SemaDeclCXX.cpp revision 7557a1348d2821dce126a778aa7acd7a00b814fd
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/RecordLayout.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/TypeLoc.h" 23#include "clang/AST/TypeOrdering.h" 24#include "clang/AST/StmtVisitor.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Parse/Template.h" 27#include "clang/Basic/PartialDiagnostic.h" 28#include "clang/Lex/Preprocessor.h" 29#include "llvm/ADT/STLExtras.h" 30#include <map> 31#include <set> 32 33using namespace clang; 34 35//===----------------------------------------------------------------------===// 36// CheckDefaultArgumentVisitor 37//===----------------------------------------------------------------------===// 38 39namespace { 40 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 41 /// the default argument of a parameter to determine whether it 42 /// contains any ill-formed subexpressions. For example, this will 43 /// diagnose the use of local variables or parameters within the 44 /// default argument expression. 45 class CheckDefaultArgumentVisitor 46 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 47 Expr *DefaultArg; 48 Sema *S; 49 50 public: 51 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 52 : DefaultArg(defarg), S(s) {} 53 54 bool VisitExpr(Expr *Node); 55 bool VisitDeclRefExpr(DeclRefExpr *DRE); 56 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 57 }; 58 59 /// VisitExpr - Visit all of the children of this expression. 60 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 61 bool IsInvalid = false; 62 for (Stmt::child_iterator I = Node->child_begin(), 63 E = Node->child_end(); I != E; ++I) 64 IsInvalid |= Visit(*I); 65 return IsInvalid; 66 } 67 68 /// VisitDeclRefExpr - Visit a reference to a declaration, to 69 /// determine whether this declaration can be used in the default 70 /// argument expression. 71 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 72 NamedDecl *Decl = DRE->getDecl(); 73 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 74 // C++ [dcl.fct.default]p9 75 // Default arguments are evaluated each time the function is 76 // called. The order of evaluation of function arguments is 77 // unspecified. Consequently, parameters of a function shall not 78 // be used in default argument expressions, even if they are not 79 // evaluated. Parameters of a function declared before a default 80 // argument expression are in scope and can hide namespace and 81 // class member names. 82 return S->Diag(DRE->getSourceRange().getBegin(), 83 diag::err_param_default_argument_references_param) 84 << Param->getDeclName() << DefaultArg->getSourceRange(); 85 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 86 // C++ [dcl.fct.default]p7 87 // Local variables shall not be used in default argument 88 // expressions. 89 if (VDecl->isBlockVarDecl()) 90 return S->Diag(DRE->getSourceRange().getBegin(), 91 diag::err_param_default_argument_references_local) 92 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 93 } 94 95 return false; 96 } 97 98 /// VisitCXXThisExpr - Visit a C++ "this" expression. 99 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 100 // C++ [dcl.fct.default]p8: 101 // The keyword this shall not be used in a default argument of a 102 // member function. 103 return S->Diag(ThisE->getSourceRange().getBegin(), 104 diag::err_param_default_argument_references_this) 105 << ThisE->getSourceRange(); 106 } 107} 108 109bool 110Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 111 SourceLocation EqualLoc) { 112 QualType ParamType = Param->getType(); 113 114 if (RequireCompleteType(Param->getLocation(), Param->getType(), 115 diag::err_typecheck_decl_incomplete_type)) { 116 Param->setInvalidDecl(); 117 return true; 118 } 119 120 Expr *Arg = (Expr *)DefaultArg.get(); 121 122 // C++ [dcl.fct.default]p5 123 // A default argument expression is implicitly converted (clause 124 // 4) to the parameter type. The default argument expression has 125 // the same semantic constraints as the initializer expression in 126 // a declaration of a variable of the parameter type, using the 127 // copy-initialization semantics (8.5). 128 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 129 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 130 EqualLoc); 131 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 132 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 133 MultiExprArg(*this, (void**)&Arg, 1)); 134 if (Result.isInvalid()) 135 return true; 136 Arg = Result.takeAs<Expr>(); 137 138 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 139 140 // Okay: add the default argument to the parameter 141 Param->setDefaultArg(Arg); 142 143 DefaultArg.release(); 144 145 return false; 146} 147 148/// ActOnParamDefaultArgument - Check whether the default argument 149/// provided for a function parameter is well-formed. If so, attach it 150/// to the parameter declaration. 151void 152Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 153 ExprArg defarg) { 154 if (!param || !defarg.get()) 155 return; 156 157 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 158 UnparsedDefaultArgLocs.erase(Param); 159 160 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 161 QualType ParamType = Param->getType(); 162 163 // Default arguments are only permitted in C++ 164 if (!getLangOptions().CPlusPlus) { 165 Diag(EqualLoc, diag::err_param_default_argument) 166 << DefaultArg->getSourceRange(); 167 Param->setInvalidDecl(); 168 return; 169 } 170 171 // Check that the default argument is well-formed 172 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 173 if (DefaultArgChecker.Visit(DefaultArg.get())) { 174 Param->setInvalidDecl(); 175 return; 176 } 177 178 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 179} 180 181/// ActOnParamUnparsedDefaultArgument - We've seen a default 182/// argument for a function parameter, but we can't parse it yet 183/// because we're inside a class definition. Note that this default 184/// argument will be parsed later. 185void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 186 SourceLocation EqualLoc, 187 SourceLocation ArgLoc) { 188 if (!param) 189 return; 190 191 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 192 if (Param) 193 Param->setUnparsedDefaultArg(); 194 195 UnparsedDefaultArgLocs[Param] = ArgLoc; 196} 197 198/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 199/// the default argument for the parameter param failed. 200void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 201 if (!param) 202 return; 203 204 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 205 206 Param->setInvalidDecl(); 207 208 UnparsedDefaultArgLocs.erase(Param); 209} 210 211/// CheckExtraCXXDefaultArguments - Check for any extra default 212/// arguments in the declarator, which is not a function declaration 213/// or definition and therefore is not permitted to have default 214/// arguments. This routine should be invoked for every declarator 215/// that is not a function declaration or definition. 216void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 217 // C++ [dcl.fct.default]p3 218 // A default argument expression shall be specified only in the 219 // parameter-declaration-clause of a function declaration or in a 220 // template-parameter (14.1). It shall not be specified for a 221 // parameter pack. If it is specified in a 222 // parameter-declaration-clause, it shall not occur within a 223 // declarator or abstract-declarator of a parameter-declaration. 224 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 225 DeclaratorChunk &chunk = D.getTypeObject(i); 226 if (chunk.Kind == DeclaratorChunk::Function) { 227 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 228 ParmVarDecl *Param = 229 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 230 if (Param->hasUnparsedDefaultArg()) { 231 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 232 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 233 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 234 delete Toks; 235 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 236 } else if (Param->getDefaultArg()) { 237 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 238 << Param->getDefaultArg()->getSourceRange(); 239 Param->setDefaultArg(0); 240 } 241 } 242 } 243 } 244} 245 246// MergeCXXFunctionDecl - Merge two declarations of the same C++ 247// function, once we already know that they have the same 248// type. Subroutine of MergeFunctionDecl. Returns true if there was an 249// error, false otherwise. 250bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 251 bool Invalid = false; 252 253 // C++ [dcl.fct.default]p4: 254 // For non-template functions, default arguments can be added in 255 // later declarations of a function in the same 256 // scope. Declarations in different scopes have completely 257 // distinct sets of default arguments. That is, declarations in 258 // inner scopes do not acquire default arguments from 259 // declarations in outer scopes, and vice versa. In a given 260 // function declaration, all parameters subsequent to a 261 // parameter with a default argument shall have default 262 // arguments supplied in this or previous declarations. A 263 // default argument shall not be redefined by a later 264 // declaration (not even to the same value). 265 // 266 // C++ [dcl.fct.default]p6: 267 // Except for member functions of class templates, the default arguments 268 // in a member function definition that appears outside of the class 269 // definition are added to the set of default arguments provided by the 270 // member function declaration in the class definition. 271 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 272 ParmVarDecl *OldParam = Old->getParamDecl(p); 273 ParmVarDecl *NewParam = New->getParamDecl(p); 274 275 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 276 // FIXME: If the parameter doesn't have an identifier then the location 277 // points to the '=' which means that the fixit hint won't remove any 278 // extra spaces between the type and the '='. 279 SourceLocation Begin = NewParam->getLocation(); 280 if (NewParam->getIdentifier()) 281 Begin = PP.getLocForEndOfToken(Begin); 282 283 Diag(NewParam->getLocation(), 284 diag::err_param_default_argument_redefinition) 285 << NewParam->getDefaultArgRange() 286 << CodeModificationHint::CreateRemoval(SourceRange(Begin, 287 NewParam->getLocEnd())); 288 289 // Look for the function declaration where the default argument was 290 // actually written, which may be a declaration prior to Old. 291 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 292 Older; Older = Older->getPreviousDeclaration()) { 293 if (!Older->getParamDecl(p)->hasDefaultArg()) 294 break; 295 296 OldParam = Older->getParamDecl(p); 297 } 298 299 Diag(OldParam->getLocation(), diag::note_previous_definition) 300 << OldParam->getDefaultArgRange(); 301 Invalid = true; 302 } else if (OldParam->hasDefaultArg()) { 303 // Merge the old default argument into the new parameter 304 if (OldParam->hasUninstantiatedDefaultArg()) 305 NewParam->setUninstantiatedDefaultArg( 306 OldParam->getUninstantiatedDefaultArg()); 307 else 308 NewParam->setDefaultArg(OldParam->getDefaultArg()); 309 } else if (NewParam->hasDefaultArg()) { 310 if (New->getDescribedFunctionTemplate()) { 311 // Paragraph 4, quoted above, only applies to non-template functions. 312 Diag(NewParam->getLocation(), 313 diag::err_param_default_argument_template_redecl) 314 << NewParam->getDefaultArgRange(); 315 Diag(Old->getLocation(), diag::note_template_prev_declaration) 316 << false; 317 } else if (New->getTemplateSpecializationKind() 318 != TSK_ImplicitInstantiation && 319 New->getTemplateSpecializationKind() != TSK_Undeclared) { 320 // C++ [temp.expr.spec]p21: 321 // Default function arguments shall not be specified in a declaration 322 // or a definition for one of the following explicit specializations: 323 // - the explicit specialization of a function template; 324 // - the explicit specialization of a member function template; 325 // - the explicit specialization of a member function of a class 326 // template where the class template specialization to which the 327 // member function specialization belongs is implicitly 328 // instantiated. 329 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 330 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 331 << New->getDeclName() 332 << NewParam->getDefaultArgRange(); 333 } else if (New->getDeclContext()->isDependentContext()) { 334 // C++ [dcl.fct.default]p6 (DR217): 335 // Default arguments for a member function of a class template shall 336 // be specified on the initial declaration of the member function 337 // within the class template. 338 // 339 // Reading the tea leaves a bit in DR217 and its reference to DR205 340 // leads me to the conclusion that one cannot add default function 341 // arguments for an out-of-line definition of a member function of a 342 // dependent type. 343 int WhichKind = 2; 344 if (CXXRecordDecl *Record 345 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 346 if (Record->getDescribedClassTemplate()) 347 WhichKind = 0; 348 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 349 WhichKind = 1; 350 else 351 WhichKind = 2; 352 } 353 354 Diag(NewParam->getLocation(), 355 diag::err_param_default_argument_member_template_redecl) 356 << WhichKind 357 << NewParam->getDefaultArgRange(); 358 } 359 } 360 } 361 362 if (CheckEquivalentExceptionSpec( 363 Old->getType()->getAs<FunctionProtoType>(), Old->getLocation(), 364 New->getType()->getAs<FunctionProtoType>(), New->getLocation())) 365 Invalid = true; 366 367 return Invalid; 368} 369 370/// CheckCXXDefaultArguments - Verify that the default arguments for a 371/// function declaration are well-formed according to C++ 372/// [dcl.fct.default]. 373void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 374 unsigned NumParams = FD->getNumParams(); 375 unsigned p; 376 377 // Find first parameter with a default argument 378 for (p = 0; p < NumParams; ++p) { 379 ParmVarDecl *Param = FD->getParamDecl(p); 380 if (Param->hasDefaultArg()) 381 break; 382 } 383 384 // C++ [dcl.fct.default]p4: 385 // In a given function declaration, all parameters 386 // subsequent to a parameter with a default argument shall 387 // have default arguments supplied in this or previous 388 // declarations. A default argument shall not be redefined 389 // by a later declaration (not even to the same value). 390 unsigned LastMissingDefaultArg = 0; 391 for (; p < NumParams; ++p) { 392 ParmVarDecl *Param = FD->getParamDecl(p); 393 if (!Param->hasDefaultArg()) { 394 if (Param->isInvalidDecl()) 395 /* We already complained about this parameter. */; 396 else if (Param->getIdentifier()) 397 Diag(Param->getLocation(), 398 diag::err_param_default_argument_missing_name) 399 << Param->getIdentifier(); 400 else 401 Diag(Param->getLocation(), 402 diag::err_param_default_argument_missing); 403 404 LastMissingDefaultArg = p; 405 } 406 } 407 408 if (LastMissingDefaultArg > 0) { 409 // Some default arguments were missing. Clear out all of the 410 // default arguments up to (and including) the last missing 411 // default argument, so that we leave the function parameters 412 // in a semantically valid state. 413 for (p = 0; p <= LastMissingDefaultArg; ++p) { 414 ParmVarDecl *Param = FD->getParamDecl(p); 415 if (Param->hasDefaultArg()) { 416 if (!Param->hasUnparsedDefaultArg()) 417 Param->getDefaultArg()->Destroy(Context); 418 Param->setDefaultArg(0); 419 } 420 } 421 } 422} 423 424/// isCurrentClassName - Determine whether the identifier II is the 425/// name of the class type currently being defined. In the case of 426/// nested classes, this will only return true if II is the name of 427/// the innermost class. 428bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 429 const CXXScopeSpec *SS) { 430 CXXRecordDecl *CurDecl; 431 if (SS && SS->isSet() && !SS->isInvalid()) { 432 DeclContext *DC = computeDeclContext(*SS, true); 433 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 434 } else 435 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 436 437 if (CurDecl) 438 return &II == CurDecl->getIdentifier(); 439 else 440 return false; 441} 442 443/// \brief Check the validity of a C++ base class specifier. 444/// 445/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 446/// and returns NULL otherwise. 447CXXBaseSpecifier * 448Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 449 SourceRange SpecifierRange, 450 bool Virtual, AccessSpecifier Access, 451 QualType BaseType, 452 SourceLocation BaseLoc) { 453 // C++ [class.union]p1: 454 // A union shall not have base classes. 455 if (Class->isUnion()) { 456 Diag(Class->getLocation(), diag::err_base_clause_on_union) 457 << SpecifierRange; 458 return 0; 459 } 460 461 if (BaseType->isDependentType()) 462 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 463 Class->getTagKind() == RecordDecl::TK_class, 464 Access, BaseType); 465 466 // Base specifiers must be record types. 467 if (!BaseType->isRecordType()) { 468 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 469 return 0; 470 } 471 472 // C++ [class.union]p1: 473 // A union shall not be used as a base class. 474 if (BaseType->isUnionType()) { 475 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 476 return 0; 477 } 478 479 // C++ [class.derived]p2: 480 // The class-name in a base-specifier shall not be an incompletely 481 // defined class. 482 if (RequireCompleteType(BaseLoc, BaseType, 483 PDiag(diag::err_incomplete_base_class) 484 << SpecifierRange)) 485 return 0; 486 487 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 488 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 489 assert(BaseDecl && "Record type has no declaration"); 490 BaseDecl = BaseDecl->getDefinition(Context); 491 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 492 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 493 assert(CXXBaseDecl && "Base type is not a C++ type"); 494 495 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 496 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 497 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 498 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 499 << BaseType; 500 return 0; 501 } 502 503 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 504 505 // Create the base specifier. 506 // FIXME: Allocate via ASTContext? 507 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 508 Class->getTagKind() == RecordDecl::TK_class, 509 Access, BaseType); 510} 511 512void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 513 const CXXRecordDecl *BaseClass, 514 bool BaseIsVirtual) { 515 // A class with a non-empty base class is not empty. 516 // FIXME: Standard ref? 517 if (!BaseClass->isEmpty()) 518 Class->setEmpty(false); 519 520 // C++ [class.virtual]p1: 521 // A class that [...] inherits a virtual function is called a polymorphic 522 // class. 523 if (BaseClass->isPolymorphic()) 524 Class->setPolymorphic(true); 525 526 // C++ [dcl.init.aggr]p1: 527 // An aggregate is [...] a class with [...] no base classes [...]. 528 Class->setAggregate(false); 529 530 // C++ [class]p4: 531 // A POD-struct is an aggregate class... 532 Class->setPOD(false); 533 534 if (BaseIsVirtual) { 535 // C++ [class.ctor]p5: 536 // A constructor is trivial if its class has no virtual base classes. 537 Class->setHasTrivialConstructor(false); 538 539 // C++ [class.copy]p6: 540 // A copy constructor is trivial if its class has no virtual base classes. 541 Class->setHasTrivialCopyConstructor(false); 542 543 // C++ [class.copy]p11: 544 // A copy assignment operator is trivial if its class has no virtual 545 // base classes. 546 Class->setHasTrivialCopyAssignment(false); 547 548 // C++0x [meta.unary.prop] is_empty: 549 // T is a class type, but not a union type, with ... no virtual base 550 // classes 551 Class->setEmpty(false); 552 } else { 553 // C++ [class.ctor]p5: 554 // A constructor is trivial if all the direct base classes of its 555 // class have trivial constructors. 556 if (!BaseClass->hasTrivialConstructor()) 557 Class->setHasTrivialConstructor(false); 558 559 // C++ [class.copy]p6: 560 // A copy constructor is trivial if all the direct base classes of its 561 // class have trivial copy constructors. 562 if (!BaseClass->hasTrivialCopyConstructor()) 563 Class->setHasTrivialCopyConstructor(false); 564 565 // C++ [class.copy]p11: 566 // A copy assignment operator is trivial if all the direct base classes 567 // of its class have trivial copy assignment operators. 568 if (!BaseClass->hasTrivialCopyAssignment()) 569 Class->setHasTrivialCopyAssignment(false); 570 } 571 572 // C++ [class.ctor]p3: 573 // A destructor is trivial if all the direct base classes of its class 574 // have trivial destructors. 575 if (!BaseClass->hasTrivialDestructor()) 576 Class->setHasTrivialDestructor(false); 577} 578 579/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 580/// one entry in the base class list of a class specifier, for 581/// example: 582/// class foo : public bar, virtual private baz { 583/// 'public bar' and 'virtual private baz' are each base-specifiers. 584Sema::BaseResult 585Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 586 bool Virtual, AccessSpecifier Access, 587 TypeTy *basetype, SourceLocation BaseLoc) { 588 if (!classdecl) 589 return true; 590 591 AdjustDeclIfTemplate(classdecl); 592 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 593 QualType BaseType = GetTypeFromParser(basetype); 594 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 595 Virtual, Access, 596 BaseType, BaseLoc)) 597 return BaseSpec; 598 599 return true; 600} 601 602/// \brief Performs the actual work of attaching the given base class 603/// specifiers to a C++ class. 604bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 605 unsigned NumBases) { 606 if (NumBases == 0) 607 return false; 608 609 // Used to keep track of which base types we have already seen, so 610 // that we can properly diagnose redundant direct base types. Note 611 // that the key is always the unqualified canonical type of the base 612 // class. 613 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 614 615 // Copy non-redundant base specifiers into permanent storage. 616 unsigned NumGoodBases = 0; 617 bool Invalid = false; 618 for (unsigned idx = 0; idx < NumBases; ++idx) { 619 QualType NewBaseType 620 = Context.getCanonicalType(Bases[idx]->getType()); 621 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 622 623 if (KnownBaseTypes[NewBaseType]) { 624 // C++ [class.mi]p3: 625 // A class shall not be specified as a direct base class of a 626 // derived class more than once. 627 Diag(Bases[idx]->getSourceRange().getBegin(), 628 diag::err_duplicate_base_class) 629 << KnownBaseTypes[NewBaseType]->getType() 630 << Bases[idx]->getSourceRange(); 631 632 // Delete the duplicate base class specifier; we're going to 633 // overwrite its pointer later. 634 Context.Deallocate(Bases[idx]); 635 636 Invalid = true; 637 } else { 638 // Okay, add this new base class. 639 KnownBaseTypes[NewBaseType] = Bases[idx]; 640 Bases[NumGoodBases++] = Bases[idx]; 641 } 642 } 643 644 // Attach the remaining base class specifiers to the derived class. 645 Class->setBases(Context, Bases, NumGoodBases); 646 647 // Delete the remaining (good) base class specifiers, since their 648 // data has been copied into the CXXRecordDecl. 649 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 650 Context.Deallocate(Bases[idx]); 651 652 return Invalid; 653} 654 655/// ActOnBaseSpecifiers - Attach the given base specifiers to the 656/// class, after checking whether there are any duplicate base 657/// classes. 658void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 659 unsigned NumBases) { 660 if (!ClassDecl || !Bases || !NumBases) 661 return; 662 663 AdjustDeclIfTemplate(ClassDecl); 664 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 665 (CXXBaseSpecifier**)(Bases), NumBases); 666} 667 668/// \brief Determine whether the type \p Derived is a C++ class that is 669/// derived from the type \p Base. 670bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 671 if (!getLangOptions().CPlusPlus) 672 return false; 673 674 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 675 if (!DerivedRT) 676 return false; 677 678 const RecordType *BaseRT = Base->getAs<RecordType>(); 679 if (!BaseRT) 680 return false; 681 682 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 683 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 684 return DerivedRD->isDerivedFrom(BaseRD); 685} 686 687/// \brief Determine whether the type \p Derived is a C++ class that is 688/// derived from the type \p Base. 689bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 690 if (!getLangOptions().CPlusPlus) 691 return false; 692 693 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 694 if (!DerivedRT) 695 return false; 696 697 const RecordType *BaseRT = Base->getAs<RecordType>(); 698 if (!BaseRT) 699 return false; 700 701 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 702 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 703 return DerivedRD->isDerivedFrom(BaseRD, Paths); 704} 705 706/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 707/// conversion (where Derived and Base are class types) is 708/// well-formed, meaning that the conversion is unambiguous (and 709/// that all of the base classes are accessible). Returns true 710/// and emits a diagnostic if the code is ill-formed, returns false 711/// otherwise. Loc is the location where this routine should point to 712/// if there is an error, and Range is the source range to highlight 713/// if there is an error. 714bool 715Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 716 unsigned InaccessibleBaseID, 717 unsigned AmbigiousBaseConvID, 718 SourceLocation Loc, SourceRange Range, 719 DeclarationName Name) { 720 // First, determine whether the path from Derived to Base is 721 // ambiguous. This is slightly more expensive than checking whether 722 // the Derived to Base conversion exists, because here we need to 723 // explore multiple paths to determine if there is an ambiguity. 724 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 725 /*DetectVirtual=*/false); 726 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 727 assert(DerivationOkay && 728 "Can only be used with a derived-to-base conversion"); 729 (void)DerivationOkay; 730 731 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 732 if (InaccessibleBaseID == 0) 733 return false; 734 // Check that the base class can be accessed. 735 return CheckBaseClassAccess(Derived, Base, InaccessibleBaseID, Paths, Loc, 736 Name); 737 } 738 739 // We know that the derived-to-base conversion is ambiguous, and 740 // we're going to produce a diagnostic. Perform the derived-to-base 741 // search just one more time to compute all of the possible paths so 742 // that we can print them out. This is more expensive than any of 743 // the previous derived-to-base checks we've done, but at this point 744 // performance isn't as much of an issue. 745 Paths.clear(); 746 Paths.setRecordingPaths(true); 747 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 748 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 749 (void)StillOkay; 750 751 // Build up a textual representation of the ambiguous paths, e.g., 752 // D -> B -> A, that will be used to illustrate the ambiguous 753 // conversions in the diagnostic. We only print one of the paths 754 // to each base class subobject. 755 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 756 757 Diag(Loc, AmbigiousBaseConvID) 758 << Derived << Base << PathDisplayStr << Range << Name; 759 return true; 760} 761 762bool 763Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 764 SourceLocation Loc, SourceRange Range, 765 bool IgnoreAccess) { 766 return CheckDerivedToBaseConversion(Derived, Base, 767 IgnoreAccess ? 0 : 768 diag::err_conv_to_inaccessible_base, 769 diag::err_ambiguous_derived_to_base_conv, 770 Loc, Range, DeclarationName()); 771} 772 773 774/// @brief Builds a string representing ambiguous paths from a 775/// specific derived class to different subobjects of the same base 776/// class. 777/// 778/// This function builds a string that can be used in error messages 779/// to show the different paths that one can take through the 780/// inheritance hierarchy to go from the derived class to different 781/// subobjects of a base class. The result looks something like this: 782/// @code 783/// struct D -> struct B -> struct A 784/// struct D -> struct C -> struct A 785/// @endcode 786std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 787 std::string PathDisplayStr; 788 std::set<unsigned> DisplayedPaths; 789 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 790 Path != Paths.end(); ++Path) { 791 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 792 // We haven't displayed a path to this particular base 793 // class subobject yet. 794 PathDisplayStr += "\n "; 795 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 796 for (CXXBasePath::const_iterator Element = Path->begin(); 797 Element != Path->end(); ++Element) 798 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 799 } 800 } 801 802 return PathDisplayStr; 803} 804 805//===----------------------------------------------------------------------===// 806// C++ class member Handling 807//===----------------------------------------------------------------------===// 808 809/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 810/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 811/// bitfield width if there is one and 'InitExpr' specifies the initializer if 812/// any. 813Sema::DeclPtrTy 814Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 815 MultiTemplateParamsArg TemplateParameterLists, 816 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 817 bool Deleted) { 818 const DeclSpec &DS = D.getDeclSpec(); 819 DeclarationName Name = GetNameForDeclarator(D); 820 Expr *BitWidth = static_cast<Expr*>(BW); 821 Expr *Init = static_cast<Expr*>(InitExpr); 822 SourceLocation Loc = D.getIdentifierLoc(); 823 824 bool isFunc = D.isFunctionDeclarator(); 825 826 assert(!DS.isFriendSpecified()); 827 828 // C++ 9.2p6: A member shall not be declared to have automatic storage 829 // duration (auto, register) or with the extern storage-class-specifier. 830 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 831 // data members and cannot be applied to names declared const or static, 832 // and cannot be applied to reference members. 833 switch (DS.getStorageClassSpec()) { 834 case DeclSpec::SCS_unspecified: 835 case DeclSpec::SCS_typedef: 836 case DeclSpec::SCS_static: 837 // FALL THROUGH. 838 break; 839 case DeclSpec::SCS_mutable: 840 if (isFunc) { 841 if (DS.getStorageClassSpecLoc().isValid()) 842 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 843 else 844 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 845 846 // FIXME: It would be nicer if the keyword was ignored only for this 847 // declarator. Otherwise we could get follow-up errors. 848 D.getMutableDeclSpec().ClearStorageClassSpecs(); 849 } else { 850 QualType T = GetTypeForDeclarator(D, S); 851 diag::kind err = static_cast<diag::kind>(0); 852 if (T->isReferenceType()) 853 err = diag::err_mutable_reference; 854 else if (T.isConstQualified()) 855 err = diag::err_mutable_const; 856 if (err != 0) { 857 if (DS.getStorageClassSpecLoc().isValid()) 858 Diag(DS.getStorageClassSpecLoc(), err); 859 else 860 Diag(DS.getThreadSpecLoc(), err); 861 // FIXME: It would be nicer if the keyword was ignored only for this 862 // declarator. Otherwise we could get follow-up errors. 863 D.getMutableDeclSpec().ClearStorageClassSpecs(); 864 } 865 } 866 break; 867 default: 868 if (DS.getStorageClassSpecLoc().isValid()) 869 Diag(DS.getStorageClassSpecLoc(), 870 diag::err_storageclass_invalid_for_member); 871 else 872 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 873 D.getMutableDeclSpec().ClearStorageClassSpecs(); 874 } 875 876 if (!isFunc && 877 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 878 D.getNumTypeObjects() == 0) { 879 // Check also for this case: 880 // 881 // typedef int f(); 882 // f a; 883 // 884 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 885 isFunc = TDType->isFunctionType(); 886 } 887 888 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 889 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 890 !isFunc); 891 892 Decl *Member; 893 if (isInstField) { 894 // FIXME: Check for template parameters! 895 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 896 AS); 897 assert(Member && "HandleField never returns null"); 898 } else { 899 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 900 .getAs<Decl>(); 901 if (!Member) { 902 if (BitWidth) DeleteExpr(BitWidth); 903 return DeclPtrTy(); 904 } 905 906 // Non-instance-fields can't have a bitfield. 907 if (BitWidth) { 908 if (Member->isInvalidDecl()) { 909 // don't emit another diagnostic. 910 } else if (isa<VarDecl>(Member)) { 911 // C++ 9.6p3: A bit-field shall not be a static member. 912 // "static member 'A' cannot be a bit-field" 913 Diag(Loc, diag::err_static_not_bitfield) 914 << Name << BitWidth->getSourceRange(); 915 } else if (isa<TypedefDecl>(Member)) { 916 // "typedef member 'x' cannot be a bit-field" 917 Diag(Loc, diag::err_typedef_not_bitfield) 918 << Name << BitWidth->getSourceRange(); 919 } else { 920 // A function typedef ("typedef int f(); f a;"). 921 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 922 Diag(Loc, diag::err_not_integral_type_bitfield) 923 << Name << cast<ValueDecl>(Member)->getType() 924 << BitWidth->getSourceRange(); 925 } 926 927 DeleteExpr(BitWidth); 928 BitWidth = 0; 929 Member->setInvalidDecl(); 930 } 931 932 Member->setAccess(AS); 933 934 // If we have declared a member function template, set the access of the 935 // templated declaration as well. 936 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 937 FunTmpl->getTemplatedDecl()->setAccess(AS); 938 } 939 940 assert((Name || isInstField) && "No identifier for non-field ?"); 941 942 if (Init) 943 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 944 if (Deleted) // FIXME: Source location is not very good. 945 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 946 947 if (isInstField) { 948 FieldCollector->Add(cast<FieldDecl>(Member)); 949 return DeclPtrTy(); 950 } 951 return DeclPtrTy::make(Member); 952} 953 954/// ActOnMemInitializer - Handle a C++ member initializer. 955Sema::MemInitResult 956Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 957 Scope *S, 958 const CXXScopeSpec &SS, 959 IdentifierInfo *MemberOrBase, 960 TypeTy *TemplateTypeTy, 961 SourceLocation IdLoc, 962 SourceLocation LParenLoc, 963 ExprTy **Args, unsigned NumArgs, 964 SourceLocation *CommaLocs, 965 SourceLocation RParenLoc) { 966 if (!ConstructorD) 967 return true; 968 969 AdjustDeclIfTemplate(ConstructorD); 970 971 CXXConstructorDecl *Constructor 972 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 973 if (!Constructor) { 974 // The user wrote a constructor initializer on a function that is 975 // not a C++ constructor. Ignore the error for now, because we may 976 // have more member initializers coming; we'll diagnose it just 977 // once in ActOnMemInitializers. 978 return true; 979 } 980 981 CXXRecordDecl *ClassDecl = Constructor->getParent(); 982 983 // C++ [class.base.init]p2: 984 // Names in a mem-initializer-id are looked up in the scope of the 985 // constructor’s class and, if not found in that scope, are looked 986 // up in the scope containing the constructor’s 987 // definition. [Note: if the constructor’s class contains a member 988 // with the same name as a direct or virtual base class of the 989 // class, a mem-initializer-id naming the member or base class and 990 // composed of a single identifier refers to the class member. A 991 // mem-initializer-id for the hidden base class may be specified 992 // using a qualified name. ] 993 if (!SS.getScopeRep() && !TemplateTypeTy) { 994 // Look for a member, first. 995 FieldDecl *Member = 0; 996 DeclContext::lookup_result Result 997 = ClassDecl->lookup(MemberOrBase); 998 if (Result.first != Result.second) 999 Member = dyn_cast<FieldDecl>(*Result.first); 1000 1001 // FIXME: Handle members of an anonymous union. 1002 1003 if (Member) 1004 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1005 LParenLoc, RParenLoc); 1006 } 1007 // It didn't name a member, so see if it names a class. 1008 QualType BaseType; 1009 TypeSourceInfo *TInfo = 0; 1010 1011 if (TemplateTypeTy) { 1012 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1013 } else { 1014 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1015 LookupParsedName(R, S, &SS); 1016 1017 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1018 if (!TyD) { 1019 if (R.isAmbiguous()) return true; 1020 1021 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1022 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1023 return true; 1024 } 1025 1026 BaseType = Context.getTypeDeclType(TyD); 1027 if (SS.isSet()) { 1028 NestedNameSpecifier *Qualifier = 1029 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1030 1031 // FIXME: preserve source range information 1032 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1033 } 1034 } 1035 1036 if (!TInfo) 1037 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1038 1039 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1040 LParenLoc, RParenLoc, ClassDecl); 1041} 1042 1043/// Checks an initializer expression for use of uninitialized fields, such as 1044/// containing the field that is being initialized. Returns true if there is an 1045/// uninitialized field was used an updates the SourceLocation parameter; false 1046/// otherwise. 1047static bool InitExprContainsUninitializedFields(const Stmt* S, 1048 const FieldDecl* LhsField, 1049 SourceLocation* L) { 1050 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1051 if (ME) { 1052 const NamedDecl* RhsField = ME->getMemberDecl(); 1053 if (RhsField == LhsField) { 1054 // Initializing a field with itself. Throw a warning. 1055 // But wait; there are exceptions! 1056 // Exception #1: The field may not belong to this record. 1057 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1058 const Expr* base = ME->getBase(); 1059 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1060 // Even though the field matches, it does not belong to this record. 1061 return false; 1062 } 1063 // None of the exceptions triggered; return true to indicate an 1064 // uninitialized field was used. 1065 *L = ME->getMemberLoc(); 1066 return true; 1067 } 1068 } 1069 bool found = false; 1070 for (Stmt::const_child_iterator it = S->child_begin(); 1071 it != S->child_end() && found == false; 1072 ++it) { 1073 if (isa<CallExpr>(S)) { 1074 // Do not descend into function calls or constructors, as the use 1075 // of an uninitialized field may be valid. One would have to inspect 1076 // the contents of the function/ctor to determine if it is safe or not. 1077 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1078 // may be safe, depending on what the function/ctor does. 1079 continue; 1080 } 1081 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1082 } 1083 return found; 1084} 1085 1086Sema::MemInitResult 1087Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1088 unsigned NumArgs, SourceLocation IdLoc, 1089 SourceLocation LParenLoc, 1090 SourceLocation RParenLoc) { 1091 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1092 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1093 ExprTemporaries.clear(); 1094 1095 // Diagnose value-uses of fields to initialize themselves, e.g. 1096 // foo(foo) 1097 // where foo is not also a parameter to the constructor. 1098 // TODO: implement -Wuninitialized and fold this into that framework. 1099 for (unsigned i = 0; i < NumArgs; ++i) { 1100 SourceLocation L; 1101 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1102 // FIXME: Return true in the case when other fields are used before being 1103 // uninitialized. For example, let this field be the i'th field. When 1104 // initializing the i'th field, throw a warning if any of the >= i'th 1105 // fields are used, as they are not yet initialized. 1106 // Right now we are only handling the case where the i'th field uses 1107 // itself in its initializer. 1108 Diag(L, diag::warn_field_is_uninit); 1109 } 1110 } 1111 1112 bool HasDependentArg = false; 1113 for (unsigned i = 0; i < NumArgs; i++) 1114 HasDependentArg |= Args[i]->isTypeDependent(); 1115 1116 CXXConstructorDecl *C = 0; 1117 QualType FieldType = Member->getType(); 1118 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1119 FieldType = Array->getElementType(); 1120 if (FieldType->isDependentType()) { 1121 // Can't check init for dependent type. 1122 } else if (FieldType->isRecordType()) { 1123 // Member is a record (struct/union/class), so pass the initializer 1124 // arguments down to the record's constructor. 1125 if (!HasDependentArg) { 1126 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1127 1128 C = PerformInitializationByConstructor(FieldType, 1129 MultiExprArg(*this, 1130 (void**)Args, 1131 NumArgs), 1132 IdLoc, 1133 SourceRange(IdLoc, RParenLoc), 1134 Member->getDeclName(), 1135 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc), 1136 ConstructorArgs); 1137 1138 if (C) { 1139 // Take over the constructor arguments as our own. 1140 NumArgs = ConstructorArgs.size(); 1141 Args = (Expr **)ConstructorArgs.take(); 1142 } 1143 } 1144 } else if (NumArgs != 1 && NumArgs != 0) { 1145 // The member type is not a record type (or an array of record 1146 // types), so it can be only be default- or copy-initialized. 1147 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 1148 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 1149 } else if (!HasDependentArg) { 1150 Expr *NewExp; 1151 if (NumArgs == 0) { 1152 if (FieldType->isReferenceType()) { 1153 Diag(IdLoc, diag::err_null_intialized_reference_member) 1154 << Member->getDeclName(); 1155 return Diag(Member->getLocation(), diag::note_declared_at); 1156 } 1157 NewExp = new (Context) CXXZeroInitValueExpr(FieldType, IdLoc, RParenLoc); 1158 NumArgs = 1; 1159 } 1160 else 1161 NewExp = (Expr*)Args[0]; 1162 if (PerformCopyInitialization(NewExp, FieldType, AA_Passing)) 1163 return true; 1164 Args[0] = NewExp; 1165 } 1166 1167 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1168 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1169 ExprTemporaries.clear(); 1170 1171 // FIXME: Perform direct initialization of the member. 1172 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1173 C, LParenLoc, (Expr **)Args, 1174 NumArgs, RParenLoc); 1175} 1176 1177Sema::MemInitResult 1178Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1179 Expr **Args, unsigned NumArgs, 1180 SourceLocation LParenLoc, SourceLocation RParenLoc, 1181 CXXRecordDecl *ClassDecl) { 1182 bool HasDependentArg = false; 1183 for (unsigned i = 0; i < NumArgs; i++) 1184 HasDependentArg |= Args[i]->isTypeDependent(); 1185 1186 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1187 if (!BaseType->isDependentType()) { 1188 if (!BaseType->isRecordType()) 1189 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1190 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1191 1192 // C++ [class.base.init]p2: 1193 // [...] Unless the mem-initializer-id names a nonstatic data 1194 // member of the constructor’s class or a direct or virtual base 1195 // of that class, the mem-initializer is ill-formed. A 1196 // mem-initializer-list can initialize a base class using any 1197 // name that denotes that base class type. 1198 1199 // First, check for a direct base class. 1200 const CXXBaseSpecifier *DirectBaseSpec = 0; 1201 for (CXXRecordDecl::base_class_const_iterator Base = 1202 ClassDecl->bases_begin(); Base != ClassDecl->bases_end(); ++Base) { 1203 if (Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1204 // We found a direct base of this type. That's what we're 1205 // initializing. 1206 DirectBaseSpec = &*Base; 1207 break; 1208 } 1209 } 1210 1211 // Check for a virtual base class. 1212 // FIXME: We might be able to short-circuit this if we know in advance that 1213 // there are no virtual bases. 1214 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1215 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1216 // We haven't found a base yet; search the class hierarchy for a 1217 // virtual base class. 1218 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1219 /*DetectVirtual=*/false); 1220 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 1221 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1222 Path != Paths.end(); ++Path) { 1223 if (Path->back().Base->isVirtual()) { 1224 VirtualBaseSpec = Path->back().Base; 1225 break; 1226 } 1227 } 1228 } 1229 } 1230 1231 // C++ [base.class.init]p2: 1232 // If a mem-initializer-id is ambiguous because it designates both 1233 // a direct non-virtual base class and an inherited virtual base 1234 // class, the mem-initializer is ill-formed. 1235 if (DirectBaseSpec && VirtualBaseSpec) 1236 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1237 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1238 // C++ [base.class.init]p2: 1239 // Unless the mem-initializer-id names a nonstatic data membeer of the 1240 // constructor's class ot a direst or virtual base of that class, the 1241 // mem-initializer is ill-formed. 1242 if (!DirectBaseSpec && !VirtualBaseSpec) 1243 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1244 << BaseType << ClassDecl->getNameAsCString() 1245 << BaseTInfo->getTypeLoc().getSourceRange(); 1246 } 1247 1248 CXXConstructorDecl *C = 0; 1249 if (!BaseType->isDependentType() && !HasDependentArg) { 1250 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 1251 Context.getCanonicalType(BaseType).getUnqualifiedType()); 1252 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1253 1254 C = PerformInitializationByConstructor(BaseType, 1255 MultiExprArg(*this, 1256 (void**)Args, NumArgs), 1257 BaseLoc, 1258 SourceRange(BaseLoc, RParenLoc), 1259 Name, 1260 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc), 1261 ConstructorArgs); 1262 if (C) { 1263 // Take over the constructor arguments as our own. 1264 NumArgs = ConstructorArgs.size(); 1265 Args = (Expr **)ConstructorArgs.take(); 1266 } 1267 } 1268 1269 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1270 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1271 ExprTemporaries.clear(); 1272 1273 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, C, 1274 LParenLoc, (Expr **)Args, 1275 NumArgs, RParenLoc); 1276} 1277 1278bool 1279Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1280 CXXBaseOrMemberInitializer **Initializers, 1281 unsigned NumInitializers, 1282 bool IsImplicitConstructor) { 1283 // We need to build the initializer AST according to order of construction 1284 // and not what user specified in the Initializers list. 1285 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1286 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1287 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1288 bool HasDependentBaseInit = false; 1289 bool HadError = false; 1290 1291 for (unsigned i = 0; i < NumInitializers; i++) { 1292 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1293 if (Member->isBaseInitializer()) { 1294 if (Member->getBaseClass()->isDependentType()) 1295 HasDependentBaseInit = true; 1296 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1297 } else { 1298 AllBaseFields[Member->getMember()] = Member; 1299 } 1300 } 1301 1302 if (HasDependentBaseInit) { 1303 // FIXME. This does not preserve the ordering of the initializers. 1304 // Try (with -Wreorder) 1305 // template<class X> struct A {}; 1306 // template<class X> struct B : A<X> { 1307 // B() : x1(10), A<X>() {} 1308 // int x1; 1309 // }; 1310 // B<int> x; 1311 // On seeing one dependent type, we should essentially exit this routine 1312 // while preserving user-declared initializer list. When this routine is 1313 // called during instantiatiation process, this routine will rebuild the 1314 // ordered initializer list correctly. 1315 1316 // If we have a dependent base initialization, we can't determine the 1317 // association between initializers and bases; just dump the known 1318 // initializers into the list, and don't try to deal with other bases. 1319 for (unsigned i = 0; i < NumInitializers; i++) { 1320 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1321 if (Member->isBaseInitializer()) 1322 AllToInit.push_back(Member); 1323 } 1324 } else { 1325 // Push virtual bases before others. 1326 for (CXXRecordDecl::base_class_iterator VBase = 1327 ClassDecl->vbases_begin(), 1328 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1329 if (VBase->getType()->isDependentType()) 1330 continue; 1331 if (CXXBaseOrMemberInitializer *Value 1332 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1333 AllToInit.push_back(Value); 1334 } 1335 else { 1336 CXXRecordDecl *VBaseDecl = 1337 cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1338 assert(VBaseDecl && "SetBaseOrMemberInitializers - VBaseDecl null"); 1339 CXXConstructorDecl *Ctor = VBaseDecl->getDefaultConstructor(Context); 1340 if (!Ctor) { 1341 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1342 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1343 << 0 << VBase->getType(); 1344 Diag(VBaseDecl->getLocation(), diag::note_previous_decl) 1345 << Context.getTagDeclType(VBaseDecl); 1346 HadError = true; 1347 continue; 1348 } 1349 1350 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1351 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1352 Constructor->getLocation(), CtorArgs)) 1353 continue; 1354 1355 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1356 1357 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1358 // subexpression so we can wrap it in a CXXExprWithTemporaries if 1359 // necessary. 1360 // FIXME: Is there any better source-location information we can give? 1361 ExprTemporaries.clear(); 1362 CXXBaseOrMemberInitializer *Member = 1363 new (Context) CXXBaseOrMemberInitializer(Context, 1364 Context.getTrivialTypeSourceInfo(VBase->getType(), 1365 SourceLocation()), 1366 Ctor, 1367 SourceLocation(), 1368 CtorArgs.takeAs<Expr>(), 1369 CtorArgs.size(), 1370 SourceLocation()); 1371 AllToInit.push_back(Member); 1372 } 1373 } 1374 1375 for (CXXRecordDecl::base_class_iterator Base = 1376 ClassDecl->bases_begin(), 1377 E = ClassDecl->bases_end(); Base != E; ++Base) { 1378 // Virtuals are in the virtual base list and already constructed. 1379 if (Base->isVirtual()) 1380 continue; 1381 // Skip dependent types. 1382 if (Base->getType()->isDependentType()) 1383 continue; 1384 if (CXXBaseOrMemberInitializer *Value 1385 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1386 AllToInit.push_back(Value); 1387 } 1388 else { 1389 CXXRecordDecl *BaseDecl = 1390 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1391 assert(BaseDecl && "SetBaseOrMemberInitializers - BaseDecl null"); 1392 CXXConstructorDecl *Ctor = BaseDecl->getDefaultConstructor(Context); 1393 if (!Ctor) { 1394 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1395 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1396 << 0 << Base->getType(); 1397 Diag(BaseDecl->getLocation(), diag::note_previous_decl) 1398 << Context.getTagDeclType(BaseDecl); 1399 HadError = true; 1400 continue; 1401 } 1402 1403 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1404 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1405 Constructor->getLocation(), CtorArgs)) 1406 continue; 1407 1408 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1409 1410 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1411 // subexpression so we can wrap it in a CXXExprWithTemporaries if 1412 // necessary. 1413 // FIXME: Is there any better source-location information we can give? 1414 ExprTemporaries.clear(); 1415 CXXBaseOrMemberInitializer *Member = 1416 new (Context) CXXBaseOrMemberInitializer(Context, 1417 Context.getTrivialTypeSourceInfo(Base->getType(), 1418 SourceLocation()), 1419 Ctor, 1420 SourceLocation(), 1421 CtorArgs.takeAs<Expr>(), 1422 CtorArgs.size(), 1423 SourceLocation()); 1424 AllToInit.push_back(Member); 1425 } 1426 } 1427 } 1428 1429 // non-static data members. 1430 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1431 E = ClassDecl->field_end(); Field != E; ++Field) { 1432 if ((*Field)->isAnonymousStructOrUnion()) { 1433 if (const RecordType *FieldClassType = 1434 Field->getType()->getAs<RecordType>()) { 1435 CXXRecordDecl *FieldClassDecl 1436 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1437 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1438 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1439 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1440 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1441 // set to the anonymous union data member used in the initializer 1442 // list. 1443 Value->setMember(*Field); 1444 Value->setAnonUnionMember(*FA); 1445 AllToInit.push_back(Value); 1446 break; 1447 } 1448 } 1449 } 1450 continue; 1451 } 1452 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1453 AllToInit.push_back(Value); 1454 continue; 1455 } 1456 1457 if ((*Field)->getType()->isDependentType()) 1458 continue; 1459 1460 QualType FT = Context.getBaseElementType((*Field)->getType()); 1461 if (const RecordType* RT = FT->getAs<RecordType>()) { 1462 CXXConstructorDecl *Ctor = 1463 cast<CXXRecordDecl>(RT->getDecl())->getDefaultConstructor(Context); 1464 if (!Ctor) { 1465 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1466 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1467 << 1 << (*Field)->getDeclName(); 1468 Diag(Field->getLocation(), diag::note_field_decl); 1469 Diag(RT->getDecl()->getLocation(), diag::note_previous_decl) 1470 << Context.getTagDeclType(RT->getDecl()); 1471 HadError = true; 1472 continue; 1473 } 1474 1475 if (FT.isConstQualified() && Ctor->isTrivial()) { 1476 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1477 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1478 << 1 << (*Field)->getDeclName(); 1479 Diag((*Field)->getLocation(), diag::note_declared_at); 1480 HadError = true; 1481 } 1482 1483 // Don't create initializers for trivial constructors, since they don't 1484 // actually need to be run. 1485 if (Ctor->isTrivial()) 1486 continue; 1487 1488 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1489 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1490 Constructor->getLocation(), CtorArgs)) 1491 continue; 1492 1493 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1494 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1495 ExprTemporaries.clear(); 1496 CXXBaseOrMemberInitializer *Member = 1497 new (Context) CXXBaseOrMemberInitializer(Context, 1498 *Field, SourceLocation(), 1499 Ctor, 1500 SourceLocation(), 1501 CtorArgs.takeAs<Expr>(), 1502 CtorArgs.size(), 1503 SourceLocation()); 1504 1505 AllToInit.push_back(Member); 1506 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1507 } 1508 else if (FT->isReferenceType()) { 1509 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1510 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1511 << 0 << (*Field)->getDeclName(); 1512 Diag((*Field)->getLocation(), diag::note_declared_at); 1513 HadError = true; 1514 } 1515 else if (FT.isConstQualified()) { 1516 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1517 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1518 << 1 << (*Field)->getDeclName(); 1519 Diag((*Field)->getLocation(), diag::note_declared_at); 1520 HadError = true; 1521 } 1522 } 1523 1524 NumInitializers = AllToInit.size(); 1525 if (NumInitializers > 0) { 1526 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1527 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1528 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1529 1530 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1531 for (unsigned Idx = 0; Idx < NumInitializers; ++Idx) 1532 baseOrMemberInitializers[Idx] = AllToInit[Idx]; 1533 } 1534 1535 return HadError; 1536} 1537 1538static void *GetKeyForTopLevelField(FieldDecl *Field) { 1539 // For anonymous unions, use the class declaration as the key. 1540 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1541 if (RT->getDecl()->isAnonymousStructOrUnion()) 1542 return static_cast<void *>(RT->getDecl()); 1543 } 1544 return static_cast<void *>(Field); 1545} 1546 1547static void *GetKeyForBase(QualType BaseType) { 1548 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1549 return (void *)RT; 1550 1551 assert(0 && "Unexpected base type!"); 1552 return 0; 1553} 1554 1555static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1556 bool MemberMaybeAnon = false) { 1557 // For fields injected into the class via declaration of an anonymous union, 1558 // use its anonymous union class declaration as the unique key. 1559 if (Member->isMemberInitializer()) { 1560 FieldDecl *Field = Member->getMember(); 1561 1562 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1563 // data member of the class. Data member used in the initializer list is 1564 // in AnonUnionMember field. 1565 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1566 Field = Member->getAnonUnionMember(); 1567 if (Field->getDeclContext()->isRecord()) { 1568 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 1569 if (RD->isAnonymousStructOrUnion()) 1570 return static_cast<void *>(RD); 1571 } 1572 return static_cast<void *>(Field); 1573 } 1574 1575 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1576} 1577 1578/// ActOnMemInitializers - Handle the member initializers for a constructor. 1579void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1580 SourceLocation ColonLoc, 1581 MemInitTy **MemInits, unsigned NumMemInits) { 1582 if (!ConstructorDecl) 1583 return; 1584 1585 AdjustDeclIfTemplate(ConstructorDecl); 1586 1587 CXXConstructorDecl *Constructor 1588 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1589 1590 if (!Constructor) { 1591 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1592 return; 1593 } 1594 1595 if (!Constructor->isDependentContext()) { 1596 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 1597 bool err = false; 1598 for (unsigned i = 0; i < NumMemInits; i++) { 1599 CXXBaseOrMemberInitializer *Member = 1600 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1601 void *KeyToMember = GetKeyForMember(Member); 1602 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1603 if (!PrevMember) { 1604 PrevMember = Member; 1605 continue; 1606 } 1607 if (FieldDecl *Field = Member->getMember()) 1608 Diag(Member->getSourceLocation(), 1609 diag::error_multiple_mem_initialization) 1610 << Field->getNameAsString() 1611 << Member->getSourceRange(); 1612 else { 1613 Type *BaseClass = Member->getBaseClass(); 1614 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1615 Diag(Member->getSourceLocation(), 1616 diag::error_multiple_base_initialization) 1617 << QualType(BaseClass, 0) 1618 << Member->getSourceRange(); 1619 } 1620 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1621 << 0; 1622 err = true; 1623 } 1624 1625 if (err) 1626 return; 1627 } 1628 1629 SetBaseOrMemberInitializers(Constructor, 1630 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 1631 NumMemInits, false); 1632 1633 if (Constructor->isDependentContext()) 1634 return; 1635 1636 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1637 Diagnostic::Ignored && 1638 Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1639 Diagnostic::Ignored) 1640 return; 1641 1642 // Also issue warning if order of ctor-initializer list does not match order 1643 // of 1) base class declarations and 2) order of non-static data members. 1644 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1645 1646 CXXRecordDecl *ClassDecl 1647 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1648 // Push virtual bases before others. 1649 for (CXXRecordDecl::base_class_iterator VBase = 1650 ClassDecl->vbases_begin(), 1651 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1652 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1653 1654 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1655 E = ClassDecl->bases_end(); Base != E; ++Base) { 1656 // Virtuals are alread in the virtual base list and are constructed 1657 // first. 1658 if (Base->isVirtual()) 1659 continue; 1660 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1661 } 1662 1663 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1664 E = ClassDecl->field_end(); Field != E; ++Field) 1665 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1666 1667 int Last = AllBaseOrMembers.size(); 1668 int curIndex = 0; 1669 CXXBaseOrMemberInitializer *PrevMember = 0; 1670 for (unsigned i = 0; i < NumMemInits; i++) { 1671 CXXBaseOrMemberInitializer *Member = 1672 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1673 void *MemberInCtorList = GetKeyForMember(Member, true); 1674 1675 for (; curIndex < Last; curIndex++) 1676 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1677 break; 1678 if (curIndex == Last) { 1679 assert(PrevMember && "Member not in member list?!"); 1680 // Initializer as specified in ctor-initializer list is out of order. 1681 // Issue a warning diagnostic. 1682 if (PrevMember->isBaseInitializer()) { 1683 // Diagnostics is for an initialized base class. 1684 Type *BaseClass = PrevMember->getBaseClass(); 1685 Diag(PrevMember->getSourceLocation(), 1686 diag::warn_base_initialized) 1687 << QualType(BaseClass, 0); 1688 } else { 1689 FieldDecl *Field = PrevMember->getMember(); 1690 Diag(PrevMember->getSourceLocation(), 1691 diag::warn_field_initialized) 1692 << Field->getNameAsString(); 1693 } 1694 // Also the note! 1695 if (FieldDecl *Field = Member->getMember()) 1696 Diag(Member->getSourceLocation(), 1697 diag::note_fieldorbase_initialized_here) << 0 1698 << Field->getNameAsString(); 1699 else { 1700 Type *BaseClass = Member->getBaseClass(); 1701 Diag(Member->getSourceLocation(), 1702 diag::note_fieldorbase_initialized_here) << 1 1703 << QualType(BaseClass, 0); 1704 } 1705 for (curIndex = 0; curIndex < Last; curIndex++) 1706 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1707 break; 1708 } 1709 PrevMember = Member; 1710 } 1711} 1712 1713void 1714Sema::MarkBaseAndMemberDestructorsReferenced(CXXDestructorDecl *Destructor) { 1715 // Ignore dependent destructors. 1716 if (Destructor->isDependentContext()) 1717 return; 1718 1719 CXXRecordDecl *ClassDecl = Destructor->getParent(); 1720 1721 // Non-static data members. 1722 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1723 E = ClassDecl->field_end(); I != E; ++I) { 1724 FieldDecl *Field = *I; 1725 1726 QualType FieldType = Context.getBaseElementType(Field->getType()); 1727 1728 const RecordType* RT = FieldType->getAs<RecordType>(); 1729 if (!RT) 1730 continue; 1731 1732 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1733 if (FieldClassDecl->hasTrivialDestructor()) 1734 continue; 1735 1736 const CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1737 MarkDeclarationReferenced(Destructor->getLocation(), 1738 const_cast<CXXDestructorDecl*>(Dtor)); 1739 } 1740 1741 // Bases. 1742 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1743 E = ClassDecl->bases_end(); Base != E; ++Base) { 1744 // Ignore virtual bases. 1745 if (Base->isVirtual()) 1746 continue; 1747 1748 // Ignore trivial destructors. 1749 CXXRecordDecl *BaseClassDecl 1750 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1751 if (BaseClassDecl->hasTrivialDestructor()) 1752 continue; 1753 1754 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1755 MarkDeclarationReferenced(Destructor->getLocation(), 1756 const_cast<CXXDestructorDecl*>(Dtor)); 1757 } 1758 1759 // Virtual bases. 1760 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1761 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1762 // Ignore trivial destructors. 1763 CXXRecordDecl *BaseClassDecl 1764 = cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1765 if (BaseClassDecl->hasTrivialDestructor()) 1766 continue; 1767 1768 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1769 MarkDeclarationReferenced(Destructor->getLocation(), 1770 const_cast<CXXDestructorDecl*>(Dtor)); 1771 } 1772} 1773 1774void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1775 if (!CDtorDecl) 1776 return; 1777 1778 AdjustDeclIfTemplate(CDtorDecl); 1779 1780 if (CXXConstructorDecl *Constructor 1781 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1782 SetBaseOrMemberInitializers(Constructor, 0, 0, false); 1783} 1784 1785namespace { 1786 /// PureVirtualMethodCollector - traverses a class and its superclasses 1787 /// and determines if it has any pure virtual methods. 1788 class PureVirtualMethodCollector { 1789 ASTContext &Context; 1790 1791 public: 1792 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1793 1794 private: 1795 MethodList Methods; 1796 1797 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1798 1799 public: 1800 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1801 : Context(Ctx) { 1802 1803 MethodList List; 1804 Collect(RD, List); 1805 1806 // Copy the temporary list to methods, and make sure to ignore any 1807 // null entries. 1808 for (size_t i = 0, e = List.size(); i != e; ++i) { 1809 if (List[i]) 1810 Methods.push_back(List[i]); 1811 } 1812 } 1813 1814 bool empty() const { return Methods.empty(); } 1815 1816 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1817 MethodList::const_iterator methods_end() { return Methods.end(); } 1818 }; 1819 1820 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1821 MethodList& Methods) { 1822 // First, collect the pure virtual methods for the base classes. 1823 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1824 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1825 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1826 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1827 if (BaseDecl && BaseDecl->isAbstract()) 1828 Collect(BaseDecl, Methods); 1829 } 1830 } 1831 1832 // Next, zero out any pure virtual methods that this class overrides. 1833 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1834 1835 MethodSetTy OverriddenMethods; 1836 size_t MethodsSize = Methods.size(); 1837 1838 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1839 i != e; ++i) { 1840 // Traverse the record, looking for methods. 1841 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1842 // If the method is pure virtual, add it to the methods vector. 1843 if (MD->isPure()) 1844 Methods.push_back(MD); 1845 1846 // Record all the overridden methods in our set. 1847 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1848 E = MD->end_overridden_methods(); I != E; ++I) { 1849 // Keep track of the overridden methods. 1850 OverriddenMethods.insert(*I); 1851 } 1852 } 1853 } 1854 1855 // Now go through the methods and zero out all the ones we know are 1856 // overridden. 1857 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1858 if (OverriddenMethods.count(Methods[i])) 1859 Methods[i] = 0; 1860 } 1861 1862 } 1863} 1864 1865 1866bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1867 unsigned DiagID, AbstractDiagSelID SelID, 1868 const CXXRecordDecl *CurrentRD) { 1869 if (SelID == -1) 1870 return RequireNonAbstractType(Loc, T, 1871 PDiag(DiagID), CurrentRD); 1872 else 1873 return RequireNonAbstractType(Loc, T, 1874 PDiag(DiagID) << SelID, CurrentRD); 1875} 1876 1877bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1878 const PartialDiagnostic &PD, 1879 const CXXRecordDecl *CurrentRD) { 1880 if (!getLangOptions().CPlusPlus) 1881 return false; 1882 1883 if (const ArrayType *AT = Context.getAsArrayType(T)) 1884 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 1885 CurrentRD); 1886 1887 if (const PointerType *PT = T->getAs<PointerType>()) { 1888 // Find the innermost pointer type. 1889 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1890 PT = T; 1891 1892 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1893 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 1894 } 1895 1896 const RecordType *RT = T->getAs<RecordType>(); 1897 if (!RT) 1898 return false; 1899 1900 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1901 if (!RD) 1902 return false; 1903 1904 if (CurrentRD && CurrentRD != RD) 1905 return false; 1906 1907 if (!RD->isAbstract()) 1908 return false; 1909 1910 Diag(Loc, PD) << RD->getDeclName(); 1911 1912 // Check if we've already emitted the list of pure virtual functions for this 1913 // class. 1914 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1915 return true; 1916 1917 PureVirtualMethodCollector Collector(Context, RD); 1918 1919 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1920 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1921 const CXXMethodDecl *MD = *I; 1922 1923 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1924 MD->getDeclName(); 1925 } 1926 1927 if (!PureVirtualClassDiagSet) 1928 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1929 PureVirtualClassDiagSet->insert(RD); 1930 1931 return true; 1932} 1933 1934namespace { 1935 class AbstractClassUsageDiagnoser 1936 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1937 Sema &SemaRef; 1938 CXXRecordDecl *AbstractClass; 1939 1940 bool VisitDeclContext(const DeclContext *DC) { 1941 bool Invalid = false; 1942 1943 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1944 E = DC->decls_end(); I != E; ++I) 1945 Invalid |= Visit(*I); 1946 1947 return Invalid; 1948 } 1949 1950 public: 1951 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1952 : SemaRef(SemaRef), AbstractClass(ac) { 1953 Visit(SemaRef.Context.getTranslationUnitDecl()); 1954 } 1955 1956 bool VisitFunctionDecl(const FunctionDecl *FD) { 1957 if (FD->isThisDeclarationADefinition()) { 1958 // No need to do the check if we're in a definition, because it requires 1959 // that the return/param types are complete. 1960 // because that requires 1961 return VisitDeclContext(FD); 1962 } 1963 1964 // Check the return type. 1965 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 1966 bool Invalid = 1967 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1968 diag::err_abstract_type_in_decl, 1969 Sema::AbstractReturnType, 1970 AbstractClass); 1971 1972 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1973 E = FD->param_end(); I != E; ++I) { 1974 const ParmVarDecl *VD = *I; 1975 Invalid |= 1976 SemaRef.RequireNonAbstractType(VD->getLocation(), 1977 VD->getOriginalType(), 1978 diag::err_abstract_type_in_decl, 1979 Sema::AbstractParamType, 1980 AbstractClass); 1981 } 1982 1983 return Invalid; 1984 } 1985 1986 bool VisitDecl(const Decl* D) { 1987 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1988 return VisitDeclContext(DC); 1989 1990 return false; 1991 } 1992 }; 1993} 1994 1995/// \brief Perform semantic checks on a class definition that has been 1996/// completing, introducing implicitly-declared members, checking for 1997/// abstract types, etc. 1998void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 1999 if (!Record || Record->isInvalidDecl()) 2000 return; 2001 2002 if (!Record->isDependentType()) 2003 AddImplicitlyDeclaredMembersToClass(Record); 2004 2005 if (Record->isInvalidDecl()) 2006 return; 2007 2008 if (!Record->isAbstract()) { 2009 // Collect all the pure virtual methods and see if this is an abstract 2010 // class after all. 2011 PureVirtualMethodCollector Collector(Context, Record); 2012 if (!Collector.empty()) 2013 Record->setAbstract(true); 2014 } 2015 2016 if (Record->isAbstract()) 2017 (void)AbstractClassUsageDiagnoser(*this, Record); 2018} 2019 2020void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2021 DeclPtrTy TagDecl, 2022 SourceLocation LBrac, 2023 SourceLocation RBrac) { 2024 if (!TagDecl) 2025 return; 2026 2027 AdjustDeclIfTemplate(TagDecl); 2028 2029 ActOnFields(S, RLoc, TagDecl, 2030 (DeclPtrTy*)FieldCollector->getCurFields(), 2031 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 2032 2033 CheckCompletedCXXClass( 2034 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2035} 2036 2037/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2038/// special functions, such as the default constructor, copy 2039/// constructor, or destructor, to the given C++ class (C++ 2040/// [special]p1). This routine can only be executed just before the 2041/// definition of the class is complete. 2042void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2043 CanQualType ClassType 2044 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2045 2046 // FIXME: Implicit declarations have exception specifications, which are 2047 // the union of the specifications of the implicitly called functions. 2048 2049 if (!ClassDecl->hasUserDeclaredConstructor()) { 2050 // C++ [class.ctor]p5: 2051 // A default constructor for a class X is a constructor of class X 2052 // that can be called without an argument. If there is no 2053 // user-declared constructor for class X, a default constructor is 2054 // implicitly declared. An implicitly-declared default constructor 2055 // is an inline public member of its class. 2056 DeclarationName Name 2057 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2058 CXXConstructorDecl *DefaultCon = 2059 CXXConstructorDecl::Create(Context, ClassDecl, 2060 ClassDecl->getLocation(), Name, 2061 Context.getFunctionType(Context.VoidTy, 2062 0, 0, false, 0), 2063 /*TInfo=*/0, 2064 /*isExplicit=*/false, 2065 /*isInline=*/true, 2066 /*isImplicitlyDeclared=*/true); 2067 DefaultCon->setAccess(AS_public); 2068 DefaultCon->setImplicit(); 2069 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2070 ClassDecl->addDecl(DefaultCon); 2071 } 2072 2073 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2074 // C++ [class.copy]p4: 2075 // If the class definition does not explicitly declare a copy 2076 // constructor, one is declared implicitly. 2077 2078 // C++ [class.copy]p5: 2079 // The implicitly-declared copy constructor for a class X will 2080 // have the form 2081 // 2082 // X::X(const X&) 2083 // 2084 // if 2085 bool HasConstCopyConstructor = true; 2086 2087 // -- each direct or virtual base class B of X has a copy 2088 // constructor whose first parameter is of type const B& or 2089 // const volatile B&, and 2090 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2091 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2092 const CXXRecordDecl *BaseClassDecl 2093 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2094 HasConstCopyConstructor 2095 = BaseClassDecl->hasConstCopyConstructor(Context); 2096 } 2097 2098 // -- for all the nonstatic data members of X that are of a 2099 // class type M (or array thereof), each such class type 2100 // has a copy constructor whose first parameter is of type 2101 // const M& or const volatile M&. 2102 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2103 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2104 ++Field) { 2105 QualType FieldType = (*Field)->getType(); 2106 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2107 FieldType = Array->getElementType(); 2108 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2109 const CXXRecordDecl *FieldClassDecl 2110 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2111 HasConstCopyConstructor 2112 = FieldClassDecl->hasConstCopyConstructor(Context); 2113 } 2114 } 2115 2116 // Otherwise, the implicitly declared copy constructor will have 2117 // the form 2118 // 2119 // X::X(X&) 2120 QualType ArgType = ClassType; 2121 if (HasConstCopyConstructor) 2122 ArgType = ArgType.withConst(); 2123 ArgType = Context.getLValueReferenceType(ArgType); 2124 2125 // An implicitly-declared copy constructor is an inline public 2126 // member of its class. 2127 DeclarationName Name 2128 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2129 CXXConstructorDecl *CopyConstructor 2130 = CXXConstructorDecl::Create(Context, ClassDecl, 2131 ClassDecl->getLocation(), Name, 2132 Context.getFunctionType(Context.VoidTy, 2133 &ArgType, 1, 2134 false, 0), 2135 /*TInfo=*/0, 2136 /*isExplicit=*/false, 2137 /*isInline=*/true, 2138 /*isImplicitlyDeclared=*/true); 2139 CopyConstructor->setAccess(AS_public); 2140 CopyConstructor->setImplicit(); 2141 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2142 2143 // Add the parameter to the constructor. 2144 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2145 ClassDecl->getLocation(), 2146 /*IdentifierInfo=*/0, 2147 ArgType, /*TInfo=*/0, 2148 VarDecl::None, 0); 2149 CopyConstructor->setParams(Context, &FromParam, 1); 2150 ClassDecl->addDecl(CopyConstructor); 2151 } 2152 2153 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2154 // Note: The following rules are largely analoguous to the copy 2155 // constructor rules. Note that virtual bases are not taken into account 2156 // for determining the argument type of the operator. Note also that 2157 // operators taking an object instead of a reference are allowed. 2158 // 2159 // C++ [class.copy]p10: 2160 // If the class definition does not explicitly declare a copy 2161 // assignment operator, one is declared implicitly. 2162 // The implicitly-defined copy assignment operator for a class X 2163 // will have the form 2164 // 2165 // X& X::operator=(const X&) 2166 // 2167 // if 2168 bool HasConstCopyAssignment = true; 2169 2170 // -- each direct base class B of X has a copy assignment operator 2171 // whose parameter is of type const B&, const volatile B& or B, 2172 // and 2173 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2174 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2175 assert(!Base->getType()->isDependentType() && 2176 "Cannot generate implicit members for class with dependent bases."); 2177 const CXXRecordDecl *BaseClassDecl 2178 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2179 const CXXMethodDecl *MD = 0; 2180 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2181 MD); 2182 } 2183 2184 // -- for all the nonstatic data members of X that are of a class 2185 // type M (or array thereof), each such class type has a copy 2186 // assignment operator whose parameter is of type const M&, 2187 // const volatile M& or M. 2188 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2189 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2190 ++Field) { 2191 QualType FieldType = (*Field)->getType(); 2192 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2193 FieldType = Array->getElementType(); 2194 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2195 const CXXRecordDecl *FieldClassDecl 2196 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2197 const CXXMethodDecl *MD = 0; 2198 HasConstCopyAssignment 2199 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2200 } 2201 } 2202 2203 // Otherwise, the implicitly declared copy assignment operator will 2204 // have the form 2205 // 2206 // X& X::operator=(X&) 2207 QualType ArgType = ClassType; 2208 QualType RetType = Context.getLValueReferenceType(ArgType); 2209 if (HasConstCopyAssignment) 2210 ArgType = ArgType.withConst(); 2211 ArgType = Context.getLValueReferenceType(ArgType); 2212 2213 // An implicitly-declared copy assignment operator is an inline public 2214 // member of its class. 2215 DeclarationName Name = 2216 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2217 CXXMethodDecl *CopyAssignment = 2218 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2219 Context.getFunctionType(RetType, &ArgType, 1, 2220 false, 0), 2221 /*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2222 CopyAssignment->setAccess(AS_public); 2223 CopyAssignment->setImplicit(); 2224 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2225 CopyAssignment->setCopyAssignment(true); 2226 2227 // Add the parameter to the operator. 2228 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2229 ClassDecl->getLocation(), 2230 /*IdentifierInfo=*/0, 2231 ArgType, /*TInfo=*/0, 2232 VarDecl::None, 0); 2233 CopyAssignment->setParams(Context, &FromParam, 1); 2234 2235 // Don't call addedAssignmentOperator. There is no way to distinguish an 2236 // implicit from an explicit assignment operator. 2237 ClassDecl->addDecl(CopyAssignment); 2238 AddOverriddenMethods(ClassDecl, CopyAssignment); 2239 } 2240 2241 if (!ClassDecl->hasUserDeclaredDestructor()) { 2242 // C++ [class.dtor]p2: 2243 // If a class has no user-declared destructor, a destructor is 2244 // declared implicitly. An implicitly-declared destructor is an 2245 // inline public member of its class. 2246 DeclarationName Name 2247 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2248 CXXDestructorDecl *Destructor 2249 = CXXDestructorDecl::Create(Context, ClassDecl, 2250 ClassDecl->getLocation(), Name, 2251 Context.getFunctionType(Context.VoidTy, 2252 0, 0, false, 0), 2253 /*isInline=*/true, 2254 /*isImplicitlyDeclared=*/true); 2255 Destructor->setAccess(AS_public); 2256 Destructor->setImplicit(); 2257 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2258 ClassDecl->addDecl(Destructor); 2259 2260 AddOverriddenMethods(ClassDecl, Destructor); 2261 } 2262} 2263 2264void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2265 Decl *D = TemplateD.getAs<Decl>(); 2266 if (!D) 2267 return; 2268 2269 TemplateParameterList *Params = 0; 2270 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2271 Params = Template->getTemplateParameters(); 2272 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2273 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2274 Params = PartialSpec->getTemplateParameters(); 2275 else 2276 return; 2277 2278 for (TemplateParameterList::iterator Param = Params->begin(), 2279 ParamEnd = Params->end(); 2280 Param != ParamEnd; ++Param) { 2281 NamedDecl *Named = cast<NamedDecl>(*Param); 2282 if (Named->getDeclName()) { 2283 S->AddDecl(DeclPtrTy::make(Named)); 2284 IdResolver.AddDecl(Named); 2285 } 2286 } 2287} 2288 2289void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2290 if (!RecordD) return; 2291 AdjustDeclIfTemplate(RecordD); 2292 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2293 PushDeclContext(S, Record); 2294} 2295 2296void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2297 if (!RecordD) return; 2298 PopDeclContext(); 2299} 2300 2301/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2302/// parsing a top-level (non-nested) C++ class, and we are now 2303/// parsing those parts of the given Method declaration that could 2304/// not be parsed earlier (C++ [class.mem]p2), such as default 2305/// arguments. This action should enter the scope of the given 2306/// Method declaration as if we had just parsed the qualified method 2307/// name. However, it should not bring the parameters into scope; 2308/// that will be performed by ActOnDelayedCXXMethodParameter. 2309void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2310} 2311 2312/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2313/// C++ method declaration. We're (re-)introducing the given 2314/// function parameter into scope for use in parsing later parts of 2315/// the method declaration. For example, we could see an 2316/// ActOnParamDefaultArgument event for this parameter. 2317void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2318 if (!ParamD) 2319 return; 2320 2321 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2322 2323 // If this parameter has an unparsed default argument, clear it out 2324 // to make way for the parsed default argument. 2325 if (Param->hasUnparsedDefaultArg()) 2326 Param->setDefaultArg(0); 2327 2328 S->AddDecl(DeclPtrTy::make(Param)); 2329 if (Param->getDeclName()) 2330 IdResolver.AddDecl(Param); 2331} 2332 2333/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2334/// processing the delayed method declaration for Method. The method 2335/// declaration is now considered finished. There may be a separate 2336/// ActOnStartOfFunctionDef action later (not necessarily 2337/// immediately!) for this method, if it was also defined inside the 2338/// class body. 2339void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2340 if (!MethodD) 2341 return; 2342 2343 AdjustDeclIfTemplate(MethodD); 2344 2345 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2346 2347 // Now that we have our default arguments, check the constructor 2348 // again. It could produce additional diagnostics or affect whether 2349 // the class has implicitly-declared destructors, among other 2350 // things. 2351 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2352 CheckConstructor(Constructor); 2353 2354 // Check the default arguments, which we may have added. 2355 if (!Method->isInvalidDecl()) 2356 CheckCXXDefaultArguments(Method); 2357} 2358 2359/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2360/// the well-formedness of the constructor declarator @p D with type @p 2361/// R. If there are any errors in the declarator, this routine will 2362/// emit diagnostics and set the invalid bit to true. In any case, the type 2363/// will be updated to reflect a well-formed type for the constructor and 2364/// returned. 2365QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2366 FunctionDecl::StorageClass &SC) { 2367 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2368 2369 // C++ [class.ctor]p3: 2370 // A constructor shall not be virtual (10.3) or static (9.4). A 2371 // constructor can be invoked for a const, volatile or const 2372 // volatile object. A constructor shall not be declared const, 2373 // volatile, or const volatile (9.3.2). 2374 if (isVirtual) { 2375 if (!D.isInvalidType()) 2376 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2377 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2378 << SourceRange(D.getIdentifierLoc()); 2379 D.setInvalidType(); 2380 } 2381 if (SC == FunctionDecl::Static) { 2382 if (!D.isInvalidType()) 2383 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2384 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2385 << SourceRange(D.getIdentifierLoc()); 2386 D.setInvalidType(); 2387 SC = FunctionDecl::None; 2388 } 2389 2390 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2391 if (FTI.TypeQuals != 0) { 2392 if (FTI.TypeQuals & Qualifiers::Const) 2393 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2394 << "const" << SourceRange(D.getIdentifierLoc()); 2395 if (FTI.TypeQuals & Qualifiers::Volatile) 2396 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2397 << "volatile" << SourceRange(D.getIdentifierLoc()); 2398 if (FTI.TypeQuals & Qualifiers::Restrict) 2399 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2400 << "restrict" << SourceRange(D.getIdentifierLoc()); 2401 } 2402 2403 // Rebuild the function type "R" without any type qualifiers (in 2404 // case any of the errors above fired) and with "void" as the 2405 // return type, since constructors don't have return types. We 2406 // *always* have to do this, because GetTypeForDeclarator will 2407 // put in a result type of "int" when none was specified. 2408 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2409 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2410 Proto->getNumArgs(), 2411 Proto->isVariadic(), 0); 2412} 2413 2414/// CheckConstructor - Checks a fully-formed constructor for 2415/// well-formedness, issuing any diagnostics required. Returns true if 2416/// the constructor declarator is invalid. 2417void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2418 CXXRecordDecl *ClassDecl 2419 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2420 if (!ClassDecl) 2421 return Constructor->setInvalidDecl(); 2422 2423 // C++ [class.copy]p3: 2424 // A declaration of a constructor for a class X is ill-formed if 2425 // its first parameter is of type (optionally cv-qualified) X and 2426 // either there are no other parameters or else all other 2427 // parameters have default arguments. 2428 if (!Constructor->isInvalidDecl() && 2429 ((Constructor->getNumParams() == 1) || 2430 (Constructor->getNumParams() > 1 && 2431 Constructor->getParamDecl(1)->hasDefaultArg())) && 2432 Constructor->getTemplateSpecializationKind() 2433 != TSK_ImplicitInstantiation) { 2434 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2435 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2436 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2437 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2438 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2439 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 2440 2441 // FIXME: Rather that making the constructor invalid, we should endeavor 2442 // to fix the type. 2443 Constructor->setInvalidDecl(); 2444 } 2445 } 2446 2447 // Notify the class that we've added a constructor. 2448 ClassDecl->addedConstructor(Context, Constructor); 2449} 2450 2451/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2452/// issuing any diagnostics required. Returns true on error. 2453bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2454 CXXRecordDecl *RD = Destructor->getParent(); 2455 2456 if (Destructor->isVirtual()) { 2457 SourceLocation Loc; 2458 2459 if (!Destructor->isImplicit()) 2460 Loc = Destructor->getLocation(); 2461 else 2462 Loc = RD->getLocation(); 2463 2464 // If we have a virtual destructor, look up the deallocation function 2465 FunctionDecl *OperatorDelete = 0; 2466 DeclarationName Name = 2467 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2468 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2469 return true; 2470 2471 Destructor->setOperatorDelete(OperatorDelete); 2472 } 2473 2474 return false; 2475} 2476 2477static inline bool 2478FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2479 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2480 FTI.ArgInfo[0].Param && 2481 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2482} 2483 2484/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2485/// the well-formednes of the destructor declarator @p D with type @p 2486/// R. If there are any errors in the declarator, this routine will 2487/// emit diagnostics and set the declarator to invalid. Even if this happens, 2488/// will be updated to reflect a well-formed type for the destructor and 2489/// returned. 2490QualType Sema::CheckDestructorDeclarator(Declarator &D, 2491 FunctionDecl::StorageClass& SC) { 2492 // C++ [class.dtor]p1: 2493 // [...] A typedef-name that names a class is a class-name 2494 // (7.1.3); however, a typedef-name that names a class shall not 2495 // be used as the identifier in the declarator for a destructor 2496 // declaration. 2497 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2498 if (isa<TypedefType>(DeclaratorType)) { 2499 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2500 << DeclaratorType; 2501 D.setInvalidType(); 2502 } 2503 2504 // C++ [class.dtor]p2: 2505 // A destructor is used to destroy objects of its class type. A 2506 // destructor takes no parameters, and no return type can be 2507 // specified for it (not even void). The address of a destructor 2508 // shall not be taken. A destructor shall not be static. A 2509 // destructor can be invoked for a const, volatile or const 2510 // volatile object. A destructor shall not be declared const, 2511 // volatile or const volatile (9.3.2). 2512 if (SC == FunctionDecl::Static) { 2513 if (!D.isInvalidType()) 2514 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2515 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2516 << SourceRange(D.getIdentifierLoc()); 2517 SC = FunctionDecl::None; 2518 D.setInvalidType(); 2519 } 2520 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2521 // Destructors don't have return types, but the parser will 2522 // happily parse something like: 2523 // 2524 // class X { 2525 // float ~X(); 2526 // }; 2527 // 2528 // The return type will be eliminated later. 2529 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2530 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2531 << SourceRange(D.getIdentifierLoc()); 2532 } 2533 2534 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2535 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2536 if (FTI.TypeQuals & Qualifiers::Const) 2537 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2538 << "const" << SourceRange(D.getIdentifierLoc()); 2539 if (FTI.TypeQuals & Qualifiers::Volatile) 2540 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2541 << "volatile" << SourceRange(D.getIdentifierLoc()); 2542 if (FTI.TypeQuals & Qualifiers::Restrict) 2543 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2544 << "restrict" << SourceRange(D.getIdentifierLoc()); 2545 D.setInvalidType(); 2546 } 2547 2548 // Make sure we don't have any parameters. 2549 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2550 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2551 2552 // Delete the parameters. 2553 FTI.freeArgs(); 2554 D.setInvalidType(); 2555 } 2556 2557 // Make sure the destructor isn't variadic. 2558 if (FTI.isVariadic) { 2559 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2560 D.setInvalidType(); 2561 } 2562 2563 // Rebuild the function type "R" without any type qualifiers or 2564 // parameters (in case any of the errors above fired) and with 2565 // "void" as the return type, since destructors don't have return 2566 // types. We *always* have to do this, because GetTypeForDeclarator 2567 // will put in a result type of "int" when none was specified. 2568 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 2569} 2570 2571/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2572/// well-formednes of the conversion function declarator @p D with 2573/// type @p R. If there are any errors in the declarator, this routine 2574/// will emit diagnostics and return true. Otherwise, it will return 2575/// false. Either way, the type @p R will be updated to reflect a 2576/// well-formed type for the conversion operator. 2577void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2578 FunctionDecl::StorageClass& SC) { 2579 // C++ [class.conv.fct]p1: 2580 // Neither parameter types nor return type can be specified. The 2581 // type of a conversion function (8.3.5) is "function taking no 2582 // parameter returning conversion-type-id." 2583 if (SC == FunctionDecl::Static) { 2584 if (!D.isInvalidType()) 2585 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2586 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2587 << SourceRange(D.getIdentifierLoc()); 2588 D.setInvalidType(); 2589 SC = FunctionDecl::None; 2590 } 2591 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2592 // Conversion functions don't have return types, but the parser will 2593 // happily parse something like: 2594 // 2595 // class X { 2596 // float operator bool(); 2597 // }; 2598 // 2599 // The return type will be changed later anyway. 2600 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2601 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2602 << SourceRange(D.getIdentifierLoc()); 2603 } 2604 2605 // Make sure we don't have any parameters. 2606 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2607 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2608 2609 // Delete the parameters. 2610 D.getTypeObject(0).Fun.freeArgs(); 2611 D.setInvalidType(); 2612 } 2613 2614 // Make sure the conversion function isn't variadic. 2615 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2616 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2617 D.setInvalidType(); 2618 } 2619 2620 // C++ [class.conv.fct]p4: 2621 // The conversion-type-id shall not represent a function type nor 2622 // an array type. 2623 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2624 if (ConvType->isArrayType()) { 2625 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2626 ConvType = Context.getPointerType(ConvType); 2627 D.setInvalidType(); 2628 } else if (ConvType->isFunctionType()) { 2629 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2630 ConvType = Context.getPointerType(ConvType); 2631 D.setInvalidType(); 2632 } 2633 2634 // Rebuild the function type "R" without any parameters (in case any 2635 // of the errors above fired) and with the conversion type as the 2636 // return type. 2637 R = Context.getFunctionType(ConvType, 0, 0, false, 2638 R->getAs<FunctionProtoType>()->getTypeQuals()); 2639 2640 // C++0x explicit conversion operators. 2641 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2642 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2643 diag::warn_explicit_conversion_functions) 2644 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2645} 2646 2647/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2648/// the declaration of the given C++ conversion function. This routine 2649/// is responsible for recording the conversion function in the C++ 2650/// class, if possible. 2651Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2652 assert(Conversion && "Expected to receive a conversion function declaration"); 2653 2654 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2655 2656 // Make sure we aren't redeclaring the conversion function. 2657 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2658 2659 // C++ [class.conv.fct]p1: 2660 // [...] A conversion function is never used to convert a 2661 // (possibly cv-qualified) object to the (possibly cv-qualified) 2662 // same object type (or a reference to it), to a (possibly 2663 // cv-qualified) base class of that type (or a reference to it), 2664 // or to (possibly cv-qualified) void. 2665 // FIXME: Suppress this warning if the conversion function ends up being a 2666 // virtual function that overrides a virtual function in a base class. 2667 QualType ClassType 2668 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2669 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2670 ConvType = ConvTypeRef->getPointeeType(); 2671 if (ConvType->isRecordType()) { 2672 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2673 if (ConvType == ClassType) 2674 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2675 << ClassType; 2676 else if (IsDerivedFrom(ClassType, ConvType)) 2677 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2678 << ClassType << ConvType; 2679 } else if (ConvType->isVoidType()) { 2680 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2681 << ClassType << ConvType; 2682 } 2683 2684 if (Conversion->getPreviousDeclaration()) { 2685 const NamedDecl *ExpectedPrevDecl = Conversion->getPreviousDeclaration(); 2686 if (FunctionTemplateDecl *ConversionTemplate 2687 = Conversion->getDescribedFunctionTemplate()) 2688 ExpectedPrevDecl = ConversionTemplate->getPreviousDeclaration(); 2689 if (ClassDecl->replaceConversion(ExpectedPrevDecl, Conversion)) 2690 return DeclPtrTy::make(Conversion); 2691 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2692 } else if (FunctionTemplateDecl *ConversionTemplate 2693 = Conversion->getDescribedFunctionTemplate()) 2694 ClassDecl->addConversionFunction(ConversionTemplate); 2695 else if (!Conversion->getPrimaryTemplate()) // ignore specializations 2696 ClassDecl->addConversionFunction(Conversion); 2697 2698 return DeclPtrTy::make(Conversion); 2699} 2700 2701//===----------------------------------------------------------------------===// 2702// Namespace Handling 2703//===----------------------------------------------------------------------===// 2704 2705/// ActOnStartNamespaceDef - This is called at the start of a namespace 2706/// definition. 2707Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2708 SourceLocation IdentLoc, 2709 IdentifierInfo *II, 2710 SourceLocation LBrace) { 2711 NamespaceDecl *Namespc = 2712 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2713 Namespc->setLBracLoc(LBrace); 2714 2715 Scope *DeclRegionScope = NamespcScope->getParent(); 2716 2717 if (II) { 2718 // C++ [namespace.def]p2: 2719 // The identifier in an original-namespace-definition shall not have been 2720 // previously defined in the declarative region in which the 2721 // original-namespace-definition appears. The identifier in an 2722 // original-namespace-definition is the name of the namespace. Subsequently 2723 // in that declarative region, it is treated as an original-namespace-name. 2724 2725 NamedDecl *PrevDecl 2726 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2727 ForRedeclaration); 2728 2729 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2730 // This is an extended namespace definition. 2731 // Attach this namespace decl to the chain of extended namespace 2732 // definitions. 2733 OrigNS->setNextNamespace(Namespc); 2734 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2735 2736 // Remove the previous declaration from the scope. 2737 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2738 IdResolver.RemoveDecl(OrigNS); 2739 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2740 } 2741 } else if (PrevDecl) { 2742 // This is an invalid name redefinition. 2743 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2744 << Namespc->getDeclName(); 2745 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2746 Namespc->setInvalidDecl(); 2747 // Continue on to push Namespc as current DeclContext and return it. 2748 } else if (II->isStr("std") && 2749 CurContext->getLookupContext()->isTranslationUnit()) { 2750 // This is the first "real" definition of the namespace "std", so update 2751 // our cache of the "std" namespace to point at this definition. 2752 if (StdNamespace) { 2753 // We had already defined a dummy namespace "std". Link this new 2754 // namespace definition to the dummy namespace "std". 2755 StdNamespace->setNextNamespace(Namespc); 2756 StdNamespace->setLocation(IdentLoc); 2757 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2758 } 2759 2760 // Make our StdNamespace cache point at the first real definition of the 2761 // "std" namespace. 2762 StdNamespace = Namespc; 2763 } 2764 2765 PushOnScopeChains(Namespc, DeclRegionScope); 2766 } else { 2767 // Anonymous namespaces. 2768 assert(Namespc->isAnonymousNamespace()); 2769 CurContext->addDecl(Namespc); 2770 2771 // Link the anonymous namespace into its parent. 2772 NamespaceDecl *PrevDecl; 2773 DeclContext *Parent = CurContext->getLookupContext(); 2774 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 2775 PrevDecl = TU->getAnonymousNamespace(); 2776 TU->setAnonymousNamespace(Namespc); 2777 } else { 2778 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 2779 PrevDecl = ND->getAnonymousNamespace(); 2780 ND->setAnonymousNamespace(Namespc); 2781 } 2782 2783 // Link the anonymous namespace with its previous declaration. 2784 if (PrevDecl) { 2785 assert(PrevDecl->isAnonymousNamespace()); 2786 assert(!PrevDecl->getNextNamespace()); 2787 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 2788 PrevDecl->setNextNamespace(Namespc); 2789 } 2790 2791 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2792 // behaves as if it were replaced by 2793 // namespace unique { /* empty body */ } 2794 // using namespace unique; 2795 // namespace unique { namespace-body } 2796 // where all occurrences of 'unique' in a translation unit are 2797 // replaced by the same identifier and this identifier differs 2798 // from all other identifiers in the entire program. 2799 2800 // We just create the namespace with an empty name and then add an 2801 // implicit using declaration, just like the standard suggests. 2802 // 2803 // CodeGen enforces the "universally unique" aspect by giving all 2804 // declarations semantically contained within an anonymous 2805 // namespace internal linkage. 2806 2807 if (!PrevDecl) { 2808 UsingDirectiveDecl* UD 2809 = UsingDirectiveDecl::Create(Context, CurContext, 2810 /* 'using' */ LBrace, 2811 /* 'namespace' */ SourceLocation(), 2812 /* qualifier */ SourceRange(), 2813 /* NNS */ NULL, 2814 /* identifier */ SourceLocation(), 2815 Namespc, 2816 /* Ancestor */ CurContext); 2817 UD->setImplicit(); 2818 CurContext->addDecl(UD); 2819 } 2820 } 2821 2822 // Although we could have an invalid decl (i.e. the namespace name is a 2823 // redefinition), push it as current DeclContext and try to continue parsing. 2824 // FIXME: We should be able to push Namespc here, so that the each DeclContext 2825 // for the namespace has the declarations that showed up in that particular 2826 // namespace definition. 2827 PushDeclContext(NamespcScope, Namespc); 2828 return DeclPtrTy::make(Namespc); 2829} 2830 2831/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2832/// is a namespace alias, returns the namespace it points to. 2833static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2834 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2835 return AD->getNamespace(); 2836 return dyn_cast_or_null<NamespaceDecl>(D); 2837} 2838 2839/// ActOnFinishNamespaceDef - This callback is called after a namespace is 2840/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 2841void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 2842 Decl *Dcl = D.getAs<Decl>(); 2843 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 2844 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 2845 Namespc->setRBracLoc(RBrace); 2846 PopDeclContext(); 2847} 2848 2849Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 2850 SourceLocation UsingLoc, 2851 SourceLocation NamespcLoc, 2852 const CXXScopeSpec &SS, 2853 SourceLocation IdentLoc, 2854 IdentifierInfo *NamespcName, 2855 AttributeList *AttrList) { 2856 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2857 assert(NamespcName && "Invalid NamespcName."); 2858 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 2859 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2860 2861 UsingDirectiveDecl *UDir = 0; 2862 2863 // Lookup namespace name. 2864 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 2865 LookupParsedName(R, S, &SS); 2866 if (R.isAmbiguous()) 2867 return DeclPtrTy(); 2868 2869 if (!R.empty()) { 2870 NamedDecl *Named = R.getFoundDecl(); 2871 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 2872 && "expected namespace decl"); 2873 // C++ [namespace.udir]p1: 2874 // A using-directive specifies that the names in the nominated 2875 // namespace can be used in the scope in which the 2876 // using-directive appears after the using-directive. During 2877 // unqualified name lookup (3.4.1), the names appear as if they 2878 // were declared in the nearest enclosing namespace which 2879 // contains both the using-directive and the nominated 2880 // namespace. [Note: in this context, "contains" means "contains 2881 // directly or indirectly". ] 2882 2883 // Find enclosing context containing both using-directive and 2884 // nominated namespace. 2885 NamespaceDecl *NS = getNamespaceDecl(Named); 2886 DeclContext *CommonAncestor = cast<DeclContext>(NS); 2887 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 2888 CommonAncestor = CommonAncestor->getParent(); 2889 2890 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 2891 SS.getRange(), 2892 (NestedNameSpecifier *)SS.getScopeRep(), 2893 IdentLoc, Named, CommonAncestor); 2894 PushUsingDirective(S, UDir); 2895 } else { 2896 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 2897 } 2898 2899 // FIXME: We ignore attributes for now. 2900 delete AttrList; 2901 return DeclPtrTy::make(UDir); 2902} 2903 2904void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2905 // If scope has associated entity, then using directive is at namespace 2906 // or translation unit scope. We add UsingDirectiveDecls, into 2907 // it's lookup structure. 2908 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2909 Ctx->addDecl(UDir); 2910 else 2911 // Otherwise it is block-sope. using-directives will affect lookup 2912 // only to the end of scope. 2913 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2914} 2915 2916 2917Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2918 AccessSpecifier AS, 2919 bool HasUsingKeyword, 2920 SourceLocation UsingLoc, 2921 const CXXScopeSpec &SS, 2922 UnqualifiedId &Name, 2923 AttributeList *AttrList, 2924 bool IsTypeName, 2925 SourceLocation TypenameLoc) { 2926 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2927 2928 switch (Name.getKind()) { 2929 case UnqualifiedId::IK_Identifier: 2930 case UnqualifiedId::IK_OperatorFunctionId: 2931 case UnqualifiedId::IK_LiteralOperatorId: 2932 case UnqualifiedId::IK_ConversionFunctionId: 2933 break; 2934 2935 case UnqualifiedId::IK_ConstructorName: 2936 // C++0x inherited constructors. 2937 if (getLangOptions().CPlusPlus0x) break; 2938 2939 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 2940 << SS.getRange(); 2941 return DeclPtrTy(); 2942 2943 case UnqualifiedId::IK_DestructorName: 2944 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 2945 << SS.getRange(); 2946 return DeclPtrTy(); 2947 2948 case UnqualifiedId::IK_TemplateId: 2949 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 2950 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 2951 return DeclPtrTy(); 2952 } 2953 2954 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 2955 if (!TargetName) 2956 return DeclPtrTy(); 2957 2958 // Warn about using declarations. 2959 // TODO: store that the declaration was written without 'using' and 2960 // talk about access decls instead of using decls in the 2961 // diagnostics. 2962 if (!HasUsingKeyword) { 2963 UsingLoc = Name.getSourceRange().getBegin(); 2964 2965 Diag(UsingLoc, diag::warn_access_decl_deprecated) 2966 << CodeModificationHint::CreateInsertion(SS.getRange().getBegin(), 2967 "using "); 2968 } 2969 2970 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 2971 Name.getSourceRange().getBegin(), 2972 TargetName, AttrList, 2973 /* IsInstantiation */ false, 2974 IsTypeName, TypenameLoc); 2975 if (UD) 2976 PushOnScopeChains(UD, S, /*AddToContext*/ false); 2977 2978 return DeclPtrTy::make(UD); 2979} 2980 2981/// Determines whether to create a using shadow decl for a particular 2982/// decl, given the set of decls existing prior to this using lookup. 2983bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 2984 const LookupResult &Previous) { 2985 // Diagnose finding a decl which is not from a base class of the 2986 // current class. We do this now because there are cases where this 2987 // function will silently decide not to build a shadow decl, which 2988 // will pre-empt further diagnostics. 2989 // 2990 // We don't need to do this in C++0x because we do the check once on 2991 // the qualifier. 2992 // 2993 // FIXME: diagnose the following if we care enough: 2994 // struct A { int foo; }; 2995 // struct B : A { using A::foo; }; 2996 // template <class T> struct C : A {}; 2997 // template <class T> struct D : C<T> { using B::foo; } // <--- 2998 // This is invalid (during instantiation) in C++03 because B::foo 2999 // resolves to the using decl in B, which is not a base class of D<T>. 3000 // We can't diagnose it immediately because C<T> is an unknown 3001 // specialization. The UsingShadowDecl in D<T> then points directly 3002 // to A::foo, which will look well-formed when we instantiate. 3003 // The right solution is to not collapse the shadow-decl chain. 3004 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3005 DeclContext *OrigDC = Orig->getDeclContext(); 3006 3007 // Handle enums and anonymous structs. 3008 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3009 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3010 while (OrigRec->isAnonymousStructOrUnion()) 3011 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3012 3013 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3014 if (OrigDC == CurContext) { 3015 Diag(Using->getLocation(), 3016 diag::err_using_decl_nested_name_specifier_is_current_class) 3017 << Using->getNestedNameRange(); 3018 Diag(Orig->getLocation(), diag::note_using_decl_target); 3019 return true; 3020 } 3021 3022 Diag(Using->getNestedNameRange().getBegin(), 3023 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3024 << Using->getTargetNestedNameDecl() 3025 << cast<CXXRecordDecl>(CurContext) 3026 << Using->getNestedNameRange(); 3027 Diag(Orig->getLocation(), diag::note_using_decl_target); 3028 return true; 3029 } 3030 } 3031 3032 if (Previous.empty()) return false; 3033 3034 NamedDecl *Target = Orig; 3035 if (isa<UsingShadowDecl>(Target)) 3036 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3037 3038 // If the target happens to be one of the previous declarations, we 3039 // don't have a conflict. 3040 // 3041 // FIXME: but we might be increasing its access, in which case we 3042 // should redeclare it. 3043 NamedDecl *NonTag = 0, *Tag = 0; 3044 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3045 I != E; ++I) { 3046 NamedDecl *D = (*I)->getUnderlyingDecl(); 3047 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3048 return false; 3049 3050 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3051 } 3052 3053 if (Target->isFunctionOrFunctionTemplate()) { 3054 FunctionDecl *FD; 3055 if (isa<FunctionTemplateDecl>(Target)) 3056 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3057 else 3058 FD = cast<FunctionDecl>(Target); 3059 3060 NamedDecl *OldDecl = 0; 3061 switch (CheckOverload(FD, Previous, OldDecl)) { 3062 case Ovl_Overload: 3063 return false; 3064 3065 case Ovl_NonFunction: 3066 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3067 break; 3068 3069 // We found a decl with the exact signature. 3070 case Ovl_Match: 3071 if (isa<UsingShadowDecl>(OldDecl)) { 3072 // Silently ignore the possible conflict. 3073 return false; 3074 } 3075 3076 // If we're in a record, we want to hide the target, so we 3077 // return true (without a diagnostic) to tell the caller not to 3078 // build a shadow decl. 3079 if (CurContext->isRecord()) 3080 return true; 3081 3082 // If we're not in a record, this is an error. 3083 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3084 break; 3085 } 3086 3087 Diag(Target->getLocation(), diag::note_using_decl_target); 3088 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3089 return true; 3090 } 3091 3092 // Target is not a function. 3093 3094 if (isa<TagDecl>(Target)) { 3095 // No conflict between a tag and a non-tag. 3096 if (!Tag) return false; 3097 3098 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3099 Diag(Target->getLocation(), diag::note_using_decl_target); 3100 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3101 return true; 3102 } 3103 3104 // No conflict between a tag and a non-tag. 3105 if (!NonTag) return false; 3106 3107 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3108 Diag(Target->getLocation(), diag::note_using_decl_target); 3109 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3110 return true; 3111} 3112 3113/// Builds a shadow declaration corresponding to a 'using' declaration. 3114UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3115 UsingDecl *UD, 3116 NamedDecl *Orig) { 3117 3118 // If we resolved to another shadow declaration, just coalesce them. 3119 NamedDecl *Target = Orig; 3120 if (isa<UsingShadowDecl>(Target)) { 3121 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3122 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3123 } 3124 3125 UsingShadowDecl *Shadow 3126 = UsingShadowDecl::Create(Context, CurContext, 3127 UD->getLocation(), UD, Target); 3128 UD->addShadowDecl(Shadow); 3129 3130 if (S) 3131 PushOnScopeChains(Shadow, S); 3132 else 3133 CurContext->addDecl(Shadow); 3134 Shadow->setAccess(UD->getAccess()); 3135 3136 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3137 Shadow->setInvalidDecl(); 3138 3139 return Shadow; 3140} 3141 3142/// Hides a using shadow declaration. This is required by the current 3143/// using-decl implementation when a resolvable using declaration in a 3144/// class is followed by a declaration which would hide or override 3145/// one or more of the using decl's targets; for example: 3146/// 3147/// struct Base { void foo(int); }; 3148/// struct Derived : Base { 3149/// using Base::foo; 3150/// void foo(int); 3151/// }; 3152/// 3153/// The governing language is C++03 [namespace.udecl]p12: 3154/// 3155/// When a using-declaration brings names from a base class into a 3156/// derived class scope, member functions in the derived class 3157/// override and/or hide member functions with the same name and 3158/// parameter types in a base class (rather than conflicting). 3159/// 3160/// There are two ways to implement this: 3161/// (1) optimistically create shadow decls when they're not hidden 3162/// by existing declarations, or 3163/// (2) don't create any shadow decls (or at least don't make them 3164/// visible) until we've fully parsed/instantiated the class. 3165/// The problem with (1) is that we might have to retroactively remove 3166/// a shadow decl, which requires several O(n) operations because the 3167/// decl structures are (very reasonably) not designed for removal. 3168/// (2) avoids this but is very fiddly and phase-dependent. 3169void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3170 // Remove it from the DeclContext... 3171 Shadow->getDeclContext()->removeDecl(Shadow); 3172 3173 // ...and the scope, if applicable... 3174 if (S) { 3175 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3176 IdResolver.RemoveDecl(Shadow); 3177 } 3178 3179 // ...and the using decl. 3180 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3181 3182 // TODO: complain somehow if Shadow was used. It shouldn't 3183 // be possible for this to happen, because 3184} 3185 3186/// Builds a using declaration. 3187/// 3188/// \param IsInstantiation - Whether this call arises from an 3189/// instantiation of an unresolved using declaration. We treat 3190/// the lookup differently for these declarations. 3191NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3192 SourceLocation UsingLoc, 3193 const CXXScopeSpec &SS, 3194 SourceLocation IdentLoc, 3195 DeclarationName Name, 3196 AttributeList *AttrList, 3197 bool IsInstantiation, 3198 bool IsTypeName, 3199 SourceLocation TypenameLoc) { 3200 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3201 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3202 3203 // FIXME: We ignore attributes for now. 3204 delete AttrList; 3205 3206 if (SS.isEmpty()) { 3207 Diag(IdentLoc, diag::err_using_requires_qualname); 3208 return 0; 3209 } 3210 3211 // Do the redeclaration lookup in the current scope. 3212 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3213 ForRedeclaration); 3214 Previous.setHideTags(false); 3215 if (S) { 3216 LookupName(Previous, S); 3217 3218 // It is really dumb that we have to do this. 3219 LookupResult::Filter F = Previous.makeFilter(); 3220 while (F.hasNext()) { 3221 NamedDecl *D = F.next(); 3222 if (!isDeclInScope(D, CurContext, S)) 3223 F.erase(); 3224 } 3225 F.done(); 3226 } else { 3227 assert(IsInstantiation && "no scope in non-instantiation"); 3228 assert(CurContext->isRecord() && "scope not record in instantiation"); 3229 LookupQualifiedName(Previous, CurContext); 3230 } 3231 3232 NestedNameSpecifier *NNS = 3233 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3234 3235 // Check for invalid redeclarations. 3236 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3237 return 0; 3238 3239 // Check for bad qualifiers. 3240 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3241 return 0; 3242 3243 DeclContext *LookupContext = computeDeclContext(SS); 3244 NamedDecl *D; 3245 if (!LookupContext) { 3246 if (IsTypeName) { 3247 // FIXME: not all declaration name kinds are legal here 3248 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3249 UsingLoc, TypenameLoc, 3250 SS.getRange(), NNS, 3251 IdentLoc, Name); 3252 } else { 3253 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3254 UsingLoc, SS.getRange(), NNS, 3255 IdentLoc, Name); 3256 } 3257 } else { 3258 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3259 SS.getRange(), UsingLoc, NNS, Name, 3260 IsTypeName); 3261 } 3262 D->setAccess(AS); 3263 CurContext->addDecl(D); 3264 3265 if (!LookupContext) return D; 3266 UsingDecl *UD = cast<UsingDecl>(D); 3267 3268 if (RequireCompleteDeclContext(SS)) { 3269 UD->setInvalidDecl(); 3270 return UD; 3271 } 3272 3273 // Look up the target name. 3274 3275 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3276 3277 // Unlike most lookups, we don't always want to hide tag 3278 // declarations: tag names are visible through the using declaration 3279 // even if hidden by ordinary names, *except* in a dependent context 3280 // where it's important for the sanity of two-phase lookup. 3281 if (!IsInstantiation) 3282 R.setHideTags(false); 3283 3284 LookupQualifiedName(R, LookupContext); 3285 3286 if (R.empty()) { 3287 Diag(IdentLoc, diag::err_no_member) 3288 << Name << LookupContext << SS.getRange(); 3289 UD->setInvalidDecl(); 3290 return UD; 3291 } 3292 3293 if (R.isAmbiguous()) { 3294 UD->setInvalidDecl(); 3295 return UD; 3296 } 3297 3298 if (IsTypeName) { 3299 // If we asked for a typename and got a non-type decl, error out. 3300 if (!R.getAsSingle<TypeDecl>()) { 3301 Diag(IdentLoc, diag::err_using_typename_non_type); 3302 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3303 Diag((*I)->getUnderlyingDecl()->getLocation(), 3304 diag::note_using_decl_target); 3305 UD->setInvalidDecl(); 3306 return UD; 3307 } 3308 } else { 3309 // If we asked for a non-typename and we got a type, error out, 3310 // but only if this is an instantiation of an unresolved using 3311 // decl. Otherwise just silently find the type name. 3312 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3313 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3314 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3315 UD->setInvalidDecl(); 3316 return UD; 3317 } 3318 } 3319 3320 // C++0x N2914 [namespace.udecl]p6: 3321 // A using-declaration shall not name a namespace. 3322 if (R.getAsSingle<NamespaceDecl>()) { 3323 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3324 << SS.getRange(); 3325 UD->setInvalidDecl(); 3326 return UD; 3327 } 3328 3329 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3330 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3331 BuildUsingShadowDecl(S, UD, *I); 3332 } 3333 3334 return UD; 3335} 3336 3337/// Checks that the given using declaration is not an invalid 3338/// redeclaration. Note that this is checking only for the using decl 3339/// itself, not for any ill-formedness among the UsingShadowDecls. 3340bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3341 bool isTypeName, 3342 const CXXScopeSpec &SS, 3343 SourceLocation NameLoc, 3344 const LookupResult &Prev) { 3345 // C++03 [namespace.udecl]p8: 3346 // C++0x [namespace.udecl]p10: 3347 // A using-declaration is a declaration and can therefore be used 3348 // repeatedly where (and only where) multiple declarations are 3349 // allowed. 3350 // That's only in file contexts. 3351 if (CurContext->getLookupContext()->isFileContext()) 3352 return false; 3353 3354 NestedNameSpecifier *Qual 3355 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3356 3357 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3358 NamedDecl *D = *I; 3359 3360 bool DTypename; 3361 NestedNameSpecifier *DQual; 3362 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3363 DTypename = UD->isTypeName(); 3364 DQual = UD->getTargetNestedNameDecl(); 3365 } else if (UnresolvedUsingValueDecl *UD 3366 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3367 DTypename = false; 3368 DQual = UD->getTargetNestedNameSpecifier(); 3369 } else if (UnresolvedUsingTypenameDecl *UD 3370 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3371 DTypename = true; 3372 DQual = UD->getTargetNestedNameSpecifier(); 3373 } else continue; 3374 3375 // using decls differ if one says 'typename' and the other doesn't. 3376 // FIXME: non-dependent using decls? 3377 if (isTypeName != DTypename) continue; 3378 3379 // using decls differ if they name different scopes (but note that 3380 // template instantiation can cause this check to trigger when it 3381 // didn't before instantiation). 3382 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3383 Context.getCanonicalNestedNameSpecifier(DQual)) 3384 continue; 3385 3386 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3387 Diag(D->getLocation(), diag::note_using_decl) << 1; 3388 return true; 3389 } 3390 3391 return false; 3392} 3393 3394 3395/// Checks that the given nested-name qualifier used in a using decl 3396/// in the current context is appropriately related to the current 3397/// scope. If an error is found, diagnoses it and returns true. 3398bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3399 const CXXScopeSpec &SS, 3400 SourceLocation NameLoc) { 3401 DeclContext *NamedContext = computeDeclContext(SS); 3402 3403 if (!CurContext->isRecord()) { 3404 // C++03 [namespace.udecl]p3: 3405 // C++0x [namespace.udecl]p8: 3406 // A using-declaration for a class member shall be a member-declaration. 3407 3408 // If we weren't able to compute a valid scope, it must be a 3409 // dependent class scope. 3410 if (!NamedContext || NamedContext->isRecord()) { 3411 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3412 << SS.getRange(); 3413 return true; 3414 } 3415 3416 // Otherwise, everything is known to be fine. 3417 return false; 3418 } 3419 3420 // The current scope is a record. 3421 3422 // If the named context is dependent, we can't decide much. 3423 if (!NamedContext) { 3424 // FIXME: in C++0x, we can diagnose if we can prove that the 3425 // nested-name-specifier does not refer to a base class, which is 3426 // still possible in some cases. 3427 3428 // Otherwise we have to conservatively report that things might be 3429 // okay. 3430 return false; 3431 } 3432 3433 if (!NamedContext->isRecord()) { 3434 // Ideally this would point at the last name in the specifier, 3435 // but we don't have that level of source info. 3436 Diag(SS.getRange().getBegin(), 3437 diag::err_using_decl_nested_name_specifier_is_not_class) 3438 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3439 return true; 3440 } 3441 3442 if (getLangOptions().CPlusPlus0x) { 3443 // C++0x [namespace.udecl]p3: 3444 // In a using-declaration used as a member-declaration, the 3445 // nested-name-specifier shall name a base class of the class 3446 // being defined. 3447 3448 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3449 cast<CXXRecordDecl>(NamedContext))) { 3450 if (CurContext == NamedContext) { 3451 Diag(NameLoc, 3452 diag::err_using_decl_nested_name_specifier_is_current_class) 3453 << SS.getRange(); 3454 return true; 3455 } 3456 3457 Diag(SS.getRange().getBegin(), 3458 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3459 << (NestedNameSpecifier*) SS.getScopeRep() 3460 << cast<CXXRecordDecl>(CurContext) 3461 << SS.getRange(); 3462 return true; 3463 } 3464 3465 return false; 3466 } 3467 3468 // C++03 [namespace.udecl]p4: 3469 // A using-declaration used as a member-declaration shall refer 3470 // to a member of a base class of the class being defined [etc.]. 3471 3472 // Salient point: SS doesn't have to name a base class as long as 3473 // lookup only finds members from base classes. Therefore we can 3474 // diagnose here only if we can prove that that can't happen, 3475 // i.e. if the class hierarchies provably don't intersect. 3476 3477 // TODO: it would be nice if "definitely valid" results were cached 3478 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3479 // need to be repeated. 3480 3481 struct UserData { 3482 llvm::DenseSet<const CXXRecordDecl*> Bases; 3483 3484 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3485 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3486 Data->Bases.insert(Base); 3487 return true; 3488 } 3489 3490 bool hasDependentBases(const CXXRecordDecl *Class) { 3491 return !Class->forallBases(collect, this); 3492 } 3493 3494 /// Returns true if the base is dependent or is one of the 3495 /// accumulated base classes. 3496 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3497 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3498 return !Data->Bases.count(Base); 3499 } 3500 3501 bool mightShareBases(const CXXRecordDecl *Class) { 3502 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3503 } 3504 }; 3505 3506 UserData Data; 3507 3508 // Returns false if we find a dependent base. 3509 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3510 return false; 3511 3512 // Returns false if the class has a dependent base or if it or one 3513 // of its bases is present in the base set of the current context. 3514 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3515 return false; 3516 3517 Diag(SS.getRange().getBegin(), 3518 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3519 << (NestedNameSpecifier*) SS.getScopeRep() 3520 << cast<CXXRecordDecl>(CurContext) 3521 << SS.getRange(); 3522 3523 return true; 3524} 3525 3526Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3527 SourceLocation NamespaceLoc, 3528 SourceLocation AliasLoc, 3529 IdentifierInfo *Alias, 3530 const CXXScopeSpec &SS, 3531 SourceLocation IdentLoc, 3532 IdentifierInfo *Ident) { 3533 3534 // Lookup the namespace name. 3535 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3536 LookupParsedName(R, S, &SS); 3537 3538 // Check if we have a previous declaration with the same name. 3539 if (NamedDecl *PrevDecl 3540 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3541 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3542 // We already have an alias with the same name that points to the same 3543 // namespace, so don't create a new one. 3544 if (!R.isAmbiguous() && !R.empty() && 3545 AD->getNamespace() == getNamespaceDecl(R.getFoundDecl())) 3546 return DeclPtrTy(); 3547 } 3548 3549 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3550 diag::err_redefinition_different_kind; 3551 Diag(AliasLoc, DiagID) << Alias; 3552 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3553 return DeclPtrTy(); 3554 } 3555 3556 if (R.isAmbiguous()) 3557 return DeclPtrTy(); 3558 3559 if (R.empty()) { 3560 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3561 return DeclPtrTy(); 3562 } 3563 3564 NamespaceAliasDecl *AliasDecl = 3565 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3566 Alias, SS.getRange(), 3567 (NestedNameSpecifier *)SS.getScopeRep(), 3568 IdentLoc, R.getFoundDecl()); 3569 3570 CurContext->addDecl(AliasDecl); 3571 return DeclPtrTy::make(AliasDecl); 3572} 3573 3574void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3575 CXXConstructorDecl *Constructor) { 3576 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3577 !Constructor->isUsed()) && 3578 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3579 3580 CXXRecordDecl *ClassDecl 3581 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3582 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3583 3584 if (SetBaseOrMemberInitializers(Constructor, 0, 0, true)) { 3585 Diag(CurrentLocation, diag::note_member_synthesized_at) 3586 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 3587 Constructor->setInvalidDecl(); 3588 } else { 3589 Constructor->setUsed(); 3590 } 3591} 3592 3593void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3594 CXXDestructorDecl *Destructor) { 3595 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3596 "DefineImplicitDestructor - call it for implicit default dtor"); 3597 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3598 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3599 // C++ [class.dtor] p5 3600 // Before the implicitly-declared default destructor for a class is 3601 // implicitly defined, all the implicitly-declared default destructors 3602 // for its base class and its non-static data members shall have been 3603 // implicitly defined. 3604 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3605 E = ClassDecl->bases_end(); Base != E; ++Base) { 3606 CXXRecordDecl *BaseClassDecl 3607 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3608 if (!BaseClassDecl->hasTrivialDestructor()) { 3609 if (CXXDestructorDecl *BaseDtor = 3610 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 3611 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 3612 else 3613 assert(false && 3614 "DefineImplicitDestructor - missing dtor in a base class"); 3615 } 3616 } 3617 3618 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3619 E = ClassDecl->field_end(); Field != E; ++Field) { 3620 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3621 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3622 FieldType = Array->getElementType(); 3623 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3624 CXXRecordDecl *FieldClassDecl 3625 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3626 if (!FieldClassDecl->hasTrivialDestructor()) { 3627 if (CXXDestructorDecl *FieldDtor = 3628 const_cast<CXXDestructorDecl*>( 3629 FieldClassDecl->getDestructor(Context))) 3630 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 3631 else 3632 assert(false && 3633 "DefineImplicitDestructor - missing dtor in class of a data member"); 3634 } 3635 } 3636 } 3637 3638 // FIXME: If CheckDestructor fails, we should emit a note about where the 3639 // implicit destructor was needed. 3640 if (CheckDestructor(Destructor)) { 3641 Diag(CurrentLocation, diag::note_member_synthesized_at) 3642 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3643 3644 Destructor->setInvalidDecl(); 3645 return; 3646 } 3647 3648 Destructor->setUsed(); 3649} 3650 3651void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3652 CXXMethodDecl *MethodDecl) { 3653 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3654 MethodDecl->getOverloadedOperator() == OO_Equal && 3655 !MethodDecl->isUsed()) && 3656 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3657 3658 CXXRecordDecl *ClassDecl 3659 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3660 3661 // C++[class.copy] p12 3662 // Before the implicitly-declared copy assignment operator for a class is 3663 // implicitly defined, all implicitly-declared copy assignment operators 3664 // for its direct base classes and its nonstatic data members shall have 3665 // been implicitly defined. 3666 bool err = false; 3667 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3668 E = ClassDecl->bases_end(); Base != E; ++Base) { 3669 CXXRecordDecl *BaseClassDecl 3670 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3671 if (CXXMethodDecl *BaseAssignOpMethod = 3672 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3673 BaseClassDecl)) 3674 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3675 } 3676 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3677 E = ClassDecl->field_end(); Field != E; ++Field) { 3678 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3679 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3680 FieldType = Array->getElementType(); 3681 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3682 CXXRecordDecl *FieldClassDecl 3683 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3684 if (CXXMethodDecl *FieldAssignOpMethod = 3685 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3686 FieldClassDecl)) 3687 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3688 } else if (FieldType->isReferenceType()) { 3689 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3690 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3691 Diag(Field->getLocation(), diag::note_declared_at); 3692 Diag(CurrentLocation, diag::note_first_required_here); 3693 err = true; 3694 } else if (FieldType.isConstQualified()) { 3695 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3696 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3697 Diag(Field->getLocation(), diag::note_declared_at); 3698 Diag(CurrentLocation, diag::note_first_required_here); 3699 err = true; 3700 } 3701 } 3702 if (!err) 3703 MethodDecl->setUsed(); 3704} 3705 3706CXXMethodDecl * 3707Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 3708 ParmVarDecl *ParmDecl, 3709 CXXRecordDecl *ClassDecl) { 3710 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3711 QualType RHSType(LHSType); 3712 // If class's assignment operator argument is const/volatile qualified, 3713 // look for operator = (const/volatile B&). Otherwise, look for 3714 // operator = (B&). 3715 RHSType = Context.getCVRQualifiedType(RHSType, 3716 ParmDecl->getType().getCVRQualifiers()); 3717 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3718 LHSType, 3719 SourceLocation())); 3720 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3721 RHSType, 3722 CurrentLocation)); 3723 Expr *Args[2] = { &*LHS, &*RHS }; 3724 OverloadCandidateSet CandidateSet; 3725 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3726 CandidateSet); 3727 OverloadCandidateSet::iterator Best; 3728 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 3729 return cast<CXXMethodDecl>(Best->Function); 3730 assert(false && 3731 "getAssignOperatorMethod - copy assignment operator method not found"); 3732 return 0; 3733} 3734 3735void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3736 CXXConstructorDecl *CopyConstructor, 3737 unsigned TypeQuals) { 3738 assert((CopyConstructor->isImplicit() && 3739 CopyConstructor->isCopyConstructor(TypeQuals) && 3740 !CopyConstructor->isUsed()) && 3741 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3742 3743 CXXRecordDecl *ClassDecl 3744 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3745 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3746 // C++ [class.copy] p209 3747 // Before the implicitly-declared copy constructor for a class is 3748 // implicitly defined, all the implicitly-declared copy constructors 3749 // for its base class and its non-static data members shall have been 3750 // implicitly defined. 3751 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3752 Base != ClassDecl->bases_end(); ++Base) { 3753 CXXRecordDecl *BaseClassDecl 3754 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3755 if (CXXConstructorDecl *BaseCopyCtor = 3756 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 3757 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3758 } 3759 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3760 FieldEnd = ClassDecl->field_end(); 3761 Field != FieldEnd; ++Field) { 3762 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3763 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3764 FieldType = Array->getElementType(); 3765 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3766 CXXRecordDecl *FieldClassDecl 3767 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3768 if (CXXConstructorDecl *FieldCopyCtor = 3769 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 3770 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3771 } 3772 } 3773 CopyConstructor->setUsed(); 3774} 3775 3776Sema::OwningExprResult 3777Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3778 CXXConstructorDecl *Constructor, 3779 MultiExprArg ExprArgs, 3780 bool RequiresZeroInit) { 3781 bool Elidable = false; 3782 3783 // C++ [class.copy]p15: 3784 // Whenever a temporary class object is copied using a copy constructor, and 3785 // this object and the copy have the same cv-unqualified type, an 3786 // implementation is permitted to treat the original and the copy as two 3787 // different ways of referring to the same object and not perform a copy at 3788 // all, even if the class copy constructor or destructor have side effects. 3789 3790 // FIXME: Is this enough? 3791 if (Constructor->isCopyConstructor()) { 3792 Expr *E = ((Expr **)ExprArgs.get())[0]; 3793 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3794 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3795 E = ICE->getSubExpr(); 3796 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 3797 E = BE->getSubExpr(); 3798 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3799 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3800 E = ICE->getSubExpr(); 3801 3802 if (CallExpr *CE = dyn_cast<CallExpr>(E)) 3803 Elidable = !CE->getCallReturnType()->isReferenceType(); 3804 else if (isa<CXXTemporaryObjectExpr>(E)) 3805 Elidable = true; 3806 } 3807 3808 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 3809 Elidable, move(ExprArgs), RequiresZeroInit); 3810} 3811 3812/// BuildCXXConstructExpr - Creates a complete call to a constructor, 3813/// including handling of its default argument expressions. 3814Sema::OwningExprResult 3815Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3816 CXXConstructorDecl *Constructor, bool Elidable, 3817 MultiExprArg ExprArgs, 3818 bool RequiresZeroInit) { 3819 unsigned NumExprs = ExprArgs.size(); 3820 Expr **Exprs = (Expr **)ExprArgs.release(); 3821 3822 MarkDeclarationReferenced(ConstructLoc, Constructor); 3823 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 3824 Constructor, Elidable, Exprs, NumExprs, 3825 RequiresZeroInit)); 3826} 3827 3828Sema::OwningExprResult 3829Sema::BuildCXXTemporaryObjectExpr(CXXConstructorDecl *Constructor, 3830 QualType Ty, 3831 SourceLocation TyBeginLoc, 3832 MultiExprArg Args, 3833 SourceLocation RParenLoc) { 3834 unsigned NumExprs = Args.size(); 3835 Expr **Exprs = (Expr **)Args.release(); 3836 3837 MarkDeclarationReferenced(TyBeginLoc, Constructor); 3838 return Owned(new (Context) CXXTemporaryObjectExpr(Context, Constructor, Ty, 3839 TyBeginLoc, Exprs, 3840 NumExprs, RParenLoc)); 3841} 3842 3843 3844bool Sema::InitializeVarWithConstructor(VarDecl *VD, 3845 CXXConstructorDecl *Constructor, 3846 MultiExprArg Exprs) { 3847 OwningExprResult TempResult = 3848 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 3849 move(Exprs)); 3850 if (TempResult.isInvalid()) 3851 return true; 3852 3853 Expr *Temp = TempResult.takeAs<Expr>(); 3854 MarkDeclarationReferenced(VD->getLocation(), Constructor); 3855 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 3856 VD->setInit(Context, Temp); 3857 3858 return false; 3859} 3860 3861void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) { 3862 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 3863 DeclInitType->getAs<RecordType>()->getDecl()); 3864 if (!ClassDecl->hasTrivialDestructor()) 3865 if (CXXDestructorDecl *Destructor = 3866 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 3867 MarkDeclarationReferenced(VD->getLocation(), Destructor); 3868} 3869 3870/// AddCXXDirectInitializerToDecl - This action is called immediately after 3871/// ActOnDeclarator, when a C++ direct initializer is present. 3872/// e.g: "int x(1);" 3873void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 3874 SourceLocation LParenLoc, 3875 MultiExprArg Exprs, 3876 SourceLocation *CommaLocs, 3877 SourceLocation RParenLoc) { 3878 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 3879 Decl *RealDecl = Dcl.getAs<Decl>(); 3880 3881 // If there is no declaration, there was an error parsing it. Just ignore 3882 // the initializer. 3883 if (RealDecl == 0) 3884 return; 3885 3886 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3887 if (!VDecl) { 3888 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3889 RealDecl->setInvalidDecl(); 3890 return; 3891 } 3892 3893 // We will represent direct-initialization similarly to copy-initialization: 3894 // int x(1); -as-> int x = 1; 3895 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 3896 // 3897 // Clients that want to distinguish between the two forms, can check for 3898 // direct initializer using VarDecl::hasCXXDirectInitializer(). 3899 // A major benefit is that clients that don't particularly care about which 3900 // exactly form was it (like the CodeGen) can handle both cases without 3901 // special case code. 3902 3903 // If either the declaration has a dependent type or if any of the expressions 3904 // is type-dependent, we represent the initialization via a ParenListExpr for 3905 // later use during template instantiation. 3906 if (VDecl->getType()->isDependentType() || 3907 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 3908 // Let clients know that initialization was done with a direct initializer. 3909 VDecl->setCXXDirectInitializer(true); 3910 3911 // Store the initialization expressions as a ParenListExpr. 3912 unsigned NumExprs = Exprs.size(); 3913 VDecl->setInit(Context, 3914 new (Context) ParenListExpr(Context, LParenLoc, 3915 (Expr **)Exprs.release(), 3916 NumExprs, RParenLoc)); 3917 return; 3918 } 3919 3920 3921 // C++ 8.5p11: 3922 // The form of initialization (using parentheses or '=') is generally 3923 // insignificant, but does matter when the entity being initialized has a 3924 // class type. 3925 QualType DeclInitType = VDecl->getType(); 3926 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 3927 DeclInitType = Context.getBaseElementType(Array); 3928 3929 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 3930 diag::err_typecheck_decl_incomplete_type)) { 3931 VDecl->setInvalidDecl(); 3932 return; 3933 } 3934 3935 // The variable can not have an abstract class type. 3936 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 3937 diag::err_abstract_type_in_decl, 3938 AbstractVariableType)) 3939 VDecl->setInvalidDecl(); 3940 3941 const VarDecl *Def = 0; 3942 if (VDecl->getDefinition(Def)) { 3943 Diag(VDecl->getLocation(), diag::err_redefinition) 3944 << VDecl->getDeclName(); 3945 Diag(Def->getLocation(), diag::note_previous_definition); 3946 VDecl->setInvalidDecl(); 3947 return; 3948 } 3949 3950 // Capture the variable that is being initialized and the style of 3951 // initialization. 3952 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 3953 3954 // FIXME: Poor source location information. 3955 InitializationKind Kind 3956 = InitializationKind::CreateDirect(VDecl->getLocation(), 3957 LParenLoc, RParenLoc); 3958 3959 InitializationSequence InitSeq(*this, Entity, Kind, 3960 (Expr**)Exprs.get(), Exprs.size()); 3961 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 3962 if (Result.isInvalid()) { 3963 VDecl->setInvalidDecl(); 3964 return; 3965 } 3966 3967 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 3968 VDecl->setInit(Context, Result.takeAs<Expr>()); 3969 VDecl->setCXXDirectInitializer(true); 3970 3971 if (VDecl->getType()->getAs<RecordType>()) 3972 FinalizeVarWithDestructor(VDecl, DeclInitType); 3973} 3974 3975/// \brief Add the applicable constructor candidates for an initialization 3976/// by constructor. 3977static void AddConstructorInitializationCandidates(Sema &SemaRef, 3978 QualType ClassType, 3979 Expr **Args, 3980 unsigned NumArgs, 3981 InitializationKind Kind, 3982 OverloadCandidateSet &CandidateSet) { 3983 // C++ [dcl.init]p14: 3984 // If the initialization is direct-initialization, or if it is 3985 // copy-initialization where the cv-unqualified version of the 3986 // source type is the same class as, or a derived class of, the 3987 // class of the destination, constructors are considered. The 3988 // applicable constructors are enumerated (13.3.1.3), and the 3989 // best one is chosen through overload resolution (13.3). The 3990 // constructor so selected is called to initialize the object, 3991 // with the initializer expression(s) as its argument(s). If no 3992 // constructor applies, or the overload resolution is ambiguous, 3993 // the initialization is ill-formed. 3994 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 3995 assert(ClassRec && "Can only initialize a class type here"); 3996 3997 // FIXME: When we decide not to synthesize the implicitly-declared 3998 // constructors, we'll need to make them appear here. 3999 4000 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 4001 DeclarationName ConstructorName 4002 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 4003 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 4004 DeclContext::lookup_const_iterator Con, ConEnd; 4005 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 4006 Con != ConEnd; ++Con) { 4007 // Find the constructor (which may be a template). 4008 CXXConstructorDecl *Constructor = 0; 4009 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 4010 if (ConstructorTmpl) 4011 Constructor 4012 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 4013 else 4014 Constructor = cast<CXXConstructorDecl>(*Con); 4015 4016 if ((Kind.getKind() == InitializationKind::IK_Direct) || 4017 (Kind.getKind() == InitializationKind::IK_Value) || 4018 (Kind.getKind() == InitializationKind::IK_Copy && 4019 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 4020 ((Kind.getKind() == InitializationKind::IK_Default) && 4021 Constructor->isDefaultConstructor())) { 4022 if (ConstructorTmpl) 4023 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, 4024 /*ExplicitArgs*/ 0, 4025 Args, NumArgs, CandidateSet); 4026 else 4027 SemaRef.AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 4028 } 4029 } 4030} 4031 4032/// \brief Attempt to perform initialization by constructor 4033/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 4034/// copy-initialization. 4035/// 4036/// This routine determines whether initialization by constructor is possible, 4037/// but it does not emit any diagnostics in the case where the initialization 4038/// is ill-formed. 4039/// 4040/// \param ClassType the type of the object being initialized, which must have 4041/// class type. 4042/// 4043/// \param Args the arguments provided to initialize the object 4044/// 4045/// \param NumArgs the number of arguments provided to initialize the object 4046/// 4047/// \param Kind the type of initialization being performed 4048/// 4049/// \returns the constructor used to initialize the object, if successful. 4050/// Otherwise, emits a diagnostic and returns NULL. 4051CXXConstructorDecl * 4052Sema::TryInitializationByConstructor(QualType ClassType, 4053 Expr **Args, unsigned NumArgs, 4054 SourceLocation Loc, 4055 InitializationKind Kind) { 4056 // Build the overload candidate set 4057 OverloadCandidateSet CandidateSet; 4058 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4059 CandidateSet); 4060 4061 // Determine whether we found a constructor we can use. 4062 OverloadCandidateSet::iterator Best; 4063 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4064 case OR_Success: 4065 case OR_Deleted: 4066 // We found a constructor. Return it. 4067 return cast<CXXConstructorDecl>(Best->Function); 4068 4069 case OR_No_Viable_Function: 4070 case OR_Ambiguous: 4071 // Overload resolution failed. Return nothing. 4072 return 0; 4073 } 4074 4075 // Silence GCC warning 4076 return 0; 4077} 4078 4079/// \brief Perform initialization by constructor (C++ [dcl.init]p14), which 4080/// may occur as part of direct-initialization or copy-initialization. 4081/// 4082/// \param ClassType the type of the object being initialized, which must have 4083/// class type. 4084/// 4085/// \param ArgsPtr the arguments provided to initialize the object 4086/// 4087/// \param Loc the source location where the initialization occurs 4088/// 4089/// \param Range the source range that covers the entire initialization 4090/// 4091/// \param InitEntity the name of the entity being initialized, if known 4092/// 4093/// \param Kind the type of initialization being performed 4094/// 4095/// \param ConvertedArgs a vector that will be filled in with the 4096/// appropriately-converted arguments to the constructor (if initialization 4097/// succeeded). 4098/// 4099/// \returns the constructor used to initialize the object, if successful. 4100/// Otherwise, emits a diagnostic and returns NULL. 4101CXXConstructorDecl * 4102Sema::PerformInitializationByConstructor(QualType ClassType, 4103 MultiExprArg ArgsPtr, 4104 SourceLocation Loc, SourceRange Range, 4105 DeclarationName InitEntity, 4106 InitializationKind Kind, 4107 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4108 4109 // Build the overload candidate set 4110 Expr **Args = (Expr **)ArgsPtr.get(); 4111 unsigned NumArgs = ArgsPtr.size(); 4112 OverloadCandidateSet CandidateSet; 4113 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4114 CandidateSet); 4115 4116 OverloadCandidateSet::iterator Best; 4117 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4118 case OR_Success: 4119 // We found a constructor. Break out so that we can convert the arguments 4120 // appropriately. 4121 break; 4122 4123 case OR_No_Viable_Function: 4124 if (InitEntity) 4125 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 4126 << InitEntity << Range; 4127 else 4128 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 4129 << ClassType << Range; 4130 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 4131 return 0; 4132 4133 case OR_Ambiguous: 4134 if (InitEntity) 4135 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 4136 else 4137 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 4138 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 4139 return 0; 4140 4141 case OR_Deleted: 4142 if (InitEntity) 4143 Diag(Loc, diag::err_ovl_deleted_init) 4144 << Best->Function->isDeleted() 4145 << InitEntity << Range; 4146 else { 4147 const CXXRecordDecl *RD = 4148 cast<CXXRecordDecl>(ClassType->getAs<RecordType>()->getDecl()); 4149 Diag(Loc, diag::err_ovl_deleted_init) 4150 << Best->Function->isDeleted() 4151 << RD->getDeclName() << Range; 4152 } 4153 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 4154 return 0; 4155 } 4156 4157 // Convert the arguments, fill in default arguments, etc. 4158 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function); 4159 if (CompleteConstructorCall(Constructor, move(ArgsPtr), Loc, ConvertedArgs)) 4160 return 0; 4161 4162 return Constructor; 4163} 4164 4165/// \brief Given a constructor and the set of arguments provided for the 4166/// constructor, convert the arguments and add any required default arguments 4167/// to form a proper call to this constructor. 4168/// 4169/// \returns true if an error occurred, false otherwise. 4170bool 4171Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4172 MultiExprArg ArgsPtr, 4173 SourceLocation Loc, 4174 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4175 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4176 unsigned NumArgs = ArgsPtr.size(); 4177 Expr **Args = (Expr **)ArgsPtr.get(); 4178 4179 const FunctionProtoType *Proto 4180 = Constructor->getType()->getAs<FunctionProtoType>(); 4181 assert(Proto && "Constructor without a prototype?"); 4182 unsigned NumArgsInProto = Proto->getNumArgs(); 4183 4184 // If too few arguments are available, we'll fill in the rest with defaults. 4185 if (NumArgs < NumArgsInProto) 4186 ConvertedArgs.reserve(NumArgsInProto); 4187 else 4188 ConvertedArgs.reserve(NumArgs); 4189 4190 VariadicCallType CallType = 4191 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4192 llvm::SmallVector<Expr *, 8> AllArgs; 4193 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4194 Proto, 0, Args, NumArgs, AllArgs, 4195 CallType); 4196 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4197 ConvertedArgs.push_back(AllArgs[i]); 4198 return Invalid; 4199} 4200 4201/// CompareReferenceRelationship - Compare the two types T1 and T2 to 4202/// determine whether they are reference-related, 4203/// reference-compatible, reference-compatible with added 4204/// qualification, or incompatible, for use in C++ initialization by 4205/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 4206/// type, and the first type (T1) is the pointee type of the reference 4207/// type being initialized. 4208Sema::ReferenceCompareResult 4209Sema::CompareReferenceRelationship(SourceLocation Loc, 4210 QualType OrigT1, QualType OrigT2, 4211 bool& DerivedToBase) { 4212 assert(!OrigT1->isReferenceType() && 4213 "T1 must be the pointee type of the reference type"); 4214 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 4215 4216 QualType T1 = Context.getCanonicalType(OrigT1); 4217 QualType T2 = Context.getCanonicalType(OrigT2); 4218 QualType UnqualT1 = T1.getLocalUnqualifiedType(); 4219 QualType UnqualT2 = T2.getLocalUnqualifiedType(); 4220 4221 // C++ [dcl.init.ref]p4: 4222 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 4223 // reference-related to "cv2 T2" if T1 is the same type as T2, or 4224 // T1 is a base class of T2. 4225 if (UnqualT1 == UnqualT2) 4226 DerivedToBase = false; 4227 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 4228 !RequireCompleteType(Loc, OrigT2, PDiag()) && 4229 IsDerivedFrom(UnqualT2, UnqualT1)) 4230 DerivedToBase = true; 4231 else 4232 return Ref_Incompatible; 4233 4234 // At this point, we know that T1 and T2 are reference-related (at 4235 // least). 4236 4237 // C++ [dcl.init.ref]p4: 4238 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 4239 // reference-related to T2 and cv1 is the same cv-qualification 4240 // as, or greater cv-qualification than, cv2. For purposes of 4241 // overload resolution, cases for which cv1 is greater 4242 // cv-qualification than cv2 are identified as 4243 // reference-compatible with added qualification (see 13.3.3.2). 4244 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 4245 return Ref_Compatible; 4246 else if (T1.isMoreQualifiedThan(T2)) 4247 return Ref_Compatible_With_Added_Qualification; 4248 else 4249 return Ref_Related; 4250} 4251 4252/// CheckReferenceInit - Check the initialization of a reference 4253/// variable with the given initializer (C++ [dcl.init.ref]). Init is 4254/// the initializer (either a simple initializer or an initializer 4255/// list), and DeclType is the type of the declaration. When ICS is 4256/// non-null, this routine will compute the implicit conversion 4257/// sequence according to C++ [over.ics.ref] and will not produce any 4258/// diagnostics; when ICS is null, it will emit diagnostics when any 4259/// errors are found. Either way, a return value of true indicates 4260/// that there was a failure, a return value of false indicates that 4261/// the reference initialization succeeded. 4262/// 4263/// When @p SuppressUserConversions, user-defined conversions are 4264/// suppressed. 4265/// When @p AllowExplicit, we also permit explicit user-defined 4266/// conversion functions. 4267/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 4268/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 4269/// This is used when this is called from a C-style cast. 4270bool 4271Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 4272 SourceLocation DeclLoc, 4273 bool SuppressUserConversions, 4274 bool AllowExplicit, bool ForceRValue, 4275 ImplicitConversionSequence *ICS, 4276 bool IgnoreBaseAccess) { 4277 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 4278 4279 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 4280 QualType T2 = Init->getType(); 4281 4282 // If the initializer is the address of an overloaded function, try 4283 // to resolve the overloaded function. If all goes well, T2 is the 4284 // type of the resulting function. 4285 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 4286 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 4287 ICS != 0); 4288 if (Fn) { 4289 // Since we're performing this reference-initialization for 4290 // real, update the initializer with the resulting function. 4291 if (!ICS) { 4292 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 4293 return true; 4294 4295 Init = FixOverloadedFunctionReference(Init, Fn); 4296 } 4297 4298 T2 = Fn->getType(); 4299 } 4300 } 4301 4302 // Compute some basic properties of the types and the initializer. 4303 bool isRValRef = DeclType->isRValueReferenceType(); 4304 bool DerivedToBase = false; 4305 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 4306 Init->isLvalue(Context); 4307 ReferenceCompareResult RefRelationship 4308 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 4309 4310 // Most paths end in a failed conversion. 4311 if (ICS) 4312 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 4313 4314 // C++ [dcl.init.ref]p5: 4315 // A reference to type "cv1 T1" is initialized by an expression 4316 // of type "cv2 T2" as follows: 4317 4318 // -- If the initializer expression 4319 4320 // Rvalue references cannot bind to lvalues (N2812). 4321 // There is absolutely no situation where they can. In particular, note that 4322 // this is ill-formed, even if B has a user-defined conversion to A&&: 4323 // B b; 4324 // A&& r = b; 4325 if (isRValRef && InitLvalue == Expr::LV_Valid) { 4326 if (!ICS) 4327 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4328 << Init->getSourceRange(); 4329 return true; 4330 } 4331 4332 bool BindsDirectly = false; 4333 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 4334 // reference-compatible with "cv2 T2," or 4335 // 4336 // Note that the bit-field check is skipped if we are just computing 4337 // the implicit conversion sequence (C++ [over.best.ics]p2). 4338 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 4339 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4340 BindsDirectly = true; 4341 4342 if (ICS) { 4343 // C++ [over.ics.ref]p1: 4344 // When a parameter of reference type binds directly (8.5.3) 4345 // to an argument expression, the implicit conversion sequence 4346 // is the identity conversion, unless the argument expression 4347 // has a type that is a derived class of the parameter type, 4348 // in which case the implicit conversion sequence is a 4349 // derived-to-base Conversion (13.3.3.1). 4350 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 4351 ICS->Standard.First = ICK_Identity; 4352 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4353 ICS->Standard.Third = ICK_Identity; 4354 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4355 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 4356 ICS->Standard.ReferenceBinding = true; 4357 ICS->Standard.DirectBinding = true; 4358 ICS->Standard.RRefBinding = false; 4359 ICS->Standard.CopyConstructor = 0; 4360 4361 // Nothing more to do: the inaccessibility/ambiguity check for 4362 // derived-to-base conversions is suppressed when we're 4363 // computing the implicit conversion sequence (C++ 4364 // [over.best.ics]p2). 4365 return false; 4366 } else { 4367 // Perform the conversion. 4368 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4369 if (DerivedToBase) 4370 CK = CastExpr::CK_DerivedToBase; 4371 else if(CheckExceptionSpecCompatibility(Init, T1)) 4372 return true; 4373 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 4374 } 4375 } 4376 4377 // -- has a class type (i.e., T2 is a class type) and can be 4378 // implicitly converted to an lvalue of type "cv3 T3," 4379 // where "cv1 T1" is reference-compatible with "cv3 T3" 4380 // 92) (this conversion is selected by enumerating the 4381 // applicable conversion functions (13.3.1.6) and choosing 4382 // the best one through overload resolution (13.3)), 4383 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 4384 !RequireCompleteType(DeclLoc, T2, 0)) { 4385 CXXRecordDecl *T2RecordDecl 4386 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 4387 4388 OverloadCandidateSet CandidateSet; 4389 const UnresolvedSet *Conversions 4390 = T2RecordDecl->getVisibleConversionFunctions(); 4391 for (UnresolvedSet::iterator I = Conversions->begin(), 4392 E = Conversions->end(); I != E; ++I) { 4393 NamedDecl *D = *I; 4394 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); 4395 if (isa<UsingShadowDecl>(D)) 4396 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 4397 4398 FunctionTemplateDecl *ConvTemplate 4399 = dyn_cast<FunctionTemplateDecl>(D); 4400 CXXConversionDecl *Conv; 4401 if (ConvTemplate) 4402 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 4403 else 4404 Conv = cast<CXXConversionDecl>(D); 4405 4406 // If the conversion function doesn't return a reference type, 4407 // it can't be considered for this conversion. 4408 if (Conv->getConversionType()->isLValueReferenceType() && 4409 (AllowExplicit || !Conv->isExplicit())) { 4410 if (ConvTemplate) 4411 AddTemplateConversionCandidate(ConvTemplate, ActingDC, 4412 Init, DeclType, CandidateSet); 4413 else 4414 AddConversionCandidate(Conv, ActingDC, Init, DeclType, CandidateSet); 4415 } 4416 } 4417 4418 OverloadCandidateSet::iterator Best; 4419 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 4420 case OR_Success: 4421 // This is a direct binding. 4422 BindsDirectly = true; 4423 4424 if (ICS) { 4425 // C++ [over.ics.ref]p1: 4426 // 4427 // [...] If the parameter binds directly to the result of 4428 // applying a conversion function to the argument 4429 // expression, the implicit conversion sequence is a 4430 // user-defined conversion sequence (13.3.3.1.2), with the 4431 // second standard conversion sequence either an identity 4432 // conversion or, if the conversion function returns an 4433 // entity of a type that is a derived class of the parameter 4434 // type, a derived-to-base Conversion. 4435 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 4436 ICS->UserDefined.Before = Best->Conversions[0].Standard; 4437 ICS->UserDefined.After = Best->FinalConversion; 4438 ICS->UserDefined.ConversionFunction = Best->Function; 4439 ICS->UserDefined.EllipsisConversion = false; 4440 assert(ICS->UserDefined.After.ReferenceBinding && 4441 ICS->UserDefined.After.DirectBinding && 4442 "Expected a direct reference binding!"); 4443 return false; 4444 } else { 4445 OwningExprResult InitConversion = 4446 BuildCXXCastArgument(DeclLoc, QualType(), 4447 CastExpr::CK_UserDefinedConversion, 4448 cast<CXXMethodDecl>(Best->Function), 4449 Owned(Init)); 4450 Init = InitConversion.takeAs<Expr>(); 4451 4452 if (CheckExceptionSpecCompatibility(Init, T1)) 4453 return true; 4454 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 4455 /*isLvalue=*/true); 4456 } 4457 break; 4458 4459 case OR_Ambiguous: 4460 if (ICS) { 4461 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 4462 Cand != CandidateSet.end(); ++Cand) 4463 if (Cand->Viable) 4464 ICS->ConversionFunctionSet.push_back(Cand->Function); 4465 break; 4466 } 4467 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 4468 << Init->getSourceRange(); 4469 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 4470 return true; 4471 4472 case OR_No_Viable_Function: 4473 case OR_Deleted: 4474 // There was no suitable conversion, or we found a deleted 4475 // conversion; continue with other checks. 4476 break; 4477 } 4478 } 4479 4480 if (BindsDirectly) { 4481 // C++ [dcl.init.ref]p4: 4482 // [...] In all cases where the reference-related or 4483 // reference-compatible relationship of two types is used to 4484 // establish the validity of a reference binding, and T1 is a 4485 // base class of T2, a program that necessitates such a binding 4486 // is ill-formed if T1 is an inaccessible (clause 11) or 4487 // ambiguous (10.2) base class of T2. 4488 // 4489 // Note that we only check this condition when we're allowed to 4490 // complain about errors, because we should not be checking for 4491 // ambiguity (or inaccessibility) unless the reference binding 4492 // actually happens. 4493 if (DerivedToBase) 4494 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 4495 Init->getSourceRange(), 4496 IgnoreBaseAccess); 4497 else 4498 return false; 4499 } 4500 4501 // -- Otherwise, the reference shall be to a non-volatile const 4502 // type (i.e., cv1 shall be const), or the reference shall be an 4503 // rvalue reference and the initializer expression shall be an rvalue. 4504 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4505 if (!ICS) 4506 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4507 << T1 << int(InitLvalue != Expr::LV_Valid) 4508 << T2 << Init->getSourceRange(); 4509 return true; 4510 } 4511 4512 // -- If the initializer expression is an rvalue, with T2 a 4513 // class type, and "cv1 T1" is reference-compatible with 4514 // "cv2 T2," the reference is bound in one of the 4515 // following ways (the choice is implementation-defined): 4516 // 4517 // -- The reference is bound to the object represented by 4518 // the rvalue (see 3.10) or to a sub-object within that 4519 // object. 4520 // 4521 // -- A temporary of type "cv1 T2" [sic] is created, and 4522 // a constructor is called to copy the entire rvalue 4523 // object into the temporary. The reference is bound to 4524 // the temporary or to a sub-object within the 4525 // temporary. 4526 // 4527 // The constructor that would be used to make the copy 4528 // shall be callable whether or not the copy is actually 4529 // done. 4530 // 4531 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4532 // freedom, so we will always take the first option and never build 4533 // a temporary in this case. FIXME: We will, however, have to check 4534 // for the presence of a copy constructor in C++98/03 mode. 4535 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4536 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4537 if (ICS) { 4538 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 4539 ICS->Standard.First = ICK_Identity; 4540 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4541 ICS->Standard.Third = ICK_Identity; 4542 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4543 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 4544 ICS->Standard.ReferenceBinding = true; 4545 ICS->Standard.DirectBinding = false; 4546 ICS->Standard.RRefBinding = isRValRef; 4547 ICS->Standard.CopyConstructor = 0; 4548 } else { 4549 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4550 if (DerivedToBase) 4551 CK = CastExpr::CK_DerivedToBase; 4552 else if(CheckExceptionSpecCompatibility(Init, T1)) 4553 return true; 4554 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4555 } 4556 return false; 4557 } 4558 4559 // -- Otherwise, a temporary of type "cv1 T1" is created and 4560 // initialized from the initializer expression using the 4561 // rules for a non-reference copy initialization (8.5). The 4562 // reference is then bound to the temporary. If T1 is 4563 // reference-related to T2, cv1 must be the same 4564 // cv-qualification as, or greater cv-qualification than, 4565 // cv2; otherwise, the program is ill-formed. 4566 if (RefRelationship == Ref_Related) { 4567 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4568 // we would be reference-compatible or reference-compatible with 4569 // added qualification. But that wasn't the case, so the reference 4570 // initialization fails. 4571 if (!ICS) 4572 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4573 << T1 << int(InitLvalue != Expr::LV_Valid) 4574 << T2 << Init->getSourceRange(); 4575 return true; 4576 } 4577 4578 // If at least one of the types is a class type, the types are not 4579 // related, and we aren't allowed any user conversions, the 4580 // reference binding fails. This case is important for breaking 4581 // recursion, since TryImplicitConversion below will attempt to 4582 // create a temporary through the use of a copy constructor. 4583 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4584 (T1->isRecordType() || T2->isRecordType())) { 4585 if (!ICS) 4586 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4587 << DeclType << Init->getType() << AA_Initializing << Init->getSourceRange(); 4588 return true; 4589 } 4590 4591 // Actually try to convert the initializer to T1. 4592 if (ICS) { 4593 // C++ [over.ics.ref]p2: 4594 // 4595 // When a parameter of reference type is not bound directly to 4596 // an argument expression, the conversion sequence is the one 4597 // required to convert the argument expression to the 4598 // underlying type of the reference according to 4599 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4600 // to copy-initializing a temporary of the underlying type with 4601 // the argument expression. Any difference in top-level 4602 // cv-qualification is subsumed by the initialization itself 4603 // and does not constitute a conversion. 4604 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4605 /*AllowExplicit=*/false, 4606 /*ForceRValue=*/false, 4607 /*InOverloadResolution=*/false); 4608 4609 // Of course, that's still a reference binding. 4610 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 4611 ICS->Standard.ReferenceBinding = true; 4612 ICS->Standard.RRefBinding = isRValRef; 4613 } else if (ICS->ConversionKind == 4614 ImplicitConversionSequence::UserDefinedConversion) { 4615 ICS->UserDefined.After.ReferenceBinding = true; 4616 ICS->UserDefined.After.RRefBinding = isRValRef; 4617 } 4618 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 4619 } else { 4620 ImplicitConversionSequence Conversions; 4621 bool badConversion = PerformImplicitConversion(Init, T1, AA_Initializing, 4622 false, false, 4623 Conversions); 4624 if (badConversion) { 4625 if ((Conversions.ConversionKind == 4626 ImplicitConversionSequence::BadConversion) 4627 && !Conversions.ConversionFunctionSet.empty()) { 4628 Diag(DeclLoc, 4629 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4630 for (int j = Conversions.ConversionFunctionSet.size()-1; 4631 j >= 0; j--) { 4632 FunctionDecl *Func = Conversions.ConversionFunctionSet[j]; 4633 Diag(Func->getLocation(), diag::err_ovl_candidate); 4634 } 4635 } 4636 else { 4637 if (isRValRef) 4638 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4639 << Init->getSourceRange(); 4640 else 4641 Diag(DeclLoc, diag::err_invalid_initialization) 4642 << DeclType << Init->getType() << Init->getSourceRange(); 4643 } 4644 } 4645 return badConversion; 4646 } 4647} 4648 4649static inline bool 4650CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4651 const FunctionDecl *FnDecl) { 4652 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4653 if (isa<NamespaceDecl>(DC)) { 4654 return SemaRef.Diag(FnDecl->getLocation(), 4655 diag::err_operator_new_delete_declared_in_namespace) 4656 << FnDecl->getDeclName(); 4657 } 4658 4659 if (isa<TranslationUnitDecl>(DC) && 4660 FnDecl->getStorageClass() == FunctionDecl::Static) { 4661 return SemaRef.Diag(FnDecl->getLocation(), 4662 diag::err_operator_new_delete_declared_static) 4663 << FnDecl->getDeclName(); 4664 } 4665 4666 return false; 4667} 4668 4669static inline bool 4670CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4671 CanQualType ExpectedResultType, 4672 CanQualType ExpectedFirstParamType, 4673 unsigned DependentParamTypeDiag, 4674 unsigned InvalidParamTypeDiag) { 4675 QualType ResultType = 4676 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4677 4678 // Check that the result type is not dependent. 4679 if (ResultType->isDependentType()) 4680 return SemaRef.Diag(FnDecl->getLocation(), 4681 diag::err_operator_new_delete_dependent_result_type) 4682 << FnDecl->getDeclName() << ExpectedResultType; 4683 4684 // Check that the result type is what we expect. 4685 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4686 return SemaRef.Diag(FnDecl->getLocation(), 4687 diag::err_operator_new_delete_invalid_result_type) 4688 << FnDecl->getDeclName() << ExpectedResultType; 4689 4690 // A function template must have at least 2 parameters. 4691 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4692 return SemaRef.Diag(FnDecl->getLocation(), 4693 diag::err_operator_new_delete_template_too_few_parameters) 4694 << FnDecl->getDeclName(); 4695 4696 // The function decl must have at least 1 parameter. 4697 if (FnDecl->getNumParams() == 0) 4698 return SemaRef.Diag(FnDecl->getLocation(), 4699 diag::err_operator_new_delete_too_few_parameters) 4700 << FnDecl->getDeclName(); 4701 4702 // Check the the first parameter type is not dependent. 4703 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4704 if (FirstParamType->isDependentType()) 4705 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4706 << FnDecl->getDeclName() << ExpectedFirstParamType; 4707 4708 // Check that the first parameter type is what we expect. 4709 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4710 ExpectedFirstParamType) 4711 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4712 << FnDecl->getDeclName() << ExpectedFirstParamType; 4713 4714 return false; 4715} 4716 4717static bool 4718CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4719 // C++ [basic.stc.dynamic.allocation]p1: 4720 // A program is ill-formed if an allocation function is declared in a 4721 // namespace scope other than global scope or declared static in global 4722 // scope. 4723 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4724 return true; 4725 4726 CanQualType SizeTy = 4727 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4728 4729 // C++ [basic.stc.dynamic.allocation]p1: 4730 // The return type shall be void*. The first parameter shall have type 4731 // std::size_t. 4732 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4733 SizeTy, 4734 diag::err_operator_new_dependent_param_type, 4735 diag::err_operator_new_param_type)) 4736 return true; 4737 4738 // C++ [basic.stc.dynamic.allocation]p1: 4739 // The first parameter shall not have an associated default argument. 4740 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4741 return SemaRef.Diag(FnDecl->getLocation(), 4742 diag::err_operator_new_default_arg) 4743 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4744 4745 return false; 4746} 4747 4748static bool 4749CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4750 // C++ [basic.stc.dynamic.deallocation]p1: 4751 // A program is ill-formed if deallocation functions are declared in a 4752 // namespace scope other than global scope or declared static in global 4753 // scope. 4754 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4755 return true; 4756 4757 // C++ [basic.stc.dynamic.deallocation]p2: 4758 // Each deallocation function shall return void and its first parameter 4759 // shall be void*. 4760 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4761 SemaRef.Context.VoidPtrTy, 4762 diag::err_operator_delete_dependent_param_type, 4763 diag::err_operator_delete_param_type)) 4764 return true; 4765 4766 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4767 if (FirstParamType->isDependentType()) 4768 return SemaRef.Diag(FnDecl->getLocation(), 4769 diag::err_operator_delete_dependent_param_type) 4770 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4771 4772 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4773 SemaRef.Context.VoidPtrTy) 4774 return SemaRef.Diag(FnDecl->getLocation(), 4775 diag::err_operator_delete_param_type) 4776 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4777 4778 return false; 4779} 4780 4781/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4782/// of this overloaded operator is well-formed. If so, returns false; 4783/// otherwise, emits appropriate diagnostics and returns true. 4784bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4785 assert(FnDecl && FnDecl->isOverloadedOperator() && 4786 "Expected an overloaded operator declaration"); 4787 4788 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4789 4790 // C++ [over.oper]p5: 4791 // The allocation and deallocation functions, operator new, 4792 // operator new[], operator delete and operator delete[], are 4793 // described completely in 3.7.3. The attributes and restrictions 4794 // found in the rest of this subclause do not apply to them unless 4795 // explicitly stated in 3.7.3. 4796 if (Op == OO_Delete || Op == OO_Array_Delete) 4797 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4798 4799 if (Op == OO_New || Op == OO_Array_New) 4800 return CheckOperatorNewDeclaration(*this, FnDecl); 4801 4802 // C++ [over.oper]p6: 4803 // An operator function shall either be a non-static member 4804 // function or be a non-member function and have at least one 4805 // parameter whose type is a class, a reference to a class, an 4806 // enumeration, or a reference to an enumeration. 4807 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4808 if (MethodDecl->isStatic()) 4809 return Diag(FnDecl->getLocation(), 4810 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4811 } else { 4812 bool ClassOrEnumParam = false; 4813 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4814 ParamEnd = FnDecl->param_end(); 4815 Param != ParamEnd; ++Param) { 4816 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4817 if (ParamType->isDependentType() || ParamType->isRecordType() || 4818 ParamType->isEnumeralType()) { 4819 ClassOrEnumParam = true; 4820 break; 4821 } 4822 } 4823 4824 if (!ClassOrEnumParam) 4825 return Diag(FnDecl->getLocation(), 4826 diag::err_operator_overload_needs_class_or_enum) 4827 << FnDecl->getDeclName(); 4828 } 4829 4830 // C++ [over.oper]p8: 4831 // An operator function cannot have default arguments (8.3.6), 4832 // except where explicitly stated below. 4833 // 4834 // Only the function-call operator allows default arguments 4835 // (C++ [over.call]p1). 4836 if (Op != OO_Call) { 4837 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4838 Param != FnDecl->param_end(); ++Param) { 4839 if ((*Param)->hasDefaultArg()) 4840 return Diag((*Param)->getLocation(), 4841 diag::err_operator_overload_default_arg) 4842 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4843 } 4844 } 4845 4846 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4847 { false, false, false } 4848#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4849 , { Unary, Binary, MemberOnly } 4850#include "clang/Basic/OperatorKinds.def" 4851 }; 4852 4853 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4854 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4855 bool MustBeMemberOperator = OperatorUses[Op][2]; 4856 4857 // C++ [over.oper]p8: 4858 // [...] Operator functions cannot have more or fewer parameters 4859 // than the number required for the corresponding operator, as 4860 // described in the rest of this subclause. 4861 unsigned NumParams = FnDecl->getNumParams() 4862 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4863 if (Op != OO_Call && 4864 ((NumParams == 1 && !CanBeUnaryOperator) || 4865 (NumParams == 2 && !CanBeBinaryOperator) || 4866 (NumParams < 1) || (NumParams > 2))) { 4867 // We have the wrong number of parameters. 4868 unsigned ErrorKind; 4869 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4870 ErrorKind = 2; // 2 -> unary or binary. 4871 } else if (CanBeUnaryOperator) { 4872 ErrorKind = 0; // 0 -> unary 4873 } else { 4874 assert(CanBeBinaryOperator && 4875 "All non-call overloaded operators are unary or binary!"); 4876 ErrorKind = 1; // 1 -> binary 4877 } 4878 4879 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4880 << FnDecl->getDeclName() << NumParams << ErrorKind; 4881 } 4882 4883 // Overloaded operators other than operator() cannot be variadic. 4884 if (Op != OO_Call && 4885 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4886 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4887 << FnDecl->getDeclName(); 4888 } 4889 4890 // Some operators must be non-static member functions. 4891 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4892 return Diag(FnDecl->getLocation(), 4893 diag::err_operator_overload_must_be_member) 4894 << FnDecl->getDeclName(); 4895 } 4896 4897 // C++ [over.inc]p1: 4898 // The user-defined function called operator++ implements the 4899 // prefix and postfix ++ operator. If this function is a member 4900 // function with no parameters, or a non-member function with one 4901 // parameter of class or enumeration type, it defines the prefix 4902 // increment operator ++ for objects of that type. If the function 4903 // is a member function with one parameter (which shall be of type 4904 // int) or a non-member function with two parameters (the second 4905 // of which shall be of type int), it defines the postfix 4906 // increment operator ++ for objects of that type. 4907 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4908 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4909 bool ParamIsInt = false; 4910 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4911 ParamIsInt = BT->getKind() == BuiltinType::Int; 4912 4913 if (!ParamIsInt) 4914 return Diag(LastParam->getLocation(), 4915 diag::err_operator_overload_post_incdec_must_be_int) 4916 << LastParam->getType() << (Op == OO_MinusMinus); 4917 } 4918 4919 // Notify the class if it got an assignment operator. 4920 if (Op == OO_Equal) { 4921 // Would have returned earlier otherwise. 4922 assert(isa<CXXMethodDecl>(FnDecl) && 4923 "Overloaded = not member, but not filtered."); 4924 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 4925 Method->getParent()->addedAssignmentOperator(Context, Method); 4926 } 4927 4928 return false; 4929} 4930 4931/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 4932/// linkage specification, including the language and (if present) 4933/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 4934/// the location of the language string literal, which is provided 4935/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 4936/// the '{' brace. Otherwise, this linkage specification does not 4937/// have any braces. 4938Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 4939 SourceLocation ExternLoc, 4940 SourceLocation LangLoc, 4941 const char *Lang, 4942 unsigned StrSize, 4943 SourceLocation LBraceLoc) { 4944 LinkageSpecDecl::LanguageIDs Language; 4945 if (strncmp(Lang, "\"C\"", StrSize) == 0) 4946 Language = LinkageSpecDecl::lang_c; 4947 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 4948 Language = LinkageSpecDecl::lang_cxx; 4949 else { 4950 Diag(LangLoc, diag::err_bad_language); 4951 return DeclPtrTy(); 4952 } 4953 4954 // FIXME: Add all the various semantics of linkage specifications 4955 4956 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 4957 LangLoc, Language, 4958 LBraceLoc.isValid()); 4959 CurContext->addDecl(D); 4960 PushDeclContext(S, D); 4961 return DeclPtrTy::make(D); 4962} 4963 4964/// ActOnFinishLinkageSpecification - Completely the definition of 4965/// the C++ linkage specification LinkageSpec. If RBraceLoc is 4966/// valid, it's the position of the closing '}' brace in a linkage 4967/// specification that uses braces. 4968Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 4969 DeclPtrTy LinkageSpec, 4970 SourceLocation RBraceLoc) { 4971 if (LinkageSpec) 4972 PopDeclContext(); 4973 return LinkageSpec; 4974} 4975 4976/// \brief Perform semantic analysis for the variable declaration that 4977/// occurs within a C++ catch clause, returning the newly-created 4978/// variable. 4979VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 4980 TypeSourceInfo *TInfo, 4981 IdentifierInfo *Name, 4982 SourceLocation Loc, 4983 SourceRange Range) { 4984 bool Invalid = false; 4985 4986 // Arrays and functions decay. 4987 if (ExDeclType->isArrayType()) 4988 ExDeclType = Context.getArrayDecayedType(ExDeclType); 4989 else if (ExDeclType->isFunctionType()) 4990 ExDeclType = Context.getPointerType(ExDeclType); 4991 4992 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 4993 // The exception-declaration shall not denote a pointer or reference to an 4994 // incomplete type, other than [cv] void*. 4995 // N2844 forbids rvalue references. 4996 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 4997 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 4998 Invalid = true; 4999 } 5000 5001 QualType BaseType = ExDeclType; 5002 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5003 unsigned DK = diag::err_catch_incomplete; 5004 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5005 BaseType = Ptr->getPointeeType(); 5006 Mode = 1; 5007 DK = diag::err_catch_incomplete_ptr; 5008 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5009 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5010 BaseType = Ref->getPointeeType(); 5011 Mode = 2; 5012 DK = diag::err_catch_incomplete_ref; 5013 } 5014 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5015 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 5016 Invalid = true; 5017 5018 if (!Invalid && !ExDeclType->isDependentType() && 5019 RequireNonAbstractType(Loc, ExDeclType, 5020 diag::err_abstract_type_in_decl, 5021 AbstractVariableType)) 5022 Invalid = true; 5023 5024 // FIXME: Need to test for ability to copy-construct and destroy the 5025 // exception variable. 5026 5027 // FIXME: Need to check for abstract classes. 5028 5029 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5030 Name, ExDeclType, TInfo, VarDecl::None); 5031 5032 if (Invalid) 5033 ExDecl->setInvalidDecl(); 5034 5035 return ExDecl; 5036} 5037 5038/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5039/// handler. 5040Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5041 TypeSourceInfo *TInfo = 0; 5042 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5043 5044 bool Invalid = D.isInvalidType(); 5045 IdentifierInfo *II = D.getIdentifier(); 5046 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 5047 // The scope should be freshly made just for us. There is just no way 5048 // it contains any previous declaration. 5049 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5050 if (PrevDecl->isTemplateParameter()) { 5051 // Maybe we will complain about the shadowed template parameter. 5052 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5053 } 5054 } 5055 5056 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5057 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5058 << D.getCXXScopeSpec().getRange(); 5059 Invalid = true; 5060 } 5061 5062 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5063 D.getIdentifier(), 5064 D.getIdentifierLoc(), 5065 D.getDeclSpec().getSourceRange()); 5066 5067 if (Invalid) 5068 ExDecl->setInvalidDecl(); 5069 5070 // Add the exception declaration into this scope. 5071 if (II) 5072 PushOnScopeChains(ExDecl, S); 5073 else 5074 CurContext->addDecl(ExDecl); 5075 5076 ProcessDeclAttributes(S, ExDecl, D); 5077 return DeclPtrTy::make(ExDecl); 5078} 5079 5080Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5081 ExprArg assertexpr, 5082 ExprArg assertmessageexpr) { 5083 Expr *AssertExpr = (Expr *)assertexpr.get(); 5084 StringLiteral *AssertMessage = 5085 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5086 5087 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5088 llvm::APSInt Value(32); 5089 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5090 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5091 AssertExpr->getSourceRange(); 5092 return DeclPtrTy(); 5093 } 5094 5095 if (Value == 0) { 5096 Diag(AssertLoc, diag::err_static_assert_failed) 5097 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5098 } 5099 } 5100 5101 assertexpr.release(); 5102 assertmessageexpr.release(); 5103 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5104 AssertExpr, AssertMessage); 5105 5106 CurContext->addDecl(Decl); 5107 return DeclPtrTy::make(Decl); 5108} 5109 5110/// Handle a friend type declaration. This works in tandem with 5111/// ActOnTag. 5112/// 5113/// Notes on friend class templates: 5114/// 5115/// We generally treat friend class declarations as if they were 5116/// declaring a class. So, for example, the elaborated type specifier 5117/// in a friend declaration is required to obey the restrictions of a 5118/// class-head (i.e. no typedefs in the scope chain), template 5119/// parameters are required to match up with simple template-ids, &c. 5120/// However, unlike when declaring a template specialization, it's 5121/// okay to refer to a template specialization without an empty 5122/// template parameter declaration, e.g. 5123/// friend class A<T>::B<unsigned>; 5124/// We permit this as a special case; if there are any template 5125/// parameters present at all, require proper matching, i.e. 5126/// template <> template <class T> friend class A<int>::B; 5127Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5128 MultiTemplateParamsArg TempParams) { 5129 SourceLocation Loc = DS.getSourceRange().getBegin(); 5130 5131 assert(DS.isFriendSpecified()); 5132 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5133 5134 // Try to convert the decl specifier to a type. This works for 5135 // friend templates because ActOnTag never produces a ClassTemplateDecl 5136 // for a TUK_Friend. 5137 Declarator TheDeclarator(DS, Declarator::MemberContext); 5138 QualType T = GetTypeForDeclarator(TheDeclarator, S); 5139 if (TheDeclarator.isInvalidType()) 5140 return DeclPtrTy(); 5141 5142 // This is definitely an error in C++98. It's probably meant to 5143 // be forbidden in C++0x, too, but the specification is just 5144 // poorly written. 5145 // 5146 // The problem is with declarations like the following: 5147 // template <T> friend A<T>::foo; 5148 // where deciding whether a class C is a friend or not now hinges 5149 // on whether there exists an instantiation of A that causes 5150 // 'foo' to equal C. There are restrictions on class-heads 5151 // (which we declare (by fiat) elaborated friend declarations to 5152 // be) that makes this tractable. 5153 // 5154 // FIXME: handle "template <> friend class A<T>;", which 5155 // is possibly well-formed? Who even knows? 5156 if (TempParams.size() && !isa<ElaboratedType>(T)) { 5157 Diag(Loc, diag::err_tagless_friend_type_template) 5158 << DS.getSourceRange(); 5159 return DeclPtrTy(); 5160 } 5161 5162 // C++ [class.friend]p2: 5163 // An elaborated-type-specifier shall be used in a friend declaration 5164 // for a class.* 5165 // * The class-key of the elaborated-type-specifier is required. 5166 // This is one of the rare places in Clang where it's legitimate to 5167 // ask about the "spelling" of the type. 5168 if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) { 5169 // If we evaluated the type to a record type, suggest putting 5170 // a tag in front. 5171 if (const RecordType *RT = T->getAs<RecordType>()) { 5172 RecordDecl *RD = RT->getDecl(); 5173 5174 std::string InsertionText = std::string(" ") + RD->getKindName(); 5175 5176 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 5177 << (unsigned) RD->getTagKind() 5178 << T 5179 << SourceRange(DS.getFriendSpecLoc()) 5180 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 5181 InsertionText); 5182 return DeclPtrTy(); 5183 }else { 5184 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 5185 << DS.getSourceRange(); 5186 return DeclPtrTy(); 5187 } 5188 } 5189 5190 // Enum types cannot be friends. 5191 if (T->getAs<EnumType>()) { 5192 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 5193 << SourceRange(DS.getFriendSpecLoc()); 5194 return DeclPtrTy(); 5195 } 5196 5197 // C++98 [class.friend]p1: A friend of a class is a function 5198 // or class that is not a member of the class . . . 5199 // This is fixed in DR77, which just barely didn't make the C++03 5200 // deadline. It's also a very silly restriction that seriously 5201 // affects inner classes and which nobody else seems to implement; 5202 // thus we never diagnose it, not even in -pedantic. 5203 5204 Decl *D; 5205 if (TempParams.size()) 5206 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5207 TempParams.size(), 5208 (TemplateParameterList**) TempParams.release(), 5209 T.getTypePtr(), 5210 DS.getFriendSpecLoc()); 5211 else 5212 D = FriendDecl::Create(Context, CurContext, Loc, T.getTypePtr(), 5213 DS.getFriendSpecLoc()); 5214 D->setAccess(AS_public); 5215 CurContext->addDecl(D); 5216 5217 return DeclPtrTy::make(D); 5218} 5219 5220Sema::DeclPtrTy 5221Sema::ActOnFriendFunctionDecl(Scope *S, 5222 Declarator &D, 5223 bool IsDefinition, 5224 MultiTemplateParamsArg TemplateParams) { 5225 const DeclSpec &DS = D.getDeclSpec(); 5226 5227 assert(DS.isFriendSpecified()); 5228 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5229 5230 SourceLocation Loc = D.getIdentifierLoc(); 5231 TypeSourceInfo *TInfo = 0; 5232 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5233 5234 // C++ [class.friend]p1 5235 // A friend of a class is a function or class.... 5236 // Note that this sees through typedefs, which is intended. 5237 // It *doesn't* see through dependent types, which is correct 5238 // according to [temp.arg.type]p3: 5239 // If a declaration acquires a function type through a 5240 // type dependent on a template-parameter and this causes 5241 // a declaration that does not use the syntactic form of a 5242 // function declarator to have a function type, the program 5243 // is ill-formed. 5244 if (!T->isFunctionType()) { 5245 Diag(Loc, diag::err_unexpected_friend); 5246 5247 // It might be worthwhile to try to recover by creating an 5248 // appropriate declaration. 5249 return DeclPtrTy(); 5250 } 5251 5252 // C++ [namespace.memdef]p3 5253 // - If a friend declaration in a non-local class first declares a 5254 // class or function, the friend class or function is a member 5255 // of the innermost enclosing namespace. 5256 // - The name of the friend is not found by simple name lookup 5257 // until a matching declaration is provided in that namespace 5258 // scope (either before or after the class declaration granting 5259 // friendship). 5260 // - If a friend function is called, its name may be found by the 5261 // name lookup that considers functions from namespaces and 5262 // classes associated with the types of the function arguments. 5263 // - When looking for a prior declaration of a class or a function 5264 // declared as a friend, scopes outside the innermost enclosing 5265 // namespace scope are not considered. 5266 5267 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5268 DeclarationName Name = GetNameForDeclarator(D); 5269 assert(Name); 5270 5271 // The context we found the declaration in, or in which we should 5272 // create the declaration. 5273 DeclContext *DC; 5274 5275 // FIXME: handle local classes 5276 5277 // Recover from invalid scope qualifiers as if they just weren't there. 5278 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5279 ForRedeclaration); 5280 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5281 // FIXME: RequireCompleteDeclContext 5282 DC = computeDeclContext(ScopeQual); 5283 5284 // FIXME: handle dependent contexts 5285 if (!DC) return DeclPtrTy(); 5286 5287 LookupQualifiedName(Previous, DC); 5288 5289 // If searching in that context implicitly found a declaration in 5290 // a different context, treat it like it wasn't found at all. 5291 // TODO: better diagnostics for this case. Suggesting the right 5292 // qualified scope would be nice... 5293 // FIXME: getRepresentativeDecl() is not right here at all 5294 if (Previous.empty() || 5295 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5296 D.setInvalidType(); 5297 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5298 return DeclPtrTy(); 5299 } 5300 5301 // C++ [class.friend]p1: A friend of a class is a function or 5302 // class that is not a member of the class . . . 5303 if (DC->Equals(CurContext)) 5304 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5305 5306 // Otherwise walk out to the nearest namespace scope looking for matches. 5307 } else { 5308 // TODO: handle local class contexts. 5309 5310 DC = CurContext; 5311 while (true) { 5312 // Skip class contexts. If someone can cite chapter and verse 5313 // for this behavior, that would be nice --- it's what GCC and 5314 // EDG do, and it seems like a reasonable intent, but the spec 5315 // really only says that checks for unqualified existing 5316 // declarations should stop at the nearest enclosing namespace, 5317 // not that they should only consider the nearest enclosing 5318 // namespace. 5319 while (DC->isRecord()) 5320 DC = DC->getParent(); 5321 5322 LookupQualifiedName(Previous, DC); 5323 5324 // TODO: decide what we think about using declarations. 5325 if (!Previous.empty()) 5326 break; 5327 5328 if (DC->isFileContext()) break; 5329 DC = DC->getParent(); 5330 } 5331 5332 // C++ [class.friend]p1: A friend of a class is a function or 5333 // class that is not a member of the class . . . 5334 // C++0x changes this for both friend types and functions. 5335 // Most C++ 98 compilers do seem to give an error here, so 5336 // we do, too. 5337 if (!Previous.empty() && DC->Equals(CurContext) 5338 && !getLangOptions().CPlusPlus0x) 5339 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5340 } 5341 5342 if (DC->isFileContext()) { 5343 // This implies that it has to be an operator or function. 5344 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5345 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5346 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5347 Diag(Loc, diag::err_introducing_special_friend) << 5348 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5349 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5350 return DeclPtrTy(); 5351 } 5352 } 5353 5354 bool Redeclaration = false; 5355 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5356 move(TemplateParams), 5357 IsDefinition, 5358 Redeclaration); 5359 if (!ND) return DeclPtrTy(); 5360 5361 assert(ND->getDeclContext() == DC); 5362 assert(ND->getLexicalDeclContext() == CurContext); 5363 5364 // Add the function declaration to the appropriate lookup tables, 5365 // adjusting the redeclarations list as necessary. We don't 5366 // want to do this yet if the friending class is dependent. 5367 // 5368 // Also update the scope-based lookup if the target context's 5369 // lookup context is in lexical scope. 5370 if (!CurContext->isDependentContext()) { 5371 DC = DC->getLookupContext(); 5372 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5373 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5374 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5375 } 5376 5377 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5378 D.getIdentifierLoc(), ND, 5379 DS.getFriendSpecLoc()); 5380 FrD->setAccess(AS_public); 5381 CurContext->addDecl(FrD); 5382 5383 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) 5384 FrD->setSpecialization(true); 5385 5386 return DeclPtrTy::make(ND); 5387} 5388 5389void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5390 AdjustDeclIfTemplate(dcl); 5391 5392 Decl *Dcl = dcl.getAs<Decl>(); 5393 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5394 if (!Fn) { 5395 Diag(DelLoc, diag::err_deleted_non_function); 5396 return; 5397 } 5398 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5399 Diag(DelLoc, diag::err_deleted_decl_not_first); 5400 Diag(Prev->getLocation(), diag::note_previous_declaration); 5401 // If the declaration wasn't the first, we delete the function anyway for 5402 // recovery. 5403 } 5404 Fn->setDeleted(); 5405} 5406 5407static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5408 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5409 ++CI) { 5410 Stmt *SubStmt = *CI; 5411 if (!SubStmt) 5412 continue; 5413 if (isa<ReturnStmt>(SubStmt)) 5414 Self.Diag(SubStmt->getSourceRange().getBegin(), 5415 diag::err_return_in_constructor_handler); 5416 if (!isa<Expr>(SubStmt)) 5417 SearchForReturnInStmt(Self, SubStmt); 5418 } 5419} 5420 5421void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5422 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5423 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5424 SearchForReturnInStmt(*this, Handler); 5425 } 5426} 5427 5428bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5429 const CXXMethodDecl *Old) { 5430 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5431 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5432 5433 QualType CNewTy = Context.getCanonicalType(NewTy); 5434 QualType COldTy = Context.getCanonicalType(OldTy); 5435 5436 if (CNewTy == COldTy && 5437 CNewTy.getLocalCVRQualifiers() == COldTy.getLocalCVRQualifiers()) 5438 return false; 5439 5440 // Check if the return types are covariant 5441 QualType NewClassTy, OldClassTy; 5442 5443 /// Both types must be pointers or references to classes. 5444 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 5445 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 5446 NewClassTy = NewPT->getPointeeType(); 5447 OldClassTy = OldPT->getPointeeType(); 5448 } 5449 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 5450 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 5451 NewClassTy = NewRT->getPointeeType(); 5452 OldClassTy = OldRT->getPointeeType(); 5453 } 5454 } 5455 5456 // The return types aren't either both pointers or references to a class type. 5457 if (NewClassTy.isNull()) { 5458 Diag(New->getLocation(), 5459 diag::err_different_return_type_for_overriding_virtual_function) 5460 << New->getDeclName() << NewTy << OldTy; 5461 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5462 5463 return true; 5464 } 5465 5466 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5467 // Check if the new class derives from the old class. 5468 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5469 Diag(New->getLocation(), 5470 diag::err_covariant_return_not_derived) 5471 << New->getDeclName() << NewTy << OldTy; 5472 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5473 return true; 5474 } 5475 5476 // Check if we the conversion from derived to base is valid. 5477 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5478 diag::err_covariant_return_inaccessible_base, 5479 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5480 // FIXME: Should this point to the return type? 5481 New->getLocation(), SourceRange(), New->getDeclName())) { 5482 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5483 return true; 5484 } 5485 } 5486 5487 // The qualifiers of the return types must be the same. 5488 if (CNewTy.getLocalCVRQualifiers() != COldTy.getLocalCVRQualifiers()) { 5489 Diag(New->getLocation(), 5490 diag::err_covariant_return_type_different_qualifications) 5491 << New->getDeclName() << NewTy << OldTy; 5492 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5493 return true; 5494 }; 5495 5496 5497 // The new class type must have the same or less qualifiers as the old type. 5498 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5499 Diag(New->getLocation(), 5500 diag::err_covariant_return_type_class_type_more_qualified) 5501 << New->getDeclName() << NewTy << OldTy; 5502 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5503 return true; 5504 }; 5505 5506 return false; 5507} 5508 5509bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5510 const CXXMethodDecl *Old) 5511{ 5512 if (Old->hasAttr<FinalAttr>()) { 5513 Diag(New->getLocation(), diag::err_final_function_overridden) 5514 << New->getDeclName(); 5515 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5516 return true; 5517 } 5518 5519 return false; 5520} 5521 5522/// \brief Mark the given method pure. 5523/// 5524/// \param Method the method to be marked pure. 5525/// 5526/// \param InitRange the source range that covers the "0" initializer. 5527bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5528 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5529 Method->setPure(); 5530 5531 // A class is abstract if at least one function is pure virtual. 5532 Method->getParent()->setAbstract(true); 5533 return false; 5534 } 5535 5536 if (!Method->isInvalidDecl()) 5537 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5538 << Method->getDeclName() << InitRange; 5539 return true; 5540} 5541 5542/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5543/// an initializer for the out-of-line declaration 'Dcl'. The scope 5544/// is a fresh scope pushed for just this purpose. 5545/// 5546/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5547/// static data member of class X, names should be looked up in the scope of 5548/// class X. 5549void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5550 // If there is no declaration, there was an error parsing it. 5551 Decl *D = Dcl.getAs<Decl>(); 5552 if (D == 0) return; 5553 5554 // We should only get called for declarations with scope specifiers, like: 5555 // int foo::bar; 5556 assert(D->isOutOfLine()); 5557 EnterDeclaratorContext(S, D->getDeclContext()); 5558} 5559 5560/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5561/// initializer for the out-of-line declaration 'Dcl'. 5562void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5563 // If there is no declaration, there was an error parsing it. 5564 Decl *D = Dcl.getAs<Decl>(); 5565 if (D == 0) return; 5566 5567 assert(D->isOutOfLine()); 5568 ExitDeclaratorContext(S); 5569} 5570 5571/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5572/// C++ if/switch/while/for statement. 5573/// e.g: "if (int x = f()) {...}" 5574Action::DeclResult 5575Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5576 // C++ 6.4p2: 5577 // The declarator shall not specify a function or an array. 5578 // The type-specifier-seq shall not contain typedef and shall not declare a 5579 // new class or enumeration. 5580 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5581 "Parser allowed 'typedef' as storage class of condition decl."); 5582 5583 TypeSourceInfo *TInfo = 0; 5584 TagDecl *OwnedTag = 0; 5585 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5586 5587 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5588 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5589 // would be created and CXXConditionDeclExpr wants a VarDecl. 5590 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5591 << D.getSourceRange(); 5592 return DeclResult(); 5593 } else if (OwnedTag && OwnedTag->isDefinition()) { 5594 // The type-specifier-seq shall not declare a new class or enumeration. 5595 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5596 } 5597 5598 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5599 if (!Dcl) 5600 return DeclResult(); 5601 5602 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5603 VD->setDeclaredInCondition(true); 5604 return Dcl; 5605} 5606 5607void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5608 CXXMethodDecl *MD) { 5609 // Ignore dependent types. 5610 if (MD->isDependentContext()) 5611 return; 5612 5613 CXXRecordDecl *RD = MD->getParent(); 5614 5615 // Ignore classes without a vtable. 5616 if (!RD->isDynamicClass()) 5617 return; 5618 5619 if (!MD->isOutOfLine()) { 5620 // The only inline functions we care about are constructors. We also defer 5621 // marking the virtual members as referenced until we've reached the end 5622 // of the translation unit. We do this because we need to know the key 5623 // function of the class in order to determine the key function. 5624 if (isa<CXXConstructorDecl>(MD)) 5625 ClassesWithUnmarkedVirtualMembers.insert(std::make_pair(RD, Loc)); 5626 return; 5627 } 5628 5629 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5630 5631 if (!KeyFunction) { 5632 // This record does not have a key function, so we assume that the vtable 5633 // will be emitted when it's used by the constructor. 5634 if (!isa<CXXConstructorDecl>(MD)) 5635 return; 5636 } else if (KeyFunction->getCanonicalDecl() != MD->getCanonicalDecl()) { 5637 // We don't have the right key function. 5638 return; 5639 } 5640 5641 // Mark the members as referenced. 5642 MarkVirtualMembersReferenced(Loc, RD); 5643 ClassesWithUnmarkedVirtualMembers.erase(RD); 5644} 5645 5646bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5647 if (ClassesWithUnmarkedVirtualMembers.empty()) 5648 return false; 5649 5650 for (std::map<CXXRecordDecl *, SourceLocation>::iterator i = 5651 ClassesWithUnmarkedVirtualMembers.begin(), 5652 e = ClassesWithUnmarkedVirtualMembers.end(); i != e; ++i) { 5653 CXXRecordDecl *RD = i->first; 5654 5655 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD); 5656 if (KeyFunction) { 5657 // We know that the class has a key function. If the key function was 5658 // declared in this translation unit, then it the class decl would not 5659 // have been in the ClassesWithUnmarkedVirtualMembers map. 5660 continue; 5661 } 5662 5663 SourceLocation Loc = i->second; 5664 MarkVirtualMembersReferenced(Loc, RD); 5665 } 5666 5667 ClassesWithUnmarkedVirtualMembers.clear(); 5668 return true; 5669} 5670 5671void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, CXXRecordDecl *RD) { 5672 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5673 e = RD->method_end(); i != e; ++i) { 5674 CXXMethodDecl *MD = *i; 5675 5676 // C++ [basic.def.odr]p2: 5677 // [...] A virtual member function is used if it is not pure. [...] 5678 if (MD->isVirtual() && !MD->isPure()) 5679 MarkDeclarationReferenced(Loc, MD); 5680 } 5681} 5682 5683