SemaDeclCXX.cpp revision 7edfb69ae192d9c1f5b1f32af30130f34f98386e
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 "Lookup.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/CXXInheritance.h" 19#include "clang/AST/DeclVisitor.h" 20#include "clang/AST/TypeOrdering.h" 21#include "clang/AST/StmtVisitor.h" 22#include "clang/Parse/DeclSpec.h" 23#include "clang/Parse/Template.h" 24#include "clang/Basic/PartialDiagnostic.h" 25#include "clang/Lex/Preprocessor.h" 26#include "llvm/ADT/STLExtras.h" 27#include "llvm/Support/Compiler.h" 28#include <algorithm> // for std::equal 29#include <map> 30#include <set> 31 32using namespace clang; 33 34//===----------------------------------------------------------------------===// 35// CheckDefaultArgumentVisitor 36//===----------------------------------------------------------------------===// 37 38namespace { 39 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 40 /// the default argument of a parameter to determine whether it 41 /// contains any ill-formed subexpressions. For example, this will 42 /// diagnose the use of local variables or parameters within the 43 /// default argument expression. 44 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 45 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 46 Expr *DefaultArg; 47 Sema *S; 48 49 public: 50 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 51 : DefaultArg(defarg), S(s) {} 52 53 bool VisitExpr(Expr *Node); 54 bool VisitDeclRefExpr(DeclRefExpr *DRE); 55 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 56 }; 57 58 /// VisitExpr - Visit all of the children of this expression. 59 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 60 bool IsInvalid = false; 61 for (Stmt::child_iterator I = Node->child_begin(), 62 E = Node->child_end(); I != E; ++I) 63 IsInvalid |= Visit(*I); 64 return IsInvalid; 65 } 66 67 /// VisitDeclRefExpr - Visit a reference to a declaration, to 68 /// determine whether this declaration can be used in the default 69 /// argument expression. 70 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 71 NamedDecl *Decl = DRE->getDecl(); 72 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 73 // C++ [dcl.fct.default]p9 74 // Default arguments are evaluated each time the function is 75 // called. The order of evaluation of function arguments is 76 // unspecified. Consequently, parameters of a function shall not 77 // be used in default argument expressions, even if they are not 78 // evaluated. Parameters of a function declared before a default 79 // argument expression are in scope and can hide namespace and 80 // class member names. 81 return S->Diag(DRE->getSourceRange().getBegin(), 82 diag::err_param_default_argument_references_param) 83 << Param->getDeclName() << DefaultArg->getSourceRange(); 84 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 85 // C++ [dcl.fct.default]p7 86 // Local variables shall not be used in default argument 87 // expressions. 88 if (VDecl->isBlockVarDecl()) 89 return S->Diag(DRE->getSourceRange().getBegin(), 90 diag::err_param_default_argument_references_local) 91 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 92 } 93 94 return false; 95 } 96 97 /// VisitCXXThisExpr - Visit a C++ "this" expression. 98 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 99 // C++ [dcl.fct.default]p8: 100 // The keyword this shall not be used in a default argument of a 101 // member function. 102 return S->Diag(ThisE->getSourceRange().getBegin(), 103 diag::err_param_default_argument_references_this) 104 << ThisE->getSourceRange(); 105 } 106} 107 108bool 109Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 110 SourceLocation EqualLoc) { 111 QualType ParamType = Param->getType(); 112 113 if (RequireCompleteType(Param->getLocation(), Param->getType(), 114 diag::err_typecheck_decl_incomplete_type)) { 115 Param->setInvalidDecl(); 116 return true; 117 } 118 119 Expr *Arg = (Expr *)DefaultArg.get(); 120 121 // C++ [dcl.fct.default]p5 122 // A default argument expression is implicitly converted (clause 123 // 4) to the parameter type. The default argument expression has 124 // the same semantic constraints as the initializer expression in 125 // a declaration of a variable of the parameter type, using the 126 // copy-initialization semantics (8.5). 127 if (CheckInitializerTypes(Arg, ParamType, EqualLoc, 128 Param->getDeclName(), /*DirectInit=*/false)) 129 return true; 130 131 Arg = MaybeCreateCXXExprWithTemporaries(Arg, /*DestroyTemps=*/false); 132 133 // Okay: add the default argument to the parameter 134 Param->setDefaultArg(Arg); 135 136 DefaultArg.release(); 137 138 return false; 139} 140 141/// ActOnParamDefaultArgument - Check whether the default argument 142/// provided for a function parameter is well-formed. If so, attach it 143/// to the parameter declaration. 144void 145Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 146 ExprArg defarg) { 147 if (!param || !defarg.get()) 148 return; 149 150 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 151 UnparsedDefaultArgLocs.erase(Param); 152 153 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 154 QualType ParamType = Param->getType(); 155 156 // Default arguments are only permitted in C++ 157 if (!getLangOptions().CPlusPlus) { 158 Diag(EqualLoc, diag::err_param_default_argument) 159 << DefaultArg->getSourceRange(); 160 Param->setInvalidDecl(); 161 return; 162 } 163 164 // Check that the default argument is well-formed 165 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 166 if (DefaultArgChecker.Visit(DefaultArg.get())) { 167 Param->setInvalidDecl(); 168 return; 169 } 170 171 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 172} 173 174/// ActOnParamUnparsedDefaultArgument - We've seen a default 175/// argument for a function parameter, but we can't parse it yet 176/// because we're inside a class definition. Note that this default 177/// argument will be parsed later. 178void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 179 SourceLocation EqualLoc, 180 SourceLocation ArgLoc) { 181 if (!param) 182 return; 183 184 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 185 if (Param) 186 Param->setUnparsedDefaultArg(); 187 188 UnparsedDefaultArgLocs[Param] = ArgLoc; 189} 190 191/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 192/// the default argument for the parameter param failed. 193void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 194 if (!param) 195 return; 196 197 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 198 199 Param->setInvalidDecl(); 200 201 UnparsedDefaultArgLocs.erase(Param); 202} 203 204/// CheckExtraCXXDefaultArguments - Check for any extra default 205/// arguments in the declarator, which is not a function declaration 206/// or definition and therefore is not permitted to have default 207/// arguments. This routine should be invoked for every declarator 208/// that is not a function declaration or definition. 209void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 210 // C++ [dcl.fct.default]p3 211 // A default argument expression shall be specified only in the 212 // parameter-declaration-clause of a function declaration or in a 213 // template-parameter (14.1). It shall not be specified for a 214 // parameter pack. If it is specified in a 215 // parameter-declaration-clause, it shall not occur within a 216 // declarator or abstract-declarator of a parameter-declaration. 217 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 218 DeclaratorChunk &chunk = D.getTypeObject(i); 219 if (chunk.Kind == DeclaratorChunk::Function) { 220 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 221 ParmVarDecl *Param = 222 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 223 if (Param->hasUnparsedDefaultArg()) { 224 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 225 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 226 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 227 delete Toks; 228 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 229 } else if (Param->getDefaultArg()) { 230 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 231 << Param->getDefaultArg()->getSourceRange(); 232 Param->setDefaultArg(0); 233 } 234 } 235 } 236 } 237} 238 239// MergeCXXFunctionDecl - Merge two declarations of the same C++ 240// function, once we already know that they have the same 241// type. Subroutine of MergeFunctionDecl. Returns true if there was an 242// error, false otherwise. 243bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 244 bool Invalid = false; 245 246 // C++ [dcl.fct.default]p4: 247 // For non-template functions, default arguments can be added in 248 // later declarations of a function in the same 249 // scope. Declarations in different scopes have completely 250 // distinct sets of default arguments. That is, declarations in 251 // inner scopes do not acquire default arguments from 252 // declarations in outer scopes, and vice versa. In a given 253 // function declaration, all parameters subsequent to a 254 // parameter with a default argument shall have default 255 // arguments supplied in this or previous declarations. A 256 // default argument shall not be redefined by a later 257 // declaration (not even to the same value). 258 // 259 // C++ [dcl.fct.default]p6: 260 // Except for member functions of class templates, the default arguments 261 // in a member function definition that appears outside of the class 262 // definition are added to the set of default arguments provided by the 263 // member function declaration in the class definition. 264 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 265 ParmVarDecl *OldParam = Old->getParamDecl(p); 266 ParmVarDecl *NewParam = New->getParamDecl(p); 267 268 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 269 // FIXME: If the parameter doesn't have an identifier then the location 270 // points to the '=' which means that the fixit hint won't remove any 271 // extra spaces between the type and the '='. 272 SourceLocation Begin = NewParam->getLocation(); 273 if (NewParam->getIdentifier()) 274 Begin = PP.getLocForEndOfToken(Begin); 275 276 Diag(NewParam->getLocation(), 277 diag::err_param_default_argument_redefinition) 278 << NewParam->getDefaultArgRange() 279 << CodeModificationHint::CreateRemoval(SourceRange(Begin, 280 NewParam->getLocEnd())); 281 282 // Look for the function declaration where the default argument was 283 // actually written, which may be a declaration prior to Old. 284 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 285 Older; Older = Older->getPreviousDeclaration()) { 286 if (!Older->getParamDecl(p)->hasDefaultArg()) 287 break; 288 289 OldParam = Older->getParamDecl(p); 290 } 291 292 Diag(OldParam->getLocation(), diag::note_previous_definition) 293 << OldParam->getDefaultArgRange(); 294 Invalid = true; 295 } else if (OldParam->hasDefaultArg()) { 296 // Merge the old default argument into the new parameter 297 if (OldParam->hasUninstantiatedDefaultArg()) 298 NewParam->setUninstantiatedDefaultArg( 299 OldParam->getUninstantiatedDefaultArg()); 300 else 301 NewParam->setDefaultArg(OldParam->getDefaultArg()); 302 } else if (NewParam->hasDefaultArg()) { 303 if (New->getDescribedFunctionTemplate()) { 304 // Paragraph 4, quoted above, only applies to non-template functions. 305 Diag(NewParam->getLocation(), 306 diag::err_param_default_argument_template_redecl) 307 << NewParam->getDefaultArgRange(); 308 Diag(Old->getLocation(), diag::note_template_prev_declaration) 309 << false; 310 } else if (New->getTemplateSpecializationKind() 311 != TSK_ImplicitInstantiation && 312 New->getTemplateSpecializationKind() != TSK_Undeclared) { 313 // C++ [temp.expr.spec]p21: 314 // Default function arguments shall not be specified in a declaration 315 // or a definition for one of the following explicit specializations: 316 // - the explicit specialization of a function template; 317 // - the explicit specialization of a member function template; 318 // - the explicit specialization of a member function of a class 319 // template where the class template specialization to which the 320 // member function specialization belongs is implicitly 321 // instantiated. 322 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 323 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 324 << New->getDeclName() 325 << NewParam->getDefaultArgRange(); 326 } else if (New->getDeclContext()->isDependentContext()) { 327 // C++ [dcl.fct.default]p6 (DR217): 328 // Default arguments for a member function of a class template shall 329 // be specified on the initial declaration of the member function 330 // within the class template. 331 // 332 // Reading the tea leaves a bit in DR217 and its reference to DR205 333 // leads me to the conclusion that one cannot add default function 334 // arguments for an out-of-line definition of a member function of a 335 // dependent type. 336 int WhichKind = 2; 337 if (CXXRecordDecl *Record 338 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 339 if (Record->getDescribedClassTemplate()) 340 WhichKind = 0; 341 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 342 WhichKind = 1; 343 else 344 WhichKind = 2; 345 } 346 347 Diag(NewParam->getLocation(), 348 diag::err_param_default_argument_member_template_redecl) 349 << WhichKind 350 << NewParam->getDefaultArgRange(); 351 } 352 } 353 } 354 355 if (CheckEquivalentExceptionSpec( 356 Old->getType()->getAs<FunctionProtoType>(), Old->getLocation(), 357 New->getType()->getAs<FunctionProtoType>(), New->getLocation())) { 358 Invalid = true; 359 } 360 361 return Invalid; 362} 363 364/// CheckCXXDefaultArguments - Verify that the default arguments for a 365/// function declaration are well-formed according to C++ 366/// [dcl.fct.default]. 367void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 368 unsigned NumParams = FD->getNumParams(); 369 unsigned p; 370 371 // Find first parameter with a default argument 372 for (p = 0; p < NumParams; ++p) { 373 ParmVarDecl *Param = FD->getParamDecl(p); 374 if (Param->hasDefaultArg()) 375 break; 376 } 377 378 // C++ [dcl.fct.default]p4: 379 // In a given function declaration, all parameters 380 // subsequent to a parameter with a default argument shall 381 // have default arguments supplied in this or previous 382 // declarations. A default argument shall not be redefined 383 // by a later declaration (not even to the same value). 384 unsigned LastMissingDefaultArg = 0; 385 for (; p < NumParams; ++p) { 386 ParmVarDecl *Param = FD->getParamDecl(p); 387 if (!Param->hasDefaultArg()) { 388 if (Param->isInvalidDecl()) 389 /* We already complained about this parameter. */; 390 else if (Param->getIdentifier()) 391 Diag(Param->getLocation(), 392 diag::err_param_default_argument_missing_name) 393 << Param->getIdentifier(); 394 else 395 Diag(Param->getLocation(), 396 diag::err_param_default_argument_missing); 397 398 LastMissingDefaultArg = p; 399 } 400 } 401 402 if (LastMissingDefaultArg > 0) { 403 // Some default arguments were missing. Clear out all of the 404 // default arguments up to (and including) the last missing 405 // default argument, so that we leave the function parameters 406 // in a semantically valid state. 407 for (p = 0; p <= LastMissingDefaultArg; ++p) { 408 ParmVarDecl *Param = FD->getParamDecl(p); 409 if (Param->hasDefaultArg()) { 410 if (!Param->hasUnparsedDefaultArg()) 411 Param->getDefaultArg()->Destroy(Context); 412 Param->setDefaultArg(0); 413 } 414 } 415 } 416} 417 418/// isCurrentClassName - Determine whether the identifier II is the 419/// name of the class type currently being defined. In the case of 420/// nested classes, this will only return true if II is the name of 421/// the innermost class. 422bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 423 const CXXScopeSpec *SS) { 424 CXXRecordDecl *CurDecl; 425 if (SS && SS->isSet() && !SS->isInvalid()) { 426 DeclContext *DC = computeDeclContext(*SS, true); 427 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 428 } else 429 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 430 431 if (CurDecl) 432 return &II == CurDecl->getIdentifier(); 433 else 434 return false; 435} 436 437/// \brief Check the validity of a C++ base class specifier. 438/// 439/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 440/// and returns NULL otherwise. 441CXXBaseSpecifier * 442Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 443 SourceRange SpecifierRange, 444 bool Virtual, AccessSpecifier Access, 445 QualType BaseType, 446 SourceLocation BaseLoc) { 447 // C++ [class.union]p1: 448 // A union shall not have base classes. 449 if (Class->isUnion()) { 450 Diag(Class->getLocation(), diag::err_base_clause_on_union) 451 << SpecifierRange; 452 return 0; 453 } 454 455 if (BaseType->isDependentType()) 456 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 457 Class->getTagKind() == RecordDecl::TK_class, 458 Access, BaseType); 459 460 // Base specifiers must be record types. 461 if (!BaseType->isRecordType()) { 462 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 463 return 0; 464 } 465 466 // C++ [class.union]p1: 467 // A union shall not be used as a base class. 468 if (BaseType->isUnionType()) { 469 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 470 return 0; 471 } 472 473 // C++ [class.derived]p2: 474 // The class-name in a base-specifier shall not be an incompletely 475 // defined class. 476 if (RequireCompleteType(BaseLoc, BaseType, 477 PDiag(diag::err_incomplete_base_class) 478 << SpecifierRange)) 479 return 0; 480 481 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 482 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 483 assert(BaseDecl && "Record type has no declaration"); 484 BaseDecl = BaseDecl->getDefinition(Context); 485 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 486 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 487 assert(CXXBaseDecl && "Base type is not a C++ type"); 488 if (!CXXBaseDecl->isEmpty()) 489 Class->setEmpty(false); 490 if (CXXBaseDecl->isPolymorphic()) 491 Class->setPolymorphic(true); 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_class_decl) 496 << BaseType.getAsString(); 497 return 0; 498 } 499 500 // C++ [dcl.init.aggr]p1: 501 // An aggregate is [...] a class with [...] no base classes [...]. 502 Class->setAggregate(false); 503 Class->setPOD(false); 504 505 if (Virtual) { 506 // C++ [class.ctor]p5: 507 // A constructor is trivial if its class has no virtual base classes. 508 Class->setHasTrivialConstructor(false); 509 510 // C++ [class.copy]p6: 511 // A copy constructor is trivial if its class has no virtual base classes. 512 Class->setHasTrivialCopyConstructor(false); 513 514 // C++ [class.copy]p11: 515 // A copy assignment operator is trivial if its class has no virtual 516 // base classes. 517 Class->setHasTrivialCopyAssignment(false); 518 519 // C++0x [meta.unary.prop] is_empty: 520 // T is a class type, but not a union type, with ... no virtual base 521 // classes 522 Class->setEmpty(false); 523 } else { 524 // C++ [class.ctor]p5: 525 // A constructor is trivial if all the direct base classes of its 526 // class have trivial constructors. 527 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialConstructor()) 528 Class->setHasTrivialConstructor(false); 529 530 // C++ [class.copy]p6: 531 // A copy constructor is trivial if all the direct base classes of its 532 // class have trivial copy constructors. 533 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyConstructor()) 534 Class->setHasTrivialCopyConstructor(false); 535 536 // C++ [class.copy]p11: 537 // A copy assignment operator is trivial if all the direct base classes 538 // of its class have trivial copy assignment operators. 539 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyAssignment()) 540 Class->setHasTrivialCopyAssignment(false); 541 } 542 543 // C++ [class.ctor]p3: 544 // A destructor is trivial if all the direct base classes of its class 545 // have trivial destructors. 546 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialDestructor()) 547 Class->setHasTrivialDestructor(false); 548 549 // Create the base specifier. 550 // FIXME: Allocate via ASTContext? 551 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 552 Class->getTagKind() == RecordDecl::TK_class, 553 Access, BaseType); 554} 555 556/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 557/// one entry in the base class list of a class specifier, for 558/// example: 559/// class foo : public bar, virtual private baz { 560/// 'public bar' and 'virtual private baz' are each base-specifiers. 561Sema::BaseResult 562Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 563 bool Virtual, AccessSpecifier Access, 564 TypeTy *basetype, SourceLocation BaseLoc) { 565 if (!classdecl) 566 return true; 567 568 AdjustDeclIfTemplate(classdecl); 569 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 570 QualType BaseType = GetTypeFromParser(basetype); 571 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 572 Virtual, Access, 573 BaseType, BaseLoc)) 574 return BaseSpec; 575 576 return true; 577} 578 579/// \brief Performs the actual work of attaching the given base class 580/// specifiers to a C++ class. 581bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 582 unsigned NumBases) { 583 if (NumBases == 0) 584 return false; 585 586 // Used to keep track of which base types we have already seen, so 587 // that we can properly diagnose redundant direct base types. Note 588 // that the key is always the unqualified canonical type of the base 589 // class. 590 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 591 592 // Copy non-redundant base specifiers into permanent storage. 593 unsigned NumGoodBases = 0; 594 bool Invalid = false; 595 for (unsigned idx = 0; idx < NumBases; ++idx) { 596 QualType NewBaseType 597 = Context.getCanonicalType(Bases[idx]->getType()); 598 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 599 600 if (KnownBaseTypes[NewBaseType]) { 601 // C++ [class.mi]p3: 602 // A class shall not be specified as a direct base class of a 603 // derived class more than once. 604 Diag(Bases[idx]->getSourceRange().getBegin(), 605 diag::err_duplicate_base_class) 606 << KnownBaseTypes[NewBaseType]->getType() 607 << Bases[idx]->getSourceRange(); 608 609 // Delete the duplicate base class specifier; we're going to 610 // overwrite its pointer later. 611 Context.Deallocate(Bases[idx]); 612 613 Invalid = true; 614 } else { 615 // Okay, add this new base class. 616 KnownBaseTypes[NewBaseType] = Bases[idx]; 617 Bases[NumGoodBases++] = Bases[idx]; 618 } 619 } 620 621 // Attach the remaining base class specifiers to the derived class. 622 Class->setBases(Context, Bases, NumGoodBases); 623 624 // Delete the remaining (good) base class specifiers, since their 625 // data has been copied into the CXXRecordDecl. 626 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 627 Context.Deallocate(Bases[idx]); 628 629 return Invalid; 630} 631 632/// ActOnBaseSpecifiers - Attach the given base specifiers to the 633/// class, after checking whether there are any duplicate base 634/// classes. 635void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 636 unsigned NumBases) { 637 if (!ClassDecl || !Bases || !NumBases) 638 return; 639 640 AdjustDeclIfTemplate(ClassDecl); 641 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 642 (CXXBaseSpecifier**)(Bases), NumBases); 643} 644 645/// \brief Determine whether the type \p Derived is a C++ class that is 646/// derived from the type \p Base. 647bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 648 if (!getLangOptions().CPlusPlus) 649 return false; 650 651 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 652 if (!DerivedRT) 653 return false; 654 655 const RecordType *BaseRT = Base->getAs<RecordType>(); 656 if (!BaseRT) 657 return false; 658 659 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 660 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 661 return DerivedRD->isDerivedFrom(BaseRD); 662} 663 664/// \brief Determine whether the type \p Derived is a C++ class that is 665/// derived from the type \p Base. 666bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 667 if (!getLangOptions().CPlusPlus) 668 return false; 669 670 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 671 if (!DerivedRT) 672 return false; 673 674 const RecordType *BaseRT = Base->getAs<RecordType>(); 675 if (!BaseRT) 676 return false; 677 678 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 679 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 680 return DerivedRD->isDerivedFrom(BaseRD, Paths); 681} 682 683/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 684/// conversion (where Derived and Base are class types) is 685/// well-formed, meaning that the conversion is unambiguous (and 686/// that all of the base classes are accessible). Returns true 687/// and emits a diagnostic if the code is ill-formed, returns false 688/// otherwise. Loc is the location where this routine should point to 689/// if there is an error, and Range is the source range to highlight 690/// if there is an error. 691bool 692Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 693 unsigned InaccessibleBaseID, 694 unsigned AmbigiousBaseConvID, 695 SourceLocation Loc, SourceRange Range, 696 DeclarationName Name) { 697 // First, determine whether the path from Derived to Base is 698 // ambiguous. This is slightly more expensive than checking whether 699 // the Derived to Base conversion exists, because here we need to 700 // explore multiple paths to determine if there is an ambiguity. 701 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 702 /*DetectVirtual=*/false); 703 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 704 assert(DerivationOkay && 705 "Can only be used with a derived-to-base conversion"); 706 (void)DerivationOkay; 707 708 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 709 if (InaccessibleBaseID == 0) 710 return false; 711 // Check that the base class can be accessed. 712 return CheckBaseClassAccess(Derived, Base, InaccessibleBaseID, Paths, Loc, 713 Name); 714 } 715 716 // We know that the derived-to-base conversion is ambiguous, and 717 // we're going to produce a diagnostic. Perform the derived-to-base 718 // search just one more time to compute all of the possible paths so 719 // that we can print them out. This is more expensive than any of 720 // the previous derived-to-base checks we've done, but at this point 721 // performance isn't as much of an issue. 722 Paths.clear(); 723 Paths.setRecordingPaths(true); 724 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 725 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 726 (void)StillOkay; 727 728 // Build up a textual representation of the ambiguous paths, e.g., 729 // D -> B -> A, that will be used to illustrate the ambiguous 730 // conversions in the diagnostic. We only print one of the paths 731 // to each base class subobject. 732 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 733 734 Diag(Loc, AmbigiousBaseConvID) 735 << Derived << Base << PathDisplayStr << Range << Name; 736 return true; 737} 738 739bool 740Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 741 SourceLocation Loc, SourceRange Range, 742 bool IgnoreAccess) { 743 return CheckDerivedToBaseConversion(Derived, Base, 744 IgnoreAccess ? 0 : 745 diag::err_conv_to_inaccessible_base, 746 diag::err_ambiguous_derived_to_base_conv, 747 Loc, Range, DeclarationName()); 748} 749 750 751/// @brief Builds a string representing ambiguous paths from a 752/// specific derived class to different subobjects of the same base 753/// class. 754/// 755/// This function builds a string that can be used in error messages 756/// to show the different paths that one can take through the 757/// inheritance hierarchy to go from the derived class to different 758/// subobjects of a base class. The result looks something like this: 759/// @code 760/// struct D -> struct B -> struct A 761/// struct D -> struct C -> struct A 762/// @endcode 763std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 764 std::string PathDisplayStr; 765 std::set<unsigned> DisplayedPaths; 766 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 767 Path != Paths.end(); ++Path) { 768 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 769 // We haven't displayed a path to this particular base 770 // class subobject yet. 771 PathDisplayStr += "\n "; 772 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 773 for (CXXBasePath::const_iterator Element = Path->begin(); 774 Element != Path->end(); ++Element) 775 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 776 } 777 } 778 779 return PathDisplayStr; 780} 781 782//===----------------------------------------------------------------------===// 783// C++ class member Handling 784//===----------------------------------------------------------------------===// 785 786/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 787/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 788/// bitfield width if there is one and 'InitExpr' specifies the initializer if 789/// any. 790Sema::DeclPtrTy 791Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 792 MultiTemplateParamsArg TemplateParameterLists, 793 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 794 const DeclSpec &DS = D.getDeclSpec(); 795 DeclarationName Name = GetNameForDeclarator(D); 796 Expr *BitWidth = static_cast<Expr*>(BW); 797 Expr *Init = static_cast<Expr*>(InitExpr); 798 SourceLocation Loc = D.getIdentifierLoc(); 799 800 bool isFunc = D.isFunctionDeclarator(); 801 802 assert(!DS.isFriendSpecified()); 803 804 // C++ 9.2p6: A member shall not be declared to have automatic storage 805 // duration (auto, register) or with the extern storage-class-specifier. 806 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 807 // data members and cannot be applied to names declared const or static, 808 // and cannot be applied to reference members. 809 switch (DS.getStorageClassSpec()) { 810 case DeclSpec::SCS_unspecified: 811 case DeclSpec::SCS_typedef: 812 case DeclSpec::SCS_static: 813 // FALL THROUGH. 814 break; 815 case DeclSpec::SCS_mutable: 816 if (isFunc) { 817 if (DS.getStorageClassSpecLoc().isValid()) 818 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 819 else 820 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 821 822 // FIXME: It would be nicer if the keyword was ignored only for this 823 // declarator. Otherwise we could get follow-up errors. 824 D.getMutableDeclSpec().ClearStorageClassSpecs(); 825 } else { 826 QualType T = GetTypeForDeclarator(D, S); 827 diag::kind err = static_cast<diag::kind>(0); 828 if (T->isReferenceType()) 829 err = diag::err_mutable_reference; 830 else if (T.isConstQualified()) 831 err = diag::err_mutable_const; 832 if (err != 0) { 833 if (DS.getStorageClassSpecLoc().isValid()) 834 Diag(DS.getStorageClassSpecLoc(), err); 835 else 836 Diag(DS.getThreadSpecLoc(), err); 837 // FIXME: It would be nicer if the keyword was ignored only for this 838 // declarator. Otherwise we could get follow-up errors. 839 D.getMutableDeclSpec().ClearStorageClassSpecs(); 840 } 841 } 842 break; 843 default: 844 if (DS.getStorageClassSpecLoc().isValid()) 845 Diag(DS.getStorageClassSpecLoc(), 846 diag::err_storageclass_invalid_for_member); 847 else 848 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 849 D.getMutableDeclSpec().ClearStorageClassSpecs(); 850 } 851 852 if (!isFunc && 853 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 854 D.getNumTypeObjects() == 0) { 855 // Check also for this case: 856 // 857 // typedef int f(); 858 // f a; 859 // 860 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 861 isFunc = TDType->isFunctionType(); 862 } 863 864 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 865 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 866 !isFunc); 867 868 Decl *Member; 869 if (isInstField) { 870 // FIXME: Check for template parameters! 871 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 872 AS); 873 assert(Member && "HandleField never returns null"); 874 } else { 875 Member = HandleDeclarator(S, D, move(TemplateParameterLists), false) 876 .getAs<Decl>(); 877 if (!Member) { 878 if (BitWidth) DeleteExpr(BitWidth); 879 return DeclPtrTy(); 880 } 881 882 // Non-instance-fields can't have a bitfield. 883 if (BitWidth) { 884 if (Member->isInvalidDecl()) { 885 // don't emit another diagnostic. 886 } else if (isa<VarDecl>(Member)) { 887 // C++ 9.6p3: A bit-field shall not be a static member. 888 // "static member 'A' cannot be a bit-field" 889 Diag(Loc, diag::err_static_not_bitfield) 890 << Name << BitWidth->getSourceRange(); 891 } else if (isa<TypedefDecl>(Member)) { 892 // "typedef member 'x' cannot be a bit-field" 893 Diag(Loc, diag::err_typedef_not_bitfield) 894 << Name << BitWidth->getSourceRange(); 895 } else { 896 // A function typedef ("typedef int f(); f a;"). 897 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 898 Diag(Loc, diag::err_not_integral_type_bitfield) 899 << Name << cast<ValueDecl>(Member)->getType() 900 << BitWidth->getSourceRange(); 901 } 902 903 DeleteExpr(BitWidth); 904 BitWidth = 0; 905 Member->setInvalidDecl(); 906 } 907 908 Member->setAccess(AS); 909 910 // If we have declared a member function template, set the access of the 911 // templated declaration as well. 912 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 913 FunTmpl->getTemplatedDecl()->setAccess(AS); 914 } 915 916 assert((Name || isInstField) && "No identifier for non-field ?"); 917 918 if (Init) 919 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 920 if (Deleted) // FIXME: Source location is not very good. 921 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 922 923 if (isInstField) { 924 FieldCollector->Add(cast<FieldDecl>(Member)); 925 return DeclPtrTy(); 926 } 927 return DeclPtrTy::make(Member); 928} 929 930/// ActOnMemInitializer - Handle a C++ member initializer. 931Sema::MemInitResult 932Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 933 Scope *S, 934 const CXXScopeSpec &SS, 935 IdentifierInfo *MemberOrBase, 936 TypeTy *TemplateTypeTy, 937 SourceLocation IdLoc, 938 SourceLocation LParenLoc, 939 ExprTy **Args, unsigned NumArgs, 940 SourceLocation *CommaLocs, 941 SourceLocation RParenLoc) { 942 if (!ConstructorD) 943 return true; 944 945 AdjustDeclIfTemplate(ConstructorD); 946 947 CXXConstructorDecl *Constructor 948 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 949 if (!Constructor) { 950 // The user wrote a constructor initializer on a function that is 951 // not a C++ constructor. Ignore the error for now, because we may 952 // have more member initializers coming; we'll diagnose it just 953 // once in ActOnMemInitializers. 954 return true; 955 } 956 957 CXXRecordDecl *ClassDecl = Constructor->getParent(); 958 959 // C++ [class.base.init]p2: 960 // Names in a mem-initializer-id are looked up in the scope of the 961 // constructor’s class and, if not found in that scope, are looked 962 // up in the scope containing the constructor’s 963 // definition. [Note: if the constructor’s class contains a member 964 // with the same name as a direct or virtual base class of the 965 // class, a mem-initializer-id naming the member or base class and 966 // composed of a single identifier refers to the class member. A 967 // mem-initializer-id for the hidden base class may be specified 968 // using a qualified name. ] 969 if (!SS.getScopeRep() && !TemplateTypeTy) { 970 // Look for a member, first. 971 FieldDecl *Member = 0; 972 DeclContext::lookup_result Result 973 = ClassDecl->lookup(MemberOrBase); 974 if (Result.first != Result.second) 975 Member = dyn_cast<FieldDecl>(*Result.first); 976 977 // FIXME: Handle members of an anonymous union. 978 979 if (Member) 980 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 981 RParenLoc); 982 } 983 // It didn't name a member, so see if it names a class. 984 TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy 985 : getTypeName(*MemberOrBase, IdLoc, S, &SS); 986 if (!BaseTy) 987 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 988 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 989 990 QualType BaseType = GetTypeFromParser(BaseTy); 991 992 return BuildBaseInitializer(BaseType, (Expr **)Args, NumArgs, IdLoc, 993 RParenLoc, ClassDecl); 994} 995 996/// Checks an initializer expression for use of uninitialized fields, such as 997/// containing the field that is being initialized. Returns true if there is an 998/// uninitialized field was used an updates the SourceLocation parameter; false 999/// otherwise. 1000static bool InitExprContainsUninitializedFields(const Stmt* S, 1001 const FieldDecl* LhsField, 1002 SourceLocation* L) { 1003 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1004 if (ME) { 1005 const NamedDecl* RhsField = ME->getMemberDecl(); 1006 if (RhsField == LhsField) { 1007 // Initializing a field with itself. Throw a warning. 1008 // But wait; there are exceptions! 1009 // Exception #1: The field may not belong to this record. 1010 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1011 const Expr* base = ME->getBase(); 1012 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1013 // Even though the field matches, it does not belong to this record. 1014 return false; 1015 } 1016 // None of the exceptions triggered; return true to indicate an 1017 // uninitialized field was used. 1018 *L = ME->getMemberLoc(); 1019 return true; 1020 } 1021 } 1022 bool found = false; 1023 for (Stmt::const_child_iterator it = S->child_begin(); 1024 it != S->child_end() && found == false; 1025 ++it) { 1026 if (isa<CallExpr>(S)) { 1027 // Do not descend into function calls or constructors, as the use 1028 // of an uninitialized field may be valid. One would have to inspect 1029 // the contents of the function/ctor to determine if it is safe or not. 1030 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1031 // may be safe, depending on what the function/ctor does. 1032 continue; 1033 } 1034 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1035 } 1036 return found; 1037} 1038 1039Sema::MemInitResult 1040Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1041 unsigned NumArgs, SourceLocation IdLoc, 1042 SourceLocation RParenLoc) { 1043 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1044 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1045 ExprTemporaries.clear(); 1046 1047 // Diagnose value-uses of fields to initialize themselves, e.g. 1048 // foo(foo) 1049 // where foo is not also a parameter to the constructor. 1050 // TODO: implement -Wuninitialized and fold this into that framework. 1051 for (unsigned i = 0; i < NumArgs; ++i) { 1052 SourceLocation L; 1053 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1054 // FIXME: Return true in the case when other fields are used before being 1055 // uninitialized. For example, let this field be the i'th field. When 1056 // initializing the i'th field, throw a warning if any of the >= i'th 1057 // fields are used, as they are not yet initialized. 1058 // Right now we are only handling the case where the i'th field uses 1059 // itself in its initializer. 1060 Diag(L, diag::warn_field_is_uninit); 1061 } 1062 } 1063 1064 bool HasDependentArg = false; 1065 for (unsigned i = 0; i < NumArgs; i++) 1066 HasDependentArg |= Args[i]->isTypeDependent(); 1067 1068 CXXConstructorDecl *C = 0; 1069 QualType FieldType = Member->getType(); 1070 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1071 FieldType = Array->getElementType(); 1072 if (FieldType->isDependentType()) { 1073 // Can't check init for dependent type. 1074 } else if (FieldType->isRecordType()) { 1075 // Member is a record (struct/union/class), so pass the initializer 1076 // arguments down to the record's constructor. 1077 if (!HasDependentArg) { 1078 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1079 1080 C = PerformInitializationByConstructor(FieldType, 1081 MultiExprArg(*this, 1082 (void**)Args, 1083 NumArgs), 1084 IdLoc, 1085 SourceRange(IdLoc, RParenLoc), 1086 Member->getDeclName(), IK_Direct, 1087 ConstructorArgs); 1088 1089 if (C) { 1090 // Take over the constructor arguments as our own. 1091 NumArgs = ConstructorArgs.size(); 1092 Args = (Expr **)ConstructorArgs.take(); 1093 } 1094 } 1095 } else if (NumArgs != 1 && NumArgs != 0) { 1096 // The member type is not a record type (or an array of record 1097 // types), so it can be only be default- or copy-initialized. 1098 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 1099 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 1100 } else if (!HasDependentArg) { 1101 Expr *NewExp; 1102 if (NumArgs == 0) { 1103 if (FieldType->isReferenceType()) { 1104 Diag(IdLoc, diag::err_null_intialized_reference_member) 1105 << Member->getDeclName(); 1106 return Diag(Member->getLocation(), diag::note_declared_at); 1107 } 1108 NewExp = new (Context) CXXZeroInitValueExpr(FieldType, IdLoc, RParenLoc); 1109 NumArgs = 1; 1110 } 1111 else 1112 NewExp = (Expr*)Args[0]; 1113 if (PerformCopyInitialization(NewExp, FieldType, "passing")) 1114 return true; 1115 Args[0] = NewExp; 1116 } 1117 1118 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1119 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1120 ExprTemporaries.clear(); 1121 1122 // FIXME: Perform direct initialization of the member. 1123 return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args, 1124 NumArgs, C, IdLoc, RParenLoc); 1125} 1126 1127Sema::MemInitResult 1128Sema::BuildBaseInitializer(QualType BaseType, Expr **Args, 1129 unsigned NumArgs, SourceLocation IdLoc, 1130 SourceLocation RParenLoc, CXXRecordDecl *ClassDecl) { 1131 bool HasDependentArg = false; 1132 for (unsigned i = 0; i < NumArgs; i++) 1133 HasDependentArg |= Args[i]->isTypeDependent(); 1134 1135 if (!BaseType->isDependentType()) { 1136 if (!BaseType->isRecordType()) 1137 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 1138 << BaseType << SourceRange(IdLoc, RParenLoc); 1139 1140 // C++ [class.base.init]p2: 1141 // [...] Unless the mem-initializer-id names a nonstatic data 1142 // member of the constructor’s class or a direct or virtual base 1143 // of that class, the mem-initializer is ill-formed. A 1144 // mem-initializer-list can initialize a base class using any 1145 // name that denotes that base class type. 1146 1147 // First, check for a direct base class. 1148 const CXXBaseSpecifier *DirectBaseSpec = 0; 1149 for (CXXRecordDecl::base_class_const_iterator Base = 1150 ClassDecl->bases_begin(); Base != ClassDecl->bases_end(); ++Base) { 1151 if (Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1152 // We found a direct base of this type. That's what we're 1153 // initializing. 1154 DirectBaseSpec = &*Base; 1155 break; 1156 } 1157 } 1158 1159 // Check for a virtual base class. 1160 // FIXME: We might be able to short-circuit this if we know in advance that 1161 // there are no virtual bases. 1162 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1163 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1164 // We haven't found a base yet; search the class hierarchy for a 1165 // virtual base class. 1166 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1167 /*DetectVirtual=*/false); 1168 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 1169 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1170 Path != Paths.end(); ++Path) { 1171 if (Path->back().Base->isVirtual()) { 1172 VirtualBaseSpec = Path->back().Base; 1173 break; 1174 } 1175 } 1176 } 1177 } 1178 1179 // C++ [base.class.init]p2: 1180 // If a mem-initializer-id is ambiguous because it designates both 1181 // a direct non-virtual base class and an inherited virtual base 1182 // class, the mem-initializer is ill-formed. 1183 if (DirectBaseSpec && VirtualBaseSpec) 1184 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 1185 << BaseType << SourceRange(IdLoc, RParenLoc); 1186 // C++ [base.class.init]p2: 1187 // Unless the mem-initializer-id names a nonstatic data membeer of the 1188 // constructor's class ot a direst or virtual base of that class, the 1189 // mem-initializer is ill-formed. 1190 if (!DirectBaseSpec && !VirtualBaseSpec) 1191 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 1192 << BaseType << ClassDecl->getNameAsCString() 1193 << SourceRange(IdLoc, RParenLoc); 1194 } 1195 1196 CXXConstructorDecl *C = 0; 1197 if (!BaseType->isDependentType() && !HasDependentArg) { 1198 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 1199 Context.getCanonicalType(BaseType).getUnqualifiedType()); 1200 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1201 1202 C = PerformInitializationByConstructor(BaseType, 1203 MultiExprArg(*this, 1204 (void**)Args, NumArgs), 1205 IdLoc, SourceRange(IdLoc, RParenLoc), 1206 Name, IK_Direct, 1207 ConstructorArgs); 1208 if (C) { 1209 // Take over the constructor arguments as our own. 1210 NumArgs = ConstructorArgs.size(); 1211 Args = (Expr **)ConstructorArgs.take(); 1212 } 1213 } 1214 1215 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1216 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1217 ExprTemporaries.clear(); 1218 1219 return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, 1220 NumArgs, C, IdLoc, RParenLoc); 1221} 1222 1223bool 1224Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1225 CXXBaseOrMemberInitializer **Initializers, 1226 unsigned NumInitializers, 1227 bool IsImplicitConstructor) { 1228 // We need to build the initializer AST according to order of construction 1229 // and not what user specified in the Initializers list. 1230 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1231 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1232 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1233 bool HasDependentBaseInit = false; 1234 bool HadError = false; 1235 1236 for (unsigned i = 0; i < NumInitializers; i++) { 1237 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1238 if (Member->isBaseInitializer()) { 1239 if (Member->getBaseClass()->isDependentType()) 1240 HasDependentBaseInit = true; 1241 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1242 } else { 1243 AllBaseFields[Member->getMember()] = Member; 1244 } 1245 } 1246 1247 if (HasDependentBaseInit) { 1248 // FIXME. This does not preserve the ordering of the initializers. 1249 // Try (with -Wreorder) 1250 // template<class X> struct A {}; 1251 // template<class X> struct B : A<X> { 1252 // B() : x1(10), A<X>() {} 1253 // int x1; 1254 // }; 1255 // B<int> x; 1256 // On seeing one dependent type, we should essentially exit this routine 1257 // while preserving user-declared initializer list. When this routine is 1258 // called during instantiatiation process, this routine will rebuild the 1259 // ordered initializer list correctly. 1260 1261 // If we have a dependent base initialization, we can't determine the 1262 // association between initializers and bases; just dump the known 1263 // initializers into the list, and don't try to deal with other bases. 1264 for (unsigned i = 0; i < NumInitializers; i++) { 1265 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1266 if (Member->isBaseInitializer()) 1267 AllToInit.push_back(Member); 1268 } 1269 } else { 1270 // Push virtual bases before others. 1271 for (CXXRecordDecl::base_class_iterator VBase = 1272 ClassDecl->vbases_begin(), 1273 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1274 if (VBase->getType()->isDependentType()) 1275 continue; 1276 if (CXXBaseOrMemberInitializer *Value 1277 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1278 AllToInit.push_back(Value); 1279 } 1280 else { 1281 CXXRecordDecl *VBaseDecl = 1282 cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1283 assert(VBaseDecl && "SetBaseOrMemberInitializers - VBaseDecl null"); 1284 CXXConstructorDecl *Ctor = VBaseDecl->getDefaultConstructor(Context); 1285 if (!Ctor) { 1286 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1287 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1288 << 0 << VBase->getType(); 1289 Diag(VBaseDecl->getLocation(), diag::note_previous_class_decl) 1290 << Context.getTagDeclType(VBaseDecl); 1291 HadError = true; 1292 continue; 1293 } 1294 1295 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1296 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1297 Constructor->getLocation(), CtorArgs)) 1298 continue; 1299 1300 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1301 1302 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1303 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1304 ExprTemporaries.clear(); 1305 CXXBaseOrMemberInitializer *Member = 1306 new (Context) CXXBaseOrMemberInitializer(VBase->getType(), 1307 CtorArgs.takeAs<Expr>(), 1308 CtorArgs.size(), Ctor, 1309 SourceLocation(), 1310 SourceLocation()); 1311 AllToInit.push_back(Member); 1312 } 1313 } 1314 1315 for (CXXRecordDecl::base_class_iterator Base = 1316 ClassDecl->bases_begin(), 1317 E = ClassDecl->bases_end(); Base != E; ++Base) { 1318 // Virtuals are in the virtual base list and already constructed. 1319 if (Base->isVirtual()) 1320 continue; 1321 // Skip dependent types. 1322 if (Base->getType()->isDependentType()) 1323 continue; 1324 if (CXXBaseOrMemberInitializer *Value 1325 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1326 AllToInit.push_back(Value); 1327 } 1328 else { 1329 CXXRecordDecl *BaseDecl = 1330 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1331 assert(BaseDecl && "SetBaseOrMemberInitializers - BaseDecl null"); 1332 CXXConstructorDecl *Ctor = BaseDecl->getDefaultConstructor(Context); 1333 if (!Ctor) { 1334 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1335 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1336 << 0 << Base->getType(); 1337 Diag(BaseDecl->getLocation(), diag::note_previous_class_decl) 1338 << Context.getTagDeclType(BaseDecl); 1339 HadError = true; 1340 continue; 1341 } 1342 1343 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1344 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1345 Constructor->getLocation(), CtorArgs)) 1346 continue; 1347 1348 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1349 1350 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1351 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1352 ExprTemporaries.clear(); 1353 CXXBaseOrMemberInitializer *Member = 1354 new (Context) CXXBaseOrMemberInitializer(Base->getType(), 1355 CtorArgs.takeAs<Expr>(), 1356 CtorArgs.size(), Ctor, 1357 SourceLocation(), 1358 SourceLocation()); 1359 AllToInit.push_back(Member); 1360 } 1361 } 1362 } 1363 1364 // non-static data members. 1365 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1366 E = ClassDecl->field_end(); Field != E; ++Field) { 1367 if ((*Field)->isAnonymousStructOrUnion()) { 1368 if (const RecordType *FieldClassType = 1369 Field->getType()->getAs<RecordType>()) { 1370 CXXRecordDecl *FieldClassDecl 1371 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1372 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1373 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1374 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1375 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1376 // set to the anonymous union data member used in the initializer 1377 // list. 1378 Value->setMember(*Field); 1379 Value->setAnonUnionMember(*FA); 1380 AllToInit.push_back(Value); 1381 break; 1382 } 1383 } 1384 } 1385 continue; 1386 } 1387 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1388 AllToInit.push_back(Value); 1389 continue; 1390 } 1391 1392 if ((*Field)->getType()->isDependentType()) 1393 continue; 1394 1395 QualType FT = Context.getBaseElementType((*Field)->getType()); 1396 if (const RecordType* RT = FT->getAs<RecordType>()) { 1397 CXXConstructorDecl *Ctor = 1398 cast<CXXRecordDecl>(RT->getDecl())->getDefaultConstructor(Context); 1399 if (!Ctor) { 1400 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1401 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1402 << 1 << (*Field)->getDeclName(); 1403 Diag(Field->getLocation(), diag::note_field_decl); 1404 Diag(RT->getDecl()->getLocation(), diag::note_previous_class_decl) 1405 << Context.getTagDeclType(RT->getDecl()); 1406 HadError = true; 1407 continue; 1408 } 1409 1410 if (FT.isConstQualified() && Ctor->isTrivial()) { 1411 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1412 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1413 << 1 << (*Field)->getDeclName(); 1414 Diag((*Field)->getLocation(), diag::note_declared_at); 1415 HadError = true; 1416 } 1417 1418 // Don't create initializers for trivial constructors, since they don't 1419 // actually need to be run. 1420 if (Ctor->isTrivial()) 1421 continue; 1422 1423 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1424 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1425 Constructor->getLocation(), CtorArgs)) 1426 continue; 1427 1428 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1429 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1430 ExprTemporaries.clear(); 1431 CXXBaseOrMemberInitializer *Member = 1432 new (Context) CXXBaseOrMemberInitializer(*Field,CtorArgs.takeAs<Expr>(), 1433 CtorArgs.size(), Ctor, 1434 SourceLocation(), 1435 SourceLocation()); 1436 1437 AllToInit.push_back(Member); 1438 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1439 } 1440 else if (FT->isReferenceType()) { 1441 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1442 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1443 << 0 << (*Field)->getDeclName(); 1444 Diag((*Field)->getLocation(), diag::note_declared_at); 1445 HadError = true; 1446 } 1447 else if (FT.isConstQualified()) { 1448 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1449 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1450 << 1 << (*Field)->getDeclName(); 1451 Diag((*Field)->getLocation(), diag::note_declared_at); 1452 HadError = true; 1453 } 1454 } 1455 1456 NumInitializers = AllToInit.size(); 1457 if (NumInitializers > 0) { 1458 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1459 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1460 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1461 1462 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1463 for (unsigned Idx = 0; Idx < NumInitializers; ++Idx) 1464 baseOrMemberInitializers[Idx] = AllToInit[Idx]; 1465 } 1466 1467 return HadError; 1468} 1469 1470static void *GetKeyForTopLevelField(FieldDecl *Field) { 1471 // For anonymous unions, use the class declaration as the key. 1472 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1473 if (RT->getDecl()->isAnonymousStructOrUnion()) 1474 return static_cast<void *>(RT->getDecl()); 1475 } 1476 return static_cast<void *>(Field); 1477} 1478 1479static void *GetKeyForBase(QualType BaseType) { 1480 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1481 return (void *)RT; 1482 1483 assert(0 && "Unexpected base type!"); 1484 return 0; 1485} 1486 1487static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1488 bool MemberMaybeAnon = false) { 1489 // For fields injected into the class via declaration of an anonymous union, 1490 // use its anonymous union class declaration as the unique key. 1491 if (Member->isMemberInitializer()) { 1492 FieldDecl *Field = Member->getMember(); 1493 1494 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1495 // data member of the class. Data member used in the initializer list is 1496 // in AnonUnionMember field. 1497 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1498 Field = Member->getAnonUnionMember(); 1499 if (Field->getDeclContext()->isRecord()) { 1500 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 1501 if (RD->isAnonymousStructOrUnion()) 1502 return static_cast<void *>(RD); 1503 } 1504 return static_cast<void *>(Field); 1505 } 1506 1507 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1508} 1509 1510/// ActOnMemInitializers - Handle the member initializers for a constructor. 1511void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1512 SourceLocation ColonLoc, 1513 MemInitTy **MemInits, unsigned NumMemInits) { 1514 if (!ConstructorDecl) 1515 return; 1516 1517 AdjustDeclIfTemplate(ConstructorDecl); 1518 1519 CXXConstructorDecl *Constructor 1520 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1521 1522 if (!Constructor) { 1523 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1524 return; 1525 } 1526 1527 if (!Constructor->isDependentContext()) { 1528 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 1529 bool err = false; 1530 for (unsigned i = 0; i < NumMemInits; i++) { 1531 CXXBaseOrMemberInitializer *Member = 1532 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1533 void *KeyToMember = GetKeyForMember(Member); 1534 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1535 if (!PrevMember) { 1536 PrevMember = Member; 1537 continue; 1538 } 1539 if (FieldDecl *Field = Member->getMember()) 1540 Diag(Member->getSourceLocation(), 1541 diag::error_multiple_mem_initialization) 1542 << Field->getNameAsString(); 1543 else { 1544 Type *BaseClass = Member->getBaseClass(); 1545 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1546 Diag(Member->getSourceLocation(), 1547 diag::error_multiple_base_initialization) 1548 << QualType(BaseClass, 0); 1549 } 1550 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1551 << 0; 1552 err = true; 1553 } 1554 1555 if (err) 1556 return; 1557 } 1558 1559 SetBaseOrMemberInitializers(Constructor, 1560 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 1561 NumMemInits, false); 1562 1563 if (Constructor->isDependentContext()) 1564 return; 1565 1566 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1567 Diagnostic::Ignored && 1568 Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1569 Diagnostic::Ignored) 1570 return; 1571 1572 // Also issue warning if order of ctor-initializer list does not match order 1573 // of 1) base class declarations and 2) order of non-static data members. 1574 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1575 1576 CXXRecordDecl *ClassDecl 1577 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1578 // Push virtual bases before others. 1579 for (CXXRecordDecl::base_class_iterator VBase = 1580 ClassDecl->vbases_begin(), 1581 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1582 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1583 1584 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1585 E = ClassDecl->bases_end(); Base != E; ++Base) { 1586 // Virtuals are alread in the virtual base list and are constructed 1587 // first. 1588 if (Base->isVirtual()) 1589 continue; 1590 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1591 } 1592 1593 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1594 E = ClassDecl->field_end(); Field != E; ++Field) 1595 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1596 1597 int Last = AllBaseOrMembers.size(); 1598 int curIndex = 0; 1599 CXXBaseOrMemberInitializer *PrevMember = 0; 1600 for (unsigned i = 0; i < NumMemInits; i++) { 1601 CXXBaseOrMemberInitializer *Member = 1602 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1603 void *MemberInCtorList = GetKeyForMember(Member, true); 1604 1605 for (; curIndex < Last; curIndex++) 1606 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1607 break; 1608 if (curIndex == Last) { 1609 assert(PrevMember && "Member not in member list?!"); 1610 // Initializer as specified in ctor-initializer list is out of order. 1611 // Issue a warning diagnostic. 1612 if (PrevMember->isBaseInitializer()) { 1613 // Diagnostics is for an initialized base class. 1614 Type *BaseClass = PrevMember->getBaseClass(); 1615 Diag(PrevMember->getSourceLocation(), 1616 diag::warn_base_initialized) 1617 << QualType(BaseClass, 0); 1618 } else { 1619 FieldDecl *Field = PrevMember->getMember(); 1620 Diag(PrevMember->getSourceLocation(), 1621 diag::warn_field_initialized) 1622 << Field->getNameAsString(); 1623 } 1624 // Also the note! 1625 if (FieldDecl *Field = Member->getMember()) 1626 Diag(Member->getSourceLocation(), 1627 diag::note_fieldorbase_initialized_here) << 0 1628 << Field->getNameAsString(); 1629 else { 1630 Type *BaseClass = Member->getBaseClass(); 1631 Diag(Member->getSourceLocation(), 1632 diag::note_fieldorbase_initialized_here) << 1 1633 << QualType(BaseClass, 0); 1634 } 1635 for (curIndex = 0; curIndex < Last; curIndex++) 1636 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1637 break; 1638 } 1639 PrevMember = Member; 1640 } 1641} 1642 1643void 1644Sema::MarkBaseAndMemberDestructorsReferenced(CXXDestructorDecl *Destructor) { 1645 // Ignore dependent destructors. 1646 if (Destructor->isDependentContext()) 1647 return; 1648 1649 CXXRecordDecl *ClassDecl = Destructor->getParent(); 1650 1651 // Non-static data members. 1652 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1653 E = ClassDecl->field_end(); I != E; ++I) { 1654 FieldDecl *Field = *I; 1655 1656 QualType FieldType = Context.getBaseElementType(Field->getType()); 1657 1658 const RecordType* RT = FieldType->getAs<RecordType>(); 1659 if (!RT) 1660 continue; 1661 1662 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1663 if (FieldClassDecl->hasTrivialDestructor()) 1664 continue; 1665 1666 const CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1667 MarkDeclarationReferenced(Destructor->getLocation(), 1668 const_cast<CXXDestructorDecl*>(Dtor)); 1669 } 1670 1671 // Bases. 1672 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1673 E = ClassDecl->bases_end(); Base != E; ++Base) { 1674 // Ignore virtual bases. 1675 if (Base->isVirtual()) 1676 continue; 1677 1678 // Ignore trivial destructors. 1679 CXXRecordDecl *BaseClassDecl 1680 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1681 if (BaseClassDecl->hasTrivialDestructor()) 1682 continue; 1683 1684 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1685 MarkDeclarationReferenced(Destructor->getLocation(), 1686 const_cast<CXXDestructorDecl*>(Dtor)); 1687 } 1688 1689 // Virtual bases. 1690 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1691 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1692 // Ignore trivial destructors. 1693 CXXRecordDecl *BaseClassDecl 1694 = cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1695 if (BaseClassDecl->hasTrivialDestructor()) 1696 continue; 1697 1698 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1699 MarkDeclarationReferenced(Destructor->getLocation(), 1700 const_cast<CXXDestructorDecl*>(Dtor)); 1701 } 1702} 1703 1704void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1705 if (!CDtorDecl) 1706 return; 1707 1708 AdjustDeclIfTemplate(CDtorDecl); 1709 1710 if (CXXConstructorDecl *Constructor 1711 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1712 SetBaseOrMemberInitializers(Constructor, 0, 0, false); 1713} 1714 1715namespace { 1716 /// PureVirtualMethodCollector - traverses a class and its superclasses 1717 /// and determines if it has any pure virtual methods. 1718 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 1719 ASTContext &Context; 1720 1721 public: 1722 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1723 1724 private: 1725 MethodList Methods; 1726 1727 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1728 1729 public: 1730 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1731 : Context(Ctx) { 1732 1733 MethodList List; 1734 Collect(RD, List); 1735 1736 // Copy the temporary list to methods, and make sure to ignore any 1737 // null entries. 1738 for (size_t i = 0, e = List.size(); i != e; ++i) { 1739 if (List[i]) 1740 Methods.push_back(List[i]); 1741 } 1742 } 1743 1744 bool empty() const { return Methods.empty(); } 1745 1746 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1747 MethodList::const_iterator methods_end() { return Methods.end(); } 1748 }; 1749 1750 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1751 MethodList& Methods) { 1752 // First, collect the pure virtual methods for the base classes. 1753 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1754 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1755 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1756 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1757 if (BaseDecl && BaseDecl->isAbstract()) 1758 Collect(BaseDecl, Methods); 1759 } 1760 } 1761 1762 // Next, zero out any pure virtual methods that this class overrides. 1763 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1764 1765 MethodSetTy OverriddenMethods; 1766 size_t MethodsSize = Methods.size(); 1767 1768 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1769 i != e; ++i) { 1770 // Traverse the record, looking for methods. 1771 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1772 // If the method is pure virtual, add it to the methods vector. 1773 if (MD->isPure()) 1774 Methods.push_back(MD); 1775 1776 // Record all the overridden methods in our set. 1777 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1778 E = MD->end_overridden_methods(); I != E; ++I) { 1779 // Keep track of the overridden methods. 1780 OverriddenMethods.insert(*I); 1781 } 1782 } 1783 } 1784 1785 // Now go through the methods and zero out all the ones we know are 1786 // overridden. 1787 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1788 if (OverriddenMethods.count(Methods[i])) 1789 Methods[i] = 0; 1790 } 1791 1792 } 1793} 1794 1795 1796bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1797 unsigned DiagID, AbstractDiagSelID SelID, 1798 const CXXRecordDecl *CurrentRD) { 1799 if (SelID == -1) 1800 return RequireNonAbstractType(Loc, T, 1801 PDiag(DiagID), CurrentRD); 1802 else 1803 return RequireNonAbstractType(Loc, T, 1804 PDiag(DiagID) << SelID, CurrentRD); 1805} 1806 1807bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1808 const PartialDiagnostic &PD, 1809 const CXXRecordDecl *CurrentRD) { 1810 if (!getLangOptions().CPlusPlus) 1811 return false; 1812 1813 if (const ArrayType *AT = Context.getAsArrayType(T)) 1814 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 1815 CurrentRD); 1816 1817 if (const PointerType *PT = T->getAs<PointerType>()) { 1818 // Find the innermost pointer type. 1819 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1820 PT = T; 1821 1822 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1823 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 1824 } 1825 1826 const RecordType *RT = T->getAs<RecordType>(); 1827 if (!RT) 1828 return false; 1829 1830 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1831 if (!RD) 1832 return false; 1833 1834 if (CurrentRD && CurrentRD != RD) 1835 return false; 1836 1837 if (!RD->isAbstract()) 1838 return false; 1839 1840 Diag(Loc, PD) << RD->getDeclName(); 1841 1842 // Check if we've already emitted the list of pure virtual functions for this 1843 // class. 1844 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1845 return true; 1846 1847 PureVirtualMethodCollector Collector(Context, RD); 1848 1849 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1850 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1851 const CXXMethodDecl *MD = *I; 1852 1853 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1854 MD->getDeclName(); 1855 } 1856 1857 if (!PureVirtualClassDiagSet) 1858 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1859 PureVirtualClassDiagSet->insert(RD); 1860 1861 return true; 1862} 1863 1864namespace { 1865 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1866 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1867 Sema &SemaRef; 1868 CXXRecordDecl *AbstractClass; 1869 1870 bool VisitDeclContext(const DeclContext *DC) { 1871 bool Invalid = false; 1872 1873 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1874 E = DC->decls_end(); I != E; ++I) 1875 Invalid |= Visit(*I); 1876 1877 return Invalid; 1878 } 1879 1880 public: 1881 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1882 : SemaRef(SemaRef), AbstractClass(ac) { 1883 Visit(SemaRef.Context.getTranslationUnitDecl()); 1884 } 1885 1886 bool VisitFunctionDecl(const FunctionDecl *FD) { 1887 if (FD->isThisDeclarationADefinition()) { 1888 // No need to do the check if we're in a definition, because it requires 1889 // that the return/param types are complete. 1890 // because that requires 1891 return VisitDeclContext(FD); 1892 } 1893 1894 // Check the return type. 1895 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 1896 bool Invalid = 1897 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1898 diag::err_abstract_type_in_decl, 1899 Sema::AbstractReturnType, 1900 AbstractClass); 1901 1902 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1903 E = FD->param_end(); I != E; ++I) { 1904 const ParmVarDecl *VD = *I; 1905 Invalid |= 1906 SemaRef.RequireNonAbstractType(VD->getLocation(), 1907 VD->getOriginalType(), 1908 diag::err_abstract_type_in_decl, 1909 Sema::AbstractParamType, 1910 AbstractClass); 1911 } 1912 1913 return Invalid; 1914 } 1915 1916 bool VisitDecl(const Decl* D) { 1917 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1918 return VisitDeclContext(DC); 1919 1920 return false; 1921 } 1922 }; 1923} 1924 1925void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1926 DeclPtrTy TagDecl, 1927 SourceLocation LBrac, 1928 SourceLocation RBrac) { 1929 if (!TagDecl) 1930 return; 1931 1932 AdjustDeclIfTemplate(TagDecl); 1933 ActOnFields(S, RLoc, TagDecl, 1934 (DeclPtrTy*)FieldCollector->getCurFields(), 1935 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1936 1937 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1938 if (!RD->isAbstract()) { 1939 // Collect all the pure virtual methods and see if this is an abstract 1940 // class after all. 1941 PureVirtualMethodCollector Collector(Context, RD); 1942 if (!Collector.empty()) 1943 RD->setAbstract(true); 1944 } 1945 1946 if (RD->isAbstract()) 1947 (void)AbstractClassUsageDiagnoser(*this, RD); 1948 1949 if (!RD->isDependentType() && !RD->isInvalidDecl()) 1950 AddImplicitlyDeclaredMembersToClass(RD); 1951} 1952 1953/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1954/// special functions, such as the default constructor, copy 1955/// constructor, or destructor, to the given C++ class (C++ 1956/// [special]p1). This routine can only be executed just before the 1957/// definition of the class is complete. 1958void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1959 CanQualType ClassType 1960 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1961 1962 // FIXME: Implicit declarations have exception specifications, which are 1963 // the union of the specifications of the implicitly called functions. 1964 1965 if (!ClassDecl->hasUserDeclaredConstructor()) { 1966 // C++ [class.ctor]p5: 1967 // A default constructor for a class X is a constructor of class X 1968 // that can be called without an argument. If there is no 1969 // user-declared constructor for class X, a default constructor is 1970 // implicitly declared. An implicitly-declared default constructor 1971 // is an inline public member of its class. 1972 DeclarationName Name 1973 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1974 CXXConstructorDecl *DefaultCon = 1975 CXXConstructorDecl::Create(Context, ClassDecl, 1976 ClassDecl->getLocation(), Name, 1977 Context.getFunctionType(Context.VoidTy, 1978 0, 0, false, 0), 1979 /*DInfo=*/0, 1980 /*isExplicit=*/false, 1981 /*isInline=*/true, 1982 /*isImplicitlyDeclared=*/true); 1983 DefaultCon->setAccess(AS_public); 1984 DefaultCon->setImplicit(); 1985 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 1986 ClassDecl->addDecl(DefaultCon); 1987 } 1988 1989 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1990 // C++ [class.copy]p4: 1991 // If the class definition does not explicitly declare a copy 1992 // constructor, one is declared implicitly. 1993 1994 // C++ [class.copy]p5: 1995 // The implicitly-declared copy constructor for a class X will 1996 // have the form 1997 // 1998 // X::X(const X&) 1999 // 2000 // if 2001 bool HasConstCopyConstructor = true; 2002 2003 // -- each direct or virtual base class B of X has a copy 2004 // constructor whose first parameter is of type const B& or 2005 // const volatile B&, and 2006 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2007 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2008 const CXXRecordDecl *BaseClassDecl 2009 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2010 HasConstCopyConstructor 2011 = BaseClassDecl->hasConstCopyConstructor(Context); 2012 } 2013 2014 // -- for all the nonstatic data members of X that are of a 2015 // class type M (or array thereof), each such class type 2016 // has a copy constructor whose first parameter is of type 2017 // const M& or const volatile M&. 2018 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2019 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2020 ++Field) { 2021 QualType FieldType = (*Field)->getType(); 2022 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2023 FieldType = Array->getElementType(); 2024 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2025 const CXXRecordDecl *FieldClassDecl 2026 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2027 HasConstCopyConstructor 2028 = FieldClassDecl->hasConstCopyConstructor(Context); 2029 } 2030 } 2031 2032 // Otherwise, the implicitly declared copy constructor will have 2033 // the form 2034 // 2035 // X::X(X&) 2036 QualType ArgType = ClassType; 2037 if (HasConstCopyConstructor) 2038 ArgType = ArgType.withConst(); 2039 ArgType = Context.getLValueReferenceType(ArgType); 2040 2041 // An implicitly-declared copy constructor is an inline public 2042 // member of its class. 2043 DeclarationName Name 2044 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2045 CXXConstructorDecl *CopyConstructor 2046 = CXXConstructorDecl::Create(Context, ClassDecl, 2047 ClassDecl->getLocation(), Name, 2048 Context.getFunctionType(Context.VoidTy, 2049 &ArgType, 1, 2050 false, 0), 2051 /*DInfo=*/0, 2052 /*isExplicit=*/false, 2053 /*isInline=*/true, 2054 /*isImplicitlyDeclared=*/true); 2055 CopyConstructor->setAccess(AS_public); 2056 CopyConstructor->setImplicit(); 2057 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2058 2059 // Add the parameter to the constructor. 2060 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2061 ClassDecl->getLocation(), 2062 /*IdentifierInfo=*/0, 2063 ArgType, /*DInfo=*/0, 2064 VarDecl::None, 0); 2065 CopyConstructor->setParams(Context, &FromParam, 1); 2066 ClassDecl->addDecl(CopyConstructor); 2067 } 2068 2069 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2070 // Note: The following rules are largely analoguous to the copy 2071 // constructor rules. Note that virtual bases are not taken into account 2072 // for determining the argument type of the operator. Note also that 2073 // operators taking an object instead of a reference are allowed. 2074 // 2075 // C++ [class.copy]p10: 2076 // If the class definition does not explicitly declare a copy 2077 // assignment operator, one is declared implicitly. 2078 // The implicitly-defined copy assignment operator for a class X 2079 // will have the form 2080 // 2081 // X& X::operator=(const X&) 2082 // 2083 // if 2084 bool HasConstCopyAssignment = true; 2085 2086 // -- each direct base class B of X has a copy assignment operator 2087 // whose parameter is of type const B&, const volatile B& or B, 2088 // and 2089 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2090 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2091 assert(!Base->getType()->isDependentType() && 2092 "Cannot generate implicit members for class with dependent bases."); 2093 const CXXRecordDecl *BaseClassDecl 2094 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2095 const CXXMethodDecl *MD = 0; 2096 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2097 MD); 2098 } 2099 2100 // -- for all the nonstatic data members of X that are of a class 2101 // type M (or array thereof), each such class type has a copy 2102 // assignment operator whose parameter is of type const M&, 2103 // const volatile M& or M. 2104 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2105 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2106 ++Field) { 2107 QualType FieldType = (*Field)->getType(); 2108 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2109 FieldType = Array->getElementType(); 2110 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2111 const CXXRecordDecl *FieldClassDecl 2112 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2113 const CXXMethodDecl *MD = 0; 2114 HasConstCopyAssignment 2115 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2116 } 2117 } 2118 2119 // Otherwise, the implicitly declared copy assignment operator will 2120 // have the form 2121 // 2122 // X& X::operator=(X&) 2123 QualType ArgType = ClassType; 2124 QualType RetType = Context.getLValueReferenceType(ArgType); 2125 if (HasConstCopyAssignment) 2126 ArgType = ArgType.withConst(); 2127 ArgType = Context.getLValueReferenceType(ArgType); 2128 2129 // An implicitly-declared copy assignment operator is an inline public 2130 // member of its class. 2131 DeclarationName Name = 2132 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2133 CXXMethodDecl *CopyAssignment = 2134 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2135 Context.getFunctionType(RetType, &ArgType, 1, 2136 false, 0), 2137 /*DInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2138 CopyAssignment->setAccess(AS_public); 2139 CopyAssignment->setImplicit(); 2140 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2141 CopyAssignment->setCopyAssignment(true); 2142 2143 // Add the parameter to the operator. 2144 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2145 ClassDecl->getLocation(), 2146 /*IdentifierInfo=*/0, 2147 ArgType, /*DInfo=*/0, 2148 VarDecl::None, 0); 2149 CopyAssignment->setParams(Context, &FromParam, 1); 2150 2151 // Don't call addedAssignmentOperator. There is no way to distinguish an 2152 // implicit from an explicit assignment operator. 2153 ClassDecl->addDecl(CopyAssignment); 2154 } 2155 2156 if (!ClassDecl->hasUserDeclaredDestructor()) { 2157 // C++ [class.dtor]p2: 2158 // If a class has no user-declared destructor, a destructor is 2159 // declared implicitly. An implicitly-declared destructor is an 2160 // inline public member of its class. 2161 DeclarationName Name 2162 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2163 CXXDestructorDecl *Destructor 2164 = CXXDestructorDecl::Create(Context, ClassDecl, 2165 ClassDecl->getLocation(), Name, 2166 Context.getFunctionType(Context.VoidTy, 2167 0, 0, false, 0), 2168 /*isInline=*/true, 2169 /*isImplicitlyDeclared=*/true); 2170 Destructor->setAccess(AS_public); 2171 Destructor->setImplicit(); 2172 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2173 ClassDecl->addDecl(Destructor); 2174 } 2175} 2176 2177void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2178 Decl *D = TemplateD.getAs<Decl>(); 2179 if (!D) 2180 return; 2181 2182 TemplateParameterList *Params = 0; 2183 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2184 Params = Template->getTemplateParameters(); 2185 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2186 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2187 Params = PartialSpec->getTemplateParameters(); 2188 else 2189 return; 2190 2191 for (TemplateParameterList::iterator Param = Params->begin(), 2192 ParamEnd = Params->end(); 2193 Param != ParamEnd; ++Param) { 2194 NamedDecl *Named = cast<NamedDecl>(*Param); 2195 if (Named->getDeclName()) { 2196 S->AddDecl(DeclPtrTy::make(Named)); 2197 IdResolver.AddDecl(Named); 2198 } 2199 } 2200} 2201 2202/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2203/// parsing a top-level (non-nested) C++ class, and we are now 2204/// parsing those parts of the given Method declaration that could 2205/// not be parsed earlier (C++ [class.mem]p2), such as default 2206/// arguments. This action should enter the scope of the given 2207/// Method declaration as if we had just parsed the qualified method 2208/// name. However, it should not bring the parameters into scope; 2209/// that will be performed by ActOnDelayedCXXMethodParameter. 2210void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2211 if (!MethodD) 2212 return; 2213 2214 AdjustDeclIfTemplate(MethodD); 2215 2216 CXXScopeSpec SS; 2217 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2218 QualType ClassTy 2219 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 2220 SS.setScopeRep( 2221 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 2222 ActOnCXXEnterDeclaratorScope(S, SS); 2223} 2224 2225/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2226/// C++ method declaration. We're (re-)introducing the given 2227/// function parameter into scope for use in parsing later parts of 2228/// the method declaration. For example, we could see an 2229/// ActOnParamDefaultArgument event for this parameter. 2230void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2231 if (!ParamD) 2232 return; 2233 2234 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2235 2236 // If this parameter has an unparsed default argument, clear it out 2237 // to make way for the parsed default argument. 2238 if (Param->hasUnparsedDefaultArg()) 2239 Param->setDefaultArg(0); 2240 2241 S->AddDecl(DeclPtrTy::make(Param)); 2242 if (Param->getDeclName()) 2243 IdResolver.AddDecl(Param); 2244} 2245 2246/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2247/// processing the delayed method declaration for Method. The method 2248/// declaration is now considered finished. There may be a separate 2249/// ActOnStartOfFunctionDef action later (not necessarily 2250/// immediately!) for this method, if it was also defined inside the 2251/// class body. 2252void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2253 if (!MethodD) 2254 return; 2255 2256 AdjustDeclIfTemplate(MethodD); 2257 2258 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2259 CXXScopeSpec SS; 2260 QualType ClassTy 2261 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 2262 SS.setScopeRep( 2263 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 2264 ActOnCXXExitDeclaratorScope(S, SS); 2265 2266 // Now that we have our default arguments, check the constructor 2267 // again. It could produce additional diagnostics or affect whether 2268 // the class has implicitly-declared destructors, among other 2269 // things. 2270 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2271 CheckConstructor(Constructor); 2272 2273 // Check the default arguments, which we may have added. 2274 if (!Method->isInvalidDecl()) 2275 CheckCXXDefaultArguments(Method); 2276} 2277 2278/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2279/// the well-formedness of the constructor declarator @p D with type @p 2280/// R. If there are any errors in the declarator, this routine will 2281/// emit diagnostics and set the invalid bit to true. In any case, the type 2282/// will be updated to reflect a well-formed type for the constructor and 2283/// returned. 2284QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2285 FunctionDecl::StorageClass &SC) { 2286 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2287 2288 // C++ [class.ctor]p3: 2289 // A constructor shall not be virtual (10.3) or static (9.4). A 2290 // constructor can be invoked for a const, volatile or const 2291 // volatile object. A constructor shall not be declared const, 2292 // volatile, or const volatile (9.3.2). 2293 if (isVirtual) { 2294 if (!D.isInvalidType()) 2295 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2296 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2297 << SourceRange(D.getIdentifierLoc()); 2298 D.setInvalidType(); 2299 } 2300 if (SC == FunctionDecl::Static) { 2301 if (!D.isInvalidType()) 2302 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2303 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2304 << SourceRange(D.getIdentifierLoc()); 2305 D.setInvalidType(); 2306 SC = FunctionDecl::None; 2307 } 2308 2309 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2310 if (FTI.TypeQuals != 0) { 2311 if (FTI.TypeQuals & Qualifiers::Const) 2312 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2313 << "const" << SourceRange(D.getIdentifierLoc()); 2314 if (FTI.TypeQuals & Qualifiers::Volatile) 2315 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2316 << "volatile" << SourceRange(D.getIdentifierLoc()); 2317 if (FTI.TypeQuals & Qualifiers::Restrict) 2318 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2319 << "restrict" << SourceRange(D.getIdentifierLoc()); 2320 } 2321 2322 // Rebuild the function type "R" without any type qualifiers (in 2323 // case any of the errors above fired) and with "void" as the 2324 // return type, since constructors don't have return types. We 2325 // *always* have to do this, because GetTypeForDeclarator will 2326 // put in a result type of "int" when none was specified. 2327 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2328 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2329 Proto->getNumArgs(), 2330 Proto->isVariadic(), 0); 2331} 2332 2333/// CheckConstructor - Checks a fully-formed constructor for 2334/// well-formedness, issuing any diagnostics required. Returns true if 2335/// the constructor declarator is invalid. 2336void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2337 CXXRecordDecl *ClassDecl 2338 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2339 if (!ClassDecl) 2340 return Constructor->setInvalidDecl(); 2341 2342 // C++ [class.copy]p3: 2343 // A declaration of a constructor for a class X is ill-formed if 2344 // its first parameter is of type (optionally cv-qualified) X and 2345 // either there are no other parameters or else all other 2346 // parameters have default arguments. 2347 if (!Constructor->isInvalidDecl() && 2348 ((Constructor->getNumParams() == 1) || 2349 (Constructor->getNumParams() > 1 && 2350 Constructor->getParamDecl(1)->hasDefaultArg())) && 2351 Constructor->getTemplateSpecializationKind() 2352 != TSK_ImplicitInstantiation) { 2353 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2354 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2355 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2356 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2357 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2358 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 2359 2360 // FIXME: Rather that making the constructor invalid, we should endeavor 2361 // to fix the type. 2362 Constructor->setInvalidDecl(); 2363 } 2364 } 2365 2366 // Notify the class that we've added a constructor. 2367 ClassDecl->addedConstructor(Context, Constructor); 2368} 2369 2370/// CheckDestructor - Checks a fully-formed destructor for 2371/// well-formedness, issuing any diagnostics required. 2372void Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2373 CXXRecordDecl *RD = Destructor->getParent(); 2374 2375 if (Destructor->isVirtual()) { 2376 SourceLocation Loc; 2377 2378 if (!Destructor->isImplicit()) 2379 Loc = Destructor->getLocation(); 2380 else 2381 Loc = RD->getLocation(); 2382 2383 // If we have a virtual destructor, look up the deallocation function 2384 FunctionDecl *OperatorDelete = 0; 2385 DeclarationName Name = 2386 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2387 if (!FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2388 Destructor->setOperatorDelete(OperatorDelete); 2389 } 2390} 2391 2392static inline bool 2393FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2394 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2395 FTI.ArgInfo[0].Param && 2396 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2397} 2398 2399/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2400/// the well-formednes of the destructor declarator @p D with type @p 2401/// R. If there are any errors in the declarator, this routine will 2402/// emit diagnostics and set the declarator to invalid. Even if this happens, 2403/// will be updated to reflect a well-formed type for the destructor and 2404/// returned. 2405QualType Sema::CheckDestructorDeclarator(Declarator &D, 2406 FunctionDecl::StorageClass& SC) { 2407 // C++ [class.dtor]p1: 2408 // [...] A typedef-name that names a class is a class-name 2409 // (7.1.3); however, a typedef-name that names a class shall not 2410 // be used as the identifier in the declarator for a destructor 2411 // declaration. 2412 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2413 if (isa<TypedefType>(DeclaratorType)) { 2414 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2415 << DeclaratorType; 2416 D.setInvalidType(); 2417 } 2418 2419 // C++ [class.dtor]p2: 2420 // A destructor is used to destroy objects of its class type. A 2421 // destructor takes no parameters, and no return type can be 2422 // specified for it (not even void). The address of a destructor 2423 // shall not be taken. A destructor shall not be static. A 2424 // destructor can be invoked for a const, volatile or const 2425 // volatile object. A destructor shall not be declared const, 2426 // volatile or const volatile (9.3.2). 2427 if (SC == FunctionDecl::Static) { 2428 if (!D.isInvalidType()) 2429 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2430 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2431 << SourceRange(D.getIdentifierLoc()); 2432 SC = FunctionDecl::None; 2433 D.setInvalidType(); 2434 } 2435 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2436 // Destructors don't have return types, but the parser will 2437 // happily parse something like: 2438 // 2439 // class X { 2440 // float ~X(); 2441 // }; 2442 // 2443 // The return type will be eliminated later. 2444 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2445 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2446 << SourceRange(D.getIdentifierLoc()); 2447 } 2448 2449 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2450 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2451 if (FTI.TypeQuals & Qualifiers::Const) 2452 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2453 << "const" << SourceRange(D.getIdentifierLoc()); 2454 if (FTI.TypeQuals & Qualifiers::Volatile) 2455 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2456 << "volatile" << SourceRange(D.getIdentifierLoc()); 2457 if (FTI.TypeQuals & Qualifiers::Restrict) 2458 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2459 << "restrict" << SourceRange(D.getIdentifierLoc()); 2460 D.setInvalidType(); 2461 } 2462 2463 // Make sure we don't have any parameters. 2464 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2465 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2466 2467 // Delete the parameters. 2468 FTI.freeArgs(); 2469 D.setInvalidType(); 2470 } 2471 2472 // Make sure the destructor isn't variadic. 2473 if (FTI.isVariadic) { 2474 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2475 D.setInvalidType(); 2476 } 2477 2478 // Rebuild the function type "R" without any type qualifiers or 2479 // parameters (in case any of the errors above fired) and with 2480 // "void" as the return type, since destructors don't have return 2481 // types. We *always* have to do this, because GetTypeForDeclarator 2482 // will put in a result type of "int" when none was specified. 2483 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 2484} 2485 2486/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2487/// well-formednes of the conversion function declarator @p D with 2488/// type @p R. If there are any errors in the declarator, this routine 2489/// will emit diagnostics and return true. Otherwise, it will return 2490/// false. Either way, the type @p R will be updated to reflect a 2491/// well-formed type for the conversion operator. 2492void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2493 FunctionDecl::StorageClass& SC) { 2494 // C++ [class.conv.fct]p1: 2495 // Neither parameter types nor return type can be specified. The 2496 // type of a conversion function (8.3.5) is "function taking no 2497 // parameter returning conversion-type-id." 2498 if (SC == FunctionDecl::Static) { 2499 if (!D.isInvalidType()) 2500 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2501 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2502 << SourceRange(D.getIdentifierLoc()); 2503 D.setInvalidType(); 2504 SC = FunctionDecl::None; 2505 } 2506 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2507 // Conversion functions don't have return types, but the parser will 2508 // happily parse something like: 2509 // 2510 // class X { 2511 // float operator bool(); 2512 // }; 2513 // 2514 // The return type will be changed later anyway. 2515 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2516 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2517 << SourceRange(D.getIdentifierLoc()); 2518 } 2519 2520 // Make sure we don't have any parameters. 2521 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2522 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2523 2524 // Delete the parameters. 2525 D.getTypeObject(0).Fun.freeArgs(); 2526 D.setInvalidType(); 2527 } 2528 2529 // Make sure the conversion function isn't variadic. 2530 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2531 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2532 D.setInvalidType(); 2533 } 2534 2535 // C++ [class.conv.fct]p4: 2536 // The conversion-type-id shall not represent a function type nor 2537 // an array type. 2538 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2539 if (ConvType->isArrayType()) { 2540 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2541 ConvType = Context.getPointerType(ConvType); 2542 D.setInvalidType(); 2543 } else if (ConvType->isFunctionType()) { 2544 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2545 ConvType = Context.getPointerType(ConvType); 2546 D.setInvalidType(); 2547 } 2548 2549 // Rebuild the function type "R" without any parameters (in case any 2550 // of the errors above fired) and with the conversion type as the 2551 // return type. 2552 R = Context.getFunctionType(ConvType, 0, 0, false, 2553 R->getAs<FunctionProtoType>()->getTypeQuals()); 2554 2555 // C++0x explicit conversion operators. 2556 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2557 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2558 diag::warn_explicit_conversion_functions) 2559 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2560} 2561 2562/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2563/// the declaration of the given C++ conversion function. This routine 2564/// is responsible for recording the conversion function in the C++ 2565/// class, if possible. 2566Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2567 assert(Conversion && "Expected to receive a conversion function declaration"); 2568 2569 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2570 2571 // Make sure we aren't redeclaring the conversion function. 2572 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2573 2574 // C++ [class.conv.fct]p1: 2575 // [...] A conversion function is never used to convert a 2576 // (possibly cv-qualified) object to the (possibly cv-qualified) 2577 // same object type (or a reference to it), to a (possibly 2578 // cv-qualified) base class of that type (or a reference to it), 2579 // or to (possibly cv-qualified) void. 2580 // FIXME: Suppress this warning if the conversion function ends up being a 2581 // virtual function that overrides a virtual function in a base class. 2582 QualType ClassType 2583 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2584 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2585 ConvType = ConvTypeRef->getPointeeType(); 2586 if (ConvType->isRecordType()) { 2587 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2588 if (ConvType == ClassType) 2589 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2590 << ClassType; 2591 else if (IsDerivedFrom(ClassType, ConvType)) 2592 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2593 << ClassType << ConvType; 2594 } else if (ConvType->isVoidType()) { 2595 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2596 << ClassType << ConvType; 2597 } 2598 2599 if (Conversion->getPreviousDeclaration()) { 2600 const NamedDecl *ExpectedPrevDecl = Conversion->getPreviousDeclaration(); 2601 if (FunctionTemplateDecl *ConversionTemplate 2602 = Conversion->getDescribedFunctionTemplate()) 2603 ExpectedPrevDecl = ConversionTemplate->getPreviousDeclaration(); 2604 if (ClassDecl->replaceConversion(ExpectedPrevDecl, Conversion)) 2605 return DeclPtrTy::make(Conversion); 2606 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2607 } else if (FunctionTemplateDecl *ConversionTemplate 2608 = Conversion->getDescribedFunctionTemplate()) 2609 ClassDecl->addConversionFunction(ConversionTemplate); 2610 else if (!Conversion->getPrimaryTemplate()) // ignore specializations 2611 ClassDecl->addConversionFunction(Conversion); 2612 2613 return DeclPtrTy::make(Conversion); 2614} 2615 2616//===----------------------------------------------------------------------===// 2617// Namespace Handling 2618//===----------------------------------------------------------------------===// 2619 2620/// ActOnStartNamespaceDef - This is called at the start of a namespace 2621/// definition. 2622Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2623 SourceLocation IdentLoc, 2624 IdentifierInfo *II, 2625 SourceLocation LBrace) { 2626 NamespaceDecl *Namespc = 2627 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2628 Namespc->setLBracLoc(LBrace); 2629 2630 Scope *DeclRegionScope = NamespcScope->getParent(); 2631 2632 if (II) { 2633 // C++ [namespace.def]p2: 2634 // The identifier in an original-namespace-definition shall not have been 2635 // previously defined in the declarative region in which the 2636 // original-namespace-definition appears. The identifier in an 2637 // original-namespace-definition is the name of the namespace. Subsequently 2638 // in that declarative region, it is treated as an original-namespace-name. 2639 2640 NamedDecl *PrevDecl 2641 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2642 ForRedeclaration); 2643 2644 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2645 // This is an extended namespace definition. 2646 // Attach this namespace decl to the chain of extended namespace 2647 // definitions. 2648 OrigNS->setNextNamespace(Namespc); 2649 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2650 2651 // Remove the previous declaration from the scope. 2652 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2653 IdResolver.RemoveDecl(OrigNS); 2654 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2655 } 2656 } else if (PrevDecl) { 2657 // This is an invalid name redefinition. 2658 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2659 << Namespc->getDeclName(); 2660 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2661 Namespc->setInvalidDecl(); 2662 // Continue on to push Namespc as current DeclContext and return it. 2663 } else if (II->isStr("std") && 2664 CurContext->getLookupContext()->isTranslationUnit()) { 2665 // This is the first "real" definition of the namespace "std", so update 2666 // our cache of the "std" namespace to point at this definition. 2667 if (StdNamespace) { 2668 // We had already defined a dummy namespace "std". Link this new 2669 // namespace definition to the dummy namespace "std". 2670 StdNamespace->setNextNamespace(Namespc); 2671 StdNamespace->setLocation(IdentLoc); 2672 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2673 } 2674 2675 // Make our StdNamespace cache point at the first real definition of the 2676 // "std" namespace. 2677 StdNamespace = Namespc; 2678 } 2679 2680 PushOnScopeChains(Namespc, DeclRegionScope); 2681 } else { 2682 // Anonymous namespaces. 2683 2684 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2685 // behaves as if it were replaced by 2686 // namespace unique { /* empty body */ } 2687 // using namespace unique; 2688 // namespace unique { namespace-body } 2689 // where all occurrences of 'unique' in a translation unit are 2690 // replaced by the same identifier and this identifier differs 2691 // from all other identifiers in the entire program. 2692 2693 // We just create the namespace with an empty name and then add an 2694 // implicit using declaration, just like the standard suggests. 2695 // 2696 // CodeGen enforces the "universally unique" aspect by giving all 2697 // declarations semantically contained within an anonymous 2698 // namespace internal linkage. 2699 2700 assert(Namespc->isAnonymousNamespace()); 2701 CurContext->addDecl(Namespc); 2702 2703 UsingDirectiveDecl* UD 2704 = UsingDirectiveDecl::Create(Context, CurContext, 2705 /* 'using' */ LBrace, 2706 /* 'namespace' */ SourceLocation(), 2707 /* qualifier */ SourceRange(), 2708 /* NNS */ NULL, 2709 /* identifier */ SourceLocation(), 2710 Namespc, 2711 /* Ancestor */ CurContext); 2712 UD->setImplicit(); 2713 CurContext->addDecl(UD); 2714 } 2715 2716 // Although we could have an invalid decl (i.e. the namespace name is a 2717 // redefinition), push it as current DeclContext and try to continue parsing. 2718 // FIXME: We should be able to push Namespc here, so that the each DeclContext 2719 // for the namespace has the declarations that showed up in that particular 2720 // namespace definition. 2721 PushDeclContext(NamespcScope, Namespc); 2722 return DeclPtrTy::make(Namespc); 2723} 2724 2725/// ActOnFinishNamespaceDef - This callback is called after a namespace is 2726/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 2727void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 2728 Decl *Dcl = D.getAs<Decl>(); 2729 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 2730 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 2731 Namespc->setRBracLoc(RBrace); 2732 PopDeclContext(); 2733} 2734 2735Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 2736 SourceLocation UsingLoc, 2737 SourceLocation NamespcLoc, 2738 const CXXScopeSpec &SS, 2739 SourceLocation IdentLoc, 2740 IdentifierInfo *NamespcName, 2741 AttributeList *AttrList) { 2742 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2743 assert(NamespcName && "Invalid NamespcName."); 2744 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 2745 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2746 2747 UsingDirectiveDecl *UDir = 0; 2748 2749 // Lookup namespace name. 2750 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 2751 LookupParsedName(R, S, &SS); 2752 if (R.isAmbiguous()) 2753 return DeclPtrTy(); 2754 2755 if (!R.empty()) { 2756 NamedDecl *NS = R.getFoundDecl(); 2757 // FIXME: Namespace aliases! 2758 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 2759 // C++ [namespace.udir]p1: 2760 // A using-directive specifies that the names in the nominated 2761 // namespace can be used in the scope in which the 2762 // using-directive appears after the using-directive. During 2763 // unqualified name lookup (3.4.1), the names appear as if they 2764 // were declared in the nearest enclosing namespace which 2765 // contains both the using-directive and the nominated 2766 // namespace. [Note: in this context, "contains" means "contains 2767 // directly or indirectly". ] 2768 2769 // Find enclosing context containing both using-directive and 2770 // nominated namespace. 2771 DeclContext *CommonAncestor = cast<DeclContext>(NS); 2772 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 2773 CommonAncestor = CommonAncestor->getParent(); 2774 2775 UDir = UsingDirectiveDecl::Create(Context, 2776 CurContext, UsingLoc, 2777 NamespcLoc, 2778 SS.getRange(), 2779 (NestedNameSpecifier *)SS.getScopeRep(), 2780 IdentLoc, 2781 cast<NamespaceDecl>(NS), 2782 CommonAncestor); 2783 PushUsingDirective(S, UDir); 2784 } else { 2785 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 2786 } 2787 2788 // FIXME: We ignore attributes for now. 2789 delete AttrList; 2790 return DeclPtrTy::make(UDir); 2791} 2792 2793void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2794 // If scope has associated entity, then using directive is at namespace 2795 // or translation unit scope. We add UsingDirectiveDecls, into 2796 // it's lookup structure. 2797 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2798 Ctx->addDecl(UDir); 2799 else 2800 // Otherwise it is block-sope. using-directives will affect lookup 2801 // only to the end of scope. 2802 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2803} 2804 2805 2806Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2807 AccessSpecifier AS, 2808 SourceLocation UsingLoc, 2809 const CXXScopeSpec &SS, 2810 UnqualifiedId &Name, 2811 AttributeList *AttrList, 2812 bool IsTypeName, 2813 SourceLocation TypenameLoc) { 2814 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2815 2816 switch (Name.getKind()) { 2817 case UnqualifiedId::IK_Identifier: 2818 case UnqualifiedId::IK_OperatorFunctionId: 2819 case UnqualifiedId::IK_ConversionFunctionId: 2820 break; 2821 2822 case UnqualifiedId::IK_ConstructorName: 2823 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 2824 << SS.getRange(); 2825 return DeclPtrTy(); 2826 2827 case UnqualifiedId::IK_DestructorName: 2828 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 2829 << SS.getRange(); 2830 return DeclPtrTy(); 2831 2832 case UnqualifiedId::IK_TemplateId: 2833 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 2834 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 2835 return DeclPtrTy(); 2836 } 2837 2838 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 2839 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 2840 Name.getSourceRange().getBegin(), 2841 TargetName, AttrList, 2842 /* IsInstantiation */ false, 2843 IsTypeName, TypenameLoc); 2844 if (UD) { 2845 PushOnScopeChains(UD, S); 2846 UD->setAccess(AS); 2847 } 2848 2849 return DeclPtrTy::make(UD); 2850} 2851 2852/// Builds a shadow declaration corresponding to a 'using' declaration. 2853static UsingShadowDecl *BuildUsingShadowDecl(Sema &SemaRef, Scope *S, 2854 AccessSpecifier AS, 2855 UsingDecl *UD, NamedDecl *Orig) { 2856 // FIXME: diagnose hiding, collisions 2857 2858 // If we resolved to another shadow declaration, just coalesce them. 2859 if (isa<UsingShadowDecl>(Orig)) { 2860 Orig = cast<UsingShadowDecl>(Orig)->getTargetDecl(); 2861 assert(!isa<UsingShadowDecl>(Orig) && "nested shadow declaration"); 2862 } 2863 2864 UsingShadowDecl *Shadow 2865 = UsingShadowDecl::Create(SemaRef.Context, SemaRef.CurContext, 2866 UD->getLocation(), UD, Orig); 2867 UD->addShadowDecl(Shadow); 2868 2869 if (S) 2870 SemaRef.PushOnScopeChains(Shadow, S); 2871 else 2872 SemaRef.CurContext->addDecl(Shadow); 2873 Shadow->setAccess(AS); 2874 2875 return Shadow; 2876} 2877 2878/// Builds a using declaration. 2879/// 2880/// \param IsInstantiation - Whether this call arises from an 2881/// instantiation of an unresolved using declaration. We treat 2882/// the lookup differently for these declarations. 2883NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 2884 SourceLocation UsingLoc, 2885 const CXXScopeSpec &SS, 2886 SourceLocation IdentLoc, 2887 DeclarationName Name, 2888 AttributeList *AttrList, 2889 bool IsInstantiation, 2890 bool IsTypeName, 2891 SourceLocation TypenameLoc) { 2892 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2893 assert(IdentLoc.isValid() && "Invalid TargetName location."); 2894 2895 // FIXME: We ignore attributes for now. 2896 delete AttrList; 2897 2898 if (SS.isEmpty()) { 2899 Diag(IdentLoc, diag::err_using_requires_qualname); 2900 return 0; 2901 } 2902 2903 NestedNameSpecifier *NNS = 2904 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 2905 2906 DeclContext *LookupContext = computeDeclContext(SS); 2907 if (!LookupContext) { 2908 if (IsTypeName) { 2909 return UnresolvedUsingTypenameDecl::Create(Context, CurContext, 2910 UsingLoc, TypenameLoc, 2911 SS.getRange(), NNS, 2912 IdentLoc, Name); 2913 } else { 2914 return UnresolvedUsingValueDecl::Create(Context, CurContext, 2915 UsingLoc, SS.getRange(), NNS, 2916 IdentLoc, Name); 2917 } 2918 } 2919 2920 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(CurContext)) { 2921 // C++0x N2914 [namespace.udecl]p3: 2922 // A using-declaration used as a member-declaration shall refer to a member 2923 // of a base class of the class being defined, shall refer to a member of an 2924 // anonymous union that is a member of a base class of the class being 2925 // defined, or shall refer to an enumerator for an enumeration type that is 2926 // a member of a base class of the class being defined. 2927 2928 CXXRecordDecl *LookupRD = dyn_cast<CXXRecordDecl>(LookupContext); 2929 if (!LookupRD || !RD->isDerivedFrom(LookupRD)) { 2930 Diag(SS.getRange().getBegin(), 2931 diag::err_using_decl_nested_name_specifier_is_not_a_base_class) 2932 << NNS << RD->getDeclName(); 2933 return 0; 2934 } 2935 } else { 2936 // C++0x N2914 [namespace.udecl]p8: 2937 // A using-declaration for a class member shall be a member-declaration. 2938 if (isa<CXXRecordDecl>(LookupContext)) { 2939 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_class_member) 2940 << SS.getRange(); 2941 return 0; 2942 } 2943 } 2944 2945 // Look up the target name. Unlike most lookups, we do not want to 2946 // hide tag declarations: tag names are visible through the using 2947 // declaration even if hidden by ordinary names. 2948 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 2949 2950 // We don't hide tags behind ordinary decls if we're in a 2951 // non-dependent context, but in a dependent context, this is 2952 // important for the stability of two-phase lookup. 2953 if (!IsInstantiation) 2954 R.setHideTags(false); 2955 2956 LookupQualifiedName(R, LookupContext); 2957 2958 if (R.empty()) { 2959 Diag(IdentLoc, diag::err_no_member) 2960 << Name << LookupContext << SS.getRange(); 2961 return 0; 2962 } 2963 2964 if (R.isAmbiguous()) 2965 return 0; 2966 2967 if (IsTypeName) { 2968 // If we asked for a typename and got a non-type decl, error out. 2969 if (R.getResultKind() != LookupResult::Found 2970 || !isa<TypeDecl>(R.getFoundDecl())) { 2971 Diag(IdentLoc, diag::err_using_typename_non_type); 2972 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 2973 Diag((*I)->getUnderlyingDecl()->getLocation(), 2974 diag::note_using_decl_target); 2975 return 0; 2976 } 2977 } else { 2978 // If we asked for a non-typename and we got a type, error out, 2979 // but only if this is an instantiation of an unresolved using 2980 // decl. Otherwise just silently find the type name. 2981 if (IsInstantiation && 2982 R.getResultKind() == LookupResult::Found && 2983 isa<TypeDecl>(R.getFoundDecl())) { 2984 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 2985 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 2986 return 0; 2987 } 2988 } 2989 2990 // C++0x N2914 [namespace.udecl]p6: 2991 // A using-declaration shall not name a namespace. 2992 if (R.getResultKind() == LookupResult::Found 2993 && isa<NamespaceDecl>(R.getFoundDecl())) { 2994 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 2995 << SS.getRange(); 2996 return 0; 2997 } 2998 2999 UsingDecl *UD = UsingDecl::Create(Context, CurContext, IdentLoc, 3000 SS.getRange(), UsingLoc, NNS, Name, 3001 IsTypeName); 3002 3003 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3004 BuildUsingShadowDecl(*this, S, AS, UD, *I); 3005 3006 return UD; 3007} 3008 3009/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3010/// is a namespace alias, returns the namespace it points to. 3011static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3012 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3013 return AD->getNamespace(); 3014 return dyn_cast_or_null<NamespaceDecl>(D); 3015} 3016 3017Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3018 SourceLocation NamespaceLoc, 3019 SourceLocation AliasLoc, 3020 IdentifierInfo *Alias, 3021 const CXXScopeSpec &SS, 3022 SourceLocation IdentLoc, 3023 IdentifierInfo *Ident) { 3024 3025 // Lookup the namespace name. 3026 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3027 LookupParsedName(R, S, &SS); 3028 3029 // Check if we have a previous declaration with the same name. 3030 if (NamedDecl *PrevDecl 3031 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3032 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3033 // We already have an alias with the same name that points to the same 3034 // namespace, so don't create a new one. 3035 if (!R.isAmbiguous() && !R.empty() && 3036 AD->getNamespace() == getNamespaceDecl(R.getFoundDecl())) 3037 return DeclPtrTy(); 3038 } 3039 3040 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3041 diag::err_redefinition_different_kind; 3042 Diag(AliasLoc, DiagID) << Alias; 3043 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3044 return DeclPtrTy(); 3045 } 3046 3047 if (R.isAmbiguous()) 3048 return DeclPtrTy(); 3049 3050 if (R.empty()) { 3051 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3052 return DeclPtrTy(); 3053 } 3054 3055 NamespaceAliasDecl *AliasDecl = 3056 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3057 Alias, SS.getRange(), 3058 (NestedNameSpecifier *)SS.getScopeRep(), 3059 IdentLoc, R.getFoundDecl()); 3060 3061 CurContext->addDecl(AliasDecl); 3062 return DeclPtrTy::make(AliasDecl); 3063} 3064 3065void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3066 CXXConstructorDecl *Constructor) { 3067 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3068 !Constructor->isUsed()) && 3069 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3070 3071 CXXRecordDecl *ClassDecl 3072 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3073 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3074 3075 if (SetBaseOrMemberInitializers(Constructor, 0, 0, true)) { 3076 Diag(CurrentLocation, diag::note_ctor_synthesized_at) 3077 << Context.getTagDeclType(ClassDecl); 3078 Constructor->setInvalidDecl(); 3079 } else { 3080 Constructor->setUsed(); 3081 } 3082 return; 3083} 3084 3085void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3086 CXXDestructorDecl *Destructor) { 3087 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3088 "DefineImplicitDestructor - call it for implicit default dtor"); 3089 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3090 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3091 // C++ [class.dtor] p5 3092 // Before the implicitly-declared default destructor for a class is 3093 // implicitly defined, all the implicitly-declared default destructors 3094 // for its base class and its non-static data members shall have been 3095 // implicitly defined. 3096 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3097 E = ClassDecl->bases_end(); Base != E; ++Base) { 3098 CXXRecordDecl *BaseClassDecl 3099 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3100 if (!BaseClassDecl->hasTrivialDestructor()) { 3101 if (CXXDestructorDecl *BaseDtor = 3102 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 3103 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 3104 else 3105 assert(false && 3106 "DefineImplicitDestructor - missing dtor in a base class"); 3107 } 3108 } 3109 3110 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3111 E = ClassDecl->field_end(); Field != E; ++Field) { 3112 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3113 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3114 FieldType = Array->getElementType(); 3115 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3116 CXXRecordDecl *FieldClassDecl 3117 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3118 if (!FieldClassDecl->hasTrivialDestructor()) { 3119 if (CXXDestructorDecl *FieldDtor = 3120 const_cast<CXXDestructorDecl*>( 3121 FieldClassDecl->getDestructor(Context))) 3122 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 3123 else 3124 assert(false && 3125 "DefineImplicitDestructor - missing dtor in class of a data member"); 3126 } 3127 } 3128 } 3129 Destructor->setUsed(); 3130} 3131 3132void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3133 CXXMethodDecl *MethodDecl) { 3134 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3135 MethodDecl->getOverloadedOperator() == OO_Equal && 3136 !MethodDecl->isUsed()) && 3137 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3138 3139 CXXRecordDecl *ClassDecl 3140 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3141 3142 // C++[class.copy] p12 3143 // Before the implicitly-declared copy assignment operator for a class is 3144 // implicitly defined, all implicitly-declared copy assignment operators 3145 // for its direct base classes and its nonstatic data members shall have 3146 // been implicitly defined. 3147 bool err = false; 3148 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3149 E = ClassDecl->bases_end(); Base != E; ++Base) { 3150 CXXRecordDecl *BaseClassDecl 3151 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3152 if (CXXMethodDecl *BaseAssignOpMethod = 3153 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 3154 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3155 } 3156 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3157 E = ClassDecl->field_end(); Field != E; ++Field) { 3158 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3159 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3160 FieldType = Array->getElementType(); 3161 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3162 CXXRecordDecl *FieldClassDecl 3163 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3164 if (CXXMethodDecl *FieldAssignOpMethod = 3165 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 3166 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3167 } else if (FieldType->isReferenceType()) { 3168 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3169 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3170 Diag(Field->getLocation(), diag::note_declared_at); 3171 Diag(CurrentLocation, diag::note_first_required_here); 3172 err = true; 3173 } else if (FieldType.isConstQualified()) { 3174 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3175 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3176 Diag(Field->getLocation(), diag::note_declared_at); 3177 Diag(CurrentLocation, diag::note_first_required_here); 3178 err = true; 3179 } 3180 } 3181 if (!err) 3182 MethodDecl->setUsed(); 3183} 3184 3185CXXMethodDecl * 3186Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 3187 CXXRecordDecl *ClassDecl) { 3188 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3189 QualType RHSType(LHSType); 3190 // If class's assignment operator argument is const/volatile qualified, 3191 // look for operator = (const/volatile B&). Otherwise, look for 3192 // operator = (B&). 3193 RHSType = Context.getCVRQualifiedType(RHSType, 3194 ParmDecl->getType().getCVRQualifiers()); 3195 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3196 LHSType, 3197 SourceLocation())); 3198 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3199 RHSType, 3200 SourceLocation())); 3201 Expr *Args[2] = { &*LHS, &*RHS }; 3202 OverloadCandidateSet CandidateSet; 3203 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3204 CandidateSet); 3205 OverloadCandidateSet::iterator Best; 3206 if (BestViableFunction(CandidateSet, 3207 ClassDecl->getLocation(), Best) == OR_Success) 3208 return cast<CXXMethodDecl>(Best->Function); 3209 assert(false && 3210 "getAssignOperatorMethod - copy assignment operator method not found"); 3211 return 0; 3212} 3213 3214void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3215 CXXConstructorDecl *CopyConstructor, 3216 unsigned TypeQuals) { 3217 assert((CopyConstructor->isImplicit() && 3218 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 3219 !CopyConstructor->isUsed()) && 3220 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3221 3222 CXXRecordDecl *ClassDecl 3223 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3224 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3225 // C++ [class.copy] p209 3226 // Before the implicitly-declared copy constructor for a class is 3227 // implicitly defined, all the implicitly-declared copy constructors 3228 // for its base class and its non-static data members shall have been 3229 // implicitly defined. 3230 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3231 Base != ClassDecl->bases_end(); ++Base) { 3232 CXXRecordDecl *BaseClassDecl 3233 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3234 if (CXXConstructorDecl *BaseCopyCtor = 3235 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 3236 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3237 } 3238 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3239 FieldEnd = ClassDecl->field_end(); 3240 Field != FieldEnd; ++Field) { 3241 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3242 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3243 FieldType = Array->getElementType(); 3244 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3245 CXXRecordDecl *FieldClassDecl 3246 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3247 if (CXXConstructorDecl *FieldCopyCtor = 3248 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 3249 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3250 } 3251 } 3252 CopyConstructor->setUsed(); 3253} 3254 3255Sema::OwningExprResult 3256Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3257 CXXConstructorDecl *Constructor, 3258 MultiExprArg ExprArgs) { 3259 bool Elidable = false; 3260 3261 // C++ [class.copy]p15: 3262 // Whenever a temporary class object is copied using a copy constructor, and 3263 // this object and the copy have the same cv-unqualified type, an 3264 // implementation is permitted to treat the original and the copy as two 3265 // different ways of referring to the same object and not perform a copy at 3266 // all, even if the class copy constructor or destructor have side effects. 3267 3268 // FIXME: Is this enough? 3269 if (Constructor->isCopyConstructor(Context)) { 3270 Expr *E = ((Expr **)ExprArgs.get())[0]; 3271 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 3272 E = BE->getSubExpr(); 3273 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3274 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3275 E = ICE->getSubExpr(); 3276 3277 if (isa<CallExpr>(E) || isa<CXXTemporaryObjectExpr>(E)) 3278 Elidable = true; 3279 } 3280 3281 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 3282 Elidable, move(ExprArgs)); 3283} 3284 3285/// BuildCXXConstructExpr - Creates a complete call to a constructor, 3286/// including handling of its default argument expressions. 3287Sema::OwningExprResult 3288Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3289 CXXConstructorDecl *Constructor, bool Elidable, 3290 MultiExprArg ExprArgs) { 3291 unsigned NumExprs = ExprArgs.size(); 3292 Expr **Exprs = (Expr **)ExprArgs.release(); 3293 3294 MarkDeclarationReferenced(ConstructLoc, Constructor); 3295 return Owned(CXXConstructExpr::Create(Context, DeclInitType, Constructor, 3296 Elidable, Exprs, NumExprs)); 3297} 3298 3299Sema::OwningExprResult 3300Sema::BuildCXXTemporaryObjectExpr(CXXConstructorDecl *Constructor, 3301 QualType Ty, 3302 SourceLocation TyBeginLoc, 3303 MultiExprArg Args, 3304 SourceLocation RParenLoc) { 3305 unsigned NumExprs = Args.size(); 3306 Expr **Exprs = (Expr **)Args.release(); 3307 3308 MarkDeclarationReferenced(TyBeginLoc, Constructor); 3309 return Owned(new (Context) CXXTemporaryObjectExpr(Context, Constructor, Ty, 3310 TyBeginLoc, Exprs, 3311 NumExprs, RParenLoc)); 3312} 3313 3314 3315bool Sema::InitializeVarWithConstructor(VarDecl *VD, 3316 CXXConstructorDecl *Constructor, 3317 MultiExprArg Exprs) { 3318 OwningExprResult TempResult = 3319 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 3320 move(Exprs)); 3321 if (TempResult.isInvalid()) 3322 return true; 3323 3324 Expr *Temp = TempResult.takeAs<Expr>(); 3325 MarkDeclarationReferenced(VD->getLocation(), Constructor); 3326 Temp = MaybeCreateCXXExprWithTemporaries(Temp, /*DestroyTemps=*/true); 3327 VD->setInit(Context, Temp); 3328 3329 return false; 3330} 3331 3332void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) { 3333 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 3334 DeclInitType->getAs<RecordType>()->getDecl()); 3335 if (!ClassDecl->hasTrivialDestructor()) 3336 if (CXXDestructorDecl *Destructor = 3337 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 3338 MarkDeclarationReferenced(VD->getLocation(), Destructor); 3339} 3340 3341/// AddCXXDirectInitializerToDecl - This action is called immediately after 3342/// ActOnDeclarator, when a C++ direct initializer is present. 3343/// e.g: "int x(1);" 3344void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 3345 SourceLocation LParenLoc, 3346 MultiExprArg Exprs, 3347 SourceLocation *CommaLocs, 3348 SourceLocation RParenLoc) { 3349 unsigned NumExprs = Exprs.size(); 3350 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 3351 Decl *RealDecl = Dcl.getAs<Decl>(); 3352 3353 // If there is no declaration, there was an error parsing it. Just ignore 3354 // the initializer. 3355 if (RealDecl == 0) 3356 return; 3357 3358 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3359 if (!VDecl) { 3360 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3361 RealDecl->setInvalidDecl(); 3362 return; 3363 } 3364 3365 // We will represent direct-initialization similarly to copy-initialization: 3366 // int x(1); -as-> int x = 1; 3367 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 3368 // 3369 // Clients that want to distinguish between the two forms, can check for 3370 // direct initializer using VarDecl::hasCXXDirectInitializer(). 3371 // A major benefit is that clients that don't particularly care about which 3372 // exactly form was it (like the CodeGen) can handle both cases without 3373 // special case code. 3374 3375 // If either the declaration has a dependent type or if any of the expressions 3376 // is type-dependent, we represent the initialization via a ParenListExpr for 3377 // later use during template instantiation. 3378 if (VDecl->getType()->isDependentType() || 3379 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 3380 // Let clients know that initialization was done with a direct initializer. 3381 VDecl->setCXXDirectInitializer(true); 3382 3383 // Store the initialization expressions as a ParenListExpr. 3384 unsigned NumExprs = Exprs.size(); 3385 VDecl->setInit(Context, 3386 new (Context) ParenListExpr(Context, LParenLoc, 3387 (Expr **)Exprs.release(), 3388 NumExprs, RParenLoc)); 3389 return; 3390 } 3391 3392 3393 // C++ 8.5p11: 3394 // The form of initialization (using parentheses or '=') is generally 3395 // insignificant, but does matter when the entity being initialized has a 3396 // class type. 3397 QualType DeclInitType = VDecl->getType(); 3398 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 3399 DeclInitType = Context.getBaseElementType(Array); 3400 3401 // FIXME: This isn't the right place to complete the type. 3402 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 3403 diag::err_typecheck_decl_incomplete_type)) { 3404 VDecl->setInvalidDecl(); 3405 return; 3406 } 3407 3408 if (VDecl->getType()->isRecordType()) { 3409 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 3410 3411 CXXConstructorDecl *Constructor 3412 = PerformInitializationByConstructor(DeclInitType, 3413 move(Exprs), 3414 VDecl->getLocation(), 3415 SourceRange(VDecl->getLocation(), 3416 RParenLoc), 3417 VDecl->getDeclName(), 3418 IK_Direct, 3419 ConstructorArgs); 3420 if (!Constructor) 3421 RealDecl->setInvalidDecl(); 3422 else { 3423 VDecl->setCXXDirectInitializer(true); 3424 if (InitializeVarWithConstructor(VDecl, Constructor, 3425 move_arg(ConstructorArgs))) 3426 RealDecl->setInvalidDecl(); 3427 FinalizeVarWithDestructor(VDecl, DeclInitType); 3428 } 3429 return; 3430 } 3431 3432 if (NumExprs > 1) { 3433 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 3434 << SourceRange(VDecl->getLocation(), RParenLoc); 3435 RealDecl->setInvalidDecl(); 3436 return; 3437 } 3438 3439 // Let clients know that initialization was done with a direct initializer. 3440 VDecl->setCXXDirectInitializer(true); 3441 3442 assert(NumExprs == 1 && "Expected 1 expression"); 3443 // Set the init expression, handles conversions. 3444 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 3445 /*DirectInit=*/true); 3446} 3447 3448/// \brief Add the applicable constructor candidates for an initialization 3449/// by constructor. 3450static void AddConstructorInitializationCandidates(Sema &SemaRef, 3451 QualType ClassType, 3452 Expr **Args, 3453 unsigned NumArgs, 3454 Sema::InitializationKind Kind, 3455 OverloadCandidateSet &CandidateSet) { 3456 // C++ [dcl.init]p14: 3457 // If the initialization is direct-initialization, or if it is 3458 // copy-initialization where the cv-unqualified version of the 3459 // source type is the same class as, or a derived class of, the 3460 // class of the destination, constructors are considered. The 3461 // applicable constructors are enumerated (13.3.1.3), and the 3462 // best one is chosen through overload resolution (13.3). The 3463 // constructor so selected is called to initialize the object, 3464 // with the initializer expression(s) as its argument(s). If no 3465 // constructor applies, or the overload resolution is ambiguous, 3466 // the initialization is ill-formed. 3467 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 3468 assert(ClassRec && "Can only initialize a class type here"); 3469 3470 // FIXME: When we decide not to synthesize the implicitly-declared 3471 // constructors, we'll need to make them appear here. 3472 3473 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 3474 DeclarationName ConstructorName 3475 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 3476 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 3477 DeclContext::lookup_const_iterator Con, ConEnd; 3478 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 3479 Con != ConEnd; ++Con) { 3480 // Find the constructor (which may be a template). 3481 CXXConstructorDecl *Constructor = 0; 3482 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 3483 if (ConstructorTmpl) 3484 Constructor 3485 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 3486 else 3487 Constructor = cast<CXXConstructorDecl>(*Con); 3488 3489 if ((Kind == Sema::IK_Direct) || 3490 (Kind == Sema::IK_Copy && 3491 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 3492 (Kind == Sema::IK_Default && Constructor->isDefaultConstructor())) { 3493 if (ConstructorTmpl) 3494 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, 3495 /*ExplicitArgs*/ 0, 3496 Args, NumArgs, CandidateSet); 3497 else 3498 SemaRef.AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 3499 } 3500 } 3501} 3502 3503/// \brief Attempt to perform initialization by constructor 3504/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 3505/// copy-initialization. 3506/// 3507/// This routine determines whether initialization by constructor is possible, 3508/// but it does not emit any diagnostics in the case where the initialization 3509/// is ill-formed. 3510/// 3511/// \param ClassType the type of the object being initialized, which must have 3512/// class type. 3513/// 3514/// \param Args the arguments provided to initialize the object 3515/// 3516/// \param NumArgs the number of arguments provided to initialize the object 3517/// 3518/// \param Kind the type of initialization being performed 3519/// 3520/// \returns the constructor used to initialize the object, if successful. 3521/// Otherwise, emits a diagnostic and returns NULL. 3522CXXConstructorDecl * 3523Sema::TryInitializationByConstructor(QualType ClassType, 3524 Expr **Args, unsigned NumArgs, 3525 SourceLocation Loc, 3526 InitializationKind Kind) { 3527 // Build the overload candidate set 3528 OverloadCandidateSet CandidateSet; 3529 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 3530 CandidateSet); 3531 3532 // Determine whether we found a constructor we can use. 3533 OverloadCandidateSet::iterator Best; 3534 switch (BestViableFunction(CandidateSet, Loc, Best)) { 3535 case OR_Success: 3536 case OR_Deleted: 3537 // We found a constructor. Return it. 3538 return cast<CXXConstructorDecl>(Best->Function); 3539 3540 case OR_No_Viable_Function: 3541 case OR_Ambiguous: 3542 // Overload resolution failed. Return nothing. 3543 return 0; 3544 } 3545 3546 // Silence GCC warning 3547 return 0; 3548} 3549 3550/// \brief Perform initialization by constructor (C++ [dcl.init]p14), which 3551/// may occur as part of direct-initialization or copy-initialization. 3552/// 3553/// \param ClassType the type of the object being initialized, which must have 3554/// class type. 3555/// 3556/// \param ArgsPtr the arguments provided to initialize the object 3557/// 3558/// \param Loc the source location where the initialization occurs 3559/// 3560/// \param Range the source range that covers the entire initialization 3561/// 3562/// \param InitEntity the name of the entity being initialized, if known 3563/// 3564/// \param Kind the type of initialization being performed 3565/// 3566/// \param ConvertedArgs a vector that will be filled in with the 3567/// appropriately-converted arguments to the constructor (if initialization 3568/// succeeded). 3569/// 3570/// \returns the constructor used to initialize the object, if successful. 3571/// Otherwise, emits a diagnostic and returns NULL. 3572CXXConstructorDecl * 3573Sema::PerformInitializationByConstructor(QualType ClassType, 3574 MultiExprArg ArgsPtr, 3575 SourceLocation Loc, SourceRange Range, 3576 DeclarationName InitEntity, 3577 InitializationKind Kind, 3578 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 3579 3580 // Build the overload candidate set 3581 Expr **Args = (Expr **)ArgsPtr.get(); 3582 unsigned NumArgs = ArgsPtr.size(); 3583 OverloadCandidateSet CandidateSet; 3584 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 3585 CandidateSet); 3586 3587 OverloadCandidateSet::iterator Best; 3588 switch (BestViableFunction(CandidateSet, Loc, Best)) { 3589 case OR_Success: 3590 // We found a constructor. Break out so that we can convert the arguments 3591 // appropriately. 3592 break; 3593 3594 case OR_No_Viable_Function: 3595 if (InitEntity) 3596 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 3597 << InitEntity << Range; 3598 else 3599 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 3600 << ClassType << Range; 3601 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 3602 return 0; 3603 3604 case OR_Ambiguous: 3605 if (InitEntity) 3606 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 3607 else 3608 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 3609 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3610 return 0; 3611 3612 case OR_Deleted: 3613 if (InitEntity) 3614 Diag(Loc, diag::err_ovl_deleted_init) 3615 << Best->Function->isDeleted() 3616 << InitEntity << Range; 3617 else 3618 Diag(Loc, diag::err_ovl_deleted_init) 3619 << Best->Function->isDeleted() 3620 << InitEntity << Range; 3621 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3622 return 0; 3623 } 3624 3625 // Convert the arguments, fill in default arguments, etc. 3626 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function); 3627 if (CompleteConstructorCall(Constructor, move(ArgsPtr), Loc, ConvertedArgs)) 3628 return 0; 3629 3630 return Constructor; 3631} 3632 3633/// \brief Given a constructor and the set of arguments provided for the 3634/// constructor, convert the arguments and add any required default arguments 3635/// to form a proper call to this constructor. 3636/// 3637/// \returns true if an error occurred, false otherwise. 3638bool 3639Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 3640 MultiExprArg ArgsPtr, 3641 SourceLocation Loc, 3642 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 3643 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 3644 unsigned NumArgs = ArgsPtr.size(); 3645 Expr **Args = (Expr **)ArgsPtr.get(); 3646 3647 const FunctionProtoType *Proto 3648 = Constructor->getType()->getAs<FunctionProtoType>(); 3649 assert(Proto && "Constructor without a prototype?"); 3650 unsigned NumArgsInProto = Proto->getNumArgs(); 3651 unsigned NumArgsToCheck = NumArgs; 3652 3653 // If too few arguments are available, we'll fill in the rest with defaults. 3654 if (NumArgs < NumArgsInProto) { 3655 NumArgsToCheck = NumArgsInProto; 3656 ConvertedArgs.reserve(NumArgsInProto); 3657 } else { 3658 ConvertedArgs.reserve(NumArgs); 3659 if (NumArgs > NumArgsInProto) 3660 NumArgsToCheck = NumArgsInProto; 3661 } 3662 3663 // Convert arguments 3664 for (unsigned i = 0; i != NumArgsToCheck; i++) { 3665 QualType ProtoArgType = Proto->getArgType(i); 3666 3667 Expr *Arg; 3668 if (i < NumArgs) { 3669 Arg = Args[i]; 3670 3671 // Pass the argument. 3672 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 3673 return true; 3674 3675 Args[i] = 0; 3676 } else { 3677 ParmVarDecl *Param = Constructor->getParamDecl(i); 3678 3679 OwningExprResult DefArg = BuildCXXDefaultArgExpr(Loc, Constructor, Param); 3680 if (DefArg.isInvalid()) 3681 return true; 3682 3683 Arg = DefArg.takeAs<Expr>(); 3684 } 3685 3686 ConvertedArgs.push_back(Arg); 3687 } 3688 3689 // If this is a variadic call, handle args passed through "...". 3690 if (Proto->isVariadic()) { 3691 // Promote the arguments (C99 6.5.2.2p7). 3692 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 3693 Expr *Arg = Args[i]; 3694 if (DefaultVariadicArgumentPromotion(Arg, VariadicConstructor)) 3695 return true; 3696 3697 ConvertedArgs.push_back(Arg); 3698 Args[i] = 0; 3699 } 3700 } 3701 3702 return false; 3703} 3704 3705/// CompareReferenceRelationship - Compare the two types T1 and T2 to 3706/// determine whether they are reference-related, 3707/// reference-compatible, reference-compatible with added 3708/// qualification, or incompatible, for use in C++ initialization by 3709/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 3710/// type, and the first type (T1) is the pointee type of the reference 3711/// type being initialized. 3712Sema::ReferenceCompareResult 3713Sema::CompareReferenceRelationship(SourceLocation Loc, 3714 QualType OrigT1, QualType OrigT2, 3715 bool& DerivedToBase) { 3716 assert(!OrigT1->isReferenceType() && 3717 "T1 must be the pointee type of the reference type"); 3718 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 3719 3720 QualType T1 = Context.getCanonicalType(OrigT1); 3721 QualType T2 = Context.getCanonicalType(OrigT2); 3722 QualType UnqualT1 = T1.getLocalUnqualifiedType(); 3723 QualType UnqualT2 = T2.getLocalUnqualifiedType(); 3724 3725 // C++ [dcl.init.ref]p4: 3726 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 3727 // reference-related to "cv2 T2" if T1 is the same type as T2, or 3728 // T1 is a base class of T2. 3729 if (UnqualT1 == UnqualT2) 3730 DerivedToBase = false; 3731 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 3732 !RequireCompleteType(Loc, OrigT2, PDiag()) && 3733 IsDerivedFrom(UnqualT2, UnqualT1)) 3734 DerivedToBase = true; 3735 else 3736 return Ref_Incompatible; 3737 3738 // At this point, we know that T1 and T2 are reference-related (at 3739 // least). 3740 3741 // C++ [dcl.init.ref]p4: 3742 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 3743 // reference-related to T2 and cv1 is the same cv-qualification 3744 // as, or greater cv-qualification than, cv2. For purposes of 3745 // overload resolution, cases for which cv1 is greater 3746 // cv-qualification than cv2 are identified as 3747 // reference-compatible with added qualification (see 13.3.3.2). 3748 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 3749 return Ref_Compatible; 3750 else if (T1.isMoreQualifiedThan(T2)) 3751 return Ref_Compatible_With_Added_Qualification; 3752 else 3753 return Ref_Related; 3754} 3755 3756/// CheckReferenceInit - Check the initialization of a reference 3757/// variable with the given initializer (C++ [dcl.init.ref]). Init is 3758/// the initializer (either a simple initializer or an initializer 3759/// list), and DeclType is the type of the declaration. When ICS is 3760/// non-null, this routine will compute the implicit conversion 3761/// sequence according to C++ [over.ics.ref] and will not produce any 3762/// diagnostics; when ICS is null, it will emit diagnostics when any 3763/// errors are found. Either way, a return value of true indicates 3764/// that there was a failure, a return value of false indicates that 3765/// the reference initialization succeeded. 3766/// 3767/// When @p SuppressUserConversions, user-defined conversions are 3768/// suppressed. 3769/// When @p AllowExplicit, we also permit explicit user-defined 3770/// conversion functions. 3771/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 3772/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 3773/// This is used when this is called from a C-style cast. 3774bool 3775Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 3776 SourceLocation DeclLoc, 3777 bool SuppressUserConversions, 3778 bool AllowExplicit, bool ForceRValue, 3779 ImplicitConversionSequence *ICS, 3780 bool IgnoreBaseAccess) { 3781 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 3782 3783 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 3784 QualType T2 = Init->getType(); 3785 3786 // If the initializer is the address of an overloaded function, try 3787 // to resolve the overloaded function. If all goes well, T2 is the 3788 // type of the resulting function. 3789 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 3790 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 3791 ICS != 0); 3792 if (Fn) { 3793 // Since we're performing this reference-initialization for 3794 // real, update the initializer with the resulting function. 3795 if (!ICS) { 3796 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 3797 return true; 3798 3799 Init = FixOverloadedFunctionReference(Init, Fn); 3800 } 3801 3802 T2 = Fn->getType(); 3803 } 3804 } 3805 3806 // Compute some basic properties of the types and the initializer. 3807 bool isRValRef = DeclType->isRValueReferenceType(); 3808 bool DerivedToBase = false; 3809 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 3810 Init->isLvalue(Context); 3811 ReferenceCompareResult RefRelationship 3812 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 3813 3814 // Most paths end in a failed conversion. 3815 if (ICS) 3816 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 3817 3818 // C++ [dcl.init.ref]p5: 3819 // A reference to type "cv1 T1" is initialized by an expression 3820 // of type "cv2 T2" as follows: 3821 3822 // -- If the initializer expression 3823 3824 // Rvalue references cannot bind to lvalues (N2812). 3825 // There is absolutely no situation where they can. In particular, note that 3826 // this is ill-formed, even if B has a user-defined conversion to A&&: 3827 // B b; 3828 // A&& r = b; 3829 if (isRValRef && InitLvalue == Expr::LV_Valid) { 3830 if (!ICS) 3831 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 3832 << Init->getSourceRange(); 3833 return true; 3834 } 3835 3836 bool BindsDirectly = false; 3837 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 3838 // reference-compatible with "cv2 T2," or 3839 // 3840 // Note that the bit-field check is skipped if we are just computing 3841 // the implicit conversion sequence (C++ [over.best.ics]p2). 3842 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 3843 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 3844 BindsDirectly = true; 3845 3846 if (ICS) { 3847 // C++ [over.ics.ref]p1: 3848 // When a parameter of reference type binds directly (8.5.3) 3849 // to an argument expression, the implicit conversion sequence 3850 // is the identity conversion, unless the argument expression 3851 // has a type that is a derived class of the parameter type, 3852 // in which case the implicit conversion sequence is a 3853 // derived-to-base Conversion (13.3.3.1). 3854 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 3855 ICS->Standard.First = ICK_Identity; 3856 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 3857 ICS->Standard.Third = ICK_Identity; 3858 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 3859 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 3860 ICS->Standard.ReferenceBinding = true; 3861 ICS->Standard.DirectBinding = true; 3862 ICS->Standard.RRefBinding = false; 3863 ICS->Standard.CopyConstructor = 0; 3864 3865 // Nothing more to do: the inaccessibility/ambiguity check for 3866 // derived-to-base conversions is suppressed when we're 3867 // computing the implicit conversion sequence (C++ 3868 // [over.best.ics]p2). 3869 return false; 3870 } else { 3871 // Perform the conversion. 3872 CastExpr::CastKind CK = CastExpr::CK_NoOp; 3873 if (DerivedToBase) 3874 CK = CastExpr::CK_DerivedToBase; 3875 else if(CheckExceptionSpecCompatibility(Init, T1)) 3876 return true; 3877 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 3878 } 3879 } 3880 3881 // -- has a class type (i.e., T2 is a class type) and can be 3882 // implicitly converted to an lvalue of type "cv3 T3," 3883 // where "cv1 T1" is reference-compatible with "cv3 T3" 3884 // 92) (this conversion is selected by enumerating the 3885 // applicable conversion functions (13.3.1.6) and choosing 3886 // the best one through overload resolution (13.3)), 3887 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 3888 !RequireCompleteType(DeclLoc, T2, 0)) { 3889 CXXRecordDecl *T2RecordDecl 3890 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 3891 3892 OverloadCandidateSet CandidateSet; 3893 const UnresolvedSet *Conversions 3894 = T2RecordDecl->getVisibleConversionFunctions(); 3895 for (UnresolvedSet::iterator I = Conversions->begin(), 3896 E = Conversions->end(); I != E; ++I) { 3897 FunctionTemplateDecl *ConvTemplate 3898 = dyn_cast<FunctionTemplateDecl>(*I); 3899 CXXConversionDecl *Conv; 3900 if (ConvTemplate) 3901 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 3902 else 3903 Conv = cast<CXXConversionDecl>(*I); 3904 3905 // If the conversion function doesn't return a reference type, 3906 // it can't be considered for this conversion. 3907 if (Conv->getConversionType()->isLValueReferenceType() && 3908 (AllowExplicit || !Conv->isExplicit())) { 3909 if (ConvTemplate) 3910 AddTemplateConversionCandidate(ConvTemplate, Init, DeclType, 3911 CandidateSet); 3912 else 3913 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 3914 } 3915 } 3916 3917 OverloadCandidateSet::iterator Best; 3918 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 3919 case OR_Success: 3920 // This is a direct binding. 3921 BindsDirectly = true; 3922 3923 if (ICS) { 3924 // C++ [over.ics.ref]p1: 3925 // 3926 // [...] If the parameter binds directly to the result of 3927 // applying a conversion function to the argument 3928 // expression, the implicit conversion sequence is a 3929 // user-defined conversion sequence (13.3.3.1.2), with the 3930 // second standard conversion sequence either an identity 3931 // conversion or, if the conversion function returns an 3932 // entity of a type that is a derived class of the parameter 3933 // type, a derived-to-base Conversion. 3934 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 3935 ICS->UserDefined.Before = Best->Conversions[0].Standard; 3936 ICS->UserDefined.After = Best->FinalConversion; 3937 ICS->UserDefined.ConversionFunction = Best->Function; 3938 ICS->UserDefined.EllipsisConversion = false; 3939 assert(ICS->UserDefined.After.ReferenceBinding && 3940 ICS->UserDefined.After.DirectBinding && 3941 "Expected a direct reference binding!"); 3942 return false; 3943 } else { 3944 OwningExprResult InitConversion = 3945 BuildCXXCastArgument(DeclLoc, QualType(), 3946 CastExpr::CK_UserDefinedConversion, 3947 cast<CXXMethodDecl>(Best->Function), 3948 Owned(Init)); 3949 Init = InitConversion.takeAs<Expr>(); 3950 3951 if (CheckExceptionSpecCompatibility(Init, T1)) 3952 return true; 3953 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 3954 /*isLvalue=*/true); 3955 } 3956 break; 3957 3958 case OR_Ambiguous: 3959 if (ICS) { 3960 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 3961 Cand != CandidateSet.end(); ++Cand) 3962 if (Cand->Viable) 3963 ICS->ConversionFunctionSet.push_back(Cand->Function); 3964 break; 3965 } 3966 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 3967 << Init->getSourceRange(); 3968 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3969 return true; 3970 3971 case OR_No_Viable_Function: 3972 case OR_Deleted: 3973 // There was no suitable conversion, or we found a deleted 3974 // conversion; continue with other checks. 3975 break; 3976 } 3977 } 3978 3979 if (BindsDirectly) { 3980 // C++ [dcl.init.ref]p4: 3981 // [...] In all cases where the reference-related or 3982 // reference-compatible relationship of two types is used to 3983 // establish the validity of a reference binding, and T1 is a 3984 // base class of T2, a program that necessitates such a binding 3985 // is ill-formed if T1 is an inaccessible (clause 11) or 3986 // ambiguous (10.2) base class of T2. 3987 // 3988 // Note that we only check this condition when we're allowed to 3989 // complain about errors, because we should not be checking for 3990 // ambiguity (or inaccessibility) unless the reference binding 3991 // actually happens. 3992 if (DerivedToBase) 3993 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 3994 Init->getSourceRange(), 3995 IgnoreBaseAccess); 3996 else 3997 return false; 3998 } 3999 4000 // -- Otherwise, the reference shall be to a non-volatile const 4001 // type (i.e., cv1 shall be const), or the reference shall be an 4002 // rvalue reference and the initializer expression shall be an rvalue. 4003 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4004 if (!ICS) 4005 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4006 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 4007 << T2 << Init->getSourceRange(); 4008 return true; 4009 } 4010 4011 // -- If the initializer expression is an rvalue, with T2 a 4012 // class type, and "cv1 T1" is reference-compatible with 4013 // "cv2 T2," the reference is bound in one of the 4014 // following ways (the choice is implementation-defined): 4015 // 4016 // -- The reference is bound to the object represented by 4017 // the rvalue (see 3.10) or to a sub-object within that 4018 // object. 4019 // 4020 // -- A temporary of type "cv1 T2" [sic] is created, and 4021 // a constructor is called to copy the entire rvalue 4022 // object into the temporary. The reference is bound to 4023 // the temporary or to a sub-object within the 4024 // temporary. 4025 // 4026 // The constructor that would be used to make the copy 4027 // shall be callable whether or not the copy is actually 4028 // done. 4029 // 4030 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4031 // freedom, so we will always take the first option and never build 4032 // a temporary in this case. FIXME: We will, however, have to check 4033 // for the presence of a copy constructor in C++98/03 mode. 4034 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4035 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4036 if (ICS) { 4037 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 4038 ICS->Standard.First = ICK_Identity; 4039 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4040 ICS->Standard.Third = ICK_Identity; 4041 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4042 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 4043 ICS->Standard.ReferenceBinding = true; 4044 ICS->Standard.DirectBinding = false; 4045 ICS->Standard.RRefBinding = isRValRef; 4046 ICS->Standard.CopyConstructor = 0; 4047 } else { 4048 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4049 if (DerivedToBase) 4050 CK = CastExpr::CK_DerivedToBase; 4051 else if(CheckExceptionSpecCompatibility(Init, T1)) 4052 return true; 4053 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4054 } 4055 return false; 4056 } 4057 4058 // -- Otherwise, a temporary of type "cv1 T1" is created and 4059 // initialized from the initializer expression using the 4060 // rules for a non-reference copy initialization (8.5). The 4061 // reference is then bound to the temporary. If T1 is 4062 // reference-related to T2, cv1 must be the same 4063 // cv-qualification as, or greater cv-qualification than, 4064 // cv2; otherwise, the program is ill-formed. 4065 if (RefRelationship == Ref_Related) { 4066 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4067 // we would be reference-compatible or reference-compatible with 4068 // added qualification. But that wasn't the case, so the reference 4069 // initialization fails. 4070 if (!ICS) 4071 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4072 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 4073 << T2 << Init->getSourceRange(); 4074 return true; 4075 } 4076 4077 // If at least one of the types is a class type, the types are not 4078 // related, and we aren't allowed any user conversions, the 4079 // reference binding fails. This case is important for breaking 4080 // recursion, since TryImplicitConversion below will attempt to 4081 // create a temporary through the use of a copy constructor. 4082 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4083 (T1->isRecordType() || T2->isRecordType())) { 4084 if (!ICS) 4085 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4086 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 4087 return true; 4088 } 4089 4090 // Actually try to convert the initializer to T1. 4091 if (ICS) { 4092 // C++ [over.ics.ref]p2: 4093 // 4094 // When a parameter of reference type is not bound directly to 4095 // an argument expression, the conversion sequence is the one 4096 // required to convert the argument expression to the 4097 // underlying type of the reference according to 4098 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4099 // to copy-initializing a temporary of the underlying type with 4100 // the argument expression. Any difference in top-level 4101 // cv-qualification is subsumed by the initialization itself 4102 // and does not constitute a conversion. 4103 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4104 /*AllowExplicit=*/false, 4105 /*ForceRValue=*/false, 4106 /*InOverloadResolution=*/false); 4107 4108 // Of course, that's still a reference binding. 4109 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 4110 ICS->Standard.ReferenceBinding = true; 4111 ICS->Standard.RRefBinding = isRValRef; 4112 } else if (ICS->ConversionKind == 4113 ImplicitConversionSequence::UserDefinedConversion) { 4114 ICS->UserDefined.After.ReferenceBinding = true; 4115 ICS->UserDefined.After.RRefBinding = isRValRef; 4116 } 4117 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 4118 } else { 4119 ImplicitConversionSequence Conversions; 4120 bool badConversion = PerformImplicitConversion(Init, T1, "initializing", 4121 false, false, 4122 Conversions); 4123 if (badConversion) { 4124 if ((Conversions.ConversionKind == 4125 ImplicitConversionSequence::BadConversion) 4126 && !Conversions.ConversionFunctionSet.empty()) { 4127 Diag(DeclLoc, 4128 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4129 for (int j = Conversions.ConversionFunctionSet.size()-1; 4130 j >= 0; j--) { 4131 FunctionDecl *Func = Conversions.ConversionFunctionSet[j]; 4132 Diag(Func->getLocation(), diag::err_ovl_candidate); 4133 } 4134 } 4135 else { 4136 if (isRValRef) 4137 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4138 << Init->getSourceRange(); 4139 else 4140 Diag(DeclLoc, diag::err_invalid_initialization) 4141 << DeclType << Init->getType() << Init->getSourceRange(); 4142 } 4143 } 4144 return badConversion; 4145 } 4146} 4147 4148/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4149/// of this overloaded operator is well-formed. If so, returns false; 4150/// otherwise, emits appropriate diagnostics and returns true. 4151bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4152 assert(FnDecl && FnDecl->isOverloadedOperator() && 4153 "Expected an overloaded operator declaration"); 4154 4155 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4156 4157 // C++ [over.oper]p5: 4158 // The allocation and deallocation functions, operator new, 4159 // operator new[], operator delete and operator delete[], are 4160 // described completely in 3.7.3. The attributes and restrictions 4161 // found in the rest of this subclause do not apply to them unless 4162 // explicitly stated in 3.7.3. 4163 // FIXME: Write a separate routine for checking this. For now, just allow it. 4164 if (Op == OO_Delete || Op == OO_Array_Delete) 4165 return false; 4166 4167 if (Op == OO_New || Op == OO_Array_New) { 4168 bool ret = false; 4169 if (FunctionDecl::param_iterator Param = FnDecl->param_begin()) { 4170 QualType SizeTy = Context.getCanonicalType(Context.getSizeType()); 4171 QualType T = Context.getCanonicalType((*Param)->getType()); 4172 if (!T->isDependentType() && SizeTy != T) { 4173 Diag(FnDecl->getLocation(), 4174 diag::err_operator_new_param_type) << FnDecl->getDeclName() 4175 << SizeTy; 4176 ret = true; 4177 } 4178 } 4179 QualType ResultTy = Context.getCanonicalType(FnDecl->getResultType()); 4180 if (!ResultTy->isDependentType() && ResultTy != Context.VoidPtrTy) 4181 return Diag(FnDecl->getLocation(), 4182 diag::err_operator_new_result_type) << FnDecl->getDeclName() 4183 << static_cast<QualType>(Context.VoidPtrTy); 4184 return ret; 4185 } 4186 4187 // C++ [over.oper]p6: 4188 // An operator function shall either be a non-static member 4189 // function or be a non-member function and have at least one 4190 // parameter whose type is a class, a reference to a class, an 4191 // enumeration, or a reference to an enumeration. 4192 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4193 if (MethodDecl->isStatic()) 4194 return Diag(FnDecl->getLocation(), 4195 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4196 } else { 4197 bool ClassOrEnumParam = false; 4198 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4199 ParamEnd = FnDecl->param_end(); 4200 Param != ParamEnd; ++Param) { 4201 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4202 if (ParamType->isDependentType() || ParamType->isRecordType() || 4203 ParamType->isEnumeralType()) { 4204 ClassOrEnumParam = true; 4205 break; 4206 } 4207 } 4208 4209 if (!ClassOrEnumParam) 4210 return Diag(FnDecl->getLocation(), 4211 diag::err_operator_overload_needs_class_or_enum) 4212 << FnDecl->getDeclName(); 4213 } 4214 4215 // C++ [over.oper]p8: 4216 // An operator function cannot have default arguments (8.3.6), 4217 // except where explicitly stated below. 4218 // 4219 // Only the function-call operator allows default arguments 4220 // (C++ [over.call]p1). 4221 if (Op != OO_Call) { 4222 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4223 Param != FnDecl->param_end(); ++Param) { 4224 if ((*Param)->hasUnparsedDefaultArg()) 4225 return Diag((*Param)->getLocation(), 4226 diag::err_operator_overload_default_arg) 4227 << FnDecl->getDeclName(); 4228 else if (Expr *DefArg = (*Param)->getDefaultArg()) 4229 return Diag((*Param)->getLocation(), 4230 diag::err_operator_overload_default_arg) 4231 << FnDecl->getDeclName() << DefArg->getSourceRange(); 4232 } 4233 } 4234 4235 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4236 { false, false, false } 4237#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4238 , { Unary, Binary, MemberOnly } 4239#include "clang/Basic/OperatorKinds.def" 4240 }; 4241 4242 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4243 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4244 bool MustBeMemberOperator = OperatorUses[Op][2]; 4245 4246 // C++ [over.oper]p8: 4247 // [...] Operator functions cannot have more or fewer parameters 4248 // than the number required for the corresponding operator, as 4249 // described in the rest of this subclause. 4250 unsigned NumParams = FnDecl->getNumParams() 4251 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4252 if (Op != OO_Call && 4253 ((NumParams == 1 && !CanBeUnaryOperator) || 4254 (NumParams == 2 && !CanBeBinaryOperator) || 4255 (NumParams < 1) || (NumParams > 2))) { 4256 // We have the wrong number of parameters. 4257 unsigned ErrorKind; 4258 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4259 ErrorKind = 2; // 2 -> unary or binary. 4260 } else if (CanBeUnaryOperator) { 4261 ErrorKind = 0; // 0 -> unary 4262 } else { 4263 assert(CanBeBinaryOperator && 4264 "All non-call overloaded operators are unary or binary!"); 4265 ErrorKind = 1; // 1 -> binary 4266 } 4267 4268 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4269 << FnDecl->getDeclName() << NumParams << ErrorKind; 4270 } 4271 4272 // Overloaded operators other than operator() cannot be variadic. 4273 if (Op != OO_Call && 4274 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4275 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4276 << FnDecl->getDeclName(); 4277 } 4278 4279 // Some operators must be non-static member functions. 4280 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4281 return Diag(FnDecl->getLocation(), 4282 diag::err_operator_overload_must_be_member) 4283 << FnDecl->getDeclName(); 4284 } 4285 4286 // C++ [over.inc]p1: 4287 // The user-defined function called operator++ implements the 4288 // prefix and postfix ++ operator. If this function is a member 4289 // function with no parameters, or a non-member function with one 4290 // parameter of class or enumeration type, it defines the prefix 4291 // increment operator ++ for objects of that type. If the function 4292 // is a member function with one parameter (which shall be of type 4293 // int) or a non-member function with two parameters (the second 4294 // of which shall be of type int), it defines the postfix 4295 // increment operator ++ for objects of that type. 4296 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4297 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4298 bool ParamIsInt = false; 4299 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4300 ParamIsInt = BT->getKind() == BuiltinType::Int; 4301 4302 if (!ParamIsInt) 4303 return Diag(LastParam->getLocation(), 4304 diag::err_operator_overload_post_incdec_must_be_int) 4305 << LastParam->getType() << (Op == OO_MinusMinus); 4306 } 4307 4308 // Notify the class if it got an assignment operator. 4309 if (Op == OO_Equal) { 4310 // Would have returned earlier otherwise. 4311 assert(isa<CXXMethodDecl>(FnDecl) && 4312 "Overloaded = not member, but not filtered."); 4313 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 4314 Method->getParent()->addedAssignmentOperator(Context, Method); 4315 } 4316 4317 return false; 4318} 4319 4320/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 4321/// linkage specification, including the language and (if present) 4322/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 4323/// the location of the language string literal, which is provided 4324/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 4325/// the '{' brace. Otherwise, this linkage specification does not 4326/// have any braces. 4327Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 4328 SourceLocation ExternLoc, 4329 SourceLocation LangLoc, 4330 const char *Lang, 4331 unsigned StrSize, 4332 SourceLocation LBraceLoc) { 4333 LinkageSpecDecl::LanguageIDs Language; 4334 if (strncmp(Lang, "\"C\"", StrSize) == 0) 4335 Language = LinkageSpecDecl::lang_c; 4336 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 4337 Language = LinkageSpecDecl::lang_cxx; 4338 else { 4339 Diag(LangLoc, diag::err_bad_language); 4340 return DeclPtrTy(); 4341 } 4342 4343 // FIXME: Add all the various semantics of linkage specifications 4344 4345 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 4346 LangLoc, Language, 4347 LBraceLoc.isValid()); 4348 CurContext->addDecl(D); 4349 PushDeclContext(S, D); 4350 return DeclPtrTy::make(D); 4351} 4352 4353/// ActOnFinishLinkageSpecification - Completely the definition of 4354/// the C++ linkage specification LinkageSpec. If RBraceLoc is 4355/// valid, it's the position of the closing '}' brace in a linkage 4356/// specification that uses braces. 4357Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 4358 DeclPtrTy LinkageSpec, 4359 SourceLocation RBraceLoc) { 4360 if (LinkageSpec) 4361 PopDeclContext(); 4362 return LinkageSpec; 4363} 4364 4365/// \brief Perform semantic analysis for the variable declaration that 4366/// occurs within a C++ catch clause, returning the newly-created 4367/// variable. 4368VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 4369 DeclaratorInfo *DInfo, 4370 IdentifierInfo *Name, 4371 SourceLocation Loc, 4372 SourceRange Range) { 4373 bool Invalid = false; 4374 4375 // Arrays and functions decay. 4376 if (ExDeclType->isArrayType()) 4377 ExDeclType = Context.getArrayDecayedType(ExDeclType); 4378 else if (ExDeclType->isFunctionType()) 4379 ExDeclType = Context.getPointerType(ExDeclType); 4380 4381 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 4382 // The exception-declaration shall not denote a pointer or reference to an 4383 // incomplete type, other than [cv] void*. 4384 // N2844 forbids rvalue references. 4385 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 4386 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 4387 Invalid = true; 4388 } 4389 4390 QualType BaseType = ExDeclType; 4391 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 4392 unsigned DK = diag::err_catch_incomplete; 4393 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 4394 BaseType = Ptr->getPointeeType(); 4395 Mode = 1; 4396 DK = diag::err_catch_incomplete_ptr; 4397 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 4398 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 4399 BaseType = Ref->getPointeeType(); 4400 Mode = 2; 4401 DK = diag::err_catch_incomplete_ref; 4402 } 4403 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 4404 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 4405 Invalid = true; 4406 4407 if (!Invalid && !ExDeclType->isDependentType() && 4408 RequireNonAbstractType(Loc, ExDeclType, 4409 diag::err_abstract_type_in_decl, 4410 AbstractVariableType)) 4411 Invalid = true; 4412 4413 // FIXME: Need to test for ability to copy-construct and destroy the 4414 // exception variable. 4415 4416 // FIXME: Need to check for abstract classes. 4417 4418 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 4419 Name, ExDeclType, DInfo, VarDecl::None); 4420 4421 if (Invalid) 4422 ExDecl->setInvalidDecl(); 4423 4424 return ExDecl; 4425} 4426 4427/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 4428/// handler. 4429Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 4430 DeclaratorInfo *DInfo = 0; 4431 QualType ExDeclType = GetTypeForDeclarator(D, S, &DInfo); 4432 4433 bool Invalid = D.isInvalidType(); 4434 IdentifierInfo *II = D.getIdentifier(); 4435 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 4436 // The scope should be freshly made just for us. There is just no way 4437 // it contains any previous declaration. 4438 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 4439 if (PrevDecl->isTemplateParameter()) { 4440 // Maybe we will complain about the shadowed template parameter. 4441 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4442 } 4443 } 4444 4445 if (D.getCXXScopeSpec().isSet() && !Invalid) { 4446 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 4447 << D.getCXXScopeSpec().getRange(); 4448 Invalid = true; 4449 } 4450 4451 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, DInfo, 4452 D.getIdentifier(), 4453 D.getIdentifierLoc(), 4454 D.getDeclSpec().getSourceRange()); 4455 4456 if (Invalid) 4457 ExDecl->setInvalidDecl(); 4458 4459 // Add the exception declaration into this scope. 4460 if (II) 4461 PushOnScopeChains(ExDecl, S); 4462 else 4463 CurContext->addDecl(ExDecl); 4464 4465 ProcessDeclAttributes(S, ExDecl, D); 4466 return DeclPtrTy::make(ExDecl); 4467} 4468 4469Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 4470 ExprArg assertexpr, 4471 ExprArg assertmessageexpr) { 4472 Expr *AssertExpr = (Expr *)assertexpr.get(); 4473 StringLiteral *AssertMessage = 4474 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 4475 4476 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 4477 llvm::APSInt Value(32); 4478 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 4479 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 4480 AssertExpr->getSourceRange(); 4481 return DeclPtrTy(); 4482 } 4483 4484 if (Value == 0) { 4485 std::string str(AssertMessage->getStrData(), 4486 AssertMessage->getByteLength()); 4487 Diag(AssertLoc, diag::err_static_assert_failed) 4488 << str << AssertExpr->getSourceRange(); 4489 } 4490 } 4491 4492 assertexpr.release(); 4493 assertmessageexpr.release(); 4494 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 4495 AssertExpr, AssertMessage); 4496 4497 CurContext->addDecl(Decl); 4498 return DeclPtrTy::make(Decl); 4499} 4500 4501/// Handle a friend type declaration. This works in tandem with 4502/// ActOnTag. 4503/// 4504/// Notes on friend class templates: 4505/// 4506/// We generally treat friend class declarations as if they were 4507/// declaring a class. So, for example, the elaborated type specifier 4508/// in a friend declaration is required to obey the restrictions of a 4509/// class-head (i.e. no typedefs in the scope chain), template 4510/// parameters are required to match up with simple template-ids, &c. 4511/// However, unlike when declaring a template specialization, it's 4512/// okay to refer to a template specialization without an empty 4513/// template parameter declaration, e.g. 4514/// friend class A<T>::B<unsigned>; 4515/// We permit this as a special case; if there are any template 4516/// parameters present at all, require proper matching, i.e. 4517/// template <> template <class T> friend class A<int>::B; 4518Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 4519 MultiTemplateParamsArg TempParams) { 4520 SourceLocation Loc = DS.getSourceRange().getBegin(); 4521 4522 assert(DS.isFriendSpecified()); 4523 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 4524 4525 // Try to convert the decl specifier to a type. This works for 4526 // friend templates because ActOnTag never produces a ClassTemplateDecl 4527 // for a TUK_Friend. 4528 Declarator TheDeclarator(DS, Declarator::MemberContext); 4529 QualType T = GetTypeForDeclarator(TheDeclarator, S); 4530 if (TheDeclarator.isInvalidType()) 4531 return DeclPtrTy(); 4532 4533 // This is definitely an error in C++98. It's probably meant to 4534 // be forbidden in C++0x, too, but the specification is just 4535 // poorly written. 4536 // 4537 // The problem is with declarations like the following: 4538 // template <T> friend A<T>::foo; 4539 // where deciding whether a class C is a friend or not now hinges 4540 // on whether there exists an instantiation of A that causes 4541 // 'foo' to equal C. There are restrictions on class-heads 4542 // (which we declare (by fiat) elaborated friend declarations to 4543 // be) that makes this tractable. 4544 // 4545 // FIXME: handle "template <> friend class A<T>;", which 4546 // is possibly well-formed? Who even knows? 4547 if (TempParams.size() && !isa<ElaboratedType>(T)) { 4548 Diag(Loc, diag::err_tagless_friend_type_template) 4549 << DS.getSourceRange(); 4550 return DeclPtrTy(); 4551 } 4552 4553 // C++ [class.friend]p2: 4554 // An elaborated-type-specifier shall be used in a friend declaration 4555 // for a class.* 4556 // * The class-key of the elaborated-type-specifier is required. 4557 // This is one of the rare places in Clang where it's legitimate to 4558 // ask about the "spelling" of the type. 4559 if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) { 4560 // If we evaluated the type to a record type, suggest putting 4561 // a tag in front. 4562 if (const RecordType *RT = T->getAs<RecordType>()) { 4563 RecordDecl *RD = RT->getDecl(); 4564 4565 std::string InsertionText = std::string(" ") + RD->getKindName(); 4566 4567 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 4568 << (unsigned) RD->getTagKind() 4569 << T 4570 << SourceRange(DS.getFriendSpecLoc()) 4571 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 4572 InsertionText); 4573 return DeclPtrTy(); 4574 }else { 4575 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 4576 << DS.getSourceRange(); 4577 return DeclPtrTy(); 4578 } 4579 } 4580 4581 // Enum types cannot be friends. 4582 if (T->getAs<EnumType>()) { 4583 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 4584 << SourceRange(DS.getFriendSpecLoc()); 4585 return DeclPtrTy(); 4586 } 4587 4588 // C++98 [class.friend]p1: A friend of a class is a function 4589 // or class that is not a member of the class . . . 4590 // But that's a silly restriction which nobody implements for 4591 // inner classes, and C++0x removes it anyway, so we only report 4592 // this (as a warning) if we're being pedantic. 4593 if (!getLangOptions().CPlusPlus0x) 4594 if (const RecordType *RT = T->getAs<RecordType>()) 4595 if (RT->getDecl()->getDeclContext() == CurContext) 4596 Diag(DS.getFriendSpecLoc(), diag::ext_friend_inner_class); 4597 4598 Decl *D; 4599 if (TempParams.size()) 4600 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 4601 TempParams.size(), 4602 (TemplateParameterList**) TempParams.release(), 4603 T.getTypePtr(), 4604 DS.getFriendSpecLoc()); 4605 else 4606 D = FriendDecl::Create(Context, CurContext, Loc, T.getTypePtr(), 4607 DS.getFriendSpecLoc()); 4608 D->setAccess(AS_public); 4609 CurContext->addDecl(D); 4610 4611 return DeclPtrTy::make(D); 4612} 4613 4614Sema::DeclPtrTy 4615Sema::ActOnFriendFunctionDecl(Scope *S, 4616 Declarator &D, 4617 bool IsDefinition, 4618 MultiTemplateParamsArg TemplateParams) { 4619 const DeclSpec &DS = D.getDeclSpec(); 4620 4621 assert(DS.isFriendSpecified()); 4622 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 4623 4624 SourceLocation Loc = D.getIdentifierLoc(); 4625 DeclaratorInfo *DInfo = 0; 4626 QualType T = GetTypeForDeclarator(D, S, &DInfo); 4627 4628 // C++ [class.friend]p1 4629 // A friend of a class is a function or class.... 4630 // Note that this sees through typedefs, which is intended. 4631 // It *doesn't* see through dependent types, which is correct 4632 // according to [temp.arg.type]p3: 4633 // If a declaration acquires a function type through a 4634 // type dependent on a template-parameter and this causes 4635 // a declaration that does not use the syntactic form of a 4636 // function declarator to have a function type, the program 4637 // is ill-formed. 4638 if (!T->isFunctionType()) { 4639 Diag(Loc, diag::err_unexpected_friend); 4640 4641 // It might be worthwhile to try to recover by creating an 4642 // appropriate declaration. 4643 return DeclPtrTy(); 4644 } 4645 4646 // C++ [namespace.memdef]p3 4647 // - If a friend declaration in a non-local class first declares a 4648 // class or function, the friend class or function is a member 4649 // of the innermost enclosing namespace. 4650 // - The name of the friend is not found by simple name lookup 4651 // until a matching declaration is provided in that namespace 4652 // scope (either before or after the class declaration granting 4653 // friendship). 4654 // - If a friend function is called, its name may be found by the 4655 // name lookup that considers functions from namespaces and 4656 // classes associated with the types of the function arguments. 4657 // - When looking for a prior declaration of a class or a function 4658 // declared as a friend, scopes outside the innermost enclosing 4659 // namespace scope are not considered. 4660 4661 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 4662 DeclarationName Name = GetNameForDeclarator(D); 4663 assert(Name); 4664 4665 // The context we found the declaration in, or in which we should 4666 // create the declaration. 4667 DeclContext *DC; 4668 4669 // FIXME: handle local classes 4670 4671 // Recover from invalid scope qualifiers as if they just weren't there. 4672 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 4673 ForRedeclaration); 4674 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 4675 // FIXME: RequireCompleteDeclContext 4676 DC = computeDeclContext(ScopeQual); 4677 4678 // FIXME: handle dependent contexts 4679 if (!DC) return DeclPtrTy(); 4680 4681 LookupQualifiedName(Previous, DC); 4682 4683 // If searching in that context implicitly found a declaration in 4684 // a different context, treat it like it wasn't found at all. 4685 // TODO: better diagnostics for this case. Suggesting the right 4686 // qualified scope would be nice... 4687 // FIXME: getRepresentativeDecl() is not right here at all 4688 if (Previous.empty() || 4689 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 4690 D.setInvalidType(); 4691 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 4692 return DeclPtrTy(); 4693 } 4694 4695 // C++ [class.friend]p1: A friend of a class is a function or 4696 // class that is not a member of the class . . . 4697 if (DC->Equals(CurContext)) 4698 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 4699 4700 // Otherwise walk out to the nearest namespace scope looking for matches. 4701 } else { 4702 // TODO: handle local class contexts. 4703 4704 DC = CurContext; 4705 while (true) { 4706 // Skip class contexts. If someone can cite chapter and verse 4707 // for this behavior, that would be nice --- it's what GCC and 4708 // EDG do, and it seems like a reasonable intent, but the spec 4709 // really only says that checks for unqualified existing 4710 // declarations should stop at the nearest enclosing namespace, 4711 // not that they should only consider the nearest enclosing 4712 // namespace. 4713 while (DC->isRecord()) 4714 DC = DC->getParent(); 4715 4716 LookupQualifiedName(Previous, DC); 4717 4718 // TODO: decide what we think about using declarations. 4719 if (!Previous.empty()) 4720 break; 4721 4722 if (DC->isFileContext()) break; 4723 DC = DC->getParent(); 4724 } 4725 4726 // C++ [class.friend]p1: A friend of a class is a function or 4727 // class that is not a member of the class . . . 4728 // C++0x changes this for both friend types and functions. 4729 // Most C++ 98 compilers do seem to give an error here, so 4730 // we do, too. 4731 if (!Previous.empty() && DC->Equals(CurContext) 4732 && !getLangOptions().CPlusPlus0x) 4733 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 4734 } 4735 4736 if (DC->isFileContext()) { 4737 // This implies that it has to be an operator or function. 4738 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 4739 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 4740 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 4741 Diag(Loc, diag::err_introducing_special_friend) << 4742 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 4743 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 4744 return DeclPtrTy(); 4745 } 4746 } 4747 4748 bool Redeclaration = false; 4749 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, DInfo, Previous, 4750 move(TemplateParams), 4751 IsDefinition, 4752 Redeclaration); 4753 if (!ND) return DeclPtrTy(); 4754 4755 assert(ND->getDeclContext() == DC); 4756 assert(ND->getLexicalDeclContext() == CurContext); 4757 4758 // Add the function declaration to the appropriate lookup tables, 4759 // adjusting the redeclarations list as necessary. We don't 4760 // want to do this yet if the friending class is dependent. 4761 // 4762 // Also update the scope-based lookup if the target context's 4763 // lookup context is in lexical scope. 4764 if (!CurContext->isDependentContext()) { 4765 DC = DC->getLookupContext(); 4766 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 4767 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 4768 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 4769 } 4770 4771 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 4772 D.getIdentifierLoc(), ND, 4773 DS.getFriendSpecLoc()); 4774 FrD->setAccess(AS_public); 4775 CurContext->addDecl(FrD); 4776 4777 return DeclPtrTy::make(ND); 4778} 4779 4780void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 4781 AdjustDeclIfTemplate(dcl); 4782 4783 Decl *Dcl = dcl.getAs<Decl>(); 4784 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 4785 if (!Fn) { 4786 Diag(DelLoc, diag::err_deleted_non_function); 4787 return; 4788 } 4789 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 4790 Diag(DelLoc, diag::err_deleted_decl_not_first); 4791 Diag(Prev->getLocation(), diag::note_previous_declaration); 4792 // If the declaration wasn't the first, we delete the function anyway for 4793 // recovery. 4794 } 4795 Fn->setDeleted(); 4796} 4797 4798static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 4799 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 4800 ++CI) { 4801 Stmt *SubStmt = *CI; 4802 if (!SubStmt) 4803 continue; 4804 if (isa<ReturnStmt>(SubStmt)) 4805 Self.Diag(SubStmt->getSourceRange().getBegin(), 4806 diag::err_return_in_constructor_handler); 4807 if (!isa<Expr>(SubStmt)) 4808 SearchForReturnInStmt(Self, SubStmt); 4809 } 4810} 4811 4812void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 4813 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 4814 CXXCatchStmt *Handler = TryBlock->getHandler(I); 4815 SearchForReturnInStmt(*this, Handler); 4816 } 4817} 4818 4819bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 4820 const CXXMethodDecl *Old) { 4821 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 4822 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 4823 4824 QualType CNewTy = Context.getCanonicalType(NewTy); 4825 QualType COldTy = Context.getCanonicalType(OldTy); 4826 4827 if (CNewTy == COldTy && 4828 CNewTy.getLocalCVRQualifiers() == COldTy.getLocalCVRQualifiers()) 4829 return false; 4830 4831 // Check if the return types are covariant 4832 QualType NewClassTy, OldClassTy; 4833 4834 /// Both types must be pointers or references to classes. 4835 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 4836 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 4837 NewClassTy = NewPT->getPointeeType(); 4838 OldClassTy = OldPT->getPointeeType(); 4839 } 4840 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 4841 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 4842 NewClassTy = NewRT->getPointeeType(); 4843 OldClassTy = OldRT->getPointeeType(); 4844 } 4845 } 4846 4847 // The return types aren't either both pointers or references to a class type. 4848 if (NewClassTy.isNull()) { 4849 Diag(New->getLocation(), 4850 diag::err_different_return_type_for_overriding_virtual_function) 4851 << New->getDeclName() << NewTy << OldTy; 4852 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4853 4854 return true; 4855 } 4856 4857 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 4858 // Check if the new class derives from the old class. 4859 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 4860 Diag(New->getLocation(), 4861 diag::err_covariant_return_not_derived) 4862 << New->getDeclName() << NewTy << OldTy; 4863 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4864 return true; 4865 } 4866 4867 // Check if we the conversion from derived to base is valid. 4868 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 4869 diag::err_covariant_return_inaccessible_base, 4870 diag::err_covariant_return_ambiguous_derived_to_base_conv, 4871 // FIXME: Should this point to the return type? 4872 New->getLocation(), SourceRange(), New->getDeclName())) { 4873 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4874 return true; 4875 } 4876 } 4877 4878 // The qualifiers of the return types must be the same. 4879 if (CNewTy.getLocalCVRQualifiers() != COldTy.getLocalCVRQualifiers()) { 4880 Diag(New->getLocation(), 4881 diag::err_covariant_return_type_different_qualifications) 4882 << New->getDeclName() << NewTy << OldTy; 4883 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4884 return true; 4885 }; 4886 4887 4888 // The new class type must have the same or less qualifiers as the old type. 4889 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 4890 Diag(New->getLocation(), 4891 diag::err_covariant_return_type_class_type_more_qualified) 4892 << New->getDeclName() << NewTy << OldTy; 4893 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4894 return true; 4895 }; 4896 4897 return false; 4898} 4899 4900bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 4901 const CXXMethodDecl *Old) 4902{ 4903 if (Old->hasAttr<FinalAttr>()) { 4904 Diag(New->getLocation(), diag::err_final_function_overridden) 4905 << New->getDeclName(); 4906 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4907 return true; 4908 } 4909 4910 return false; 4911} 4912 4913/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 4914/// initializer for the declaration 'Dcl'. 4915/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 4916/// static data member of class X, names should be looked up in the scope of 4917/// class X. 4918void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 4919 AdjustDeclIfTemplate(Dcl); 4920 4921 Decl *D = Dcl.getAs<Decl>(); 4922 // If there is no declaration, there was an error parsing it. 4923 if (D == 0) 4924 return; 4925 4926 // Check whether it is a declaration with a nested name specifier like 4927 // int foo::bar; 4928 if (!D->isOutOfLine()) 4929 return; 4930 4931 // C++ [basic.lookup.unqual]p13 4932 // 4933 // A name used in the definition of a static data member of class X 4934 // (after the qualified-id of the static member) is looked up as if the name 4935 // was used in a member function of X. 4936 4937 // Change current context into the context of the initializing declaration. 4938 EnterDeclaratorContext(S, D->getDeclContext()); 4939} 4940 4941/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 4942/// initializer for the declaration 'Dcl'. 4943void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 4944 AdjustDeclIfTemplate(Dcl); 4945 4946 Decl *D = Dcl.getAs<Decl>(); 4947 // If there is no declaration, there was an error parsing it. 4948 if (D == 0) 4949 return; 4950 4951 // Check whether it is a declaration with a nested name specifier like 4952 // int foo::bar; 4953 if (!D->isOutOfLine()) 4954 return; 4955 4956 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 4957 ExitDeclaratorContext(S); 4958} 4959