SemaDeclCXX.cpp revision 6d1828949df82e2f2bb2606ea7a3b40029a7f9e2
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} 667 668/// \brief Determine whether the type \p Derived is a C++ class that is 669/// derived from the type \p Base. 670bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 671 if (!getLangOptions().CPlusPlus) 672 return false; 673 674 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 675 if (!DerivedRT) 676 return false; 677 678 const RecordType *BaseRT = Base->getAs<RecordType>(); 679 if (!BaseRT) 680 return false; 681 682 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 683 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 684 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 685 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 686} 687 688/// \brief Determine whether the type \p Derived is a C++ class that is 689/// derived from the type \p Base. 690bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 691 if (!getLangOptions().CPlusPlus) 692 return false; 693 694 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 695 if (!DerivedRT) 696 return false; 697 698 const RecordType *BaseRT = Base->getAs<RecordType>(); 699 if (!BaseRT) 700 return false; 701 702 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 703 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 704 return DerivedRD->isDerivedFrom(BaseRD, Paths); 705} 706 707/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 708/// conversion (where Derived and Base are class types) is 709/// well-formed, meaning that the conversion is unambiguous (and 710/// that all of the base classes are accessible). Returns true 711/// and emits a diagnostic if the code is ill-formed, returns false 712/// otherwise. Loc is the location where this routine should point to 713/// if there is an error, and Range is the source range to highlight 714/// if there is an error. 715bool 716Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 717 AccessDiagnosticsKind ADK, 718 unsigned AmbigiousBaseConvID, 719 SourceLocation Loc, SourceRange Range, 720 DeclarationName Name) { 721 // First, determine whether the path from Derived to Base is 722 // ambiguous. This is slightly more expensive than checking whether 723 // the Derived to Base conversion exists, because here we need to 724 // explore multiple paths to determine if there is an ambiguity. 725 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 726 /*DetectVirtual=*/false); 727 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 728 assert(DerivationOkay && 729 "Can only be used with a derived-to-base conversion"); 730 (void)DerivationOkay; 731 732 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 733 if (ADK == ADK_quiet) 734 return false; 735 736 // Check that the base class can be accessed. 737 switch (CheckBaseClassAccess(Loc, /*IsBaseToDerived*/ false, 738 Base, Derived, Paths.front(), 739 /*force*/ false, 740 /*unprivileged*/ false, 741 ADK)) { 742 case AR_accessible: return false; 743 case AR_inaccessible: return true; 744 case AR_dependent: return false; 745 case AR_delayed: return false; 746 } 747 } 748 749 // We know that the derived-to-base conversion is ambiguous, and 750 // we're going to produce a diagnostic. Perform the derived-to-base 751 // search just one more time to compute all of the possible paths so 752 // that we can print them out. This is more expensive than any of 753 // the previous derived-to-base checks we've done, but at this point 754 // performance isn't as much of an issue. 755 Paths.clear(); 756 Paths.setRecordingPaths(true); 757 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 758 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 759 (void)StillOkay; 760 761 // Build up a textual representation of the ambiguous paths, e.g., 762 // D -> B -> A, that will be used to illustrate the ambiguous 763 // conversions in the diagnostic. We only print one of the paths 764 // to each base class subobject. 765 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 766 767 Diag(Loc, AmbigiousBaseConvID) 768 << Derived << Base << PathDisplayStr << Range << Name; 769 return true; 770} 771 772bool 773Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 774 SourceLocation Loc, SourceRange Range, 775 bool IgnoreAccess) { 776 return CheckDerivedToBaseConversion(Derived, Base, 777 IgnoreAccess ? ADK_quiet : ADK_normal, 778 diag::err_ambiguous_derived_to_base_conv, 779 Loc, Range, DeclarationName()); 780} 781 782 783/// @brief Builds a string representing ambiguous paths from a 784/// specific derived class to different subobjects of the same base 785/// class. 786/// 787/// This function builds a string that can be used in error messages 788/// to show the different paths that one can take through the 789/// inheritance hierarchy to go from the derived class to different 790/// subobjects of a base class. The result looks something like this: 791/// @code 792/// struct D -> struct B -> struct A 793/// struct D -> struct C -> struct A 794/// @endcode 795std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 796 std::string PathDisplayStr; 797 std::set<unsigned> DisplayedPaths; 798 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 799 Path != Paths.end(); ++Path) { 800 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 801 // We haven't displayed a path to this particular base 802 // class subobject yet. 803 PathDisplayStr += "\n "; 804 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 805 for (CXXBasePath::const_iterator Element = Path->begin(); 806 Element != Path->end(); ++Element) 807 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 808 } 809 } 810 811 return PathDisplayStr; 812} 813 814//===----------------------------------------------------------------------===// 815// C++ class member Handling 816//===----------------------------------------------------------------------===// 817 818/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 819/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 820/// bitfield width if there is one and 'InitExpr' specifies the initializer if 821/// any. 822Sema::DeclPtrTy 823Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 824 MultiTemplateParamsArg TemplateParameterLists, 825 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 826 bool Deleted) { 827 const DeclSpec &DS = D.getDeclSpec(); 828 DeclarationName Name = GetNameForDeclarator(D); 829 Expr *BitWidth = static_cast<Expr*>(BW); 830 Expr *Init = static_cast<Expr*>(InitExpr); 831 SourceLocation Loc = D.getIdentifierLoc(); 832 833 bool isFunc = D.isFunctionDeclarator(); 834 835 assert(!DS.isFriendSpecified()); 836 837 // C++ 9.2p6: A member shall not be declared to have automatic storage 838 // duration (auto, register) or with the extern storage-class-specifier. 839 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 840 // data members and cannot be applied to names declared const or static, 841 // and cannot be applied to reference members. 842 switch (DS.getStorageClassSpec()) { 843 case DeclSpec::SCS_unspecified: 844 case DeclSpec::SCS_typedef: 845 case DeclSpec::SCS_static: 846 // FALL THROUGH. 847 break; 848 case DeclSpec::SCS_mutable: 849 if (isFunc) { 850 if (DS.getStorageClassSpecLoc().isValid()) 851 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 852 else 853 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 854 855 // FIXME: It would be nicer if the keyword was ignored only for this 856 // declarator. Otherwise we could get follow-up errors. 857 D.getMutableDeclSpec().ClearStorageClassSpecs(); 858 } else { 859 QualType T = GetTypeForDeclarator(D, S); 860 diag::kind err = static_cast<diag::kind>(0); 861 if (T->isReferenceType()) 862 err = diag::err_mutable_reference; 863 else if (T.isConstQualified()) 864 err = diag::err_mutable_const; 865 if (err != 0) { 866 if (DS.getStorageClassSpecLoc().isValid()) 867 Diag(DS.getStorageClassSpecLoc(), err); 868 else 869 Diag(DS.getThreadSpecLoc(), err); 870 // FIXME: It would be nicer if the keyword was ignored only for this 871 // declarator. Otherwise we could get follow-up errors. 872 D.getMutableDeclSpec().ClearStorageClassSpecs(); 873 } 874 } 875 break; 876 default: 877 if (DS.getStorageClassSpecLoc().isValid()) 878 Diag(DS.getStorageClassSpecLoc(), 879 diag::err_storageclass_invalid_for_member); 880 else 881 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 882 D.getMutableDeclSpec().ClearStorageClassSpecs(); 883 } 884 885 if (!isFunc && 886 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 887 D.getNumTypeObjects() == 0) { 888 // Check also for this case: 889 // 890 // typedef int f(); 891 // f a; 892 // 893 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 894 isFunc = TDType->isFunctionType(); 895 } 896 897 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 898 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 899 !isFunc); 900 901 Decl *Member; 902 if (isInstField) { 903 // FIXME: Check for template parameters! 904 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 905 AS); 906 assert(Member && "HandleField never returns null"); 907 } else { 908 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 909 .getAs<Decl>(); 910 if (!Member) { 911 if (BitWidth) DeleteExpr(BitWidth); 912 return DeclPtrTy(); 913 } 914 915 // Non-instance-fields can't have a bitfield. 916 if (BitWidth) { 917 if (Member->isInvalidDecl()) { 918 // don't emit another diagnostic. 919 } else if (isa<VarDecl>(Member)) { 920 // C++ 9.6p3: A bit-field shall not be a static member. 921 // "static member 'A' cannot be a bit-field" 922 Diag(Loc, diag::err_static_not_bitfield) 923 << Name << BitWidth->getSourceRange(); 924 } else if (isa<TypedefDecl>(Member)) { 925 // "typedef member 'x' cannot be a bit-field" 926 Diag(Loc, diag::err_typedef_not_bitfield) 927 << Name << BitWidth->getSourceRange(); 928 } else { 929 // A function typedef ("typedef int f(); f a;"). 930 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 931 Diag(Loc, diag::err_not_integral_type_bitfield) 932 << Name << cast<ValueDecl>(Member)->getType() 933 << BitWidth->getSourceRange(); 934 } 935 936 DeleteExpr(BitWidth); 937 BitWidth = 0; 938 Member->setInvalidDecl(); 939 } 940 941 Member->setAccess(AS); 942 943 // If we have declared a member function template, set the access of the 944 // templated declaration as well. 945 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 946 FunTmpl->getTemplatedDecl()->setAccess(AS); 947 } 948 949 assert((Name || isInstField) && "No identifier for non-field ?"); 950 951 if (Init) 952 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 953 if (Deleted) // FIXME: Source location is not very good. 954 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 955 956 if (isInstField) { 957 FieldCollector->Add(cast<FieldDecl>(Member)); 958 return DeclPtrTy(); 959 } 960 return DeclPtrTy::make(Member); 961} 962 963/// \brief Find the direct and/or virtual base specifiers that 964/// correspond to the given base type, for use in base initialization 965/// within a constructor. 966static bool FindBaseInitializer(Sema &SemaRef, 967 CXXRecordDecl *ClassDecl, 968 QualType BaseType, 969 const CXXBaseSpecifier *&DirectBaseSpec, 970 const CXXBaseSpecifier *&VirtualBaseSpec) { 971 // First, check for a direct base class. 972 DirectBaseSpec = 0; 973 for (CXXRecordDecl::base_class_const_iterator Base 974 = ClassDecl->bases_begin(); 975 Base != ClassDecl->bases_end(); ++Base) { 976 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 977 // We found a direct base of this type. That's what we're 978 // initializing. 979 DirectBaseSpec = &*Base; 980 break; 981 } 982 } 983 984 // Check for a virtual base class. 985 // FIXME: We might be able to short-circuit this if we know in advance that 986 // there are no virtual bases. 987 VirtualBaseSpec = 0; 988 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 989 // We haven't found a base yet; search the class hierarchy for a 990 // virtual base class. 991 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 992 /*DetectVirtual=*/false); 993 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 994 BaseType, Paths)) { 995 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 996 Path != Paths.end(); ++Path) { 997 if (Path->back().Base->isVirtual()) { 998 VirtualBaseSpec = Path->back().Base; 999 break; 1000 } 1001 } 1002 } 1003 } 1004 1005 return DirectBaseSpec || VirtualBaseSpec; 1006} 1007 1008/// ActOnMemInitializer - Handle a C++ member initializer. 1009Sema::MemInitResult 1010Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1011 Scope *S, 1012 const CXXScopeSpec &SS, 1013 IdentifierInfo *MemberOrBase, 1014 TypeTy *TemplateTypeTy, 1015 SourceLocation IdLoc, 1016 SourceLocation LParenLoc, 1017 ExprTy **Args, unsigned NumArgs, 1018 SourceLocation *CommaLocs, 1019 SourceLocation RParenLoc) { 1020 if (!ConstructorD) 1021 return true; 1022 1023 AdjustDeclIfTemplate(ConstructorD); 1024 1025 CXXConstructorDecl *Constructor 1026 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1027 if (!Constructor) { 1028 // The user wrote a constructor initializer on a function that is 1029 // not a C++ constructor. Ignore the error for now, because we may 1030 // have more member initializers coming; we'll diagnose it just 1031 // once in ActOnMemInitializers. 1032 return true; 1033 } 1034 1035 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1036 1037 // C++ [class.base.init]p2: 1038 // Names in a mem-initializer-id are looked up in the scope of the 1039 // constructor’s class and, if not found in that scope, are looked 1040 // up in the scope containing the constructor’s 1041 // definition. [Note: if the constructor’s class contains a member 1042 // with the same name as a direct or virtual base class of the 1043 // class, a mem-initializer-id naming the member or base class and 1044 // composed of a single identifier refers to the class member. A 1045 // mem-initializer-id for the hidden base class may be specified 1046 // using a qualified name. ] 1047 if (!SS.getScopeRep() && !TemplateTypeTy) { 1048 // Look for a member, first. 1049 FieldDecl *Member = 0; 1050 DeclContext::lookup_result Result 1051 = ClassDecl->lookup(MemberOrBase); 1052 if (Result.first != Result.second) 1053 Member = dyn_cast<FieldDecl>(*Result.first); 1054 1055 // FIXME: Handle members of an anonymous union. 1056 1057 if (Member) 1058 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1059 LParenLoc, RParenLoc); 1060 } 1061 // It didn't name a member, so see if it names a class. 1062 QualType BaseType; 1063 TypeSourceInfo *TInfo = 0; 1064 1065 if (TemplateTypeTy) { 1066 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1067 } else { 1068 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1069 LookupParsedName(R, S, &SS); 1070 1071 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1072 if (!TyD) { 1073 if (R.isAmbiguous()) return true; 1074 1075 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1076 bool NotUnknownSpecialization = false; 1077 DeclContext *DC = computeDeclContext(SS, false); 1078 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1079 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1080 1081 if (!NotUnknownSpecialization) { 1082 // When the scope specifier can refer to a member of an unknown 1083 // specialization, we take it as a type name. 1084 BaseType = CheckTypenameType((NestedNameSpecifier *)SS.getScopeRep(), 1085 *MemberOrBase, SS.getRange()); 1086 R.clear(); 1087 } 1088 } 1089 1090 // If no results were found, try to correct typos. 1091 if (R.empty() && BaseType.isNull() && 1092 CorrectTypo(R, S, &SS, ClassDecl) && R.isSingleResult()) { 1093 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1094 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1095 // We have found a non-static data member with a similar 1096 // name to what was typed; complain and initialize that 1097 // member. 1098 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1099 << MemberOrBase << true << R.getLookupName() 1100 << CodeModificationHint::CreateReplacement(R.getNameLoc(), 1101 R.getLookupName().getAsString()); 1102 Diag(Member->getLocation(), diag::note_previous_decl) 1103 << Member->getDeclName(); 1104 1105 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1106 LParenLoc, RParenLoc); 1107 } 1108 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1109 const CXXBaseSpecifier *DirectBaseSpec; 1110 const CXXBaseSpecifier *VirtualBaseSpec; 1111 if (FindBaseInitializer(*this, ClassDecl, 1112 Context.getTypeDeclType(Type), 1113 DirectBaseSpec, VirtualBaseSpec)) { 1114 // We have found a direct or virtual base class with a 1115 // similar name to what was typed; complain and initialize 1116 // that base class. 1117 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1118 << MemberOrBase << false << R.getLookupName() 1119 << CodeModificationHint::CreateReplacement(R.getNameLoc(), 1120 R.getLookupName().getAsString()); 1121 1122 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1123 : VirtualBaseSpec; 1124 Diag(BaseSpec->getSourceRange().getBegin(), 1125 diag::note_base_class_specified_here) 1126 << BaseSpec->getType() 1127 << BaseSpec->getSourceRange(); 1128 1129 TyD = Type; 1130 } 1131 } 1132 } 1133 1134 if (!TyD && BaseType.isNull()) { 1135 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1136 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1137 return true; 1138 } 1139 } 1140 1141 if (BaseType.isNull()) { 1142 BaseType = Context.getTypeDeclType(TyD); 1143 if (SS.isSet()) { 1144 NestedNameSpecifier *Qualifier = 1145 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1146 1147 // FIXME: preserve source range information 1148 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1149 } 1150 } 1151 } 1152 1153 if (!TInfo) 1154 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1155 1156 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1157 LParenLoc, RParenLoc, ClassDecl); 1158} 1159 1160/// Checks an initializer expression for use of uninitialized fields, such as 1161/// containing the field that is being initialized. Returns true if there is an 1162/// uninitialized field was used an updates the SourceLocation parameter; false 1163/// otherwise. 1164static bool InitExprContainsUninitializedFields(const Stmt* S, 1165 const FieldDecl* LhsField, 1166 SourceLocation* L) { 1167 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1168 if (ME) { 1169 const NamedDecl* RhsField = ME->getMemberDecl(); 1170 if (RhsField == LhsField) { 1171 // Initializing a field with itself. Throw a warning. 1172 // But wait; there are exceptions! 1173 // Exception #1: The field may not belong to this record. 1174 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1175 const Expr* base = ME->getBase(); 1176 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1177 // Even though the field matches, it does not belong to this record. 1178 return false; 1179 } 1180 // None of the exceptions triggered; return true to indicate an 1181 // uninitialized field was used. 1182 *L = ME->getMemberLoc(); 1183 return true; 1184 } 1185 } 1186 bool found = false; 1187 for (Stmt::const_child_iterator it = S->child_begin(); 1188 it != S->child_end() && found == false; 1189 ++it) { 1190 if (isa<CallExpr>(S)) { 1191 // Do not descend into function calls or constructors, as the use 1192 // of an uninitialized field may be valid. One would have to inspect 1193 // the contents of the function/ctor to determine if it is safe or not. 1194 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1195 // may be safe, depending on what the function/ctor does. 1196 continue; 1197 } 1198 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1199 } 1200 return found; 1201} 1202 1203Sema::MemInitResult 1204Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1205 unsigned NumArgs, SourceLocation IdLoc, 1206 SourceLocation LParenLoc, 1207 SourceLocation RParenLoc) { 1208 // Diagnose value-uses of fields to initialize themselves, e.g. 1209 // foo(foo) 1210 // where foo is not also a parameter to the constructor. 1211 // TODO: implement -Wuninitialized and fold this into that framework. 1212 for (unsigned i = 0; i < NumArgs; ++i) { 1213 SourceLocation L; 1214 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1215 // FIXME: Return true in the case when other fields are used before being 1216 // uninitialized. For example, let this field be the i'th field. When 1217 // initializing the i'th field, throw a warning if any of the >= i'th 1218 // fields are used, as they are not yet initialized. 1219 // Right now we are only handling the case where the i'th field uses 1220 // itself in its initializer. 1221 Diag(L, diag::warn_field_is_uninit); 1222 } 1223 } 1224 1225 bool HasDependentArg = false; 1226 for (unsigned i = 0; i < NumArgs; i++) 1227 HasDependentArg |= Args[i]->isTypeDependent(); 1228 1229 QualType FieldType = Member->getType(); 1230 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1231 FieldType = Array->getElementType(); 1232 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1233 if (FieldType->isDependentType() || HasDependentArg) { 1234 // Can't check initialization for a member of dependent type or when 1235 // any of the arguments are type-dependent expressions. 1236 OwningExprResult Init 1237 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1238 RParenLoc)); 1239 1240 // Erase any temporaries within this evaluation context; we're not 1241 // going to track them in the AST, since we'll be rebuilding the 1242 // ASTs during template instantiation. 1243 ExprTemporaries.erase( 1244 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1245 ExprTemporaries.end()); 1246 1247 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1248 LParenLoc, 1249 Init.takeAs<Expr>(), 1250 RParenLoc); 1251 1252 } 1253 1254 if (Member->isInvalidDecl()) 1255 return true; 1256 1257 // Initialize the member. 1258 InitializedEntity MemberEntity = 1259 InitializedEntity::InitializeMember(Member, 0); 1260 InitializationKind Kind = 1261 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1262 1263 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1264 1265 OwningExprResult MemberInit = 1266 InitSeq.Perform(*this, MemberEntity, Kind, 1267 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1268 if (MemberInit.isInvalid()) 1269 return true; 1270 1271 // C++0x [class.base.init]p7: 1272 // The initialization of each base and member constitutes a 1273 // full-expression. 1274 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1275 if (MemberInit.isInvalid()) 1276 return true; 1277 1278 // If we are in a dependent context, template instantiation will 1279 // perform this type-checking again. Just save the arguments that we 1280 // received in a ParenListExpr. 1281 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1282 // of the information that we have about the member 1283 // initializer. However, deconstructing the ASTs is a dicey process, 1284 // and this approach is far more likely to get the corner cases right. 1285 if (CurContext->isDependentContext()) { 1286 // Bump the reference count of all of the arguments. 1287 for (unsigned I = 0; I != NumArgs; ++I) 1288 Args[I]->Retain(); 1289 1290 OwningExprResult Init 1291 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1292 RParenLoc)); 1293 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1294 LParenLoc, 1295 Init.takeAs<Expr>(), 1296 RParenLoc); 1297 } 1298 1299 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1300 LParenLoc, 1301 MemberInit.takeAs<Expr>(), 1302 RParenLoc); 1303} 1304 1305Sema::MemInitResult 1306Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1307 Expr **Args, unsigned NumArgs, 1308 SourceLocation LParenLoc, SourceLocation RParenLoc, 1309 CXXRecordDecl *ClassDecl) { 1310 bool HasDependentArg = false; 1311 for (unsigned i = 0; i < NumArgs; i++) 1312 HasDependentArg |= Args[i]->isTypeDependent(); 1313 1314 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1315 if (BaseType->isDependentType() || HasDependentArg) { 1316 // Can't check initialization for a base of dependent type or when 1317 // any of the arguments are type-dependent expressions. 1318 OwningExprResult BaseInit 1319 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1320 RParenLoc)); 1321 1322 // Erase any temporaries within this evaluation context; we're not 1323 // going to track them in the AST, since we'll be rebuilding the 1324 // ASTs during template instantiation. 1325 ExprTemporaries.erase( 1326 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1327 ExprTemporaries.end()); 1328 1329 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1330 LParenLoc, 1331 BaseInit.takeAs<Expr>(), 1332 RParenLoc); 1333 } 1334 1335 if (!BaseType->isRecordType()) 1336 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1337 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1338 1339 // C++ [class.base.init]p2: 1340 // [...] Unless the mem-initializer-id names a nonstatic data 1341 // member of the constructor’s class or a direct or virtual base 1342 // of that class, the mem-initializer is ill-formed. A 1343 // mem-initializer-list can initialize a base class using any 1344 // name that denotes that base class type. 1345 1346 // Check for direct and virtual base classes. 1347 const CXXBaseSpecifier *DirectBaseSpec = 0; 1348 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1349 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1350 VirtualBaseSpec); 1351 1352 // C++ [base.class.init]p2: 1353 // If a mem-initializer-id is ambiguous because it designates both 1354 // a direct non-virtual base class and an inherited virtual base 1355 // class, the mem-initializer is ill-formed. 1356 if (DirectBaseSpec && VirtualBaseSpec) 1357 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1358 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1359 // C++ [base.class.init]p2: 1360 // Unless the mem-initializer-id names a nonstatic data membeer of the 1361 // constructor's class ot a direst or virtual base of that class, the 1362 // mem-initializer is ill-formed. 1363 if (!DirectBaseSpec && !VirtualBaseSpec) 1364 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1365 << BaseType << ClassDecl->getNameAsCString() 1366 << BaseTInfo->getTypeLoc().getSourceRange(); 1367 1368 CXXBaseSpecifier *BaseSpec 1369 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1370 if (!BaseSpec) 1371 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1372 1373 // Initialize the base. 1374 InitializedEntity BaseEntity = 1375 InitializedEntity::InitializeBase(Context, BaseSpec); 1376 InitializationKind Kind = 1377 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1378 1379 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1380 1381 OwningExprResult BaseInit = 1382 InitSeq.Perform(*this, BaseEntity, Kind, 1383 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1384 if (BaseInit.isInvalid()) 1385 return true; 1386 1387 // C++0x [class.base.init]p7: 1388 // The initialization of each base and member constitutes a 1389 // full-expression. 1390 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1391 if (BaseInit.isInvalid()) 1392 return true; 1393 1394 // If we are in a dependent context, template instantiation will 1395 // perform this type-checking again. Just save the arguments that we 1396 // received in a ParenListExpr. 1397 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1398 // of the information that we have about the base 1399 // initializer. However, deconstructing the ASTs is a dicey process, 1400 // and this approach is far more likely to get the corner cases right. 1401 if (CurContext->isDependentContext()) { 1402 // Bump the reference count of all of the arguments. 1403 for (unsigned I = 0; I != NumArgs; ++I) 1404 Args[I]->Retain(); 1405 1406 OwningExprResult Init 1407 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1408 RParenLoc)); 1409 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1410 LParenLoc, 1411 Init.takeAs<Expr>(), 1412 RParenLoc); 1413 } 1414 1415 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1416 LParenLoc, 1417 BaseInit.takeAs<Expr>(), 1418 RParenLoc); 1419} 1420 1421bool 1422Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1423 CXXBaseOrMemberInitializer **Initializers, 1424 unsigned NumInitializers, 1425 bool IsImplicitConstructor, 1426 bool AnyErrors) { 1427 // We need to build the initializer AST according to order of construction 1428 // and not what user specified in the Initializers list. 1429 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1430 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1431 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1432 bool HasDependentBaseInit = false; 1433 bool HadError = false; 1434 1435 for (unsigned i = 0; i < NumInitializers; i++) { 1436 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1437 if (Member->isBaseInitializer()) { 1438 if (Member->getBaseClass()->isDependentType()) 1439 HasDependentBaseInit = true; 1440 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1441 } else { 1442 AllBaseFields[Member->getMember()] = Member; 1443 } 1444 } 1445 1446 if (HasDependentBaseInit) { 1447 // FIXME. This does not preserve the ordering of the initializers. 1448 // Try (with -Wreorder) 1449 // template<class X> struct A {}; 1450 // template<class X> struct B : A<X> { 1451 // B() : x1(10), A<X>() {} 1452 // int x1; 1453 // }; 1454 // B<int> x; 1455 // On seeing one dependent type, we should essentially exit this routine 1456 // while preserving user-declared initializer list. When this routine is 1457 // called during instantiatiation process, this routine will rebuild the 1458 // ordered initializer list correctly. 1459 1460 // If we have a dependent base initialization, we can't determine the 1461 // association between initializers and bases; just dump the known 1462 // initializers into the list, and don't try to deal with other bases. 1463 for (unsigned i = 0; i < NumInitializers; i++) { 1464 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1465 if (Member->isBaseInitializer()) 1466 AllToInit.push_back(Member); 1467 } 1468 } else { 1469 llvm::SmallVector<CXXBaseSpecifier *, 4> BasesToDefaultInit; 1470 1471 // Push virtual bases before others. 1472 for (CXXRecordDecl::base_class_iterator VBase = 1473 ClassDecl->vbases_begin(), 1474 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1475 if (VBase->getType()->isDependentType()) 1476 continue; 1477 if (CXXBaseOrMemberInitializer *Value 1478 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1479 AllToInit.push_back(Value); 1480 } else if (!AnyErrors) { 1481 InitializedEntity InitEntity 1482 = InitializedEntity::InitializeBase(Context, VBase); 1483 InitializationKind InitKind 1484 = InitializationKind::CreateDefault(Constructor->getLocation()); 1485 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1486 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1487 MultiExprArg(*this, 0, 0)); 1488 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1489 if (BaseInit.isInvalid()) { 1490 HadError = true; 1491 continue; 1492 } 1493 1494 // Don't attach synthesized base initializers in a dependent 1495 // context; they'll be checked again at template instantiation 1496 // time. 1497 if (CurContext->isDependentContext()) 1498 continue; 1499 1500 CXXBaseOrMemberInitializer *CXXBaseInit = 1501 new (Context) CXXBaseOrMemberInitializer(Context, 1502 Context.getTrivialTypeSourceInfo(VBase->getType(), 1503 SourceLocation()), 1504 SourceLocation(), 1505 BaseInit.takeAs<Expr>(), 1506 SourceLocation()); 1507 AllToInit.push_back(CXXBaseInit); 1508 } 1509 } 1510 1511 for (CXXRecordDecl::base_class_iterator Base = 1512 ClassDecl->bases_begin(), 1513 E = ClassDecl->bases_end(); Base != E; ++Base) { 1514 // Virtuals are in the virtual base list and already constructed. 1515 if (Base->isVirtual()) 1516 continue; 1517 // Skip dependent types. 1518 if (Base->getType()->isDependentType()) 1519 continue; 1520 if (CXXBaseOrMemberInitializer *Value 1521 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1522 AllToInit.push_back(Value); 1523 } 1524 else if (!AnyErrors) { 1525 InitializedEntity InitEntity 1526 = InitializedEntity::InitializeBase(Context, Base); 1527 InitializationKind InitKind 1528 = InitializationKind::CreateDefault(Constructor->getLocation()); 1529 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1530 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1531 MultiExprArg(*this, 0, 0)); 1532 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1533 if (BaseInit.isInvalid()) { 1534 HadError = true; 1535 continue; 1536 } 1537 1538 // Don't attach synthesized base initializers in a dependent 1539 // context; they'll be regenerated at template instantiation 1540 // time. 1541 if (CurContext->isDependentContext()) 1542 continue; 1543 1544 CXXBaseOrMemberInitializer *CXXBaseInit = 1545 new (Context) CXXBaseOrMemberInitializer(Context, 1546 Context.getTrivialTypeSourceInfo(Base->getType(), 1547 SourceLocation()), 1548 SourceLocation(), 1549 BaseInit.takeAs<Expr>(), 1550 SourceLocation()); 1551 AllToInit.push_back(CXXBaseInit); 1552 } 1553 } 1554 } 1555 1556 // non-static data members. 1557 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1558 E = ClassDecl->field_end(); Field != E; ++Field) { 1559 if ((*Field)->isAnonymousStructOrUnion()) { 1560 if (const RecordType *FieldClassType = 1561 Field->getType()->getAs<RecordType>()) { 1562 CXXRecordDecl *FieldClassDecl 1563 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1564 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1565 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1566 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1567 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1568 // set to the anonymous union data member used in the initializer 1569 // list. 1570 Value->setMember(*Field); 1571 Value->setAnonUnionMember(*FA); 1572 AllToInit.push_back(Value); 1573 break; 1574 } 1575 } 1576 } 1577 continue; 1578 } 1579 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1580 AllToInit.push_back(Value); 1581 continue; 1582 } 1583 1584 if ((*Field)->getType()->isDependentType() || AnyErrors) 1585 continue; 1586 1587 QualType FT = Context.getBaseElementType((*Field)->getType()); 1588 if (FT->getAs<RecordType>()) { 1589 InitializedEntity InitEntity 1590 = InitializedEntity::InitializeMember(*Field); 1591 InitializationKind InitKind 1592 = InitializationKind::CreateDefault(Constructor->getLocation()); 1593 1594 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1595 OwningExprResult MemberInit = InitSeq.Perform(*this, InitEntity, InitKind, 1596 MultiExprArg(*this, 0, 0)); 1597 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1598 if (MemberInit.isInvalid()) { 1599 HadError = true; 1600 continue; 1601 } 1602 1603 // Don't attach synthesized member initializers in a dependent 1604 // context; they'll be regenerated a template instantiation 1605 // time. 1606 if (CurContext->isDependentContext()) 1607 continue; 1608 1609 CXXBaseOrMemberInitializer *Member = 1610 new (Context) CXXBaseOrMemberInitializer(Context, 1611 *Field, SourceLocation(), 1612 SourceLocation(), 1613 MemberInit.takeAs<Expr>(), 1614 SourceLocation()); 1615 1616 AllToInit.push_back(Member); 1617 } 1618 else if (FT->isReferenceType()) { 1619 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1620 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1621 << 0 << (*Field)->getDeclName(); 1622 Diag((*Field)->getLocation(), diag::note_declared_at); 1623 HadError = true; 1624 } 1625 else if (FT.isConstQualified()) { 1626 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1627 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1628 << 1 << (*Field)->getDeclName(); 1629 Diag((*Field)->getLocation(), diag::note_declared_at); 1630 HadError = true; 1631 } 1632 } 1633 1634 NumInitializers = AllToInit.size(); 1635 if (NumInitializers > 0) { 1636 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1637 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1638 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1639 1640 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1641 for (unsigned Idx = 0; Idx < NumInitializers; ++Idx) { 1642 CXXBaseOrMemberInitializer *Member = AllToInit[Idx]; 1643 baseOrMemberInitializers[Idx] = Member; 1644 if (!Member->isBaseInitializer()) 1645 continue; 1646 const Type *BaseType = Member->getBaseClass(); 1647 const RecordType *RT = BaseType->getAs<RecordType>(); 1648 if (!RT) 1649 continue; 1650 CXXRecordDecl *BaseClassDecl = 1651 cast<CXXRecordDecl>(RT->getDecl()); 1652 if (BaseClassDecl->hasTrivialDestructor()) 1653 continue; 1654 CXXDestructorDecl *DD = BaseClassDecl->getDestructor(Context); 1655 MarkDeclarationReferenced(Constructor->getLocation(), DD); 1656 } 1657 } 1658 1659 return HadError; 1660} 1661 1662static void *GetKeyForTopLevelField(FieldDecl *Field) { 1663 // For anonymous unions, use the class declaration as the key. 1664 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1665 if (RT->getDecl()->isAnonymousStructOrUnion()) 1666 return static_cast<void *>(RT->getDecl()); 1667 } 1668 return static_cast<void *>(Field); 1669} 1670 1671static void *GetKeyForBase(QualType BaseType) { 1672 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1673 return (void *)RT; 1674 1675 assert(0 && "Unexpected base type!"); 1676 return 0; 1677} 1678 1679static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1680 bool MemberMaybeAnon = false) { 1681 // For fields injected into the class via declaration of an anonymous union, 1682 // use its anonymous union class declaration as the unique key. 1683 if (Member->isMemberInitializer()) { 1684 FieldDecl *Field = Member->getMember(); 1685 1686 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1687 // data member of the class. Data member used in the initializer list is 1688 // in AnonUnionMember field. 1689 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1690 Field = Member->getAnonUnionMember(); 1691 if (Field->getDeclContext()->isRecord()) { 1692 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 1693 if (RD->isAnonymousStructOrUnion()) 1694 return static_cast<void *>(RD); 1695 } 1696 return static_cast<void *>(Field); 1697 } 1698 1699 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1700} 1701 1702/// ActOnMemInitializers - Handle the member initializers for a constructor. 1703void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1704 SourceLocation ColonLoc, 1705 MemInitTy **MemInits, unsigned NumMemInits, 1706 bool AnyErrors) { 1707 if (!ConstructorDecl) 1708 return; 1709 1710 AdjustDeclIfTemplate(ConstructorDecl); 1711 1712 CXXConstructorDecl *Constructor 1713 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1714 1715 if (!Constructor) { 1716 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1717 return; 1718 } 1719 1720 if (!Constructor->isDependentContext()) { 1721 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 1722 bool err = false; 1723 for (unsigned i = 0; i < NumMemInits; i++) { 1724 CXXBaseOrMemberInitializer *Member = 1725 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1726 void *KeyToMember = GetKeyForMember(Member); 1727 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1728 if (!PrevMember) { 1729 PrevMember = Member; 1730 continue; 1731 } 1732 if (FieldDecl *Field = Member->getMember()) 1733 Diag(Member->getSourceLocation(), 1734 diag::error_multiple_mem_initialization) 1735 << Field->getNameAsString() 1736 << Member->getSourceRange(); 1737 else { 1738 Type *BaseClass = Member->getBaseClass(); 1739 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1740 Diag(Member->getSourceLocation(), 1741 diag::error_multiple_base_initialization) 1742 << QualType(BaseClass, 0) 1743 << Member->getSourceRange(); 1744 } 1745 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1746 << 0; 1747 err = true; 1748 } 1749 1750 if (err) 1751 return; 1752 } 1753 1754 SetBaseOrMemberInitializers(Constructor, 1755 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 1756 NumMemInits, false, AnyErrors); 1757 1758 if (Constructor->isDependentContext()) 1759 return; 1760 1761 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1762 Diagnostic::Ignored && 1763 Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1764 Diagnostic::Ignored) 1765 return; 1766 1767 // Also issue warning if order of ctor-initializer list does not match order 1768 // of 1) base class declarations and 2) order of non-static data members. 1769 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1770 1771 CXXRecordDecl *ClassDecl 1772 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1773 // Push virtual bases before others. 1774 for (CXXRecordDecl::base_class_iterator VBase = 1775 ClassDecl->vbases_begin(), 1776 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1777 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1778 1779 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1780 E = ClassDecl->bases_end(); Base != E; ++Base) { 1781 // Virtuals are alread in the virtual base list and are constructed 1782 // first. 1783 if (Base->isVirtual()) 1784 continue; 1785 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1786 } 1787 1788 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1789 E = ClassDecl->field_end(); Field != E; ++Field) 1790 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1791 1792 int Last = AllBaseOrMembers.size(); 1793 int curIndex = 0; 1794 CXXBaseOrMemberInitializer *PrevMember = 0; 1795 for (unsigned i = 0; i < NumMemInits; i++) { 1796 CXXBaseOrMemberInitializer *Member = 1797 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1798 void *MemberInCtorList = GetKeyForMember(Member, true); 1799 1800 for (; curIndex < Last; curIndex++) 1801 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1802 break; 1803 if (curIndex == Last) { 1804 assert(PrevMember && "Member not in member list?!"); 1805 // Initializer as specified in ctor-initializer list is out of order. 1806 // Issue a warning diagnostic. 1807 if (PrevMember->isBaseInitializer()) { 1808 // Diagnostics is for an initialized base class. 1809 Type *BaseClass = PrevMember->getBaseClass(); 1810 Diag(PrevMember->getSourceLocation(), 1811 diag::warn_base_initialized) 1812 << QualType(BaseClass, 0); 1813 } else { 1814 FieldDecl *Field = PrevMember->getMember(); 1815 Diag(PrevMember->getSourceLocation(), 1816 diag::warn_field_initialized) 1817 << Field->getNameAsString(); 1818 } 1819 // Also the note! 1820 if (FieldDecl *Field = Member->getMember()) 1821 Diag(Member->getSourceLocation(), 1822 diag::note_fieldorbase_initialized_here) << 0 1823 << Field->getNameAsString(); 1824 else { 1825 Type *BaseClass = Member->getBaseClass(); 1826 Diag(Member->getSourceLocation(), 1827 diag::note_fieldorbase_initialized_here) << 1 1828 << QualType(BaseClass, 0); 1829 } 1830 for (curIndex = 0; curIndex < Last; curIndex++) 1831 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1832 break; 1833 } 1834 PrevMember = Member; 1835 } 1836} 1837 1838void 1839Sema::MarkBaseAndMemberDestructorsReferenced(CXXDestructorDecl *Destructor) { 1840 // Ignore dependent destructors. 1841 if (Destructor->isDependentContext()) 1842 return; 1843 1844 CXXRecordDecl *ClassDecl = Destructor->getParent(); 1845 1846 // Non-static data members. 1847 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1848 E = ClassDecl->field_end(); I != E; ++I) { 1849 FieldDecl *Field = *I; 1850 1851 QualType FieldType = Context.getBaseElementType(Field->getType()); 1852 1853 const RecordType* RT = FieldType->getAs<RecordType>(); 1854 if (!RT) 1855 continue; 1856 1857 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1858 if (FieldClassDecl->hasTrivialDestructor()) 1859 continue; 1860 1861 const CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1862 MarkDeclarationReferenced(Destructor->getLocation(), 1863 const_cast<CXXDestructorDecl*>(Dtor)); 1864 } 1865 1866 // Bases. 1867 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1868 E = ClassDecl->bases_end(); Base != E; ++Base) { 1869 // Ignore virtual bases. 1870 if (Base->isVirtual()) 1871 continue; 1872 1873 // Ignore trivial destructors. 1874 CXXRecordDecl *BaseClassDecl 1875 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1876 if (BaseClassDecl->hasTrivialDestructor()) 1877 continue; 1878 1879 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1880 MarkDeclarationReferenced(Destructor->getLocation(), 1881 const_cast<CXXDestructorDecl*>(Dtor)); 1882 } 1883 1884 // Virtual bases. 1885 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1886 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1887 // Ignore trivial destructors. 1888 CXXRecordDecl *BaseClassDecl 1889 = cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1890 if (BaseClassDecl->hasTrivialDestructor()) 1891 continue; 1892 1893 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1894 MarkDeclarationReferenced(Destructor->getLocation(), 1895 const_cast<CXXDestructorDecl*>(Dtor)); 1896 } 1897} 1898 1899void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1900 if (!CDtorDecl) 1901 return; 1902 1903 AdjustDeclIfTemplate(CDtorDecl); 1904 1905 if (CXXConstructorDecl *Constructor 1906 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1907 SetBaseOrMemberInitializers(Constructor, 0, 0, false, false); 1908} 1909 1910namespace { 1911 /// PureVirtualMethodCollector - traverses a class and its superclasses 1912 /// and determines if it has any pure virtual methods. 1913 class PureVirtualMethodCollector { 1914 ASTContext &Context; 1915 1916 public: 1917 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1918 1919 private: 1920 MethodList Methods; 1921 1922 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1923 1924 public: 1925 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1926 : Context(Ctx) { 1927 1928 MethodList List; 1929 Collect(RD, List); 1930 1931 // Copy the temporary list to methods, and make sure to ignore any 1932 // null entries. 1933 for (size_t i = 0, e = List.size(); i != e; ++i) { 1934 if (List[i]) 1935 Methods.push_back(List[i]); 1936 } 1937 } 1938 1939 bool empty() const { return Methods.empty(); } 1940 1941 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1942 MethodList::const_iterator methods_end() { return Methods.end(); } 1943 }; 1944 1945 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1946 MethodList& Methods) { 1947 // First, collect the pure virtual methods for the base classes. 1948 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1949 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1950 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1951 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1952 if (BaseDecl && BaseDecl->isAbstract()) 1953 Collect(BaseDecl, Methods); 1954 } 1955 } 1956 1957 // Next, zero out any pure virtual methods that this class overrides. 1958 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1959 1960 MethodSetTy OverriddenMethods; 1961 size_t MethodsSize = Methods.size(); 1962 1963 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1964 i != e; ++i) { 1965 // Traverse the record, looking for methods. 1966 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1967 // If the method is pure virtual, add it to the methods vector. 1968 if (MD->isPure()) 1969 Methods.push_back(MD); 1970 1971 // Record all the overridden methods in our set. 1972 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1973 E = MD->end_overridden_methods(); I != E; ++I) { 1974 // Keep track of the overridden methods. 1975 OverriddenMethods.insert(*I); 1976 } 1977 } 1978 } 1979 1980 // Now go through the methods and zero out all the ones we know are 1981 // overridden. 1982 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1983 if (OverriddenMethods.count(Methods[i])) 1984 Methods[i] = 0; 1985 } 1986 1987 } 1988} 1989 1990 1991bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1992 unsigned DiagID, AbstractDiagSelID SelID, 1993 const CXXRecordDecl *CurrentRD) { 1994 if (SelID == -1) 1995 return RequireNonAbstractType(Loc, T, 1996 PDiag(DiagID), CurrentRD); 1997 else 1998 return RequireNonAbstractType(Loc, T, 1999 PDiag(DiagID) << SelID, CurrentRD); 2000} 2001 2002bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2003 const PartialDiagnostic &PD, 2004 const CXXRecordDecl *CurrentRD) { 2005 if (!getLangOptions().CPlusPlus) 2006 return false; 2007 2008 if (const ArrayType *AT = Context.getAsArrayType(T)) 2009 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2010 CurrentRD); 2011 2012 if (const PointerType *PT = T->getAs<PointerType>()) { 2013 // Find the innermost pointer type. 2014 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2015 PT = T; 2016 2017 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2018 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2019 } 2020 2021 const RecordType *RT = T->getAs<RecordType>(); 2022 if (!RT) 2023 return false; 2024 2025 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2026 2027 if (CurrentRD && CurrentRD != RD) 2028 return false; 2029 2030 // FIXME: is this reasonable? It matches current behavior, but.... 2031 if (!RD->getDefinition()) 2032 return false; 2033 2034 if (!RD->isAbstract()) 2035 return false; 2036 2037 Diag(Loc, PD) << RD->getDeclName(); 2038 2039 // Check if we've already emitted the list of pure virtual functions for this 2040 // class. 2041 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2042 return true; 2043 2044 PureVirtualMethodCollector Collector(Context, RD); 2045 2046 for (PureVirtualMethodCollector::MethodList::const_iterator I = 2047 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 2048 const CXXMethodDecl *MD = *I; 2049 2050 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 2051 MD->getDeclName(); 2052 } 2053 2054 if (!PureVirtualClassDiagSet) 2055 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2056 PureVirtualClassDiagSet->insert(RD); 2057 2058 return true; 2059} 2060 2061namespace { 2062 class AbstractClassUsageDiagnoser 2063 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2064 Sema &SemaRef; 2065 CXXRecordDecl *AbstractClass; 2066 2067 bool VisitDeclContext(const DeclContext *DC) { 2068 bool Invalid = false; 2069 2070 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2071 E = DC->decls_end(); I != E; ++I) 2072 Invalid |= Visit(*I); 2073 2074 return Invalid; 2075 } 2076 2077 public: 2078 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2079 : SemaRef(SemaRef), AbstractClass(ac) { 2080 Visit(SemaRef.Context.getTranslationUnitDecl()); 2081 } 2082 2083 bool VisitFunctionDecl(const FunctionDecl *FD) { 2084 if (FD->isThisDeclarationADefinition()) { 2085 // No need to do the check if we're in a definition, because it requires 2086 // that the return/param types are complete. 2087 // because that requires 2088 return VisitDeclContext(FD); 2089 } 2090 2091 // Check the return type. 2092 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2093 bool Invalid = 2094 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2095 diag::err_abstract_type_in_decl, 2096 Sema::AbstractReturnType, 2097 AbstractClass); 2098 2099 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2100 E = FD->param_end(); I != E; ++I) { 2101 const ParmVarDecl *VD = *I; 2102 Invalid |= 2103 SemaRef.RequireNonAbstractType(VD->getLocation(), 2104 VD->getOriginalType(), 2105 diag::err_abstract_type_in_decl, 2106 Sema::AbstractParamType, 2107 AbstractClass); 2108 } 2109 2110 return Invalid; 2111 } 2112 2113 bool VisitDecl(const Decl* D) { 2114 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2115 return VisitDeclContext(DC); 2116 2117 return false; 2118 } 2119 }; 2120} 2121 2122/// \brief Perform semantic checks on a class definition that has been 2123/// completing, introducing implicitly-declared members, checking for 2124/// abstract types, etc. 2125void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2126 if (!Record || Record->isInvalidDecl()) 2127 return; 2128 2129 if (!Record->isDependentType()) 2130 AddImplicitlyDeclaredMembersToClass(Record); 2131 2132 if (Record->isInvalidDecl()) 2133 return; 2134 2135 // Set access bits correctly on the directly-declared conversions. 2136 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2137 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2138 Convs->setAccess(I, (*I)->getAccess()); 2139 2140 if (!Record->isAbstract()) { 2141 // Collect all the pure virtual methods and see if this is an abstract 2142 // class after all. 2143 PureVirtualMethodCollector Collector(Context, Record); 2144 if (!Collector.empty()) 2145 Record->setAbstract(true); 2146 } 2147 2148 if (Record->isAbstract()) 2149 (void)AbstractClassUsageDiagnoser(*this, Record); 2150} 2151 2152void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2153 DeclPtrTy TagDecl, 2154 SourceLocation LBrac, 2155 SourceLocation RBrac) { 2156 if (!TagDecl) 2157 return; 2158 2159 AdjustDeclIfTemplate(TagDecl); 2160 2161 ActOnFields(S, RLoc, TagDecl, 2162 (DeclPtrTy*)FieldCollector->getCurFields(), 2163 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 2164 2165 CheckCompletedCXXClass( 2166 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2167} 2168 2169/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2170/// special functions, such as the default constructor, copy 2171/// constructor, or destructor, to the given C++ class (C++ 2172/// [special]p1). This routine can only be executed just before the 2173/// definition of the class is complete. 2174void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2175 CanQualType ClassType 2176 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2177 2178 // FIXME: Implicit declarations have exception specifications, which are 2179 // the union of the specifications of the implicitly called functions. 2180 2181 if (!ClassDecl->hasUserDeclaredConstructor()) { 2182 // C++ [class.ctor]p5: 2183 // A default constructor for a class X is a constructor of class X 2184 // that can be called without an argument. If there is no 2185 // user-declared constructor for class X, a default constructor is 2186 // implicitly declared. An implicitly-declared default constructor 2187 // is an inline public member of its class. 2188 DeclarationName Name 2189 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2190 CXXConstructorDecl *DefaultCon = 2191 CXXConstructorDecl::Create(Context, ClassDecl, 2192 ClassDecl->getLocation(), Name, 2193 Context.getFunctionType(Context.VoidTy, 2194 0, 0, false, 0, 2195 /*FIXME*/false, false, 2196 0, 0, false, 2197 CC_Default), 2198 /*TInfo=*/0, 2199 /*isExplicit=*/false, 2200 /*isInline=*/true, 2201 /*isImplicitlyDeclared=*/true); 2202 DefaultCon->setAccess(AS_public); 2203 DefaultCon->setImplicit(); 2204 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2205 ClassDecl->addDecl(DefaultCon); 2206 } 2207 2208 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2209 // C++ [class.copy]p4: 2210 // If the class definition does not explicitly declare a copy 2211 // constructor, one is declared implicitly. 2212 2213 // C++ [class.copy]p5: 2214 // The implicitly-declared copy constructor for a class X will 2215 // have the form 2216 // 2217 // X::X(const X&) 2218 // 2219 // if 2220 bool HasConstCopyConstructor = true; 2221 2222 // -- each direct or virtual base class B of X has a copy 2223 // constructor whose first parameter is of type const B& or 2224 // const volatile B&, and 2225 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2226 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2227 const CXXRecordDecl *BaseClassDecl 2228 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2229 HasConstCopyConstructor 2230 = BaseClassDecl->hasConstCopyConstructor(Context); 2231 } 2232 2233 // -- for all the nonstatic data members of X that are of a 2234 // class type M (or array thereof), each such class type 2235 // has a copy constructor whose first parameter is of type 2236 // const M& or const volatile M&. 2237 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2238 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2239 ++Field) { 2240 QualType FieldType = (*Field)->getType(); 2241 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2242 FieldType = Array->getElementType(); 2243 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2244 const CXXRecordDecl *FieldClassDecl 2245 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2246 HasConstCopyConstructor 2247 = FieldClassDecl->hasConstCopyConstructor(Context); 2248 } 2249 } 2250 2251 // Otherwise, the implicitly declared copy constructor will have 2252 // the form 2253 // 2254 // X::X(X&) 2255 QualType ArgType = ClassType; 2256 if (HasConstCopyConstructor) 2257 ArgType = ArgType.withConst(); 2258 ArgType = Context.getLValueReferenceType(ArgType); 2259 2260 // An implicitly-declared copy constructor is an inline public 2261 // member of its class. 2262 DeclarationName Name 2263 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2264 CXXConstructorDecl *CopyConstructor 2265 = CXXConstructorDecl::Create(Context, ClassDecl, 2266 ClassDecl->getLocation(), Name, 2267 Context.getFunctionType(Context.VoidTy, 2268 &ArgType, 1, 2269 false, 0, 2270 /*FIXME:*/false, 2271 false, 0, 0, false, 2272 CC_Default), 2273 /*TInfo=*/0, 2274 /*isExplicit=*/false, 2275 /*isInline=*/true, 2276 /*isImplicitlyDeclared=*/true); 2277 CopyConstructor->setAccess(AS_public); 2278 CopyConstructor->setImplicit(); 2279 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2280 2281 // Add the parameter to the constructor. 2282 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2283 ClassDecl->getLocation(), 2284 /*IdentifierInfo=*/0, 2285 ArgType, /*TInfo=*/0, 2286 VarDecl::None, 0); 2287 CopyConstructor->setParams(&FromParam, 1); 2288 ClassDecl->addDecl(CopyConstructor); 2289 } 2290 2291 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2292 // Note: The following rules are largely analoguous to the copy 2293 // constructor rules. Note that virtual bases are not taken into account 2294 // for determining the argument type of the operator. Note also that 2295 // operators taking an object instead of a reference are allowed. 2296 // 2297 // C++ [class.copy]p10: 2298 // If the class definition does not explicitly declare a copy 2299 // assignment operator, one is declared implicitly. 2300 // The implicitly-defined copy assignment operator for a class X 2301 // will have the form 2302 // 2303 // X& X::operator=(const X&) 2304 // 2305 // if 2306 bool HasConstCopyAssignment = true; 2307 2308 // -- each direct base class B of X has a copy assignment operator 2309 // whose parameter is of type const B&, const volatile B& or B, 2310 // and 2311 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2312 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2313 assert(!Base->getType()->isDependentType() && 2314 "Cannot generate implicit members for class with dependent bases."); 2315 const CXXRecordDecl *BaseClassDecl 2316 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2317 const CXXMethodDecl *MD = 0; 2318 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2319 MD); 2320 } 2321 2322 // -- for all the nonstatic data members of X that are of a class 2323 // type M (or array thereof), each such class type has a copy 2324 // assignment operator whose parameter is of type const M&, 2325 // const volatile M& or M. 2326 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2327 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2328 ++Field) { 2329 QualType FieldType = (*Field)->getType(); 2330 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2331 FieldType = Array->getElementType(); 2332 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2333 const CXXRecordDecl *FieldClassDecl 2334 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2335 const CXXMethodDecl *MD = 0; 2336 HasConstCopyAssignment 2337 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2338 } 2339 } 2340 2341 // Otherwise, the implicitly declared copy assignment operator will 2342 // have the form 2343 // 2344 // X& X::operator=(X&) 2345 QualType ArgType = ClassType; 2346 QualType RetType = Context.getLValueReferenceType(ArgType); 2347 if (HasConstCopyAssignment) 2348 ArgType = ArgType.withConst(); 2349 ArgType = Context.getLValueReferenceType(ArgType); 2350 2351 // An implicitly-declared copy assignment operator is an inline public 2352 // member of its class. 2353 DeclarationName Name = 2354 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2355 CXXMethodDecl *CopyAssignment = 2356 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2357 Context.getFunctionType(RetType, &ArgType, 1, 2358 false, 0, 2359 /*FIXME:*/false, 2360 false, 0, 0, false, 2361 CC_Default), 2362 /*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2363 CopyAssignment->setAccess(AS_public); 2364 CopyAssignment->setImplicit(); 2365 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2366 CopyAssignment->setCopyAssignment(true); 2367 2368 // Add the parameter to the operator. 2369 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2370 ClassDecl->getLocation(), 2371 /*IdentifierInfo=*/0, 2372 ArgType, /*TInfo=*/0, 2373 VarDecl::None, 0); 2374 CopyAssignment->setParams(&FromParam, 1); 2375 2376 // Don't call addedAssignmentOperator. There is no way to distinguish an 2377 // implicit from an explicit assignment operator. 2378 ClassDecl->addDecl(CopyAssignment); 2379 AddOverriddenMethods(ClassDecl, CopyAssignment); 2380 } 2381 2382 if (!ClassDecl->hasUserDeclaredDestructor()) { 2383 // C++ [class.dtor]p2: 2384 // If a class has no user-declared destructor, a destructor is 2385 // declared implicitly. An implicitly-declared destructor is an 2386 // inline public member of its class. 2387 DeclarationName Name 2388 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2389 CXXDestructorDecl *Destructor 2390 = CXXDestructorDecl::Create(Context, ClassDecl, 2391 ClassDecl->getLocation(), Name, 2392 Context.getFunctionType(Context.VoidTy, 2393 0, 0, false, 0, 2394 /*FIXME:*/false, 2395 false, 0, 0, false, 2396 CC_Default), 2397 /*isInline=*/true, 2398 /*isImplicitlyDeclared=*/true); 2399 Destructor->setAccess(AS_public); 2400 Destructor->setImplicit(); 2401 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2402 ClassDecl->addDecl(Destructor); 2403 2404 AddOverriddenMethods(ClassDecl, Destructor); 2405 } 2406} 2407 2408void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2409 Decl *D = TemplateD.getAs<Decl>(); 2410 if (!D) 2411 return; 2412 2413 TemplateParameterList *Params = 0; 2414 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2415 Params = Template->getTemplateParameters(); 2416 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2417 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2418 Params = PartialSpec->getTemplateParameters(); 2419 else 2420 return; 2421 2422 for (TemplateParameterList::iterator Param = Params->begin(), 2423 ParamEnd = Params->end(); 2424 Param != ParamEnd; ++Param) { 2425 NamedDecl *Named = cast<NamedDecl>(*Param); 2426 if (Named->getDeclName()) { 2427 S->AddDecl(DeclPtrTy::make(Named)); 2428 IdResolver.AddDecl(Named); 2429 } 2430 } 2431} 2432 2433void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2434 if (!RecordD) return; 2435 AdjustDeclIfTemplate(RecordD); 2436 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2437 PushDeclContext(S, Record); 2438} 2439 2440void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2441 if (!RecordD) return; 2442 PopDeclContext(); 2443} 2444 2445/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2446/// parsing a top-level (non-nested) C++ class, and we are now 2447/// parsing those parts of the given Method declaration that could 2448/// not be parsed earlier (C++ [class.mem]p2), such as default 2449/// arguments. This action should enter the scope of the given 2450/// Method declaration as if we had just parsed the qualified method 2451/// name. However, it should not bring the parameters into scope; 2452/// that will be performed by ActOnDelayedCXXMethodParameter. 2453void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2454} 2455 2456/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2457/// C++ method declaration. We're (re-)introducing the given 2458/// function parameter into scope for use in parsing later parts of 2459/// the method declaration. For example, we could see an 2460/// ActOnParamDefaultArgument event for this parameter. 2461void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2462 if (!ParamD) 2463 return; 2464 2465 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2466 2467 // If this parameter has an unparsed default argument, clear it out 2468 // to make way for the parsed default argument. 2469 if (Param->hasUnparsedDefaultArg()) 2470 Param->setDefaultArg(0); 2471 2472 S->AddDecl(DeclPtrTy::make(Param)); 2473 if (Param->getDeclName()) 2474 IdResolver.AddDecl(Param); 2475} 2476 2477/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2478/// processing the delayed method declaration for Method. The method 2479/// declaration is now considered finished. There may be a separate 2480/// ActOnStartOfFunctionDef action later (not necessarily 2481/// immediately!) for this method, if it was also defined inside the 2482/// class body. 2483void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2484 if (!MethodD) 2485 return; 2486 2487 AdjustDeclIfTemplate(MethodD); 2488 2489 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2490 2491 // Now that we have our default arguments, check the constructor 2492 // again. It could produce additional diagnostics or affect whether 2493 // the class has implicitly-declared destructors, among other 2494 // things. 2495 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2496 CheckConstructor(Constructor); 2497 2498 // Check the default arguments, which we may have added. 2499 if (!Method->isInvalidDecl()) 2500 CheckCXXDefaultArguments(Method); 2501} 2502 2503/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2504/// the well-formedness of the constructor declarator @p D with type @p 2505/// R. If there are any errors in the declarator, this routine will 2506/// emit diagnostics and set the invalid bit to true. In any case, the type 2507/// will be updated to reflect a well-formed type for the constructor and 2508/// returned. 2509QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2510 FunctionDecl::StorageClass &SC) { 2511 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2512 2513 // C++ [class.ctor]p3: 2514 // A constructor shall not be virtual (10.3) or static (9.4). A 2515 // constructor can be invoked for a const, volatile or const 2516 // volatile object. A constructor shall not be declared const, 2517 // volatile, or const volatile (9.3.2). 2518 if (isVirtual) { 2519 if (!D.isInvalidType()) 2520 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2521 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2522 << SourceRange(D.getIdentifierLoc()); 2523 D.setInvalidType(); 2524 } 2525 if (SC == FunctionDecl::Static) { 2526 if (!D.isInvalidType()) 2527 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2528 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2529 << SourceRange(D.getIdentifierLoc()); 2530 D.setInvalidType(); 2531 SC = FunctionDecl::None; 2532 } 2533 2534 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2535 if (FTI.TypeQuals != 0) { 2536 if (FTI.TypeQuals & Qualifiers::Const) 2537 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2538 << "const" << SourceRange(D.getIdentifierLoc()); 2539 if (FTI.TypeQuals & Qualifiers::Volatile) 2540 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2541 << "volatile" << SourceRange(D.getIdentifierLoc()); 2542 if (FTI.TypeQuals & Qualifiers::Restrict) 2543 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2544 << "restrict" << SourceRange(D.getIdentifierLoc()); 2545 } 2546 2547 // Rebuild the function type "R" without any type qualifiers (in 2548 // case any of the errors above fired) and with "void" as the 2549 // return type, since constructors don't have return types. We 2550 // *always* have to do this, because GetTypeForDeclarator will 2551 // put in a result type of "int" when none was specified. 2552 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2553 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2554 Proto->getNumArgs(), 2555 Proto->isVariadic(), 0, 2556 Proto->hasExceptionSpec(), 2557 Proto->hasAnyExceptionSpec(), 2558 Proto->getNumExceptions(), 2559 Proto->exception_begin(), 2560 Proto->getNoReturnAttr(), 2561 Proto->getCallConv()); 2562} 2563 2564/// CheckConstructor - Checks a fully-formed constructor for 2565/// well-formedness, issuing any diagnostics required. Returns true if 2566/// the constructor declarator is invalid. 2567void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2568 CXXRecordDecl *ClassDecl 2569 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2570 if (!ClassDecl) 2571 return Constructor->setInvalidDecl(); 2572 2573 // C++ [class.copy]p3: 2574 // A declaration of a constructor for a class X is ill-formed if 2575 // its first parameter is of type (optionally cv-qualified) X and 2576 // either there are no other parameters or else all other 2577 // parameters have default arguments. 2578 if (!Constructor->isInvalidDecl() && 2579 ((Constructor->getNumParams() == 1) || 2580 (Constructor->getNumParams() > 1 && 2581 Constructor->getParamDecl(1)->hasDefaultArg())) && 2582 Constructor->getTemplateSpecializationKind() 2583 != TSK_ImplicitInstantiation) { 2584 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2585 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2586 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2587 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2588 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2589 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 2590 2591 // FIXME: Rather that making the constructor invalid, we should endeavor 2592 // to fix the type. 2593 Constructor->setInvalidDecl(); 2594 } 2595 } 2596 2597 // Notify the class that we've added a constructor. 2598 ClassDecl->addedConstructor(Context, Constructor); 2599} 2600 2601/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2602/// issuing any diagnostics required. Returns true on error. 2603bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2604 CXXRecordDecl *RD = Destructor->getParent(); 2605 2606 if (Destructor->isVirtual()) { 2607 SourceLocation Loc; 2608 2609 if (!Destructor->isImplicit()) 2610 Loc = Destructor->getLocation(); 2611 else 2612 Loc = RD->getLocation(); 2613 2614 // If we have a virtual destructor, look up the deallocation function 2615 FunctionDecl *OperatorDelete = 0; 2616 DeclarationName Name = 2617 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2618 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2619 return true; 2620 2621 Destructor->setOperatorDelete(OperatorDelete); 2622 } 2623 2624 return false; 2625} 2626 2627static inline bool 2628FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2629 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2630 FTI.ArgInfo[0].Param && 2631 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2632} 2633 2634/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2635/// the well-formednes of the destructor declarator @p D with type @p 2636/// R. If there are any errors in the declarator, this routine will 2637/// emit diagnostics and set the declarator to invalid. Even if this happens, 2638/// will be updated to reflect a well-formed type for the destructor and 2639/// returned. 2640QualType Sema::CheckDestructorDeclarator(Declarator &D, 2641 FunctionDecl::StorageClass& SC) { 2642 // C++ [class.dtor]p1: 2643 // [...] A typedef-name that names a class is a class-name 2644 // (7.1.3); however, a typedef-name that names a class shall not 2645 // be used as the identifier in the declarator for a destructor 2646 // declaration. 2647 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2648 if (isa<TypedefType>(DeclaratorType)) { 2649 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2650 << DeclaratorType; 2651 D.setInvalidType(); 2652 } 2653 2654 // C++ [class.dtor]p2: 2655 // A destructor is used to destroy objects of its class type. A 2656 // destructor takes no parameters, and no return type can be 2657 // specified for it (not even void). The address of a destructor 2658 // shall not be taken. A destructor shall not be static. A 2659 // destructor can be invoked for a const, volatile or const 2660 // volatile object. A destructor shall not be declared const, 2661 // volatile or const volatile (9.3.2). 2662 if (SC == FunctionDecl::Static) { 2663 if (!D.isInvalidType()) 2664 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2665 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2666 << SourceRange(D.getIdentifierLoc()); 2667 SC = FunctionDecl::None; 2668 D.setInvalidType(); 2669 } 2670 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2671 // Destructors don't have return types, but the parser will 2672 // happily parse something like: 2673 // 2674 // class X { 2675 // float ~X(); 2676 // }; 2677 // 2678 // The return type will be eliminated later. 2679 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2680 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2681 << SourceRange(D.getIdentifierLoc()); 2682 } 2683 2684 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2685 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2686 if (FTI.TypeQuals & Qualifiers::Const) 2687 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2688 << "const" << SourceRange(D.getIdentifierLoc()); 2689 if (FTI.TypeQuals & Qualifiers::Volatile) 2690 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2691 << "volatile" << SourceRange(D.getIdentifierLoc()); 2692 if (FTI.TypeQuals & Qualifiers::Restrict) 2693 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2694 << "restrict" << SourceRange(D.getIdentifierLoc()); 2695 D.setInvalidType(); 2696 } 2697 2698 // Make sure we don't have any parameters. 2699 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2700 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2701 2702 // Delete the parameters. 2703 FTI.freeArgs(); 2704 D.setInvalidType(); 2705 } 2706 2707 // Make sure the destructor isn't variadic. 2708 if (FTI.isVariadic) { 2709 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2710 D.setInvalidType(); 2711 } 2712 2713 // Rebuild the function type "R" without any type qualifiers or 2714 // parameters (in case any of the errors above fired) and with 2715 // "void" as the return type, since destructors don't have return 2716 // types. We *always* have to do this, because GetTypeForDeclarator 2717 // will put in a result type of "int" when none was specified. 2718 // FIXME: Exceptions! 2719 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 2720 false, false, 0, 0, false, CC_Default); 2721} 2722 2723/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2724/// well-formednes of the conversion function declarator @p D with 2725/// type @p R. If there are any errors in the declarator, this routine 2726/// will emit diagnostics and return true. Otherwise, it will return 2727/// false. Either way, the type @p R will be updated to reflect a 2728/// well-formed type for the conversion operator. 2729void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2730 FunctionDecl::StorageClass& SC) { 2731 // C++ [class.conv.fct]p1: 2732 // Neither parameter types nor return type can be specified. The 2733 // type of a conversion function (8.3.5) is "function taking no 2734 // parameter returning conversion-type-id." 2735 if (SC == FunctionDecl::Static) { 2736 if (!D.isInvalidType()) 2737 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2738 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2739 << SourceRange(D.getIdentifierLoc()); 2740 D.setInvalidType(); 2741 SC = FunctionDecl::None; 2742 } 2743 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2744 // Conversion functions don't have return types, but the parser will 2745 // happily parse something like: 2746 // 2747 // class X { 2748 // float operator bool(); 2749 // }; 2750 // 2751 // The return type will be changed later anyway. 2752 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2753 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2754 << SourceRange(D.getIdentifierLoc()); 2755 } 2756 2757 // Make sure we don't have any parameters. 2758 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2759 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2760 2761 // Delete the parameters. 2762 D.getTypeObject(0).Fun.freeArgs(); 2763 D.setInvalidType(); 2764 } 2765 2766 // Make sure the conversion function isn't variadic. 2767 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2768 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2769 D.setInvalidType(); 2770 } 2771 2772 // C++ [class.conv.fct]p4: 2773 // The conversion-type-id shall not represent a function type nor 2774 // an array type. 2775 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2776 if (ConvType->isArrayType()) { 2777 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2778 ConvType = Context.getPointerType(ConvType); 2779 D.setInvalidType(); 2780 } else if (ConvType->isFunctionType()) { 2781 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2782 ConvType = Context.getPointerType(ConvType); 2783 D.setInvalidType(); 2784 } 2785 2786 // Rebuild the function type "R" without any parameters (in case any 2787 // of the errors above fired) and with the conversion type as the 2788 // return type. 2789 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2790 R = Context.getFunctionType(ConvType, 0, 0, false, 2791 Proto->getTypeQuals(), 2792 Proto->hasExceptionSpec(), 2793 Proto->hasAnyExceptionSpec(), 2794 Proto->getNumExceptions(), 2795 Proto->exception_begin(), 2796 Proto->getNoReturnAttr(), 2797 Proto->getCallConv()); 2798 2799 // C++0x explicit conversion operators. 2800 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2801 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2802 diag::warn_explicit_conversion_functions) 2803 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2804} 2805 2806/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2807/// the declaration of the given C++ conversion function. This routine 2808/// is responsible for recording the conversion function in the C++ 2809/// class, if possible. 2810Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2811 assert(Conversion && "Expected to receive a conversion function declaration"); 2812 2813 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2814 2815 // Make sure we aren't redeclaring the conversion function. 2816 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2817 2818 // C++ [class.conv.fct]p1: 2819 // [...] A conversion function is never used to convert a 2820 // (possibly cv-qualified) object to the (possibly cv-qualified) 2821 // same object type (or a reference to it), to a (possibly 2822 // cv-qualified) base class of that type (or a reference to it), 2823 // or to (possibly cv-qualified) void. 2824 // FIXME: Suppress this warning if the conversion function ends up being a 2825 // virtual function that overrides a virtual function in a base class. 2826 QualType ClassType 2827 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2828 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2829 ConvType = ConvTypeRef->getPointeeType(); 2830 if (ConvType->isRecordType()) { 2831 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2832 if (ConvType == ClassType) 2833 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2834 << ClassType; 2835 else if (IsDerivedFrom(ClassType, ConvType)) 2836 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2837 << ClassType << ConvType; 2838 } else if (ConvType->isVoidType()) { 2839 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2840 << ClassType << ConvType; 2841 } 2842 2843 if (Conversion->getPrimaryTemplate()) { 2844 // ignore specializations 2845 } else if (Conversion->getPreviousDeclaration()) { 2846 if (FunctionTemplateDecl *ConversionTemplate 2847 = Conversion->getDescribedFunctionTemplate()) { 2848 if (ClassDecl->replaceConversion( 2849 ConversionTemplate->getPreviousDeclaration(), 2850 ConversionTemplate)) 2851 return DeclPtrTy::make(ConversionTemplate); 2852 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 2853 Conversion)) 2854 return DeclPtrTy::make(Conversion); 2855 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2856 } else if (FunctionTemplateDecl *ConversionTemplate 2857 = Conversion->getDescribedFunctionTemplate()) 2858 ClassDecl->addConversionFunction(ConversionTemplate); 2859 else 2860 ClassDecl->addConversionFunction(Conversion); 2861 2862 return DeclPtrTy::make(Conversion); 2863} 2864 2865//===----------------------------------------------------------------------===// 2866// Namespace Handling 2867//===----------------------------------------------------------------------===// 2868 2869/// ActOnStartNamespaceDef - This is called at the start of a namespace 2870/// definition. 2871Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2872 SourceLocation IdentLoc, 2873 IdentifierInfo *II, 2874 SourceLocation LBrace, 2875 AttributeList *AttrList) { 2876 NamespaceDecl *Namespc = 2877 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2878 Namespc->setLBracLoc(LBrace); 2879 2880 Scope *DeclRegionScope = NamespcScope->getParent(); 2881 2882 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 2883 2884 if (II) { 2885 // C++ [namespace.def]p2: 2886 // The identifier in an original-namespace-definition shall not have been 2887 // previously defined in the declarative region in which the 2888 // original-namespace-definition appears. The identifier in an 2889 // original-namespace-definition is the name of the namespace. Subsequently 2890 // in that declarative region, it is treated as an original-namespace-name. 2891 2892 NamedDecl *PrevDecl 2893 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2894 ForRedeclaration); 2895 2896 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2897 // This is an extended namespace definition. 2898 // Attach this namespace decl to the chain of extended namespace 2899 // definitions. 2900 OrigNS->setNextNamespace(Namespc); 2901 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2902 2903 // Remove the previous declaration from the scope. 2904 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2905 IdResolver.RemoveDecl(OrigNS); 2906 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2907 } 2908 } else if (PrevDecl) { 2909 // This is an invalid name redefinition. 2910 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2911 << Namespc->getDeclName(); 2912 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2913 Namespc->setInvalidDecl(); 2914 // Continue on to push Namespc as current DeclContext and return it. 2915 } else if (II->isStr("std") && 2916 CurContext->getLookupContext()->isTranslationUnit()) { 2917 // This is the first "real" definition of the namespace "std", so update 2918 // our cache of the "std" namespace to point at this definition. 2919 if (StdNamespace) { 2920 // We had already defined a dummy namespace "std". Link this new 2921 // namespace definition to the dummy namespace "std". 2922 StdNamespace->setNextNamespace(Namespc); 2923 StdNamespace->setLocation(IdentLoc); 2924 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2925 } 2926 2927 // Make our StdNamespace cache point at the first real definition of the 2928 // "std" namespace. 2929 StdNamespace = Namespc; 2930 } 2931 2932 PushOnScopeChains(Namespc, DeclRegionScope); 2933 } else { 2934 // Anonymous namespaces. 2935 assert(Namespc->isAnonymousNamespace()); 2936 CurContext->addDecl(Namespc); 2937 2938 // Link the anonymous namespace into its parent. 2939 NamespaceDecl *PrevDecl; 2940 DeclContext *Parent = CurContext->getLookupContext(); 2941 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 2942 PrevDecl = TU->getAnonymousNamespace(); 2943 TU->setAnonymousNamespace(Namespc); 2944 } else { 2945 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 2946 PrevDecl = ND->getAnonymousNamespace(); 2947 ND->setAnonymousNamespace(Namespc); 2948 } 2949 2950 // Link the anonymous namespace with its previous declaration. 2951 if (PrevDecl) { 2952 assert(PrevDecl->isAnonymousNamespace()); 2953 assert(!PrevDecl->getNextNamespace()); 2954 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 2955 PrevDecl->setNextNamespace(Namespc); 2956 } 2957 2958 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2959 // behaves as if it were replaced by 2960 // namespace unique { /* empty body */ } 2961 // using namespace unique; 2962 // namespace unique { namespace-body } 2963 // where all occurrences of 'unique' in a translation unit are 2964 // replaced by the same identifier and this identifier differs 2965 // from all other identifiers in the entire program. 2966 2967 // We just create the namespace with an empty name and then add an 2968 // implicit using declaration, just like the standard suggests. 2969 // 2970 // CodeGen enforces the "universally unique" aspect by giving all 2971 // declarations semantically contained within an anonymous 2972 // namespace internal linkage. 2973 2974 if (!PrevDecl) { 2975 UsingDirectiveDecl* UD 2976 = UsingDirectiveDecl::Create(Context, CurContext, 2977 /* 'using' */ LBrace, 2978 /* 'namespace' */ SourceLocation(), 2979 /* qualifier */ SourceRange(), 2980 /* NNS */ NULL, 2981 /* identifier */ SourceLocation(), 2982 Namespc, 2983 /* Ancestor */ CurContext); 2984 UD->setImplicit(); 2985 CurContext->addDecl(UD); 2986 } 2987 } 2988 2989 // Although we could have an invalid decl (i.e. the namespace name is a 2990 // redefinition), push it as current DeclContext and try to continue parsing. 2991 // FIXME: We should be able to push Namespc here, so that the each DeclContext 2992 // for the namespace has the declarations that showed up in that particular 2993 // namespace definition. 2994 PushDeclContext(NamespcScope, Namespc); 2995 return DeclPtrTy::make(Namespc); 2996} 2997 2998/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2999/// is a namespace alias, returns the namespace it points to. 3000static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3001 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3002 return AD->getNamespace(); 3003 return dyn_cast_or_null<NamespaceDecl>(D); 3004} 3005 3006/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3007/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3008void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3009 Decl *Dcl = D.getAs<Decl>(); 3010 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3011 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3012 Namespc->setRBracLoc(RBrace); 3013 PopDeclContext(); 3014} 3015 3016Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3017 SourceLocation UsingLoc, 3018 SourceLocation NamespcLoc, 3019 const CXXScopeSpec &SS, 3020 SourceLocation IdentLoc, 3021 IdentifierInfo *NamespcName, 3022 AttributeList *AttrList) { 3023 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3024 assert(NamespcName && "Invalid NamespcName."); 3025 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3026 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3027 3028 UsingDirectiveDecl *UDir = 0; 3029 3030 // Lookup namespace name. 3031 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3032 LookupParsedName(R, S, &SS); 3033 if (R.isAmbiguous()) 3034 return DeclPtrTy(); 3035 3036 if (!R.empty()) { 3037 NamedDecl *Named = R.getFoundDecl(); 3038 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3039 && "expected namespace decl"); 3040 // C++ [namespace.udir]p1: 3041 // A using-directive specifies that the names in the nominated 3042 // namespace can be used in the scope in which the 3043 // using-directive appears after the using-directive. During 3044 // unqualified name lookup (3.4.1), the names appear as if they 3045 // were declared in the nearest enclosing namespace which 3046 // contains both the using-directive and the nominated 3047 // namespace. [Note: in this context, "contains" means "contains 3048 // directly or indirectly". ] 3049 3050 // Find enclosing context containing both using-directive and 3051 // nominated namespace. 3052 NamespaceDecl *NS = getNamespaceDecl(Named); 3053 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3054 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3055 CommonAncestor = CommonAncestor->getParent(); 3056 3057 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3058 SS.getRange(), 3059 (NestedNameSpecifier *)SS.getScopeRep(), 3060 IdentLoc, Named, CommonAncestor); 3061 PushUsingDirective(S, UDir); 3062 } else { 3063 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3064 } 3065 3066 // FIXME: We ignore attributes for now. 3067 delete AttrList; 3068 return DeclPtrTy::make(UDir); 3069} 3070 3071void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3072 // If scope has associated entity, then using directive is at namespace 3073 // or translation unit scope. We add UsingDirectiveDecls, into 3074 // it's lookup structure. 3075 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3076 Ctx->addDecl(UDir); 3077 else 3078 // Otherwise it is block-sope. using-directives will affect lookup 3079 // only to the end of scope. 3080 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3081} 3082 3083 3084Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3085 AccessSpecifier AS, 3086 bool HasUsingKeyword, 3087 SourceLocation UsingLoc, 3088 const CXXScopeSpec &SS, 3089 UnqualifiedId &Name, 3090 AttributeList *AttrList, 3091 bool IsTypeName, 3092 SourceLocation TypenameLoc) { 3093 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3094 3095 switch (Name.getKind()) { 3096 case UnqualifiedId::IK_Identifier: 3097 case UnqualifiedId::IK_OperatorFunctionId: 3098 case UnqualifiedId::IK_LiteralOperatorId: 3099 case UnqualifiedId::IK_ConversionFunctionId: 3100 break; 3101 3102 case UnqualifiedId::IK_ConstructorName: 3103 case UnqualifiedId::IK_ConstructorTemplateId: 3104 // C++0x inherited constructors. 3105 if (getLangOptions().CPlusPlus0x) break; 3106 3107 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3108 << SS.getRange(); 3109 return DeclPtrTy(); 3110 3111 case UnqualifiedId::IK_DestructorName: 3112 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3113 << SS.getRange(); 3114 return DeclPtrTy(); 3115 3116 case UnqualifiedId::IK_TemplateId: 3117 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3118 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3119 return DeclPtrTy(); 3120 } 3121 3122 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3123 if (!TargetName) 3124 return DeclPtrTy(); 3125 3126 // Warn about using declarations. 3127 // TODO: store that the declaration was written without 'using' and 3128 // talk about access decls instead of using decls in the 3129 // diagnostics. 3130 if (!HasUsingKeyword) { 3131 UsingLoc = Name.getSourceRange().getBegin(); 3132 3133 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3134 << CodeModificationHint::CreateInsertion(SS.getRange().getBegin(), 3135 "using "); 3136 } 3137 3138 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3139 Name.getSourceRange().getBegin(), 3140 TargetName, AttrList, 3141 /* IsInstantiation */ false, 3142 IsTypeName, TypenameLoc); 3143 if (UD) 3144 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3145 3146 return DeclPtrTy::make(UD); 3147} 3148 3149/// Determines whether to create a using shadow decl for a particular 3150/// decl, given the set of decls existing prior to this using lookup. 3151bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3152 const LookupResult &Previous) { 3153 // Diagnose finding a decl which is not from a base class of the 3154 // current class. We do this now because there are cases where this 3155 // function will silently decide not to build a shadow decl, which 3156 // will pre-empt further diagnostics. 3157 // 3158 // We don't need to do this in C++0x because we do the check once on 3159 // the qualifier. 3160 // 3161 // FIXME: diagnose the following if we care enough: 3162 // struct A { int foo; }; 3163 // struct B : A { using A::foo; }; 3164 // template <class T> struct C : A {}; 3165 // template <class T> struct D : C<T> { using B::foo; } // <--- 3166 // This is invalid (during instantiation) in C++03 because B::foo 3167 // resolves to the using decl in B, which is not a base class of D<T>. 3168 // We can't diagnose it immediately because C<T> is an unknown 3169 // specialization. The UsingShadowDecl in D<T> then points directly 3170 // to A::foo, which will look well-formed when we instantiate. 3171 // The right solution is to not collapse the shadow-decl chain. 3172 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3173 DeclContext *OrigDC = Orig->getDeclContext(); 3174 3175 // Handle enums and anonymous structs. 3176 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3177 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3178 while (OrigRec->isAnonymousStructOrUnion()) 3179 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3180 3181 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3182 if (OrigDC == CurContext) { 3183 Diag(Using->getLocation(), 3184 diag::err_using_decl_nested_name_specifier_is_current_class) 3185 << Using->getNestedNameRange(); 3186 Diag(Orig->getLocation(), diag::note_using_decl_target); 3187 return true; 3188 } 3189 3190 Diag(Using->getNestedNameRange().getBegin(), 3191 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3192 << Using->getTargetNestedNameDecl() 3193 << cast<CXXRecordDecl>(CurContext) 3194 << Using->getNestedNameRange(); 3195 Diag(Orig->getLocation(), diag::note_using_decl_target); 3196 return true; 3197 } 3198 } 3199 3200 if (Previous.empty()) return false; 3201 3202 NamedDecl *Target = Orig; 3203 if (isa<UsingShadowDecl>(Target)) 3204 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3205 3206 // If the target happens to be one of the previous declarations, we 3207 // don't have a conflict. 3208 // 3209 // FIXME: but we might be increasing its access, in which case we 3210 // should redeclare it. 3211 NamedDecl *NonTag = 0, *Tag = 0; 3212 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3213 I != E; ++I) { 3214 NamedDecl *D = (*I)->getUnderlyingDecl(); 3215 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3216 return false; 3217 3218 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3219 } 3220 3221 if (Target->isFunctionOrFunctionTemplate()) { 3222 FunctionDecl *FD; 3223 if (isa<FunctionTemplateDecl>(Target)) 3224 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3225 else 3226 FD = cast<FunctionDecl>(Target); 3227 3228 NamedDecl *OldDecl = 0; 3229 switch (CheckOverload(FD, Previous, OldDecl)) { 3230 case Ovl_Overload: 3231 return false; 3232 3233 case Ovl_NonFunction: 3234 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3235 break; 3236 3237 // We found a decl with the exact signature. 3238 case Ovl_Match: 3239 if (isa<UsingShadowDecl>(OldDecl)) { 3240 // Silently ignore the possible conflict. 3241 return false; 3242 } 3243 3244 // If we're in a record, we want to hide the target, so we 3245 // return true (without a diagnostic) to tell the caller not to 3246 // build a shadow decl. 3247 if (CurContext->isRecord()) 3248 return true; 3249 3250 // If we're not in a record, this is an error. 3251 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3252 break; 3253 } 3254 3255 Diag(Target->getLocation(), diag::note_using_decl_target); 3256 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3257 return true; 3258 } 3259 3260 // Target is not a function. 3261 3262 if (isa<TagDecl>(Target)) { 3263 // No conflict between a tag and a non-tag. 3264 if (!Tag) return false; 3265 3266 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3267 Diag(Target->getLocation(), diag::note_using_decl_target); 3268 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3269 return true; 3270 } 3271 3272 // No conflict between a tag and a non-tag. 3273 if (!NonTag) return false; 3274 3275 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3276 Diag(Target->getLocation(), diag::note_using_decl_target); 3277 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3278 return true; 3279} 3280 3281/// Builds a shadow declaration corresponding to a 'using' declaration. 3282UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3283 UsingDecl *UD, 3284 NamedDecl *Orig) { 3285 3286 // If we resolved to another shadow declaration, just coalesce them. 3287 NamedDecl *Target = Orig; 3288 if (isa<UsingShadowDecl>(Target)) { 3289 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3290 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3291 } 3292 3293 UsingShadowDecl *Shadow 3294 = UsingShadowDecl::Create(Context, CurContext, 3295 UD->getLocation(), UD, Target); 3296 UD->addShadowDecl(Shadow); 3297 3298 if (S) 3299 PushOnScopeChains(Shadow, S); 3300 else 3301 CurContext->addDecl(Shadow); 3302 Shadow->setAccess(UD->getAccess()); 3303 3304 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3305 Shadow->setInvalidDecl(); 3306 3307 return Shadow; 3308} 3309 3310/// Hides a using shadow declaration. This is required by the current 3311/// using-decl implementation when a resolvable using declaration in a 3312/// class is followed by a declaration which would hide or override 3313/// one or more of the using decl's targets; for example: 3314/// 3315/// struct Base { void foo(int); }; 3316/// struct Derived : Base { 3317/// using Base::foo; 3318/// void foo(int); 3319/// }; 3320/// 3321/// The governing language is C++03 [namespace.udecl]p12: 3322/// 3323/// When a using-declaration brings names from a base class into a 3324/// derived class scope, member functions in the derived class 3325/// override and/or hide member functions with the same name and 3326/// parameter types in a base class (rather than conflicting). 3327/// 3328/// There are two ways to implement this: 3329/// (1) optimistically create shadow decls when they're not hidden 3330/// by existing declarations, or 3331/// (2) don't create any shadow decls (or at least don't make them 3332/// visible) until we've fully parsed/instantiated the class. 3333/// The problem with (1) is that we might have to retroactively remove 3334/// a shadow decl, which requires several O(n) operations because the 3335/// decl structures are (very reasonably) not designed for removal. 3336/// (2) avoids this but is very fiddly and phase-dependent. 3337void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3338 // Remove it from the DeclContext... 3339 Shadow->getDeclContext()->removeDecl(Shadow); 3340 3341 // ...and the scope, if applicable... 3342 if (S) { 3343 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3344 IdResolver.RemoveDecl(Shadow); 3345 } 3346 3347 // ...and the using decl. 3348 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3349 3350 // TODO: complain somehow if Shadow was used. It shouldn't 3351 // be possible for this to happen, because 3352} 3353 3354/// Builds a using declaration. 3355/// 3356/// \param IsInstantiation - Whether this call arises from an 3357/// instantiation of an unresolved using declaration. We treat 3358/// the lookup differently for these declarations. 3359NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3360 SourceLocation UsingLoc, 3361 const CXXScopeSpec &SS, 3362 SourceLocation IdentLoc, 3363 DeclarationName Name, 3364 AttributeList *AttrList, 3365 bool IsInstantiation, 3366 bool IsTypeName, 3367 SourceLocation TypenameLoc) { 3368 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3369 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3370 3371 // FIXME: We ignore attributes for now. 3372 delete AttrList; 3373 3374 if (SS.isEmpty()) { 3375 Diag(IdentLoc, diag::err_using_requires_qualname); 3376 return 0; 3377 } 3378 3379 // Do the redeclaration lookup in the current scope. 3380 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3381 ForRedeclaration); 3382 Previous.setHideTags(false); 3383 if (S) { 3384 LookupName(Previous, S); 3385 3386 // It is really dumb that we have to do this. 3387 LookupResult::Filter F = Previous.makeFilter(); 3388 while (F.hasNext()) { 3389 NamedDecl *D = F.next(); 3390 if (!isDeclInScope(D, CurContext, S)) 3391 F.erase(); 3392 } 3393 F.done(); 3394 } else { 3395 assert(IsInstantiation && "no scope in non-instantiation"); 3396 assert(CurContext->isRecord() && "scope not record in instantiation"); 3397 LookupQualifiedName(Previous, CurContext); 3398 } 3399 3400 NestedNameSpecifier *NNS = 3401 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3402 3403 // Check for invalid redeclarations. 3404 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3405 return 0; 3406 3407 // Check for bad qualifiers. 3408 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3409 return 0; 3410 3411 DeclContext *LookupContext = computeDeclContext(SS); 3412 NamedDecl *D; 3413 if (!LookupContext) { 3414 if (IsTypeName) { 3415 // FIXME: not all declaration name kinds are legal here 3416 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3417 UsingLoc, TypenameLoc, 3418 SS.getRange(), NNS, 3419 IdentLoc, Name); 3420 } else { 3421 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3422 UsingLoc, SS.getRange(), NNS, 3423 IdentLoc, Name); 3424 } 3425 } else { 3426 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3427 SS.getRange(), UsingLoc, NNS, Name, 3428 IsTypeName); 3429 } 3430 D->setAccess(AS); 3431 CurContext->addDecl(D); 3432 3433 if (!LookupContext) return D; 3434 UsingDecl *UD = cast<UsingDecl>(D); 3435 3436 if (RequireCompleteDeclContext(SS)) { 3437 UD->setInvalidDecl(); 3438 return UD; 3439 } 3440 3441 // Look up the target name. 3442 3443 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3444 3445 // Unlike most lookups, we don't always want to hide tag 3446 // declarations: tag names are visible through the using declaration 3447 // even if hidden by ordinary names, *except* in a dependent context 3448 // where it's important for the sanity of two-phase lookup. 3449 if (!IsInstantiation) 3450 R.setHideTags(false); 3451 3452 LookupQualifiedName(R, LookupContext); 3453 3454 if (R.empty()) { 3455 Diag(IdentLoc, diag::err_no_member) 3456 << Name << LookupContext << SS.getRange(); 3457 UD->setInvalidDecl(); 3458 return UD; 3459 } 3460 3461 if (R.isAmbiguous()) { 3462 UD->setInvalidDecl(); 3463 return UD; 3464 } 3465 3466 if (IsTypeName) { 3467 // If we asked for a typename and got a non-type decl, error out. 3468 if (!R.getAsSingle<TypeDecl>()) { 3469 Diag(IdentLoc, diag::err_using_typename_non_type); 3470 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3471 Diag((*I)->getUnderlyingDecl()->getLocation(), 3472 diag::note_using_decl_target); 3473 UD->setInvalidDecl(); 3474 return UD; 3475 } 3476 } else { 3477 // If we asked for a non-typename and we got a type, error out, 3478 // but only if this is an instantiation of an unresolved using 3479 // decl. Otherwise just silently find the type name. 3480 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3481 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3482 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3483 UD->setInvalidDecl(); 3484 return UD; 3485 } 3486 } 3487 3488 // C++0x N2914 [namespace.udecl]p6: 3489 // A using-declaration shall not name a namespace. 3490 if (R.getAsSingle<NamespaceDecl>()) { 3491 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3492 << SS.getRange(); 3493 UD->setInvalidDecl(); 3494 return UD; 3495 } 3496 3497 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3498 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3499 BuildUsingShadowDecl(S, UD, *I); 3500 } 3501 3502 return UD; 3503} 3504 3505/// Checks that the given using declaration is not an invalid 3506/// redeclaration. Note that this is checking only for the using decl 3507/// itself, not for any ill-formedness among the UsingShadowDecls. 3508bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3509 bool isTypeName, 3510 const CXXScopeSpec &SS, 3511 SourceLocation NameLoc, 3512 const LookupResult &Prev) { 3513 // C++03 [namespace.udecl]p8: 3514 // C++0x [namespace.udecl]p10: 3515 // A using-declaration is a declaration and can therefore be used 3516 // repeatedly where (and only where) multiple declarations are 3517 // allowed. 3518 // That's only in file contexts. 3519 if (CurContext->getLookupContext()->isFileContext()) 3520 return false; 3521 3522 NestedNameSpecifier *Qual 3523 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3524 3525 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3526 NamedDecl *D = *I; 3527 3528 bool DTypename; 3529 NestedNameSpecifier *DQual; 3530 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3531 DTypename = UD->isTypeName(); 3532 DQual = UD->getTargetNestedNameDecl(); 3533 } else if (UnresolvedUsingValueDecl *UD 3534 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3535 DTypename = false; 3536 DQual = UD->getTargetNestedNameSpecifier(); 3537 } else if (UnresolvedUsingTypenameDecl *UD 3538 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3539 DTypename = true; 3540 DQual = UD->getTargetNestedNameSpecifier(); 3541 } else continue; 3542 3543 // using decls differ if one says 'typename' and the other doesn't. 3544 // FIXME: non-dependent using decls? 3545 if (isTypeName != DTypename) continue; 3546 3547 // using decls differ if they name different scopes (but note that 3548 // template instantiation can cause this check to trigger when it 3549 // didn't before instantiation). 3550 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3551 Context.getCanonicalNestedNameSpecifier(DQual)) 3552 continue; 3553 3554 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3555 Diag(D->getLocation(), diag::note_using_decl) << 1; 3556 return true; 3557 } 3558 3559 return false; 3560} 3561 3562 3563/// Checks that the given nested-name qualifier used in a using decl 3564/// in the current context is appropriately related to the current 3565/// scope. If an error is found, diagnoses it and returns true. 3566bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3567 const CXXScopeSpec &SS, 3568 SourceLocation NameLoc) { 3569 DeclContext *NamedContext = computeDeclContext(SS); 3570 3571 if (!CurContext->isRecord()) { 3572 // C++03 [namespace.udecl]p3: 3573 // C++0x [namespace.udecl]p8: 3574 // A using-declaration for a class member shall be a member-declaration. 3575 3576 // If we weren't able to compute a valid scope, it must be a 3577 // dependent class scope. 3578 if (!NamedContext || NamedContext->isRecord()) { 3579 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3580 << SS.getRange(); 3581 return true; 3582 } 3583 3584 // Otherwise, everything is known to be fine. 3585 return false; 3586 } 3587 3588 // The current scope is a record. 3589 3590 // If the named context is dependent, we can't decide much. 3591 if (!NamedContext) { 3592 // FIXME: in C++0x, we can diagnose if we can prove that the 3593 // nested-name-specifier does not refer to a base class, which is 3594 // still possible in some cases. 3595 3596 // Otherwise we have to conservatively report that things might be 3597 // okay. 3598 return false; 3599 } 3600 3601 if (!NamedContext->isRecord()) { 3602 // Ideally this would point at the last name in the specifier, 3603 // but we don't have that level of source info. 3604 Diag(SS.getRange().getBegin(), 3605 diag::err_using_decl_nested_name_specifier_is_not_class) 3606 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3607 return true; 3608 } 3609 3610 if (getLangOptions().CPlusPlus0x) { 3611 // C++0x [namespace.udecl]p3: 3612 // In a using-declaration used as a member-declaration, the 3613 // nested-name-specifier shall name a base class of the class 3614 // being defined. 3615 3616 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3617 cast<CXXRecordDecl>(NamedContext))) { 3618 if (CurContext == NamedContext) { 3619 Diag(NameLoc, 3620 diag::err_using_decl_nested_name_specifier_is_current_class) 3621 << SS.getRange(); 3622 return true; 3623 } 3624 3625 Diag(SS.getRange().getBegin(), 3626 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3627 << (NestedNameSpecifier*) SS.getScopeRep() 3628 << cast<CXXRecordDecl>(CurContext) 3629 << SS.getRange(); 3630 return true; 3631 } 3632 3633 return false; 3634 } 3635 3636 // C++03 [namespace.udecl]p4: 3637 // A using-declaration used as a member-declaration shall refer 3638 // to a member of a base class of the class being defined [etc.]. 3639 3640 // Salient point: SS doesn't have to name a base class as long as 3641 // lookup only finds members from base classes. Therefore we can 3642 // diagnose here only if we can prove that that can't happen, 3643 // i.e. if the class hierarchies provably don't intersect. 3644 3645 // TODO: it would be nice if "definitely valid" results were cached 3646 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3647 // need to be repeated. 3648 3649 struct UserData { 3650 llvm::DenseSet<const CXXRecordDecl*> Bases; 3651 3652 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3653 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3654 Data->Bases.insert(Base); 3655 return true; 3656 } 3657 3658 bool hasDependentBases(const CXXRecordDecl *Class) { 3659 return !Class->forallBases(collect, this); 3660 } 3661 3662 /// Returns true if the base is dependent or is one of the 3663 /// accumulated base classes. 3664 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3665 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3666 return !Data->Bases.count(Base); 3667 } 3668 3669 bool mightShareBases(const CXXRecordDecl *Class) { 3670 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3671 } 3672 }; 3673 3674 UserData Data; 3675 3676 // Returns false if we find a dependent base. 3677 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3678 return false; 3679 3680 // Returns false if the class has a dependent base or if it or one 3681 // of its bases is present in the base set of the current context. 3682 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3683 return false; 3684 3685 Diag(SS.getRange().getBegin(), 3686 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3687 << (NestedNameSpecifier*) SS.getScopeRep() 3688 << cast<CXXRecordDecl>(CurContext) 3689 << SS.getRange(); 3690 3691 return true; 3692} 3693 3694Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3695 SourceLocation NamespaceLoc, 3696 SourceLocation AliasLoc, 3697 IdentifierInfo *Alias, 3698 const CXXScopeSpec &SS, 3699 SourceLocation IdentLoc, 3700 IdentifierInfo *Ident) { 3701 3702 // Lookup the namespace name. 3703 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3704 LookupParsedName(R, S, &SS); 3705 3706 // Check if we have a previous declaration with the same name. 3707 if (NamedDecl *PrevDecl 3708 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3709 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3710 // We already have an alias with the same name that points to the same 3711 // namespace, so don't create a new one. 3712 if (!R.isAmbiguous() && !R.empty() && 3713 AD->getNamespace() == getNamespaceDecl(R.getFoundDecl())) 3714 return DeclPtrTy(); 3715 } 3716 3717 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3718 diag::err_redefinition_different_kind; 3719 Diag(AliasLoc, DiagID) << Alias; 3720 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3721 return DeclPtrTy(); 3722 } 3723 3724 if (R.isAmbiguous()) 3725 return DeclPtrTy(); 3726 3727 if (R.empty()) { 3728 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3729 return DeclPtrTy(); 3730 } 3731 3732 NamespaceAliasDecl *AliasDecl = 3733 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3734 Alias, SS.getRange(), 3735 (NestedNameSpecifier *)SS.getScopeRep(), 3736 IdentLoc, R.getFoundDecl()); 3737 3738 PushOnScopeChains(AliasDecl, S); 3739 return DeclPtrTy::make(AliasDecl); 3740} 3741 3742void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3743 CXXConstructorDecl *Constructor) { 3744 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3745 !Constructor->isUsed()) && 3746 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3747 3748 CXXRecordDecl *ClassDecl 3749 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3750 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3751 3752 DeclContext *PreviousContext = CurContext; 3753 CurContext = Constructor; 3754 if (SetBaseOrMemberInitializers(Constructor, 0, 0, true, false)) { 3755 Diag(CurrentLocation, diag::note_member_synthesized_at) 3756 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 3757 Constructor->setInvalidDecl(); 3758 } else { 3759 Constructor->setUsed(); 3760 } 3761 CurContext = PreviousContext; 3762} 3763 3764void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3765 CXXDestructorDecl *Destructor) { 3766 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3767 "DefineImplicitDestructor - call it for implicit default dtor"); 3768 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3769 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3770 3771 DeclContext *PreviousContext = CurContext; 3772 CurContext = Destructor; 3773 3774 // C++ [class.dtor] p5 3775 // Before the implicitly-declared default destructor for a class is 3776 // implicitly defined, all the implicitly-declared default destructors 3777 // for its base class and its non-static data members shall have been 3778 // implicitly defined. 3779 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3780 E = ClassDecl->bases_end(); Base != E; ++Base) { 3781 CXXRecordDecl *BaseClassDecl 3782 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3783 if (!BaseClassDecl->hasTrivialDestructor()) { 3784 if (CXXDestructorDecl *BaseDtor = 3785 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 3786 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 3787 else 3788 assert(false && 3789 "DefineImplicitDestructor - missing dtor in a base class"); 3790 } 3791 } 3792 3793 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3794 E = ClassDecl->field_end(); Field != E; ++Field) { 3795 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3796 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3797 FieldType = Array->getElementType(); 3798 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3799 CXXRecordDecl *FieldClassDecl 3800 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3801 if (!FieldClassDecl->hasTrivialDestructor()) { 3802 if (CXXDestructorDecl *FieldDtor = 3803 const_cast<CXXDestructorDecl*>( 3804 FieldClassDecl->getDestructor(Context))) 3805 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 3806 else 3807 assert(false && 3808 "DefineImplicitDestructor - missing dtor in class of a data member"); 3809 } 3810 } 3811 } 3812 3813 // FIXME: If CheckDestructor fails, we should emit a note about where the 3814 // implicit destructor was needed. 3815 if (CheckDestructor(Destructor)) { 3816 Diag(CurrentLocation, diag::note_member_synthesized_at) 3817 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3818 3819 Destructor->setInvalidDecl(); 3820 CurContext = PreviousContext; 3821 3822 return; 3823 } 3824 CurContext = PreviousContext; 3825 3826 Destructor->setUsed(); 3827} 3828 3829void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3830 CXXMethodDecl *MethodDecl) { 3831 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3832 MethodDecl->getOverloadedOperator() == OO_Equal && 3833 !MethodDecl->isUsed()) && 3834 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3835 3836 CXXRecordDecl *ClassDecl 3837 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3838 3839 DeclContext *PreviousContext = CurContext; 3840 CurContext = MethodDecl; 3841 3842 // C++[class.copy] p12 3843 // Before the implicitly-declared copy assignment operator for a class is 3844 // implicitly defined, all implicitly-declared copy assignment operators 3845 // for its direct base classes and its nonstatic data members shall have 3846 // been implicitly defined. 3847 bool err = false; 3848 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3849 E = ClassDecl->bases_end(); Base != E; ++Base) { 3850 CXXRecordDecl *BaseClassDecl 3851 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3852 if (CXXMethodDecl *BaseAssignOpMethod = 3853 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3854 BaseClassDecl)) 3855 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3856 } 3857 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3858 E = ClassDecl->field_end(); Field != E; ++Field) { 3859 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3860 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3861 FieldType = Array->getElementType(); 3862 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3863 CXXRecordDecl *FieldClassDecl 3864 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3865 if (CXXMethodDecl *FieldAssignOpMethod = 3866 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3867 FieldClassDecl)) 3868 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3869 } else if (FieldType->isReferenceType()) { 3870 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3871 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3872 Diag(Field->getLocation(), diag::note_declared_at); 3873 Diag(CurrentLocation, diag::note_first_required_here); 3874 err = true; 3875 } else if (FieldType.isConstQualified()) { 3876 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3877 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3878 Diag(Field->getLocation(), diag::note_declared_at); 3879 Diag(CurrentLocation, diag::note_first_required_here); 3880 err = true; 3881 } 3882 } 3883 if (!err) 3884 MethodDecl->setUsed(); 3885 3886 CurContext = PreviousContext; 3887} 3888 3889CXXMethodDecl * 3890Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 3891 ParmVarDecl *ParmDecl, 3892 CXXRecordDecl *ClassDecl) { 3893 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3894 QualType RHSType(LHSType); 3895 // If class's assignment operator argument is const/volatile qualified, 3896 // look for operator = (const/volatile B&). Otherwise, look for 3897 // operator = (B&). 3898 RHSType = Context.getCVRQualifiedType(RHSType, 3899 ParmDecl->getType().getCVRQualifiers()); 3900 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3901 LHSType, 3902 SourceLocation())); 3903 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3904 RHSType, 3905 CurrentLocation)); 3906 Expr *Args[2] = { &*LHS, &*RHS }; 3907 OverloadCandidateSet CandidateSet(CurrentLocation); 3908 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3909 CandidateSet); 3910 OverloadCandidateSet::iterator Best; 3911 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 3912 return cast<CXXMethodDecl>(Best->Function); 3913 assert(false && 3914 "getAssignOperatorMethod - copy assignment operator method not found"); 3915 return 0; 3916} 3917 3918void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3919 CXXConstructorDecl *CopyConstructor, 3920 unsigned TypeQuals) { 3921 assert((CopyConstructor->isImplicit() && 3922 CopyConstructor->isCopyConstructor(TypeQuals) && 3923 !CopyConstructor->isUsed()) && 3924 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3925 3926 CXXRecordDecl *ClassDecl 3927 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3928 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3929 3930 DeclContext *PreviousContext = CurContext; 3931 CurContext = CopyConstructor; 3932 3933 // C++ [class.copy] p209 3934 // Before the implicitly-declared copy constructor for a class is 3935 // implicitly defined, all the implicitly-declared copy constructors 3936 // for its base class and its non-static data members shall have been 3937 // implicitly defined. 3938 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3939 Base != ClassDecl->bases_end(); ++Base) { 3940 CXXRecordDecl *BaseClassDecl 3941 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3942 if (CXXConstructorDecl *BaseCopyCtor = 3943 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 3944 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3945 } 3946 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3947 FieldEnd = ClassDecl->field_end(); 3948 Field != FieldEnd; ++Field) { 3949 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3950 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3951 FieldType = Array->getElementType(); 3952 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3953 CXXRecordDecl *FieldClassDecl 3954 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3955 if (CXXConstructorDecl *FieldCopyCtor = 3956 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 3957 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3958 } 3959 } 3960 CopyConstructor->setUsed(); 3961 3962 CurContext = PreviousContext; 3963} 3964 3965Sema::OwningExprResult 3966Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3967 CXXConstructorDecl *Constructor, 3968 MultiExprArg ExprArgs, 3969 bool RequiresZeroInit, 3970 bool BaseInitialization) { 3971 bool Elidable = false; 3972 3973 // C++ [class.copy]p15: 3974 // Whenever a temporary class object is copied using a copy constructor, and 3975 // this object and the copy have the same cv-unqualified type, an 3976 // implementation is permitted to treat the original and the copy as two 3977 // different ways of referring to the same object and not perform a copy at 3978 // all, even if the class copy constructor or destructor have side effects. 3979 3980 // FIXME: Is this enough? 3981 if (Constructor->isCopyConstructor()) { 3982 Expr *E = ((Expr **)ExprArgs.get())[0]; 3983 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3984 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3985 E = ICE->getSubExpr(); 3986 if (CXXFunctionalCastExpr *FCE = dyn_cast<CXXFunctionalCastExpr>(E)) 3987 E = FCE->getSubExpr(); 3988 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 3989 E = BE->getSubExpr(); 3990 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3991 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3992 E = ICE->getSubExpr(); 3993 3994 if (CallExpr *CE = dyn_cast<CallExpr>(E)) 3995 Elidable = !CE->getCallReturnType()->isReferenceType(); 3996 else if (isa<CXXTemporaryObjectExpr>(E)) 3997 Elidable = true; 3998 else if (isa<CXXConstructExpr>(E)) 3999 Elidable = true; 4000 } 4001 4002 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4003 Elidable, move(ExprArgs), RequiresZeroInit, 4004 BaseInitialization); 4005} 4006 4007/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4008/// including handling of its default argument expressions. 4009Sema::OwningExprResult 4010Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4011 CXXConstructorDecl *Constructor, bool Elidable, 4012 MultiExprArg ExprArgs, 4013 bool RequiresZeroInit, 4014 bool BaseInitialization) { 4015 unsigned NumExprs = ExprArgs.size(); 4016 Expr **Exprs = (Expr **)ExprArgs.release(); 4017 4018 MarkDeclarationReferenced(ConstructLoc, Constructor); 4019 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4020 Constructor, Elidable, Exprs, NumExprs, 4021 RequiresZeroInit, BaseInitialization)); 4022} 4023 4024bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4025 CXXConstructorDecl *Constructor, 4026 MultiExprArg Exprs) { 4027 OwningExprResult TempResult = 4028 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4029 move(Exprs)); 4030 if (TempResult.isInvalid()) 4031 return true; 4032 4033 Expr *Temp = TempResult.takeAs<Expr>(); 4034 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4035 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4036 VD->setInit(Temp); 4037 4038 return false; 4039} 4040 4041void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4042 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4043 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4044 !ClassDecl->hasTrivialDestructor()) { 4045 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4046 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4047 CheckDestructorAccess(VD->getLocation(), Record); 4048 } 4049} 4050 4051/// AddCXXDirectInitializerToDecl - This action is called immediately after 4052/// ActOnDeclarator, when a C++ direct initializer is present. 4053/// e.g: "int x(1);" 4054void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4055 SourceLocation LParenLoc, 4056 MultiExprArg Exprs, 4057 SourceLocation *CommaLocs, 4058 SourceLocation RParenLoc) { 4059 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4060 Decl *RealDecl = Dcl.getAs<Decl>(); 4061 4062 // If there is no declaration, there was an error parsing it. Just ignore 4063 // the initializer. 4064 if (RealDecl == 0) 4065 return; 4066 4067 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4068 if (!VDecl) { 4069 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4070 RealDecl->setInvalidDecl(); 4071 return; 4072 } 4073 4074 // We will represent direct-initialization similarly to copy-initialization: 4075 // int x(1); -as-> int x = 1; 4076 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4077 // 4078 // Clients that want to distinguish between the two forms, can check for 4079 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4080 // A major benefit is that clients that don't particularly care about which 4081 // exactly form was it (like the CodeGen) can handle both cases without 4082 // special case code. 4083 4084 // C++ 8.5p11: 4085 // The form of initialization (using parentheses or '=') is generally 4086 // insignificant, but does matter when the entity being initialized has a 4087 // class type. 4088 QualType DeclInitType = VDecl->getType(); 4089 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4090 DeclInitType = Context.getBaseElementType(Array); 4091 4092 if (!VDecl->getType()->isDependentType() && 4093 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4094 diag::err_typecheck_decl_incomplete_type)) { 4095 VDecl->setInvalidDecl(); 4096 return; 4097 } 4098 4099 // The variable can not have an abstract class type. 4100 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4101 diag::err_abstract_type_in_decl, 4102 AbstractVariableType)) 4103 VDecl->setInvalidDecl(); 4104 4105 const VarDecl *Def; 4106 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4107 Diag(VDecl->getLocation(), diag::err_redefinition) 4108 << VDecl->getDeclName(); 4109 Diag(Def->getLocation(), diag::note_previous_definition); 4110 VDecl->setInvalidDecl(); 4111 return; 4112 } 4113 4114 // If either the declaration has a dependent type or if any of the 4115 // expressions is type-dependent, we represent the initialization 4116 // via a ParenListExpr for later use during template instantiation. 4117 if (VDecl->getType()->isDependentType() || 4118 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4119 // Let clients know that initialization was done with a direct initializer. 4120 VDecl->setCXXDirectInitializer(true); 4121 4122 // Store the initialization expressions as a ParenListExpr. 4123 unsigned NumExprs = Exprs.size(); 4124 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4125 (Expr **)Exprs.release(), 4126 NumExprs, RParenLoc)); 4127 return; 4128 } 4129 4130 // Capture the variable that is being initialized and the style of 4131 // initialization. 4132 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4133 4134 // FIXME: Poor source location information. 4135 InitializationKind Kind 4136 = InitializationKind::CreateDirect(VDecl->getLocation(), 4137 LParenLoc, RParenLoc); 4138 4139 InitializationSequence InitSeq(*this, Entity, Kind, 4140 (Expr**)Exprs.get(), Exprs.size()); 4141 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4142 if (Result.isInvalid()) { 4143 VDecl->setInvalidDecl(); 4144 return; 4145 } 4146 4147 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4148 VDecl->setInit(Result.takeAs<Expr>()); 4149 VDecl->setCXXDirectInitializer(true); 4150 4151 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4152 FinalizeVarWithDestructor(VDecl, Record); 4153} 4154 4155/// \brief Add the applicable constructor candidates for an initialization 4156/// by constructor. 4157static void AddConstructorInitializationCandidates(Sema &SemaRef, 4158 QualType ClassType, 4159 Expr **Args, 4160 unsigned NumArgs, 4161 InitializationKind Kind, 4162 OverloadCandidateSet &CandidateSet) { 4163 // C++ [dcl.init]p14: 4164 // If the initialization is direct-initialization, or if it is 4165 // copy-initialization where the cv-unqualified version of the 4166 // source type is the same class as, or a derived class of, the 4167 // class of the destination, constructors are considered. The 4168 // applicable constructors are enumerated (13.3.1.3), and the 4169 // best one is chosen through overload resolution (13.3). The 4170 // constructor so selected is called to initialize the object, 4171 // with the initializer expression(s) as its argument(s). If no 4172 // constructor applies, or the overload resolution is ambiguous, 4173 // the initialization is ill-formed. 4174 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 4175 assert(ClassRec && "Can only initialize a class type here"); 4176 4177 // FIXME: When we decide not to synthesize the implicitly-declared 4178 // constructors, we'll need to make them appear here. 4179 4180 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 4181 DeclarationName ConstructorName 4182 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 4183 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 4184 DeclContext::lookup_const_iterator Con, ConEnd; 4185 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 4186 Con != ConEnd; ++Con) { 4187 // Find the constructor (which may be a template). 4188 CXXConstructorDecl *Constructor = 0; 4189 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 4190 if (ConstructorTmpl) 4191 Constructor 4192 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 4193 else 4194 Constructor = cast<CXXConstructorDecl>(*Con); 4195 4196 if ((Kind.getKind() == InitializationKind::IK_Direct) || 4197 (Kind.getKind() == InitializationKind::IK_Value) || 4198 (Kind.getKind() == InitializationKind::IK_Copy && 4199 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 4200 ((Kind.getKind() == InitializationKind::IK_Default) && 4201 Constructor->isDefaultConstructor())) { 4202 if (ConstructorTmpl) 4203 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, 4204 ConstructorTmpl->getAccess(), 4205 /*ExplicitArgs*/ 0, 4206 Args, NumArgs, CandidateSet); 4207 else 4208 SemaRef.AddOverloadCandidate(Constructor, Constructor->getAccess(), 4209 Args, NumArgs, CandidateSet); 4210 } 4211 } 4212} 4213 4214/// \brief Attempt to perform initialization by constructor 4215/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 4216/// copy-initialization. 4217/// 4218/// This routine determines whether initialization by constructor is possible, 4219/// but it does not emit any diagnostics in the case where the initialization 4220/// is ill-formed. 4221/// 4222/// \param ClassType the type of the object being initialized, which must have 4223/// class type. 4224/// 4225/// \param Args the arguments provided to initialize the object 4226/// 4227/// \param NumArgs the number of arguments provided to initialize the object 4228/// 4229/// \param Kind the type of initialization being performed 4230/// 4231/// \returns the constructor used to initialize the object, if successful. 4232/// Otherwise, emits a diagnostic and returns NULL. 4233CXXConstructorDecl * 4234Sema::TryInitializationByConstructor(QualType ClassType, 4235 Expr **Args, unsigned NumArgs, 4236 SourceLocation Loc, 4237 InitializationKind Kind) { 4238 // Build the overload candidate set 4239 OverloadCandidateSet CandidateSet(Loc); 4240 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4241 CandidateSet); 4242 4243 // Determine whether we found a constructor we can use. 4244 OverloadCandidateSet::iterator Best; 4245 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4246 case OR_Success: 4247 case OR_Deleted: 4248 // We found a constructor. Return it. 4249 return cast<CXXConstructorDecl>(Best->Function); 4250 4251 case OR_No_Viable_Function: 4252 case OR_Ambiguous: 4253 // Overload resolution failed. Return nothing. 4254 return 0; 4255 } 4256 4257 // Silence GCC warning 4258 return 0; 4259} 4260 4261/// \brief Given a constructor and the set of arguments provided for the 4262/// constructor, convert the arguments and add any required default arguments 4263/// to form a proper call to this constructor. 4264/// 4265/// \returns true if an error occurred, false otherwise. 4266bool 4267Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4268 MultiExprArg ArgsPtr, 4269 SourceLocation Loc, 4270 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4271 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4272 unsigned NumArgs = ArgsPtr.size(); 4273 Expr **Args = (Expr **)ArgsPtr.get(); 4274 4275 const FunctionProtoType *Proto 4276 = Constructor->getType()->getAs<FunctionProtoType>(); 4277 assert(Proto && "Constructor without a prototype?"); 4278 unsigned NumArgsInProto = Proto->getNumArgs(); 4279 4280 // If too few arguments are available, we'll fill in the rest with defaults. 4281 if (NumArgs < NumArgsInProto) 4282 ConvertedArgs.reserve(NumArgsInProto); 4283 else 4284 ConvertedArgs.reserve(NumArgs); 4285 4286 VariadicCallType CallType = 4287 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4288 llvm::SmallVector<Expr *, 8> AllArgs; 4289 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4290 Proto, 0, Args, NumArgs, AllArgs, 4291 CallType); 4292 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4293 ConvertedArgs.push_back(AllArgs[i]); 4294 return Invalid; 4295} 4296 4297/// CompareReferenceRelationship - Compare the two types T1 and T2 to 4298/// determine whether they are reference-related, 4299/// reference-compatible, reference-compatible with added 4300/// qualification, or incompatible, for use in C++ initialization by 4301/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 4302/// type, and the first type (T1) is the pointee type of the reference 4303/// type being initialized. 4304Sema::ReferenceCompareResult 4305Sema::CompareReferenceRelationship(SourceLocation Loc, 4306 QualType OrigT1, QualType OrigT2, 4307 bool& DerivedToBase) { 4308 assert(!OrigT1->isReferenceType() && 4309 "T1 must be the pointee type of the reference type"); 4310 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 4311 4312 QualType T1 = Context.getCanonicalType(OrigT1); 4313 QualType T2 = Context.getCanonicalType(OrigT2); 4314 Qualifiers T1Quals, T2Quals; 4315 QualType UnqualT1 = Context.getUnqualifiedArrayType(T1, T1Quals); 4316 QualType UnqualT2 = Context.getUnqualifiedArrayType(T2, T2Quals); 4317 4318 // C++ [dcl.init.ref]p4: 4319 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 4320 // reference-related to "cv2 T2" if T1 is the same type as T2, or 4321 // T1 is a base class of T2. 4322 if (UnqualT1 == UnqualT2) 4323 DerivedToBase = false; 4324 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 4325 !RequireCompleteType(Loc, OrigT2, PDiag()) && 4326 IsDerivedFrom(UnqualT2, UnqualT1)) 4327 DerivedToBase = true; 4328 else 4329 return Ref_Incompatible; 4330 4331 // At this point, we know that T1 and T2 are reference-related (at 4332 // least). 4333 4334 // If the type is an array type, promote the element qualifiers to the type 4335 // for comparison. 4336 if (isa<ArrayType>(T1) && T1Quals) 4337 T1 = Context.getQualifiedType(UnqualT1, T1Quals); 4338 if (isa<ArrayType>(T2) && T2Quals) 4339 T2 = Context.getQualifiedType(UnqualT2, T2Quals); 4340 4341 // C++ [dcl.init.ref]p4: 4342 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 4343 // reference-related to T2 and cv1 is the same cv-qualification 4344 // as, or greater cv-qualification than, cv2. For purposes of 4345 // overload resolution, cases for which cv1 is greater 4346 // cv-qualification than cv2 are identified as 4347 // reference-compatible with added qualification (see 13.3.3.2). 4348 if (T1Quals.getCVRQualifiers() == T2Quals.getCVRQualifiers()) 4349 return Ref_Compatible; 4350 else if (T1.isMoreQualifiedThan(T2)) 4351 return Ref_Compatible_With_Added_Qualification; 4352 else 4353 return Ref_Related; 4354} 4355 4356/// CheckReferenceInit - Check the initialization of a reference 4357/// variable with the given initializer (C++ [dcl.init.ref]). Init is 4358/// the initializer (either a simple initializer or an initializer 4359/// list), and DeclType is the type of the declaration. When ICS is 4360/// non-null, this routine will compute the implicit conversion 4361/// sequence according to C++ [over.ics.ref] and will not produce any 4362/// diagnostics; when ICS is null, it will emit diagnostics when any 4363/// errors are found. Either way, a return value of true indicates 4364/// that there was a failure, a return value of false indicates that 4365/// the reference initialization succeeded. 4366/// 4367/// When @p SuppressUserConversions, user-defined conversions are 4368/// suppressed. 4369/// When @p AllowExplicit, we also permit explicit user-defined 4370/// conversion functions. 4371/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 4372/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 4373/// This is used when this is called from a C-style cast. 4374bool 4375Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 4376 SourceLocation DeclLoc, 4377 bool SuppressUserConversions, 4378 bool AllowExplicit, bool ForceRValue, 4379 ImplicitConversionSequence *ICS, 4380 bool IgnoreBaseAccess) { 4381 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 4382 4383 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 4384 QualType T2 = Init->getType(); 4385 4386 // If the initializer is the address of an overloaded function, try 4387 // to resolve the overloaded function. If all goes well, T2 is the 4388 // type of the resulting function. 4389 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 4390 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 4391 ICS != 0); 4392 if (Fn) { 4393 // Since we're performing this reference-initialization for 4394 // real, update the initializer with the resulting function. 4395 if (!ICS) { 4396 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 4397 return true; 4398 4399 Init = FixOverloadedFunctionReference(Init, Fn); 4400 } 4401 4402 T2 = Fn->getType(); 4403 } 4404 } 4405 4406 // Compute some basic properties of the types and the initializer. 4407 bool isRValRef = DeclType->isRValueReferenceType(); 4408 bool DerivedToBase = false; 4409 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 4410 Init->isLvalue(Context); 4411 ReferenceCompareResult RefRelationship 4412 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 4413 4414 // Most paths end in a failed conversion. 4415 if (ICS) { 4416 ICS->setBad(BadConversionSequence::no_conversion, Init, DeclType); 4417 } 4418 4419 // C++ [dcl.init.ref]p5: 4420 // A reference to type "cv1 T1" is initialized by an expression 4421 // of type "cv2 T2" as follows: 4422 4423 // -- If the initializer expression 4424 4425 // Rvalue references cannot bind to lvalues (N2812). 4426 // There is absolutely no situation where they can. In particular, note that 4427 // this is ill-formed, even if B has a user-defined conversion to A&&: 4428 // B b; 4429 // A&& r = b; 4430 if (isRValRef && InitLvalue == Expr::LV_Valid) { 4431 if (!ICS) 4432 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4433 << Init->getSourceRange(); 4434 return true; 4435 } 4436 4437 bool BindsDirectly = false; 4438 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 4439 // reference-compatible with "cv2 T2," or 4440 // 4441 // Note that the bit-field check is skipped if we are just computing 4442 // the implicit conversion sequence (C++ [over.best.ics]p2). 4443 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 4444 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4445 BindsDirectly = true; 4446 4447 if (ICS) { 4448 // C++ [over.ics.ref]p1: 4449 // When a parameter of reference type binds directly (8.5.3) 4450 // to an argument expression, the implicit conversion sequence 4451 // is the identity conversion, unless the argument expression 4452 // has a type that is a derived class of the parameter type, 4453 // in which case the implicit conversion sequence is a 4454 // derived-to-base Conversion (13.3.3.1). 4455 ICS->setStandard(); 4456 ICS->Standard.First = ICK_Identity; 4457 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4458 ICS->Standard.Third = ICK_Identity; 4459 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4460 ICS->Standard.setToType(0, T2); 4461 ICS->Standard.setToType(1, T1); 4462 ICS->Standard.setToType(2, T1); 4463 ICS->Standard.ReferenceBinding = true; 4464 ICS->Standard.DirectBinding = true; 4465 ICS->Standard.RRefBinding = false; 4466 ICS->Standard.CopyConstructor = 0; 4467 4468 // Nothing more to do: the inaccessibility/ambiguity check for 4469 // derived-to-base conversions is suppressed when we're 4470 // computing the implicit conversion sequence (C++ 4471 // [over.best.ics]p2). 4472 return false; 4473 } else { 4474 // Perform the conversion. 4475 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4476 if (DerivedToBase) 4477 CK = CastExpr::CK_DerivedToBase; 4478 else if(CheckExceptionSpecCompatibility(Init, T1)) 4479 return true; 4480 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 4481 } 4482 } 4483 4484 // -- has a class type (i.e., T2 is a class type) and can be 4485 // implicitly converted to an lvalue of type "cv3 T3," 4486 // where "cv1 T1" is reference-compatible with "cv3 T3" 4487 // 92) (this conversion is selected by enumerating the 4488 // applicable conversion functions (13.3.1.6) and choosing 4489 // the best one through overload resolution (13.3)), 4490 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 4491 !RequireCompleteType(DeclLoc, T2, 0)) { 4492 CXXRecordDecl *T2RecordDecl 4493 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 4494 4495 OverloadCandidateSet CandidateSet(DeclLoc); 4496 const UnresolvedSetImpl *Conversions 4497 = T2RecordDecl->getVisibleConversionFunctions(); 4498 for (UnresolvedSetImpl::iterator I = Conversions->begin(), 4499 E = Conversions->end(); I != E; ++I) { 4500 NamedDecl *D = *I; 4501 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); 4502 if (isa<UsingShadowDecl>(D)) 4503 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 4504 4505 FunctionTemplateDecl *ConvTemplate 4506 = dyn_cast<FunctionTemplateDecl>(D); 4507 CXXConversionDecl *Conv; 4508 if (ConvTemplate) 4509 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 4510 else 4511 Conv = cast<CXXConversionDecl>(D); 4512 4513 // If the conversion function doesn't return a reference type, 4514 // it can't be considered for this conversion. 4515 if (Conv->getConversionType()->isLValueReferenceType() && 4516 (AllowExplicit || !Conv->isExplicit())) { 4517 if (ConvTemplate) 4518 AddTemplateConversionCandidate(ConvTemplate, I.getAccess(), ActingDC, 4519 Init, DeclType, CandidateSet); 4520 else 4521 AddConversionCandidate(Conv, I.getAccess(), ActingDC, Init, 4522 DeclType, CandidateSet); 4523 } 4524 } 4525 4526 OverloadCandidateSet::iterator Best; 4527 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 4528 case OR_Success: 4529 // This is a direct binding. 4530 BindsDirectly = true; 4531 4532 if (ICS) { 4533 // C++ [over.ics.ref]p1: 4534 // 4535 // [...] If the parameter binds directly to the result of 4536 // applying a conversion function to the argument 4537 // expression, the implicit conversion sequence is a 4538 // user-defined conversion sequence (13.3.3.1.2), with the 4539 // second standard conversion sequence either an identity 4540 // conversion or, if the conversion function returns an 4541 // entity of a type that is a derived class of the parameter 4542 // type, a derived-to-base Conversion. 4543 ICS->setUserDefined(); 4544 ICS->UserDefined.Before = Best->Conversions[0].Standard; 4545 ICS->UserDefined.After = Best->FinalConversion; 4546 ICS->UserDefined.ConversionFunction = Best->Function; 4547 ICS->UserDefined.EllipsisConversion = false; 4548 assert(ICS->UserDefined.After.ReferenceBinding && 4549 ICS->UserDefined.After.DirectBinding && 4550 "Expected a direct reference binding!"); 4551 return false; 4552 } else { 4553 OwningExprResult InitConversion = 4554 BuildCXXCastArgument(DeclLoc, QualType(), 4555 CastExpr::CK_UserDefinedConversion, 4556 cast<CXXMethodDecl>(Best->Function), 4557 Owned(Init)); 4558 Init = InitConversion.takeAs<Expr>(); 4559 4560 if (CheckExceptionSpecCompatibility(Init, T1)) 4561 return true; 4562 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 4563 /*isLvalue=*/true); 4564 } 4565 break; 4566 4567 case OR_Ambiguous: 4568 if (ICS) { 4569 ICS->setAmbiguous(); 4570 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 4571 Cand != CandidateSet.end(); ++Cand) 4572 if (Cand->Viable) 4573 ICS->Ambiguous.addConversion(Cand->Function); 4574 break; 4575 } 4576 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 4577 << Init->getSourceRange(); 4578 PrintOverloadCandidates(CandidateSet, OCD_ViableCandidates, &Init, 1); 4579 return true; 4580 4581 case OR_No_Viable_Function: 4582 case OR_Deleted: 4583 // There was no suitable conversion, or we found a deleted 4584 // conversion; continue with other checks. 4585 break; 4586 } 4587 } 4588 4589 if (BindsDirectly) { 4590 // C++ [dcl.init.ref]p4: 4591 // [...] In all cases where the reference-related or 4592 // reference-compatible relationship of two types is used to 4593 // establish the validity of a reference binding, and T1 is a 4594 // base class of T2, a program that necessitates such a binding 4595 // is ill-formed if T1 is an inaccessible (clause 11) or 4596 // ambiguous (10.2) base class of T2. 4597 // 4598 // Note that we only check this condition when we're allowed to 4599 // complain about errors, because we should not be checking for 4600 // ambiguity (or inaccessibility) unless the reference binding 4601 // actually happens. 4602 if (DerivedToBase) 4603 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 4604 Init->getSourceRange(), 4605 IgnoreBaseAccess); 4606 else 4607 return false; 4608 } 4609 4610 // -- Otherwise, the reference shall be to a non-volatile const 4611 // type (i.e., cv1 shall be const), or the reference shall be an 4612 // rvalue reference and the initializer expression shall be an rvalue. 4613 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4614 if (!ICS) 4615 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4616 << T1.isVolatileQualified() 4617 << T1 << int(InitLvalue != Expr::LV_Valid) 4618 << T2 << Init->getSourceRange(); 4619 return true; 4620 } 4621 4622 // -- If the initializer expression is an rvalue, with T2 a 4623 // class type, and "cv1 T1" is reference-compatible with 4624 // "cv2 T2," the reference is bound in one of the 4625 // following ways (the choice is implementation-defined): 4626 // 4627 // -- The reference is bound to the object represented by 4628 // the rvalue (see 3.10) or to a sub-object within that 4629 // object. 4630 // 4631 // -- A temporary of type "cv1 T2" [sic] is created, and 4632 // a constructor is called to copy the entire rvalue 4633 // object into the temporary. The reference is bound to 4634 // the temporary or to a sub-object within the 4635 // temporary. 4636 // 4637 // The constructor that would be used to make the copy 4638 // shall be callable whether or not the copy is actually 4639 // done. 4640 // 4641 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4642 // freedom, so we will always take the first option and never build 4643 // a temporary in this case. FIXME: We will, however, have to check 4644 // for the presence of a copy constructor in C++98/03 mode. 4645 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4646 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4647 if (ICS) { 4648 ICS->setStandard(); 4649 ICS->Standard.First = ICK_Identity; 4650 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4651 ICS->Standard.Third = ICK_Identity; 4652 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4653 ICS->Standard.setToType(0, T2); 4654 ICS->Standard.setToType(1, T1); 4655 ICS->Standard.setToType(2, T1); 4656 ICS->Standard.ReferenceBinding = true; 4657 ICS->Standard.DirectBinding = false; 4658 ICS->Standard.RRefBinding = isRValRef; 4659 ICS->Standard.CopyConstructor = 0; 4660 } else { 4661 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4662 if (DerivedToBase) 4663 CK = CastExpr::CK_DerivedToBase; 4664 else if(CheckExceptionSpecCompatibility(Init, T1)) 4665 return true; 4666 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4667 } 4668 return false; 4669 } 4670 4671 // -- Otherwise, a temporary of type "cv1 T1" is created and 4672 // initialized from the initializer expression using the 4673 // rules for a non-reference copy initialization (8.5). The 4674 // reference is then bound to the temporary. If T1 is 4675 // reference-related to T2, cv1 must be the same 4676 // cv-qualification as, or greater cv-qualification than, 4677 // cv2; otherwise, the program is ill-formed. 4678 if (RefRelationship == Ref_Related) { 4679 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4680 // we would be reference-compatible or reference-compatible with 4681 // added qualification. But that wasn't the case, so the reference 4682 // initialization fails. 4683 if (!ICS) 4684 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4685 << T1 << int(InitLvalue != Expr::LV_Valid) 4686 << T2 << Init->getSourceRange(); 4687 return true; 4688 } 4689 4690 // If at least one of the types is a class type, the types are not 4691 // related, and we aren't allowed any user conversions, the 4692 // reference binding fails. This case is important for breaking 4693 // recursion, since TryImplicitConversion below will attempt to 4694 // create a temporary through the use of a copy constructor. 4695 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4696 (T1->isRecordType() || T2->isRecordType())) { 4697 if (!ICS) 4698 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4699 << DeclType << Init->getType() << AA_Initializing << Init->getSourceRange(); 4700 return true; 4701 } 4702 4703 // Actually try to convert the initializer to T1. 4704 if (ICS) { 4705 // C++ [over.ics.ref]p2: 4706 // 4707 // When a parameter of reference type is not bound directly to 4708 // an argument expression, the conversion sequence is the one 4709 // required to convert the argument expression to the 4710 // underlying type of the reference according to 4711 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4712 // to copy-initializing a temporary of the underlying type with 4713 // the argument expression. Any difference in top-level 4714 // cv-qualification is subsumed by the initialization itself 4715 // and does not constitute a conversion. 4716 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4717 /*AllowExplicit=*/false, 4718 /*ForceRValue=*/false, 4719 /*InOverloadResolution=*/false); 4720 4721 // Of course, that's still a reference binding. 4722 if (ICS->isStandard()) { 4723 ICS->Standard.ReferenceBinding = true; 4724 ICS->Standard.RRefBinding = isRValRef; 4725 } else if (ICS->isUserDefined()) { 4726 ICS->UserDefined.After.ReferenceBinding = true; 4727 ICS->UserDefined.After.RRefBinding = isRValRef; 4728 } 4729 return ICS->isBad(); 4730 } else { 4731 ImplicitConversionSequence Conversions; 4732 bool badConversion = PerformImplicitConversion(Init, T1, AA_Initializing, 4733 false, false, 4734 Conversions); 4735 if (badConversion) { 4736 if (Conversions.isAmbiguous()) { 4737 Diag(DeclLoc, 4738 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4739 for (int j = Conversions.Ambiguous.conversions().size()-1; 4740 j >= 0; j--) { 4741 FunctionDecl *Func = Conversions.Ambiguous.conversions()[j]; 4742 NoteOverloadCandidate(Func); 4743 } 4744 } 4745 else { 4746 if (isRValRef) 4747 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4748 << Init->getSourceRange(); 4749 else 4750 Diag(DeclLoc, diag::err_invalid_initialization) 4751 << DeclType << Init->getType() << Init->getSourceRange(); 4752 } 4753 } 4754 return badConversion; 4755 } 4756} 4757 4758static inline bool 4759CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4760 const FunctionDecl *FnDecl) { 4761 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4762 if (isa<NamespaceDecl>(DC)) { 4763 return SemaRef.Diag(FnDecl->getLocation(), 4764 diag::err_operator_new_delete_declared_in_namespace) 4765 << FnDecl->getDeclName(); 4766 } 4767 4768 if (isa<TranslationUnitDecl>(DC) && 4769 FnDecl->getStorageClass() == FunctionDecl::Static) { 4770 return SemaRef.Diag(FnDecl->getLocation(), 4771 diag::err_operator_new_delete_declared_static) 4772 << FnDecl->getDeclName(); 4773 } 4774 4775 return false; 4776} 4777 4778static inline bool 4779CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4780 CanQualType ExpectedResultType, 4781 CanQualType ExpectedFirstParamType, 4782 unsigned DependentParamTypeDiag, 4783 unsigned InvalidParamTypeDiag) { 4784 QualType ResultType = 4785 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4786 4787 // Check that the result type is not dependent. 4788 if (ResultType->isDependentType()) 4789 return SemaRef.Diag(FnDecl->getLocation(), 4790 diag::err_operator_new_delete_dependent_result_type) 4791 << FnDecl->getDeclName() << ExpectedResultType; 4792 4793 // Check that the result type is what we expect. 4794 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4795 return SemaRef.Diag(FnDecl->getLocation(), 4796 diag::err_operator_new_delete_invalid_result_type) 4797 << FnDecl->getDeclName() << ExpectedResultType; 4798 4799 // A function template must have at least 2 parameters. 4800 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4801 return SemaRef.Diag(FnDecl->getLocation(), 4802 diag::err_operator_new_delete_template_too_few_parameters) 4803 << FnDecl->getDeclName(); 4804 4805 // The function decl must have at least 1 parameter. 4806 if (FnDecl->getNumParams() == 0) 4807 return SemaRef.Diag(FnDecl->getLocation(), 4808 diag::err_operator_new_delete_too_few_parameters) 4809 << FnDecl->getDeclName(); 4810 4811 // Check the the first parameter type is not dependent. 4812 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4813 if (FirstParamType->isDependentType()) 4814 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4815 << FnDecl->getDeclName() << ExpectedFirstParamType; 4816 4817 // Check that the first parameter type is what we expect. 4818 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4819 ExpectedFirstParamType) 4820 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4821 << FnDecl->getDeclName() << ExpectedFirstParamType; 4822 4823 return false; 4824} 4825 4826static bool 4827CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4828 // C++ [basic.stc.dynamic.allocation]p1: 4829 // A program is ill-formed if an allocation function is declared in a 4830 // namespace scope other than global scope or declared static in global 4831 // scope. 4832 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4833 return true; 4834 4835 CanQualType SizeTy = 4836 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4837 4838 // C++ [basic.stc.dynamic.allocation]p1: 4839 // The return type shall be void*. The first parameter shall have type 4840 // std::size_t. 4841 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4842 SizeTy, 4843 diag::err_operator_new_dependent_param_type, 4844 diag::err_operator_new_param_type)) 4845 return true; 4846 4847 // C++ [basic.stc.dynamic.allocation]p1: 4848 // The first parameter shall not have an associated default argument. 4849 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4850 return SemaRef.Diag(FnDecl->getLocation(), 4851 diag::err_operator_new_default_arg) 4852 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4853 4854 return false; 4855} 4856 4857static bool 4858CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4859 // C++ [basic.stc.dynamic.deallocation]p1: 4860 // A program is ill-formed if deallocation functions are declared in a 4861 // namespace scope other than global scope or declared static in global 4862 // scope. 4863 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4864 return true; 4865 4866 // C++ [basic.stc.dynamic.deallocation]p2: 4867 // Each deallocation function shall return void and its first parameter 4868 // shall be void*. 4869 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4870 SemaRef.Context.VoidPtrTy, 4871 diag::err_operator_delete_dependent_param_type, 4872 diag::err_operator_delete_param_type)) 4873 return true; 4874 4875 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4876 if (FirstParamType->isDependentType()) 4877 return SemaRef.Diag(FnDecl->getLocation(), 4878 diag::err_operator_delete_dependent_param_type) 4879 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4880 4881 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4882 SemaRef.Context.VoidPtrTy) 4883 return SemaRef.Diag(FnDecl->getLocation(), 4884 diag::err_operator_delete_param_type) 4885 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4886 4887 return false; 4888} 4889 4890/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4891/// of this overloaded operator is well-formed. If so, returns false; 4892/// otherwise, emits appropriate diagnostics and returns true. 4893bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4894 assert(FnDecl && FnDecl->isOverloadedOperator() && 4895 "Expected an overloaded operator declaration"); 4896 4897 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4898 4899 // C++ [over.oper]p5: 4900 // The allocation and deallocation functions, operator new, 4901 // operator new[], operator delete and operator delete[], are 4902 // described completely in 3.7.3. The attributes and restrictions 4903 // found in the rest of this subclause do not apply to them unless 4904 // explicitly stated in 3.7.3. 4905 if (Op == OO_Delete || Op == OO_Array_Delete) 4906 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4907 4908 if (Op == OO_New || Op == OO_Array_New) 4909 return CheckOperatorNewDeclaration(*this, FnDecl); 4910 4911 // C++ [over.oper]p6: 4912 // An operator function shall either be a non-static member 4913 // function or be a non-member function and have at least one 4914 // parameter whose type is a class, a reference to a class, an 4915 // enumeration, or a reference to an enumeration. 4916 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4917 if (MethodDecl->isStatic()) 4918 return Diag(FnDecl->getLocation(), 4919 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4920 } else { 4921 bool ClassOrEnumParam = false; 4922 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4923 ParamEnd = FnDecl->param_end(); 4924 Param != ParamEnd; ++Param) { 4925 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4926 if (ParamType->isDependentType() || ParamType->isRecordType() || 4927 ParamType->isEnumeralType()) { 4928 ClassOrEnumParam = true; 4929 break; 4930 } 4931 } 4932 4933 if (!ClassOrEnumParam) 4934 return Diag(FnDecl->getLocation(), 4935 diag::err_operator_overload_needs_class_or_enum) 4936 << FnDecl->getDeclName(); 4937 } 4938 4939 // C++ [over.oper]p8: 4940 // An operator function cannot have default arguments (8.3.6), 4941 // except where explicitly stated below. 4942 // 4943 // Only the function-call operator allows default arguments 4944 // (C++ [over.call]p1). 4945 if (Op != OO_Call) { 4946 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4947 Param != FnDecl->param_end(); ++Param) { 4948 if ((*Param)->hasDefaultArg()) 4949 return Diag((*Param)->getLocation(), 4950 diag::err_operator_overload_default_arg) 4951 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4952 } 4953 } 4954 4955 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4956 { false, false, false } 4957#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4958 , { Unary, Binary, MemberOnly } 4959#include "clang/Basic/OperatorKinds.def" 4960 }; 4961 4962 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4963 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4964 bool MustBeMemberOperator = OperatorUses[Op][2]; 4965 4966 // C++ [over.oper]p8: 4967 // [...] Operator functions cannot have more or fewer parameters 4968 // than the number required for the corresponding operator, as 4969 // described in the rest of this subclause. 4970 unsigned NumParams = FnDecl->getNumParams() 4971 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4972 if (Op != OO_Call && 4973 ((NumParams == 1 && !CanBeUnaryOperator) || 4974 (NumParams == 2 && !CanBeBinaryOperator) || 4975 (NumParams < 1) || (NumParams > 2))) { 4976 // We have the wrong number of parameters. 4977 unsigned ErrorKind; 4978 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4979 ErrorKind = 2; // 2 -> unary or binary. 4980 } else if (CanBeUnaryOperator) { 4981 ErrorKind = 0; // 0 -> unary 4982 } else { 4983 assert(CanBeBinaryOperator && 4984 "All non-call overloaded operators are unary or binary!"); 4985 ErrorKind = 1; // 1 -> binary 4986 } 4987 4988 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4989 << FnDecl->getDeclName() << NumParams << ErrorKind; 4990 } 4991 4992 // Overloaded operators other than operator() cannot be variadic. 4993 if (Op != OO_Call && 4994 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4995 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4996 << FnDecl->getDeclName(); 4997 } 4998 4999 // Some operators must be non-static member functions. 5000 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5001 return Diag(FnDecl->getLocation(), 5002 diag::err_operator_overload_must_be_member) 5003 << FnDecl->getDeclName(); 5004 } 5005 5006 // C++ [over.inc]p1: 5007 // The user-defined function called operator++ implements the 5008 // prefix and postfix ++ operator. If this function is a member 5009 // function with no parameters, or a non-member function with one 5010 // parameter of class or enumeration type, it defines the prefix 5011 // increment operator ++ for objects of that type. If the function 5012 // is a member function with one parameter (which shall be of type 5013 // int) or a non-member function with two parameters (the second 5014 // of which shall be of type int), it defines the postfix 5015 // increment operator ++ for objects of that type. 5016 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5017 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5018 bool ParamIsInt = false; 5019 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5020 ParamIsInt = BT->getKind() == BuiltinType::Int; 5021 5022 if (!ParamIsInt) 5023 return Diag(LastParam->getLocation(), 5024 diag::err_operator_overload_post_incdec_must_be_int) 5025 << LastParam->getType() << (Op == OO_MinusMinus); 5026 } 5027 5028 // Notify the class if it got an assignment operator. 5029 if (Op == OO_Equal) { 5030 // Would have returned earlier otherwise. 5031 assert(isa<CXXMethodDecl>(FnDecl) && 5032 "Overloaded = not member, but not filtered."); 5033 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5034 Method->getParent()->addedAssignmentOperator(Context, Method); 5035 } 5036 5037 return false; 5038} 5039 5040/// CheckLiteralOperatorDeclaration - Check whether the declaration 5041/// of this literal operator function is well-formed. If so, returns 5042/// false; otherwise, emits appropriate diagnostics and returns true. 5043bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5044 DeclContext *DC = FnDecl->getDeclContext(); 5045 Decl::Kind Kind = DC->getDeclKind(); 5046 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5047 Kind != Decl::LinkageSpec) { 5048 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5049 << FnDecl->getDeclName(); 5050 return true; 5051 } 5052 5053 bool Valid = false; 5054 5055 // FIXME: Check for the one valid template signature 5056 // template <char...> type operator "" name(); 5057 5058 if (FunctionDecl::param_iterator Param = FnDecl->param_begin()) { 5059 // Check the first parameter 5060 QualType T = (*Param)->getType(); 5061 5062 // unsigned long long int and long double are allowed, but only 5063 // alone. 5064 // We also allow any character type; their omission seems to be a bug 5065 // in n3000 5066 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5067 Context.hasSameType(T, Context.LongDoubleTy) || 5068 Context.hasSameType(T, Context.CharTy) || 5069 Context.hasSameType(T, Context.WCharTy) || 5070 Context.hasSameType(T, Context.Char16Ty) || 5071 Context.hasSameType(T, Context.Char32Ty)) { 5072 if (++Param == FnDecl->param_end()) 5073 Valid = true; 5074 goto FinishedParams; 5075 } 5076 5077 // Otherwise it must be a pointer to const; let's strip those. 5078 const PointerType *PT = T->getAs<PointerType>(); 5079 if (!PT) 5080 goto FinishedParams; 5081 T = PT->getPointeeType(); 5082 if (!T.isConstQualified()) 5083 goto FinishedParams; 5084 T = T.getUnqualifiedType(); 5085 5086 // Move on to the second parameter; 5087 ++Param; 5088 5089 // If there is no second parameter, the first must be a const char * 5090 if (Param == FnDecl->param_end()) { 5091 if (Context.hasSameType(T, Context.CharTy)) 5092 Valid = true; 5093 goto FinishedParams; 5094 } 5095 5096 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5097 // are allowed as the first parameter to a two-parameter function 5098 if (!(Context.hasSameType(T, Context.CharTy) || 5099 Context.hasSameType(T, Context.WCharTy) || 5100 Context.hasSameType(T, Context.Char16Ty) || 5101 Context.hasSameType(T, Context.Char32Ty))) 5102 goto FinishedParams; 5103 5104 // The second and final parameter must be an std::size_t 5105 T = (*Param)->getType().getUnqualifiedType(); 5106 if (Context.hasSameType(T, Context.getSizeType()) && 5107 ++Param == FnDecl->param_end()) 5108 Valid = true; 5109 } 5110 5111 // FIXME: This diagnostic is absolutely terrible. 5112FinishedParams: 5113 if (!Valid) { 5114 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5115 << FnDecl->getDeclName(); 5116 return true; 5117 } 5118 5119 return false; 5120} 5121 5122/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5123/// linkage specification, including the language and (if present) 5124/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5125/// the location of the language string literal, which is provided 5126/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5127/// the '{' brace. Otherwise, this linkage specification does not 5128/// have any braces. 5129Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5130 SourceLocation ExternLoc, 5131 SourceLocation LangLoc, 5132 const char *Lang, 5133 unsigned StrSize, 5134 SourceLocation LBraceLoc) { 5135 LinkageSpecDecl::LanguageIDs Language; 5136 if (strncmp(Lang, "\"C\"", StrSize) == 0) 5137 Language = LinkageSpecDecl::lang_c; 5138 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 5139 Language = LinkageSpecDecl::lang_cxx; 5140 else { 5141 Diag(LangLoc, diag::err_bad_language); 5142 return DeclPtrTy(); 5143 } 5144 5145 // FIXME: Add all the various semantics of linkage specifications 5146 5147 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5148 LangLoc, Language, 5149 LBraceLoc.isValid()); 5150 CurContext->addDecl(D); 5151 PushDeclContext(S, D); 5152 return DeclPtrTy::make(D); 5153} 5154 5155/// ActOnFinishLinkageSpecification - Completely the definition of 5156/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5157/// valid, it's the position of the closing '}' brace in a linkage 5158/// specification that uses braces. 5159Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5160 DeclPtrTy LinkageSpec, 5161 SourceLocation RBraceLoc) { 5162 if (LinkageSpec) 5163 PopDeclContext(); 5164 return LinkageSpec; 5165} 5166 5167/// \brief Perform semantic analysis for the variable declaration that 5168/// occurs within a C++ catch clause, returning the newly-created 5169/// variable. 5170VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5171 TypeSourceInfo *TInfo, 5172 IdentifierInfo *Name, 5173 SourceLocation Loc, 5174 SourceRange Range) { 5175 bool Invalid = false; 5176 5177 // Arrays and functions decay. 5178 if (ExDeclType->isArrayType()) 5179 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5180 else if (ExDeclType->isFunctionType()) 5181 ExDeclType = Context.getPointerType(ExDeclType); 5182 5183 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5184 // The exception-declaration shall not denote a pointer or reference to an 5185 // incomplete type, other than [cv] void*. 5186 // N2844 forbids rvalue references. 5187 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5188 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5189 Invalid = true; 5190 } 5191 5192 QualType BaseType = ExDeclType; 5193 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5194 unsigned DK = diag::err_catch_incomplete; 5195 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5196 BaseType = Ptr->getPointeeType(); 5197 Mode = 1; 5198 DK = diag::err_catch_incomplete_ptr; 5199 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5200 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5201 BaseType = Ref->getPointeeType(); 5202 Mode = 2; 5203 DK = diag::err_catch_incomplete_ref; 5204 } 5205 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5206 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 5207 Invalid = true; 5208 5209 if (!Invalid && !ExDeclType->isDependentType() && 5210 RequireNonAbstractType(Loc, ExDeclType, 5211 diag::err_abstract_type_in_decl, 5212 AbstractVariableType)) 5213 Invalid = true; 5214 5215 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5216 Name, ExDeclType, TInfo, VarDecl::None); 5217 5218 if (!Invalid) { 5219 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5220 // C++ [except.handle]p16: 5221 // The object declared in an exception-declaration or, if the 5222 // exception-declaration does not specify a name, a temporary (12.2) is 5223 // copy-initialized (8.5) from the exception object. [...] 5224 // The object is destroyed when the handler exits, after the destruction 5225 // of any automatic objects initialized within the handler. 5226 // 5227 // We just pretend to initialize the object with itself, then make sure 5228 // it can be destroyed later. 5229 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5230 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5231 Loc, ExDeclType, 0); 5232 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5233 SourceLocation()); 5234 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5235 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5236 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5237 if (Result.isInvalid()) 5238 Invalid = true; 5239 else 5240 FinalizeVarWithDestructor(ExDecl, RecordTy); 5241 } 5242 } 5243 5244 if (Invalid) 5245 ExDecl->setInvalidDecl(); 5246 5247 return ExDecl; 5248} 5249 5250/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5251/// handler. 5252Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5253 TypeSourceInfo *TInfo = 0; 5254 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5255 5256 bool Invalid = D.isInvalidType(); 5257 IdentifierInfo *II = D.getIdentifier(); 5258 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 5259 // The scope should be freshly made just for us. There is just no way 5260 // it contains any previous declaration. 5261 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5262 if (PrevDecl->isTemplateParameter()) { 5263 // Maybe we will complain about the shadowed template parameter. 5264 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5265 } 5266 } 5267 5268 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5269 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5270 << D.getCXXScopeSpec().getRange(); 5271 Invalid = true; 5272 } 5273 5274 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5275 D.getIdentifier(), 5276 D.getIdentifierLoc(), 5277 D.getDeclSpec().getSourceRange()); 5278 5279 if (Invalid) 5280 ExDecl->setInvalidDecl(); 5281 5282 // Add the exception declaration into this scope. 5283 if (II) 5284 PushOnScopeChains(ExDecl, S); 5285 else 5286 CurContext->addDecl(ExDecl); 5287 5288 ProcessDeclAttributes(S, ExDecl, D); 5289 return DeclPtrTy::make(ExDecl); 5290} 5291 5292Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5293 ExprArg assertexpr, 5294 ExprArg assertmessageexpr) { 5295 Expr *AssertExpr = (Expr *)assertexpr.get(); 5296 StringLiteral *AssertMessage = 5297 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5298 5299 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5300 llvm::APSInt Value(32); 5301 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5302 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5303 AssertExpr->getSourceRange(); 5304 return DeclPtrTy(); 5305 } 5306 5307 if (Value == 0) { 5308 Diag(AssertLoc, diag::err_static_assert_failed) 5309 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5310 } 5311 } 5312 5313 assertexpr.release(); 5314 assertmessageexpr.release(); 5315 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5316 AssertExpr, AssertMessage); 5317 5318 CurContext->addDecl(Decl); 5319 return DeclPtrTy::make(Decl); 5320} 5321 5322/// Handle a friend type declaration. This works in tandem with 5323/// ActOnTag. 5324/// 5325/// Notes on friend class templates: 5326/// 5327/// We generally treat friend class declarations as if they were 5328/// declaring a class. So, for example, the elaborated type specifier 5329/// in a friend declaration is required to obey the restrictions of a 5330/// class-head (i.e. no typedefs in the scope chain), template 5331/// parameters are required to match up with simple template-ids, &c. 5332/// However, unlike when declaring a template specialization, it's 5333/// okay to refer to a template specialization without an empty 5334/// template parameter declaration, e.g. 5335/// friend class A<T>::B<unsigned>; 5336/// We permit this as a special case; if there are any template 5337/// parameters present at all, require proper matching, i.e. 5338/// template <> template <class T> friend class A<int>::B; 5339Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5340 MultiTemplateParamsArg TempParams) { 5341 SourceLocation Loc = DS.getSourceRange().getBegin(); 5342 5343 assert(DS.isFriendSpecified()); 5344 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5345 5346 // Try to convert the decl specifier to a type. This works for 5347 // friend templates because ActOnTag never produces a ClassTemplateDecl 5348 // for a TUK_Friend. 5349 Declarator TheDeclarator(DS, Declarator::MemberContext); 5350 QualType T = GetTypeForDeclarator(TheDeclarator, S); 5351 if (TheDeclarator.isInvalidType()) 5352 return DeclPtrTy(); 5353 5354 // This is definitely an error in C++98. It's probably meant to 5355 // be forbidden in C++0x, too, but the specification is just 5356 // poorly written. 5357 // 5358 // The problem is with declarations like the following: 5359 // template <T> friend A<T>::foo; 5360 // where deciding whether a class C is a friend or not now hinges 5361 // on whether there exists an instantiation of A that causes 5362 // 'foo' to equal C. There are restrictions on class-heads 5363 // (which we declare (by fiat) elaborated friend declarations to 5364 // be) that makes this tractable. 5365 // 5366 // FIXME: handle "template <> friend class A<T>;", which 5367 // is possibly well-formed? Who even knows? 5368 if (TempParams.size() && !isa<ElaboratedType>(T)) { 5369 Diag(Loc, diag::err_tagless_friend_type_template) 5370 << DS.getSourceRange(); 5371 return DeclPtrTy(); 5372 } 5373 5374 // C++ [class.friend]p2: 5375 // An elaborated-type-specifier shall be used in a friend declaration 5376 // for a class.* 5377 // * The class-key of the elaborated-type-specifier is required. 5378 // This is one of the rare places in Clang where it's legitimate to 5379 // ask about the "spelling" of the type. 5380 if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) { 5381 // If we evaluated the type to a record type, suggest putting 5382 // a tag in front. 5383 if (const RecordType *RT = T->getAs<RecordType>()) { 5384 RecordDecl *RD = RT->getDecl(); 5385 5386 std::string InsertionText = std::string(" ") + RD->getKindName(); 5387 5388 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 5389 << (unsigned) RD->getTagKind() 5390 << T 5391 << SourceRange(DS.getFriendSpecLoc()) 5392 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 5393 InsertionText); 5394 return DeclPtrTy(); 5395 }else { 5396 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 5397 << DS.getSourceRange(); 5398 return DeclPtrTy(); 5399 } 5400 } 5401 5402 // Enum types cannot be friends. 5403 if (T->getAs<EnumType>()) { 5404 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 5405 << SourceRange(DS.getFriendSpecLoc()); 5406 return DeclPtrTy(); 5407 } 5408 5409 // C++98 [class.friend]p1: A friend of a class is a function 5410 // or class that is not a member of the class . . . 5411 // This is fixed in DR77, which just barely didn't make the C++03 5412 // deadline. It's also a very silly restriction that seriously 5413 // affects inner classes and which nobody else seems to implement; 5414 // thus we never diagnose it, not even in -pedantic. 5415 5416 Decl *D; 5417 if (TempParams.size()) 5418 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5419 TempParams.size(), 5420 (TemplateParameterList**) TempParams.release(), 5421 T.getTypePtr(), 5422 DS.getFriendSpecLoc()); 5423 else 5424 D = FriendDecl::Create(Context, CurContext, Loc, T.getTypePtr(), 5425 DS.getFriendSpecLoc()); 5426 D->setAccess(AS_public); 5427 CurContext->addDecl(D); 5428 5429 return DeclPtrTy::make(D); 5430} 5431 5432Sema::DeclPtrTy 5433Sema::ActOnFriendFunctionDecl(Scope *S, 5434 Declarator &D, 5435 bool IsDefinition, 5436 MultiTemplateParamsArg TemplateParams) { 5437 const DeclSpec &DS = D.getDeclSpec(); 5438 5439 assert(DS.isFriendSpecified()); 5440 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5441 5442 SourceLocation Loc = D.getIdentifierLoc(); 5443 TypeSourceInfo *TInfo = 0; 5444 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5445 5446 // C++ [class.friend]p1 5447 // A friend of a class is a function or class.... 5448 // Note that this sees through typedefs, which is intended. 5449 // It *doesn't* see through dependent types, which is correct 5450 // according to [temp.arg.type]p3: 5451 // If a declaration acquires a function type through a 5452 // type dependent on a template-parameter and this causes 5453 // a declaration that does not use the syntactic form of a 5454 // function declarator to have a function type, the program 5455 // is ill-formed. 5456 if (!T->isFunctionType()) { 5457 Diag(Loc, diag::err_unexpected_friend); 5458 5459 // It might be worthwhile to try to recover by creating an 5460 // appropriate declaration. 5461 return DeclPtrTy(); 5462 } 5463 5464 // C++ [namespace.memdef]p3 5465 // - If a friend declaration in a non-local class first declares a 5466 // class or function, the friend class or function is a member 5467 // of the innermost enclosing namespace. 5468 // - The name of the friend is not found by simple name lookup 5469 // until a matching declaration is provided in that namespace 5470 // scope (either before or after the class declaration granting 5471 // friendship). 5472 // - If a friend function is called, its name may be found by the 5473 // name lookup that considers functions from namespaces and 5474 // classes associated with the types of the function arguments. 5475 // - When looking for a prior declaration of a class or a function 5476 // declared as a friend, scopes outside the innermost enclosing 5477 // namespace scope are not considered. 5478 5479 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5480 DeclarationName Name = GetNameForDeclarator(D); 5481 assert(Name); 5482 5483 // The context we found the declaration in, or in which we should 5484 // create the declaration. 5485 DeclContext *DC; 5486 5487 // FIXME: handle local classes 5488 5489 // Recover from invalid scope qualifiers as if they just weren't there. 5490 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5491 ForRedeclaration); 5492 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5493 // FIXME: RequireCompleteDeclContext 5494 DC = computeDeclContext(ScopeQual); 5495 5496 // FIXME: handle dependent contexts 5497 if (!DC) return DeclPtrTy(); 5498 5499 LookupQualifiedName(Previous, DC); 5500 5501 // If searching in that context implicitly found a declaration in 5502 // a different context, treat it like it wasn't found at all. 5503 // TODO: better diagnostics for this case. Suggesting the right 5504 // qualified scope would be nice... 5505 // FIXME: getRepresentativeDecl() is not right here at all 5506 if (Previous.empty() || 5507 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5508 D.setInvalidType(); 5509 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5510 return DeclPtrTy(); 5511 } 5512 5513 // C++ [class.friend]p1: A friend of a class is a function or 5514 // class that is not a member of the class . . . 5515 if (DC->Equals(CurContext)) 5516 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5517 5518 // Otherwise walk out to the nearest namespace scope looking for matches. 5519 } else { 5520 // TODO: handle local class contexts. 5521 5522 DC = CurContext; 5523 while (true) { 5524 // Skip class contexts. If someone can cite chapter and verse 5525 // for this behavior, that would be nice --- it's what GCC and 5526 // EDG do, and it seems like a reasonable intent, but the spec 5527 // really only says that checks for unqualified existing 5528 // declarations should stop at the nearest enclosing namespace, 5529 // not that they should only consider the nearest enclosing 5530 // namespace. 5531 while (DC->isRecord()) 5532 DC = DC->getParent(); 5533 5534 LookupQualifiedName(Previous, DC); 5535 5536 // TODO: decide what we think about using declarations. 5537 if (!Previous.empty()) 5538 break; 5539 5540 if (DC->isFileContext()) break; 5541 DC = DC->getParent(); 5542 } 5543 5544 // C++ [class.friend]p1: A friend of a class is a function or 5545 // class that is not a member of the class . . . 5546 // C++0x changes this for both friend types and functions. 5547 // Most C++ 98 compilers do seem to give an error here, so 5548 // we do, too. 5549 if (!Previous.empty() && DC->Equals(CurContext) 5550 && !getLangOptions().CPlusPlus0x) 5551 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5552 } 5553 5554 if (DC->isFileContext()) { 5555 // This implies that it has to be an operator or function. 5556 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5557 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5558 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5559 Diag(Loc, diag::err_introducing_special_friend) << 5560 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5561 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5562 return DeclPtrTy(); 5563 } 5564 } 5565 5566 bool Redeclaration = false; 5567 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5568 move(TemplateParams), 5569 IsDefinition, 5570 Redeclaration); 5571 if (!ND) return DeclPtrTy(); 5572 5573 assert(ND->getDeclContext() == DC); 5574 assert(ND->getLexicalDeclContext() == CurContext); 5575 5576 // Add the function declaration to the appropriate lookup tables, 5577 // adjusting the redeclarations list as necessary. We don't 5578 // want to do this yet if the friending class is dependent. 5579 // 5580 // Also update the scope-based lookup if the target context's 5581 // lookup context is in lexical scope. 5582 if (!CurContext->isDependentContext()) { 5583 DC = DC->getLookupContext(); 5584 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5585 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5586 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5587 } 5588 5589 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5590 D.getIdentifierLoc(), ND, 5591 DS.getFriendSpecLoc()); 5592 FrD->setAccess(AS_public); 5593 CurContext->addDecl(FrD); 5594 5595 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) 5596 FrD->setSpecialization(true); 5597 5598 return DeclPtrTy::make(ND); 5599} 5600 5601void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5602 AdjustDeclIfTemplate(dcl); 5603 5604 Decl *Dcl = dcl.getAs<Decl>(); 5605 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5606 if (!Fn) { 5607 Diag(DelLoc, diag::err_deleted_non_function); 5608 return; 5609 } 5610 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5611 Diag(DelLoc, diag::err_deleted_decl_not_first); 5612 Diag(Prev->getLocation(), diag::note_previous_declaration); 5613 // If the declaration wasn't the first, we delete the function anyway for 5614 // recovery. 5615 } 5616 Fn->setDeleted(); 5617} 5618 5619static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5620 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5621 ++CI) { 5622 Stmt *SubStmt = *CI; 5623 if (!SubStmt) 5624 continue; 5625 if (isa<ReturnStmt>(SubStmt)) 5626 Self.Diag(SubStmt->getSourceRange().getBegin(), 5627 diag::err_return_in_constructor_handler); 5628 if (!isa<Expr>(SubStmt)) 5629 SearchForReturnInStmt(Self, SubStmt); 5630 } 5631} 5632 5633void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5634 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5635 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5636 SearchForReturnInStmt(*this, Handler); 5637 } 5638} 5639 5640bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5641 const CXXMethodDecl *Old) { 5642 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5643 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5644 5645 if (Context.hasSameType(NewTy, OldTy) || 5646 NewTy->isDependentType() || OldTy->isDependentType()) 5647 return false; 5648 5649 // Check if the return types are covariant 5650 QualType NewClassTy, OldClassTy; 5651 5652 /// Both types must be pointers or references to classes. 5653 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5654 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5655 NewClassTy = NewPT->getPointeeType(); 5656 OldClassTy = OldPT->getPointeeType(); 5657 } 5658 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5659 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5660 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5661 NewClassTy = NewRT->getPointeeType(); 5662 OldClassTy = OldRT->getPointeeType(); 5663 } 5664 } 5665 } 5666 5667 // The return types aren't either both pointers or references to a class type. 5668 if (NewClassTy.isNull()) { 5669 Diag(New->getLocation(), 5670 diag::err_different_return_type_for_overriding_virtual_function) 5671 << New->getDeclName() << NewTy << OldTy; 5672 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5673 5674 return true; 5675 } 5676 5677 // C++ [class.virtual]p6: 5678 // If the return type of D::f differs from the return type of B::f, the 5679 // class type in the return type of D::f shall be complete at the point of 5680 // declaration of D::f or shall be the class type D. 5681 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5682 if (!RT->isBeingDefined() && 5683 RequireCompleteType(New->getLocation(), NewClassTy, 5684 PDiag(diag::err_covariant_return_incomplete) 5685 << New->getDeclName())) 5686 return true; 5687 } 5688 5689 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5690 // Check if the new class derives from the old class. 5691 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5692 Diag(New->getLocation(), 5693 diag::err_covariant_return_not_derived) 5694 << New->getDeclName() << NewTy << OldTy; 5695 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5696 return true; 5697 } 5698 5699 // Check if we the conversion from derived to base is valid. 5700 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, ADK_covariance, 5701 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5702 // FIXME: Should this point to the return type? 5703 New->getLocation(), SourceRange(), New->getDeclName())) { 5704 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5705 return true; 5706 } 5707 } 5708 5709 // The qualifiers of the return types must be the same. 5710 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5711 Diag(New->getLocation(), 5712 diag::err_covariant_return_type_different_qualifications) 5713 << New->getDeclName() << NewTy << OldTy; 5714 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5715 return true; 5716 }; 5717 5718 5719 // The new class type must have the same or less qualifiers as the old type. 5720 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5721 Diag(New->getLocation(), 5722 diag::err_covariant_return_type_class_type_more_qualified) 5723 << New->getDeclName() << NewTy << OldTy; 5724 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5725 return true; 5726 }; 5727 5728 return false; 5729} 5730 5731bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5732 const CXXMethodDecl *Old) 5733{ 5734 if (Old->hasAttr<FinalAttr>()) { 5735 Diag(New->getLocation(), diag::err_final_function_overridden) 5736 << New->getDeclName(); 5737 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5738 return true; 5739 } 5740 5741 return false; 5742} 5743 5744/// \brief Mark the given method pure. 5745/// 5746/// \param Method the method to be marked pure. 5747/// 5748/// \param InitRange the source range that covers the "0" initializer. 5749bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5750 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5751 Method->setPure(); 5752 5753 // A class is abstract if at least one function is pure virtual. 5754 Method->getParent()->setAbstract(true); 5755 return false; 5756 } 5757 5758 if (!Method->isInvalidDecl()) 5759 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5760 << Method->getDeclName() << InitRange; 5761 return true; 5762} 5763 5764/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5765/// an initializer for the out-of-line declaration 'Dcl'. The scope 5766/// is a fresh scope pushed for just this purpose. 5767/// 5768/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5769/// static data member of class X, names should be looked up in the scope of 5770/// class X. 5771void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5772 // If there is no declaration, there was an error parsing it. 5773 Decl *D = Dcl.getAs<Decl>(); 5774 if (D == 0) return; 5775 5776 // We should only get called for declarations with scope specifiers, like: 5777 // int foo::bar; 5778 assert(D->isOutOfLine()); 5779 EnterDeclaratorContext(S, D->getDeclContext()); 5780} 5781 5782/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5783/// initializer for the out-of-line declaration 'Dcl'. 5784void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5785 // If there is no declaration, there was an error parsing it. 5786 Decl *D = Dcl.getAs<Decl>(); 5787 if (D == 0) return; 5788 5789 assert(D->isOutOfLine()); 5790 ExitDeclaratorContext(S); 5791} 5792 5793/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5794/// C++ if/switch/while/for statement. 5795/// e.g: "if (int x = f()) {...}" 5796Action::DeclResult 5797Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5798 // C++ 6.4p2: 5799 // The declarator shall not specify a function or an array. 5800 // The type-specifier-seq shall not contain typedef and shall not declare a 5801 // new class or enumeration. 5802 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5803 "Parser allowed 'typedef' as storage class of condition decl."); 5804 5805 TypeSourceInfo *TInfo = 0; 5806 TagDecl *OwnedTag = 0; 5807 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5808 5809 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5810 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5811 // would be created and CXXConditionDeclExpr wants a VarDecl. 5812 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5813 << D.getSourceRange(); 5814 return DeclResult(); 5815 } else if (OwnedTag && OwnedTag->isDefinition()) { 5816 // The type-specifier-seq shall not declare a new class or enumeration. 5817 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5818 } 5819 5820 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5821 if (!Dcl) 5822 return DeclResult(); 5823 5824 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5825 VD->setDeclaredInCondition(true); 5826 return Dcl; 5827} 5828 5829static bool needsVtable(CXXMethodDecl *MD, ASTContext &Context) { 5830 // Ignore dependent types. 5831 if (MD->isDependentContext()) 5832 return false; 5833 5834 // Ignore declarations that are not definitions. 5835 if (!MD->isThisDeclarationADefinition()) 5836 return false; 5837 5838 CXXRecordDecl *RD = MD->getParent(); 5839 5840 // Ignore classes without a vtable. 5841 if (!RD->isDynamicClass()) 5842 return false; 5843 5844 switch (MD->getParent()->getTemplateSpecializationKind()) { 5845 case TSK_Undeclared: 5846 case TSK_ExplicitSpecialization: 5847 // Classes that aren't instantiations of templates don't need their 5848 // virtual methods marked until we see the definition of the key 5849 // function. 5850 break; 5851 5852 case TSK_ImplicitInstantiation: 5853 // This is a constructor of a class template; mark all of the virtual 5854 // members as referenced to ensure that they get instantiatied. 5855 if (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)) 5856 return true; 5857 break; 5858 5859 case TSK_ExplicitInstantiationDeclaration: 5860 return true; //FIXME: This looks wrong. 5861 5862 case TSK_ExplicitInstantiationDefinition: 5863 // This is method of a explicit instantiation; mark all of the virtual 5864 // members as referenced to ensure that they get instantiatied. 5865 return true; 5866 } 5867 5868 // Consider only out-of-line definitions of member functions. When we see 5869 // an inline definition, it's too early to compute the key function. 5870 if (!MD->isOutOfLine()) 5871 return false; 5872 5873 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5874 5875 // If there is no key function, we will need a copy of the vtable. 5876 if (!KeyFunction) 5877 return true; 5878 5879 // If this is the key function, we need to mark virtual members. 5880 if (KeyFunction->getCanonicalDecl() == MD->getCanonicalDecl()) 5881 return true; 5882 5883 return false; 5884} 5885 5886void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5887 CXXMethodDecl *MD) { 5888 CXXRecordDecl *RD = MD->getParent(); 5889 5890 // We will need to mark all of the virtual members as referenced to build the 5891 // vtable. 5892 // We actually call MarkVirtualMembersReferenced instead of adding to 5893 // ClassesWithUnmarkedVirtualMembers because this marking is needed by 5894 // codegen that will happend before we finish parsing the file. 5895 if (needsVtable(MD, Context)) 5896 MarkVirtualMembersReferenced(Loc, RD); 5897} 5898 5899bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5900 if (ClassesWithUnmarkedVirtualMembers.empty()) 5901 return false; 5902 5903 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 5904 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 5905 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 5906 ClassesWithUnmarkedVirtualMembers.pop_back(); 5907 MarkVirtualMembersReferenced(Loc, RD); 5908 } 5909 5910 return true; 5911} 5912 5913void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, CXXRecordDecl *RD) { 5914 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5915 e = RD->method_end(); i != e; ++i) { 5916 CXXMethodDecl *MD = *i; 5917 5918 // C++ [basic.def.odr]p2: 5919 // [...] A virtual member function is used if it is not pure. [...] 5920 if (MD->isVirtual() && !MD->isPure()) 5921 MarkDeclarationReferenced(Loc, MD); 5922 } 5923} 5924