualification; 4360 else 4361 return Ref_Related; 4362} 4363 4364/// CheckReferenceInit - Check the initialization of a reference 4365/// variable with the given initializer (C++ [dcl.init.ref]). Init is 4366/// the initializer (either a simple initializer or an initializer 4367/// list), and DeclType is the type of the declaration. When ICS is 4368/// non-null, this routine will compute the implicit conversion 4369/// sequence according to C++ [over.ics.ref] and will not produce any 4370/// diagnostics; when ICS is null, it will emit diagnostics when any 4371/// errors are found. Either way, a return value of true indicates 4372/// that there was a failure, a return value of false indicates that 4373/// the reference initialization succeeded. 4374/// 4375/// When @p SuppressUserConversions, user-defined conversions are 4376/// suppressed. 4377/// When @p AllowExplicit, we also permit explicit user-defined 4378/// conversion functions. 4379/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 4380/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 4381/// This is used when this is called from a C-style cast. 4382bool 4383Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 4384 SourceLocation DeclLoc, 4385 bool SuppressUserConversions, 4386 bool AllowExplicit, bool ForceRValue, 4387 ImplicitConversionSequence *ICS, 4388 bool IgnoreBaseAccess) { 4389 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 4390 4391 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 4392 QualType T2 = Init->getType(); 4393 4394 // If the initializer is the address of an overloaded function, try 4395 // to resolve the overloaded function. If all goes well, T2 is the 4396 // type of the resulting function. 4397 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 4398 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 4399 ICS != 0); 4400 if (Fn) { 4401 // Since we're performing this reference-initialization for 4402 // real, update the initializer with the resulting function. 4403 if (!ICS) { 4404 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 4405 return true; 4406 4407 Init = FixOverloadedFunctionReference(Init, Fn); 4408 } 4409 4410 T2 = Fn->getType(); 4411 } 4412 } 4413 4414 // Compute some basic properties of the types and the initializer. 4415 bool isRValRef = DeclType->isRValueReferenceType(); 4416 bool DerivedToBase = false; 4417 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 4418 Init->isLvalue(Context); 4419 ReferenceCompareResult RefRelationship 4420 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 4421 4422 // Most paths end in a failed conversion. 4423 if (ICS) { 4424 ICS->setBad(BadConversionSequence::no_conversion, Init, DeclType); 4425 } 4426 4427 // C++ [dcl.init.ref]p5: 4428 // A reference to type "cv1 T1" is initialized by an expression 4429 // of type "cv2 T2" as follows: 4430 4431 // -- If the initializer expression 4432 4433 // Rvalue references cannot bind to lvalues (N2812). 4434 // There is absolutely no situation where they can. In particular, note that 4435 // this is ill-formed, even if B has a user-defined conversion to A&&: 4436 // B b; 4437 // A&& r = b; 4438 if (isRValRef && InitLvalue == Expr::LV_Valid) { 4439 if (!ICS) 4440 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4441 << Init->getSourceRange(); 4442 return true; 4443 } 4444 4445 bool BindsDirectly = false; 4446 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 4447 // reference-compatible with "cv2 T2," or 4448 // 4449 // Note that the bit-field check is skipped if we are just computing 4450 // the implicit conversion sequence (C++ [over.best.ics]p2). 4451 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 4452 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4453 BindsDirectly = true; 4454 4455 if (ICS) { 4456 // C++ [over.ics.ref]p1: 4457 // When a parameter of reference type binds directly (8.5.3) 4458 // to an argument expression, the implicit conversion sequence 4459 // is the identity conversion, unless the argument expression 4460 // has a type that is a derived class of the parameter type, 4461 // in which case the implicit conversion sequence is a 4462 // derived-to-base Conversion (13.3.3.1). 4463 ICS->setStandard(); 4464 ICS->Standard.First = ICK_Identity; 4465 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4466 ICS->Standard.Third = ICK_Identity; 4467 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4468 ICS->Standard.setToType(0, T2); 4469 ICS->Standard.setToType(1, T1); 4470 ICS->Standard.setToType(2, T1); 4471 ICS->Standard.ReferenceBinding = true; 4472 ICS->Standard.DirectBinding = true; 4473 ICS->Standard.RRefBinding = false; 4474 ICS->Standard.CopyConstructor = 0; 4475 4476 // Nothing more to do: the inaccessibility/ambiguity check for 4477 // derived-to-base conversions is suppressed when we're 4478 // computing the implicit conversion sequence (C++ 4479 // [over.best.ics]p2). 4480 return false; 4481 } else { 4482 // Perform the conversion. 4483 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4484 if (DerivedToBase) 4485 CK = CastExpr::CK_DerivedToBase; 4486 else if(CheckExceptionSpecCompatibility(Init, T1)) 4487 return true; 4488 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 4489 } 4490 } 4491 4492 // -- has a class type (i.e., T2 is a class type) and can be 4493 // implicitly converted to an lvalue of type "cv3 T3," 4494 // where "cv1 T1" is reference-compatible with "cv3 T3" 4495 // 92) (this conversion is selected by enumerating the 4496 // applicable conversion functions (13.3.1.6) and choosing 4497 // the best one through overload resolution (13.3)), 4498 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 4499 !RequireCompleteType(DeclLoc, T2, 0)) { 4500 CXXRecordDecl *T2RecordDecl 4501 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 4502 4503 OverloadCandidateSet CandidateSet(DeclLoc); 4504 const UnresolvedSetImpl *Conversions 4505 = T2RecordDecl->getVisibleConversionFunctions(); 4506 for (UnresolvedSetImpl::iterator I = Conversions->begin(), 4507 E = Conversions->end(); I != E; ++I) { 4508 NamedDecl *D = *I; 4509 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); 4510 if (isa<UsingShadowDecl>(D)) 4511 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 4512 4513 FunctionTemplateDecl *ConvTemplate 4514 = dyn_cast<FunctionTemplateDecl>(D); 4515 CXXConversionDecl *Conv; 4516 if (ConvTemplate) 4517 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 4518 else 4519 Conv = cast<CXXConversionDecl>(D); 4520 4521 // If the conversion function doesn't return a reference type, 4522 // it can't be considered for this conversion. 4523 if (Conv->getConversionType()->isLValueReferenceType() && 4524 (AllowExplicit || !Conv->isExplicit())) { 4525 if (ConvTemplate) 4526 AddTemplateConversionCandidate(ConvTemplate, I.getAccess(), ActingDC, 4527 Init, DeclType, CandidateSet); 4528 else 4529 AddConversionCandidate(Conv, I.getAccess(), ActingDC, Init, 4530 DeclType, CandidateSet); 4531 } 4532 } 4533 4534 OverloadCandidateSet::iterator Best; 4535 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 4536 case OR_Success: 4537 // C++ [over.ics.ref]p1: 4538 // 4539 // [...] If the parameter binds directly to the result of 4540 // applying a conversion function to the argument 4541 // expression, the implicit conversion sequence is a 4542 // user-defined conversion sequence (13.3.3.1.2), with the 4543 // second standard conversion sequence either an identity 4544 // conversion or, if the conversion function returns an 4545 // entity of a type that is a derived class of the parameter 4546 // type, a derived-to-base Conversion. 4547 if (!Best->FinalConversion.DirectBinding) 4548 break; 4549 4550 // This is a direct binding. 4551 BindsDirectly = true; 4552 4553 if (ICS) { 4554 ICS->setUserDefined(); 4555 ICS->UserDefined.Before = Best->Conversions[0].Standard; 4556 ICS->UserDefined.After = Best->FinalConversion; 4557 ICS->UserDefined.ConversionFunction = Best->Function; 4558 ICS->UserDefined.EllipsisConversion = false; 4559 assert(ICS->UserDefined.After.ReferenceBinding && 4560 ICS->UserDefined.After.DirectBinding && 4561 "Expected a direct reference binding!"); 4562 return false; 4563 } else { 4564 OwningExprResult InitConversion = 4565 BuildCXXCastArgument(DeclLoc, QualType(), 4566 CastExpr::CK_UserDefinedConversion, 4567 cast<CXXMethodDecl>(Best->Function), 4568 Owned(Init)); 4569 Init = InitConversion.takeAs<Expr>(); 4570 4571 if (CheckExceptionSpecCompatibility(Init, T1)) 4572 return true; 4573 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 4574 /*isLvalue=*/true); 4575 } 4576 break; 4577 4578 case OR_Ambiguous: 4579 if (ICS) { 4580 ICS->setAmbiguous(); 4581 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 4582 Cand != CandidateSet.end(); ++Cand) 4583 if (Cand->Viable) 4584 ICS->Ambiguous.addConversion(Cand->Function); 4585 break; 4586 } 4587 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 4588 << Init->getSourceRange(); 4589 PrintOverloadCandidates(CandidateSet, OCD_ViableCandidates, &Init, 1); 4590 return true; 4591 4592 case OR_No_Viable_Function: 4593 case OR_Deleted: 4594 // There was no suitable conversion, or we found a deleted 4595 // conversion; continue with other checks. 4596 break; 4597 } 4598 } 4599 4600 if (BindsDirectly) { 4601 // C++ [dcl.init.ref]p4: 4602 // [...] In all cases where the reference-related or 4603 // reference-compatible relationship of two types is used to 4604 // establish the validity of a reference binding, and T1 is a 4605 // base class of T2, a program that necessitates such a binding 4606 // is ill-formed if T1 is an inaccessible (clause 11) or 4607 // ambiguous (10.2) base class of T2. 4608 // 4609 // Note that we only check this condition when we're allowed to 4610 // complain about errors, because we should not be checking for 4611 // ambiguity (or inaccessibility) unless the reference binding 4612 // actually happens. 4613 if (DerivedToBase) 4614 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 4615 Init->getSourceRange(), 4616 IgnoreBaseAccess); 4617 else 4618 return false; 4619 } 4620 4621 // -- Otherwise, the reference shall be to a non-volatile const 4622 // type (i.e., cv1 shall be const), or the reference shall be an 4623 // rvalue reference and the initializer expression shall be an rvalue. 4624 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4625 if (!ICS) 4626 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4627 << T1.isVolatileQualified() 4628 << T1 << int(InitLvalue != Expr::LV_Valid) 4629 << T2 << Init->getSourceRange(); 4630 return true; 4631 } 4632 4633 // -- If the initializer expression is an rvalue, with T2 a 4634 // class type, and "cv1 T1" is reference-compatible with 4635 // "cv2 T2," the reference is bound in one of the 4636 // following ways (the choice is implementation-defined): 4637 // 4638 // -- The reference is bound to the object represented by 4639 // the rvalue (see 3.10) or to a sub-object within that 4640 // object. 4641 // 4642 // -- A temporary of type "cv1 T2" [sic] is created, and 4643 // a constructor is called to copy the entire rvalue 4644 // object into the temporary. The reference is bound to 4645 // the temporary or to a sub-object within the 4646 // temporary. 4647 // 4648 // The constructor that would be used to make the copy 4649 // shall be callable whether or not the copy is actually 4650 // done. 4651 // 4652 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4653 // freedom, so we will always take the first option and never build 4654 // a temporary in this case. FIXME: We will, however, have to check 4655 // for the presence of a copy constructor in C++98/03 mode. 4656 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4657 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4658 if (ICS) { 4659 ICS->setStandard(); 4660 ICS->Standard.First = ICK_Identity; 4661 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4662 ICS->Standard.Third = ICK_Identity; 4663 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4664 ICS->Standard.setToType(0, T2); 4665 ICS->Standard.setToType(1, T1); 4666 ICS->Standard.setToType(2, T1); 4667 ICS->Standard.ReferenceBinding = true; 4668 ICS->Standard.DirectBinding = false; 4669 ICS->Standard.RRefBinding = isRValRef; 4670 ICS->Standard.CopyConstructor = 0; 4671 } else { 4672 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4673 if (DerivedToBase) 4674 CK = CastExpr::CK_DerivedToBase; 4675 else if(CheckExceptionSpecCompatibility(Init, T1)) 4676 return true; 4677 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4678 } 4679 return false; 4680 } 4681 4682 // -- Otherwise, a temporary of type "cv1 T1" is created and 4683 // initialized from the initializer expression using the 4684 // rules for a non-reference copy initialization (8.5). The 4685 // reference is then bound to the temporary. If T1 is 4686 // reference-related to T2, cv1 must be the same 4687 // cv-qualification as, or greater cv-qualification than, 4688 // cv2; otherwise, the program is ill-formed. 4689 if (RefRelationship == Ref_Related) { 4690 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4691 // we would be reference-compatible or reference-compatible with 4692 // added qualification. But that wasn't the case, so the reference 4693 // initialization fails. 4694 if (!ICS) 4695 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4696 << T1 << int(InitLvalue != Expr::LV_Valid) 4697 << T2 << Init->getSourceRange(); 4698 return true; 4699 } 4700 4701 // If at least one of the types is a class type, the types are not 4702 // related, and we aren't allowed any user conversions, the 4703 // reference binding fails. This case is important for breaking 4704 // recursion, since TryImplicitConversion below will attempt to 4705 // create a temporary through the use of a copy constructor. 4706 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4707 (T1->isRecordType() || T2->isRecordType())) { 4708 if (!ICS) 4709 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4710 << DeclType << Init->getType() << AA_Initializing << Init->getSourceRange(); 4711 return true; 4712 } 4713 4714 // Actually try to convert the initializer to T1. 4715 if (ICS) { 4716 // C++ [over.ics.ref]p2: 4717 // 4718 // When a parameter of reference type is not bound directly to 4719 // an argument expression, the conversion sequence is the one 4720 // required to convert the argument expression to the 4721 // underlying type of the reference according to 4722 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4723 // to copy-initializing a temporary of the underlying type with 4724 // the argument expression. Any difference in top-level 4725 // cv-qualification is subsumed by the initialization itself 4726 // and does not constitute a conversion. 4727 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4728 /*AllowExplicit=*/false, 4729 /*ForceRValue=*/false, 4730 /*InOverloadResolution=*/false); 4731 4732 // Of course, that's still a reference binding. 4733 if (ICS->isStandard()) { 4734 ICS->Standard.ReferenceBinding = true; 4735 ICS->Standard.RRefBinding = isRValRef; 4736 } else if (ICS->isUserDefined()) { 4737 ICS->UserDefined.After.ReferenceBinding = true; 4738 ICS->UserDefined.After.RRefBinding = isRValRef; 4739 } 4740 return ICS->isBad(); 4741 } else { 4742 ImplicitConversionSequence Conversions; 4743 bool badConversion = PerformImplicitConversion(Init, T1, AA_Initializing, 4744 false, false, 4745 Conversions); 4746 if (badConversion) { 4747 if (Conversions.isAmbiguous()) { 4748 Diag(DeclLoc, 4749 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4750 for (int j = Conversions.Ambiguous.conversions().size()-1; 4751 j >= 0; j--) { 4752 FunctionDecl *Func = Conversions.Ambiguous.conversions()[j]; 4753 NoteOverloadCandidate(Func); 4754 } 4755 } 4756 else { 4757 if (isRValRef) 4758 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4759 << Init->getSourceRange(); 4760 else 4761 Diag(DeclLoc, diag::err_invalid_initialization) 4762 << DeclType << Init->getType() << Init->getSourceRange(); 4763 } 4764 } 4765 return badConversion; 4766 } 4767} 4768 4769static inline bool 4770CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4771 const FunctionDecl *FnDecl) { 4772 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4773 if (isa<NamespaceDecl>(DC)) { 4774 return SemaRef.Diag(FnDecl->getLocation(), 4775 diag::err_operator_new_delete_declared_in_namespace) 4776 << FnDecl->getDeclName(); 4777 } 4778 4779 if (isa<TranslationUnitDecl>(DC) && 4780 FnDecl->getStorageClass() == FunctionDecl::Static) { 4781 return SemaRef.Diag(FnDecl->getLocation(), 4782 diag::err_operator_new_delete_declared_static) 4783 << FnDecl->getDeclName(); 4784 } 4785 4786 return false; 4787} 4788 4789static inline bool 4790CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4791 CanQualType ExpectedResultType, 4792 CanQualType ExpectedFirstParamType, 4793 unsigned DependentParamTypeDiag, 4794 unsigned InvalidParamTypeDiag) { 4795 QualType ResultType = 4796 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4797 4798 // Check that the result type is not dependent. 4799 if (ResultType->isDependentType()) 4800 return SemaRef.Diag(FnDecl->getLocation(), 4801 diag::err_operator_new_delete_dependent_result_type) 4802 << FnDecl->getDeclName() << ExpectedResultType; 4803 4804 // Check that the result type is what we expect. 4805 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4806 return SemaRef.Diag(FnDecl->getLocation(), 4807 diag::err_operator_new_delete_invalid_result_type) 4808 << FnDecl->getDeclName() << ExpectedResultType; 4809 4810 // A function template must have at least 2 parameters. 4811 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4812 return SemaRef.Diag(FnDecl->getLocation(), 4813 diag::err_operator_new_delete_template_too_few_parameters) 4814 << FnDecl->getDeclName(); 4815 4816 // The function decl must have at least 1 parameter. 4817 if (FnDecl->getNumParams() == 0) 4818 return SemaRef.Diag(FnDecl->getLocation(), 4819 diag::err_operator_new_delete_too_few_parameters) 4820 << FnDecl->getDeclName(); 4821 4822 // Check the the first parameter type is not dependent. 4823 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4824 if (FirstParamType->isDependentType()) 4825 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4826 << FnDecl->getDeclName() << ExpectedFirstParamType; 4827 4828 // Check that the first parameter type is what we expect. 4829 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4830 ExpectedFirstParamType) 4831 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4832 << FnDecl->getDeclName() << ExpectedFirstParamType; 4833 4834 return false; 4835} 4836 4837static bool 4838CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4839 // C++ [basic.stc.dynamic.allocation]p1: 4840 // A program is ill-formed if an allocation function is declared in a 4841 // namespace scope other than global scope or declared static in global 4842 // scope. 4843 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4844 return true; 4845 4846 CanQualType SizeTy = 4847 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4848 4849 // C++ [basic.stc.dynamic.allocation]p1: 4850 // The return type shall be void*. The first parameter shall have type 4851 // std::size_t. 4852 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4853 SizeTy, 4854 diag::err_operator_new_dependent_param_type, 4855 diag::err_operator_new_param_type)) 4856 return true; 4857 4858 // C++ [basic.stc.dynamic.allocation]p1: 4859 // The first parameter shall not have an associated default argument. 4860 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4861 return SemaRef.Diag(FnDecl->getLocation(), 4862 diag::err_operator_new_default_arg) 4863 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4864 4865 return false; 4866} 4867 4868static bool 4869CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4870 // C++ [basic.stc.dynamic.deallocation]p1: 4871 // A program is ill-formed if deallocation functions are declared in a 4872 // namespace scope other than global scope or declared static in global 4873 // scope. 4874 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4875 return true; 4876 4877 // C++ [basic.stc.dynamic.deallocation]p2: 4878 // Each deallocation function shall return void and its first parameter 4879 // shall be void*. 4880 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4881 SemaRef.Context.VoidPtrTy, 4882 diag::err_operator_delete_dependent_param_type, 4883 diag::err_operator_delete_param_type)) 4884 return true; 4885 4886 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4887 if (FirstParamType->isDependentType()) 4888 return SemaRef.Diag(FnDecl->getLocation(), 4889 diag::err_operator_delete_dependent_param_type) 4890 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4891 4892 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4893 SemaRef.Context.VoidPtrTy) 4894 return SemaRef.Diag(FnDecl->getLocation(), 4895 diag::err_operator_delete_param_type) 4896 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4897 4898 return false; 4899} 4900 4901/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4902/// of this overloaded operator is well-formed. If so, returns false; 4903/// otherwise, emits appropriate diagnostics and returns true. 4904bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4905 assert(FnDecl && FnDecl->isOverloadedOperator() && 4906 "Expected an overloaded operator declaration"); 4907 4908 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4909 4910 // C++ [over.oper]p5: 4911 // The allocation and deallocation functions, operator new, 4912 // operator new[], operator delete and operator delete[], are 4913 // described completely in 3.7.3. The attributes and restrictions 4914 // found in the rest of this subclause do not apply to them unless 4915 // explicitly stated in 3.7.3. 4916 if (Op == OO_Delete || Op == OO_Array_Delete) 4917 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4918 4919 if (Op == OO_New || Op == OO_Array_New) 4920 return CheckOperatorNewDeclaration(*this, FnDecl); 4921 4922 // C++ [over.oper]p6: 4923 // An operator function shall either be a non-static member 4924 // function or be a non-member function and have at least one 4925 // parameter whose type is a class, a reference to a class, an 4926 // enumeration, or a reference to an enumeration. 4927 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4928 if (MethodDecl->isStatic()) 4929 return Diag(FnDecl->getLocation(), 4930 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4931 } else { 4932 bool ClassOrEnumParam = false; 4933 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4934 ParamEnd = FnDecl->param_end(); 4935 Param != ParamEnd; ++Param) { 4936 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4937 if (ParamType->isDependentType() || ParamType->isRecordType() || 4938 ParamType->isEnumeralType()) { 4939 ClassOrEnumParam = true; 4940 break; 4941 } 4942 } 4943 4944 if (!ClassOrEnumParam) 4945 return Diag(FnDecl->getLocation(), 4946 diag::err_operator_overload_needs_class_or_enum) 4947 << FnDecl->getDeclName(); 4948 } 4949 4950 // C++ [over.oper]p8: 4951 // An operator function cannot have default arguments (8.3.6), 4952 // except where explicitly stated below. 4953 // 4954 // Only the function-call operator allows default arguments 4955 // (C++ [over.call]p1). 4956 if (Op != OO_Call) { 4957 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4958 Param != FnDecl->param_end(); ++Param) { 4959 if ((*Param)->hasDefaultArg()) 4960 return Diag((*Param)->getLocation(), 4961 diag::err_operator_overload_default_arg) 4962 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4963 } 4964 } 4965 4966 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4967 { false, false, false } 4968#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4969 , { Unary, Binary, MemberOnly } 4970#include "clang/Basic/OperatorKinds.def" 4971 }; 4972 4973 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4974 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4975 bool MustBeMemberOperator = OperatorUses[Op][2]; 4976 4977 // C++ [over.oper]p8: 4978 // [...] Operator functions cannot have more or fewer parameters 4979 // than the number required for the corresponding operator, as 4980 // described in the rest of this subclause. 4981 unsigned NumParams = FnDecl->getNumParams() 4982 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4983 if (Op != OO_Call && 4984 ((NumParams == 1 && !CanBeUnaryOperator) || 4985 (NumParams == 2 && !CanBeBinaryOperator) || 4986 (NumParams < 1) || (NumParams > 2))) { 4987 // We have the wrong number of parameters. 4988 unsigned ErrorKind; 4989 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4990 ErrorKind = 2; // 2 -> unary or binary. 4991 } else if (CanBeUnaryOperator) { 4992 ErrorKind = 0; // 0 -> unary 4993 } else { 4994 assert(CanBeBinaryOperator && 4995 "All non-call overloaded operators are unary or binary!"); 4996 ErrorKind = 1; // 1 -> binary 4997 } 4998 4999 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5000 << FnDecl->getDeclName() << NumParams << ErrorKind; 5001 } 5002 5003 // Overloaded operators other than operator() cannot be variadic. 5004 if (Op != OO_Call && 5005 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5006 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5007 << FnDecl->getDeclName(); 5008 } 5009 5010 // Some operators must be non-static member functions. 5011 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5012 return Diag(FnDecl->getLocation(), 5013 diag::err_operator_overload_must_be_member) 5014 << FnDecl->getDeclName(); 5015 } 5016 5017 // C++ [over.inc]p1: 5018 // The user-defined function called operator++ implements the 5019 // prefix and postfix ++ operator. If this function is a member 5020 // function with no parameters, or a non-member function with one 5021 // parameter of class or enumeration type, it defines the prefix 5022 // increment operator ++ for objects of that type. If the function 5023 // is a member function with one parameter (which shall be of type 5024 // int) or a non-member function with two parameters (the second 5025 // of which shall be of type int), it defines the postfix 5026 // increment operator ++ for objects of that type. 5027 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5028 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5029 bool ParamIsInt = false; 5030 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5031 ParamIsInt = BT->getKind() == BuiltinType::Int; 5032 5033 if (!ParamIsInt) 5034 return Diag(LastParam->getLocation(), 5035 diag::err_operator_overload_post_incdec_must_be_int) 5036 << LastParam->getType() << (Op == OO_MinusMinus); 5037 } 5038 5039 // Notify the class if it got an assignment operator. 5040 if (Op == OO_Equal) { 5041 // Would have returned earlier otherwise. 5042 assert(isa<CXXMethodDecl>(FnDecl) && 5043 "Overloaded = not member, but not filtered."); 5044 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5045 Method->getParent()->addedAssignmentOperator(Context, Method); 5046 } 5047 5048 return false; 5049} 5050 5051/// CheckLiteralOperatorDeclaration - Check whether the declaration 5052/// of this literal operator function is well-formed. If so, returns 5053/// false; otherwise, emits appropriate diagnostics and returns true. 5054bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5055 DeclContext *DC = FnDecl->getDeclContext(); 5056 Decl::Kind Kind = DC->getDeclKind(); 5057 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5058 Kind != Decl::LinkageSpec) { 5059 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5060 << FnDecl->getDeclName(); 5061 return true; 5062 } 5063 5064 bool Valid = false; 5065 5066 // FIXME: Check for the one valid template signature 5067 // template <char...> type operator "" name(); 5068 5069 if (FunctionDecl::param_iterator Param = FnDecl->param_begin()) { 5070 // Check the first parameter 5071 QualType T = (*Param)->getType(); 5072 5073 // unsigned long long int and long double are allowed, but only 5074 // alone. 5075 // We also allow any character type; their omission seems to be a bug 5076 // in n3000 5077 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5078 Context.hasSameType(T, Context.LongDoubleTy) || 5079 Context.hasSameType(T, Context.CharTy) || 5080 Context.hasSameType(T, Context.WCharTy) || 5081 Context.hasSameType(T, Context.Char16Ty) || 5082 Context.hasSameType(T, Context.Char32Ty)) { 5083 if (++Param == FnDecl->param_end()) 5084 Valid = true; 5085 goto FinishedParams; 5086 } 5087 5088 // Otherwise it must be a pointer to const; let's strip those. 5089 const PointerType *PT = T->getAs<PointerType>(); 5090 if (!PT) 5091 goto FinishedParams; 5092 T = PT->getPointeeType(); 5093 if (!T.isConstQualified()) 5094 goto FinishedParams; 5095 T = T.getUnqualifiedType(); 5096 5097 // Move on to the second parameter; 5098 ++Param; 5099 5100 // If there is no second parameter, the first must be a const char * 5101 if (Param == FnDecl->param_end()) { 5102 if (Context.hasSameType(T, Context.CharTy)) 5103 Valid = true; 5104 goto FinishedParams; 5105 } 5106 5107 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5108 // are allowed as the first parameter to a two-parameter function 5109 if (!(Context.hasSameType(T, Context.CharTy) || 5110 Context.hasSameType(T, Context.WCharTy) || 5111 Context.hasSameType(T, Context.Char16Ty) || 5112 Context.hasSameType(T, Context.Char32Ty))) 5113 goto FinishedParams; 5114 5115 // The second and final parameter must be an std::size_t 5116 T = (*Param)->getType().getUnqualifiedType(); 5117 if (Context.hasSameType(T, Context.getSizeType()) && 5118 ++Param == FnDecl->param_end()) 5119 Valid = true; 5120 } 5121 5122 // FIXME: This diagnostic is absolutely terrible. 5123FinishedParams: 5124 if (!Valid) { 5125 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5126 << FnDecl->getDeclName(); 5127 return true; 5128 } 5129 5130 return false; 5131} 5132 5133/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5134/// linkage specification, including the language and (if present) 5135/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5136/// the location of the language string literal, which is provided 5137/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5138/// the '{' brace. Otherwise, this linkage specification does not 5139/// have any braces. 5140Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5141 SourceLocation ExternLoc, 5142 SourceLocation LangLoc, 5143 const char *Lang, 5144 unsigned StrSize, 5145 SourceLocation LBraceLoc) { 5146 LinkageSpecDecl::LanguageIDs Language; 5147 if (strncmp(Lang, "\"C\"", StrSize) == 0) 5148 Language = LinkageSpecDecl::lang_c; 5149 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 5150 Language = LinkageSpecDecl::lang_cxx; 5151 else { 5152 Diag(LangLoc, diag::err_bad_language); 5153 return DeclPtrTy(); 5154 } 5155 5156 // FIXME: Add all the various semantics of linkage specifications 5157 5158 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5159 LangLoc, Language, 5160 LBraceLoc.isValid()); 5161 CurContext->addDecl(D); 5162 PushDeclContext(S, D); 5163 return DeclPtrTy::make(D); 5164} 5165 5166/// ActOnFinishLinkageSpecification - Completely the definition of 5167/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5168/// valid, it's the position of the closing '}' brace in a linkage 5169/// specification that uses braces. 5170Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5171 DeclPtrTy LinkageSpec, 5172 SourceLocation RBraceLoc) { 5173 if (LinkageSpec) 5174 PopDeclContext(); 5175 return LinkageSpec; 5176} 5177 5178/// \brief Perform semantic analysis for the variable declaration that 5179/// occurs within a C++ catch clause, returning the newly-created 5180/// variable. 5181VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5182 TypeSourceInfo *TInfo, 5183 IdentifierInfo *Name, 5184 SourceLocation Loc, 5185 SourceRange Range) { 5186 bool Invalid = false; 5187 5188 // Arrays and functions decay. 5189 if (ExDeclType->isArrayType()) 5190 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5191 else if (ExDeclType->isFunctionType()) 5192 ExDeclType = Context.getPointerType(ExDeclType); 5193 5194 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5195 // The exception-declaration shall not denote a pointer or reference to an 5196 // incomplete type, other than [cv] void*. 5197 // N2844 forbids rvalue references. 5198 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5199 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5200 Invalid = true; 5201 } 5202 5203 // GCC allows catching pointers and references to incomplete types 5204 // as an extension; so do we, but we warn by default. 5205 5206 QualType BaseType = ExDeclType; 5207 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5208 unsigned DK = diag::err_catch_incomplete; 5209 bool IncompleteCatchIsInvalid = true; 5210 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5211 BaseType = Ptr->getPointeeType(); 5212 Mode = 1; 5213 DK = diag::ext_catch_incomplete_ptr; 5214 IncompleteCatchIsInvalid = false; 5215 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5216 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5217 BaseType = Ref->getPointeeType(); 5218 Mode = 2; 5219 DK = diag::ext_catch_incomplete_ref; 5220 IncompleteCatchIsInvalid = false; 5221 } 5222 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5223 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5224 IncompleteCatchIsInvalid) 5225 Invalid = true; 5226 5227 if (!Invalid && !ExDeclType->isDependentType() && 5228 RequireNonAbstractType(Loc, ExDeclType, 5229 diag::err_abstract_type_in_decl, 5230 AbstractVariableType)) 5231 Invalid = true; 5232 5233 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5234 Name, ExDeclType, TInfo, VarDecl::None); 5235 5236 if (!Invalid) { 5237 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5238 // C++ [except.handle]p16: 5239 // The object declared in an exception-declaration or, if the 5240 // exception-declaration does not specify a name, a temporary (12.2) is 5241 // copy-initialized (8.5) from the exception object. [...] 5242 // The object is destroyed when the handler exits, after the destruction 5243 // of any automatic objects initialized within the handler. 5244 // 5245 // We just pretend to initialize the object with itself, then make sure 5246 // it can be destroyed later. 5247 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5248 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5249 Loc, ExDeclType, 0); 5250 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5251 SourceLocation()); 5252 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5253 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5254 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5255 if (Result.isInvalid()) 5256 Invalid = true; 5257 else 5258 FinalizeVarWithDestructor(ExDecl, RecordTy); 5259 } 5260 } 5261 5262 if (Invalid) 5263 ExDecl->setInvalidDecl(); 5264 5265 return ExDecl; 5266} 5267 5268/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5269/// handler. 5270Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5271 TypeSourceInfo *TInfo = 0; 5272 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5273 5274 bool Invalid = D.isInvalidType(); 5275 IdentifierInfo *II = D.getIdentifier(); 5276 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 5277 // The scope should be freshly made just for us. There is just no way 5278 // it contains any previous declaration. 5279 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5280 if (PrevDecl->isTemplateParameter()) { 5281 // Maybe we will complain about the shadowed template parameter. 5282 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5283 } 5284 } 5285 5286 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5287 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5288 << D.getCXXScopeSpec().getRange(); 5289 Invalid = true; 5290 } 5291 5292 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5293 D.getIdentifier(), 5294 D.getIdentifierLoc(), 5295 D.getDeclSpec().getSourceRange()); 5296 5297 if (Invalid) 5298 ExDecl->setInvalidDecl(); 5299 5300 // Add the exception declaration into this scope. 5301 if (II) 5302 PushOnScopeChains(ExDecl, S); 5303 else 5304 CurContext->addDecl(ExDecl); 5305 5306 ProcessDeclAttributes(S, ExDecl, D); 5307 return DeclPtrTy::make(ExDecl); 5308} 5309 5310Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5311 ExprArg assertexpr, 5312 ExprArg assertmessageexpr) { 5313 Expr *AssertExpr = (Expr *)assertexpr.get(); 5314 StringLiteral *AssertMessage = 5315 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5316 5317 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5318 llvm::APSInt Value(32); 5319 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5320 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5321 AssertExpr->getSourceRange(); 5322 return DeclPtrTy(); 5323 } 5324 5325 if (Value == 0) { 5326 Diag(AssertLoc, diag::err_static_assert_failed) 5327 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5328 } 5329 } 5330 5331 assertexpr.release(); 5332 assertmessageexpr.release(); 5333 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5334 AssertExpr, AssertMessage); 5335 5336 CurContext->addDecl(Decl); 5337 return DeclPtrTy::make(Decl); 5338} 5339 5340/// Handle a friend type declaration. This works in tandem with 5341/// ActOnTag. 5342/// 5343/// Notes on friend class templates: 5344/// 5345/// We generally treat friend class declarations as if they were 5346/// declaring a class. So, for example, the elaborated type specifier 5347/// in a friend declaration is required to obey the restrictions of a 5348/// class-head (i.e. no typedefs in the scope chain), template 5349/// parameters are required to match up with simple template-ids, &c. 5350/// However, unlike when declaring a template specialization, it's 5351/// okay to refer to a template specialization without an empty 5352/// template parameter declaration, e.g. 5353/// friend class A<T>::B<unsigned>; 5354/// We permit this as a special case; if there are any template 5355/// parameters present at all, require proper matching, i.e. 5356/// template <> template <class T> friend class A<int>::B; 5357Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5358 MultiTemplateParamsArg TempParams) { 5359 SourceLocation Loc = DS.getSourceRange().getBegin(); 5360 5361 assert(DS.isFriendSpecified()); 5362 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5363 5364 // Try to convert the decl specifier to a type. This works for 5365 // friend templates because ActOnTag never produces a ClassTemplateDecl 5366 // for a TUK_Friend. 5367 Declarator TheDeclarator(DS, Declarator::MemberContext); 5368 QualType T = GetTypeForDeclarator(TheDeclarator, S); 5369 if (TheDeclarator.isInvalidType()) 5370 return DeclPtrTy(); 5371 5372 // This is definitely an error in C++98. It's probably meant to 5373 // be forbidden in C++0x, too, but the specification is just 5374 // poorly written. 5375 // 5376 // The problem is with declarations like the following: 5377 // template <T> friend A<T>::foo; 5378 // where deciding whether a class C is a friend or not now hinges 5379 // on whether there exists an instantiation of A that causes 5380 // 'foo' to equal C. There are restrictions on class-heads 5381 // (which we declare (by fiat) elaborated friend declarations to 5382 // be) that makes this tractable. 5383 // 5384 // FIXME: handle "template <> friend class A<T>;", which 5385 // is possibly well-formed? Who even knows? 5386 if (TempParams.size() && !isa<ElaboratedType>(T)) { 5387 Diag(Loc, diag::err_tagless_friend_type_template) 5388 << DS.getSourceRange(); 5389 return DeclPtrTy(); 5390 } 5391 5392 // C++ [class.friend]p2: 5393 // An elaborated-type-specifier shall be used in a friend declaration 5394 // for a class.* 5395 // * The class-key of the elaborated-type-specifier is required. 5396 // This is one of the rare places in Clang where it's legitimate to 5397 // ask about the "spelling" of the type. 5398 if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) { 5399 // If we evaluated the type to a record type, suggest putting 5400 // a tag in front. 5401 if (const RecordType *RT = T->getAs<RecordType>()) { 5402 RecordDecl *RD = RT->getDecl(); 5403 5404 std::string InsertionText = std::string(" ") + RD->getKindName(); 5405 5406 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 5407 << (unsigned) RD->getTagKind() 5408 << T 5409 << SourceRange(DS.getFriendSpecLoc()) 5410 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 5411 InsertionText); 5412 return DeclPtrTy(); 5413 }else { 5414 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 5415 << DS.getSourceRange(); 5416 return DeclPtrTy(); 5417 } 5418 } 5419 5420 // Enum types cannot be friends. 5421 if (T->getAs<EnumType>()) { 5422 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 5423 << SourceRange(DS.getFriendSpecLoc()); 5424 return DeclPtrTy(); 5425 } 5426 5427 // C++98 [class.friend]p1: A friend of a class is a function 5428 // or class that is not a member of the class . . . 5429 // This is fixed in DR77, which just barely didn't make the C++03 5430 // deadline. It's also a very silly restriction that seriously 5431 // affects inner classes and which nobody else seems to implement; 5432 // thus we never diagnose it, not even in -pedantic. 5433 5434 Decl *D; 5435 if (TempParams.size()) 5436 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5437 TempParams.size(), 5438 (TemplateParameterList**) TempParams.release(), 5439 T.getTypePtr(), 5440 DS.getFriendSpecLoc()); 5441 else 5442 D = FriendDecl::Create(Context, CurContext, Loc, T.getTypePtr(), 5443 DS.getFriendSpecLoc()); 5444 D->setAccess(AS_public); 5445 CurContext->addDecl(D); 5446 5447 return DeclPtrTy::make(D); 5448} 5449 5450Sema::DeclPtrTy 5451Sema::ActOnFriendFunctionDecl(Scope *S, 5452 Declarator &D, 5453 bool IsDefinition, 5454 MultiTemplateParamsArg TemplateParams) { 5455 const DeclSpec &DS = D.getDeclSpec(); 5456 5457 assert(DS.isFriendSpecified()); 5458 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5459 5460 SourceLocation Loc = D.getIdentifierLoc(); 5461 TypeSourceInfo *TInfo = 0; 5462 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5463 5464 // C++ [class.friend]p1 5465 // A friend of a class is a function or class.... 5466 // Note that this sees through typedefs, which is intended. 5467 // It *doesn't* see through dependent types, which is correct 5468 // according to [temp.arg.type]p3: 5469 // If a declaration acquires a function type through a 5470 // type dependent on a template-parameter and this causes 5471 // a declaration that does not use the syntactic form of a 5472 // function declarator to have a function type, the program 5473 // is ill-formed. 5474 if (!T->isFunctionType()) { 5475 Diag(Loc, diag::err_unexpected_friend); 5476 5477 // It might be worthwhile to try to recover by creating an 5478 // appropriate declaration. 5479 return DeclPtrTy(); 5480 } 5481 5482 // C++ [namespace.memdef]p3 5483 // - If a friend declaration in a non-local class first declares a 5484 // class or function, the friend class or function is a member 5485 // of the innermost enclosing namespace. 5486 // - The name of the friend is not found by simple name lookup 5487 // until a matching declaration is provided in that namespace 5488 // scope (either before or after the class declaration granting 5489 // friendship). 5490 // - If a friend function is called, its name may be found by the 5491 // name lookup that considers functions from namespaces and 5492 // classes associated with the types of the function arguments. 5493 // - When looking for a prior declaration of a class or a function 5494 // declared as a friend, scopes outside the innermost enclosing 5495 // namespace scope are not considered. 5496 5497 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5498 DeclarationName Name = GetNameForDeclarator(D); 5499 assert(Name); 5500 5501 // The context we found the declaration in, or in which we should 5502 // create the declaration. 5503 DeclContext *DC; 5504 5505 // FIXME: handle local classes 5506 5507 // Recover from invalid scope qualifiers as if they just weren't there. 5508 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5509 ForRedeclaration); 5510 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5511 // FIXME: RequireCompleteDeclContext 5512 DC = computeDeclContext(ScopeQual); 5513 5514 // FIXME: handle dependent contexts 5515 if (!DC) return DeclPtrTy(); 5516 5517 LookupQualifiedName(Previous, DC); 5518 5519 // If searching in that context implicitly found a declaration in 5520 // a different context, treat it like it wasn't found at all. 5521 // TODO: better diagnostics for this case. Suggesting the right 5522 // qualified scope would be nice... 5523 // FIXME: getRepresentativeDecl() is not right here at all 5524 if (Previous.empty() || 5525 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5526 D.setInvalidType(); 5527 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5528 return DeclPtrTy(); 5529 } 5530 5531 // C++ [class.friend]p1: A friend of a class is a function or 5532 // class that is not a member of the class . . . 5533 if (DC->Equals(CurContext)) 5534 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5535 5536 // Otherwise walk out to the nearest namespace scope looking for matches. 5537 } else { 5538 // TODO: handle local class contexts. 5539 5540 DC = CurContext; 5541 while (true) { 5542 // Skip class contexts. If someone can cite chapter and verse 5543 // for this behavior, that would be nice --- it's what GCC and 5544 // EDG do, and it seems like a reasonable intent, but the spec 5545 // really only says that checks for unqualified existing 5546 // declarations should stop at the nearest enclosing namespace, 5547 // not that they should only consider the nearest enclosing 5548 // namespace. 5549 while (DC->isRecord()) 5550 DC = DC->getParent(); 5551 5552 LookupQualifiedName(Previous, DC); 5553 5554 // TODO: decide what we think about using declarations. 5555 if (!Previous.empty()) 5556 break; 5557 5558 if (DC->isFileContext()) break; 5559 DC = DC->getParent(); 5560 } 5561 5562 // C++ [class.friend]p1: A friend of a class is a function or 5563 // class that is not a member of the class . . . 5564 // C++0x changes this for both friend types and functions. 5565 // Most C++ 98 compilers do seem to give an error here, so 5566 // we do, too. 5567 if (!Previous.empty() && DC->Equals(CurContext) 5568 && !getLangOptions().CPlusPlus0x) 5569 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5570 } 5571 5572 if (DC->isFileContext()) { 5573 // This implies that it has to be an operator or function. 5574 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5575 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5576 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5577 Diag(Loc, diag::err_introducing_special_friend) << 5578 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5579 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5580 return DeclPtrTy(); 5581 } 5582 } 5583 5584 bool Redeclaration = false; 5585 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5586 move(TemplateParams), 5587 IsDefinition, 5588 Redeclaration); 5589 if (!ND) return DeclPtrTy(); 5590 5591 assert(ND->getDeclContext() == DC); 5592 assert(ND->getLexicalDeclContext() == CurContext); 5593 5594 // Add the function declaration to the appropriate lookup tables, 5595 // adjusting the redeclarations list as necessary. We don't 5596 // want to do this yet if the friending class is dependent. 5597 // 5598 // Also update the scope-based lookup if the target context's 5599 // lookup context is in lexical scope. 5600 if (!CurContext->isDependentContext()) { 5601 DC = DC->getLookupContext(); 5602 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5603 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5604 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5605 } 5606 5607 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5608 D.getIdentifierLoc(), ND, 5609 DS.getFriendSpecLoc()); 5610 FrD->setAccess(AS_public); 5611 CurContext->addDecl(FrD); 5612 5613 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) 5614 FrD->setSpecialization(true); 5615 5616 return DeclPtrTy::make(ND); 5617} 5618 5619void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5620 AdjustDeclIfTemplate(dcl); 5621 5622 Decl *Dcl = dcl.getAs<Decl>(); 5623 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5624 if (!Fn) { 5625 Diag(DelLoc, diag::err_deleted_non_function); 5626 return; 5627 } 5628 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5629 Diag(DelLoc, diag::err_deleted_decl_not_first); 5630 Diag(Prev->getLocation(), diag::note_previous_declaration); 5631 // If the declaration wasn't the first, we delete the function anyway for 5632 // recovery. 5633 } 5634 Fn->setDeleted(); 5635} 5636 5637static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5638 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5639 ++CI) { 5640 Stmt *SubStmt = *CI; 5641 if (!SubStmt) 5642 continue; 5643 if (isa<ReturnStmt>(SubStmt)) 5644 Self.Diag(SubStmt->getSourceRange().getBegin(), 5645 diag::err_return_in_constructor_handler); 5646 if (!isa<Expr>(SubStmt)) 5647 SearchForReturnInStmt(Self, SubStmt); 5648 } 5649} 5650 5651void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5652 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5653 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5654 SearchForReturnInStmt(*this, Handler); 5655 } 5656} 5657 5658bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5659 const CXXMethodDecl *Old) { 5660 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5661 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5662 5663 if (Context.hasSameType(NewTy, OldTy) || 5664 NewTy->isDependentType() || OldTy->isDependentType()) 5665 return false; 5666 5667 // Check if the return types are covariant 5668 QualType NewClassTy, OldClassTy; 5669 5670 /// Both types must be pointers or references to classes. 5671 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5672 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5673 NewClassTy = NewPT->getPointeeType(); 5674 OldClassTy = OldPT->getPointeeType(); 5675 } 5676 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5677 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5678 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5679 NewClassTy = NewRT->getPointeeType(); 5680 OldClassTy = OldRT->getPointeeType(); 5681 } 5682 } 5683 } 5684 5685 // The return types aren't either both pointers or references to a class type. 5686 if (NewClassTy.isNull()) { 5687 Diag(New->getLocation(), 5688 diag::err_different_return_type_for_overriding_virtual_function) 5689 << New->getDeclName() << NewTy << OldTy; 5690 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5691 5692 return true; 5693 } 5694 5695 // C++ [class.virtual]p6: 5696 // If the return type of D::f differs from the return type of B::f, the 5697 // class type in the return type of D::f shall be complete at the point of 5698 // declaration of D::f or shall be the class type D. 5699 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5700 if (!RT->isBeingDefined() && 5701 RequireCompleteType(New->getLocation(), NewClassTy, 5702 PDiag(diag::err_covariant_return_incomplete) 5703 << New->getDeclName())) 5704 return true; 5705 } 5706 5707 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5708 // Check if the new class derives from the old class. 5709 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5710 Diag(New->getLocation(), 5711 diag::err_covariant_return_not_derived) 5712 << New->getDeclName() << NewTy << OldTy; 5713 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5714 return true; 5715 } 5716 5717 // Check if we the conversion from derived to base is valid. 5718 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, ADK_covariance, 5719 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5720 // FIXME: Should this point to the return type? 5721 New->getLocation(), SourceRange(), New->getDeclName())) { 5722 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5723 return true; 5724 } 5725 } 5726 5727 // The qualifiers of the return types must be the same. 5728 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5729 Diag(New->getLocation(), 5730 diag::err_covariant_return_type_different_qualifications) 5731 << New->getDeclName() << NewTy << OldTy; 5732 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5733 return true; 5734 }; 5735 5736 5737 // The new class type must have the same or less qualifiers as the old type. 5738 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5739 Diag(New->getLocation(), 5740 diag::err_covariant_return_type_class_type_more_qualified) 5741 << New->getDeclName() << NewTy << OldTy; 5742 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5743 return true; 5744 }; 5745 5746 return false; 5747} 5748 5749bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5750 const CXXMethodDecl *Old) 5751{ 5752 if (Old->hasAttr<FinalAttr>()) { 5753 Diag(New->getLocation(), diag::err_final_function_overridden) 5754 << New->getDeclName(); 5755 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5756 return true; 5757 } 5758 5759 return false; 5760} 5761 5762/// \brief Mark the given method pure. 5763/// 5764/// \param Method the method to be marked pure. 5765/// 5766/// \param InitRange the source range that covers the "0" initializer. 5767bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5768 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5769 Method->setPure(); 5770 5771 // A class is abstract if at least one function is pure virtual. 5772 Method->getParent()->setAbstract(true); 5773 return false; 5774 } 5775 5776 if (!Method->isInvalidDecl()) 5777 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5778 << Method->getDeclName() << InitRange; 5779 return true; 5780} 5781 5782/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5783/// an initializer for the out-of-line declaration 'Dcl'. The scope 5784/// is a fresh scope pushed for just this purpose. 5785/// 5786/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5787/// static data member of class X, names should be looked up in the scope of 5788/// class X. 5789void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5790 // If there is no declaration, there was an error parsing it. 5791 Decl *D = Dcl.getAs<Decl>(); 5792 if (D == 0) return; 5793 5794 // We should only get called for declarations with scope specifiers, like: 5795 // int foo::bar; 5796 assert(D->isOutOfLine()); 5797 EnterDeclaratorContext(S, D->getDeclContext()); 5798} 5799 5800/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5801/// initializer for the out-of-line declaration 'Dcl'. 5802void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5803 // If there is no declaration, there was an error parsing it. 5804 Decl *D = Dcl.getAs<Decl>(); 5805 if (D == 0) return; 5806 5807 assert(D->isOutOfLine()); 5808 ExitDeclaratorContext(S); 5809} 5810 5811/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5812/// C++ if/switch/while/for statement. 5813/// e.g: "if (int x = f()) {...}" 5814Action::DeclResult 5815Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5816 // C++ 6.4p2: 5817 // The declarator shall not specify a function or an array. 5818 // The type-specifier-seq shall not contain typedef and shall not declare a 5819 // new class or enumeration. 5820 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5821 "Parser allowed 'typedef' as storage class of condition decl."); 5822 5823 TypeSourceInfo *TInfo = 0; 5824 TagDecl *OwnedTag = 0; 5825 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5826 5827 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5828 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5829 // would be created and CXXConditionDeclExpr wants a VarDecl. 5830 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5831 << D.getSourceRange(); 5832 return DeclResult(); 5833 } else if (OwnedTag && OwnedTag->isDefinition()) { 5834 // The type-specifier-seq shall not declare a new class or enumeration. 5835 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5836 } 5837 5838 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5839 if (!Dcl) 5840 return DeclResult(); 5841 5842 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5843 VD->setDeclaredInCondition(true); 5844 return Dcl; 5845} 5846 5847static bool needsVtable(CXXMethodDecl *MD, ASTContext &Context) { 5848 // Ignore dependent types. 5849 if (MD->isDependentContext()) 5850 return false; 5851 5852 // Ignore declarations that are not definitions. 5853 if (!MD->isThisDeclarationADefinition()) 5854 return false; 5855 5856 CXXRecordDecl *RD = MD->getParent(); 5857 5858 // Ignore classes without a vtable. 5859 if (!RD->isDynamicClass()) 5860 return false; 5861 5862 switch (MD->getParent()->getTemplateSpecializationKind()) { 5863 case TSK_Undeclared: 5864 case TSK_ExplicitSpecialization: 5865 // Classes that aren't instantiations of templates don't need their 5866 // virtual methods marked until we see the definition of the key 5867 // function. 5868 break; 5869 5870 case TSK_ImplicitInstantiation: 5871 // This is a constructor of a class template; mark all of the virtual 5872 // members as referenced to ensure that they get instantiatied. 5873 if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) 5874 return true; 5875 break; 5876 5877 case TSK_ExplicitInstantiationDeclaration: 5878 return true; //FIXME: This looks wrong. 5879 5880 case TSK_ExplicitInstantiationDefinition: 5881 // This is method of a explicit instantiation; mark all of the virtual 5882 // members as referenced to ensure that they get instantiatied. 5883 return true; 5884 } 5885 5886 // Consider only out-of-line definitions of member functions. When we see 5887 // an inline definition, it's too early to compute the key function. 5888 if (!MD->isOutOfLine()) 5889 return false; 5890 5891 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5892 5893 // If there is no key function, we will need a copy of the vtable. 5894 if (!KeyFunction) 5895 return true; 5896 5897 // If this is the key function, we need to mark virtual members. 5898 if (KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 5899 return true; 5900 5901 return false; 5902} 5903 5904void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5905 CXXMethodDecl *MD) { 5906 CXXRecordDecl *RD = MD->getParent(); 5907 5908 // We will need to mark all of the virtual members as referenced to build the 5909 // vtable. 5910 if (!needsVtable(MD, Context)) 5911 return; 5912 5913 TemplateSpecializationKind kind = RD->getTemplateSpecializationKind(); 5914 if (kind == TSK_ImplicitInstantiation) 5915 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 5916 else 5917 MarkVirtualMembersReferenced(Loc, RD); 5918} 5919 5920bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5921 if (ClassesWithUnmarkedVirtualMembers.empty()) 5922 return false; 5923 5924 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 5925 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 5926 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 5927 ClassesWithUnmarkedVirtualMembers.pop_back(); 5928 MarkVirtualMembersReferenced(Loc, RD); 5929 } 5930 5931 return true; 5932} 5933 5934void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, CXXRecordDecl *RD) { 5935 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5936 e = RD->method_end(); i != e; ++i) { 5937 CXXMethodDecl *MD = *i; 5938 5939 // C++ [basic.def.odr]p2: 5940 // [...] A virtual member function is used if it is not pure. [...] 5941 if (MD->isVirtual() && !MD->isPure()) 5942 MarkDeclarationReferenced(Loc, MD); 5943 } 5944} 5945