SemaDeclCXX.cpp revision d6a637f8c8a93863509fc1bc555513ff6504957d
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/RecordLayout.h" 19#include "clang/AST/CXXInheritance.h" 20#include "clang/AST/DeclVisitor.h" 21#include "clang/AST/TypeLoc.h" 22#include "clang/AST/TypeOrdering.h" 23#include "clang/AST/StmtVisitor.h" 24#include "clang/Parse/DeclSpec.h" 25#include "clang/Parse/Template.h" 26#include "clang/Basic/PartialDiagnostic.h" 27#include "clang/Lex/Preprocessor.h" 28#include "llvm/ADT/STLExtras.h" 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 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 return Invalid; 361} 362 363/// CheckCXXDefaultArguments - Verify that the default arguments for a 364/// function declaration are well-formed according to C++ 365/// [dcl.fct.default]. 366void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 367 unsigned NumParams = FD->getNumParams(); 368 unsigned p; 369 370 // Find first parameter with a default argument 371 for (p = 0; p < NumParams; ++p) { 372 ParmVarDecl *Param = FD->getParamDecl(p); 373 if (Param->hasDefaultArg()) 374 break; 375 } 376 377 // C++ [dcl.fct.default]p4: 378 // In a given function declaration, all parameters 379 // subsequent to a parameter with a default argument shall 380 // have default arguments supplied in this or previous 381 // declarations. A default argument shall not be redefined 382 // by a later declaration (not even to the same value). 383 unsigned LastMissingDefaultArg = 0; 384 for (; p < NumParams; ++p) { 385 ParmVarDecl *Param = FD->getParamDecl(p); 386 if (!Param->hasDefaultArg()) { 387 if (Param->isInvalidDecl()) 388 /* We already complained about this parameter. */; 389 else if (Param->getIdentifier()) 390 Diag(Param->getLocation(), 391 diag::err_param_default_argument_missing_name) 392 << Param->getIdentifier(); 393 else 394 Diag(Param->getLocation(), 395 diag::err_param_default_argument_missing); 396 397 LastMissingDefaultArg = p; 398 } 399 } 400 401 if (LastMissingDefaultArg > 0) { 402 // Some default arguments were missing. Clear out all of the 403 // default arguments up to (and including) the last missing 404 // default argument, so that we leave the function parameters 405 // in a semantically valid state. 406 for (p = 0; p <= LastMissingDefaultArg; ++p) { 407 ParmVarDecl *Param = FD->getParamDecl(p); 408 if (Param->hasDefaultArg()) { 409 if (!Param->hasUnparsedDefaultArg()) 410 Param->getDefaultArg()->Destroy(Context); 411 Param->setDefaultArg(0); 412 } 413 } 414 } 415} 416 417/// isCurrentClassName - Determine whether the identifier II is the 418/// name of the class type currently being defined. In the case of 419/// nested classes, this will only return true if II is the name of 420/// the innermost class. 421bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 422 const CXXScopeSpec *SS) { 423 CXXRecordDecl *CurDecl; 424 if (SS && SS->isSet() && !SS->isInvalid()) { 425 DeclContext *DC = computeDeclContext(*SS, true); 426 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 427 } else 428 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 429 430 if (CurDecl) 431 return &II == CurDecl->getIdentifier(); 432 else 433 return false; 434} 435 436/// \brief Check the validity of a C++ base class specifier. 437/// 438/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 439/// and returns NULL otherwise. 440CXXBaseSpecifier * 441Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 442 SourceRange SpecifierRange, 443 bool Virtual, AccessSpecifier Access, 444 QualType BaseType, 445 SourceLocation BaseLoc) { 446 // C++ [class.union]p1: 447 // A union shall not have base classes. 448 if (Class->isUnion()) { 449 Diag(Class->getLocation(), diag::err_base_clause_on_union) 450 << SpecifierRange; 451 return 0; 452 } 453 454 if (BaseType->isDependentType()) 455 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 456 Class->getTagKind() == RecordDecl::TK_class, 457 Access, BaseType); 458 459 // Base specifiers must be record types. 460 if (!BaseType->isRecordType()) { 461 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 462 return 0; 463 } 464 465 // C++ [class.union]p1: 466 // A union shall not be used as a base class. 467 if (BaseType->isUnionType()) { 468 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 469 return 0; 470 } 471 472 // C++ [class.derived]p2: 473 // The class-name in a base-specifier shall not be an incompletely 474 // defined class. 475 if (RequireCompleteType(BaseLoc, BaseType, 476 PDiag(diag::err_incomplete_base_class) 477 << SpecifierRange)) 478 return 0; 479 480 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 481 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 482 assert(BaseDecl && "Record type has no declaration"); 483 BaseDecl = BaseDecl->getDefinition(Context); 484 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 485 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 486 assert(CXXBaseDecl && "Base type is not a C++ type"); 487 488 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 489 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 490 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 491 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 492 << BaseType; 493 return 0; 494 } 495 496 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 497 498 // Create the base specifier. 499 // FIXME: Allocate via ASTContext? 500 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 501 Class->getTagKind() == RecordDecl::TK_class, 502 Access, BaseType); 503} 504 505void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 506 const CXXRecordDecl *BaseClass, 507 bool BaseIsVirtual) { 508 // A class with a non-empty base class is not empty. 509 // FIXME: Standard ref? 510 if (!BaseClass->isEmpty()) 511 Class->setEmpty(false); 512 513 // C++ [class.virtual]p1: 514 // A class that [...] inherits a virtual function is called a polymorphic 515 // class. 516 if (BaseClass->isPolymorphic()) 517 Class->setPolymorphic(true); 518 519 // C++ [dcl.init.aggr]p1: 520 // An aggregate is [...] a class with [...] no base classes [...]. 521 Class->setAggregate(false); 522 523 // C++ [class]p4: 524 // A POD-struct is an aggregate class... 525 Class->setPOD(false); 526 527 if (BaseIsVirtual) { 528 // C++ [class.ctor]p5: 529 // A constructor is trivial if its class has no virtual base classes. 530 Class->setHasTrivialConstructor(false); 531 532 // C++ [class.copy]p6: 533 // A copy constructor is trivial if its class has no virtual base classes. 534 Class->setHasTrivialCopyConstructor(false); 535 536 // C++ [class.copy]p11: 537 // A copy assignment operator is trivial if its class has no virtual 538 // base classes. 539 Class->setHasTrivialCopyAssignment(false); 540 541 // C++0x [meta.unary.prop] is_empty: 542 // T is a class type, but not a union type, with ... no virtual base 543 // classes 544 Class->setEmpty(false); 545 } else { 546 // C++ [class.ctor]p5: 547 // A constructor is trivial if all the direct base classes of its 548 // class have trivial constructors. 549 if (!BaseClass->hasTrivialConstructor()) 550 Class->setHasTrivialConstructor(false); 551 552 // C++ [class.copy]p6: 553 // A copy constructor is trivial if all the direct base classes of its 554 // class have trivial copy constructors. 555 if (!BaseClass->hasTrivialCopyConstructor()) 556 Class->setHasTrivialCopyConstructor(false); 557 558 // C++ [class.copy]p11: 559 // A copy assignment operator is trivial if all the direct base classes 560 // of its class have trivial copy assignment operators. 561 if (!BaseClass->hasTrivialCopyAssignment()) 562 Class->setHasTrivialCopyAssignment(false); 563 } 564 565 // C++ [class.ctor]p3: 566 // A destructor is trivial if all the direct base classes of its class 567 // have trivial destructors. 568 if (!BaseClass->hasTrivialDestructor()) 569 Class->setHasTrivialDestructor(false); 570} 571 572/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 573/// one entry in the base class list of a class specifier, for 574/// example: 575/// class foo : public bar, virtual private baz { 576/// 'public bar' and 'virtual private baz' are each base-specifiers. 577Sema::BaseResult 578Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 579 bool Virtual, AccessSpecifier Access, 580 TypeTy *basetype, SourceLocation BaseLoc) { 581 if (!classdecl) 582 return true; 583 584 AdjustDeclIfTemplate(classdecl); 585 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 586 QualType BaseType = GetTypeFromParser(basetype); 587 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 588 Virtual, Access, 589 BaseType, BaseLoc)) 590 return BaseSpec; 591 592 return true; 593} 594 595/// \brief Performs the actual work of attaching the given base class 596/// specifiers to a C++ class. 597bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 598 unsigned NumBases) { 599 if (NumBases == 0) 600 return false; 601 602 // Used to keep track of which base types we have already seen, so 603 // that we can properly diagnose redundant direct base types. Note 604 // that the key is always the unqualified canonical type of the base 605 // class. 606 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 607 608 // Copy non-redundant base specifiers into permanent storage. 609 unsigned NumGoodBases = 0; 610 bool Invalid = false; 611 for (unsigned idx = 0; idx < NumBases; ++idx) { 612 QualType NewBaseType 613 = Context.getCanonicalType(Bases[idx]->getType()); 614 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 615 616 if (KnownBaseTypes[NewBaseType]) { 617 // C++ [class.mi]p3: 618 // A class shall not be specified as a direct base class of a 619 // derived class more than once. 620 Diag(Bases[idx]->getSourceRange().getBegin(), 621 diag::err_duplicate_base_class) 622 << KnownBaseTypes[NewBaseType]->getType() 623 << Bases[idx]->getSourceRange(); 624 625 // Delete the duplicate base class specifier; we're going to 626 // overwrite its pointer later. 627 Context.Deallocate(Bases[idx]); 628 629 Invalid = true; 630 } else { 631 // Okay, add this new base class. 632 KnownBaseTypes[NewBaseType] = Bases[idx]; 633 Bases[NumGoodBases++] = Bases[idx]; 634 } 635 } 636 637 // Attach the remaining base class specifiers to the derived class. 638 Class->setBases(Context, Bases, NumGoodBases); 639 640 // Delete the remaining (good) base class specifiers, since their 641 // data has been copied into the CXXRecordDecl. 642 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 643 Context.Deallocate(Bases[idx]); 644 645 return Invalid; 646} 647 648/// ActOnBaseSpecifiers - Attach the given base specifiers to the 649/// class, after checking whether there are any duplicate base 650/// classes. 651void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 652 unsigned NumBases) { 653 if (!ClassDecl || !Bases || !NumBases) 654 return; 655 656 AdjustDeclIfTemplate(ClassDecl); 657 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 658 (CXXBaseSpecifier**)(Bases), NumBases); 659} 660 661/// \brief Determine whether the type \p Derived is a C++ class that is 662/// derived from the type \p Base. 663bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 664 if (!getLangOptions().CPlusPlus) 665 return false; 666 667 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 668 if (!DerivedRT) 669 return false; 670 671 const RecordType *BaseRT = Base->getAs<RecordType>(); 672 if (!BaseRT) 673 return false; 674 675 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 676 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 677 return DerivedRD->isDerivedFrom(BaseRD); 678} 679 680/// \brief Determine whether the type \p Derived is a C++ class that is 681/// derived from the type \p Base. 682bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 683 if (!getLangOptions().CPlusPlus) 684 return false; 685 686 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 687 if (!DerivedRT) 688 return false; 689 690 const RecordType *BaseRT = Base->getAs<RecordType>(); 691 if (!BaseRT) 692 return false; 693 694 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 695 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 696 return DerivedRD->isDerivedFrom(BaseRD, Paths); 697} 698 699/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 700/// conversion (where Derived and Base are class types) is 701/// well-formed, meaning that the conversion is unambiguous (and 702/// that all of the base classes are accessible). Returns true 703/// and emits a diagnostic if the code is ill-formed, returns false 704/// otherwise. Loc is the location where this routine should point to 705/// if there is an error, and Range is the source range to highlight 706/// if there is an error. 707bool 708Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 709 unsigned InaccessibleBaseID, 710 unsigned AmbigiousBaseConvID, 711 SourceLocation Loc, SourceRange Range, 712 DeclarationName Name) { 713 // First, determine whether the path from Derived to Base is 714 // ambiguous. This is slightly more expensive than checking whether 715 // the Derived to Base conversion exists, because here we need to 716 // explore multiple paths to determine if there is an ambiguity. 717 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 718 /*DetectVirtual=*/false); 719 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 720 assert(DerivationOkay && 721 "Can only be used with a derived-to-base conversion"); 722 (void)DerivationOkay; 723 724 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 725 if (InaccessibleBaseID == 0) 726 return false; 727 // Check that the base class can be accessed. 728 return CheckBaseClassAccess(Derived, Base, InaccessibleBaseID, Paths, Loc, 729 Name); 730 } 731 732 // We know that the derived-to-base conversion is ambiguous, and 733 // we're going to produce a diagnostic. Perform the derived-to-base 734 // search just one more time to compute all of the possible paths so 735 // that we can print them out. This is more expensive than any of 736 // the previous derived-to-base checks we've done, but at this point 737 // performance isn't as much of an issue. 738 Paths.clear(); 739 Paths.setRecordingPaths(true); 740 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 741 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 742 (void)StillOkay; 743 744 // Build up a textual representation of the ambiguous paths, e.g., 745 // D -> B -> A, that will be used to illustrate the ambiguous 746 // conversions in the diagnostic. We only print one of the paths 747 // to each base class subobject. 748 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 749 750 Diag(Loc, AmbigiousBaseConvID) 751 << Derived << Base << PathDisplayStr << Range << Name; 752 return true; 753} 754 755bool 756Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 757 SourceLocation Loc, SourceRange Range, 758 bool IgnoreAccess) { 759 return CheckDerivedToBaseConversion(Derived, Base, 760 IgnoreAccess ? 0 : 761 diag::err_conv_to_inaccessible_base, 762 diag::err_ambiguous_derived_to_base_conv, 763 Loc, Range, DeclarationName()); 764} 765 766 767/// @brief Builds a string representing ambiguous paths from a 768/// specific derived class to different subobjects of the same base 769/// class. 770/// 771/// This function builds a string that can be used in error messages 772/// to show the different paths that one can take through the 773/// inheritance hierarchy to go from the derived class to different 774/// subobjects of a base class. The result looks something like this: 775/// @code 776/// struct D -> struct B -> struct A 777/// struct D -> struct C -> struct A 778/// @endcode 779std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 780 std::string PathDisplayStr; 781 std::set<unsigned> DisplayedPaths; 782 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 783 Path != Paths.end(); ++Path) { 784 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 785 // We haven't displayed a path to this particular base 786 // class subobject yet. 787 PathDisplayStr += "\n "; 788 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 789 for (CXXBasePath::const_iterator Element = Path->begin(); 790 Element != Path->end(); ++Element) 791 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 792 } 793 } 794 795 return PathDisplayStr; 796} 797 798//===----------------------------------------------------------------------===// 799// C++ class member Handling 800//===----------------------------------------------------------------------===// 801 802/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 803/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 804/// bitfield width if there is one and 'InitExpr' specifies the initializer if 805/// any. 806Sema::DeclPtrTy 807Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 808 MultiTemplateParamsArg TemplateParameterLists, 809 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 810 bool Deleted) { 811 const DeclSpec &DS = D.getDeclSpec(); 812 DeclarationName Name = GetNameForDeclarator(D); 813 Expr *BitWidth = static_cast<Expr*>(BW); 814 Expr *Init = static_cast<Expr*>(InitExpr); 815 SourceLocation Loc = D.getIdentifierLoc(); 816 817 bool isFunc = D.isFunctionDeclarator(); 818 819 assert(!DS.isFriendSpecified()); 820 821 // C++ 9.2p6: A member shall not be declared to have automatic storage 822 // duration (auto, register) or with the extern storage-class-specifier. 823 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 824 // data members and cannot be applied to names declared const or static, 825 // and cannot be applied to reference members. 826 switch (DS.getStorageClassSpec()) { 827 case DeclSpec::SCS_unspecified: 828 case DeclSpec::SCS_typedef: 829 case DeclSpec::SCS_static: 830 // FALL THROUGH. 831 break; 832 case DeclSpec::SCS_mutable: 833 if (isFunc) { 834 if (DS.getStorageClassSpecLoc().isValid()) 835 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 836 else 837 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 838 839 // FIXME: It would be nicer if the keyword was ignored only for this 840 // declarator. Otherwise we could get follow-up errors. 841 D.getMutableDeclSpec().ClearStorageClassSpecs(); 842 } else { 843 QualType T = GetTypeForDeclarator(D, S); 844 diag::kind err = static_cast<diag::kind>(0); 845 if (T->isReferenceType()) 846 err = diag::err_mutable_reference; 847 else if (T.isConstQualified()) 848 err = diag::err_mutable_const; 849 if (err != 0) { 850 if (DS.getStorageClassSpecLoc().isValid()) 851 Diag(DS.getStorageClassSpecLoc(), err); 852 else 853 Diag(DS.getThreadSpecLoc(), err); 854 // FIXME: It would be nicer if the keyword was ignored only for this 855 // declarator. Otherwise we could get follow-up errors. 856 D.getMutableDeclSpec().ClearStorageClassSpecs(); 857 } 858 } 859 break; 860 default: 861 if (DS.getStorageClassSpecLoc().isValid()) 862 Diag(DS.getStorageClassSpecLoc(), 863 diag::err_storageclass_invalid_for_member); 864 else 865 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 866 D.getMutableDeclSpec().ClearStorageClassSpecs(); 867 } 868 869 if (!isFunc && 870 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 871 D.getNumTypeObjects() == 0) { 872 // Check also for this case: 873 // 874 // typedef int f(); 875 // f a; 876 // 877 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 878 isFunc = TDType->isFunctionType(); 879 } 880 881 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 882 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 883 !isFunc); 884 885 Decl *Member; 886 if (isInstField) { 887 // FIXME: Check for template parameters! 888 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 889 AS); 890 assert(Member && "HandleField never returns null"); 891 } else { 892 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 893 .getAs<Decl>(); 894 if (!Member) { 895 if (BitWidth) DeleteExpr(BitWidth); 896 return DeclPtrTy(); 897 } 898 899 // Non-instance-fields can't have a bitfield. 900 if (BitWidth) { 901 if (Member->isInvalidDecl()) { 902 // don't emit another diagnostic. 903 } else if (isa<VarDecl>(Member)) { 904 // C++ 9.6p3: A bit-field shall not be a static member. 905 // "static member 'A' cannot be a bit-field" 906 Diag(Loc, diag::err_static_not_bitfield) 907 << Name << BitWidth->getSourceRange(); 908 } else if (isa<TypedefDecl>(Member)) { 909 // "typedef member 'x' cannot be a bit-field" 910 Diag(Loc, diag::err_typedef_not_bitfield) 911 << Name << BitWidth->getSourceRange(); 912 } else { 913 // A function typedef ("typedef int f(); f a;"). 914 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 915 Diag(Loc, diag::err_not_integral_type_bitfield) 916 << Name << cast<ValueDecl>(Member)->getType() 917 << BitWidth->getSourceRange(); 918 } 919 920 DeleteExpr(BitWidth); 921 BitWidth = 0; 922 Member->setInvalidDecl(); 923 } 924 925 Member->setAccess(AS); 926 927 // If we have declared a member function template, set the access of the 928 // templated declaration as well. 929 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 930 FunTmpl->getTemplatedDecl()->setAccess(AS); 931 } 932 933 assert((Name || isInstField) && "No identifier for non-field ?"); 934 935 if (Init) 936 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 937 if (Deleted) // FIXME: Source location is not very good. 938 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 939 940 if (isInstField) { 941 FieldCollector->Add(cast<FieldDecl>(Member)); 942 return DeclPtrTy(); 943 } 944 return DeclPtrTy::make(Member); 945} 946 947/// ActOnMemInitializer - Handle a C++ member initializer. 948Sema::MemInitResult 949Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 950 Scope *S, 951 const CXXScopeSpec &SS, 952 IdentifierInfo *MemberOrBase, 953 TypeTy *TemplateTypeTy, 954 SourceLocation IdLoc, 955 SourceLocation LParenLoc, 956 ExprTy **Args, unsigned NumArgs, 957 SourceLocation *CommaLocs, 958 SourceLocation RParenLoc) { 959 if (!ConstructorD) 960 return true; 961 962 AdjustDeclIfTemplate(ConstructorD); 963 964 CXXConstructorDecl *Constructor 965 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 966 if (!Constructor) { 967 // The user wrote a constructor initializer on a function that is 968 // not a C++ constructor. Ignore the error for now, because we may 969 // have more member initializers coming; we'll diagnose it just 970 // once in ActOnMemInitializers. 971 return true; 972 } 973 974 CXXRecordDecl *ClassDecl = Constructor->getParent(); 975 976 // C++ [class.base.init]p2: 977 // Names in a mem-initializer-id are looked up in the scope of the 978 // constructor’s class and, if not found in that scope, are looked 979 // up in the scope containing the constructor’s 980 // definition. [Note: if the constructor’s class contains a member 981 // with the same name as a direct or virtual base class of the 982 // class, a mem-initializer-id naming the member or base class and 983 // composed of a single identifier refers to the class member. A 984 // mem-initializer-id for the hidden base class may be specified 985 // using a qualified name. ] 986 if (!SS.getScopeRep() && !TemplateTypeTy) { 987 // Look for a member, first. 988 FieldDecl *Member = 0; 989 DeclContext::lookup_result Result 990 = ClassDecl->lookup(MemberOrBase); 991 if (Result.first != Result.second) 992 Member = dyn_cast<FieldDecl>(*Result.first); 993 994 // FIXME: Handle members of an anonymous union. 995 996 if (Member) 997 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 998 LParenLoc, RParenLoc); 999 } 1000 // It didn't name a member, so see if it names a class. 1001 QualType BaseType; 1002 1003 TypeSourceInfo *TInfo = 0; 1004 if (TemplateTypeTy) 1005 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1006 else 1007 BaseType = QualType::getFromOpaquePtr(getTypeName(*MemberOrBase, IdLoc, 1008 S, &SS)); 1009 if (BaseType.isNull()) 1010 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1011 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1012 1013 if (!TInfo) 1014 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1015 1016 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1017 LParenLoc, RParenLoc, ClassDecl); 1018} 1019 1020/// Checks an initializer expression for use of uninitialized fields, such as 1021/// containing the field that is being initialized. Returns true if there is an 1022/// uninitialized field was used an updates the SourceLocation parameter; false 1023/// otherwise. 1024static bool InitExprContainsUninitializedFields(const Stmt* S, 1025 const FieldDecl* LhsField, 1026 SourceLocation* L) { 1027 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1028 if (ME) { 1029 const NamedDecl* RhsField = ME->getMemberDecl(); 1030 if (RhsField == LhsField) { 1031 // Initializing a field with itself. Throw a warning. 1032 // But wait; there are exceptions! 1033 // Exception #1: The field may not belong to this record. 1034 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1035 const Expr* base = ME->getBase(); 1036 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1037 // Even though the field matches, it does not belong to this record. 1038 return false; 1039 } 1040 // None of the exceptions triggered; return true to indicate an 1041 // uninitialized field was used. 1042 *L = ME->getMemberLoc(); 1043 return true; 1044 } 1045 } 1046 bool found = false; 1047 for (Stmt::const_child_iterator it = S->child_begin(); 1048 it != S->child_end() && found == false; 1049 ++it) { 1050 if (isa<CallExpr>(S)) { 1051 // Do not descend into function calls or constructors, as the use 1052 // of an uninitialized field may be valid. One would have to inspect 1053 // the contents of the function/ctor to determine if it is safe or not. 1054 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1055 // may be safe, depending on what the function/ctor does. 1056 continue; 1057 } 1058 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1059 } 1060 return found; 1061} 1062 1063Sema::MemInitResult 1064Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1065 unsigned NumArgs, SourceLocation IdLoc, 1066 SourceLocation LParenLoc, 1067 SourceLocation RParenLoc) { 1068 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1069 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1070 ExprTemporaries.clear(); 1071 1072 // Diagnose value-uses of fields to initialize themselves, e.g. 1073 // foo(foo) 1074 // where foo is not also a parameter to the constructor. 1075 // TODO: implement -Wuninitialized and fold this into that framework. 1076 for (unsigned i = 0; i < NumArgs; ++i) { 1077 SourceLocation L; 1078 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1079 // FIXME: Return true in the case when other fields are used before being 1080 // uninitialized. For example, let this field be the i'th field. When 1081 // initializing the i'th field, throw a warning if any of the >= i'th 1082 // fields are used, as they are not yet initialized. 1083 // Right now we are only handling the case where the i'th field uses 1084 // itself in its initializer. 1085 Diag(L, diag::warn_field_is_uninit); 1086 } 1087 } 1088 1089 bool HasDependentArg = false; 1090 for (unsigned i = 0; i < NumArgs; i++) 1091 HasDependentArg |= Args[i]->isTypeDependent(); 1092 1093 CXXConstructorDecl *C = 0; 1094 QualType FieldType = Member->getType(); 1095 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1096 FieldType = Array->getElementType(); 1097 if (FieldType->isDependentType()) { 1098 // Can't check init for dependent type. 1099 } else if (FieldType->isRecordType()) { 1100 // Member is a record (struct/union/class), so pass the initializer 1101 // arguments down to the record's constructor. 1102 if (!HasDependentArg) { 1103 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1104 1105 C = PerformInitializationByConstructor(FieldType, 1106 MultiExprArg(*this, 1107 (void**)Args, 1108 NumArgs), 1109 IdLoc, 1110 SourceRange(IdLoc, RParenLoc), 1111 Member->getDeclName(), IK_Direct, 1112 ConstructorArgs); 1113 1114 if (C) { 1115 // Take over the constructor arguments as our own. 1116 NumArgs = ConstructorArgs.size(); 1117 Args = (Expr **)ConstructorArgs.take(); 1118 } 1119 } 1120 } else if (NumArgs != 1 && NumArgs != 0) { 1121 // The member type is not a record type (or an array of record 1122 // types), so it can be only be default- or copy-initialized. 1123 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 1124 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 1125 } else if (!HasDependentArg) { 1126 Expr *NewExp; 1127 if (NumArgs == 0) { 1128 if (FieldType->isReferenceType()) { 1129 Diag(IdLoc, diag::err_null_intialized_reference_member) 1130 << Member->getDeclName(); 1131 return Diag(Member->getLocation(), diag::note_declared_at); 1132 } 1133 NewExp = new (Context) CXXZeroInitValueExpr(FieldType, IdLoc, RParenLoc); 1134 NumArgs = 1; 1135 } 1136 else 1137 NewExp = (Expr*)Args[0]; 1138 if (PerformCopyInitialization(NewExp, FieldType, "passing")) 1139 return true; 1140 Args[0] = NewExp; 1141 } 1142 1143 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1144 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1145 ExprTemporaries.clear(); 1146 1147 // FIXME: Perform direct initialization of the member. 1148 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1149 C, LParenLoc, (Expr **)Args, 1150 NumArgs, RParenLoc); 1151} 1152 1153Sema::MemInitResult 1154Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1155 Expr **Args, unsigned NumArgs, 1156 SourceLocation LParenLoc, SourceLocation RParenLoc, 1157 CXXRecordDecl *ClassDecl) { 1158 bool HasDependentArg = false; 1159 for (unsigned i = 0; i < NumArgs; i++) 1160 HasDependentArg |= Args[i]->isTypeDependent(); 1161 1162 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1163 if (!BaseType->isDependentType()) { 1164 if (!BaseType->isRecordType()) 1165 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1166 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1167 1168 // C++ [class.base.init]p2: 1169 // [...] Unless the mem-initializer-id names a nonstatic data 1170 // member of the constructor’s class or a direct or virtual base 1171 // of that class, the mem-initializer is ill-formed. A 1172 // mem-initializer-list can initialize a base class using any 1173 // name that denotes that base class type. 1174 1175 // First, check for a direct base class. 1176 const CXXBaseSpecifier *DirectBaseSpec = 0; 1177 for (CXXRecordDecl::base_class_const_iterator Base = 1178 ClassDecl->bases_begin(); Base != ClassDecl->bases_end(); ++Base) { 1179 if (Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1180 // We found a direct base of this type. That's what we're 1181 // initializing. 1182 DirectBaseSpec = &*Base; 1183 break; 1184 } 1185 } 1186 1187 // Check for a virtual base class. 1188 // FIXME: We might be able to short-circuit this if we know in advance that 1189 // there are no virtual bases. 1190 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1191 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1192 // We haven't found a base yet; search the class hierarchy for a 1193 // virtual base class. 1194 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1195 /*DetectVirtual=*/false); 1196 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 1197 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1198 Path != Paths.end(); ++Path) { 1199 if (Path->back().Base->isVirtual()) { 1200 VirtualBaseSpec = Path->back().Base; 1201 break; 1202 } 1203 } 1204 } 1205 } 1206 1207 // C++ [base.class.init]p2: 1208 // If a mem-initializer-id is ambiguous because it designates both 1209 // a direct non-virtual base class and an inherited virtual base 1210 // class, the mem-initializer is ill-formed. 1211 if (DirectBaseSpec && VirtualBaseSpec) 1212 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1213 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1214 // C++ [base.class.init]p2: 1215 // Unless the mem-initializer-id names a nonstatic data membeer of the 1216 // constructor's class ot a direst or virtual base of that class, the 1217 // mem-initializer is ill-formed. 1218 if (!DirectBaseSpec && !VirtualBaseSpec) 1219 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1220 << BaseType << ClassDecl->getNameAsCString() 1221 << BaseTInfo->getTypeLoc().getSourceRange(); 1222 } 1223 1224 CXXConstructorDecl *C = 0; 1225 if (!BaseType->isDependentType() && !HasDependentArg) { 1226 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 1227 Context.getCanonicalType(BaseType).getUnqualifiedType()); 1228 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1229 1230 C = PerformInitializationByConstructor(BaseType, 1231 MultiExprArg(*this, 1232 (void**)Args, NumArgs), 1233 BaseLoc, 1234 SourceRange(BaseLoc, RParenLoc), 1235 Name, IK_Direct, 1236 ConstructorArgs); 1237 if (C) { 1238 // Take over the constructor arguments as our own. 1239 NumArgs = ConstructorArgs.size(); 1240 Args = (Expr **)ConstructorArgs.take(); 1241 } 1242 } 1243 1244 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1245 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1246 ExprTemporaries.clear(); 1247 1248 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, C, 1249 LParenLoc, (Expr **)Args, 1250 NumArgs, RParenLoc); 1251} 1252 1253bool 1254Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1255 CXXBaseOrMemberInitializer **Initializers, 1256 unsigned NumInitializers, 1257 bool IsImplicitConstructor) { 1258 // We need to build the initializer AST according to order of construction 1259 // and not what user specified in the Initializers list. 1260 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1261 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1262 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1263 bool HasDependentBaseInit = false; 1264 bool HadError = false; 1265 1266 for (unsigned i = 0; i < NumInitializers; i++) { 1267 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1268 if (Member->isBaseInitializer()) { 1269 if (Member->getBaseClass()->isDependentType()) 1270 HasDependentBaseInit = true; 1271 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1272 } else { 1273 AllBaseFields[Member->getMember()] = Member; 1274 } 1275 } 1276 1277 if (HasDependentBaseInit) { 1278 // FIXME. This does not preserve the ordering of the initializers. 1279 // Try (with -Wreorder) 1280 // template<class X> struct A {}; 1281 // template<class X> struct B : A<X> { 1282 // B() : x1(10), A<X>() {} 1283 // int x1; 1284 // }; 1285 // B<int> x; 1286 // On seeing one dependent type, we should essentially exit this routine 1287 // while preserving user-declared initializer list. When this routine is 1288 // called during instantiatiation process, this routine will rebuild the 1289 // ordered initializer list correctly. 1290 1291 // If we have a dependent base initialization, we can't determine the 1292 // association between initializers and bases; just dump the known 1293 // initializers into the list, and don't try to deal with other bases. 1294 for (unsigned i = 0; i < NumInitializers; i++) { 1295 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1296 if (Member->isBaseInitializer()) 1297 AllToInit.push_back(Member); 1298 } 1299 } else { 1300 // Push virtual bases before others. 1301 for (CXXRecordDecl::base_class_iterator VBase = 1302 ClassDecl->vbases_begin(), 1303 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1304 if (VBase->getType()->isDependentType()) 1305 continue; 1306 if (CXXBaseOrMemberInitializer *Value 1307 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1308 AllToInit.push_back(Value); 1309 } 1310 else { 1311 CXXRecordDecl *VBaseDecl = 1312 cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1313 assert(VBaseDecl && "SetBaseOrMemberInitializers - VBaseDecl null"); 1314 CXXConstructorDecl *Ctor = VBaseDecl->getDefaultConstructor(Context); 1315 if (!Ctor) { 1316 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1317 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1318 << 0 << VBase->getType(); 1319 Diag(VBaseDecl->getLocation(), diag::note_previous_decl) 1320 << Context.getTagDeclType(VBaseDecl); 1321 HadError = true; 1322 continue; 1323 } 1324 1325 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1326 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1327 Constructor->getLocation(), CtorArgs)) 1328 continue; 1329 1330 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1331 1332 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1333 // subexpression so we can wrap it in a CXXExprWithTemporaries if 1334 // necessary. 1335 // FIXME: Is there any better source-location information we can give? 1336 ExprTemporaries.clear(); 1337 CXXBaseOrMemberInitializer *Member = 1338 new (Context) CXXBaseOrMemberInitializer(Context, 1339 Context.getTrivialTypeSourceInfo(VBase->getType(), 1340 SourceLocation()), 1341 Ctor, 1342 SourceLocation(), 1343 CtorArgs.takeAs<Expr>(), 1344 CtorArgs.size(), 1345 SourceLocation()); 1346 AllToInit.push_back(Member); 1347 } 1348 } 1349 1350 for (CXXRecordDecl::base_class_iterator Base = 1351 ClassDecl->bases_begin(), 1352 E = ClassDecl->bases_end(); Base != E; ++Base) { 1353 // Virtuals are in the virtual base list and already constructed. 1354 if (Base->isVirtual()) 1355 continue; 1356 // Skip dependent types. 1357 if (Base->getType()->isDependentType()) 1358 continue; 1359 if (CXXBaseOrMemberInitializer *Value 1360 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1361 AllToInit.push_back(Value); 1362 } 1363 else { 1364 CXXRecordDecl *BaseDecl = 1365 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1366 assert(BaseDecl && "SetBaseOrMemberInitializers - BaseDecl null"); 1367 CXXConstructorDecl *Ctor = BaseDecl->getDefaultConstructor(Context); 1368 if (!Ctor) { 1369 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1370 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1371 << 0 << Base->getType(); 1372 Diag(BaseDecl->getLocation(), diag::note_previous_decl) 1373 << Context.getTagDeclType(BaseDecl); 1374 HadError = true; 1375 continue; 1376 } 1377 1378 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1379 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1380 Constructor->getLocation(), CtorArgs)) 1381 continue; 1382 1383 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1384 1385 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1386 // subexpression so we can wrap it in a CXXExprWithTemporaries if 1387 // necessary. 1388 // FIXME: Is there any better source-location information we can give? 1389 ExprTemporaries.clear(); 1390 CXXBaseOrMemberInitializer *Member = 1391 new (Context) CXXBaseOrMemberInitializer(Context, 1392 Context.getTrivialTypeSourceInfo(Base->getType(), 1393 SourceLocation()), 1394 Ctor, 1395 SourceLocation(), 1396 CtorArgs.takeAs<Expr>(), 1397 CtorArgs.size(), 1398 SourceLocation()); 1399 AllToInit.push_back(Member); 1400 } 1401 } 1402 } 1403 1404 // non-static data members. 1405 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1406 E = ClassDecl->field_end(); Field != E; ++Field) { 1407 if ((*Field)->isAnonymousStructOrUnion()) { 1408 if (const RecordType *FieldClassType = 1409 Field->getType()->getAs<RecordType>()) { 1410 CXXRecordDecl *FieldClassDecl 1411 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1412 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1413 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1414 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1415 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1416 // set to the anonymous union data member used in the initializer 1417 // list. 1418 Value->setMember(*Field); 1419 Value->setAnonUnionMember(*FA); 1420 AllToInit.push_back(Value); 1421 break; 1422 } 1423 } 1424 } 1425 continue; 1426 } 1427 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1428 AllToInit.push_back(Value); 1429 continue; 1430 } 1431 1432 if ((*Field)->getType()->isDependentType()) 1433 continue; 1434 1435 QualType FT = Context.getBaseElementType((*Field)->getType()); 1436 if (const RecordType* RT = FT->getAs<RecordType>()) { 1437 CXXConstructorDecl *Ctor = 1438 cast<CXXRecordDecl>(RT->getDecl())->getDefaultConstructor(Context); 1439 if (!Ctor) { 1440 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1441 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1442 << 1 << (*Field)->getDeclName(); 1443 Diag(Field->getLocation(), diag::note_field_decl); 1444 Diag(RT->getDecl()->getLocation(), diag::note_previous_decl) 1445 << Context.getTagDeclType(RT->getDecl()); 1446 HadError = true; 1447 continue; 1448 } 1449 1450 if (FT.isConstQualified() && Ctor->isTrivial()) { 1451 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1452 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1453 << 1 << (*Field)->getDeclName(); 1454 Diag((*Field)->getLocation(), diag::note_declared_at); 1455 HadError = true; 1456 } 1457 1458 // Don't create initializers for trivial constructors, since they don't 1459 // actually need to be run. 1460 if (Ctor->isTrivial()) 1461 continue; 1462 1463 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1464 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1465 Constructor->getLocation(), CtorArgs)) 1466 continue; 1467 1468 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1469 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1470 ExprTemporaries.clear(); 1471 CXXBaseOrMemberInitializer *Member = 1472 new (Context) CXXBaseOrMemberInitializer(Context, 1473 *Field, SourceLocation(), 1474 Ctor, 1475 SourceLocation(), 1476 CtorArgs.takeAs<Expr>(), 1477 CtorArgs.size(), 1478 SourceLocation()); 1479 1480 AllToInit.push_back(Member); 1481 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1482 } 1483 else if (FT->isReferenceType()) { 1484 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1485 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1486 << 0 << (*Field)->getDeclName(); 1487 Diag((*Field)->getLocation(), diag::note_declared_at); 1488 HadError = true; 1489 } 1490 else if (FT.isConstQualified()) { 1491 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1492 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1493 << 1 << (*Field)->getDeclName(); 1494 Diag((*Field)->getLocation(), diag::note_declared_at); 1495 HadError = true; 1496 } 1497 } 1498 1499 NumInitializers = AllToInit.size(); 1500 if (NumInitializers > 0) { 1501 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1502 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1503 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1504 1505 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1506 for (unsigned Idx = 0; Idx < NumInitializers; ++Idx) 1507 baseOrMemberInitializers[Idx] = AllToInit[Idx]; 1508 } 1509 1510 return HadError; 1511} 1512 1513static void *GetKeyForTopLevelField(FieldDecl *Field) { 1514 // For anonymous unions, use the class declaration as the key. 1515 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1516 if (RT->getDecl()->isAnonymousStructOrUnion()) 1517 return static_cast<void *>(RT->getDecl()); 1518 } 1519 return static_cast<void *>(Field); 1520} 1521 1522static void *GetKeyForBase(QualType BaseType) { 1523 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1524 return (void *)RT; 1525 1526 assert(0 && "Unexpected base type!"); 1527 return 0; 1528} 1529 1530static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1531 bool MemberMaybeAnon = false) { 1532 // For fields injected into the class via declaration of an anonymous union, 1533 // use its anonymous union class declaration as the unique key. 1534 if (Member->isMemberInitializer()) { 1535 FieldDecl *Field = Member->getMember(); 1536 1537 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1538 // data member of the class. Data member used in the initializer list is 1539 // in AnonUnionMember field. 1540 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1541 Field = Member->getAnonUnionMember(); 1542 if (Field->getDeclContext()->isRecord()) { 1543 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 1544 if (RD->isAnonymousStructOrUnion()) 1545 return static_cast<void *>(RD); 1546 } 1547 return static_cast<void *>(Field); 1548 } 1549 1550 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1551} 1552 1553/// ActOnMemInitializers - Handle the member initializers for a constructor. 1554void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1555 SourceLocation ColonLoc, 1556 MemInitTy **MemInits, unsigned NumMemInits) { 1557 if (!ConstructorDecl) 1558 return; 1559 1560 AdjustDeclIfTemplate(ConstructorDecl); 1561 1562 CXXConstructorDecl *Constructor 1563 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1564 1565 if (!Constructor) { 1566 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1567 return; 1568 } 1569 1570 if (!Constructor->isDependentContext()) { 1571 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 1572 bool err = false; 1573 for (unsigned i = 0; i < NumMemInits; i++) { 1574 CXXBaseOrMemberInitializer *Member = 1575 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1576 void *KeyToMember = GetKeyForMember(Member); 1577 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1578 if (!PrevMember) { 1579 PrevMember = Member; 1580 continue; 1581 } 1582 if (FieldDecl *Field = Member->getMember()) 1583 Diag(Member->getSourceLocation(), 1584 diag::error_multiple_mem_initialization) 1585 << Field->getNameAsString() 1586 << Member->getSourceRange(); 1587 else { 1588 Type *BaseClass = Member->getBaseClass(); 1589 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1590 Diag(Member->getSourceLocation(), 1591 diag::error_multiple_base_initialization) 1592 << QualType(BaseClass, 0) 1593 << Member->getSourceRange(); 1594 } 1595 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1596 << 0; 1597 err = true; 1598 } 1599 1600 if (err) 1601 return; 1602 } 1603 1604 SetBaseOrMemberInitializers(Constructor, 1605 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 1606 NumMemInits, false); 1607 1608 if (Constructor->isDependentContext()) 1609 return; 1610 1611 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1612 Diagnostic::Ignored && 1613 Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1614 Diagnostic::Ignored) 1615 return; 1616 1617 // Also issue warning if order of ctor-initializer list does not match order 1618 // of 1) base class declarations and 2) order of non-static data members. 1619 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1620 1621 CXXRecordDecl *ClassDecl 1622 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1623 // Push virtual bases before others. 1624 for (CXXRecordDecl::base_class_iterator VBase = 1625 ClassDecl->vbases_begin(), 1626 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1627 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1628 1629 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1630 E = ClassDecl->bases_end(); Base != E; ++Base) { 1631 // Virtuals are alread in the virtual base list and are constructed 1632 // first. 1633 if (Base->isVirtual()) 1634 continue; 1635 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1636 } 1637 1638 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1639 E = ClassDecl->field_end(); Field != E; ++Field) 1640 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1641 1642 int Last = AllBaseOrMembers.size(); 1643 int curIndex = 0; 1644 CXXBaseOrMemberInitializer *PrevMember = 0; 1645 for (unsigned i = 0; i < NumMemInits; i++) { 1646 CXXBaseOrMemberInitializer *Member = 1647 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1648 void *MemberInCtorList = GetKeyForMember(Member, true); 1649 1650 for (; curIndex < Last; curIndex++) 1651 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1652 break; 1653 if (curIndex == Last) { 1654 assert(PrevMember && "Member not in member list?!"); 1655 // Initializer as specified in ctor-initializer list is out of order. 1656 // Issue a warning diagnostic. 1657 if (PrevMember->isBaseInitializer()) { 1658 // Diagnostics is for an initialized base class. 1659 Type *BaseClass = PrevMember->getBaseClass(); 1660 Diag(PrevMember->getSourceLocation(), 1661 diag::warn_base_initialized) 1662 << QualType(BaseClass, 0); 1663 } else { 1664 FieldDecl *Field = PrevMember->getMember(); 1665 Diag(PrevMember->getSourceLocation(), 1666 diag::warn_field_initialized) 1667 << Field->getNameAsString(); 1668 } 1669 // Also the note! 1670 if (FieldDecl *Field = Member->getMember()) 1671 Diag(Member->getSourceLocation(), 1672 diag::note_fieldorbase_initialized_here) << 0 1673 << Field->getNameAsString(); 1674 else { 1675 Type *BaseClass = Member->getBaseClass(); 1676 Diag(Member->getSourceLocation(), 1677 diag::note_fieldorbase_initialized_here) << 1 1678 << QualType(BaseClass, 0); 1679 } 1680 for (curIndex = 0; curIndex < Last; curIndex++) 1681 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1682 break; 1683 } 1684 PrevMember = Member; 1685 } 1686} 1687 1688void 1689Sema::MarkBaseAndMemberDestructorsReferenced(CXXDestructorDecl *Destructor) { 1690 // Ignore dependent destructors. 1691 if (Destructor->isDependentContext()) 1692 return; 1693 1694 CXXRecordDecl *ClassDecl = Destructor->getParent(); 1695 1696 // Non-static data members. 1697 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1698 E = ClassDecl->field_end(); I != E; ++I) { 1699 FieldDecl *Field = *I; 1700 1701 QualType FieldType = Context.getBaseElementType(Field->getType()); 1702 1703 const RecordType* RT = FieldType->getAs<RecordType>(); 1704 if (!RT) 1705 continue; 1706 1707 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1708 if (FieldClassDecl->hasTrivialDestructor()) 1709 continue; 1710 1711 const CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1712 MarkDeclarationReferenced(Destructor->getLocation(), 1713 const_cast<CXXDestructorDecl*>(Dtor)); 1714 } 1715 1716 // Bases. 1717 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1718 E = ClassDecl->bases_end(); Base != E; ++Base) { 1719 // Ignore virtual bases. 1720 if (Base->isVirtual()) 1721 continue; 1722 1723 // Ignore trivial destructors. 1724 CXXRecordDecl *BaseClassDecl 1725 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1726 if (BaseClassDecl->hasTrivialDestructor()) 1727 continue; 1728 1729 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1730 MarkDeclarationReferenced(Destructor->getLocation(), 1731 const_cast<CXXDestructorDecl*>(Dtor)); 1732 } 1733 1734 // Virtual bases. 1735 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1736 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1737 // Ignore trivial destructors. 1738 CXXRecordDecl *BaseClassDecl 1739 = cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1740 if (BaseClassDecl->hasTrivialDestructor()) 1741 continue; 1742 1743 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1744 MarkDeclarationReferenced(Destructor->getLocation(), 1745 const_cast<CXXDestructorDecl*>(Dtor)); 1746 } 1747} 1748 1749void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1750 if (!CDtorDecl) 1751 return; 1752 1753 AdjustDeclIfTemplate(CDtorDecl); 1754 1755 if (CXXConstructorDecl *Constructor 1756 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1757 SetBaseOrMemberInitializers(Constructor, 0, 0, false); 1758} 1759 1760namespace { 1761 /// PureVirtualMethodCollector - traverses a class and its superclasses 1762 /// and determines if it has any pure virtual methods. 1763 class PureVirtualMethodCollector { 1764 ASTContext &Context; 1765 1766 public: 1767 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1768 1769 private: 1770 MethodList Methods; 1771 1772 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1773 1774 public: 1775 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1776 : Context(Ctx) { 1777 1778 MethodList List; 1779 Collect(RD, List); 1780 1781 // Copy the temporary list to methods, and make sure to ignore any 1782 // null entries. 1783 for (size_t i = 0, e = List.size(); i != e; ++i) { 1784 if (List[i]) 1785 Methods.push_back(List[i]); 1786 } 1787 } 1788 1789 bool empty() const { return Methods.empty(); } 1790 1791 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1792 MethodList::const_iterator methods_end() { return Methods.end(); } 1793 }; 1794 1795 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1796 MethodList& Methods) { 1797 // First, collect the pure virtual methods for the base classes. 1798 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1799 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1800 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1801 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1802 if (BaseDecl && BaseDecl->isAbstract()) 1803 Collect(BaseDecl, Methods); 1804 } 1805 } 1806 1807 // Next, zero out any pure virtual methods that this class overrides. 1808 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1809 1810 MethodSetTy OverriddenMethods; 1811 size_t MethodsSize = Methods.size(); 1812 1813 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1814 i != e; ++i) { 1815 // Traverse the record, looking for methods. 1816 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1817 // If the method is pure virtual, add it to the methods vector. 1818 if (MD->isPure()) 1819 Methods.push_back(MD); 1820 1821 // Record all the overridden methods in our set. 1822 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1823 E = MD->end_overridden_methods(); I != E; ++I) { 1824 // Keep track of the overridden methods. 1825 OverriddenMethods.insert(*I); 1826 } 1827 } 1828 } 1829 1830 // Now go through the methods and zero out all the ones we know are 1831 // overridden. 1832 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1833 if (OverriddenMethods.count(Methods[i])) 1834 Methods[i] = 0; 1835 } 1836 1837 } 1838} 1839 1840 1841bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1842 unsigned DiagID, AbstractDiagSelID SelID, 1843 const CXXRecordDecl *CurrentRD) { 1844 if (SelID == -1) 1845 return RequireNonAbstractType(Loc, T, 1846 PDiag(DiagID), CurrentRD); 1847 else 1848 return RequireNonAbstractType(Loc, T, 1849 PDiag(DiagID) << SelID, CurrentRD); 1850} 1851 1852bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1853 const PartialDiagnostic &PD, 1854 const CXXRecordDecl *CurrentRD) { 1855 if (!getLangOptions().CPlusPlus) 1856 return false; 1857 1858 if (const ArrayType *AT = Context.getAsArrayType(T)) 1859 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 1860 CurrentRD); 1861 1862 if (const PointerType *PT = T->getAs<PointerType>()) { 1863 // Find the innermost pointer type. 1864 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1865 PT = T; 1866 1867 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1868 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 1869 } 1870 1871 const RecordType *RT = T->getAs<RecordType>(); 1872 if (!RT) 1873 return false; 1874 1875 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1876 if (!RD) 1877 return false; 1878 1879 if (CurrentRD && CurrentRD != RD) 1880 return false; 1881 1882 if (!RD->isAbstract()) 1883 return false; 1884 1885 Diag(Loc, PD) << RD->getDeclName(); 1886 1887 // Check if we've already emitted the list of pure virtual functions for this 1888 // class. 1889 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1890 return true; 1891 1892 PureVirtualMethodCollector Collector(Context, RD); 1893 1894 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1895 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1896 const CXXMethodDecl *MD = *I; 1897 1898 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1899 MD->getDeclName(); 1900 } 1901 1902 if (!PureVirtualClassDiagSet) 1903 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1904 PureVirtualClassDiagSet->insert(RD); 1905 1906 return true; 1907} 1908 1909namespace { 1910 class AbstractClassUsageDiagnoser 1911 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1912 Sema &SemaRef; 1913 CXXRecordDecl *AbstractClass; 1914 1915 bool VisitDeclContext(const DeclContext *DC) { 1916 bool Invalid = false; 1917 1918 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1919 E = DC->decls_end(); I != E; ++I) 1920 Invalid |= Visit(*I); 1921 1922 return Invalid; 1923 } 1924 1925 public: 1926 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1927 : SemaRef(SemaRef), AbstractClass(ac) { 1928 Visit(SemaRef.Context.getTranslationUnitDecl()); 1929 } 1930 1931 bool VisitFunctionDecl(const FunctionDecl *FD) { 1932 if (FD->isThisDeclarationADefinition()) { 1933 // No need to do the check if we're in a definition, because it requires 1934 // that the return/param types are complete. 1935 // because that requires 1936 return VisitDeclContext(FD); 1937 } 1938 1939 // Check the return type. 1940 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 1941 bool Invalid = 1942 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1943 diag::err_abstract_type_in_decl, 1944 Sema::AbstractReturnType, 1945 AbstractClass); 1946 1947 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1948 E = FD->param_end(); I != E; ++I) { 1949 const ParmVarDecl *VD = *I; 1950 Invalid |= 1951 SemaRef.RequireNonAbstractType(VD->getLocation(), 1952 VD->getOriginalType(), 1953 diag::err_abstract_type_in_decl, 1954 Sema::AbstractParamType, 1955 AbstractClass); 1956 } 1957 1958 return Invalid; 1959 } 1960 1961 bool VisitDecl(const Decl* D) { 1962 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1963 return VisitDeclContext(DC); 1964 1965 return false; 1966 } 1967 }; 1968} 1969 1970/// \brief Perform semantic checks on a class definition that has been 1971/// completing, introducing implicitly-declared members, checking for 1972/// abstract types, etc. 1973void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 1974 if (!Record || Record->isInvalidDecl()) 1975 return; 1976 1977 if (!Record->isAbstract()) { 1978 // Collect all the pure virtual methods and see if this is an abstract 1979 // class after all. 1980 PureVirtualMethodCollector Collector(Context, Record); 1981 if (!Collector.empty()) 1982 Record->setAbstract(true); 1983 } 1984 1985 if (Record->isAbstract()) 1986 (void)AbstractClassUsageDiagnoser(*this, Record); 1987 1988 if (!Record->isDependentType() && !Record->isInvalidDecl()) 1989 AddImplicitlyDeclaredMembersToClass(Record); 1990} 1991 1992void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1993 DeclPtrTy TagDecl, 1994 SourceLocation LBrac, 1995 SourceLocation RBrac) { 1996 if (!TagDecl) 1997 return; 1998 1999 AdjustDeclIfTemplate(TagDecl); 2000 2001 ActOnFields(S, RLoc, TagDecl, 2002 (DeclPtrTy*)FieldCollector->getCurFields(), 2003 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 2004 2005 CheckCompletedCXXClass( 2006 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2007} 2008 2009/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2010/// special functions, such as the default constructor, copy 2011/// constructor, or destructor, to the given C++ class (C++ 2012/// [special]p1). This routine can only be executed just before the 2013/// definition of the class is complete. 2014void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2015 CanQualType ClassType 2016 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2017 2018 // FIXME: Implicit declarations have exception specifications, which are 2019 // the union of the specifications of the implicitly called functions. 2020 2021 if (!ClassDecl->hasUserDeclaredConstructor()) { 2022 // C++ [class.ctor]p5: 2023 // A default constructor for a class X is a constructor of class X 2024 // that can be called without an argument. If there is no 2025 // user-declared constructor for class X, a default constructor is 2026 // implicitly declared. An implicitly-declared default constructor 2027 // is an inline public member of its class. 2028 DeclarationName Name 2029 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2030 CXXConstructorDecl *DefaultCon = 2031 CXXConstructorDecl::Create(Context, ClassDecl, 2032 ClassDecl->getLocation(), Name, 2033 Context.getFunctionType(Context.VoidTy, 2034 0, 0, false, 0), 2035 /*TInfo=*/0, 2036 /*isExplicit=*/false, 2037 /*isInline=*/true, 2038 /*isImplicitlyDeclared=*/true); 2039 DefaultCon->setAccess(AS_public); 2040 DefaultCon->setImplicit(); 2041 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2042 ClassDecl->addDecl(DefaultCon); 2043 } 2044 2045 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2046 // C++ [class.copy]p4: 2047 // If the class definition does not explicitly declare a copy 2048 // constructor, one is declared implicitly. 2049 2050 // C++ [class.copy]p5: 2051 // The implicitly-declared copy constructor for a class X will 2052 // have the form 2053 // 2054 // X::X(const X&) 2055 // 2056 // if 2057 bool HasConstCopyConstructor = true; 2058 2059 // -- each direct or virtual base class B of X has a copy 2060 // constructor whose first parameter is of type const B& or 2061 // const volatile B&, and 2062 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2063 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2064 const CXXRecordDecl *BaseClassDecl 2065 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2066 HasConstCopyConstructor 2067 = BaseClassDecl->hasConstCopyConstructor(Context); 2068 } 2069 2070 // -- for all the nonstatic data members of X that are of a 2071 // class type M (or array thereof), each such class type 2072 // has a copy constructor whose first parameter is of type 2073 // const M& or const volatile M&. 2074 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2075 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2076 ++Field) { 2077 QualType FieldType = (*Field)->getType(); 2078 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2079 FieldType = Array->getElementType(); 2080 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2081 const CXXRecordDecl *FieldClassDecl 2082 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2083 HasConstCopyConstructor 2084 = FieldClassDecl->hasConstCopyConstructor(Context); 2085 } 2086 } 2087 2088 // Otherwise, the implicitly declared copy constructor will have 2089 // the form 2090 // 2091 // X::X(X&) 2092 QualType ArgType = ClassType; 2093 if (HasConstCopyConstructor) 2094 ArgType = ArgType.withConst(); 2095 ArgType = Context.getLValueReferenceType(ArgType); 2096 2097 // An implicitly-declared copy constructor is an inline public 2098 // member of its class. 2099 DeclarationName Name 2100 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2101 CXXConstructorDecl *CopyConstructor 2102 = CXXConstructorDecl::Create(Context, ClassDecl, 2103 ClassDecl->getLocation(), Name, 2104 Context.getFunctionType(Context.VoidTy, 2105 &ArgType, 1, 2106 false, 0), 2107 /*TInfo=*/0, 2108 /*isExplicit=*/false, 2109 /*isInline=*/true, 2110 /*isImplicitlyDeclared=*/true); 2111 CopyConstructor->setAccess(AS_public); 2112 CopyConstructor->setImplicit(); 2113 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2114 2115 // Add the parameter to the constructor. 2116 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2117 ClassDecl->getLocation(), 2118 /*IdentifierInfo=*/0, 2119 ArgType, /*TInfo=*/0, 2120 VarDecl::None, 0); 2121 CopyConstructor->setParams(Context, &FromParam, 1); 2122 ClassDecl->addDecl(CopyConstructor); 2123 } 2124 2125 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2126 // Note: The following rules are largely analoguous to the copy 2127 // constructor rules. Note that virtual bases are not taken into account 2128 // for determining the argument type of the operator. Note also that 2129 // operators taking an object instead of a reference are allowed. 2130 // 2131 // C++ [class.copy]p10: 2132 // If the class definition does not explicitly declare a copy 2133 // assignment operator, one is declared implicitly. 2134 // The implicitly-defined copy assignment operator for a class X 2135 // will have the form 2136 // 2137 // X& X::operator=(const X&) 2138 // 2139 // if 2140 bool HasConstCopyAssignment = true; 2141 2142 // -- each direct base class B of X has a copy assignment operator 2143 // whose parameter is of type const B&, const volatile B& or B, 2144 // and 2145 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2146 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2147 assert(!Base->getType()->isDependentType() && 2148 "Cannot generate implicit members for class with dependent bases."); 2149 const CXXRecordDecl *BaseClassDecl 2150 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2151 const CXXMethodDecl *MD = 0; 2152 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2153 MD); 2154 } 2155 2156 // -- for all the nonstatic data members of X that are of a class 2157 // type M (or array thereof), each such class type has a copy 2158 // assignment operator whose parameter is of type const M&, 2159 // const volatile M& or M. 2160 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2161 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2162 ++Field) { 2163 QualType FieldType = (*Field)->getType(); 2164 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2165 FieldType = Array->getElementType(); 2166 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2167 const CXXRecordDecl *FieldClassDecl 2168 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2169 const CXXMethodDecl *MD = 0; 2170 HasConstCopyAssignment 2171 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2172 } 2173 } 2174 2175 // Otherwise, the implicitly declared copy assignment operator will 2176 // have the form 2177 // 2178 // X& X::operator=(X&) 2179 QualType ArgType = ClassType; 2180 QualType RetType = Context.getLValueReferenceType(ArgType); 2181 if (HasConstCopyAssignment) 2182 ArgType = ArgType.withConst(); 2183 ArgType = Context.getLValueReferenceType(ArgType); 2184 2185 // An implicitly-declared copy assignment operator is an inline public 2186 // member of its class. 2187 DeclarationName Name = 2188 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2189 CXXMethodDecl *CopyAssignment = 2190 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2191 Context.getFunctionType(RetType, &ArgType, 1, 2192 false, 0), 2193 /*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2194 CopyAssignment->setAccess(AS_public); 2195 CopyAssignment->setImplicit(); 2196 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2197 CopyAssignment->setCopyAssignment(true); 2198 2199 // Add the parameter to the operator. 2200 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2201 ClassDecl->getLocation(), 2202 /*IdentifierInfo=*/0, 2203 ArgType, /*TInfo=*/0, 2204 VarDecl::None, 0); 2205 CopyAssignment->setParams(Context, &FromParam, 1); 2206 2207 // Don't call addedAssignmentOperator. There is no way to distinguish an 2208 // implicit from an explicit assignment operator. 2209 ClassDecl->addDecl(CopyAssignment); 2210 AddOverriddenMethods(ClassDecl, CopyAssignment); 2211 } 2212 2213 if (!ClassDecl->hasUserDeclaredDestructor()) { 2214 // C++ [class.dtor]p2: 2215 // If a class has no user-declared destructor, a destructor is 2216 // declared implicitly. An implicitly-declared destructor is an 2217 // inline public member of its class. 2218 DeclarationName Name 2219 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2220 CXXDestructorDecl *Destructor 2221 = CXXDestructorDecl::Create(Context, ClassDecl, 2222 ClassDecl->getLocation(), Name, 2223 Context.getFunctionType(Context.VoidTy, 2224 0, 0, false, 0), 2225 /*isInline=*/true, 2226 /*isImplicitlyDeclared=*/true); 2227 Destructor->setAccess(AS_public); 2228 Destructor->setImplicit(); 2229 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2230 ClassDecl->addDecl(Destructor); 2231 2232 AddOverriddenMethods(ClassDecl, Destructor); 2233 } 2234} 2235 2236void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2237 Decl *D = TemplateD.getAs<Decl>(); 2238 if (!D) 2239 return; 2240 2241 TemplateParameterList *Params = 0; 2242 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2243 Params = Template->getTemplateParameters(); 2244 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2245 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2246 Params = PartialSpec->getTemplateParameters(); 2247 else 2248 return; 2249 2250 for (TemplateParameterList::iterator Param = Params->begin(), 2251 ParamEnd = Params->end(); 2252 Param != ParamEnd; ++Param) { 2253 NamedDecl *Named = cast<NamedDecl>(*Param); 2254 if (Named->getDeclName()) { 2255 S->AddDecl(DeclPtrTy::make(Named)); 2256 IdResolver.AddDecl(Named); 2257 } 2258 } 2259} 2260 2261/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2262/// parsing a top-level (non-nested) C++ class, and we are now 2263/// parsing those parts of the given Method declaration that could 2264/// not be parsed earlier (C++ [class.mem]p2), such as default 2265/// arguments. This action should enter the scope of the given 2266/// Method declaration as if we had just parsed the qualified method 2267/// name. However, it should not bring the parameters into scope; 2268/// that will be performed by ActOnDelayedCXXMethodParameter. 2269void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2270 if (!MethodD) 2271 return; 2272 2273 AdjustDeclIfTemplate(MethodD); 2274 2275 CXXScopeSpec SS; 2276 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2277 QualType ClassTy 2278 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 2279 SS.setScopeRep( 2280 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 2281 ActOnCXXEnterDeclaratorScope(S, SS); 2282} 2283 2284/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2285/// C++ method declaration. We're (re-)introducing the given 2286/// function parameter into scope for use in parsing later parts of 2287/// the method declaration. For example, we could see an 2288/// ActOnParamDefaultArgument event for this parameter. 2289void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2290 if (!ParamD) 2291 return; 2292 2293 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2294 2295 // If this parameter has an unparsed default argument, clear it out 2296 // to make way for the parsed default argument. 2297 if (Param->hasUnparsedDefaultArg()) 2298 Param->setDefaultArg(0); 2299 2300 S->AddDecl(DeclPtrTy::make(Param)); 2301 if (Param->getDeclName()) 2302 IdResolver.AddDecl(Param); 2303} 2304 2305/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2306/// processing the delayed method declaration for Method. The method 2307/// declaration is now considered finished. There may be a separate 2308/// ActOnStartOfFunctionDef action later (not necessarily 2309/// immediately!) for this method, if it was also defined inside the 2310/// class body. 2311void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2312 if (!MethodD) 2313 return; 2314 2315 AdjustDeclIfTemplate(MethodD); 2316 2317 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2318 CXXScopeSpec SS; 2319 QualType ClassTy 2320 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 2321 SS.setScopeRep( 2322 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 2323 ActOnCXXExitDeclaratorScope(S, SS); 2324 2325 // Now that we have our default arguments, check the constructor 2326 // again. It could produce additional diagnostics or affect whether 2327 // the class has implicitly-declared destructors, among other 2328 // things. 2329 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2330 CheckConstructor(Constructor); 2331 2332 // Check the default arguments, which we may have added. 2333 if (!Method->isInvalidDecl()) 2334 CheckCXXDefaultArguments(Method); 2335} 2336 2337/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2338/// the well-formedness of the constructor declarator @p D with type @p 2339/// R. If there are any errors in the declarator, this routine will 2340/// emit diagnostics and set the invalid bit to true. In any case, the type 2341/// will be updated to reflect a well-formed type for the constructor and 2342/// returned. 2343QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2344 FunctionDecl::StorageClass &SC) { 2345 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2346 2347 // C++ [class.ctor]p3: 2348 // A constructor shall not be virtual (10.3) or static (9.4). A 2349 // constructor can be invoked for a const, volatile or const 2350 // volatile object. A constructor shall not be declared const, 2351 // volatile, or const volatile (9.3.2). 2352 if (isVirtual) { 2353 if (!D.isInvalidType()) 2354 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2355 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2356 << SourceRange(D.getIdentifierLoc()); 2357 D.setInvalidType(); 2358 } 2359 if (SC == FunctionDecl::Static) { 2360 if (!D.isInvalidType()) 2361 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2362 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2363 << SourceRange(D.getIdentifierLoc()); 2364 D.setInvalidType(); 2365 SC = FunctionDecl::None; 2366 } 2367 2368 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2369 if (FTI.TypeQuals != 0) { 2370 if (FTI.TypeQuals & Qualifiers::Const) 2371 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2372 << "const" << SourceRange(D.getIdentifierLoc()); 2373 if (FTI.TypeQuals & Qualifiers::Volatile) 2374 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2375 << "volatile" << SourceRange(D.getIdentifierLoc()); 2376 if (FTI.TypeQuals & Qualifiers::Restrict) 2377 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2378 << "restrict" << SourceRange(D.getIdentifierLoc()); 2379 } 2380 2381 // Rebuild the function type "R" without any type qualifiers (in 2382 // case any of the errors above fired) and with "void" as the 2383 // return type, since constructors don't have return types. We 2384 // *always* have to do this, because GetTypeForDeclarator will 2385 // put in a result type of "int" when none was specified. 2386 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2387 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2388 Proto->getNumArgs(), 2389 Proto->isVariadic(), 0); 2390} 2391 2392/// CheckConstructor - Checks a fully-formed constructor for 2393/// well-formedness, issuing any diagnostics required. Returns true if 2394/// the constructor declarator is invalid. 2395void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2396 CXXRecordDecl *ClassDecl 2397 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2398 if (!ClassDecl) 2399 return Constructor->setInvalidDecl(); 2400 2401 // C++ [class.copy]p3: 2402 // A declaration of a constructor for a class X is ill-formed if 2403 // its first parameter is of type (optionally cv-qualified) X and 2404 // either there are no other parameters or else all other 2405 // parameters have default arguments. 2406 if (!Constructor->isInvalidDecl() && 2407 ((Constructor->getNumParams() == 1) || 2408 (Constructor->getNumParams() > 1 && 2409 Constructor->getParamDecl(1)->hasDefaultArg())) && 2410 Constructor->getTemplateSpecializationKind() 2411 != TSK_ImplicitInstantiation) { 2412 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2413 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2414 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2415 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2416 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2417 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 2418 2419 // FIXME: Rather that making the constructor invalid, we should endeavor 2420 // to fix the type. 2421 Constructor->setInvalidDecl(); 2422 } 2423 } 2424 2425 // Notify the class that we've added a constructor. 2426 ClassDecl->addedConstructor(Context, Constructor); 2427} 2428 2429/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2430/// issuing any diagnostics required. Returns true on error. 2431bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2432 CXXRecordDecl *RD = Destructor->getParent(); 2433 2434 if (Destructor->isVirtual()) { 2435 SourceLocation Loc; 2436 2437 if (!Destructor->isImplicit()) 2438 Loc = Destructor->getLocation(); 2439 else 2440 Loc = RD->getLocation(); 2441 2442 // If we have a virtual destructor, look up the deallocation function 2443 FunctionDecl *OperatorDelete = 0; 2444 DeclarationName Name = 2445 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2446 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2447 return true; 2448 2449 Destructor->setOperatorDelete(OperatorDelete); 2450 } 2451 2452 return false; 2453} 2454 2455static inline bool 2456FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2457 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2458 FTI.ArgInfo[0].Param && 2459 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2460} 2461 2462/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2463/// the well-formednes of the destructor declarator @p D with type @p 2464/// R. If there are any errors in the declarator, this routine will 2465/// emit diagnostics and set the declarator to invalid. Even if this happens, 2466/// will be updated to reflect a well-formed type for the destructor and 2467/// returned. 2468QualType Sema::CheckDestructorDeclarator(Declarator &D, 2469 FunctionDecl::StorageClass& SC) { 2470 // C++ [class.dtor]p1: 2471 // [...] A typedef-name that names a class is a class-name 2472 // (7.1.3); however, a typedef-name that names a class shall not 2473 // be used as the identifier in the declarator for a destructor 2474 // declaration. 2475 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2476 if (isa<TypedefType>(DeclaratorType)) { 2477 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2478 << DeclaratorType; 2479 D.setInvalidType(); 2480 } 2481 2482 // C++ [class.dtor]p2: 2483 // A destructor is used to destroy objects of its class type. A 2484 // destructor takes no parameters, and no return type can be 2485 // specified for it (not even void). The address of a destructor 2486 // shall not be taken. A destructor shall not be static. A 2487 // destructor can be invoked for a const, volatile or const 2488 // volatile object. A destructor shall not be declared const, 2489 // volatile or const volatile (9.3.2). 2490 if (SC == FunctionDecl::Static) { 2491 if (!D.isInvalidType()) 2492 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2493 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2494 << SourceRange(D.getIdentifierLoc()); 2495 SC = FunctionDecl::None; 2496 D.setInvalidType(); 2497 } 2498 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2499 // Destructors don't have return types, but the parser will 2500 // happily parse something like: 2501 // 2502 // class X { 2503 // float ~X(); 2504 // }; 2505 // 2506 // The return type will be eliminated later. 2507 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2508 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2509 << SourceRange(D.getIdentifierLoc()); 2510 } 2511 2512 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2513 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2514 if (FTI.TypeQuals & Qualifiers::Const) 2515 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2516 << "const" << SourceRange(D.getIdentifierLoc()); 2517 if (FTI.TypeQuals & Qualifiers::Volatile) 2518 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2519 << "volatile" << SourceRange(D.getIdentifierLoc()); 2520 if (FTI.TypeQuals & Qualifiers::Restrict) 2521 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2522 << "restrict" << SourceRange(D.getIdentifierLoc()); 2523 D.setInvalidType(); 2524 } 2525 2526 // Make sure we don't have any parameters. 2527 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2528 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2529 2530 // Delete the parameters. 2531 FTI.freeArgs(); 2532 D.setInvalidType(); 2533 } 2534 2535 // Make sure the destructor isn't variadic. 2536 if (FTI.isVariadic) { 2537 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2538 D.setInvalidType(); 2539 } 2540 2541 // Rebuild the function type "R" without any type qualifiers or 2542 // parameters (in case any of the errors above fired) and with 2543 // "void" as the return type, since destructors don't have return 2544 // types. We *always* have to do this, because GetTypeForDeclarator 2545 // will put in a result type of "int" when none was specified. 2546 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 2547} 2548 2549/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2550/// well-formednes of the conversion function declarator @p D with 2551/// type @p R. If there are any errors in the declarator, this routine 2552/// will emit diagnostics and return true. Otherwise, it will return 2553/// false. Either way, the type @p R will be updated to reflect a 2554/// well-formed type for the conversion operator. 2555void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2556 FunctionDecl::StorageClass& SC) { 2557 // C++ [class.conv.fct]p1: 2558 // Neither parameter types nor return type can be specified. The 2559 // type of a conversion function (8.3.5) is "function taking no 2560 // parameter returning conversion-type-id." 2561 if (SC == FunctionDecl::Static) { 2562 if (!D.isInvalidType()) 2563 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2564 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2565 << SourceRange(D.getIdentifierLoc()); 2566 D.setInvalidType(); 2567 SC = FunctionDecl::None; 2568 } 2569 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2570 // Conversion functions don't have return types, but the parser will 2571 // happily parse something like: 2572 // 2573 // class X { 2574 // float operator bool(); 2575 // }; 2576 // 2577 // The return type will be changed later anyway. 2578 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2579 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2580 << SourceRange(D.getIdentifierLoc()); 2581 } 2582 2583 // Make sure we don't have any parameters. 2584 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2585 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2586 2587 // Delete the parameters. 2588 D.getTypeObject(0).Fun.freeArgs(); 2589 D.setInvalidType(); 2590 } 2591 2592 // Make sure the conversion function isn't variadic. 2593 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2594 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2595 D.setInvalidType(); 2596 } 2597 2598 // C++ [class.conv.fct]p4: 2599 // The conversion-type-id shall not represent a function type nor 2600 // an array type. 2601 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2602 if (ConvType->isArrayType()) { 2603 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2604 ConvType = Context.getPointerType(ConvType); 2605 D.setInvalidType(); 2606 } else if (ConvType->isFunctionType()) { 2607 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2608 ConvType = Context.getPointerType(ConvType); 2609 D.setInvalidType(); 2610 } 2611 2612 // Rebuild the function type "R" without any parameters (in case any 2613 // of the errors above fired) and with the conversion type as the 2614 // return type. 2615 R = Context.getFunctionType(ConvType, 0, 0, false, 2616 R->getAs<FunctionProtoType>()->getTypeQuals()); 2617 2618 // C++0x explicit conversion operators. 2619 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2620 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2621 diag::warn_explicit_conversion_functions) 2622 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2623} 2624 2625/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2626/// the declaration of the given C++ conversion function. This routine 2627/// is responsible for recording the conversion function in the C++ 2628/// class, if possible. 2629Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2630 assert(Conversion && "Expected to receive a conversion function declaration"); 2631 2632 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2633 2634 // Make sure we aren't redeclaring the conversion function. 2635 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2636 2637 // C++ [class.conv.fct]p1: 2638 // [...] A conversion function is never used to convert a 2639 // (possibly cv-qualified) object to the (possibly cv-qualified) 2640 // same object type (or a reference to it), to a (possibly 2641 // cv-qualified) base class of that type (or a reference to it), 2642 // or to (possibly cv-qualified) void. 2643 // FIXME: Suppress this warning if the conversion function ends up being a 2644 // virtual function that overrides a virtual function in a base class. 2645 QualType ClassType 2646 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2647 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2648 ConvType = ConvTypeRef->getPointeeType(); 2649 if (ConvType->isRecordType()) { 2650 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2651 if (ConvType == ClassType) 2652 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2653 << ClassType; 2654 else if (IsDerivedFrom(ClassType, ConvType)) 2655 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2656 << ClassType << ConvType; 2657 } else if (ConvType->isVoidType()) { 2658 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2659 << ClassType << ConvType; 2660 } 2661 2662 if (Conversion->getPreviousDeclaration()) { 2663 const NamedDecl *ExpectedPrevDecl = Conversion->getPreviousDeclaration(); 2664 if (FunctionTemplateDecl *ConversionTemplate 2665 = Conversion->getDescribedFunctionTemplate()) 2666 ExpectedPrevDecl = ConversionTemplate->getPreviousDeclaration(); 2667 if (ClassDecl->replaceConversion(ExpectedPrevDecl, Conversion)) 2668 return DeclPtrTy::make(Conversion); 2669 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2670 } else if (FunctionTemplateDecl *ConversionTemplate 2671 = Conversion->getDescribedFunctionTemplate()) 2672 ClassDecl->addConversionFunction(ConversionTemplate); 2673 else if (!Conversion->getPrimaryTemplate()) // ignore specializations 2674 ClassDecl->addConversionFunction(Conversion); 2675 2676 return DeclPtrTy::make(Conversion); 2677} 2678 2679//===----------------------------------------------------------------------===// 2680// Namespace Handling 2681//===----------------------------------------------------------------------===// 2682 2683/// ActOnStartNamespaceDef - This is called at the start of a namespace 2684/// definition. 2685Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2686 SourceLocation IdentLoc, 2687 IdentifierInfo *II, 2688 SourceLocation LBrace) { 2689 NamespaceDecl *Namespc = 2690 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2691 Namespc->setLBracLoc(LBrace); 2692 2693 Scope *DeclRegionScope = NamespcScope->getParent(); 2694 2695 if (II) { 2696 // C++ [namespace.def]p2: 2697 // The identifier in an original-namespace-definition shall not have been 2698 // previously defined in the declarative region in which the 2699 // original-namespace-definition appears. The identifier in an 2700 // original-namespace-definition is the name of the namespace. Subsequently 2701 // in that declarative region, it is treated as an original-namespace-name. 2702 2703 NamedDecl *PrevDecl 2704 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2705 ForRedeclaration); 2706 2707 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2708 // This is an extended namespace definition. 2709 // Attach this namespace decl to the chain of extended namespace 2710 // definitions. 2711 OrigNS->setNextNamespace(Namespc); 2712 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2713 2714 // Remove the previous declaration from the scope. 2715 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2716 IdResolver.RemoveDecl(OrigNS); 2717 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2718 } 2719 } else if (PrevDecl) { 2720 // This is an invalid name redefinition. 2721 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2722 << Namespc->getDeclName(); 2723 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2724 Namespc->setInvalidDecl(); 2725 // Continue on to push Namespc as current DeclContext and return it. 2726 } else if (II->isStr("std") && 2727 CurContext->getLookupContext()->isTranslationUnit()) { 2728 // This is the first "real" definition of the namespace "std", so update 2729 // our cache of the "std" namespace to point at this definition. 2730 if (StdNamespace) { 2731 // We had already defined a dummy namespace "std". Link this new 2732 // namespace definition to the dummy namespace "std". 2733 StdNamespace->setNextNamespace(Namespc); 2734 StdNamespace->setLocation(IdentLoc); 2735 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2736 } 2737 2738 // Make our StdNamespace cache point at the first real definition of the 2739 // "std" namespace. 2740 StdNamespace = Namespc; 2741 } 2742 2743 PushOnScopeChains(Namespc, DeclRegionScope); 2744 } else { 2745 // Anonymous namespaces. 2746 2747 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2748 // behaves as if it were replaced by 2749 // namespace unique { /* empty body */ } 2750 // using namespace unique; 2751 // namespace unique { namespace-body } 2752 // where all occurrences of 'unique' in a translation unit are 2753 // replaced by the same identifier and this identifier differs 2754 // from all other identifiers in the entire program. 2755 2756 // We just create the namespace with an empty name and then add an 2757 // implicit using declaration, just like the standard suggests. 2758 // 2759 // CodeGen enforces the "universally unique" aspect by giving all 2760 // declarations semantically contained within an anonymous 2761 // namespace internal linkage. 2762 2763 assert(Namespc->isAnonymousNamespace()); 2764 CurContext->addDecl(Namespc); 2765 2766 UsingDirectiveDecl* UD 2767 = UsingDirectiveDecl::Create(Context, CurContext, 2768 /* 'using' */ LBrace, 2769 /* 'namespace' */ SourceLocation(), 2770 /* qualifier */ SourceRange(), 2771 /* NNS */ NULL, 2772 /* identifier */ SourceLocation(), 2773 Namespc, 2774 /* Ancestor */ CurContext); 2775 UD->setImplicit(); 2776 CurContext->addDecl(UD); 2777 } 2778 2779 // Although we could have an invalid decl (i.e. the namespace name is a 2780 // redefinition), push it as current DeclContext and try to continue parsing. 2781 // FIXME: We should be able to push Namespc here, so that the each DeclContext 2782 // for the namespace has the declarations that showed up in that particular 2783 // namespace definition. 2784 PushDeclContext(NamespcScope, Namespc); 2785 return DeclPtrTy::make(Namespc); 2786} 2787 2788/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2789/// is a namespace alias, returns the namespace it points to. 2790static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2791 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2792 return AD->getNamespace(); 2793 return dyn_cast_or_null<NamespaceDecl>(D); 2794} 2795 2796/// ActOnFinishNamespaceDef - This callback is called after a namespace is 2797/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 2798void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 2799 Decl *Dcl = D.getAs<Decl>(); 2800 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 2801 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 2802 Namespc->setRBracLoc(RBrace); 2803 PopDeclContext(); 2804} 2805 2806Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 2807 SourceLocation UsingLoc, 2808 SourceLocation NamespcLoc, 2809 const CXXScopeSpec &SS, 2810 SourceLocation IdentLoc, 2811 IdentifierInfo *NamespcName, 2812 AttributeList *AttrList) { 2813 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2814 assert(NamespcName && "Invalid NamespcName."); 2815 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 2816 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2817 2818 UsingDirectiveDecl *UDir = 0; 2819 2820 // Lookup namespace name. 2821 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 2822 LookupParsedName(R, S, &SS); 2823 if (R.isAmbiguous()) 2824 return DeclPtrTy(); 2825 2826 if (!R.empty()) { 2827 NamedDecl *Named = R.getFoundDecl(); 2828 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 2829 && "expected namespace decl"); 2830 // C++ [namespace.udir]p1: 2831 // A using-directive specifies that the names in the nominated 2832 // namespace can be used in the scope in which the 2833 // using-directive appears after the using-directive. During 2834 // unqualified name lookup (3.4.1), the names appear as if they 2835 // were declared in the nearest enclosing namespace which 2836 // contains both the using-directive and the nominated 2837 // namespace. [Note: in this context, "contains" means "contains 2838 // directly or indirectly". ] 2839 2840 // Find enclosing context containing both using-directive and 2841 // nominated namespace. 2842 NamespaceDecl *NS = getNamespaceDecl(Named); 2843 DeclContext *CommonAncestor = cast<DeclContext>(NS); 2844 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 2845 CommonAncestor = CommonAncestor->getParent(); 2846 2847 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 2848 SS.getRange(), 2849 (NestedNameSpecifier *)SS.getScopeRep(), 2850 IdentLoc, Named, CommonAncestor); 2851 PushUsingDirective(S, UDir); 2852 } else { 2853 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 2854 } 2855 2856 // FIXME: We ignore attributes for now. 2857 delete AttrList; 2858 return DeclPtrTy::make(UDir); 2859} 2860 2861void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2862 // If scope has associated entity, then using directive is at namespace 2863 // or translation unit scope. We add UsingDirectiveDecls, into 2864 // it's lookup structure. 2865 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2866 Ctx->addDecl(UDir); 2867 else 2868 // Otherwise it is block-sope. using-directives will affect lookup 2869 // only to the end of scope. 2870 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2871} 2872 2873 2874Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2875 AccessSpecifier AS, 2876 SourceLocation UsingLoc, 2877 const CXXScopeSpec &SS, 2878 UnqualifiedId &Name, 2879 AttributeList *AttrList, 2880 bool IsTypeName, 2881 SourceLocation TypenameLoc) { 2882 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2883 2884 switch (Name.getKind()) { 2885 case UnqualifiedId::IK_Identifier: 2886 case UnqualifiedId::IK_OperatorFunctionId: 2887 case UnqualifiedId::IK_LiteralOperatorId: 2888 case UnqualifiedId::IK_ConversionFunctionId: 2889 break; 2890 2891 case UnqualifiedId::IK_ConstructorName: 2892 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 2893 << SS.getRange(); 2894 return DeclPtrTy(); 2895 2896 case UnqualifiedId::IK_DestructorName: 2897 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 2898 << SS.getRange(); 2899 return DeclPtrTy(); 2900 2901 case UnqualifiedId::IK_TemplateId: 2902 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 2903 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 2904 return DeclPtrTy(); 2905 } 2906 2907 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 2908 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 2909 Name.getSourceRange().getBegin(), 2910 TargetName, AttrList, 2911 /* IsInstantiation */ false, 2912 IsTypeName, TypenameLoc); 2913 if (UD) 2914 PushOnScopeChains(UD, S, /*AddToContext*/ false); 2915 2916 return DeclPtrTy::make(UD); 2917} 2918 2919/// Builds a shadow declaration corresponding to a 'using' declaration. 2920static UsingShadowDecl *BuildUsingShadowDecl(Sema &SemaRef, Scope *S, 2921 AccessSpecifier AS, 2922 UsingDecl *UD, NamedDecl *Orig) { 2923 // FIXME: diagnose hiding, collisions 2924 2925 // If we resolved to another shadow declaration, just coalesce them. 2926 if (isa<UsingShadowDecl>(Orig)) { 2927 Orig = cast<UsingShadowDecl>(Orig)->getTargetDecl(); 2928 assert(!isa<UsingShadowDecl>(Orig) && "nested shadow declaration"); 2929 } 2930 2931 UsingShadowDecl *Shadow 2932 = UsingShadowDecl::Create(SemaRef.Context, SemaRef.CurContext, 2933 UD->getLocation(), UD, Orig); 2934 UD->addShadowDecl(Shadow); 2935 2936 if (S) 2937 SemaRef.PushOnScopeChains(Shadow, S); 2938 else 2939 SemaRef.CurContext->addDecl(Shadow); 2940 Shadow->setAccess(AS); 2941 2942 return Shadow; 2943} 2944 2945/// Builds a using declaration. 2946/// 2947/// \param IsInstantiation - Whether this call arises from an 2948/// instantiation of an unresolved using declaration. We treat 2949/// the lookup differently for these declarations. 2950NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 2951 SourceLocation UsingLoc, 2952 const CXXScopeSpec &SS, 2953 SourceLocation IdentLoc, 2954 DeclarationName Name, 2955 AttributeList *AttrList, 2956 bool IsInstantiation, 2957 bool IsTypeName, 2958 SourceLocation TypenameLoc) { 2959 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2960 assert(IdentLoc.isValid() && "Invalid TargetName location."); 2961 2962 // FIXME: We ignore attributes for now. 2963 delete AttrList; 2964 2965 if (SS.isEmpty()) { 2966 Diag(IdentLoc, diag::err_using_requires_qualname); 2967 return 0; 2968 } 2969 2970 NestedNameSpecifier *NNS = 2971 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 2972 2973 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 2974 return 0; 2975 2976 DeclContext *LookupContext = computeDeclContext(SS); 2977 NamedDecl *D; 2978 if (!LookupContext) { 2979 if (IsTypeName) { 2980 // FIXME: not all declaration name kinds are legal here 2981 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 2982 UsingLoc, TypenameLoc, 2983 SS.getRange(), NNS, 2984 IdentLoc, Name); 2985 } else { 2986 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 2987 UsingLoc, SS.getRange(), NNS, 2988 IdentLoc, Name); 2989 } 2990 } else { 2991 D = UsingDecl::Create(Context, CurContext, IdentLoc, 2992 SS.getRange(), UsingLoc, NNS, Name, 2993 IsTypeName); 2994 } 2995 D->setAccess(AS); 2996 CurContext->addDecl(D); 2997 2998 if (!LookupContext) return D; 2999 UsingDecl *UD = cast<UsingDecl>(D); 3000 3001 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(CurContext)) { 3002 // C++0x N2914 [namespace.udecl]p3: 3003 // A using-declaration used as a member-declaration shall refer to a member 3004 // of a base class of the class being defined, shall refer to a member of an 3005 // anonymous union that is a member of a base class of the class being 3006 // defined, or shall refer to an enumerator for an enumeration type that is 3007 // a member of a base class of the class being defined. 3008 3009 CXXRecordDecl *LookupRD = dyn_cast<CXXRecordDecl>(LookupContext); 3010 if (!LookupRD || !RD->isDerivedFrom(LookupRD)) { 3011 Diag(SS.getRange().getBegin(), 3012 diag::err_using_decl_nested_name_specifier_is_not_a_base_class) 3013 << NNS << RD->getDeclName(); 3014 UD->setInvalidDecl(); 3015 return UD; 3016 } 3017 } else { 3018 // C++0x N2914 [namespace.udecl]p8: 3019 // A using-declaration for a class member shall be a member-declaration. 3020 if (isa<CXXRecordDecl>(LookupContext)) { 3021 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_class_member) 3022 << SS.getRange(); 3023 UD->setInvalidDecl(); 3024 return UD; 3025 } 3026 } 3027 3028 // Look up the target name. Unlike most lookups, we do not want to 3029 // hide tag declarations: tag names are visible through the using 3030 // declaration even if hidden by ordinary names. 3031 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3032 3033 // We don't hide tags behind ordinary decls if we're in a 3034 // non-dependent context, but in a dependent context, this is 3035 // important for the stability of two-phase lookup. 3036 if (!IsInstantiation) 3037 R.setHideTags(false); 3038 3039 LookupQualifiedName(R, LookupContext); 3040 3041 if (R.empty()) { 3042 Diag(IdentLoc, diag::err_no_member) 3043 << Name << LookupContext << SS.getRange(); 3044 UD->setInvalidDecl(); 3045 return UD; 3046 } 3047 3048 if (R.isAmbiguous()) { 3049 UD->setInvalidDecl(); 3050 return UD; 3051 } 3052 3053 if (IsTypeName) { 3054 // If we asked for a typename and got a non-type decl, error out. 3055 if (!R.getAsSingle<TypeDecl>()) { 3056 Diag(IdentLoc, diag::err_using_typename_non_type); 3057 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3058 Diag((*I)->getUnderlyingDecl()->getLocation(), 3059 diag::note_using_decl_target); 3060 UD->setInvalidDecl(); 3061 return UD; 3062 } 3063 } else { 3064 // If we asked for a non-typename and we got a type, error out, 3065 // but only if this is an instantiation of an unresolved using 3066 // decl. Otherwise just silently find the type name. 3067 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3068 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3069 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3070 UD->setInvalidDecl(); 3071 return UD; 3072 } 3073 } 3074 3075 // C++0x N2914 [namespace.udecl]p6: 3076 // A using-declaration shall not name a namespace. 3077 if (R.getAsSingle<NamespaceDecl>()) { 3078 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3079 << SS.getRange(); 3080 UD->setInvalidDecl(); 3081 return UD; 3082 } 3083 3084 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3085 BuildUsingShadowDecl(*this, S, AS, UD, *I); 3086 3087 return UD; 3088} 3089 3090/// Checks that the given nested-name qualifier used in a using decl 3091/// in the current context is appropriately related to the current 3092/// scope. If an error is found, diagnoses it and returns true. 3093bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3094 const CXXScopeSpec &SS, 3095 SourceLocation NameLoc) { 3096 // FIXME: implement 3097 3098 return false; 3099} 3100 3101Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3102 SourceLocation NamespaceLoc, 3103 SourceLocation AliasLoc, 3104 IdentifierInfo *Alias, 3105 const CXXScopeSpec &SS, 3106 SourceLocation IdentLoc, 3107 IdentifierInfo *Ident) { 3108 3109 // Lookup the namespace name. 3110 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3111 LookupParsedName(R, S, &SS); 3112 3113 // Check if we have a previous declaration with the same name. 3114 if (NamedDecl *PrevDecl 3115 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3116 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3117 // We already have an alias with the same name that points to the same 3118 // namespace, so don't create a new one. 3119 if (!R.isAmbiguous() && !R.empty() && 3120 AD->getNamespace() == getNamespaceDecl(R.getFoundDecl())) 3121 return DeclPtrTy(); 3122 } 3123 3124 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3125 diag::err_redefinition_different_kind; 3126 Diag(AliasLoc, DiagID) << Alias; 3127 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3128 return DeclPtrTy(); 3129 } 3130 3131 if (R.isAmbiguous()) 3132 return DeclPtrTy(); 3133 3134 if (R.empty()) { 3135 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3136 return DeclPtrTy(); 3137 } 3138 3139 NamespaceAliasDecl *AliasDecl = 3140 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3141 Alias, SS.getRange(), 3142 (NestedNameSpecifier *)SS.getScopeRep(), 3143 IdentLoc, R.getFoundDecl()); 3144 3145 CurContext->addDecl(AliasDecl); 3146 return DeclPtrTy::make(AliasDecl); 3147} 3148 3149void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3150 CXXConstructorDecl *Constructor) { 3151 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3152 !Constructor->isUsed()) && 3153 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3154 3155 CXXRecordDecl *ClassDecl 3156 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3157 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3158 3159 if (SetBaseOrMemberInitializers(Constructor, 0, 0, true)) { 3160 Diag(CurrentLocation, diag::note_member_synthesized_at) 3161 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 3162 Constructor->setInvalidDecl(); 3163 } else { 3164 Constructor->setUsed(); 3165 } 3166} 3167 3168void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3169 CXXDestructorDecl *Destructor) { 3170 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3171 "DefineImplicitDestructor - call it for implicit default dtor"); 3172 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3173 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3174 // C++ [class.dtor] p5 3175 // Before the implicitly-declared default destructor for a class is 3176 // implicitly defined, all the implicitly-declared default destructors 3177 // for its base class and its non-static data members shall have been 3178 // implicitly defined. 3179 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3180 E = ClassDecl->bases_end(); Base != E; ++Base) { 3181 CXXRecordDecl *BaseClassDecl 3182 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3183 if (!BaseClassDecl->hasTrivialDestructor()) { 3184 if (CXXDestructorDecl *BaseDtor = 3185 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 3186 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 3187 else 3188 assert(false && 3189 "DefineImplicitDestructor - missing dtor in a base class"); 3190 } 3191 } 3192 3193 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3194 E = ClassDecl->field_end(); Field != E; ++Field) { 3195 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3196 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3197 FieldType = Array->getElementType(); 3198 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3199 CXXRecordDecl *FieldClassDecl 3200 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3201 if (!FieldClassDecl->hasTrivialDestructor()) { 3202 if (CXXDestructorDecl *FieldDtor = 3203 const_cast<CXXDestructorDecl*>( 3204 FieldClassDecl->getDestructor(Context))) 3205 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 3206 else 3207 assert(false && 3208 "DefineImplicitDestructor - missing dtor in class of a data member"); 3209 } 3210 } 3211 } 3212 3213 // FIXME: If CheckDestructor fails, we should emit a note about where the 3214 // implicit destructor was needed. 3215 if (CheckDestructor(Destructor)) { 3216 Diag(CurrentLocation, diag::note_member_synthesized_at) 3217 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3218 3219 Destructor->setInvalidDecl(); 3220 return; 3221 } 3222 3223 Destructor->setUsed(); 3224} 3225 3226void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3227 CXXMethodDecl *MethodDecl) { 3228 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3229 MethodDecl->getOverloadedOperator() == OO_Equal && 3230 !MethodDecl->isUsed()) && 3231 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3232 3233 CXXRecordDecl *ClassDecl 3234 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3235 3236 // C++[class.copy] p12 3237 // Before the implicitly-declared copy assignment operator for a class is 3238 // implicitly defined, all implicitly-declared copy assignment operators 3239 // for its direct base classes and its nonstatic data members shall have 3240 // been implicitly defined. 3241 bool err = false; 3242 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3243 E = ClassDecl->bases_end(); Base != E; ++Base) { 3244 CXXRecordDecl *BaseClassDecl 3245 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3246 if (CXXMethodDecl *BaseAssignOpMethod = 3247 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 3248 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3249 } 3250 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3251 E = ClassDecl->field_end(); Field != E; ++Field) { 3252 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3253 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3254 FieldType = Array->getElementType(); 3255 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3256 CXXRecordDecl *FieldClassDecl 3257 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3258 if (CXXMethodDecl *FieldAssignOpMethod = 3259 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 3260 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3261 } else if (FieldType->isReferenceType()) { 3262 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3263 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3264 Diag(Field->getLocation(), diag::note_declared_at); 3265 Diag(CurrentLocation, diag::note_first_required_here); 3266 err = true; 3267 } else if (FieldType.isConstQualified()) { 3268 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3269 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3270 Diag(Field->getLocation(), diag::note_declared_at); 3271 Diag(CurrentLocation, diag::note_first_required_here); 3272 err = true; 3273 } 3274 } 3275 if (!err) 3276 MethodDecl->setUsed(); 3277} 3278 3279CXXMethodDecl * 3280Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 3281 CXXRecordDecl *ClassDecl) { 3282 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3283 QualType RHSType(LHSType); 3284 // If class's assignment operator argument is const/volatile qualified, 3285 // look for operator = (const/volatile B&). Otherwise, look for 3286 // operator = (B&). 3287 RHSType = Context.getCVRQualifiedType(RHSType, 3288 ParmDecl->getType().getCVRQualifiers()); 3289 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3290 LHSType, 3291 SourceLocation())); 3292 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3293 RHSType, 3294 SourceLocation())); 3295 Expr *Args[2] = { &*LHS, &*RHS }; 3296 OverloadCandidateSet CandidateSet; 3297 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3298 CandidateSet); 3299 OverloadCandidateSet::iterator Best; 3300 if (BestViableFunction(CandidateSet, 3301 ClassDecl->getLocation(), Best) == OR_Success) 3302 return cast<CXXMethodDecl>(Best->Function); 3303 assert(false && 3304 "getAssignOperatorMethod - copy assignment operator method not found"); 3305 return 0; 3306} 3307 3308void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3309 CXXConstructorDecl *CopyConstructor, 3310 unsigned TypeQuals) { 3311 assert((CopyConstructor->isImplicit() && 3312 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 3313 !CopyConstructor->isUsed()) && 3314 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3315 3316 CXXRecordDecl *ClassDecl 3317 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3318 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3319 // C++ [class.copy] p209 3320 // Before the implicitly-declared copy constructor for a class is 3321 // implicitly defined, all the implicitly-declared copy constructors 3322 // for its base class and its non-static data members shall have been 3323 // implicitly defined. 3324 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3325 Base != ClassDecl->bases_end(); ++Base) { 3326 CXXRecordDecl *BaseClassDecl 3327 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3328 if (CXXConstructorDecl *BaseCopyCtor = 3329 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 3330 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3331 } 3332 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3333 FieldEnd = ClassDecl->field_end(); 3334 Field != FieldEnd; ++Field) { 3335 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3336 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3337 FieldType = Array->getElementType(); 3338 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3339 CXXRecordDecl *FieldClassDecl 3340 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3341 if (CXXConstructorDecl *FieldCopyCtor = 3342 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 3343 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3344 } 3345 } 3346 CopyConstructor->setUsed(); 3347} 3348 3349Sema::OwningExprResult 3350Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3351 CXXConstructorDecl *Constructor, 3352 MultiExprArg ExprArgs) { 3353 bool Elidable = false; 3354 3355 // C++ [class.copy]p15: 3356 // Whenever a temporary class object is copied using a copy constructor, and 3357 // this object and the copy have the same cv-unqualified type, an 3358 // implementation is permitted to treat the original and the copy as two 3359 // different ways of referring to the same object and not perform a copy at 3360 // all, even if the class copy constructor or destructor have side effects. 3361 3362 // FIXME: Is this enough? 3363 if (Constructor->isCopyConstructor(Context)) { 3364 Expr *E = ((Expr **)ExprArgs.get())[0]; 3365 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 3366 E = BE->getSubExpr(); 3367 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3368 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3369 E = ICE->getSubExpr(); 3370 3371 if (CallExpr *CE = dyn_cast<CallExpr>(E)) 3372 Elidable = !CE->getCallReturnType()->isReferenceType(); 3373 else if (isa<CXXTemporaryObjectExpr>(E)) 3374 Elidable = true; 3375 } 3376 3377 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 3378 Elidable, move(ExprArgs)); 3379} 3380 3381/// BuildCXXConstructExpr - Creates a complete call to a constructor, 3382/// including handling of its default argument expressions. 3383Sema::OwningExprResult 3384Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3385 CXXConstructorDecl *Constructor, bool Elidable, 3386 MultiExprArg ExprArgs) { 3387 unsigned NumExprs = ExprArgs.size(); 3388 Expr **Exprs = (Expr **)ExprArgs.release(); 3389 3390 MarkDeclarationReferenced(ConstructLoc, Constructor); 3391 return Owned(CXXConstructExpr::Create(Context, DeclInitType, Constructor, 3392 Elidable, Exprs, NumExprs)); 3393} 3394 3395Sema::OwningExprResult 3396Sema::BuildCXXTemporaryObjectExpr(CXXConstructorDecl *Constructor, 3397 QualType Ty, 3398 SourceLocation TyBeginLoc, 3399 MultiExprArg Args, 3400 SourceLocation RParenLoc) { 3401 unsigned NumExprs = Args.size(); 3402 Expr **Exprs = (Expr **)Args.release(); 3403 3404 MarkDeclarationReferenced(TyBeginLoc, Constructor); 3405 return Owned(new (Context) CXXTemporaryObjectExpr(Context, Constructor, Ty, 3406 TyBeginLoc, Exprs, 3407 NumExprs, RParenLoc)); 3408} 3409 3410 3411bool Sema::InitializeVarWithConstructor(VarDecl *VD, 3412 CXXConstructorDecl *Constructor, 3413 MultiExprArg Exprs) { 3414 OwningExprResult TempResult = 3415 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 3416 move(Exprs)); 3417 if (TempResult.isInvalid()) 3418 return true; 3419 3420 Expr *Temp = TempResult.takeAs<Expr>(); 3421 MarkDeclarationReferenced(VD->getLocation(), Constructor); 3422 Temp = MaybeCreateCXXExprWithTemporaries(Temp, /*DestroyTemps=*/true); 3423 VD->setInit(Context, Temp); 3424 3425 return false; 3426} 3427 3428void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) { 3429 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 3430 DeclInitType->getAs<RecordType>()->getDecl()); 3431 if (!ClassDecl->hasTrivialDestructor()) 3432 if (CXXDestructorDecl *Destructor = 3433 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 3434 MarkDeclarationReferenced(VD->getLocation(), Destructor); 3435} 3436 3437/// AddCXXDirectInitializerToDecl - This action is called immediately after 3438/// ActOnDeclarator, when a C++ direct initializer is present. 3439/// e.g: "int x(1);" 3440void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 3441 SourceLocation LParenLoc, 3442 MultiExprArg Exprs, 3443 SourceLocation *CommaLocs, 3444 SourceLocation RParenLoc) { 3445 unsigned NumExprs = Exprs.size(); 3446 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 3447 Decl *RealDecl = Dcl.getAs<Decl>(); 3448 3449 // If there is no declaration, there was an error parsing it. Just ignore 3450 // the initializer. 3451 if (RealDecl == 0) 3452 return; 3453 3454 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3455 if (!VDecl) { 3456 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3457 RealDecl->setInvalidDecl(); 3458 return; 3459 } 3460 3461 // We will represent direct-initialization similarly to copy-initialization: 3462 // int x(1); -as-> int x = 1; 3463 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 3464 // 3465 // Clients that want to distinguish between the two forms, can check for 3466 // direct initializer using VarDecl::hasCXXDirectInitializer(). 3467 // A major benefit is that clients that don't particularly care about which 3468 // exactly form was it (like the CodeGen) can handle both cases without 3469 // special case code. 3470 3471 // If either the declaration has a dependent type or if any of the expressions 3472 // is type-dependent, we represent the initialization via a ParenListExpr for 3473 // later use during template instantiation. 3474 if (VDecl->getType()->isDependentType() || 3475 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 3476 // Let clients know that initialization was done with a direct initializer. 3477 VDecl->setCXXDirectInitializer(true); 3478 3479 // Store the initialization expressions as a ParenListExpr. 3480 unsigned NumExprs = Exprs.size(); 3481 VDecl->setInit(Context, 3482 new (Context) ParenListExpr(Context, LParenLoc, 3483 (Expr **)Exprs.release(), 3484 NumExprs, RParenLoc)); 3485 return; 3486 } 3487 3488 3489 // C++ 8.5p11: 3490 // The form of initialization (using parentheses or '=') is generally 3491 // insignificant, but does matter when the entity being initialized has a 3492 // class type. 3493 QualType DeclInitType = VDecl->getType(); 3494 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 3495 DeclInitType = Context.getBaseElementType(Array); 3496 3497 // FIXME: This isn't the right place to complete the type. 3498 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 3499 diag::err_typecheck_decl_incomplete_type)) { 3500 VDecl->setInvalidDecl(); 3501 return; 3502 } 3503 3504 if (VDecl->getType()->isRecordType()) { 3505 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 3506 3507 CXXConstructorDecl *Constructor 3508 = PerformInitializationByConstructor(DeclInitType, 3509 move(Exprs), 3510 VDecl->getLocation(), 3511 SourceRange(VDecl->getLocation(), 3512 RParenLoc), 3513 VDecl->getDeclName(), 3514 IK_Direct, 3515 ConstructorArgs); 3516 if (!Constructor) 3517 RealDecl->setInvalidDecl(); 3518 else { 3519 VDecl->setCXXDirectInitializer(true); 3520 if (InitializeVarWithConstructor(VDecl, Constructor, 3521 move_arg(ConstructorArgs))) 3522 RealDecl->setInvalidDecl(); 3523 FinalizeVarWithDestructor(VDecl, DeclInitType); 3524 } 3525 return; 3526 } 3527 3528 if (NumExprs > 1) { 3529 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 3530 << SourceRange(VDecl->getLocation(), RParenLoc); 3531 RealDecl->setInvalidDecl(); 3532 return; 3533 } 3534 3535 // Let clients know that initialization was done with a direct initializer. 3536 VDecl->setCXXDirectInitializer(true); 3537 3538 assert(NumExprs == 1 && "Expected 1 expression"); 3539 // Set the init expression, handles conversions. 3540 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 3541 /*DirectInit=*/true); 3542} 3543 3544/// \brief Add the applicable constructor candidates for an initialization 3545/// by constructor. 3546static void AddConstructorInitializationCandidates(Sema &SemaRef, 3547 QualType ClassType, 3548 Expr **Args, 3549 unsigned NumArgs, 3550 Sema::InitializationKind Kind, 3551 OverloadCandidateSet &CandidateSet) { 3552 // C++ [dcl.init]p14: 3553 // If the initialization is direct-initialization, or if it is 3554 // copy-initialization where the cv-unqualified version of the 3555 // source type is the same class as, or a derived class of, the 3556 // class of the destination, constructors are considered. The 3557 // applicable constructors are enumerated (13.3.1.3), and the 3558 // best one is chosen through overload resolution (13.3). The 3559 // constructor so selected is called to initialize the object, 3560 // with the initializer expression(s) as its argument(s). If no 3561 // constructor applies, or the overload resolution is ambiguous, 3562 // the initialization is ill-formed. 3563 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 3564 assert(ClassRec && "Can only initialize a class type here"); 3565 3566 // FIXME: When we decide not to synthesize the implicitly-declared 3567 // constructors, we'll need to make them appear here. 3568 3569 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 3570 DeclarationName ConstructorName 3571 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 3572 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 3573 DeclContext::lookup_const_iterator Con, ConEnd; 3574 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 3575 Con != ConEnd; ++Con) { 3576 // Find the constructor (which may be a template). 3577 CXXConstructorDecl *Constructor = 0; 3578 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 3579 if (ConstructorTmpl) 3580 Constructor 3581 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 3582 else 3583 Constructor = cast<CXXConstructorDecl>(*Con); 3584 3585 if ((Kind == Sema::IK_Direct) || 3586 (Kind == Sema::IK_Copy && 3587 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 3588 (Kind == Sema::IK_Default && Constructor->isDefaultConstructor())) { 3589 if (ConstructorTmpl) 3590 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, 3591 /*ExplicitArgs*/ 0, 3592 Args, NumArgs, CandidateSet); 3593 else 3594 SemaRef.AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 3595 } 3596 } 3597} 3598 3599/// \brief Attempt to perform initialization by constructor 3600/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 3601/// copy-initialization. 3602/// 3603/// This routine determines whether initialization by constructor is possible, 3604/// but it does not emit any diagnostics in the case where the initialization 3605/// is ill-formed. 3606/// 3607/// \param ClassType the type of the object being initialized, which must have 3608/// class type. 3609/// 3610/// \param Args the arguments provided to initialize the object 3611/// 3612/// \param NumArgs the number of arguments provided to initialize the object 3613/// 3614/// \param Kind the type of initialization being performed 3615/// 3616/// \returns the constructor used to initialize the object, if successful. 3617/// Otherwise, emits a diagnostic and returns NULL. 3618CXXConstructorDecl * 3619Sema::TryInitializationByConstructor(QualType ClassType, 3620 Expr **Args, unsigned NumArgs, 3621 SourceLocation Loc, 3622 InitializationKind Kind) { 3623 // Build the overload candidate set 3624 OverloadCandidateSet CandidateSet; 3625 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 3626 CandidateSet); 3627 3628 // Determine whether we found a constructor we can use. 3629 OverloadCandidateSet::iterator Best; 3630 switch (BestViableFunction(CandidateSet, Loc, Best)) { 3631 case OR_Success: 3632 case OR_Deleted: 3633 // We found a constructor. Return it. 3634 return cast<CXXConstructorDecl>(Best->Function); 3635 3636 case OR_No_Viable_Function: 3637 case OR_Ambiguous: 3638 // Overload resolution failed. Return nothing. 3639 return 0; 3640 } 3641 3642 // Silence GCC warning 3643 return 0; 3644} 3645 3646/// \brief Perform initialization by constructor (C++ [dcl.init]p14), which 3647/// may occur as part of direct-initialization or copy-initialization. 3648/// 3649/// \param ClassType the type of the object being initialized, which must have 3650/// class type. 3651/// 3652/// \param ArgsPtr the arguments provided to initialize the object 3653/// 3654/// \param Loc the source location where the initialization occurs 3655/// 3656/// \param Range the source range that covers the entire initialization 3657/// 3658/// \param InitEntity the name of the entity being initialized, if known 3659/// 3660/// \param Kind the type of initialization being performed 3661/// 3662/// \param ConvertedArgs a vector that will be filled in with the 3663/// appropriately-converted arguments to the constructor (if initialization 3664/// succeeded). 3665/// 3666/// \returns the constructor used to initialize the object, if successful. 3667/// Otherwise, emits a diagnostic and returns NULL. 3668CXXConstructorDecl * 3669Sema::PerformInitializationByConstructor(QualType ClassType, 3670 MultiExprArg ArgsPtr, 3671 SourceLocation Loc, SourceRange Range, 3672 DeclarationName InitEntity, 3673 InitializationKind Kind, 3674 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 3675 3676 // Build the overload candidate set 3677 Expr **Args = (Expr **)ArgsPtr.get(); 3678 unsigned NumArgs = ArgsPtr.size(); 3679 OverloadCandidateSet CandidateSet; 3680 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 3681 CandidateSet); 3682 3683 OverloadCandidateSet::iterator Best; 3684 switch (BestViableFunction(CandidateSet, Loc, Best)) { 3685 case OR_Success: 3686 // We found a constructor. Break out so that we can convert the arguments 3687 // appropriately. 3688 break; 3689 3690 case OR_No_Viable_Function: 3691 if (InitEntity) 3692 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 3693 << InitEntity << Range; 3694 else 3695 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 3696 << ClassType << Range; 3697 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 3698 return 0; 3699 3700 case OR_Ambiguous: 3701 if (InitEntity) 3702 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 3703 else 3704 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 3705 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3706 return 0; 3707 3708 case OR_Deleted: 3709 if (InitEntity) 3710 Diag(Loc, diag::err_ovl_deleted_init) 3711 << Best->Function->isDeleted() 3712 << InitEntity << Range; 3713 else { 3714 const CXXRecordDecl *RD = 3715 cast<CXXRecordDecl>(ClassType->getAs<RecordType>()->getDecl()); 3716 Diag(Loc, diag::err_ovl_deleted_init) 3717 << Best->Function->isDeleted() 3718 << RD->getDeclName() << Range; 3719 } 3720 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3721 return 0; 3722 } 3723 3724 // Convert the arguments, fill in default arguments, etc. 3725 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function); 3726 if (CompleteConstructorCall(Constructor, move(ArgsPtr), Loc, ConvertedArgs)) 3727 return 0; 3728 3729 return Constructor; 3730} 3731 3732/// \brief Given a constructor and the set of arguments provided for the 3733/// constructor, convert the arguments and add any required default arguments 3734/// to form a proper call to this constructor. 3735/// 3736/// \returns true if an error occurred, false otherwise. 3737bool 3738Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 3739 MultiExprArg ArgsPtr, 3740 SourceLocation Loc, 3741 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 3742 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 3743 unsigned NumArgs = ArgsPtr.size(); 3744 Expr **Args = (Expr **)ArgsPtr.get(); 3745 3746 const FunctionProtoType *Proto 3747 = Constructor->getType()->getAs<FunctionProtoType>(); 3748 assert(Proto && "Constructor without a prototype?"); 3749 unsigned NumArgsInProto = Proto->getNumArgs(); 3750 3751 // If too few arguments are available, we'll fill in the rest with defaults. 3752 if (NumArgs < NumArgsInProto) 3753 ConvertedArgs.reserve(NumArgsInProto); 3754 else 3755 ConvertedArgs.reserve(NumArgs); 3756 3757 VariadicCallType CallType = 3758 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 3759 llvm::SmallVector<Expr *, 8> AllArgs; 3760 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 3761 Proto, 0, Args, NumArgs, AllArgs, 3762 CallType); 3763 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 3764 ConvertedArgs.push_back(AllArgs[i]); 3765 return Invalid; 3766} 3767 3768/// CompareReferenceRelationship - Compare the two types T1 and T2 to 3769/// determine whether they are reference-related, 3770/// reference-compatible, reference-compatible with added 3771/// qualification, or incompatible, for use in C++ initialization by 3772/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 3773/// type, and the first type (T1) is the pointee type of the reference 3774/// type being initialized. 3775Sema::ReferenceCompareResult 3776Sema::CompareReferenceRelationship(SourceLocation Loc, 3777 QualType OrigT1, QualType OrigT2, 3778 bool& DerivedToBase) { 3779 assert(!OrigT1->isReferenceType() && 3780 "T1 must be the pointee type of the reference type"); 3781 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 3782 3783 QualType T1 = Context.getCanonicalType(OrigT1); 3784 QualType T2 = Context.getCanonicalType(OrigT2); 3785 QualType UnqualT1 = T1.getLocalUnqualifiedType(); 3786 QualType UnqualT2 = T2.getLocalUnqualifiedType(); 3787 3788 // C++ [dcl.init.ref]p4: 3789 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 3790 // reference-related to "cv2 T2" if T1 is the same type as T2, or 3791 // T1 is a base class of T2. 3792 if (UnqualT1 == UnqualT2) 3793 DerivedToBase = false; 3794 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 3795 !RequireCompleteType(Loc, OrigT2, PDiag()) && 3796 IsDerivedFrom(UnqualT2, UnqualT1)) 3797 DerivedToBase = true; 3798 else 3799 return Ref_Incompatible; 3800 3801 // At this point, we know that T1 and T2 are reference-related (at 3802 // least). 3803 3804 // C++ [dcl.init.ref]p4: 3805 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 3806 // reference-related to T2 and cv1 is the same cv-qualification 3807 // as, or greater cv-qualification than, cv2. For purposes of 3808 // overload resolution, cases for which cv1 is greater 3809 // cv-qualification than cv2 are identified as 3810 // reference-compatible with added qualification (see 13.3.3.2). 3811 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 3812 return Ref_Compatible; 3813 else if (T1.isMoreQualifiedThan(T2)) 3814 return Ref_Compatible_With_Added_Qualification; 3815 else 3816 return Ref_Related; 3817} 3818 3819/// CheckReferenceInit - Check the initialization of a reference 3820/// variable with the given initializer (C++ [dcl.init.ref]). Init is 3821/// the initializer (either a simple initializer or an initializer 3822/// list), and DeclType is the type of the declaration. When ICS is 3823/// non-null, this routine will compute the implicit conversion 3824/// sequence according to C++ [over.ics.ref] and will not produce any 3825/// diagnostics; when ICS is null, it will emit diagnostics when any 3826/// errors are found. Either way, a return value of true indicates 3827/// that there was a failure, a return value of false indicates that 3828/// the reference initialization succeeded. 3829/// 3830/// When @p SuppressUserConversions, user-defined conversions are 3831/// suppressed. 3832/// When @p AllowExplicit, we also permit explicit user-defined 3833/// conversion functions. 3834/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 3835/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 3836/// This is used when this is called from a C-style cast. 3837bool 3838Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 3839 SourceLocation DeclLoc, 3840 bool SuppressUserConversions, 3841 bool AllowExplicit, bool ForceRValue, 3842 ImplicitConversionSequence *ICS, 3843 bool IgnoreBaseAccess) { 3844 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 3845 3846 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 3847 QualType T2 = Init->getType(); 3848 3849 // If the initializer is the address of an overloaded function, try 3850 // to resolve the overloaded function. If all goes well, T2 is the 3851 // type of the resulting function. 3852 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 3853 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 3854 ICS != 0); 3855 if (Fn) { 3856 // Since we're performing this reference-initialization for 3857 // real, update the initializer with the resulting function. 3858 if (!ICS) { 3859 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 3860 return true; 3861 3862 Init = FixOverloadedFunctionReference(Init, Fn); 3863 } 3864 3865 T2 = Fn->getType(); 3866 } 3867 } 3868 3869 // Compute some basic properties of the types and the initializer. 3870 bool isRValRef = DeclType->isRValueReferenceType(); 3871 bool DerivedToBase = false; 3872 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 3873 Init->isLvalue(Context); 3874 ReferenceCompareResult RefRelationship 3875 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 3876 3877 // Most paths end in a failed conversion. 3878 if (ICS) 3879 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 3880 3881 // C++ [dcl.init.ref]p5: 3882 // A reference to type "cv1 T1" is initialized by an expression 3883 // of type "cv2 T2" as follows: 3884 3885 // -- If the initializer expression 3886 3887 // Rvalue references cannot bind to lvalues (N2812). 3888 // There is absolutely no situation where they can. In particular, note that 3889 // this is ill-formed, even if B has a user-defined conversion to A&&: 3890 // B b; 3891 // A&& r = b; 3892 if (isRValRef && InitLvalue == Expr::LV_Valid) { 3893 if (!ICS) 3894 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 3895 << Init->getSourceRange(); 3896 return true; 3897 } 3898 3899 bool BindsDirectly = false; 3900 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 3901 // reference-compatible with "cv2 T2," or 3902 // 3903 // Note that the bit-field check is skipped if we are just computing 3904 // the implicit conversion sequence (C++ [over.best.ics]p2). 3905 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 3906 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 3907 BindsDirectly = true; 3908 3909 if (ICS) { 3910 // C++ [over.ics.ref]p1: 3911 // When a parameter of reference type binds directly (8.5.3) 3912 // to an argument expression, the implicit conversion sequence 3913 // is the identity conversion, unless the argument expression 3914 // has a type that is a derived class of the parameter type, 3915 // in which case the implicit conversion sequence is a 3916 // derived-to-base Conversion (13.3.3.1). 3917 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 3918 ICS->Standard.First = ICK_Identity; 3919 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 3920 ICS->Standard.Third = ICK_Identity; 3921 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 3922 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 3923 ICS->Standard.ReferenceBinding = true; 3924 ICS->Standard.DirectBinding = true; 3925 ICS->Standard.RRefBinding = false; 3926 ICS->Standard.CopyConstructor = 0; 3927 3928 // Nothing more to do: the inaccessibility/ambiguity check for 3929 // derived-to-base conversions is suppressed when we're 3930 // computing the implicit conversion sequence (C++ 3931 // [over.best.ics]p2). 3932 return false; 3933 } else { 3934 // Perform the conversion. 3935 CastExpr::CastKind CK = CastExpr::CK_NoOp; 3936 if (DerivedToBase) 3937 CK = CastExpr::CK_DerivedToBase; 3938 else if(CheckExceptionSpecCompatibility(Init, T1)) 3939 return true; 3940 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 3941 } 3942 } 3943 3944 // -- has a class type (i.e., T2 is a class type) and can be 3945 // implicitly converted to an lvalue of type "cv3 T3," 3946 // where "cv1 T1" is reference-compatible with "cv3 T3" 3947 // 92) (this conversion is selected by enumerating the 3948 // applicable conversion functions (13.3.1.6) and choosing 3949 // the best one through overload resolution (13.3)), 3950 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 3951 !RequireCompleteType(DeclLoc, T2, 0)) { 3952 CXXRecordDecl *T2RecordDecl 3953 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 3954 3955 OverloadCandidateSet CandidateSet; 3956 const UnresolvedSet *Conversions 3957 = T2RecordDecl->getVisibleConversionFunctions(); 3958 for (UnresolvedSet::iterator I = Conversions->begin(), 3959 E = Conversions->end(); I != E; ++I) { 3960 NamedDecl *D = *I; 3961 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); 3962 if (isa<UsingShadowDecl>(D)) 3963 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 3964 3965 FunctionTemplateDecl *ConvTemplate 3966 = dyn_cast<FunctionTemplateDecl>(D); 3967 CXXConversionDecl *Conv; 3968 if (ConvTemplate) 3969 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 3970 else 3971 Conv = cast<CXXConversionDecl>(D); 3972 3973 // If the conversion function doesn't return a reference type, 3974 // it can't be considered for this conversion. 3975 if (Conv->getConversionType()->isLValueReferenceType() && 3976 (AllowExplicit || !Conv->isExplicit())) { 3977 if (ConvTemplate) 3978 AddTemplateConversionCandidate(ConvTemplate, ActingDC, 3979 Init, DeclType, CandidateSet); 3980 else 3981 AddConversionCandidate(Conv, ActingDC, Init, DeclType, CandidateSet); 3982 } 3983 } 3984 3985 OverloadCandidateSet::iterator Best; 3986 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 3987 case OR_Success: 3988 // This is a direct binding. 3989 BindsDirectly = true; 3990 3991 if (ICS) { 3992 // C++ [over.ics.ref]p1: 3993 // 3994 // [...] If the parameter binds directly to the result of 3995 // applying a conversion function to the argument 3996 // expression, the implicit conversion sequence is a 3997 // user-defined conversion sequence (13.3.3.1.2), with the 3998 // second standard conversion sequence either an identity 3999 // conversion or, if the conversion function returns an 4000 // entity of a type that is a derived class of the parameter 4001 // type, a derived-to-base Conversion. 4002 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 4003 ICS->UserDefined.Before = Best->Conversions[0].Standard; 4004 ICS->UserDefined.After = Best->FinalConversion; 4005 ICS->UserDefined.ConversionFunction = Best->Function; 4006 ICS->UserDefined.EllipsisConversion = false; 4007 assert(ICS->UserDefined.After.ReferenceBinding && 4008 ICS->UserDefined.After.DirectBinding && 4009 "Expected a direct reference binding!"); 4010 return false; 4011 } else { 4012 OwningExprResult InitConversion = 4013 BuildCXXCastArgument(DeclLoc, QualType(), 4014 CastExpr::CK_UserDefinedConversion, 4015 cast<CXXMethodDecl>(Best->Function), 4016 Owned(Init)); 4017 Init = InitConversion.takeAs<Expr>(); 4018 4019 if (CheckExceptionSpecCompatibility(Init, T1)) 4020 return true; 4021 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 4022 /*isLvalue=*/true); 4023 } 4024 break; 4025 4026 case OR_Ambiguous: 4027 if (ICS) { 4028 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 4029 Cand != CandidateSet.end(); ++Cand) 4030 if (Cand->Viable) 4031 ICS->ConversionFunctionSet.push_back(Cand->Function); 4032 break; 4033 } 4034 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 4035 << Init->getSourceRange(); 4036 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 4037 return true; 4038 4039 case OR_No_Viable_Function: 4040 case OR_Deleted: 4041 // There was no suitable conversion, or we found a deleted 4042 // conversion; continue with other checks. 4043 break; 4044 } 4045 } 4046 4047 if (BindsDirectly) { 4048 // C++ [dcl.init.ref]p4: 4049 // [...] In all cases where the reference-related or 4050 // reference-compatible relationship of two types is used to 4051 // establish the validity of a reference binding, and T1 is a 4052 // base class of T2, a program that necessitates such a binding 4053 // is ill-formed if T1 is an inaccessible (clause 11) or 4054 // ambiguous (10.2) base class of T2. 4055 // 4056 // Note that we only check this condition when we're allowed to 4057 // complain about errors, because we should not be checking for 4058 // ambiguity (or inaccessibility) unless the reference binding 4059 // actually happens. 4060 if (DerivedToBase) 4061 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 4062 Init->getSourceRange(), 4063 IgnoreBaseAccess); 4064 else 4065 return false; 4066 } 4067 4068 // -- Otherwise, the reference shall be to a non-volatile const 4069 // type (i.e., cv1 shall be const), or the reference shall be an 4070 // rvalue reference and the initializer expression shall be an rvalue. 4071 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4072 if (!ICS) 4073 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4074 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 4075 << T2 << Init->getSourceRange(); 4076 return true; 4077 } 4078 4079 // -- If the initializer expression is an rvalue, with T2 a 4080 // class type, and "cv1 T1" is reference-compatible with 4081 // "cv2 T2," the reference is bound in one of the 4082 // following ways (the choice is implementation-defined): 4083 // 4084 // -- The reference is bound to the object represented by 4085 // the rvalue (see 3.10) or to a sub-object within that 4086 // object. 4087 // 4088 // -- A temporary of type "cv1 T2" [sic] is created, and 4089 // a constructor is called to copy the entire rvalue 4090 // object into the temporary. The reference is bound to 4091 // the temporary or to a sub-object within the 4092 // temporary. 4093 // 4094 // The constructor that would be used to make the copy 4095 // shall be callable whether or not the copy is actually 4096 // done. 4097 // 4098 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4099 // freedom, so we will always take the first option and never build 4100 // a temporary in this case. FIXME: We will, however, have to check 4101 // for the presence of a copy constructor in C++98/03 mode. 4102 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4103 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4104 if (ICS) { 4105 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 4106 ICS->Standard.First = ICK_Identity; 4107 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4108 ICS->Standard.Third = ICK_Identity; 4109 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4110 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 4111 ICS->Standard.ReferenceBinding = true; 4112 ICS->Standard.DirectBinding = false; 4113 ICS->Standard.RRefBinding = isRValRef; 4114 ICS->Standard.CopyConstructor = 0; 4115 } else { 4116 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4117 if (DerivedToBase) 4118 CK = CastExpr::CK_DerivedToBase; 4119 else if(CheckExceptionSpecCompatibility(Init, T1)) 4120 return true; 4121 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4122 } 4123 return false; 4124 } 4125 4126 // -- Otherwise, a temporary of type "cv1 T1" is created and 4127 // initialized from the initializer expression using the 4128 // rules for a non-reference copy initialization (8.5). The 4129 // reference is then bound to the temporary. If T1 is 4130 // reference-related to T2, cv1 must be the same 4131 // cv-qualification as, or greater cv-qualification than, 4132 // cv2; otherwise, the program is ill-formed. 4133 if (RefRelationship == Ref_Related) { 4134 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4135 // we would be reference-compatible or reference-compatible with 4136 // added qualification. But that wasn't the case, so the reference 4137 // initialization fails. 4138 if (!ICS) 4139 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4140 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 4141 << T2 << Init->getSourceRange(); 4142 return true; 4143 } 4144 4145 // If at least one of the types is a class type, the types are not 4146 // related, and we aren't allowed any user conversions, the 4147 // reference binding fails. This case is important for breaking 4148 // recursion, since TryImplicitConversion below will attempt to 4149 // create a temporary through the use of a copy constructor. 4150 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4151 (T1->isRecordType() || T2->isRecordType())) { 4152 if (!ICS) 4153 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4154 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 4155 return true; 4156 } 4157 4158 // Actually try to convert the initializer to T1. 4159 if (ICS) { 4160 // C++ [over.ics.ref]p2: 4161 // 4162 // When a parameter of reference type is not bound directly to 4163 // an argument expression, the conversion sequence is the one 4164 // required to convert the argument expression to the 4165 // underlying type of the reference according to 4166 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4167 // to copy-initializing a temporary of the underlying type with 4168 // the argument expression. Any difference in top-level 4169 // cv-qualification is subsumed by the initialization itself 4170 // and does not constitute a conversion. 4171 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4172 /*AllowExplicit=*/false, 4173 /*ForceRValue=*/false, 4174 /*InOverloadResolution=*/false); 4175 4176 // Of course, that's still a reference binding. 4177 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 4178 ICS->Standard.ReferenceBinding = true; 4179 ICS->Standard.RRefBinding = isRValRef; 4180 } else if (ICS->ConversionKind == 4181 ImplicitConversionSequence::UserDefinedConversion) { 4182 ICS->UserDefined.After.ReferenceBinding = true; 4183 ICS->UserDefined.After.RRefBinding = isRValRef; 4184 } 4185 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 4186 } else { 4187 ImplicitConversionSequence Conversions; 4188 bool badConversion = PerformImplicitConversion(Init, T1, "initializing", 4189 false, false, 4190 Conversions); 4191 if (badConversion) { 4192 if ((Conversions.ConversionKind == 4193 ImplicitConversionSequence::BadConversion) 4194 && !Conversions.ConversionFunctionSet.empty()) { 4195 Diag(DeclLoc, 4196 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4197 for (int j = Conversions.ConversionFunctionSet.size()-1; 4198 j >= 0; j--) { 4199 FunctionDecl *Func = Conversions.ConversionFunctionSet[j]; 4200 Diag(Func->getLocation(), diag::err_ovl_candidate); 4201 } 4202 } 4203 else { 4204 if (isRValRef) 4205 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4206 << Init->getSourceRange(); 4207 else 4208 Diag(DeclLoc, diag::err_invalid_initialization) 4209 << DeclType << Init->getType() << Init->getSourceRange(); 4210 } 4211 } 4212 return badConversion; 4213 } 4214} 4215 4216/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4217/// of this overloaded operator is well-formed. If so, returns false; 4218/// otherwise, emits appropriate diagnostics and returns true. 4219bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4220 assert(FnDecl && FnDecl->isOverloadedOperator() && 4221 "Expected an overloaded operator declaration"); 4222 4223 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4224 4225 // C++ [over.oper]p5: 4226 // The allocation and deallocation functions, operator new, 4227 // operator new[], operator delete and operator delete[], are 4228 // described completely in 3.7.3. The attributes and restrictions 4229 // found in the rest of this subclause do not apply to them unless 4230 // explicitly stated in 3.7.3. 4231 // FIXME: Write a separate routine for checking this. For now, just allow it. 4232 if (Op == OO_Delete || Op == OO_Array_Delete) 4233 return false; 4234 4235 if (Op == OO_New || Op == OO_Array_New) { 4236 bool ret = false; 4237 if (FunctionDecl::param_iterator Param = FnDecl->param_begin()) { 4238 QualType SizeTy = Context.getCanonicalType(Context.getSizeType()); 4239 QualType T = Context.getCanonicalType((*Param)->getType()); 4240 if (!T->isDependentType() && SizeTy != T) { 4241 Diag(FnDecl->getLocation(), 4242 diag::err_operator_new_param_type) << FnDecl->getDeclName() 4243 << SizeTy; 4244 ret = true; 4245 } 4246 } 4247 QualType ResultTy = Context.getCanonicalType(FnDecl->getResultType()); 4248 if (!ResultTy->isDependentType() && ResultTy != Context.VoidPtrTy) 4249 return Diag(FnDecl->getLocation(), 4250 diag::err_operator_new_result_type) << FnDecl->getDeclName() 4251 << static_cast<QualType>(Context.VoidPtrTy); 4252 return ret; 4253 } 4254 4255 // C++ [over.oper]p6: 4256 // An operator function shall either be a non-static member 4257 // function or be a non-member function and have at least one 4258 // parameter whose type is a class, a reference to a class, an 4259 // enumeration, or a reference to an enumeration. 4260 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4261 if (MethodDecl->isStatic()) 4262 return Diag(FnDecl->getLocation(), 4263 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4264 } else { 4265 bool ClassOrEnumParam = false; 4266 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4267 ParamEnd = FnDecl->param_end(); 4268 Param != ParamEnd; ++Param) { 4269 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4270 if (ParamType->isDependentType() || ParamType->isRecordType() || 4271 ParamType->isEnumeralType()) { 4272 ClassOrEnumParam = true; 4273 break; 4274 } 4275 } 4276 4277 if (!ClassOrEnumParam) 4278 return Diag(FnDecl->getLocation(), 4279 diag::err_operator_overload_needs_class_or_enum) 4280 << FnDecl->getDeclName(); 4281 } 4282 4283 // C++ [over.oper]p8: 4284 // An operator function cannot have default arguments (8.3.6), 4285 // except where explicitly stated below. 4286 // 4287 // Only the function-call operator allows default arguments 4288 // (C++ [over.call]p1). 4289 if (Op != OO_Call) { 4290 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4291 Param != FnDecl->param_end(); ++Param) { 4292 if ((*Param)->hasUnparsedDefaultArg()) 4293 return Diag((*Param)->getLocation(), 4294 diag::err_operator_overload_default_arg) 4295 << FnDecl->getDeclName(); 4296 else if (Expr *DefArg = (*Param)->getDefaultArg()) 4297 return Diag((*Param)->getLocation(), 4298 diag::err_operator_overload_default_arg) 4299 << FnDecl->getDeclName() << DefArg->getSourceRange(); 4300 } 4301 } 4302 4303 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4304 { false, false, false } 4305#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4306 , { Unary, Binary, MemberOnly } 4307#include "clang/Basic/OperatorKinds.def" 4308 }; 4309 4310 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4311 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4312 bool MustBeMemberOperator = OperatorUses[Op][2]; 4313 4314 // C++ [over.oper]p8: 4315 // [...] Operator functions cannot have more or fewer parameters 4316 // than the number required for the corresponding operator, as 4317 // described in the rest of this subclause. 4318 unsigned NumParams = FnDecl->getNumParams() 4319 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4320 if (Op != OO_Call && 4321 ((NumParams == 1 && !CanBeUnaryOperator) || 4322 (NumParams == 2 && !CanBeBinaryOperator) || 4323 (NumParams < 1) || (NumParams > 2))) { 4324 // We have the wrong number of parameters. 4325 unsigned ErrorKind; 4326 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4327 ErrorKind = 2; // 2 -> unary or binary. 4328 } else if (CanBeUnaryOperator) { 4329 ErrorKind = 0; // 0 -> unary 4330 } else { 4331 assert(CanBeBinaryOperator && 4332 "All non-call overloaded operators are unary or binary!"); 4333 ErrorKind = 1; // 1 -> binary 4334 } 4335 4336 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4337 << FnDecl->getDeclName() << NumParams << ErrorKind; 4338 } 4339 4340 // Overloaded operators other than operator() cannot be variadic. 4341 if (Op != OO_Call && 4342 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4343 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4344 << FnDecl->getDeclName(); 4345 } 4346 4347 // Some operators must be non-static member functions. 4348 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4349 return Diag(FnDecl->getLocation(), 4350 diag::err_operator_overload_must_be_member) 4351 << FnDecl->getDeclName(); 4352 } 4353 4354 // C++ [over.inc]p1: 4355 // The user-defined function called operator++ implements the 4356 // prefix and postfix ++ operator. If this function is a member 4357 // function with no parameters, or a non-member function with one 4358 // parameter of class or enumeration type, it defines the prefix 4359 // increment operator ++ for objects of that type. If the function 4360 // is a member function with one parameter (which shall be of type 4361 // int) or a non-member function with two parameters (the second 4362 // of which shall be of type int), it defines the postfix 4363 // increment operator ++ for objects of that type. 4364 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4365 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4366 bool ParamIsInt = false; 4367 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4368 ParamIsInt = BT->getKind() == BuiltinType::Int; 4369 4370 if (!ParamIsInt) 4371 return Diag(LastParam->getLocation(), 4372 diag::err_operator_overload_post_incdec_must_be_int) 4373 << LastParam->getType() << (Op == OO_MinusMinus); 4374 } 4375 4376 // Notify the class if it got an assignment operator. 4377 if (Op == OO_Equal) { 4378 // Would have returned earlier otherwise. 4379 assert(isa<CXXMethodDecl>(FnDecl) && 4380 "Overloaded = not member, but not filtered."); 4381 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 4382 Method->getParent()->addedAssignmentOperator(Context, Method); 4383 } 4384 4385 return false; 4386} 4387 4388/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 4389/// linkage specification, including the language and (if present) 4390/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 4391/// the location of the language string literal, which is provided 4392/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 4393/// the '{' brace. Otherwise, this linkage specification does not 4394/// have any braces. 4395Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 4396 SourceLocation ExternLoc, 4397 SourceLocation LangLoc, 4398 const char *Lang, 4399 unsigned StrSize, 4400 SourceLocation LBraceLoc) { 4401 LinkageSpecDecl::LanguageIDs Language; 4402 if (strncmp(Lang, "\"C\"", StrSize) == 0) 4403 Language = LinkageSpecDecl::lang_c; 4404 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 4405 Language = LinkageSpecDecl::lang_cxx; 4406 else { 4407 Diag(LangLoc, diag::err_bad_language); 4408 return DeclPtrTy(); 4409 } 4410 4411 // FIXME: Add all the various semantics of linkage specifications 4412 4413 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 4414 LangLoc, Language, 4415 LBraceLoc.isValid()); 4416 CurContext->addDecl(D); 4417 PushDeclContext(S, D); 4418 return DeclPtrTy::make(D); 4419} 4420 4421/// ActOnFinishLinkageSpecification - Completely the definition of 4422/// the C++ linkage specification LinkageSpec. If RBraceLoc is 4423/// valid, it's the position of the closing '}' brace in a linkage 4424/// specification that uses braces. 4425Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 4426 DeclPtrTy LinkageSpec, 4427 SourceLocation RBraceLoc) { 4428 if (LinkageSpec) 4429 PopDeclContext(); 4430 return LinkageSpec; 4431} 4432 4433/// \brief Perform semantic analysis for the variable declaration that 4434/// occurs within a C++ catch clause, returning the newly-created 4435/// variable. 4436VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 4437 TypeSourceInfo *TInfo, 4438 IdentifierInfo *Name, 4439 SourceLocation Loc, 4440 SourceRange Range) { 4441 bool Invalid = false; 4442 4443 // Arrays and functions decay. 4444 if (ExDeclType->isArrayType()) 4445 ExDeclType = Context.getArrayDecayedType(ExDeclType); 4446 else if (ExDeclType->isFunctionType()) 4447 ExDeclType = Context.getPointerType(ExDeclType); 4448 4449 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 4450 // The exception-declaration shall not denote a pointer or reference to an 4451 // incomplete type, other than [cv] void*. 4452 // N2844 forbids rvalue references. 4453 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 4454 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 4455 Invalid = true; 4456 } 4457 4458 QualType BaseType = ExDeclType; 4459 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 4460 unsigned DK = diag::err_catch_incomplete; 4461 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 4462 BaseType = Ptr->getPointeeType(); 4463 Mode = 1; 4464 DK = diag::err_catch_incomplete_ptr; 4465 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 4466 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 4467 BaseType = Ref->getPointeeType(); 4468 Mode = 2; 4469 DK = diag::err_catch_incomplete_ref; 4470 } 4471 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 4472 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 4473 Invalid = true; 4474 4475 if (!Invalid && !ExDeclType->isDependentType() && 4476 RequireNonAbstractType(Loc, ExDeclType, 4477 diag::err_abstract_type_in_decl, 4478 AbstractVariableType)) 4479 Invalid = true; 4480 4481 // FIXME: Need to test for ability to copy-construct and destroy the 4482 // exception variable. 4483 4484 // FIXME: Need to check for abstract classes. 4485 4486 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 4487 Name, ExDeclType, TInfo, VarDecl::None); 4488 4489 if (Invalid) 4490 ExDecl->setInvalidDecl(); 4491 4492 return ExDecl; 4493} 4494 4495/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 4496/// handler. 4497Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 4498 TypeSourceInfo *TInfo = 0; 4499 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 4500 4501 bool Invalid = D.isInvalidType(); 4502 IdentifierInfo *II = D.getIdentifier(); 4503 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 4504 // The scope should be freshly made just for us. There is just no way 4505 // it contains any previous declaration. 4506 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 4507 if (PrevDecl->isTemplateParameter()) { 4508 // Maybe we will complain about the shadowed template parameter. 4509 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4510 } 4511 } 4512 4513 if (D.getCXXScopeSpec().isSet() && !Invalid) { 4514 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 4515 << D.getCXXScopeSpec().getRange(); 4516 Invalid = true; 4517 } 4518 4519 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 4520 D.getIdentifier(), 4521 D.getIdentifierLoc(), 4522 D.getDeclSpec().getSourceRange()); 4523 4524 if (Invalid) 4525 ExDecl->setInvalidDecl(); 4526 4527 // Add the exception declaration into this scope. 4528 if (II) 4529 PushOnScopeChains(ExDecl, S); 4530 else 4531 CurContext->addDecl(ExDecl); 4532 4533 ProcessDeclAttributes(S, ExDecl, D); 4534 return DeclPtrTy::make(ExDecl); 4535} 4536 4537Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 4538 ExprArg assertexpr, 4539 ExprArg assertmessageexpr) { 4540 Expr *AssertExpr = (Expr *)assertexpr.get(); 4541 StringLiteral *AssertMessage = 4542 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 4543 4544 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 4545 llvm::APSInt Value(32); 4546 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 4547 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 4548 AssertExpr->getSourceRange(); 4549 return DeclPtrTy(); 4550 } 4551 4552 if (Value == 0) { 4553 std::string str(AssertMessage->getStrData(), 4554 AssertMessage->getByteLength()); 4555 Diag(AssertLoc, diag::err_static_assert_failed) 4556 << str << AssertExpr->getSourceRange(); 4557 } 4558 } 4559 4560 assertexpr.release(); 4561 assertmessageexpr.release(); 4562 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 4563 AssertExpr, AssertMessage); 4564 4565 CurContext->addDecl(Decl); 4566 return DeclPtrTy::make(Decl); 4567} 4568 4569/// Handle a friend type declaration. This works in tandem with 4570/// ActOnTag. 4571/// 4572/// Notes on friend class templates: 4573/// 4574/// We generally treat friend class declarations as if they were 4575/// declaring a class. So, for example, the elaborated type specifier 4576/// in a friend declaration is required to obey the restrictions of a 4577/// class-head (i.e. no typedefs in the scope chain), template 4578/// parameters are required to match up with simple template-ids, &c. 4579/// However, unlike when declaring a template specialization, it's 4580/// okay to refer to a template specialization without an empty 4581/// template parameter declaration, e.g. 4582/// friend class A<T>::B<unsigned>; 4583/// We permit this as a special case; if there are any template 4584/// parameters present at all, require proper matching, i.e. 4585/// template <> template <class T> friend class A<int>::B; 4586Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 4587 MultiTemplateParamsArg TempParams) { 4588 SourceLocation Loc = DS.getSourceRange().getBegin(); 4589 4590 assert(DS.isFriendSpecified()); 4591 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 4592 4593 // Try to convert the decl specifier to a type. This works for 4594 // friend templates because ActOnTag never produces a ClassTemplateDecl 4595 // for a TUK_Friend. 4596 Declarator TheDeclarator(DS, Declarator::MemberContext); 4597 QualType T = GetTypeForDeclarator(TheDeclarator, S); 4598 if (TheDeclarator.isInvalidType()) 4599 return DeclPtrTy(); 4600 4601 // This is definitely an error in C++98. It's probably meant to 4602 // be forbidden in C++0x, too, but the specification is just 4603 // poorly written. 4604 // 4605 // The problem is with declarations like the following: 4606 // template <T> friend A<T>::foo; 4607 // where deciding whether a class C is a friend or not now hinges 4608 // on whether there exists an instantiation of A that causes 4609 // 'foo' to equal C. There are restrictions on class-heads 4610 // (which we declare (by fiat) elaborated friend declarations to 4611 // be) that makes this tractable. 4612 // 4613 // FIXME: handle "template <> friend class A<T>;", which 4614 // is possibly well-formed? Who even knows? 4615 if (TempParams.size() && !isa<ElaboratedType>(T)) { 4616 Diag(Loc, diag::err_tagless_friend_type_template) 4617 << DS.getSourceRange(); 4618 return DeclPtrTy(); 4619 } 4620 4621 // C++ [class.friend]p2: 4622 // An elaborated-type-specifier shall be used in a friend declaration 4623 // for a class.* 4624 // * The class-key of the elaborated-type-specifier is required. 4625 // This is one of the rare places in Clang where it's legitimate to 4626 // ask about the "spelling" of the type. 4627 if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) { 4628 // If we evaluated the type to a record type, suggest putting 4629 // a tag in front. 4630 if (const RecordType *RT = T->getAs<RecordType>()) { 4631 RecordDecl *RD = RT->getDecl(); 4632 4633 std::string InsertionText = std::string(" ") + RD->getKindName(); 4634 4635 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 4636 << (unsigned) RD->getTagKind() 4637 << T 4638 << SourceRange(DS.getFriendSpecLoc()) 4639 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 4640 InsertionText); 4641 return DeclPtrTy(); 4642 }else { 4643 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 4644 << DS.getSourceRange(); 4645 return DeclPtrTy(); 4646 } 4647 } 4648 4649 // Enum types cannot be friends. 4650 if (T->getAs<EnumType>()) { 4651 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 4652 << SourceRange(DS.getFriendSpecLoc()); 4653 return DeclPtrTy(); 4654 } 4655 4656 // C++98 [class.friend]p1: A friend of a class is a function 4657 // or class that is not a member of the class . . . 4658 // But that's a silly restriction which nobody implements for 4659 // inner classes, and C++0x removes it anyway, so we only report 4660 // this (as a warning) if we're being pedantic. 4661 if (!getLangOptions().CPlusPlus0x) 4662 if (const RecordType *RT = T->getAs<RecordType>()) 4663 if (RT->getDecl()->getDeclContext() == CurContext) 4664 Diag(DS.getFriendSpecLoc(), diag::ext_friend_inner_class); 4665 4666 Decl *D; 4667 if (TempParams.size()) 4668 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 4669 TempParams.size(), 4670 (TemplateParameterList**) TempParams.release(), 4671 T.getTypePtr(), 4672 DS.getFriendSpecLoc()); 4673 else 4674 D = FriendDecl::Create(Context, CurContext, Loc, T.getTypePtr(), 4675 DS.getFriendSpecLoc()); 4676 D->setAccess(AS_public); 4677 CurContext->addDecl(D); 4678 4679 return DeclPtrTy::make(D); 4680} 4681 4682Sema::DeclPtrTy 4683Sema::ActOnFriendFunctionDecl(Scope *S, 4684 Declarator &D, 4685 bool IsDefinition, 4686 MultiTemplateParamsArg TemplateParams) { 4687 const DeclSpec &DS = D.getDeclSpec(); 4688 4689 assert(DS.isFriendSpecified()); 4690 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 4691 4692 SourceLocation Loc = D.getIdentifierLoc(); 4693 TypeSourceInfo *TInfo = 0; 4694 QualType T = GetTypeForDeclarator(D, S, &TInfo); 4695 4696 // C++ [class.friend]p1 4697 // A friend of a class is a function or class.... 4698 // Note that this sees through typedefs, which is intended. 4699 // It *doesn't* see through dependent types, which is correct 4700 // according to [temp.arg.type]p3: 4701 // If a declaration acquires a function type through a 4702 // type dependent on a template-parameter and this causes 4703 // a declaration that does not use the syntactic form of a 4704 // function declarator to have a function type, the program 4705 // is ill-formed. 4706 if (!T->isFunctionType()) { 4707 Diag(Loc, diag::err_unexpected_friend); 4708 4709 // It might be worthwhile to try to recover by creating an 4710 // appropriate declaration. 4711 return DeclPtrTy(); 4712 } 4713 4714 // C++ [namespace.memdef]p3 4715 // - If a friend declaration in a non-local class first declares a 4716 // class or function, the friend class or function is a member 4717 // of the innermost enclosing namespace. 4718 // - The name of the friend is not found by simple name lookup 4719 // until a matching declaration is provided in that namespace 4720 // scope (either before or after the class declaration granting 4721 // friendship). 4722 // - If a friend function is called, its name may be found by the 4723 // name lookup that considers functions from namespaces and 4724 // classes associated with the types of the function arguments. 4725 // - When looking for a prior declaration of a class or a function 4726 // declared as a friend, scopes outside the innermost enclosing 4727 // namespace scope are not considered. 4728 4729 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 4730 DeclarationName Name = GetNameForDeclarator(D); 4731 assert(Name); 4732 4733 // The context we found the declaration in, or in which we should 4734 // create the declaration. 4735 DeclContext *DC; 4736 4737 // FIXME: handle local classes 4738 4739 // Recover from invalid scope qualifiers as if they just weren't there. 4740 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 4741 ForRedeclaration); 4742 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 4743 // FIXME: RequireCompleteDeclContext 4744 DC = computeDeclContext(ScopeQual); 4745 4746 // FIXME: handle dependent contexts 4747 if (!DC) return DeclPtrTy(); 4748 4749 LookupQualifiedName(Previous, DC); 4750 4751 // If searching in that context implicitly found a declaration in 4752 // a different context, treat it like it wasn't found at all. 4753 // TODO: better diagnostics for this case. Suggesting the right 4754 // qualified scope would be nice... 4755 // FIXME: getRepresentativeDecl() is not right here at all 4756 if (Previous.empty() || 4757 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 4758 D.setInvalidType(); 4759 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 4760 return DeclPtrTy(); 4761 } 4762 4763 // C++ [class.friend]p1: A friend of a class is a function or 4764 // class that is not a member of the class . . . 4765 if (DC->Equals(CurContext)) 4766 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 4767 4768 // Otherwise walk out to the nearest namespace scope looking for matches. 4769 } else { 4770 // TODO: handle local class contexts. 4771 4772 DC = CurContext; 4773 while (true) { 4774 // Skip class contexts. If someone can cite chapter and verse 4775 // for this behavior, that would be nice --- it's what GCC and 4776 // EDG do, and it seems like a reasonable intent, but the spec 4777 // really only says that checks for unqualified existing 4778 // declarations should stop at the nearest enclosing namespace, 4779 // not that they should only consider the nearest enclosing 4780 // namespace. 4781 while (DC->isRecord()) 4782 DC = DC->getParent(); 4783 4784 LookupQualifiedName(Previous, DC); 4785 4786 // TODO: decide what we think about using declarations. 4787 if (!Previous.empty()) 4788 break; 4789 4790 if (DC->isFileContext()) break; 4791 DC = DC->getParent(); 4792 } 4793 4794 // C++ [class.friend]p1: A friend of a class is a function or 4795 // class that is not a member of the class . . . 4796 // C++0x changes this for both friend types and functions. 4797 // Most C++ 98 compilers do seem to give an error here, so 4798 // we do, too. 4799 if (!Previous.empty() && DC->Equals(CurContext) 4800 && !getLangOptions().CPlusPlus0x) 4801 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 4802 } 4803 4804 if (DC->isFileContext()) { 4805 // This implies that it has to be an operator or function. 4806 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 4807 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 4808 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 4809 Diag(Loc, diag::err_introducing_special_friend) << 4810 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 4811 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 4812 return DeclPtrTy(); 4813 } 4814 } 4815 4816 bool Redeclaration = false; 4817 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 4818 move(TemplateParams), 4819 IsDefinition, 4820 Redeclaration); 4821 if (!ND) return DeclPtrTy(); 4822 4823 assert(ND->getDeclContext() == DC); 4824 assert(ND->getLexicalDeclContext() == CurContext); 4825 4826 // Add the function declaration to the appropriate lookup tables, 4827 // adjusting the redeclarations list as necessary. We don't 4828 // want to do this yet if the friending class is dependent. 4829 // 4830 // Also update the scope-based lookup if the target context's 4831 // lookup context is in lexical scope. 4832 if (!CurContext->isDependentContext()) { 4833 DC = DC->getLookupContext(); 4834 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 4835 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 4836 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 4837 } 4838 4839 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 4840 D.getIdentifierLoc(), ND, 4841 DS.getFriendSpecLoc()); 4842 FrD->setAccess(AS_public); 4843 CurContext->addDecl(FrD); 4844 4845 return DeclPtrTy::make(ND); 4846} 4847 4848void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 4849 AdjustDeclIfTemplate(dcl); 4850 4851 Decl *Dcl = dcl.getAs<Decl>(); 4852 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 4853 if (!Fn) { 4854 Diag(DelLoc, diag::err_deleted_non_function); 4855 return; 4856 } 4857 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 4858 Diag(DelLoc, diag::err_deleted_decl_not_first); 4859 Diag(Prev->getLocation(), diag::note_previous_declaration); 4860 // If the declaration wasn't the first, we delete the function anyway for 4861 // recovery. 4862 } 4863 Fn->setDeleted(); 4864} 4865 4866static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 4867 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 4868 ++CI) { 4869 Stmt *SubStmt = *CI; 4870 if (!SubStmt) 4871 continue; 4872 if (isa<ReturnStmt>(SubStmt)) 4873 Self.Diag(SubStmt->getSourceRange().getBegin(), 4874 diag::err_return_in_constructor_handler); 4875 if (!isa<Expr>(SubStmt)) 4876 SearchForReturnInStmt(Self, SubStmt); 4877 } 4878} 4879 4880void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 4881 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 4882 CXXCatchStmt *Handler = TryBlock->getHandler(I); 4883 SearchForReturnInStmt(*this, Handler); 4884 } 4885} 4886 4887bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 4888 const CXXMethodDecl *Old) { 4889 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 4890 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 4891 4892 QualType CNewTy = Context.getCanonicalType(NewTy); 4893 QualType COldTy = Context.getCanonicalType(OldTy); 4894 4895 if (CNewTy == COldTy && 4896 CNewTy.getLocalCVRQualifiers() == COldTy.getLocalCVRQualifiers()) 4897 return false; 4898 4899 // Check if the return types are covariant 4900 QualType NewClassTy, OldClassTy; 4901 4902 /// Both types must be pointers or references to classes. 4903 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 4904 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 4905 NewClassTy = NewPT->getPointeeType(); 4906 OldClassTy = OldPT->getPointeeType(); 4907 } 4908 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 4909 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 4910 NewClassTy = NewRT->getPointeeType(); 4911 OldClassTy = OldRT->getPointeeType(); 4912 } 4913 } 4914 4915 // The return types aren't either both pointers or references to a class type. 4916 if (NewClassTy.isNull()) { 4917 Diag(New->getLocation(), 4918 diag::err_different_return_type_for_overriding_virtual_function) 4919 << New->getDeclName() << NewTy << OldTy; 4920 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4921 4922 return true; 4923 } 4924 4925 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 4926 // Check if the new class derives from the old class. 4927 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 4928 Diag(New->getLocation(), 4929 diag::err_covariant_return_not_derived) 4930 << New->getDeclName() << NewTy << OldTy; 4931 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4932 return true; 4933 } 4934 4935 // Check if we the conversion from derived to base is valid. 4936 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 4937 diag::err_covariant_return_inaccessible_base, 4938 diag::err_covariant_return_ambiguous_derived_to_base_conv, 4939 // FIXME: Should this point to the return type? 4940 New->getLocation(), SourceRange(), New->getDeclName())) { 4941 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4942 return true; 4943 } 4944 } 4945 4946 // The qualifiers of the return types must be the same. 4947 if (CNewTy.getLocalCVRQualifiers() != COldTy.getLocalCVRQualifiers()) { 4948 Diag(New->getLocation(), 4949 diag::err_covariant_return_type_different_qualifications) 4950 << New->getDeclName() << NewTy << OldTy; 4951 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4952 return true; 4953 }; 4954 4955 4956 // The new class type must have the same or less qualifiers as the old type. 4957 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 4958 Diag(New->getLocation(), 4959 diag::err_covariant_return_type_class_type_more_qualified) 4960 << New->getDeclName() << NewTy << OldTy; 4961 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4962 return true; 4963 }; 4964 4965 return false; 4966} 4967 4968bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 4969 const CXXMethodDecl *Old) 4970{ 4971 if (Old->hasAttr<FinalAttr>()) { 4972 Diag(New->getLocation(), diag::err_final_function_overridden) 4973 << New->getDeclName(); 4974 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4975 return true; 4976 } 4977 4978 return false; 4979} 4980 4981/// \brief Mark the given method pure. 4982/// 4983/// \param Method the method to be marked pure. 4984/// 4985/// \param InitRange the source range that covers the "0" initializer. 4986bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 4987 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 4988 Method->setPure(); 4989 4990 // A class is abstract if at least one function is pure virtual. 4991 Method->getParent()->setAbstract(true); 4992 return false; 4993 } 4994 4995 if (!Method->isInvalidDecl()) 4996 Diag(Method->getLocation(), diag::err_non_virtual_pure) 4997 << Method->getDeclName() << InitRange; 4998 return true; 4999} 5000 5001/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 5002/// initializer for the declaration 'Dcl'. 5003/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5004/// static data member of class X, names should be looked up in the scope of 5005/// class X. 5006void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5007 AdjustDeclIfTemplate(Dcl); 5008 5009 Decl *D = Dcl.getAs<Decl>(); 5010 // If there is no declaration, there was an error parsing it. 5011 if (D == 0) 5012 return; 5013 5014 // Check whether it is a declaration with a nested name specifier like 5015 // int foo::bar; 5016 if (!D->isOutOfLine()) 5017 return; 5018 5019 // C++ [basic.lookup.unqual]p13 5020 // 5021 // A name used in the definition of a static data member of class X 5022 // (after the qualified-id of the static member) is looked up as if the name 5023 // was used in a member function of X. 5024 5025 // Change current context into the context of the initializing declaration. 5026 EnterDeclaratorContext(S, D->getDeclContext()); 5027} 5028 5029/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5030/// initializer for the declaration 'Dcl'. 5031void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5032 AdjustDeclIfTemplate(Dcl); 5033 5034 Decl *D = Dcl.getAs<Decl>(); 5035 // If there is no declaration, there was an error parsing it. 5036 if (D == 0) 5037 return; 5038 5039 // Check whether it is a declaration with a nested name specifier like 5040 // int foo::bar; 5041 if (!D->isOutOfLine()) 5042 return; 5043 5044 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 5045 ExitDeclaratorContext(S); 5046} 5047 5048/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5049/// C++ if/switch/while/for statement. 5050/// e.g: "if (int x = f()) {...}" 5051Action::DeclResult 5052Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5053 // C++ 6.4p2: 5054 // The declarator shall not specify a function or an array. 5055 // The type-specifier-seq shall not contain typedef and shall not declare a 5056 // new class or enumeration. 5057 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5058 "Parser allowed 'typedef' as storage class of condition decl."); 5059 5060 TypeSourceInfo *TInfo = 0; 5061 TagDecl *OwnedTag = 0; 5062 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5063 5064 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5065 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5066 // would be created and CXXConditionDeclExpr wants a VarDecl. 5067 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5068 << D.getSourceRange(); 5069 return DeclResult(); 5070 } else if (OwnedTag && OwnedTag->isDefinition()) { 5071 // The type-specifier-seq shall not declare a new class or enumeration. 5072 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5073 } 5074 5075 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5076 if (!Dcl) 5077 return DeclResult(); 5078 5079 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5080 VD->setDeclaredInCondition(true); 5081 return Dcl; 5082} 5083 5084void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5085 CXXMethodDecl *MD) { 5086 // Ignore dependent types. 5087 if (MD->isDependentContext()) 5088 return; 5089 5090 CXXRecordDecl *RD = MD->getParent(); 5091 5092 // Ignore classes without a vtable. 5093 if (!RD->isDynamicClass()) 5094 return; 5095 5096 if (!MD->isOutOfLine()) { 5097 // The only inline functions we care about are constructors. We also defer 5098 // marking the virtual members as referenced until we've reached the end 5099 // of the translation unit. We do this because we need to know the key 5100 // function of the class in order to determine the key function. 5101 if (isa<CXXConstructorDecl>(MD)) 5102 ClassesWithUnmarkedVirtualMembers.insert(std::make_pair(RD, Loc)); 5103 return; 5104 } 5105 5106 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5107 5108 if (!KeyFunction) { 5109 // This record does not have a key function, so we assume that the vtable 5110 // will be emitted when it's used by the constructor. 5111 if (!isa<CXXConstructorDecl>(MD)) 5112 return; 5113 } else if (KeyFunction->getCanonicalDecl() != MD->getCanonicalDecl()) { 5114 // We don't have the right key function. 5115 return; 5116 } 5117 5118 // Mark the members as referenced. 5119 MarkVirtualMembersReferenced(Loc, RD); 5120 ClassesWithUnmarkedVirtualMembers.erase(RD); 5121} 5122 5123bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5124 if (ClassesWithUnmarkedVirtualMembers.empty()) 5125 return false; 5126 5127 for (std::map<CXXRecordDecl *, SourceLocation>::iterator i = 5128 ClassesWithUnmarkedVirtualMembers.begin(), 5129 e = ClassesWithUnmarkedVirtualMembers.end(); i != e; ++i) { 5130 CXXRecordDecl *RD = i->first; 5131 5132 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5133 if (KeyFunction) { 5134 // We know that the class has a key function. If the key function was 5135 // declared in this translation unit, then it the class decl would not 5136 // have been in the ClassesWithUnmarkedVirtualMembers map. 5137 continue; 5138 } 5139 5140 SourceLocation Loc = i->second; 5141 MarkVirtualMembersReferenced(Loc, RD); 5142 } 5143 5144 ClassesWithUnmarkedVirtualMembers.clear(); 5145 return true; 5146} 5147 5148void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, CXXRecordDecl *RD) { 5149 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5150 e = RD->method_end(); i != e; ++i) { 5151 CXXMethodDecl *MD = *i; 5152 5153 // C++ [basic.def.odr]p2: 5154 // [...] A virtual member function is used if it is not pure. [...] 5155 if (MD->isVirtual() && !MD->isPure()) 5156 MarkDeclarationReferenced(Loc, MD); 5157 } 5158} 5159 5160