SemaDeclCXX.cpp revision 81201626aa08bcc9d05c8b3c6a1d38a7d577c3ce
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/RecordLayout.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/TypeLoc.h" 23#include "clang/AST/TypeOrdering.h" 24#include "clang/AST/StmtVisitor.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Parse/Template.h" 27#include "clang/Basic/PartialDiagnostic.h" 28#include "clang/Lex/Preprocessor.h" 29#include "llvm/ADT/STLExtras.h" 30#include <map> 31#include <set> 32 33using namespace clang; 34 35//===----------------------------------------------------------------------===// 36// CheckDefaultArgumentVisitor 37//===----------------------------------------------------------------------===// 38 39namespace { 40 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 41 /// the default argument of a parameter to determine whether it 42 /// contains any ill-formed subexpressions. For example, this will 43 /// diagnose the use of local variables or parameters within the 44 /// default argument expression. 45 class CheckDefaultArgumentVisitor 46 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 47 Expr *DefaultArg; 48 Sema *S; 49 50 public: 51 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 52 : DefaultArg(defarg), S(s) {} 53 54 bool VisitExpr(Expr *Node); 55 bool VisitDeclRefExpr(DeclRefExpr *DRE); 56 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 57 }; 58 59 /// VisitExpr - Visit all of the children of this expression. 60 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 61 bool IsInvalid = false; 62 for (Stmt::child_iterator I = Node->child_begin(), 63 E = Node->child_end(); I != E; ++I) 64 IsInvalid |= Visit(*I); 65 return IsInvalid; 66 } 67 68 /// VisitDeclRefExpr - Visit a reference to a declaration, to 69 /// determine whether this declaration can be used in the default 70 /// argument expression. 71 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 72 NamedDecl *Decl = DRE->getDecl(); 73 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 74 // C++ [dcl.fct.default]p9 75 // Default arguments are evaluated each time the function is 76 // called. The order of evaluation of function arguments is 77 // unspecified. Consequently, parameters of a function shall not 78 // be used in default argument expressions, even if they are not 79 // evaluated. Parameters of a function declared before a default 80 // argument expression are in scope and can hide namespace and 81 // class member names. 82 return S->Diag(DRE->getSourceRange().getBegin(), 83 diag::err_param_default_argument_references_param) 84 << Param->getDeclName() << DefaultArg->getSourceRange(); 85 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 86 // C++ [dcl.fct.default]p7 87 // Local variables shall not be used in default argument 88 // expressions. 89 if (VDecl->isBlockVarDecl()) 90 return S->Diag(DRE->getSourceRange().getBegin(), 91 diag::err_param_default_argument_references_local) 92 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 93 } 94 95 return false; 96 } 97 98 /// VisitCXXThisExpr - Visit a C++ "this" expression. 99 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 100 // C++ [dcl.fct.default]p8: 101 // The keyword this shall not be used in a default argument of a 102 // member function. 103 return S->Diag(ThisE->getSourceRange().getBegin(), 104 diag::err_param_default_argument_references_this) 105 << ThisE->getSourceRange(); 106 } 107} 108 109bool 110Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 111 SourceLocation EqualLoc) { 112 if (RequireCompleteType(Param->getLocation(), Param->getType(), 113 diag::err_typecheck_decl_incomplete_type)) { 114 Param->setInvalidDecl(); 115 return true; 116 } 117 118 Expr *Arg = (Expr *)DefaultArg.get(); 119 120 // C++ [dcl.fct.default]p5 121 // A default argument expression is implicitly converted (clause 122 // 4) to the parameter type. The default argument expression has 123 // the same semantic constraints as the initializer expression in 124 // a declaration of a variable of the parameter type, using the 125 // copy-initialization semantics (8.5). 126 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 127 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 128 EqualLoc); 129 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 130 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 131 MultiExprArg(*this, (void**)&Arg, 1)); 132 if (Result.isInvalid()) 133 return true; 134 Arg = Result.takeAs<Expr>(); 135 136 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 137 138 // Okay: add the default argument to the parameter 139 Param->setDefaultArg(Arg); 140 141 DefaultArg.release(); 142 143 return false; 144} 145 146/// ActOnParamDefaultArgument - Check whether the default argument 147/// provided for a function parameter is well-formed. If so, attach it 148/// to the parameter declaration. 149void 150Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 151 ExprArg defarg) { 152 if (!param || !defarg.get()) 153 return; 154 155 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 156 UnparsedDefaultArgLocs.erase(Param); 157 158 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 159 160 // Default arguments are only permitted in C++ 161 if (!getLangOptions().CPlusPlus) { 162 Diag(EqualLoc, diag::err_param_default_argument) 163 << DefaultArg->getSourceRange(); 164 Param->setInvalidDecl(); 165 return; 166 } 167 168 // Check that the default argument is well-formed 169 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 170 if (DefaultArgChecker.Visit(DefaultArg.get())) { 171 Param->setInvalidDecl(); 172 return; 173 } 174 175 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 176} 177 178/// ActOnParamUnparsedDefaultArgument - We've seen a default 179/// argument for a function parameter, but we can't parse it yet 180/// because we're inside a class definition. Note that this default 181/// argument will be parsed later. 182void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 183 SourceLocation EqualLoc, 184 SourceLocation ArgLoc) { 185 if (!param) 186 return; 187 188 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 189 if (Param) 190 Param->setUnparsedDefaultArg(); 191 192 UnparsedDefaultArgLocs[Param] = ArgLoc; 193} 194 195/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 196/// the default argument for the parameter param failed. 197void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 198 if (!param) 199 return; 200 201 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 202 203 Param->setInvalidDecl(); 204 205 UnparsedDefaultArgLocs.erase(Param); 206} 207 208/// CheckExtraCXXDefaultArguments - Check for any extra default 209/// arguments in the declarator, which is not a function declaration 210/// or definition and therefore is not permitted to have default 211/// arguments. This routine should be invoked for every declarator 212/// that is not a function declaration or definition. 213void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 214 // C++ [dcl.fct.default]p3 215 // A default argument expression shall be specified only in the 216 // parameter-declaration-clause of a function declaration or in a 217 // template-parameter (14.1). It shall not be specified for a 218 // parameter pack. If it is specified in a 219 // parameter-declaration-clause, it shall not occur within a 220 // declarator or abstract-declarator of a parameter-declaration. 221 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 222 DeclaratorChunk &chunk = D.getTypeObject(i); 223 if (chunk.Kind == DeclaratorChunk::Function) { 224 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 225 ParmVarDecl *Param = 226 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 227 if (Param->hasUnparsedDefaultArg()) { 228 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 229 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 230 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 231 delete Toks; 232 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 233 } else if (Param->getDefaultArg()) { 234 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 235 << Param->getDefaultArg()->getSourceRange(); 236 Param->setDefaultArg(0); 237 } 238 } 239 } 240 } 241} 242 243// MergeCXXFunctionDecl - Merge two declarations of the same C++ 244// function, once we already know that they have the same 245// type. Subroutine of MergeFunctionDecl. Returns true if there was an 246// error, false otherwise. 247bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 248 bool Invalid = false; 249 250 // C++ [dcl.fct.default]p4: 251 // For non-template functions, default arguments can be added in 252 // later declarations of a function in the same 253 // scope. Declarations in different scopes have completely 254 // distinct sets of default arguments. That is, declarations in 255 // inner scopes do not acquire default arguments from 256 // declarations in outer scopes, and vice versa. In a given 257 // function declaration, all parameters subsequent to a 258 // parameter with a default argument shall have default 259 // arguments supplied in this or previous declarations. A 260 // default argument shall not be redefined by a later 261 // declaration (not even to the same value). 262 // 263 // C++ [dcl.fct.default]p6: 264 // Except for member functions of class templates, the default arguments 265 // in a member function definition that appears outside of the class 266 // definition are added to the set of default arguments provided by the 267 // member function declaration in the class definition. 268 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 269 ParmVarDecl *OldParam = Old->getParamDecl(p); 270 ParmVarDecl *NewParam = New->getParamDecl(p); 271 272 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 273 // FIXME: If the parameter doesn't have an identifier then the location 274 // points to the '=' which means that the fixit hint won't remove any 275 // extra spaces between the type and the '='. 276 SourceLocation Begin = NewParam->getLocation(); 277 if (NewParam->getIdentifier()) 278 Begin = PP.getLocForEndOfToken(Begin); 279 280 Diag(NewParam->getLocation(), 281 diag::err_param_default_argument_redefinition) 282 << NewParam->getDefaultArgRange() 283 << CodeModificationHint::CreateRemoval(SourceRange(Begin, 284 NewParam->getLocEnd())); 285 286 // Look for the function declaration where the default argument was 287 // actually written, which may be a declaration prior to Old. 288 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 289 Older; Older = Older->getPreviousDeclaration()) { 290 if (!Older->getParamDecl(p)->hasDefaultArg()) 291 break; 292 293 OldParam = Older->getParamDecl(p); 294 } 295 296 Diag(OldParam->getLocation(), diag::note_previous_definition) 297 << OldParam->getDefaultArgRange(); 298 Invalid = true; 299 } else if (OldParam->hasDefaultArg()) { 300 // Merge the old default argument into the new parameter 301 if (OldParam->hasUninstantiatedDefaultArg()) 302 NewParam->setUninstantiatedDefaultArg( 303 OldParam->getUninstantiatedDefaultArg()); 304 else 305 NewParam->setDefaultArg(OldParam->getDefaultArg()); 306 } else if (NewParam->hasDefaultArg()) { 307 if (New->getDescribedFunctionTemplate()) { 308 // Paragraph 4, quoted above, only applies to non-template functions. 309 Diag(NewParam->getLocation(), 310 diag::err_param_default_argument_template_redecl) 311 << NewParam->getDefaultArgRange(); 312 Diag(Old->getLocation(), diag::note_template_prev_declaration) 313 << false; 314 } else if (New->getTemplateSpecializationKind() 315 != TSK_ImplicitInstantiation && 316 New->getTemplateSpecializationKind() != TSK_Undeclared) { 317 // C++ [temp.expr.spec]p21: 318 // Default function arguments shall not be specified in a declaration 319 // or a definition for one of the following explicit specializations: 320 // - the explicit specialization of a function template; 321 // - the explicit specialization of a member function template; 322 // - the explicit specialization of a member function of a class 323 // template where the class template specialization to which the 324 // member function specialization belongs is implicitly 325 // instantiated. 326 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 327 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 328 << New->getDeclName() 329 << NewParam->getDefaultArgRange(); 330 } else if (New->getDeclContext()->isDependentContext()) { 331 // C++ [dcl.fct.default]p6 (DR217): 332 // Default arguments for a member function of a class template shall 333 // be specified on the initial declaration of the member function 334 // within the class template. 335 // 336 // Reading the tea leaves a bit in DR217 and its reference to DR205 337 // leads me to the conclusion that one cannot add default function 338 // arguments for an out-of-line definition of a member function of a 339 // dependent type. 340 int WhichKind = 2; 341 if (CXXRecordDecl *Record 342 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 343 if (Record->getDescribedClassTemplate()) 344 WhichKind = 0; 345 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 346 WhichKind = 1; 347 else 348 WhichKind = 2; 349 } 350 351 Diag(NewParam->getLocation(), 352 diag::err_param_default_argument_member_template_redecl) 353 << WhichKind 354 << NewParam->getDefaultArgRange(); 355 } 356 } 357 } 358 359 if (CheckEquivalentExceptionSpec( 360 Old->getType()->getAs<FunctionProtoType>(), Old->getLocation(), 361 New->getType()->getAs<FunctionProtoType>(), New->getLocation())) 362 Invalid = true; 363 364 return Invalid; 365} 366 367/// CheckCXXDefaultArguments - Verify that the default arguments for a 368/// function declaration are well-formed according to C++ 369/// [dcl.fct.default]. 370void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 371 unsigned NumParams = FD->getNumParams(); 372 unsigned p; 373 374 // Find first parameter with a default argument 375 for (p = 0; p < NumParams; ++p) { 376 ParmVarDecl *Param = FD->getParamDecl(p); 377 if (Param->hasDefaultArg()) 378 break; 379 } 380 381 // C++ [dcl.fct.default]p4: 382 // In a given function declaration, all parameters 383 // subsequent to a parameter with a default argument shall 384 // have default arguments supplied in this or previous 385 // declarations. A default argument shall not be redefined 386 // by a later declaration (not even to the same value). 387 unsigned LastMissingDefaultArg = 0; 388 for (; p < NumParams; ++p) { 389 ParmVarDecl *Param = FD->getParamDecl(p); 390 if (!Param->hasDefaultArg()) { 391 if (Param->isInvalidDecl()) 392 /* We already complained about this parameter. */; 393 else if (Param->getIdentifier()) 394 Diag(Param->getLocation(), 395 diag::err_param_default_argument_missing_name) 396 << Param->getIdentifier(); 397 else 398 Diag(Param->getLocation(), 399 diag::err_param_default_argument_missing); 400 401 LastMissingDefaultArg = p; 402 } 403 } 404 405 if (LastMissingDefaultArg > 0) { 406 // Some default arguments were missing. Clear out all of the 407 // default arguments up to (and including) the last missing 408 // default argument, so that we leave the function parameters 409 // in a semantically valid state. 410 for (p = 0; p <= LastMissingDefaultArg; ++p) { 411 ParmVarDecl *Param = FD->getParamDecl(p); 412 if (Param->hasDefaultArg()) { 413 if (!Param->hasUnparsedDefaultArg()) 414 Param->getDefaultArg()->Destroy(Context); 415 Param->setDefaultArg(0); 416 } 417 } 418 } 419} 420 421/// isCurrentClassName - Determine whether the identifier II is the 422/// name of the class type currently being defined. In the case of 423/// nested classes, this will only return true if II is the name of 424/// the innermost class. 425bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 426 const CXXScopeSpec *SS) { 427 CXXRecordDecl *CurDecl; 428 if (SS && SS->isSet() && !SS->isInvalid()) { 429 DeclContext *DC = computeDeclContext(*SS, true); 430 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 431 } else 432 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 433 434 if (CurDecl) 435 return &II == CurDecl->getIdentifier(); 436 else 437 return false; 438} 439 440/// \brief Check the validity of a C++ base class specifier. 441/// 442/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 443/// and returns NULL otherwise. 444CXXBaseSpecifier * 445Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 446 SourceRange SpecifierRange, 447 bool Virtual, AccessSpecifier Access, 448 QualType BaseType, 449 SourceLocation BaseLoc) { 450 // C++ [class.union]p1: 451 // A union shall not have base classes. 452 if (Class->isUnion()) { 453 Diag(Class->getLocation(), diag::err_base_clause_on_union) 454 << SpecifierRange; 455 return 0; 456 } 457 458 if (BaseType->isDependentType()) 459 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 460 Class->getTagKind() == RecordDecl::TK_class, 461 Access, BaseType); 462 463 // Base specifiers must be record types. 464 if (!BaseType->isRecordType()) { 465 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 466 return 0; 467 } 468 469 // C++ [class.union]p1: 470 // A union shall not be used as a base class. 471 if (BaseType->isUnionType()) { 472 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 473 return 0; 474 } 475 476 // C++ [class.derived]p2: 477 // The class-name in a base-specifier shall not be an incompletely 478 // defined class. 479 if (RequireCompleteType(BaseLoc, BaseType, 480 PDiag(diag::err_incomplete_base_class) 481 << SpecifierRange)) 482 return 0; 483 484 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 485 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 486 assert(BaseDecl && "Record type has no declaration"); 487 BaseDecl = BaseDecl->getDefinition(Context); 488 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 489 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 490 assert(CXXBaseDecl && "Base type is not a C++ type"); 491 492 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 493 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 494 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 495 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 496 << BaseType; 497 return 0; 498 } 499 500 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 501 502 // Create the base specifier. 503 // FIXME: Allocate via ASTContext? 504 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 505 Class->getTagKind() == RecordDecl::TK_class, 506 Access, BaseType); 507} 508 509void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 510 const CXXRecordDecl *BaseClass, 511 bool BaseIsVirtual) { 512 // A class with a non-empty base class is not empty. 513 // FIXME: Standard ref? 514 if (!BaseClass->isEmpty()) 515 Class->setEmpty(false); 516 517 // C++ [class.virtual]p1: 518 // A class that [...] inherits a virtual function is called a polymorphic 519 // class. 520 if (BaseClass->isPolymorphic()) 521 Class->setPolymorphic(true); 522 523 // C++ [dcl.init.aggr]p1: 524 // An aggregate is [...] a class with [...] no base classes [...]. 525 Class->setAggregate(false); 526 527 // C++ [class]p4: 528 // A POD-struct is an aggregate class... 529 Class->setPOD(false); 530 531 if (BaseIsVirtual) { 532 // C++ [class.ctor]p5: 533 // A constructor is trivial if its class has no virtual base classes. 534 Class->setHasTrivialConstructor(false); 535 536 // C++ [class.copy]p6: 537 // A copy constructor is trivial if its class has no virtual base classes. 538 Class->setHasTrivialCopyConstructor(false); 539 540 // C++ [class.copy]p11: 541 // A copy assignment operator is trivial if its class has no virtual 542 // base classes. 543 Class->setHasTrivialCopyAssignment(false); 544 545 // C++0x [meta.unary.prop] is_empty: 546 // T is a class type, but not a union type, with ... no virtual base 547 // classes 548 Class->setEmpty(false); 549 } else { 550 // C++ [class.ctor]p5: 551 // A constructor is trivial if all the direct base classes of its 552 // class have trivial constructors. 553 if (!BaseClass->hasTrivialConstructor()) 554 Class->setHasTrivialConstructor(false); 555 556 // C++ [class.copy]p6: 557 // A copy constructor is trivial if all the direct base classes of its 558 // class have trivial copy constructors. 559 if (!BaseClass->hasTrivialCopyConstructor()) 560 Class->setHasTrivialCopyConstructor(false); 561 562 // C++ [class.copy]p11: 563 // A copy assignment operator is trivial if all the direct base classes 564 // of its class have trivial copy assignment operators. 565 if (!BaseClass->hasTrivialCopyAssignment()) 566 Class->setHasTrivialCopyAssignment(false); 567 } 568 569 // C++ [class.ctor]p3: 570 // A destructor is trivial if all the direct base classes of its class 571 // have trivial destructors. 572 if (!BaseClass->hasTrivialDestructor()) 573 Class->setHasTrivialDestructor(false); 574} 575 576/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 577/// one entry in the base class list of a class specifier, for 578/// example: 579/// class foo : public bar, virtual private baz { 580/// 'public bar' and 'virtual private baz' are each base-specifiers. 581Sema::BaseResult 582Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 583 bool Virtual, AccessSpecifier Access, 584 TypeTy *basetype, SourceLocation BaseLoc) { 585 if (!classdecl) 586 return true; 587 588 AdjustDeclIfTemplate(classdecl); 589 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 590 QualType BaseType = GetTypeFromParser(basetype); 591 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 592 Virtual, Access, 593 BaseType, BaseLoc)) 594 return BaseSpec; 595 596 return true; 597} 598 599/// \brief Performs the actual work of attaching the given base class 600/// specifiers to a C++ class. 601bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 602 unsigned NumBases) { 603 if (NumBases == 0) 604 return false; 605 606 // Used to keep track of which base types we have already seen, so 607 // that we can properly diagnose redundant direct base types. Note 608 // that the key is always the unqualified canonical type of the base 609 // class. 610 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 611 612 // Copy non-redundant base specifiers into permanent storage. 613 unsigned NumGoodBases = 0; 614 bool Invalid = false; 615 for (unsigned idx = 0; idx < NumBases; ++idx) { 616 QualType NewBaseType 617 = Context.getCanonicalType(Bases[idx]->getType()); 618 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 619 620 if (KnownBaseTypes[NewBaseType]) { 621 // C++ [class.mi]p3: 622 // A class shall not be specified as a direct base class of a 623 // derived class more than once. 624 Diag(Bases[idx]->getSourceRange().getBegin(), 625 diag::err_duplicate_base_class) 626 << KnownBaseTypes[NewBaseType]->getType() 627 << Bases[idx]->getSourceRange(); 628 629 // Delete the duplicate base class specifier; we're going to 630 // overwrite its pointer later. 631 Context.Deallocate(Bases[idx]); 632 633 Invalid = true; 634 } else { 635 // Okay, add this new base class. 636 KnownBaseTypes[NewBaseType] = Bases[idx]; 637 Bases[NumGoodBases++] = Bases[idx]; 638 } 639 } 640 641 // Attach the remaining base class specifiers to the derived class. 642 Class->setBases(Context, Bases, NumGoodBases); 643 644 // Delete the remaining (good) base class specifiers, since their 645 // data has been copied into the CXXRecordDecl. 646 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 647 Context.Deallocate(Bases[idx]); 648 649 return Invalid; 650} 651 652/// ActOnBaseSpecifiers - Attach the given base specifiers to the 653/// class, after checking whether there are any duplicate base 654/// classes. 655void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 656 unsigned NumBases) { 657 if (!ClassDecl || !Bases || !NumBases) 658 return; 659 660 AdjustDeclIfTemplate(ClassDecl); 661 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 662 (CXXBaseSpecifier**)(Bases), NumBases); 663} 664 665/// \brief Determine whether the type \p Derived is a C++ class that is 666/// derived from the type \p Base. 667bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 668 if (!getLangOptions().CPlusPlus) 669 return false; 670 671 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 672 if (!DerivedRT) 673 return false; 674 675 const RecordType *BaseRT = Base->getAs<RecordType>(); 676 if (!BaseRT) 677 return false; 678 679 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 680 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 681 return DerivedRD->isDerivedFrom(BaseRD); 682} 683 684/// \brief Determine whether the type \p Derived is a C++ class that is 685/// derived from the type \p Base. 686bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 687 if (!getLangOptions().CPlusPlus) 688 return false; 689 690 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 691 if (!DerivedRT) 692 return false; 693 694 const RecordType *BaseRT = Base->getAs<RecordType>(); 695 if (!BaseRT) 696 return false; 697 698 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 699 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 700 return DerivedRD->isDerivedFrom(BaseRD, Paths); 701} 702 703/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 704/// conversion (where Derived and Base are class types) is 705/// well-formed, meaning that the conversion is unambiguous (and 706/// that all of the base classes are accessible). Returns true 707/// and emits a diagnostic if the code is ill-formed, returns false 708/// otherwise. Loc is the location where this routine should point to 709/// if there is an error, and Range is the source range to highlight 710/// if there is an error. 711bool 712Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 713 unsigned InaccessibleBaseID, 714 unsigned AmbigiousBaseConvID, 715 SourceLocation Loc, SourceRange Range, 716 DeclarationName Name) { 717 // First, determine whether the path from Derived to Base is 718 // ambiguous. This is slightly more expensive than checking whether 719 // the Derived to Base conversion exists, because here we need to 720 // explore multiple paths to determine if there is an ambiguity. 721 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 722 /*DetectVirtual=*/false); 723 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 724 assert(DerivationOkay && 725 "Can only be used with a derived-to-base conversion"); 726 (void)DerivationOkay; 727 728 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 729 if (InaccessibleBaseID == 0) 730 return false; 731 // Check that the base class can be accessed. 732 return CheckBaseClassAccess(Derived, Base, InaccessibleBaseID, Paths, Loc, 733 Name); 734 } 735 736 // We know that the derived-to-base conversion is ambiguous, and 737 // we're going to produce a diagnostic. Perform the derived-to-base 738 // search just one more time to compute all of the possible paths so 739 // that we can print them out. This is more expensive than any of 740 // the previous derived-to-base checks we've done, but at this point 741 // performance isn't as much of an issue. 742 Paths.clear(); 743 Paths.setRecordingPaths(true); 744 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 745 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 746 (void)StillOkay; 747 748 // Build up a textual representation of the ambiguous paths, e.g., 749 // D -> B -> A, that will be used to illustrate the ambiguous 750 // conversions in the diagnostic. We only print one of the paths 751 // to each base class subobject. 752 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 753 754 Diag(Loc, AmbigiousBaseConvID) 755 << Derived << Base << PathDisplayStr << Range << Name; 756 return true; 757} 758 759bool 760Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 761 SourceLocation Loc, SourceRange Range, 762 bool IgnoreAccess) { 763 return CheckDerivedToBaseConversion(Derived, Base, 764 IgnoreAccess ? 0 : 765 diag::err_conv_to_inaccessible_base, 766 diag::err_ambiguous_derived_to_base_conv, 767 Loc, Range, DeclarationName()); 768} 769 770 771/// @brief Builds a string representing ambiguous paths from a 772/// specific derived class to different subobjects of the same base 773/// class. 774/// 775/// This function builds a string that can be used in error messages 776/// to show the different paths that one can take through the 777/// inheritance hierarchy to go from the derived class to different 778/// subobjects of a base class. The result looks something like this: 779/// @code 780/// struct D -> struct B -> struct A 781/// struct D -> struct C -> struct A 782/// @endcode 783std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 784 std::string PathDisplayStr; 785 std::set<unsigned> DisplayedPaths; 786 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 787 Path != Paths.end(); ++Path) { 788 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 789 // We haven't displayed a path to this particular base 790 // class subobject yet. 791 PathDisplayStr += "\n "; 792 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 793 for (CXXBasePath::const_iterator Element = Path->begin(); 794 Element != Path->end(); ++Element) 795 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 796 } 797 } 798 799 return PathDisplayStr; 800} 801 802//===----------------------------------------------------------------------===// 803// C++ class member Handling 804//===----------------------------------------------------------------------===// 805 806/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 807/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 808/// bitfield width if there is one and 'InitExpr' specifies the initializer if 809/// any. 810Sema::DeclPtrTy 811Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 812 MultiTemplateParamsArg TemplateParameterLists, 813 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 814 bool Deleted) { 815 const DeclSpec &DS = D.getDeclSpec(); 816 DeclarationName Name = GetNameForDeclarator(D); 817 Expr *BitWidth = static_cast<Expr*>(BW); 818 Expr *Init = static_cast<Expr*>(InitExpr); 819 SourceLocation Loc = D.getIdentifierLoc(); 820 821 bool isFunc = D.isFunctionDeclarator(); 822 823 assert(!DS.isFriendSpecified()); 824 825 // C++ 9.2p6: A member shall not be declared to have automatic storage 826 // duration (auto, register) or with the extern storage-class-specifier. 827 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 828 // data members and cannot be applied to names declared const or static, 829 // and cannot be applied to reference members. 830 switch (DS.getStorageClassSpec()) { 831 case DeclSpec::SCS_unspecified: 832 case DeclSpec::SCS_typedef: 833 case DeclSpec::SCS_static: 834 // FALL THROUGH. 835 break; 836 case DeclSpec::SCS_mutable: 837 if (isFunc) { 838 if (DS.getStorageClassSpecLoc().isValid()) 839 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 840 else 841 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 842 843 // FIXME: It would be nicer if the keyword was ignored only for this 844 // declarator. Otherwise we could get follow-up errors. 845 D.getMutableDeclSpec().ClearStorageClassSpecs(); 846 } else { 847 QualType T = GetTypeForDeclarator(D, S); 848 diag::kind err = static_cast<diag::kind>(0); 849 if (T->isReferenceType()) 850 err = diag::err_mutable_reference; 851 else if (T.isConstQualified()) 852 err = diag::err_mutable_const; 853 if (err != 0) { 854 if (DS.getStorageClassSpecLoc().isValid()) 855 Diag(DS.getStorageClassSpecLoc(), err); 856 else 857 Diag(DS.getThreadSpecLoc(), err); 858 // FIXME: It would be nicer if the keyword was ignored only for this 859 // declarator. Otherwise we could get follow-up errors. 860 D.getMutableDeclSpec().ClearStorageClassSpecs(); 861 } 862 } 863 break; 864 default: 865 if (DS.getStorageClassSpecLoc().isValid()) 866 Diag(DS.getStorageClassSpecLoc(), 867 diag::err_storageclass_invalid_for_member); 868 else 869 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 870 D.getMutableDeclSpec().ClearStorageClassSpecs(); 871 } 872 873 if (!isFunc && 874 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 875 D.getNumTypeObjects() == 0) { 876 // Check also for this case: 877 // 878 // typedef int f(); 879 // f a; 880 // 881 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 882 isFunc = TDType->isFunctionType(); 883 } 884 885 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 886 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 887 !isFunc); 888 889 Decl *Member; 890 if (isInstField) { 891 // FIXME: Check for template parameters! 892 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 893 AS); 894 assert(Member && "HandleField never returns null"); 895 } else { 896 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 897 .getAs<Decl>(); 898 if (!Member) { 899 if (BitWidth) DeleteExpr(BitWidth); 900 return DeclPtrTy(); 901 } 902 903 // Non-instance-fields can't have a bitfield. 904 if (BitWidth) { 905 if (Member->isInvalidDecl()) { 906 // don't emit another diagnostic. 907 } else if (isa<VarDecl>(Member)) { 908 // C++ 9.6p3: A bit-field shall not be a static member. 909 // "static member 'A' cannot be a bit-field" 910 Diag(Loc, diag::err_static_not_bitfield) 911 << Name << BitWidth->getSourceRange(); 912 } else if (isa<TypedefDecl>(Member)) { 913 // "typedef member 'x' cannot be a bit-field" 914 Diag(Loc, diag::err_typedef_not_bitfield) 915 << Name << BitWidth->getSourceRange(); 916 } else { 917 // A function typedef ("typedef int f(); f a;"). 918 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 919 Diag(Loc, diag::err_not_integral_type_bitfield) 920 << Name << cast<ValueDecl>(Member)->getType() 921 << BitWidth->getSourceRange(); 922 } 923 924 DeleteExpr(BitWidth); 925 BitWidth = 0; 926 Member->setInvalidDecl(); 927 } 928 929 Member->setAccess(AS); 930 931 // If we have declared a member function template, set the access of the 932 // templated declaration as well. 933 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 934 FunTmpl->getTemplatedDecl()->setAccess(AS); 935 } 936 937 assert((Name || isInstField) && "No identifier for non-field ?"); 938 939 if (Init) 940 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 941 if (Deleted) // FIXME: Source location is not very good. 942 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 943 944 if (isInstField) { 945 FieldCollector->Add(cast<FieldDecl>(Member)); 946 return DeclPtrTy(); 947 } 948 return DeclPtrTy::make(Member); 949} 950 951/// \brief Find the direct and/or virtual base specifiers that 952/// correspond to the given base type, for use in base initialization 953/// within a constructor. 954static bool FindBaseInitializer(Sema &SemaRef, 955 CXXRecordDecl *ClassDecl, 956 QualType BaseType, 957 const CXXBaseSpecifier *&DirectBaseSpec, 958 const CXXBaseSpecifier *&VirtualBaseSpec) { 959 // First, check for a direct base class. 960 DirectBaseSpec = 0; 961 for (CXXRecordDecl::base_class_const_iterator Base 962 = ClassDecl->bases_begin(); 963 Base != ClassDecl->bases_end(); ++Base) { 964 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 965 // We found a direct base of this type. That's what we're 966 // initializing. 967 DirectBaseSpec = &*Base; 968 break; 969 } 970 } 971 972 // Check for a virtual base class. 973 // FIXME: We might be able to short-circuit this if we know in advance that 974 // there are no virtual bases. 975 VirtualBaseSpec = 0; 976 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 977 // We haven't found a base yet; search the class hierarchy for a 978 // virtual base class. 979 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 980 /*DetectVirtual=*/false); 981 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 982 BaseType, Paths)) { 983 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 984 Path != Paths.end(); ++Path) { 985 if (Path->back().Base->isVirtual()) { 986 VirtualBaseSpec = Path->back().Base; 987 break; 988 } 989 } 990 } 991 } 992 993 return DirectBaseSpec || VirtualBaseSpec; 994} 995 996/// ActOnMemInitializer - Handle a C++ member initializer. 997Sema::MemInitResult 998Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 999 Scope *S, 1000 const CXXScopeSpec &SS, 1001 IdentifierInfo *MemberOrBase, 1002 TypeTy *TemplateTypeTy, 1003 SourceLocation IdLoc, 1004 SourceLocation LParenLoc, 1005 ExprTy **Args, unsigned NumArgs, 1006 SourceLocation *CommaLocs, 1007 SourceLocation RParenLoc) { 1008 if (!ConstructorD) 1009 return true; 1010 1011 AdjustDeclIfTemplate(ConstructorD); 1012 1013 CXXConstructorDecl *Constructor 1014 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1015 if (!Constructor) { 1016 // The user wrote a constructor initializer on a function that is 1017 // not a C++ constructor. Ignore the error for now, because we may 1018 // have more member initializers coming; we'll diagnose it just 1019 // once in ActOnMemInitializers. 1020 return true; 1021 } 1022 1023 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1024 1025 // C++ [class.base.init]p2: 1026 // Names in a mem-initializer-id are looked up in the scope of the 1027 // constructor’s class and, if not found in that scope, are looked 1028 // up in the scope containing the constructor’s 1029 // definition. [Note: if the constructor’s class contains a member 1030 // with the same name as a direct or virtual base class of the 1031 // class, a mem-initializer-id naming the member or base class and 1032 // composed of a single identifier refers to the class member. A 1033 // mem-initializer-id for the hidden base class may be specified 1034 // using a qualified name. ] 1035 if (!SS.getScopeRep() && !TemplateTypeTy) { 1036 // Look for a member, first. 1037 FieldDecl *Member = 0; 1038 DeclContext::lookup_result Result 1039 = ClassDecl->lookup(MemberOrBase); 1040 if (Result.first != Result.second) 1041 Member = dyn_cast<FieldDecl>(*Result.first); 1042 1043 // FIXME: Handle members of an anonymous union. 1044 1045 if (Member) 1046 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1047 LParenLoc, RParenLoc); 1048 } 1049 // It didn't name a member, so see if it names a class. 1050 QualType BaseType; 1051 TypeSourceInfo *TInfo = 0; 1052 1053 if (TemplateTypeTy) { 1054 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1055 } else { 1056 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1057 LookupParsedName(R, S, &SS); 1058 1059 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1060 if (!TyD) { 1061 if (R.isAmbiguous()) return true; 1062 1063 // If no results were found, try to correct typos. 1064 if (R.empty() && 1065 CorrectTypo(R, S, &SS, ClassDecl) && R.isSingleResult()) { 1066 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1067 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1068 // We have found a non-static data member with a similar 1069 // name to what was typed; complain and initialize that 1070 // member. 1071 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1072 << MemberOrBase << true << R.getLookupName() 1073 << CodeModificationHint::CreateReplacement(R.getNameLoc(), 1074 R.getLookupName().getAsString()); 1075 Diag(Member->getLocation(), diag::note_previous_decl) 1076 << Member->getDeclName(); 1077 1078 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1079 LParenLoc, RParenLoc); 1080 } 1081 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1082 const CXXBaseSpecifier *DirectBaseSpec; 1083 const CXXBaseSpecifier *VirtualBaseSpec; 1084 if (FindBaseInitializer(*this, ClassDecl, 1085 Context.getTypeDeclType(Type), 1086 DirectBaseSpec, VirtualBaseSpec)) { 1087 // We have found a direct or virtual base class with a 1088 // similar name to what was typed; complain and initialize 1089 // that base class. 1090 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1091 << MemberOrBase << false << R.getLookupName() 1092 << CodeModificationHint::CreateReplacement(R.getNameLoc(), 1093 R.getLookupName().getAsString()); 1094 1095 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1096 : VirtualBaseSpec; 1097 Diag(BaseSpec->getSourceRange().getBegin(), 1098 diag::note_base_class_specified_here) 1099 << BaseSpec->getType() 1100 << BaseSpec->getSourceRange(); 1101 1102 TyD = Type; 1103 } 1104 } 1105 } 1106 1107 if (!TyD) { 1108 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1109 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1110 return true; 1111 } 1112 } 1113 1114 BaseType = Context.getTypeDeclType(TyD); 1115 if (SS.isSet()) { 1116 NestedNameSpecifier *Qualifier = 1117 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1118 1119 // FIXME: preserve source range information 1120 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1121 } 1122 } 1123 1124 if (!TInfo) 1125 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1126 1127 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1128 LParenLoc, RParenLoc, ClassDecl); 1129} 1130 1131/// Checks an initializer expression for use of uninitialized fields, such as 1132/// containing the field that is being initialized. Returns true if there is an 1133/// uninitialized field was used an updates the SourceLocation parameter; false 1134/// otherwise. 1135static bool InitExprContainsUninitializedFields(const Stmt* S, 1136 const FieldDecl* LhsField, 1137 SourceLocation* L) { 1138 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1139 if (ME) { 1140 const NamedDecl* RhsField = ME->getMemberDecl(); 1141 if (RhsField == LhsField) { 1142 // Initializing a field with itself. Throw a warning. 1143 // But wait; there are exceptions! 1144 // Exception #1: The field may not belong to this record. 1145 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1146 const Expr* base = ME->getBase(); 1147 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1148 // Even though the field matches, it does not belong to this record. 1149 return false; 1150 } 1151 // None of the exceptions triggered; return true to indicate an 1152 // uninitialized field was used. 1153 *L = ME->getMemberLoc(); 1154 return true; 1155 } 1156 } 1157 bool found = false; 1158 for (Stmt::const_child_iterator it = S->child_begin(); 1159 it != S->child_end() && found == false; 1160 ++it) { 1161 if (isa<CallExpr>(S)) { 1162 // Do not descend into function calls or constructors, as the use 1163 // of an uninitialized field may be valid. One would have to inspect 1164 // the contents of the function/ctor to determine if it is safe or not. 1165 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1166 // may be safe, depending on what the function/ctor does. 1167 continue; 1168 } 1169 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1170 } 1171 return found; 1172} 1173 1174Sema::MemInitResult 1175Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1176 unsigned NumArgs, SourceLocation IdLoc, 1177 SourceLocation LParenLoc, 1178 SourceLocation RParenLoc) { 1179 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1180 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1181 ExprTemporaries.clear(); 1182 1183 // Diagnose value-uses of fields to initialize themselves, e.g. 1184 // foo(foo) 1185 // where foo is not also a parameter to the constructor. 1186 // TODO: implement -Wuninitialized and fold this into that framework. 1187 for (unsigned i = 0; i < NumArgs; ++i) { 1188 SourceLocation L; 1189 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1190 // FIXME: Return true in the case when other fields are used before being 1191 // uninitialized. For example, let this field be the i'th field. When 1192 // initializing the i'th field, throw a warning if any of the >= i'th 1193 // fields are used, as they are not yet initialized. 1194 // Right now we are only handling the case where the i'th field uses 1195 // itself in its initializer. 1196 Diag(L, diag::warn_field_is_uninit); 1197 } 1198 } 1199 1200 bool HasDependentArg = false; 1201 for (unsigned i = 0; i < NumArgs; i++) 1202 HasDependentArg |= Args[i]->isTypeDependent(); 1203 1204 CXXConstructorDecl *C = 0; 1205 QualType FieldType = Member->getType(); 1206 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1207 FieldType = Array->getElementType(); 1208 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1209 if (FieldType->isDependentType()) { 1210 // Can't check init for dependent type. 1211 } else if (FieldType->isRecordType()) { 1212 // Member is a record (struct/union/class), so pass the initializer 1213 // arguments down to the record's constructor. 1214 if (!HasDependentArg) { 1215 C = PerformInitializationByConstructor(FieldType, 1216 MultiExprArg(*this, 1217 (void**)Args, 1218 NumArgs), 1219 IdLoc, 1220 SourceRange(IdLoc, RParenLoc), 1221 Member->getDeclName(), 1222 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc), 1223 ConstructorArgs); 1224 1225 if (C) { 1226 // Take over the constructor arguments as our own. 1227 NumArgs = ConstructorArgs.size(); 1228 Args = (Expr **)ConstructorArgs.take(); 1229 } 1230 } 1231 } else if (NumArgs != 1 && NumArgs != 0) { 1232 // The member type is not a record type (or an array of record 1233 // types), so it can be only be default- or copy-initialized. 1234 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 1235 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 1236 } else if (!HasDependentArg) { 1237 Expr *NewExp; 1238 if (NumArgs == 0) { 1239 if (FieldType->isReferenceType()) { 1240 Diag(IdLoc, diag::err_null_intialized_reference_member) 1241 << Member->getDeclName(); 1242 return Diag(Member->getLocation(), diag::note_declared_at); 1243 } 1244 NewExp = new (Context) CXXZeroInitValueExpr(FieldType, IdLoc, RParenLoc); 1245 NumArgs = 1; 1246 } 1247 else 1248 NewExp = (Expr*)Args[0]; 1249 if (!Member->isInvalidDecl() && 1250 PerformCopyInitialization(NewExp, FieldType, AA_Passing)) 1251 return true; 1252 Args[0] = NewExp; 1253 } 1254 1255 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1256 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1257 ExprTemporaries.clear(); 1258 1259 // FIXME: Perform direct initialization of the member. 1260 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1261 C, LParenLoc, (Expr **)Args, 1262 NumArgs, RParenLoc); 1263} 1264 1265Sema::MemInitResult 1266Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1267 Expr **Args, unsigned NumArgs, 1268 SourceLocation LParenLoc, SourceLocation RParenLoc, 1269 CXXRecordDecl *ClassDecl) { 1270 bool HasDependentArg = false; 1271 for (unsigned i = 0; i < NumArgs; i++) 1272 HasDependentArg |= Args[i]->isTypeDependent(); 1273 1274 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1275 if (!BaseType->isDependentType()) { 1276 if (!BaseType->isRecordType()) 1277 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1278 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1279 1280 // C++ [class.base.init]p2: 1281 // [...] Unless the mem-initializer-id names a nonstatic data 1282 // member of the constructor’s class or a direct or virtual base 1283 // of that class, the mem-initializer is ill-formed. A 1284 // mem-initializer-list can initialize a base class using any 1285 // name that denotes that base class type. 1286 1287 // Check for direct and virtual base classes. 1288 const CXXBaseSpecifier *DirectBaseSpec = 0; 1289 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1290 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1291 VirtualBaseSpec); 1292 1293 // C++ [base.class.init]p2: 1294 // If a mem-initializer-id is ambiguous because it designates both 1295 // a direct non-virtual base class and an inherited virtual base 1296 // class, the mem-initializer is ill-formed. 1297 if (DirectBaseSpec && VirtualBaseSpec) 1298 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1299 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1300 // C++ [base.class.init]p2: 1301 // Unless the mem-initializer-id names a nonstatic data membeer of the 1302 // constructor's class ot a direst or virtual base of that class, the 1303 // mem-initializer is ill-formed. 1304 if (!DirectBaseSpec && !VirtualBaseSpec) 1305 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1306 << BaseType << ClassDecl->getNameAsCString() 1307 << BaseTInfo->getTypeLoc().getSourceRange(); 1308 } 1309 1310 CXXConstructorDecl *C = 0; 1311 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1312 if (!BaseType->isDependentType() && !HasDependentArg) { 1313 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 1314 Context.getCanonicalType(BaseType).getUnqualifiedType()); 1315 1316 C = PerformInitializationByConstructor(BaseType, 1317 MultiExprArg(*this, 1318 (void**)Args, NumArgs), 1319 BaseLoc, 1320 SourceRange(BaseLoc, RParenLoc), 1321 Name, 1322 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc), 1323 ConstructorArgs); 1324 if (C) { 1325 // Take over the constructor arguments as our own. 1326 NumArgs = ConstructorArgs.size(); 1327 Args = (Expr **)ConstructorArgs.take(); 1328 } 1329 } 1330 1331 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1332 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1333 ExprTemporaries.clear(); 1334 1335 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, C, 1336 LParenLoc, (Expr **)Args, 1337 NumArgs, RParenLoc); 1338} 1339 1340bool 1341Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1342 CXXBaseOrMemberInitializer **Initializers, 1343 unsigned NumInitializers, 1344 bool IsImplicitConstructor) { 1345 // We need to build the initializer AST according to order of construction 1346 // and not what user specified in the Initializers list. 1347 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1348 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1349 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1350 bool HasDependentBaseInit = false; 1351 bool HadError = false; 1352 1353 for (unsigned i = 0; i < NumInitializers; i++) { 1354 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1355 if (Member->isBaseInitializer()) { 1356 if (Member->getBaseClass()->isDependentType()) 1357 HasDependentBaseInit = true; 1358 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1359 } else { 1360 AllBaseFields[Member->getMember()] = Member; 1361 } 1362 } 1363 1364 if (HasDependentBaseInit) { 1365 // FIXME. This does not preserve the ordering of the initializers. 1366 // Try (with -Wreorder) 1367 // template<class X> struct A {}; 1368 // template<class X> struct B : A<X> { 1369 // B() : x1(10), A<X>() {} 1370 // int x1; 1371 // }; 1372 // B<int> x; 1373 // On seeing one dependent type, we should essentially exit this routine 1374 // while preserving user-declared initializer list. When this routine is 1375 // called during instantiatiation process, this routine will rebuild the 1376 // ordered initializer list correctly. 1377 1378 // If we have a dependent base initialization, we can't determine the 1379 // association between initializers and bases; just dump the known 1380 // initializers into the list, and don't try to deal with other bases. 1381 for (unsigned i = 0; i < NumInitializers; i++) { 1382 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1383 if (Member->isBaseInitializer()) 1384 AllToInit.push_back(Member); 1385 } 1386 } else { 1387 // Push virtual bases before others. 1388 for (CXXRecordDecl::base_class_iterator VBase = 1389 ClassDecl->vbases_begin(), 1390 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1391 if (VBase->getType()->isDependentType()) 1392 continue; 1393 if (CXXBaseOrMemberInitializer *Value 1394 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1395 AllToInit.push_back(Value); 1396 } 1397 else { 1398 CXXRecordDecl *VBaseDecl = 1399 cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1400 assert(VBaseDecl && "SetBaseOrMemberInitializers - VBaseDecl null"); 1401 CXXConstructorDecl *Ctor = VBaseDecl->getDefaultConstructor(Context); 1402 if (!Ctor) { 1403 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1404 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1405 << 0 << VBase->getType(); 1406 Diag(VBaseDecl->getLocation(), diag::note_previous_decl) 1407 << Context.getTagDeclType(VBaseDecl); 1408 HadError = true; 1409 continue; 1410 } 1411 1412 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1413 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1414 Constructor->getLocation(), CtorArgs)) 1415 continue; 1416 1417 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1418 1419 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1420 // subexpression so we can wrap it in a CXXExprWithTemporaries if 1421 // necessary. 1422 // FIXME: Is there any better source-location information we can give? 1423 ExprTemporaries.clear(); 1424 CXXBaseOrMemberInitializer *Member = 1425 new (Context) CXXBaseOrMemberInitializer(Context, 1426 Context.getTrivialTypeSourceInfo(VBase->getType(), 1427 SourceLocation()), 1428 Ctor, 1429 SourceLocation(), 1430 CtorArgs.takeAs<Expr>(), 1431 CtorArgs.size(), 1432 SourceLocation()); 1433 AllToInit.push_back(Member); 1434 } 1435 } 1436 1437 for (CXXRecordDecl::base_class_iterator Base = 1438 ClassDecl->bases_begin(), 1439 E = ClassDecl->bases_end(); Base != E; ++Base) { 1440 // Virtuals are in the virtual base list and already constructed. 1441 if (Base->isVirtual()) 1442 continue; 1443 // Skip dependent types. 1444 if (Base->getType()->isDependentType()) 1445 continue; 1446 if (CXXBaseOrMemberInitializer *Value 1447 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1448 AllToInit.push_back(Value); 1449 } 1450 else { 1451 CXXRecordDecl *BaseDecl = 1452 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1453 assert(BaseDecl && "SetBaseOrMemberInitializers - BaseDecl null"); 1454 CXXConstructorDecl *Ctor = BaseDecl->getDefaultConstructor(Context); 1455 if (!Ctor) { 1456 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1457 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1458 << 0 << Base->getType(); 1459 Diag(BaseDecl->getLocation(), diag::note_previous_decl) 1460 << Context.getTagDeclType(BaseDecl); 1461 HadError = true; 1462 continue; 1463 } 1464 1465 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1466 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1467 Constructor->getLocation(), CtorArgs)) 1468 continue; 1469 1470 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1471 1472 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1473 // subexpression so we can wrap it in a CXXExprWithTemporaries if 1474 // necessary. 1475 // FIXME: Is there any better source-location information we can give? 1476 ExprTemporaries.clear(); 1477 CXXBaseOrMemberInitializer *Member = 1478 new (Context) CXXBaseOrMemberInitializer(Context, 1479 Context.getTrivialTypeSourceInfo(Base->getType(), 1480 SourceLocation()), 1481 Ctor, 1482 SourceLocation(), 1483 CtorArgs.takeAs<Expr>(), 1484 CtorArgs.size(), 1485 SourceLocation()); 1486 AllToInit.push_back(Member); 1487 } 1488 } 1489 } 1490 1491 // non-static data members. 1492 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1493 E = ClassDecl->field_end(); Field != E; ++Field) { 1494 if ((*Field)->isAnonymousStructOrUnion()) { 1495 if (const RecordType *FieldClassType = 1496 Field->getType()->getAs<RecordType>()) { 1497 CXXRecordDecl *FieldClassDecl 1498 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1499 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1500 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1501 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1502 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1503 // set to the anonymous union data member used in the initializer 1504 // list. 1505 Value->setMember(*Field); 1506 Value->setAnonUnionMember(*FA); 1507 AllToInit.push_back(Value); 1508 break; 1509 } 1510 } 1511 } 1512 continue; 1513 } 1514 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1515 AllToInit.push_back(Value); 1516 continue; 1517 } 1518 1519 if ((*Field)->getType()->isDependentType()) 1520 continue; 1521 1522 QualType FT = Context.getBaseElementType((*Field)->getType()); 1523 if (const RecordType* RT = FT->getAs<RecordType>()) { 1524 CXXConstructorDecl *Ctor = 1525 cast<CXXRecordDecl>(RT->getDecl())->getDefaultConstructor(Context); 1526 if (!Ctor) { 1527 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1528 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1529 << 1 << (*Field)->getDeclName(); 1530 Diag(Field->getLocation(), diag::note_field_decl); 1531 Diag(RT->getDecl()->getLocation(), diag::note_previous_decl) 1532 << Context.getTagDeclType(RT->getDecl()); 1533 HadError = true; 1534 continue; 1535 } 1536 1537 if (FT.isConstQualified() && Ctor->isTrivial()) { 1538 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1539 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1540 << 1 << (*Field)->getDeclName(); 1541 Diag((*Field)->getLocation(), diag::note_declared_at); 1542 HadError = true; 1543 } 1544 1545 // Don't create initializers for trivial constructors, since they don't 1546 // actually need to be run. 1547 if (Ctor->isTrivial()) 1548 continue; 1549 1550 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1551 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1552 Constructor->getLocation(), CtorArgs)) 1553 continue; 1554 1555 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1556 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1557 ExprTemporaries.clear(); 1558 CXXBaseOrMemberInitializer *Member = 1559 new (Context) CXXBaseOrMemberInitializer(Context, 1560 *Field, SourceLocation(), 1561 Ctor, 1562 SourceLocation(), 1563 CtorArgs.takeAs<Expr>(), 1564 CtorArgs.size(), 1565 SourceLocation()); 1566 1567 AllToInit.push_back(Member); 1568 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1569 } 1570 else if (FT->isReferenceType()) { 1571 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1572 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1573 << 0 << (*Field)->getDeclName(); 1574 Diag((*Field)->getLocation(), diag::note_declared_at); 1575 HadError = true; 1576 } 1577 else if (FT.isConstQualified()) { 1578 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1579 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1580 << 1 << (*Field)->getDeclName(); 1581 Diag((*Field)->getLocation(), diag::note_declared_at); 1582 HadError = true; 1583 } 1584 } 1585 1586 NumInitializers = AllToInit.size(); 1587 if (NumInitializers > 0) { 1588 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1589 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1590 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1591 1592 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1593 for (unsigned Idx = 0; Idx < NumInitializers; ++Idx) 1594 baseOrMemberInitializers[Idx] = AllToInit[Idx]; 1595 } 1596 1597 return HadError; 1598} 1599 1600static void *GetKeyForTopLevelField(FieldDecl *Field) { 1601 // For anonymous unions, use the class declaration as the key. 1602 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1603 if (RT->getDecl()->isAnonymousStructOrUnion()) 1604 return static_cast<void *>(RT->getDecl()); 1605 } 1606 return static_cast<void *>(Field); 1607} 1608 1609static void *GetKeyForBase(QualType BaseType) { 1610 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1611 return (void *)RT; 1612 1613 assert(0 && "Unexpected base type!"); 1614 return 0; 1615} 1616 1617static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1618 bool MemberMaybeAnon = false) { 1619 // For fields injected into the class via declaration of an anonymous union, 1620 // use its anonymous union class declaration as the unique key. 1621 if (Member->isMemberInitializer()) { 1622 FieldDecl *Field = Member->getMember(); 1623 1624 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1625 // data member of the class. Data member used in the initializer list is 1626 // in AnonUnionMember field. 1627 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1628 Field = Member->getAnonUnionMember(); 1629 if (Field->getDeclContext()->isRecord()) { 1630 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 1631 if (RD->isAnonymousStructOrUnion()) 1632 return static_cast<void *>(RD); 1633 } 1634 return static_cast<void *>(Field); 1635 } 1636 1637 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1638} 1639 1640/// ActOnMemInitializers - Handle the member initializers for a constructor. 1641void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1642 SourceLocation ColonLoc, 1643 MemInitTy **MemInits, unsigned NumMemInits) { 1644 if (!ConstructorDecl) 1645 return; 1646 1647 AdjustDeclIfTemplate(ConstructorDecl); 1648 1649 CXXConstructorDecl *Constructor 1650 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1651 1652 if (!Constructor) { 1653 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1654 return; 1655 } 1656 1657 if (!Constructor->isDependentContext()) { 1658 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 1659 bool err = false; 1660 for (unsigned i = 0; i < NumMemInits; i++) { 1661 CXXBaseOrMemberInitializer *Member = 1662 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1663 void *KeyToMember = GetKeyForMember(Member); 1664 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1665 if (!PrevMember) { 1666 PrevMember = Member; 1667 continue; 1668 } 1669 if (FieldDecl *Field = Member->getMember()) 1670 Diag(Member->getSourceLocation(), 1671 diag::error_multiple_mem_initialization) 1672 << Field->getNameAsString() 1673 << Member->getSourceRange(); 1674 else { 1675 Type *BaseClass = Member->getBaseClass(); 1676 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1677 Diag(Member->getSourceLocation(), 1678 diag::error_multiple_base_initialization) 1679 << QualType(BaseClass, 0) 1680 << Member->getSourceRange(); 1681 } 1682 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1683 << 0; 1684 err = true; 1685 } 1686 1687 if (err) 1688 return; 1689 } 1690 1691 SetBaseOrMemberInitializers(Constructor, 1692 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 1693 NumMemInits, false); 1694 1695 if (Constructor->isDependentContext()) 1696 return; 1697 1698 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1699 Diagnostic::Ignored && 1700 Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1701 Diagnostic::Ignored) 1702 return; 1703 1704 // Also issue warning if order of ctor-initializer list does not match order 1705 // of 1) base class declarations and 2) order of non-static data members. 1706 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1707 1708 CXXRecordDecl *ClassDecl 1709 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1710 // Push virtual bases before others. 1711 for (CXXRecordDecl::base_class_iterator VBase = 1712 ClassDecl->vbases_begin(), 1713 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1714 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1715 1716 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1717 E = ClassDecl->bases_end(); Base != E; ++Base) { 1718 // Virtuals are alread in the virtual base list and are constructed 1719 // first. 1720 if (Base->isVirtual()) 1721 continue; 1722 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1723 } 1724 1725 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1726 E = ClassDecl->field_end(); Field != E; ++Field) 1727 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1728 1729 int Last = AllBaseOrMembers.size(); 1730 int curIndex = 0; 1731 CXXBaseOrMemberInitializer *PrevMember = 0; 1732 for (unsigned i = 0; i < NumMemInits; i++) { 1733 CXXBaseOrMemberInitializer *Member = 1734 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1735 void *MemberInCtorList = GetKeyForMember(Member, true); 1736 1737 for (; curIndex < Last; curIndex++) 1738 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1739 break; 1740 if (curIndex == Last) { 1741 assert(PrevMember && "Member not in member list?!"); 1742 // Initializer as specified in ctor-initializer list is out of order. 1743 // Issue a warning diagnostic. 1744 if (PrevMember->isBaseInitializer()) { 1745 // Diagnostics is for an initialized base class. 1746 Type *BaseClass = PrevMember->getBaseClass(); 1747 Diag(PrevMember->getSourceLocation(), 1748 diag::warn_base_initialized) 1749 << QualType(BaseClass, 0); 1750 } else { 1751 FieldDecl *Field = PrevMember->getMember(); 1752 Diag(PrevMember->getSourceLocation(), 1753 diag::warn_field_initialized) 1754 << Field->getNameAsString(); 1755 } 1756 // Also the note! 1757 if (FieldDecl *Field = Member->getMember()) 1758 Diag(Member->getSourceLocation(), 1759 diag::note_fieldorbase_initialized_here) << 0 1760 << Field->getNameAsString(); 1761 else { 1762 Type *BaseClass = Member->getBaseClass(); 1763 Diag(Member->getSourceLocation(), 1764 diag::note_fieldorbase_initialized_here) << 1 1765 << QualType(BaseClass, 0); 1766 } 1767 for (curIndex = 0; curIndex < Last; curIndex++) 1768 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1769 break; 1770 } 1771 PrevMember = Member; 1772 } 1773} 1774 1775void 1776Sema::MarkBaseAndMemberDestructorsReferenced(CXXDestructorDecl *Destructor) { 1777 // Ignore dependent destructors. 1778 if (Destructor->isDependentContext()) 1779 return; 1780 1781 CXXRecordDecl *ClassDecl = Destructor->getParent(); 1782 1783 // Non-static data members. 1784 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1785 E = ClassDecl->field_end(); I != E; ++I) { 1786 FieldDecl *Field = *I; 1787 1788 QualType FieldType = Context.getBaseElementType(Field->getType()); 1789 1790 const RecordType* RT = FieldType->getAs<RecordType>(); 1791 if (!RT) 1792 continue; 1793 1794 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1795 if (FieldClassDecl->hasTrivialDestructor()) 1796 continue; 1797 1798 const CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1799 MarkDeclarationReferenced(Destructor->getLocation(), 1800 const_cast<CXXDestructorDecl*>(Dtor)); 1801 } 1802 1803 // Bases. 1804 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1805 E = ClassDecl->bases_end(); Base != E; ++Base) { 1806 // Ignore virtual bases. 1807 if (Base->isVirtual()) 1808 continue; 1809 1810 // Ignore trivial destructors. 1811 CXXRecordDecl *BaseClassDecl 1812 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1813 if (BaseClassDecl->hasTrivialDestructor()) 1814 continue; 1815 1816 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1817 MarkDeclarationReferenced(Destructor->getLocation(), 1818 const_cast<CXXDestructorDecl*>(Dtor)); 1819 } 1820 1821 // Virtual bases. 1822 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1823 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1824 // Ignore trivial destructors. 1825 CXXRecordDecl *BaseClassDecl 1826 = cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1827 if (BaseClassDecl->hasTrivialDestructor()) 1828 continue; 1829 1830 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1831 MarkDeclarationReferenced(Destructor->getLocation(), 1832 const_cast<CXXDestructorDecl*>(Dtor)); 1833 } 1834} 1835 1836void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1837 if (!CDtorDecl) 1838 return; 1839 1840 AdjustDeclIfTemplate(CDtorDecl); 1841 1842 if (CXXConstructorDecl *Constructor 1843 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1844 SetBaseOrMemberInitializers(Constructor, 0, 0, false); 1845} 1846 1847namespace { 1848 /// PureVirtualMethodCollector - traverses a class and its superclasses 1849 /// and determines if it has any pure virtual methods. 1850 class PureVirtualMethodCollector { 1851 ASTContext &Context; 1852 1853 public: 1854 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1855 1856 private: 1857 MethodList Methods; 1858 1859 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1860 1861 public: 1862 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1863 : Context(Ctx) { 1864 1865 MethodList List; 1866 Collect(RD, List); 1867 1868 // Copy the temporary list to methods, and make sure to ignore any 1869 // null entries. 1870 for (size_t i = 0, e = List.size(); i != e; ++i) { 1871 if (List[i]) 1872 Methods.push_back(List[i]); 1873 } 1874 } 1875 1876 bool empty() const { return Methods.empty(); } 1877 1878 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1879 MethodList::const_iterator methods_end() { return Methods.end(); } 1880 }; 1881 1882 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1883 MethodList& Methods) { 1884 // First, collect the pure virtual methods for the base classes. 1885 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1886 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1887 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1888 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1889 if (BaseDecl && BaseDecl->isAbstract()) 1890 Collect(BaseDecl, Methods); 1891 } 1892 } 1893 1894 // Next, zero out any pure virtual methods that this class overrides. 1895 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1896 1897 MethodSetTy OverriddenMethods; 1898 size_t MethodsSize = Methods.size(); 1899 1900 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1901 i != e; ++i) { 1902 // Traverse the record, looking for methods. 1903 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1904 // If the method is pure virtual, add it to the methods vector. 1905 if (MD->isPure()) 1906 Methods.push_back(MD); 1907 1908 // Record all the overridden methods in our set. 1909 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1910 E = MD->end_overridden_methods(); I != E; ++I) { 1911 // Keep track of the overridden methods. 1912 OverriddenMethods.insert(*I); 1913 } 1914 } 1915 } 1916 1917 // Now go through the methods and zero out all the ones we know are 1918 // overridden. 1919 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1920 if (OverriddenMethods.count(Methods[i])) 1921 Methods[i] = 0; 1922 } 1923 1924 } 1925} 1926 1927 1928bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1929 unsigned DiagID, AbstractDiagSelID SelID, 1930 const CXXRecordDecl *CurrentRD) { 1931 if (SelID == -1) 1932 return RequireNonAbstractType(Loc, T, 1933 PDiag(DiagID), CurrentRD); 1934 else 1935 return RequireNonAbstractType(Loc, T, 1936 PDiag(DiagID) << SelID, CurrentRD); 1937} 1938 1939bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1940 const PartialDiagnostic &PD, 1941 const CXXRecordDecl *CurrentRD) { 1942 if (!getLangOptions().CPlusPlus) 1943 return false; 1944 1945 if (const ArrayType *AT = Context.getAsArrayType(T)) 1946 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 1947 CurrentRD); 1948 1949 if (const PointerType *PT = T->getAs<PointerType>()) { 1950 // Find the innermost pointer type. 1951 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1952 PT = T; 1953 1954 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1955 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 1956 } 1957 1958 const RecordType *RT = T->getAs<RecordType>(); 1959 if (!RT) 1960 return false; 1961 1962 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1963 if (!RD) 1964 return false; 1965 1966 if (CurrentRD && CurrentRD != RD) 1967 return false; 1968 1969 if (!RD->isAbstract()) 1970 return false; 1971 1972 Diag(Loc, PD) << RD->getDeclName(); 1973 1974 // Check if we've already emitted the list of pure virtual functions for this 1975 // class. 1976 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1977 return true; 1978 1979 PureVirtualMethodCollector Collector(Context, RD); 1980 1981 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1982 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1983 const CXXMethodDecl *MD = *I; 1984 1985 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1986 MD->getDeclName(); 1987 } 1988 1989 if (!PureVirtualClassDiagSet) 1990 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1991 PureVirtualClassDiagSet->insert(RD); 1992 1993 return true; 1994} 1995 1996namespace { 1997 class AbstractClassUsageDiagnoser 1998 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1999 Sema &SemaRef; 2000 CXXRecordDecl *AbstractClass; 2001 2002 bool VisitDeclContext(const DeclContext *DC) { 2003 bool Invalid = false; 2004 2005 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2006 E = DC->decls_end(); I != E; ++I) 2007 Invalid |= Visit(*I); 2008 2009 return Invalid; 2010 } 2011 2012 public: 2013 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2014 : SemaRef(SemaRef), AbstractClass(ac) { 2015 Visit(SemaRef.Context.getTranslationUnitDecl()); 2016 } 2017 2018 bool VisitFunctionDecl(const FunctionDecl *FD) { 2019 if (FD->isThisDeclarationADefinition()) { 2020 // No need to do the check if we're in a definition, because it requires 2021 // that the return/param types are complete. 2022 // because that requires 2023 return VisitDeclContext(FD); 2024 } 2025 2026 // Check the return type. 2027 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2028 bool Invalid = 2029 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2030 diag::err_abstract_type_in_decl, 2031 Sema::AbstractReturnType, 2032 AbstractClass); 2033 2034 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2035 E = FD->param_end(); I != E; ++I) { 2036 const ParmVarDecl *VD = *I; 2037 Invalid |= 2038 SemaRef.RequireNonAbstractType(VD->getLocation(), 2039 VD->getOriginalType(), 2040 diag::err_abstract_type_in_decl, 2041 Sema::AbstractParamType, 2042 AbstractClass); 2043 } 2044 2045 return Invalid; 2046 } 2047 2048 bool VisitDecl(const Decl* D) { 2049 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2050 return VisitDeclContext(DC); 2051 2052 return false; 2053 } 2054 }; 2055} 2056 2057/// \brief Perform semantic checks on a class definition that has been 2058/// completing, introducing implicitly-declared members, checking for 2059/// abstract types, etc. 2060void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2061 if (!Record || Record->isInvalidDecl()) 2062 return; 2063 2064 if (!Record->isDependentType()) 2065 AddImplicitlyDeclaredMembersToClass(Record); 2066 2067 if (Record->isInvalidDecl()) 2068 return; 2069 2070 if (!Record->isAbstract()) { 2071 // Collect all the pure virtual methods and see if this is an abstract 2072 // class after all. 2073 PureVirtualMethodCollector Collector(Context, Record); 2074 if (!Collector.empty()) 2075 Record->setAbstract(true); 2076 } 2077 2078 if (Record->isAbstract()) 2079 (void)AbstractClassUsageDiagnoser(*this, Record); 2080} 2081 2082void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2083 DeclPtrTy TagDecl, 2084 SourceLocation LBrac, 2085 SourceLocation RBrac) { 2086 if (!TagDecl) 2087 return; 2088 2089 AdjustDeclIfTemplate(TagDecl); 2090 2091 ActOnFields(S, RLoc, TagDecl, 2092 (DeclPtrTy*)FieldCollector->getCurFields(), 2093 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 2094 2095 CheckCompletedCXXClass( 2096 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2097} 2098 2099/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2100/// special functions, such as the default constructor, copy 2101/// constructor, or destructor, to the given C++ class (C++ 2102/// [special]p1). This routine can only be executed just before the 2103/// definition of the class is complete. 2104void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2105 CanQualType ClassType 2106 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2107 2108 // FIXME: Implicit declarations have exception specifications, which are 2109 // the union of the specifications of the implicitly called functions. 2110 2111 if (!ClassDecl->hasUserDeclaredConstructor()) { 2112 // C++ [class.ctor]p5: 2113 // A default constructor for a class X is a constructor of class X 2114 // that can be called without an argument. If there is no 2115 // user-declared constructor for class X, a default constructor is 2116 // implicitly declared. An implicitly-declared default constructor 2117 // is an inline public member of its class. 2118 DeclarationName Name 2119 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2120 CXXConstructorDecl *DefaultCon = 2121 CXXConstructorDecl::Create(Context, ClassDecl, 2122 ClassDecl->getLocation(), Name, 2123 Context.getFunctionType(Context.VoidTy, 2124 0, 0, false, 0), 2125 /*TInfo=*/0, 2126 /*isExplicit=*/false, 2127 /*isInline=*/true, 2128 /*isImplicitlyDeclared=*/true); 2129 DefaultCon->setAccess(AS_public); 2130 DefaultCon->setImplicit(); 2131 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2132 ClassDecl->addDecl(DefaultCon); 2133 } 2134 2135 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2136 // C++ [class.copy]p4: 2137 // If the class definition does not explicitly declare a copy 2138 // constructor, one is declared implicitly. 2139 2140 // C++ [class.copy]p5: 2141 // The implicitly-declared copy constructor for a class X will 2142 // have the form 2143 // 2144 // X::X(const X&) 2145 // 2146 // if 2147 bool HasConstCopyConstructor = true; 2148 2149 // -- each direct or virtual base class B of X has a copy 2150 // constructor whose first parameter is of type const B& or 2151 // const volatile B&, and 2152 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2153 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2154 const CXXRecordDecl *BaseClassDecl 2155 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2156 HasConstCopyConstructor 2157 = BaseClassDecl->hasConstCopyConstructor(Context); 2158 } 2159 2160 // -- for all the nonstatic data members of X that are of a 2161 // class type M (or array thereof), each such class type 2162 // has a copy constructor whose first parameter is of type 2163 // const M& or const volatile M&. 2164 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2165 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2166 ++Field) { 2167 QualType FieldType = (*Field)->getType(); 2168 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2169 FieldType = Array->getElementType(); 2170 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2171 const CXXRecordDecl *FieldClassDecl 2172 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2173 HasConstCopyConstructor 2174 = FieldClassDecl->hasConstCopyConstructor(Context); 2175 } 2176 } 2177 2178 // Otherwise, the implicitly declared copy constructor will have 2179 // the form 2180 // 2181 // X::X(X&) 2182 QualType ArgType = ClassType; 2183 if (HasConstCopyConstructor) 2184 ArgType = ArgType.withConst(); 2185 ArgType = Context.getLValueReferenceType(ArgType); 2186 2187 // An implicitly-declared copy constructor is an inline public 2188 // member of its class. 2189 DeclarationName Name 2190 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2191 CXXConstructorDecl *CopyConstructor 2192 = CXXConstructorDecl::Create(Context, ClassDecl, 2193 ClassDecl->getLocation(), Name, 2194 Context.getFunctionType(Context.VoidTy, 2195 &ArgType, 1, 2196 false, 0), 2197 /*TInfo=*/0, 2198 /*isExplicit=*/false, 2199 /*isInline=*/true, 2200 /*isImplicitlyDeclared=*/true); 2201 CopyConstructor->setAccess(AS_public); 2202 CopyConstructor->setImplicit(); 2203 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2204 2205 // Add the parameter to the constructor. 2206 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2207 ClassDecl->getLocation(), 2208 /*IdentifierInfo=*/0, 2209 ArgType, /*TInfo=*/0, 2210 VarDecl::None, 0); 2211 CopyConstructor->setParams(Context, &FromParam, 1); 2212 ClassDecl->addDecl(CopyConstructor); 2213 } 2214 2215 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2216 // Note: The following rules are largely analoguous to the copy 2217 // constructor rules. Note that virtual bases are not taken into account 2218 // for determining the argument type of the operator. Note also that 2219 // operators taking an object instead of a reference are allowed. 2220 // 2221 // C++ [class.copy]p10: 2222 // If the class definition does not explicitly declare a copy 2223 // assignment operator, one is declared implicitly. 2224 // The implicitly-defined copy assignment operator for a class X 2225 // will have the form 2226 // 2227 // X& X::operator=(const X&) 2228 // 2229 // if 2230 bool HasConstCopyAssignment = true; 2231 2232 // -- each direct base class B of X has a copy assignment operator 2233 // whose parameter is of type const B&, const volatile B& or B, 2234 // and 2235 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2236 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2237 assert(!Base->getType()->isDependentType() && 2238 "Cannot generate implicit members for class with dependent bases."); 2239 const CXXRecordDecl *BaseClassDecl 2240 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2241 const CXXMethodDecl *MD = 0; 2242 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2243 MD); 2244 } 2245 2246 // -- for all the nonstatic data members of X that are of a class 2247 // type M (or array thereof), each such class type has a copy 2248 // assignment operator whose parameter is of type const M&, 2249 // const volatile M& or M. 2250 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2251 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2252 ++Field) { 2253 QualType FieldType = (*Field)->getType(); 2254 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2255 FieldType = Array->getElementType(); 2256 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2257 const CXXRecordDecl *FieldClassDecl 2258 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2259 const CXXMethodDecl *MD = 0; 2260 HasConstCopyAssignment 2261 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2262 } 2263 } 2264 2265 // Otherwise, the implicitly declared copy assignment operator will 2266 // have the form 2267 // 2268 // X& X::operator=(X&) 2269 QualType ArgType = ClassType; 2270 QualType RetType = Context.getLValueReferenceType(ArgType); 2271 if (HasConstCopyAssignment) 2272 ArgType = ArgType.withConst(); 2273 ArgType = Context.getLValueReferenceType(ArgType); 2274 2275 // An implicitly-declared copy assignment operator is an inline public 2276 // member of its class. 2277 DeclarationName Name = 2278 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2279 CXXMethodDecl *CopyAssignment = 2280 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2281 Context.getFunctionType(RetType, &ArgType, 1, 2282 false, 0), 2283 /*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2284 CopyAssignment->setAccess(AS_public); 2285 CopyAssignment->setImplicit(); 2286 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2287 CopyAssignment->setCopyAssignment(true); 2288 2289 // Add the parameter to the operator. 2290 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2291 ClassDecl->getLocation(), 2292 /*IdentifierInfo=*/0, 2293 ArgType, /*TInfo=*/0, 2294 VarDecl::None, 0); 2295 CopyAssignment->setParams(Context, &FromParam, 1); 2296 2297 // Don't call addedAssignmentOperator. There is no way to distinguish an 2298 // implicit from an explicit assignment operator. 2299 ClassDecl->addDecl(CopyAssignment); 2300 AddOverriddenMethods(ClassDecl, CopyAssignment); 2301 } 2302 2303 if (!ClassDecl->hasUserDeclaredDestructor()) { 2304 // C++ [class.dtor]p2: 2305 // If a class has no user-declared destructor, a destructor is 2306 // declared implicitly. An implicitly-declared destructor is an 2307 // inline public member of its class. 2308 DeclarationName Name 2309 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2310 CXXDestructorDecl *Destructor 2311 = CXXDestructorDecl::Create(Context, ClassDecl, 2312 ClassDecl->getLocation(), Name, 2313 Context.getFunctionType(Context.VoidTy, 2314 0, 0, false, 0), 2315 /*isInline=*/true, 2316 /*isImplicitlyDeclared=*/true); 2317 Destructor->setAccess(AS_public); 2318 Destructor->setImplicit(); 2319 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2320 ClassDecl->addDecl(Destructor); 2321 2322 AddOverriddenMethods(ClassDecl, Destructor); 2323 } 2324} 2325 2326void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2327 Decl *D = TemplateD.getAs<Decl>(); 2328 if (!D) 2329 return; 2330 2331 TemplateParameterList *Params = 0; 2332 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2333 Params = Template->getTemplateParameters(); 2334 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2335 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2336 Params = PartialSpec->getTemplateParameters(); 2337 else 2338 return; 2339 2340 for (TemplateParameterList::iterator Param = Params->begin(), 2341 ParamEnd = Params->end(); 2342 Param != ParamEnd; ++Param) { 2343 NamedDecl *Named = cast<NamedDecl>(*Param); 2344 if (Named->getDeclName()) { 2345 S->AddDecl(DeclPtrTy::make(Named)); 2346 IdResolver.AddDecl(Named); 2347 } 2348 } 2349} 2350 2351void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2352 if (!RecordD) return; 2353 AdjustDeclIfTemplate(RecordD); 2354 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2355 PushDeclContext(S, Record); 2356} 2357 2358void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2359 if (!RecordD) return; 2360 PopDeclContext(); 2361} 2362 2363/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2364/// parsing a top-level (non-nested) C++ class, and we are now 2365/// parsing those parts of the given Method declaration that could 2366/// not be parsed earlier (C++ [class.mem]p2), such as default 2367/// arguments. This action should enter the scope of the given 2368/// Method declaration as if we had just parsed the qualified method 2369/// name. However, it should not bring the parameters into scope; 2370/// that will be performed by ActOnDelayedCXXMethodParameter. 2371void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2372} 2373 2374/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2375/// C++ method declaration. We're (re-)introducing the given 2376/// function parameter into scope for use in parsing later parts of 2377/// the method declaration. For example, we could see an 2378/// ActOnParamDefaultArgument event for this parameter. 2379void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2380 if (!ParamD) 2381 return; 2382 2383 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2384 2385 // If this parameter has an unparsed default argument, clear it out 2386 // to make way for the parsed default argument. 2387 if (Param->hasUnparsedDefaultArg()) 2388 Param->setDefaultArg(0); 2389 2390 S->AddDecl(DeclPtrTy::make(Param)); 2391 if (Param->getDeclName()) 2392 IdResolver.AddDecl(Param); 2393} 2394 2395/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2396/// processing the delayed method declaration for Method. The method 2397/// declaration is now considered finished. There may be a separate 2398/// ActOnStartOfFunctionDef action later (not necessarily 2399/// immediately!) for this method, if it was also defined inside the 2400/// class body. 2401void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2402 if (!MethodD) 2403 return; 2404 2405 AdjustDeclIfTemplate(MethodD); 2406 2407 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2408 2409 // Now that we have our default arguments, check the constructor 2410 // again. It could produce additional diagnostics or affect whether 2411 // the class has implicitly-declared destructors, among other 2412 // things. 2413 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2414 CheckConstructor(Constructor); 2415 2416 // Check the default arguments, which we may have added. 2417 if (!Method->isInvalidDecl()) 2418 CheckCXXDefaultArguments(Method); 2419} 2420 2421/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2422/// the well-formedness of the constructor declarator @p D with type @p 2423/// R. If there are any errors in the declarator, this routine will 2424/// emit diagnostics and set the invalid bit to true. In any case, the type 2425/// will be updated to reflect a well-formed type for the constructor and 2426/// returned. 2427QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2428 FunctionDecl::StorageClass &SC) { 2429 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2430 2431 // C++ [class.ctor]p3: 2432 // A constructor shall not be virtual (10.3) or static (9.4). A 2433 // constructor can be invoked for a const, volatile or const 2434 // volatile object. A constructor shall not be declared const, 2435 // volatile, or const volatile (9.3.2). 2436 if (isVirtual) { 2437 if (!D.isInvalidType()) 2438 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2439 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2440 << SourceRange(D.getIdentifierLoc()); 2441 D.setInvalidType(); 2442 } 2443 if (SC == FunctionDecl::Static) { 2444 if (!D.isInvalidType()) 2445 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2446 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2447 << SourceRange(D.getIdentifierLoc()); 2448 D.setInvalidType(); 2449 SC = FunctionDecl::None; 2450 } 2451 2452 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2453 if (FTI.TypeQuals != 0) { 2454 if (FTI.TypeQuals & Qualifiers::Const) 2455 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2456 << "const" << SourceRange(D.getIdentifierLoc()); 2457 if (FTI.TypeQuals & Qualifiers::Volatile) 2458 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2459 << "volatile" << SourceRange(D.getIdentifierLoc()); 2460 if (FTI.TypeQuals & Qualifiers::Restrict) 2461 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2462 << "restrict" << SourceRange(D.getIdentifierLoc()); 2463 } 2464 2465 // Rebuild the function type "R" without any type qualifiers (in 2466 // case any of the errors above fired) and with "void" as the 2467 // return type, since constructors don't have return types. We 2468 // *always* have to do this, because GetTypeForDeclarator will 2469 // put in a result type of "int" when none was specified. 2470 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2471 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2472 Proto->getNumArgs(), 2473 Proto->isVariadic(), 0); 2474} 2475 2476/// CheckConstructor - Checks a fully-formed constructor for 2477/// well-formedness, issuing any diagnostics required. Returns true if 2478/// the constructor declarator is invalid. 2479void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2480 CXXRecordDecl *ClassDecl 2481 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2482 if (!ClassDecl) 2483 return Constructor->setInvalidDecl(); 2484 2485 // C++ [class.copy]p3: 2486 // A declaration of a constructor for a class X is ill-formed if 2487 // its first parameter is of type (optionally cv-qualified) X and 2488 // either there are no other parameters or else all other 2489 // parameters have default arguments. 2490 if (!Constructor->isInvalidDecl() && 2491 ((Constructor->getNumParams() == 1) || 2492 (Constructor->getNumParams() > 1 && 2493 Constructor->getParamDecl(1)->hasDefaultArg())) && 2494 Constructor->getTemplateSpecializationKind() 2495 != TSK_ImplicitInstantiation) { 2496 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2497 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2498 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2499 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2500 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2501 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 2502 2503 // FIXME: Rather that making the constructor invalid, we should endeavor 2504 // to fix the type. 2505 Constructor->setInvalidDecl(); 2506 } 2507 } 2508 2509 // Notify the class that we've added a constructor. 2510 ClassDecl->addedConstructor(Context, Constructor); 2511} 2512 2513/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2514/// issuing any diagnostics required. Returns true on error. 2515bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2516 CXXRecordDecl *RD = Destructor->getParent(); 2517 2518 if (Destructor->isVirtual()) { 2519 SourceLocation Loc; 2520 2521 if (!Destructor->isImplicit()) 2522 Loc = Destructor->getLocation(); 2523 else 2524 Loc = RD->getLocation(); 2525 2526 // If we have a virtual destructor, look up the deallocation function 2527 FunctionDecl *OperatorDelete = 0; 2528 DeclarationName Name = 2529 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2530 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2531 return true; 2532 2533 Destructor->setOperatorDelete(OperatorDelete); 2534 } 2535 2536 return false; 2537} 2538 2539static inline bool 2540FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2541 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2542 FTI.ArgInfo[0].Param && 2543 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2544} 2545 2546/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2547/// the well-formednes of the destructor declarator @p D with type @p 2548/// R. If there are any errors in the declarator, this routine will 2549/// emit diagnostics and set the declarator to invalid. Even if this happens, 2550/// will be updated to reflect a well-formed type for the destructor and 2551/// returned. 2552QualType Sema::CheckDestructorDeclarator(Declarator &D, 2553 FunctionDecl::StorageClass& SC) { 2554 // C++ [class.dtor]p1: 2555 // [...] A typedef-name that names a class is a class-name 2556 // (7.1.3); however, a typedef-name that names a class shall not 2557 // be used as the identifier in the declarator for a destructor 2558 // declaration. 2559 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2560 if (isa<TypedefType>(DeclaratorType)) { 2561 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2562 << DeclaratorType; 2563 D.setInvalidType(); 2564 } 2565 2566 // C++ [class.dtor]p2: 2567 // A destructor is used to destroy objects of its class type. A 2568 // destructor takes no parameters, and no return type can be 2569 // specified for it (not even void). The address of a destructor 2570 // shall not be taken. A destructor shall not be static. A 2571 // destructor can be invoked for a const, volatile or const 2572 // volatile object. A destructor shall not be declared const, 2573 // volatile or const volatile (9.3.2). 2574 if (SC == FunctionDecl::Static) { 2575 if (!D.isInvalidType()) 2576 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2577 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2578 << SourceRange(D.getIdentifierLoc()); 2579 SC = FunctionDecl::None; 2580 D.setInvalidType(); 2581 } 2582 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2583 // Destructors don't have return types, but the parser will 2584 // happily parse something like: 2585 // 2586 // class X { 2587 // float ~X(); 2588 // }; 2589 // 2590 // The return type will be eliminated later. 2591 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2592 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2593 << SourceRange(D.getIdentifierLoc()); 2594 } 2595 2596 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2597 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2598 if (FTI.TypeQuals & Qualifiers::Const) 2599 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2600 << "const" << SourceRange(D.getIdentifierLoc()); 2601 if (FTI.TypeQuals & Qualifiers::Volatile) 2602 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2603 << "volatile" << SourceRange(D.getIdentifierLoc()); 2604 if (FTI.TypeQuals & Qualifiers::Restrict) 2605 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2606 << "restrict" << SourceRange(D.getIdentifierLoc()); 2607 D.setInvalidType(); 2608 } 2609 2610 // Make sure we don't have any parameters. 2611 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2612 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2613 2614 // Delete the parameters. 2615 FTI.freeArgs(); 2616 D.setInvalidType(); 2617 } 2618 2619 // Make sure the destructor isn't variadic. 2620 if (FTI.isVariadic) { 2621 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2622 D.setInvalidType(); 2623 } 2624 2625 // Rebuild the function type "R" without any type qualifiers or 2626 // parameters (in case any of the errors above fired) and with 2627 // "void" as the return type, since destructors don't have return 2628 // types. We *always* have to do this, because GetTypeForDeclarator 2629 // will put in a result type of "int" when none was specified. 2630 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 2631} 2632 2633/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2634/// well-formednes of the conversion function declarator @p D with 2635/// type @p R. If there are any errors in the declarator, this routine 2636/// will emit diagnostics and return true. Otherwise, it will return 2637/// false. Either way, the type @p R will be updated to reflect a 2638/// well-formed type for the conversion operator. 2639void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2640 FunctionDecl::StorageClass& SC) { 2641 // C++ [class.conv.fct]p1: 2642 // Neither parameter types nor return type can be specified. The 2643 // type of a conversion function (8.3.5) is "function taking no 2644 // parameter returning conversion-type-id." 2645 if (SC == FunctionDecl::Static) { 2646 if (!D.isInvalidType()) 2647 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2648 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2649 << SourceRange(D.getIdentifierLoc()); 2650 D.setInvalidType(); 2651 SC = FunctionDecl::None; 2652 } 2653 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2654 // Conversion functions don't have return types, but the parser will 2655 // happily parse something like: 2656 // 2657 // class X { 2658 // float operator bool(); 2659 // }; 2660 // 2661 // The return type will be changed later anyway. 2662 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2663 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2664 << SourceRange(D.getIdentifierLoc()); 2665 } 2666 2667 // Make sure we don't have any parameters. 2668 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2669 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2670 2671 // Delete the parameters. 2672 D.getTypeObject(0).Fun.freeArgs(); 2673 D.setInvalidType(); 2674 } 2675 2676 // Make sure the conversion function isn't variadic. 2677 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2678 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2679 D.setInvalidType(); 2680 } 2681 2682 // C++ [class.conv.fct]p4: 2683 // The conversion-type-id shall not represent a function type nor 2684 // an array type. 2685 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2686 if (ConvType->isArrayType()) { 2687 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2688 ConvType = Context.getPointerType(ConvType); 2689 D.setInvalidType(); 2690 } else if (ConvType->isFunctionType()) { 2691 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2692 ConvType = Context.getPointerType(ConvType); 2693 D.setInvalidType(); 2694 } 2695 2696 // Rebuild the function type "R" without any parameters (in case any 2697 // of the errors above fired) and with the conversion type as the 2698 // return type. 2699 R = Context.getFunctionType(ConvType, 0, 0, false, 2700 R->getAs<FunctionProtoType>()->getTypeQuals()); 2701 2702 // C++0x explicit conversion operators. 2703 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2704 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2705 diag::warn_explicit_conversion_functions) 2706 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2707} 2708 2709/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2710/// the declaration of the given C++ conversion function. This routine 2711/// is responsible for recording the conversion function in the C++ 2712/// class, if possible. 2713Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2714 assert(Conversion && "Expected to receive a conversion function declaration"); 2715 2716 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2717 2718 // Make sure we aren't redeclaring the conversion function. 2719 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2720 2721 // C++ [class.conv.fct]p1: 2722 // [...] A conversion function is never used to convert a 2723 // (possibly cv-qualified) object to the (possibly cv-qualified) 2724 // same object type (or a reference to it), to a (possibly 2725 // cv-qualified) base class of that type (or a reference to it), 2726 // or to (possibly cv-qualified) void. 2727 // FIXME: Suppress this warning if the conversion function ends up being a 2728 // virtual function that overrides a virtual function in a base class. 2729 QualType ClassType 2730 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2731 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2732 ConvType = ConvTypeRef->getPointeeType(); 2733 if (ConvType->isRecordType()) { 2734 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2735 if (ConvType == ClassType) 2736 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2737 << ClassType; 2738 else if (IsDerivedFrom(ClassType, ConvType)) 2739 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2740 << ClassType << ConvType; 2741 } else if (ConvType->isVoidType()) { 2742 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2743 << ClassType << ConvType; 2744 } 2745 2746 if (Conversion->getPreviousDeclaration()) { 2747 const NamedDecl *ExpectedPrevDecl = Conversion->getPreviousDeclaration(); 2748 if (FunctionTemplateDecl *ConversionTemplate 2749 = Conversion->getDescribedFunctionTemplate()) 2750 ExpectedPrevDecl = ConversionTemplate->getPreviousDeclaration(); 2751 if (ClassDecl->replaceConversion(ExpectedPrevDecl, Conversion)) 2752 return DeclPtrTy::make(Conversion); 2753 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2754 } else if (FunctionTemplateDecl *ConversionTemplate 2755 = Conversion->getDescribedFunctionTemplate()) 2756 ClassDecl->addConversionFunction(ConversionTemplate); 2757 else if (!Conversion->getPrimaryTemplate()) // ignore specializations 2758 ClassDecl->addConversionFunction(Conversion); 2759 2760 return DeclPtrTy::make(Conversion); 2761} 2762 2763//===----------------------------------------------------------------------===// 2764// Namespace Handling 2765//===----------------------------------------------------------------------===// 2766 2767/// ActOnStartNamespaceDef - This is called at the start of a namespace 2768/// definition. 2769Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2770 SourceLocation IdentLoc, 2771 IdentifierInfo *II, 2772 SourceLocation LBrace) { 2773 NamespaceDecl *Namespc = 2774 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2775 Namespc->setLBracLoc(LBrace); 2776 2777 Scope *DeclRegionScope = NamespcScope->getParent(); 2778 2779 if (II) { 2780 // C++ [namespace.def]p2: 2781 // The identifier in an original-namespace-definition shall not have been 2782 // previously defined in the declarative region in which the 2783 // original-namespace-definition appears. The identifier in an 2784 // original-namespace-definition is the name of the namespace. Subsequently 2785 // in that declarative region, it is treated as an original-namespace-name. 2786 2787 NamedDecl *PrevDecl 2788 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2789 ForRedeclaration); 2790 2791 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2792 // This is an extended namespace definition. 2793 // Attach this namespace decl to the chain of extended namespace 2794 // definitions. 2795 OrigNS->setNextNamespace(Namespc); 2796 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2797 2798 // Remove the previous declaration from the scope. 2799 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2800 IdResolver.RemoveDecl(OrigNS); 2801 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2802 } 2803 } else if (PrevDecl) { 2804 // This is an invalid name redefinition. 2805 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2806 << Namespc->getDeclName(); 2807 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2808 Namespc->setInvalidDecl(); 2809 // Continue on to push Namespc as current DeclContext and return it. 2810 } else if (II->isStr("std") && 2811 CurContext->getLookupContext()->isTranslationUnit()) { 2812 // This is the first "real" definition of the namespace "std", so update 2813 // our cache of the "std" namespace to point at this definition. 2814 if (StdNamespace) { 2815 // We had already defined a dummy namespace "std". Link this new 2816 // namespace definition to the dummy namespace "std". 2817 StdNamespace->setNextNamespace(Namespc); 2818 StdNamespace->setLocation(IdentLoc); 2819 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2820 } 2821 2822 // Make our StdNamespace cache point at the first real definition of the 2823 // "std" namespace. 2824 StdNamespace = Namespc; 2825 } 2826 2827 PushOnScopeChains(Namespc, DeclRegionScope); 2828 } else { 2829 // Anonymous namespaces. 2830 assert(Namespc->isAnonymousNamespace()); 2831 CurContext->addDecl(Namespc); 2832 2833 // Link the anonymous namespace into its parent. 2834 NamespaceDecl *PrevDecl; 2835 DeclContext *Parent = CurContext->getLookupContext(); 2836 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 2837 PrevDecl = TU->getAnonymousNamespace(); 2838 TU->setAnonymousNamespace(Namespc); 2839 } else { 2840 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 2841 PrevDecl = ND->getAnonymousNamespace(); 2842 ND->setAnonymousNamespace(Namespc); 2843 } 2844 2845 // Link the anonymous namespace with its previous declaration. 2846 if (PrevDecl) { 2847 assert(PrevDecl->isAnonymousNamespace()); 2848 assert(!PrevDecl->getNextNamespace()); 2849 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 2850 PrevDecl->setNextNamespace(Namespc); 2851 } 2852 2853 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2854 // behaves as if it were replaced by 2855 // namespace unique { /* empty body */ } 2856 // using namespace unique; 2857 // namespace unique { namespace-body } 2858 // where all occurrences of 'unique' in a translation unit are 2859 // replaced by the same identifier and this identifier differs 2860 // from all other identifiers in the entire program. 2861 2862 // We just create the namespace with an empty name and then add an 2863 // implicit using declaration, just like the standard suggests. 2864 // 2865 // CodeGen enforces the "universally unique" aspect by giving all 2866 // declarations semantically contained within an anonymous 2867 // namespace internal linkage. 2868 2869 if (!PrevDecl) { 2870 UsingDirectiveDecl* UD 2871 = UsingDirectiveDecl::Create(Context, CurContext, 2872 /* 'using' */ LBrace, 2873 /* 'namespace' */ SourceLocation(), 2874 /* qualifier */ SourceRange(), 2875 /* NNS */ NULL, 2876 /* identifier */ SourceLocation(), 2877 Namespc, 2878 /* Ancestor */ CurContext); 2879 UD->setImplicit(); 2880 CurContext->addDecl(UD); 2881 } 2882 } 2883 2884 // Although we could have an invalid decl (i.e. the namespace name is a 2885 // redefinition), push it as current DeclContext and try to continue parsing. 2886 // FIXME: We should be able to push Namespc here, so that the each DeclContext 2887 // for the namespace has the declarations that showed up in that particular 2888 // namespace definition. 2889 PushDeclContext(NamespcScope, Namespc); 2890 return DeclPtrTy::make(Namespc); 2891} 2892 2893/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2894/// is a namespace alias, returns the namespace it points to. 2895static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2896 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2897 return AD->getNamespace(); 2898 return dyn_cast_or_null<NamespaceDecl>(D); 2899} 2900 2901/// ActOnFinishNamespaceDef - This callback is called after a namespace is 2902/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 2903void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 2904 Decl *Dcl = D.getAs<Decl>(); 2905 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 2906 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 2907 Namespc->setRBracLoc(RBrace); 2908 PopDeclContext(); 2909} 2910 2911Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 2912 SourceLocation UsingLoc, 2913 SourceLocation NamespcLoc, 2914 const CXXScopeSpec &SS, 2915 SourceLocation IdentLoc, 2916 IdentifierInfo *NamespcName, 2917 AttributeList *AttrList) { 2918 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2919 assert(NamespcName && "Invalid NamespcName."); 2920 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 2921 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2922 2923 UsingDirectiveDecl *UDir = 0; 2924 2925 // Lookup namespace name. 2926 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 2927 LookupParsedName(R, S, &SS); 2928 if (R.isAmbiguous()) 2929 return DeclPtrTy(); 2930 2931 if (!R.empty()) { 2932 NamedDecl *Named = R.getFoundDecl(); 2933 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 2934 && "expected namespace decl"); 2935 // C++ [namespace.udir]p1: 2936 // A using-directive specifies that the names in the nominated 2937 // namespace can be used in the scope in which the 2938 // using-directive appears after the using-directive. During 2939 // unqualified name lookup (3.4.1), the names appear as if they 2940 // were declared in the nearest enclosing namespace which 2941 // contains both the using-directive and the nominated 2942 // namespace. [Note: in this context, "contains" means "contains 2943 // directly or indirectly". ] 2944 2945 // Find enclosing context containing both using-directive and 2946 // nominated namespace. 2947 NamespaceDecl *NS = getNamespaceDecl(Named); 2948 DeclContext *CommonAncestor = cast<DeclContext>(NS); 2949 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 2950 CommonAncestor = CommonAncestor->getParent(); 2951 2952 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 2953 SS.getRange(), 2954 (NestedNameSpecifier *)SS.getScopeRep(), 2955 IdentLoc, Named, CommonAncestor); 2956 PushUsingDirective(S, UDir); 2957 } else { 2958 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 2959 } 2960 2961 // FIXME: We ignore attributes for now. 2962 delete AttrList; 2963 return DeclPtrTy::make(UDir); 2964} 2965 2966void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2967 // If scope has associated entity, then using directive is at namespace 2968 // or translation unit scope. We add UsingDirectiveDecls, into 2969 // it's lookup structure. 2970 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2971 Ctx->addDecl(UDir); 2972 else 2973 // Otherwise it is block-sope. using-directives will affect lookup 2974 // only to the end of scope. 2975 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2976} 2977 2978 2979Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2980 AccessSpecifier AS, 2981 bool HasUsingKeyword, 2982 SourceLocation UsingLoc, 2983 const CXXScopeSpec &SS, 2984 UnqualifiedId &Name, 2985 AttributeList *AttrList, 2986 bool IsTypeName, 2987 SourceLocation TypenameLoc) { 2988 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2989 2990 switch (Name.getKind()) { 2991 case UnqualifiedId::IK_Identifier: 2992 case UnqualifiedId::IK_OperatorFunctionId: 2993 case UnqualifiedId::IK_LiteralOperatorId: 2994 case UnqualifiedId::IK_ConversionFunctionId: 2995 break; 2996 2997 case UnqualifiedId::IK_ConstructorName: 2998 // C++0x inherited constructors. 2999 if (getLangOptions().CPlusPlus0x) break; 3000 3001 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3002 << SS.getRange(); 3003 return DeclPtrTy(); 3004 3005 case UnqualifiedId::IK_DestructorName: 3006 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3007 << SS.getRange(); 3008 return DeclPtrTy(); 3009 3010 case UnqualifiedId::IK_TemplateId: 3011 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3012 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3013 return DeclPtrTy(); 3014 } 3015 3016 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3017 if (!TargetName) 3018 return DeclPtrTy(); 3019 3020 // Warn about using declarations. 3021 // TODO: store that the declaration was written without 'using' and 3022 // talk about access decls instead of using decls in the 3023 // diagnostics. 3024 if (!HasUsingKeyword) { 3025 UsingLoc = Name.getSourceRange().getBegin(); 3026 3027 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3028 << CodeModificationHint::CreateInsertion(SS.getRange().getBegin(), 3029 "using "); 3030 } 3031 3032 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3033 Name.getSourceRange().getBegin(), 3034 TargetName, AttrList, 3035 /* IsInstantiation */ false, 3036 IsTypeName, TypenameLoc); 3037 if (UD) 3038 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3039 3040 return DeclPtrTy::make(UD); 3041} 3042 3043/// Determines whether to create a using shadow decl for a particular 3044/// decl, given the set of decls existing prior to this using lookup. 3045bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3046 const LookupResult &Previous) { 3047 // Diagnose finding a decl which is not from a base class of the 3048 // current class. We do this now because there are cases where this 3049 // function will silently decide not to build a shadow decl, which 3050 // will pre-empt further diagnostics. 3051 // 3052 // We don't need to do this in C++0x because we do the check once on 3053 // the qualifier. 3054 // 3055 // FIXME: diagnose the following if we care enough: 3056 // struct A { int foo; }; 3057 // struct B : A { using A::foo; }; 3058 // template <class T> struct C : A {}; 3059 // template <class T> struct D : C<T> { using B::foo; } // <--- 3060 // This is invalid (during instantiation) in C++03 because B::foo 3061 // resolves to the using decl in B, which is not a base class of D<T>. 3062 // We can't diagnose it immediately because C<T> is an unknown 3063 // specialization. The UsingShadowDecl in D<T> then points directly 3064 // to A::foo, which will look well-formed when we instantiate. 3065 // The right solution is to not collapse the shadow-decl chain. 3066 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3067 DeclContext *OrigDC = Orig->getDeclContext(); 3068 3069 // Handle enums and anonymous structs. 3070 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3071 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3072 while (OrigRec->isAnonymousStructOrUnion()) 3073 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3074 3075 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3076 if (OrigDC == CurContext) { 3077 Diag(Using->getLocation(), 3078 diag::err_using_decl_nested_name_specifier_is_current_class) 3079 << Using->getNestedNameRange(); 3080 Diag(Orig->getLocation(), diag::note_using_decl_target); 3081 return true; 3082 } 3083 3084 Diag(Using->getNestedNameRange().getBegin(), 3085 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3086 << Using->getTargetNestedNameDecl() 3087 << cast<CXXRecordDecl>(CurContext) 3088 << Using->getNestedNameRange(); 3089 Diag(Orig->getLocation(), diag::note_using_decl_target); 3090 return true; 3091 } 3092 } 3093 3094 if (Previous.empty()) return false; 3095 3096 NamedDecl *Target = Orig; 3097 if (isa<UsingShadowDecl>(Target)) 3098 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3099 3100 // If the target happens to be one of the previous declarations, we 3101 // don't have a conflict. 3102 // 3103 // FIXME: but we might be increasing its access, in which case we 3104 // should redeclare it. 3105 NamedDecl *NonTag = 0, *Tag = 0; 3106 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3107 I != E; ++I) { 3108 NamedDecl *D = (*I)->getUnderlyingDecl(); 3109 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3110 return false; 3111 3112 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3113 } 3114 3115 if (Target->isFunctionOrFunctionTemplate()) { 3116 FunctionDecl *FD; 3117 if (isa<FunctionTemplateDecl>(Target)) 3118 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3119 else 3120 FD = cast<FunctionDecl>(Target); 3121 3122 NamedDecl *OldDecl = 0; 3123 switch (CheckOverload(FD, Previous, OldDecl)) { 3124 case Ovl_Overload: 3125 return false; 3126 3127 case Ovl_NonFunction: 3128 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3129 break; 3130 3131 // We found a decl with the exact signature. 3132 case Ovl_Match: 3133 if (isa<UsingShadowDecl>(OldDecl)) { 3134 // Silently ignore the possible conflict. 3135 return false; 3136 } 3137 3138 // If we're in a record, we want to hide the target, so we 3139 // return true (without a diagnostic) to tell the caller not to 3140 // build a shadow decl. 3141 if (CurContext->isRecord()) 3142 return true; 3143 3144 // If we're not in a record, this is an error. 3145 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3146 break; 3147 } 3148 3149 Diag(Target->getLocation(), diag::note_using_decl_target); 3150 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3151 return true; 3152 } 3153 3154 // Target is not a function. 3155 3156 if (isa<TagDecl>(Target)) { 3157 // No conflict between a tag and a non-tag. 3158 if (!Tag) return false; 3159 3160 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3161 Diag(Target->getLocation(), diag::note_using_decl_target); 3162 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3163 return true; 3164 } 3165 3166 // No conflict between a tag and a non-tag. 3167 if (!NonTag) return false; 3168 3169 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3170 Diag(Target->getLocation(), diag::note_using_decl_target); 3171 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3172 return true; 3173} 3174 3175/// Builds a shadow declaration corresponding to a 'using' declaration. 3176UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3177 UsingDecl *UD, 3178 NamedDecl *Orig) { 3179 3180 // If we resolved to another shadow declaration, just coalesce them. 3181 NamedDecl *Target = Orig; 3182 if (isa<UsingShadowDecl>(Target)) { 3183 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3184 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3185 } 3186 3187 UsingShadowDecl *Shadow 3188 = UsingShadowDecl::Create(Context, CurContext, 3189 UD->getLocation(), UD, Target); 3190 UD->addShadowDecl(Shadow); 3191 3192 if (S) 3193 PushOnScopeChains(Shadow, S); 3194 else 3195 CurContext->addDecl(Shadow); 3196 Shadow->setAccess(UD->getAccess()); 3197 3198 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3199 Shadow->setInvalidDecl(); 3200 3201 return Shadow; 3202} 3203 3204/// Hides a using shadow declaration. This is required by the current 3205/// using-decl implementation when a resolvable using declaration in a 3206/// class is followed by a declaration which would hide or override 3207/// one or more of the using decl's targets; for example: 3208/// 3209/// struct Base { void foo(int); }; 3210/// struct Derived : Base { 3211/// using Base::foo; 3212/// void foo(int); 3213/// }; 3214/// 3215/// The governing language is C++03 [namespace.udecl]p12: 3216/// 3217/// When a using-declaration brings names from a base class into a 3218/// derived class scope, member functions in the derived class 3219/// override and/or hide member functions with the same name and 3220/// parameter types in a base class (rather than conflicting). 3221/// 3222/// There are two ways to implement this: 3223/// (1) optimistically create shadow decls when they're not hidden 3224/// by existing declarations, or 3225/// (2) don't create any shadow decls (or at least don't make them 3226/// visible) until we've fully parsed/instantiated the class. 3227/// The problem with (1) is that we might have to retroactively remove 3228/// a shadow decl, which requires several O(n) operations because the 3229/// decl structures are (very reasonably) not designed for removal. 3230/// (2) avoids this but is very fiddly and phase-dependent. 3231void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3232 // Remove it from the DeclContext... 3233 Shadow->getDeclContext()->removeDecl(Shadow); 3234 3235 // ...and the scope, if applicable... 3236 if (S) { 3237 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3238 IdResolver.RemoveDecl(Shadow); 3239 } 3240 3241 // ...and the using decl. 3242 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3243 3244 // TODO: complain somehow if Shadow was used. It shouldn't 3245 // be possible for this to happen, because 3246} 3247 3248/// Builds a using declaration. 3249/// 3250/// \param IsInstantiation - Whether this call arises from an 3251/// instantiation of an unresolved using declaration. We treat 3252/// the lookup differently for these declarations. 3253NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3254 SourceLocation UsingLoc, 3255 const CXXScopeSpec &SS, 3256 SourceLocation IdentLoc, 3257 DeclarationName Name, 3258 AttributeList *AttrList, 3259 bool IsInstantiation, 3260 bool IsTypeName, 3261 SourceLocation TypenameLoc) { 3262 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3263 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3264 3265 // FIXME: We ignore attributes for now. 3266 delete AttrList; 3267 3268 if (SS.isEmpty()) { 3269 Diag(IdentLoc, diag::err_using_requires_qualname); 3270 return 0; 3271 } 3272 3273 // Do the redeclaration lookup in the current scope. 3274 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3275 ForRedeclaration); 3276 Previous.setHideTags(false); 3277 if (S) { 3278 LookupName(Previous, S); 3279 3280 // It is really dumb that we have to do this. 3281 LookupResult::Filter F = Previous.makeFilter(); 3282 while (F.hasNext()) { 3283 NamedDecl *D = F.next(); 3284 if (!isDeclInScope(D, CurContext, S)) 3285 F.erase(); 3286 } 3287 F.done(); 3288 } else { 3289 assert(IsInstantiation && "no scope in non-instantiation"); 3290 assert(CurContext->isRecord() && "scope not record in instantiation"); 3291 LookupQualifiedName(Previous, CurContext); 3292 } 3293 3294 NestedNameSpecifier *NNS = 3295 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3296 3297 // Check for invalid redeclarations. 3298 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3299 return 0; 3300 3301 // Check for bad qualifiers. 3302 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3303 return 0; 3304 3305 DeclContext *LookupContext = computeDeclContext(SS); 3306 NamedDecl *D; 3307 if (!LookupContext) { 3308 if (IsTypeName) { 3309 // FIXME: not all declaration name kinds are legal here 3310 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3311 UsingLoc, TypenameLoc, 3312 SS.getRange(), NNS, 3313 IdentLoc, Name); 3314 } else { 3315 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3316 UsingLoc, SS.getRange(), NNS, 3317 IdentLoc, Name); 3318 } 3319 } else { 3320 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3321 SS.getRange(), UsingLoc, NNS, Name, 3322 IsTypeName); 3323 } 3324 D->setAccess(AS); 3325 CurContext->addDecl(D); 3326 3327 if (!LookupContext) return D; 3328 UsingDecl *UD = cast<UsingDecl>(D); 3329 3330 if (RequireCompleteDeclContext(SS)) { 3331 UD->setInvalidDecl(); 3332 return UD; 3333 } 3334 3335 // Look up the target name. 3336 3337 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3338 3339 // Unlike most lookups, we don't always want to hide tag 3340 // declarations: tag names are visible through the using declaration 3341 // even if hidden by ordinary names, *except* in a dependent context 3342 // where it's important for the sanity of two-phase lookup. 3343 if (!IsInstantiation) 3344 R.setHideTags(false); 3345 3346 LookupQualifiedName(R, LookupContext); 3347 3348 if (R.empty()) { 3349 Diag(IdentLoc, diag::err_no_member) 3350 << Name << LookupContext << SS.getRange(); 3351 UD->setInvalidDecl(); 3352 return UD; 3353 } 3354 3355 if (R.isAmbiguous()) { 3356 UD->setInvalidDecl(); 3357 return UD; 3358 } 3359 3360 if (IsTypeName) { 3361 // If we asked for a typename and got a non-type decl, error out. 3362 if (!R.getAsSingle<TypeDecl>()) { 3363 Diag(IdentLoc, diag::err_using_typename_non_type); 3364 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3365 Diag((*I)->getUnderlyingDecl()->getLocation(), 3366 diag::note_using_decl_target); 3367 UD->setInvalidDecl(); 3368 return UD; 3369 } 3370 } else { 3371 // If we asked for a non-typename and we got a type, error out, 3372 // but only if this is an instantiation of an unresolved using 3373 // decl. Otherwise just silently find the type name. 3374 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3375 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3376 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3377 UD->setInvalidDecl(); 3378 return UD; 3379 } 3380 } 3381 3382 // C++0x N2914 [namespace.udecl]p6: 3383 // A using-declaration shall not name a namespace. 3384 if (R.getAsSingle<NamespaceDecl>()) { 3385 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3386 << SS.getRange(); 3387 UD->setInvalidDecl(); 3388 return UD; 3389 } 3390 3391 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3392 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3393 BuildUsingShadowDecl(S, UD, *I); 3394 } 3395 3396 return UD; 3397} 3398 3399/// Checks that the given using declaration is not an invalid 3400/// redeclaration. Note that this is checking only for the using decl 3401/// itself, not for any ill-formedness among the UsingShadowDecls. 3402bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3403 bool isTypeName, 3404 const CXXScopeSpec &SS, 3405 SourceLocation NameLoc, 3406 const LookupResult &Prev) { 3407 // C++03 [namespace.udecl]p8: 3408 // C++0x [namespace.udecl]p10: 3409 // A using-declaration is a declaration and can therefore be used 3410 // repeatedly where (and only where) multiple declarations are 3411 // allowed. 3412 // That's only in file contexts. 3413 if (CurContext->getLookupContext()->isFileContext()) 3414 return false; 3415 3416 NestedNameSpecifier *Qual 3417 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3418 3419 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3420 NamedDecl *D = *I; 3421 3422 bool DTypename; 3423 NestedNameSpecifier *DQual; 3424 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3425 DTypename = UD->isTypeName(); 3426 DQual = UD->getTargetNestedNameDecl(); 3427 } else if (UnresolvedUsingValueDecl *UD 3428 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3429 DTypename = false; 3430 DQual = UD->getTargetNestedNameSpecifier(); 3431 } else if (UnresolvedUsingTypenameDecl *UD 3432 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3433 DTypename = true; 3434 DQual = UD->getTargetNestedNameSpecifier(); 3435 } else continue; 3436 3437 // using decls differ if one says 'typename' and the other doesn't. 3438 // FIXME: non-dependent using decls? 3439 if (isTypeName != DTypename) continue; 3440 3441 // using decls differ if they name different scopes (but note that 3442 // template instantiation can cause this check to trigger when it 3443 // didn't before instantiation). 3444 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3445 Context.getCanonicalNestedNameSpecifier(DQual)) 3446 continue; 3447 3448 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3449 Diag(D->getLocation(), diag::note_using_decl) << 1; 3450 return true; 3451 } 3452 3453 return false; 3454} 3455 3456 3457/// Checks that the given nested-name qualifier used in a using decl 3458/// in the current context is appropriately related to the current 3459/// scope. If an error is found, diagnoses it and returns true. 3460bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3461 const CXXScopeSpec &SS, 3462 SourceLocation NameLoc) { 3463 DeclContext *NamedContext = computeDeclContext(SS); 3464 3465 if (!CurContext->isRecord()) { 3466 // C++03 [namespace.udecl]p3: 3467 // C++0x [namespace.udecl]p8: 3468 // A using-declaration for a class member shall be a member-declaration. 3469 3470 // If we weren't able to compute a valid scope, it must be a 3471 // dependent class scope. 3472 if (!NamedContext || NamedContext->isRecord()) { 3473 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3474 << SS.getRange(); 3475 return true; 3476 } 3477 3478 // Otherwise, everything is known to be fine. 3479 return false; 3480 } 3481 3482 // The current scope is a record. 3483 3484 // If the named context is dependent, we can't decide much. 3485 if (!NamedContext) { 3486 // FIXME: in C++0x, we can diagnose if we can prove that the 3487 // nested-name-specifier does not refer to a base class, which is 3488 // still possible in some cases. 3489 3490 // Otherwise we have to conservatively report that things might be 3491 // okay. 3492 return false; 3493 } 3494 3495 if (!NamedContext->isRecord()) { 3496 // Ideally this would point at the last name in the specifier, 3497 // but we don't have that level of source info. 3498 Diag(SS.getRange().getBegin(), 3499 diag::err_using_decl_nested_name_specifier_is_not_class) 3500 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3501 return true; 3502 } 3503 3504 if (getLangOptions().CPlusPlus0x) { 3505 // C++0x [namespace.udecl]p3: 3506 // In a using-declaration used as a member-declaration, the 3507 // nested-name-specifier shall name a base class of the class 3508 // being defined. 3509 3510 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3511 cast<CXXRecordDecl>(NamedContext))) { 3512 if (CurContext == NamedContext) { 3513 Diag(NameLoc, 3514 diag::err_using_decl_nested_name_specifier_is_current_class) 3515 << SS.getRange(); 3516 return true; 3517 } 3518 3519 Diag(SS.getRange().getBegin(), 3520 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3521 << (NestedNameSpecifier*) SS.getScopeRep() 3522 << cast<CXXRecordDecl>(CurContext) 3523 << SS.getRange(); 3524 return true; 3525 } 3526 3527 return false; 3528 } 3529 3530 // C++03 [namespace.udecl]p4: 3531 // A using-declaration used as a member-declaration shall refer 3532 // to a member of a base class of the class being defined [etc.]. 3533 3534 // Salient point: SS doesn't have to name a base class as long as 3535 // lookup only finds members from base classes. Therefore we can 3536 // diagnose here only if we can prove that that can't happen, 3537 // i.e. if the class hierarchies provably don't intersect. 3538 3539 // TODO: it would be nice if "definitely valid" results were cached 3540 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3541 // need to be repeated. 3542 3543 struct UserData { 3544 llvm::DenseSet<const CXXRecordDecl*> Bases; 3545 3546 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3547 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3548 Data->Bases.insert(Base); 3549 return true; 3550 } 3551 3552 bool hasDependentBases(const CXXRecordDecl *Class) { 3553 return !Class->forallBases(collect, this); 3554 } 3555 3556 /// Returns true if the base is dependent or is one of the 3557 /// accumulated base classes. 3558 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3559 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3560 return !Data->Bases.count(Base); 3561 } 3562 3563 bool mightShareBases(const CXXRecordDecl *Class) { 3564 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3565 } 3566 }; 3567 3568 UserData Data; 3569 3570 // Returns false if we find a dependent base. 3571 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3572 return false; 3573 3574 // Returns false if the class has a dependent base or if it or one 3575 // of its bases is present in the base set of the current context. 3576 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3577 return false; 3578 3579 Diag(SS.getRange().getBegin(), 3580 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3581 << (NestedNameSpecifier*) SS.getScopeRep() 3582 << cast<CXXRecordDecl>(CurContext) 3583 << SS.getRange(); 3584 3585 return true; 3586} 3587 3588Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3589 SourceLocation NamespaceLoc, 3590 SourceLocation AliasLoc, 3591 IdentifierInfo *Alias, 3592 const CXXScopeSpec &SS, 3593 SourceLocation IdentLoc, 3594 IdentifierInfo *Ident) { 3595 3596 // Lookup the namespace name. 3597 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3598 LookupParsedName(R, S, &SS); 3599 3600 // Check if we have a previous declaration with the same name. 3601 if (NamedDecl *PrevDecl 3602 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3603 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3604 // We already have an alias with the same name that points to the same 3605 // namespace, so don't create a new one. 3606 if (!R.isAmbiguous() && !R.empty() && 3607 AD->getNamespace() == getNamespaceDecl(R.getFoundDecl())) 3608 return DeclPtrTy(); 3609 } 3610 3611 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3612 diag::err_redefinition_different_kind; 3613 Diag(AliasLoc, DiagID) << Alias; 3614 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3615 return DeclPtrTy(); 3616 } 3617 3618 if (R.isAmbiguous()) 3619 return DeclPtrTy(); 3620 3621 if (R.empty()) { 3622 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3623 return DeclPtrTy(); 3624 } 3625 3626 NamespaceAliasDecl *AliasDecl = 3627 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3628 Alias, SS.getRange(), 3629 (NestedNameSpecifier *)SS.getScopeRep(), 3630 IdentLoc, R.getFoundDecl()); 3631 3632 CurContext->addDecl(AliasDecl); 3633 return DeclPtrTy::make(AliasDecl); 3634} 3635 3636void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3637 CXXConstructorDecl *Constructor) { 3638 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3639 !Constructor->isUsed()) && 3640 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3641 3642 CXXRecordDecl *ClassDecl 3643 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3644 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3645 3646 if (SetBaseOrMemberInitializers(Constructor, 0, 0, true)) { 3647 Diag(CurrentLocation, diag::note_member_synthesized_at) 3648 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 3649 Constructor->setInvalidDecl(); 3650 } else { 3651 Constructor->setUsed(); 3652 } 3653} 3654 3655void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3656 CXXDestructorDecl *Destructor) { 3657 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3658 "DefineImplicitDestructor - call it for implicit default dtor"); 3659 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3660 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3661 // C++ [class.dtor] p5 3662 // Before the implicitly-declared default destructor for a class is 3663 // implicitly defined, all the implicitly-declared default destructors 3664 // for its base class and its non-static data members shall have been 3665 // implicitly defined. 3666 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3667 E = ClassDecl->bases_end(); Base != E; ++Base) { 3668 CXXRecordDecl *BaseClassDecl 3669 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3670 if (!BaseClassDecl->hasTrivialDestructor()) { 3671 if (CXXDestructorDecl *BaseDtor = 3672 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 3673 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 3674 else 3675 assert(false && 3676 "DefineImplicitDestructor - missing dtor in a base class"); 3677 } 3678 } 3679 3680 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3681 E = ClassDecl->field_end(); Field != E; ++Field) { 3682 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3683 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3684 FieldType = Array->getElementType(); 3685 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3686 CXXRecordDecl *FieldClassDecl 3687 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3688 if (!FieldClassDecl->hasTrivialDestructor()) { 3689 if (CXXDestructorDecl *FieldDtor = 3690 const_cast<CXXDestructorDecl*>( 3691 FieldClassDecl->getDestructor(Context))) 3692 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 3693 else 3694 assert(false && 3695 "DefineImplicitDestructor - missing dtor in class of a data member"); 3696 } 3697 } 3698 } 3699 3700 // FIXME: If CheckDestructor fails, we should emit a note about where the 3701 // implicit destructor was needed. 3702 if (CheckDestructor(Destructor)) { 3703 Diag(CurrentLocation, diag::note_member_synthesized_at) 3704 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3705 3706 Destructor->setInvalidDecl(); 3707 return; 3708 } 3709 3710 Destructor->setUsed(); 3711} 3712 3713void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3714 CXXMethodDecl *MethodDecl) { 3715 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3716 MethodDecl->getOverloadedOperator() == OO_Equal && 3717 !MethodDecl->isUsed()) && 3718 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3719 3720 CXXRecordDecl *ClassDecl 3721 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3722 3723 // C++[class.copy] p12 3724 // Before the implicitly-declared copy assignment operator for a class is 3725 // implicitly defined, all implicitly-declared copy assignment operators 3726 // for its direct base classes and its nonstatic data members shall have 3727 // been implicitly defined. 3728 bool err = false; 3729 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3730 E = ClassDecl->bases_end(); Base != E; ++Base) { 3731 CXXRecordDecl *BaseClassDecl 3732 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3733 if (CXXMethodDecl *BaseAssignOpMethod = 3734 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3735 BaseClassDecl)) 3736 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3737 } 3738 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3739 E = ClassDecl->field_end(); Field != E; ++Field) { 3740 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3741 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3742 FieldType = Array->getElementType(); 3743 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3744 CXXRecordDecl *FieldClassDecl 3745 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3746 if (CXXMethodDecl *FieldAssignOpMethod = 3747 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3748 FieldClassDecl)) 3749 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3750 } else if (FieldType->isReferenceType()) { 3751 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3752 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3753 Diag(Field->getLocation(), diag::note_declared_at); 3754 Diag(CurrentLocation, diag::note_first_required_here); 3755 err = true; 3756 } else if (FieldType.isConstQualified()) { 3757 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3758 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3759 Diag(Field->getLocation(), diag::note_declared_at); 3760 Diag(CurrentLocation, diag::note_first_required_here); 3761 err = true; 3762 } 3763 } 3764 if (!err) 3765 MethodDecl->setUsed(); 3766} 3767 3768CXXMethodDecl * 3769Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 3770 ParmVarDecl *ParmDecl, 3771 CXXRecordDecl *ClassDecl) { 3772 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3773 QualType RHSType(LHSType); 3774 // If class's assignment operator argument is const/volatile qualified, 3775 // look for operator = (const/volatile B&). Otherwise, look for 3776 // operator = (B&). 3777 RHSType = Context.getCVRQualifiedType(RHSType, 3778 ParmDecl->getType().getCVRQualifiers()); 3779 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3780 LHSType, 3781 SourceLocation())); 3782 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3783 RHSType, 3784 CurrentLocation)); 3785 Expr *Args[2] = { &*LHS, &*RHS }; 3786 OverloadCandidateSet CandidateSet; 3787 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3788 CandidateSet); 3789 OverloadCandidateSet::iterator Best; 3790 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 3791 return cast<CXXMethodDecl>(Best->Function); 3792 assert(false && 3793 "getAssignOperatorMethod - copy assignment operator method not found"); 3794 return 0; 3795} 3796 3797void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3798 CXXConstructorDecl *CopyConstructor, 3799 unsigned TypeQuals) { 3800 assert((CopyConstructor->isImplicit() && 3801 CopyConstructor->isCopyConstructor(TypeQuals) && 3802 !CopyConstructor->isUsed()) && 3803 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3804 3805 CXXRecordDecl *ClassDecl 3806 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3807 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3808 // C++ [class.copy] p209 3809 // Before the implicitly-declared copy constructor for a class is 3810 // implicitly defined, all the implicitly-declared copy constructors 3811 // for its base class and its non-static data members shall have been 3812 // implicitly defined. 3813 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3814 Base != ClassDecl->bases_end(); ++Base) { 3815 CXXRecordDecl *BaseClassDecl 3816 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3817 if (CXXConstructorDecl *BaseCopyCtor = 3818 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 3819 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3820 } 3821 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3822 FieldEnd = ClassDecl->field_end(); 3823 Field != FieldEnd; ++Field) { 3824 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3825 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3826 FieldType = Array->getElementType(); 3827 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3828 CXXRecordDecl *FieldClassDecl 3829 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3830 if (CXXConstructorDecl *FieldCopyCtor = 3831 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 3832 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3833 } 3834 } 3835 CopyConstructor->setUsed(); 3836} 3837 3838Sema::OwningExprResult 3839Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3840 CXXConstructorDecl *Constructor, 3841 MultiExprArg ExprArgs, 3842 bool RequiresZeroInit) { 3843 bool Elidable = false; 3844 3845 // C++ [class.copy]p15: 3846 // Whenever a temporary class object is copied using a copy constructor, and 3847 // this object and the copy have the same cv-unqualified type, an 3848 // implementation is permitted to treat the original and the copy as two 3849 // different ways of referring to the same object and not perform a copy at 3850 // all, even if the class copy constructor or destructor have side effects. 3851 3852 // FIXME: Is this enough? 3853 if (Constructor->isCopyConstructor()) { 3854 Expr *E = ((Expr **)ExprArgs.get())[0]; 3855 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3856 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3857 E = ICE->getSubExpr(); 3858 if (CXXFunctionalCastExpr *FCE = dyn_cast<CXXFunctionalCastExpr>(E)) 3859 E = FCE->getSubExpr(); 3860 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 3861 E = BE->getSubExpr(); 3862 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3863 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3864 E = ICE->getSubExpr(); 3865 3866 if (CallExpr *CE = dyn_cast<CallExpr>(E)) 3867 Elidable = !CE->getCallReturnType()->isReferenceType(); 3868 else if (isa<CXXTemporaryObjectExpr>(E)) 3869 Elidable = true; 3870 else if (isa<CXXConstructExpr>(E)) 3871 Elidable = true; 3872 } 3873 3874 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 3875 Elidable, move(ExprArgs), RequiresZeroInit); 3876} 3877 3878/// BuildCXXConstructExpr - Creates a complete call to a constructor, 3879/// including handling of its default argument expressions. 3880Sema::OwningExprResult 3881Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3882 CXXConstructorDecl *Constructor, bool Elidable, 3883 MultiExprArg ExprArgs, 3884 bool RequiresZeroInit) { 3885 unsigned NumExprs = ExprArgs.size(); 3886 Expr **Exprs = (Expr **)ExprArgs.release(); 3887 3888 MarkDeclarationReferenced(ConstructLoc, Constructor); 3889 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 3890 Constructor, Elidable, Exprs, NumExprs, 3891 RequiresZeroInit)); 3892} 3893 3894Sema::OwningExprResult 3895Sema::BuildCXXTemporaryObjectExpr(CXXConstructorDecl *Constructor, 3896 QualType Ty, 3897 SourceLocation TyBeginLoc, 3898 MultiExprArg Args, 3899 SourceLocation RParenLoc) { 3900 unsigned NumExprs = Args.size(); 3901 Expr **Exprs = (Expr **)Args.release(); 3902 3903 MarkDeclarationReferenced(TyBeginLoc, Constructor); 3904 return Owned(new (Context) CXXTemporaryObjectExpr(Context, Constructor, Ty, 3905 TyBeginLoc, Exprs, 3906 NumExprs, RParenLoc)); 3907} 3908 3909 3910bool Sema::InitializeVarWithConstructor(VarDecl *VD, 3911 CXXConstructorDecl *Constructor, 3912 MultiExprArg Exprs) { 3913 OwningExprResult TempResult = 3914 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 3915 move(Exprs)); 3916 if (TempResult.isInvalid()) 3917 return true; 3918 3919 Expr *Temp = TempResult.takeAs<Expr>(); 3920 MarkDeclarationReferenced(VD->getLocation(), Constructor); 3921 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 3922 VD->setInit(Context, Temp); 3923 3924 return false; 3925} 3926 3927void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) { 3928 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 3929 DeclInitType->getAs<RecordType>()->getDecl()); 3930 if (!ClassDecl->hasTrivialDestructor()) 3931 if (CXXDestructorDecl *Destructor = 3932 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 3933 MarkDeclarationReferenced(VD->getLocation(), Destructor); 3934} 3935 3936/// AddCXXDirectInitializerToDecl - This action is called immediately after 3937/// ActOnDeclarator, when a C++ direct initializer is present. 3938/// e.g: "int x(1);" 3939void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 3940 SourceLocation LParenLoc, 3941 MultiExprArg Exprs, 3942 SourceLocation *CommaLocs, 3943 SourceLocation RParenLoc) { 3944 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 3945 Decl *RealDecl = Dcl.getAs<Decl>(); 3946 3947 // If there is no declaration, there was an error parsing it. Just ignore 3948 // the initializer. 3949 if (RealDecl == 0) 3950 return; 3951 3952 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3953 if (!VDecl) { 3954 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3955 RealDecl->setInvalidDecl(); 3956 return; 3957 } 3958 3959 // We will represent direct-initialization similarly to copy-initialization: 3960 // int x(1); -as-> int x = 1; 3961 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 3962 // 3963 // Clients that want to distinguish between the two forms, can check for 3964 // direct initializer using VarDecl::hasCXXDirectInitializer(). 3965 // A major benefit is that clients that don't particularly care about which 3966 // exactly form was it (like the CodeGen) can handle both cases without 3967 // special case code. 3968 3969 // If either the declaration has a dependent type or if any of the expressions 3970 // is type-dependent, we represent the initialization via a ParenListExpr for 3971 // later use during template instantiation. 3972 if (VDecl->getType()->isDependentType() || 3973 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 3974 // Let clients know that initialization was done with a direct initializer. 3975 VDecl->setCXXDirectInitializer(true); 3976 3977 // Store the initialization expressions as a ParenListExpr. 3978 unsigned NumExprs = Exprs.size(); 3979 VDecl->setInit(Context, 3980 new (Context) ParenListExpr(Context, LParenLoc, 3981 (Expr **)Exprs.release(), 3982 NumExprs, RParenLoc)); 3983 return; 3984 } 3985 3986 3987 // C++ 8.5p11: 3988 // The form of initialization (using parentheses or '=') is generally 3989 // insignificant, but does matter when the entity being initialized has a 3990 // class type. 3991 QualType DeclInitType = VDecl->getType(); 3992 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 3993 DeclInitType = Context.getBaseElementType(Array); 3994 3995 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 3996 diag::err_typecheck_decl_incomplete_type)) { 3997 VDecl->setInvalidDecl(); 3998 return; 3999 } 4000 4001 // The variable can not have an abstract class type. 4002 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4003 diag::err_abstract_type_in_decl, 4004 AbstractVariableType)) 4005 VDecl->setInvalidDecl(); 4006 4007 const VarDecl *Def = 0; 4008 if (VDecl->getDefinition(Def)) { 4009 Diag(VDecl->getLocation(), diag::err_redefinition) 4010 << VDecl->getDeclName(); 4011 Diag(Def->getLocation(), diag::note_previous_definition); 4012 VDecl->setInvalidDecl(); 4013 return; 4014 } 4015 4016 // Capture the variable that is being initialized and the style of 4017 // initialization. 4018 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4019 4020 // FIXME: Poor source location information. 4021 InitializationKind Kind 4022 = InitializationKind::CreateDirect(VDecl->getLocation(), 4023 LParenLoc, RParenLoc); 4024 4025 InitializationSequence InitSeq(*this, Entity, Kind, 4026 (Expr**)Exprs.get(), Exprs.size()); 4027 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4028 if (Result.isInvalid()) { 4029 VDecl->setInvalidDecl(); 4030 return; 4031 } 4032 4033 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4034 VDecl->setInit(Context, Result.takeAs<Expr>()); 4035 VDecl->setCXXDirectInitializer(true); 4036 4037 if (VDecl->getType()->getAs<RecordType>()) 4038 FinalizeVarWithDestructor(VDecl, DeclInitType); 4039} 4040 4041/// \brief Add the applicable constructor candidates for an initialization 4042/// by constructor. 4043static void AddConstructorInitializationCandidates(Sema &SemaRef, 4044 QualType ClassType, 4045 Expr **Args, 4046 unsigned NumArgs, 4047 InitializationKind Kind, 4048 OverloadCandidateSet &CandidateSet) { 4049 // C++ [dcl.init]p14: 4050 // If the initialization is direct-initialization, or if it is 4051 // copy-initialization where the cv-unqualified version of the 4052 // source type is the same class as, or a derived class of, the 4053 // class of the destination, constructors are considered. The 4054 // applicable constructors are enumerated (13.3.1.3), and the 4055 // best one is chosen through overload resolution (13.3). The 4056 // constructor so selected is called to initialize the object, 4057 // with the initializer expression(s) as its argument(s). If no 4058 // constructor applies, or the overload resolution is ambiguous, 4059 // the initialization is ill-formed. 4060 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 4061 assert(ClassRec && "Can only initialize a class type here"); 4062 4063 // FIXME: When we decide not to synthesize the implicitly-declared 4064 // constructors, we'll need to make them appear here. 4065 4066 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 4067 DeclarationName ConstructorName 4068 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 4069 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 4070 DeclContext::lookup_const_iterator Con, ConEnd; 4071 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 4072 Con != ConEnd; ++Con) { 4073 // Find the constructor (which may be a template). 4074 CXXConstructorDecl *Constructor = 0; 4075 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 4076 if (ConstructorTmpl) 4077 Constructor 4078 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 4079 else 4080 Constructor = cast<CXXConstructorDecl>(*Con); 4081 4082 if ((Kind.getKind() == InitializationKind::IK_Direct) || 4083 (Kind.getKind() == InitializationKind::IK_Value) || 4084 (Kind.getKind() == InitializationKind::IK_Copy && 4085 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 4086 ((Kind.getKind() == InitializationKind::IK_Default) && 4087 Constructor->isDefaultConstructor())) { 4088 if (ConstructorTmpl) 4089 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, 4090 /*ExplicitArgs*/ 0, 4091 Args, NumArgs, CandidateSet); 4092 else 4093 SemaRef.AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 4094 } 4095 } 4096} 4097 4098/// \brief Attempt to perform initialization by constructor 4099/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 4100/// copy-initialization. 4101/// 4102/// This routine determines whether initialization by constructor is possible, 4103/// but it does not emit any diagnostics in the case where the initialization 4104/// is ill-formed. 4105/// 4106/// \param ClassType the type of the object being initialized, which must have 4107/// class type. 4108/// 4109/// \param Args the arguments provided to initialize the object 4110/// 4111/// \param NumArgs the number of arguments provided to initialize the object 4112/// 4113/// \param Kind the type of initialization being performed 4114/// 4115/// \returns the constructor used to initialize the object, if successful. 4116/// Otherwise, emits a diagnostic and returns NULL. 4117CXXConstructorDecl * 4118Sema::TryInitializationByConstructor(QualType ClassType, 4119 Expr **Args, unsigned NumArgs, 4120 SourceLocation Loc, 4121 InitializationKind Kind) { 4122 // Build the overload candidate set 4123 OverloadCandidateSet CandidateSet; 4124 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4125 CandidateSet); 4126 4127 // Determine whether we found a constructor we can use. 4128 OverloadCandidateSet::iterator Best; 4129 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4130 case OR_Success: 4131 case OR_Deleted: 4132 // We found a constructor. Return it. 4133 return cast<CXXConstructorDecl>(Best->Function); 4134 4135 case OR_No_Viable_Function: 4136 case OR_Ambiguous: 4137 // Overload resolution failed. Return nothing. 4138 return 0; 4139 } 4140 4141 // Silence GCC warning 4142 return 0; 4143} 4144 4145/// \brief Perform initialization by constructor (C++ [dcl.init]p14), which 4146/// may occur as part of direct-initialization or copy-initialization. 4147/// 4148/// \param ClassType the type of the object being initialized, which must have 4149/// class type. 4150/// 4151/// \param ArgsPtr the arguments provided to initialize the object 4152/// 4153/// \param Loc the source location where the initialization occurs 4154/// 4155/// \param Range the source range that covers the entire initialization 4156/// 4157/// \param InitEntity the name of the entity being initialized, if known 4158/// 4159/// \param Kind the type of initialization being performed 4160/// 4161/// \param ConvertedArgs a vector that will be filled in with the 4162/// appropriately-converted arguments to the constructor (if initialization 4163/// succeeded). 4164/// 4165/// \returns the constructor used to initialize the object, if successful. 4166/// Otherwise, emits a diagnostic and returns NULL. 4167CXXConstructorDecl * 4168Sema::PerformInitializationByConstructor(QualType ClassType, 4169 MultiExprArg ArgsPtr, 4170 SourceLocation Loc, SourceRange Range, 4171 DeclarationName InitEntity, 4172 InitializationKind Kind, 4173 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4174 4175 // Build the overload candidate set 4176 Expr **Args = (Expr **)ArgsPtr.get(); 4177 unsigned NumArgs = ArgsPtr.size(); 4178 OverloadCandidateSet CandidateSet; 4179 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4180 CandidateSet); 4181 4182 OverloadCandidateSet::iterator Best; 4183 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4184 case OR_Success: 4185 // We found a constructor. Break out so that we can convert the arguments 4186 // appropriately. 4187 break; 4188 4189 case OR_No_Viable_Function: 4190 if (InitEntity) 4191 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 4192 << InitEntity << Range; 4193 else 4194 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 4195 << ClassType << Range; 4196 PrintOverloadCandidates(CandidateSet, OCD_AllCandidates); 4197 return 0; 4198 4199 case OR_Ambiguous: 4200 if (InitEntity) 4201 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 4202 else 4203 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 4204 PrintOverloadCandidates(CandidateSet, OCD_ViableCandidates); 4205 return 0; 4206 4207 case OR_Deleted: 4208 if (InitEntity) 4209 Diag(Loc, diag::err_ovl_deleted_init) 4210 << Best->Function->isDeleted() 4211 << InitEntity << Range; 4212 else { 4213 const CXXRecordDecl *RD = 4214 cast<CXXRecordDecl>(ClassType->getAs<RecordType>()->getDecl()); 4215 Diag(Loc, diag::err_ovl_deleted_init) 4216 << Best->Function->isDeleted() 4217 << RD->getDeclName() << Range; 4218 } 4219 PrintOverloadCandidates(CandidateSet, OCD_AllCandidates); 4220 return 0; 4221 } 4222 4223 // Convert the arguments, fill in default arguments, etc. 4224 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function); 4225 if (CompleteConstructorCall(Constructor, move(ArgsPtr), Loc, ConvertedArgs)) 4226 return 0; 4227 4228 return Constructor; 4229} 4230 4231/// \brief Given a constructor and the set of arguments provided for the 4232/// constructor, convert the arguments and add any required default arguments 4233/// to form a proper call to this constructor. 4234/// 4235/// \returns true if an error occurred, false otherwise. 4236bool 4237Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4238 MultiExprArg ArgsPtr, 4239 SourceLocation Loc, 4240 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4241 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4242 unsigned NumArgs = ArgsPtr.size(); 4243 Expr **Args = (Expr **)ArgsPtr.get(); 4244 4245 const FunctionProtoType *Proto 4246 = Constructor->getType()->getAs<FunctionProtoType>(); 4247 assert(Proto && "Constructor without a prototype?"); 4248 unsigned NumArgsInProto = Proto->getNumArgs(); 4249 4250 // If too few arguments are available, we'll fill in the rest with defaults. 4251 if (NumArgs < NumArgsInProto) 4252 ConvertedArgs.reserve(NumArgsInProto); 4253 else 4254 ConvertedArgs.reserve(NumArgs); 4255 4256 VariadicCallType CallType = 4257 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4258 llvm::SmallVector<Expr *, 8> AllArgs; 4259 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4260 Proto, 0, Args, NumArgs, AllArgs, 4261 CallType); 4262 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4263 ConvertedArgs.push_back(AllArgs[i]); 4264 return Invalid; 4265} 4266 4267/// CompareReferenceRelationship - Compare the two types T1 and T2 to 4268/// determine whether they are reference-related, 4269/// reference-compatible, reference-compatible with added 4270/// qualification, or incompatible, for use in C++ initialization by 4271/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 4272/// type, and the first type (T1) is the pointee type of the reference 4273/// type being initialized. 4274Sema::ReferenceCompareResult 4275Sema::CompareReferenceRelationship(SourceLocation Loc, 4276 QualType OrigT1, QualType OrigT2, 4277 bool& DerivedToBase) { 4278 assert(!OrigT1->isReferenceType() && 4279 "T1 must be the pointee type of the reference type"); 4280 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 4281 4282 QualType T1 = Context.getCanonicalType(OrigT1); 4283 QualType T2 = Context.getCanonicalType(OrigT2); 4284 Qualifiers T1Quals, T2Quals; 4285 QualType UnqualT1 = Context.getUnqualifiedArrayType(T1, T1Quals); 4286 QualType UnqualT2 = Context.getUnqualifiedArrayType(T2, T2Quals); 4287 4288 // C++ [dcl.init.ref]p4: 4289 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 4290 // reference-related to "cv2 T2" if T1 is the same type as T2, or 4291 // T1 is a base class of T2. 4292 if (UnqualT1 == UnqualT2) 4293 DerivedToBase = false; 4294 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 4295 !RequireCompleteType(Loc, OrigT2, PDiag()) && 4296 IsDerivedFrom(UnqualT2, UnqualT1)) 4297 DerivedToBase = true; 4298 else 4299 return Ref_Incompatible; 4300 4301 // At this point, we know that T1 and T2 are reference-related (at 4302 // least). 4303 4304 // If the type is an array type, promote the element qualifiers to the type 4305 // for comparison. 4306 if (isa<ArrayType>(T1) && T1Quals) 4307 T1 = Context.getQualifiedType(UnqualT1, T1Quals); 4308 if (isa<ArrayType>(T2) && T2Quals) 4309 T2 = Context.getQualifiedType(UnqualT2, T2Quals); 4310 4311 // C++ [dcl.init.ref]p4: 4312 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 4313 // reference-related to T2 and cv1 is the same cv-qualification 4314 // as, or greater cv-qualification than, cv2. For purposes of 4315 // overload resolution, cases for which cv1 is greater 4316 // cv-qualification than cv2 are identified as 4317 // reference-compatible with added qualification (see 13.3.3.2). 4318 if (T1Quals.getCVRQualifiers() == T2Quals.getCVRQualifiers()) 4319 return Ref_Compatible; 4320 else if (T1.isMoreQualifiedThan(T2)) 4321 return Ref_Compatible_With_Added_Qualification; 4322 else 4323 return Ref_Related; 4324} 4325 4326/// CheckReferenceInit - Check the initialization of a reference 4327/// variable with the given initializer (C++ [dcl.init.ref]). Init is 4328/// the initializer (either a simple initializer or an initializer 4329/// list), and DeclType is the type of the declaration. When ICS is 4330/// non-null, this routine will compute the implicit conversion 4331/// sequence according to C++ [over.ics.ref] and will not produce any 4332/// diagnostics; when ICS is null, it will emit diagnostics when any 4333/// errors are found. Either way, a return value of true indicates 4334/// that there was a failure, a return value of false indicates that 4335/// the reference initialization succeeded. 4336/// 4337/// When @p SuppressUserConversions, user-defined conversions are 4338/// suppressed. 4339/// When @p AllowExplicit, we also permit explicit user-defined 4340/// conversion functions. 4341/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 4342/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 4343/// This is used when this is called from a C-style cast. 4344bool 4345Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 4346 SourceLocation DeclLoc, 4347 bool SuppressUserConversions, 4348 bool AllowExplicit, bool ForceRValue, 4349 ImplicitConversionSequence *ICS, 4350 bool IgnoreBaseAccess) { 4351 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 4352 4353 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 4354 QualType T2 = Init->getType(); 4355 4356 // If the initializer is the address of an overloaded function, try 4357 // to resolve the overloaded function. If all goes well, T2 is the 4358 // type of the resulting function. 4359 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 4360 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 4361 ICS != 0); 4362 if (Fn) { 4363 // Since we're performing this reference-initialization for 4364 // real, update the initializer with the resulting function. 4365 if (!ICS) { 4366 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 4367 return true; 4368 4369 Init = FixOverloadedFunctionReference(Init, Fn); 4370 } 4371 4372 T2 = Fn->getType(); 4373 } 4374 } 4375 4376 // Compute some basic properties of the types and the initializer. 4377 bool isRValRef = DeclType->isRValueReferenceType(); 4378 bool DerivedToBase = false; 4379 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 4380 Init->isLvalue(Context); 4381 ReferenceCompareResult RefRelationship 4382 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 4383 4384 // Most paths end in a failed conversion. 4385 if (ICS) 4386 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 4387 4388 // C++ [dcl.init.ref]p5: 4389 // A reference to type "cv1 T1" is initialized by an expression 4390 // of type "cv2 T2" as follows: 4391 4392 // -- If the initializer expression 4393 4394 // Rvalue references cannot bind to lvalues (N2812). 4395 // There is absolutely no situation where they can. In particular, note that 4396 // this is ill-formed, even if B has a user-defined conversion to A&&: 4397 // B b; 4398 // A&& r = b; 4399 if (isRValRef && InitLvalue == Expr::LV_Valid) { 4400 if (!ICS) 4401 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4402 << Init->getSourceRange(); 4403 return true; 4404 } 4405 4406 bool BindsDirectly = false; 4407 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 4408 // reference-compatible with "cv2 T2," or 4409 // 4410 // Note that the bit-field check is skipped if we are just computing 4411 // the implicit conversion sequence (C++ [over.best.ics]p2). 4412 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 4413 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4414 BindsDirectly = true; 4415 4416 if (ICS) { 4417 // C++ [over.ics.ref]p1: 4418 // When a parameter of reference type binds directly (8.5.3) 4419 // to an argument expression, the implicit conversion sequence 4420 // is the identity conversion, unless the argument expression 4421 // has a type that is a derived class of the parameter type, 4422 // in which case the implicit conversion sequence is a 4423 // derived-to-base Conversion (13.3.3.1). 4424 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 4425 ICS->Standard.First = ICK_Identity; 4426 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4427 ICS->Standard.Third = ICK_Identity; 4428 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4429 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 4430 ICS->Standard.ReferenceBinding = true; 4431 ICS->Standard.DirectBinding = true; 4432 ICS->Standard.RRefBinding = false; 4433 ICS->Standard.CopyConstructor = 0; 4434 4435 // Nothing more to do: the inaccessibility/ambiguity check for 4436 // derived-to-base conversions is suppressed when we're 4437 // computing the implicit conversion sequence (C++ 4438 // [over.best.ics]p2). 4439 return false; 4440 } else { 4441 // Perform the conversion. 4442 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4443 if (DerivedToBase) 4444 CK = CastExpr::CK_DerivedToBase; 4445 else if(CheckExceptionSpecCompatibility(Init, T1)) 4446 return true; 4447 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 4448 } 4449 } 4450 4451 // -- has a class type (i.e., T2 is a class type) and can be 4452 // implicitly converted to an lvalue of type "cv3 T3," 4453 // where "cv1 T1" is reference-compatible with "cv3 T3" 4454 // 92) (this conversion is selected by enumerating the 4455 // applicable conversion functions (13.3.1.6) and choosing 4456 // the best one through overload resolution (13.3)), 4457 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 4458 !RequireCompleteType(DeclLoc, T2, 0)) { 4459 CXXRecordDecl *T2RecordDecl 4460 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 4461 4462 OverloadCandidateSet CandidateSet; 4463 const UnresolvedSet *Conversions 4464 = T2RecordDecl->getVisibleConversionFunctions(); 4465 for (UnresolvedSet::iterator I = Conversions->begin(), 4466 E = Conversions->end(); I != E; ++I) { 4467 NamedDecl *D = *I; 4468 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); 4469 if (isa<UsingShadowDecl>(D)) 4470 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 4471 4472 FunctionTemplateDecl *ConvTemplate 4473 = dyn_cast<FunctionTemplateDecl>(D); 4474 CXXConversionDecl *Conv; 4475 if (ConvTemplate) 4476 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 4477 else 4478 Conv = cast<CXXConversionDecl>(D); 4479 4480 // If the conversion function doesn't return a reference type, 4481 // it can't be considered for this conversion. 4482 if (Conv->getConversionType()->isLValueReferenceType() && 4483 (AllowExplicit || !Conv->isExplicit())) { 4484 if (ConvTemplate) 4485 AddTemplateConversionCandidate(ConvTemplate, ActingDC, 4486 Init, DeclType, CandidateSet); 4487 else 4488 AddConversionCandidate(Conv, ActingDC, Init, DeclType, CandidateSet); 4489 } 4490 } 4491 4492 OverloadCandidateSet::iterator Best; 4493 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 4494 case OR_Success: 4495 // This is a direct binding. 4496 BindsDirectly = true; 4497 4498 if (ICS) { 4499 // C++ [over.ics.ref]p1: 4500 // 4501 // [...] If the parameter binds directly to the result of 4502 // applying a conversion function to the argument 4503 // expression, the implicit conversion sequence is a 4504 // user-defined conversion sequence (13.3.3.1.2), with the 4505 // second standard conversion sequence either an identity 4506 // conversion or, if the conversion function returns an 4507 // entity of a type that is a derived class of the parameter 4508 // type, a derived-to-base Conversion. 4509 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 4510 ICS->UserDefined.Before = Best->Conversions[0].Standard; 4511 ICS->UserDefined.After = Best->FinalConversion; 4512 ICS->UserDefined.ConversionFunction = Best->Function; 4513 ICS->UserDefined.EllipsisConversion = false; 4514 assert(ICS->UserDefined.After.ReferenceBinding && 4515 ICS->UserDefined.After.DirectBinding && 4516 "Expected a direct reference binding!"); 4517 return false; 4518 } else { 4519 OwningExprResult InitConversion = 4520 BuildCXXCastArgument(DeclLoc, QualType(), 4521 CastExpr::CK_UserDefinedConversion, 4522 cast<CXXMethodDecl>(Best->Function), 4523 Owned(Init)); 4524 Init = InitConversion.takeAs<Expr>(); 4525 4526 if (CheckExceptionSpecCompatibility(Init, T1)) 4527 return true; 4528 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 4529 /*isLvalue=*/true); 4530 } 4531 break; 4532 4533 case OR_Ambiguous: 4534 if (ICS) { 4535 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 4536 Cand != CandidateSet.end(); ++Cand) 4537 if (Cand->Viable) 4538 ICS->ConversionFunctionSet.push_back(Cand->Function); 4539 break; 4540 } 4541 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 4542 << Init->getSourceRange(); 4543 PrintOverloadCandidates(CandidateSet, OCD_ViableCandidates); 4544 return true; 4545 4546 case OR_No_Viable_Function: 4547 case OR_Deleted: 4548 // There was no suitable conversion, or we found a deleted 4549 // conversion; continue with other checks. 4550 break; 4551 } 4552 } 4553 4554 if (BindsDirectly) { 4555 // C++ [dcl.init.ref]p4: 4556 // [...] In all cases where the reference-related or 4557 // reference-compatible relationship of two types is used to 4558 // establish the validity of a reference binding, and T1 is a 4559 // base class of T2, a program that necessitates such a binding 4560 // is ill-formed if T1 is an inaccessible (clause 11) or 4561 // ambiguous (10.2) base class of T2. 4562 // 4563 // Note that we only check this condition when we're allowed to 4564 // complain about errors, because we should not be checking for 4565 // ambiguity (or inaccessibility) unless the reference binding 4566 // actually happens. 4567 if (DerivedToBase) 4568 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 4569 Init->getSourceRange(), 4570 IgnoreBaseAccess); 4571 else 4572 return false; 4573 } 4574 4575 // -- Otherwise, the reference shall be to a non-volatile const 4576 // type (i.e., cv1 shall be const), or the reference shall be an 4577 // rvalue reference and the initializer expression shall be an rvalue. 4578 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4579 if (!ICS) 4580 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4581 << T1 << int(InitLvalue != Expr::LV_Valid) 4582 << T2 << Init->getSourceRange(); 4583 return true; 4584 } 4585 4586 // -- If the initializer expression is an rvalue, with T2 a 4587 // class type, and "cv1 T1" is reference-compatible with 4588 // "cv2 T2," the reference is bound in one of the 4589 // following ways (the choice is implementation-defined): 4590 // 4591 // -- The reference is bound to the object represented by 4592 // the rvalue (see 3.10) or to a sub-object within that 4593 // object. 4594 // 4595 // -- A temporary of type "cv1 T2" [sic] is created, and 4596 // a constructor is called to copy the entire rvalue 4597 // object into the temporary. The reference is bound to 4598 // the temporary or to a sub-object within the 4599 // temporary. 4600 // 4601 // The constructor that would be used to make the copy 4602 // shall be callable whether or not the copy is actually 4603 // done. 4604 // 4605 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4606 // freedom, so we will always take the first option and never build 4607 // a temporary in this case. FIXME: We will, however, have to check 4608 // for the presence of a copy constructor in C++98/03 mode. 4609 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4610 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4611 if (ICS) { 4612 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 4613 ICS->Standard.First = ICK_Identity; 4614 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4615 ICS->Standard.Third = ICK_Identity; 4616 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4617 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 4618 ICS->Standard.ReferenceBinding = true; 4619 ICS->Standard.DirectBinding = false; 4620 ICS->Standard.RRefBinding = isRValRef; 4621 ICS->Standard.CopyConstructor = 0; 4622 } else { 4623 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4624 if (DerivedToBase) 4625 CK = CastExpr::CK_DerivedToBase; 4626 else if(CheckExceptionSpecCompatibility(Init, T1)) 4627 return true; 4628 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4629 } 4630 return false; 4631 } 4632 4633 // -- Otherwise, a temporary of type "cv1 T1" is created and 4634 // initialized from the initializer expression using the 4635 // rules for a non-reference copy initialization (8.5). The 4636 // reference is then bound to the temporary. If T1 is 4637 // reference-related to T2, cv1 must be the same 4638 // cv-qualification as, or greater cv-qualification than, 4639 // cv2; otherwise, the program is ill-formed. 4640 if (RefRelationship == Ref_Related) { 4641 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4642 // we would be reference-compatible or reference-compatible with 4643 // added qualification. But that wasn't the case, so the reference 4644 // initialization fails. 4645 if (!ICS) 4646 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4647 << T1 << int(InitLvalue != Expr::LV_Valid) 4648 << T2 << Init->getSourceRange(); 4649 return true; 4650 } 4651 4652 // If at least one of the types is a class type, the types are not 4653 // related, and we aren't allowed any user conversions, the 4654 // reference binding fails. This case is important for breaking 4655 // recursion, since TryImplicitConversion below will attempt to 4656 // create a temporary through the use of a copy constructor. 4657 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4658 (T1->isRecordType() || T2->isRecordType())) { 4659 if (!ICS) 4660 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4661 << DeclType << Init->getType() << AA_Initializing << Init->getSourceRange(); 4662 return true; 4663 } 4664 4665 // Actually try to convert the initializer to T1. 4666 if (ICS) { 4667 // C++ [over.ics.ref]p2: 4668 // 4669 // When a parameter of reference type is not bound directly to 4670 // an argument expression, the conversion sequence is the one 4671 // required to convert the argument expression to the 4672 // underlying type of the reference according to 4673 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4674 // to copy-initializing a temporary of the underlying type with 4675 // the argument expression. Any difference in top-level 4676 // cv-qualification is subsumed by the initialization itself 4677 // and does not constitute a conversion. 4678 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4679 /*AllowExplicit=*/false, 4680 /*ForceRValue=*/false, 4681 /*InOverloadResolution=*/false); 4682 4683 // Of course, that's still a reference binding. 4684 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 4685 ICS->Standard.ReferenceBinding = true; 4686 ICS->Standard.RRefBinding = isRValRef; 4687 } else if (ICS->ConversionKind == 4688 ImplicitConversionSequence::UserDefinedConversion) { 4689 ICS->UserDefined.After.ReferenceBinding = true; 4690 ICS->UserDefined.After.RRefBinding = isRValRef; 4691 } 4692 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 4693 } else { 4694 ImplicitConversionSequence Conversions; 4695 bool badConversion = PerformImplicitConversion(Init, T1, AA_Initializing, 4696 false, false, 4697 Conversions); 4698 if (badConversion) { 4699 if ((Conversions.ConversionKind == 4700 ImplicitConversionSequence::BadConversion) 4701 && !Conversions.ConversionFunctionSet.empty()) { 4702 Diag(DeclLoc, 4703 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4704 for (int j = Conversions.ConversionFunctionSet.size()-1; 4705 j >= 0; j--) { 4706 FunctionDecl *Func = Conversions.ConversionFunctionSet[j]; 4707 NoteOverloadCandidate(Func); 4708 } 4709 } 4710 else { 4711 if (isRValRef) 4712 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4713 << Init->getSourceRange(); 4714 else 4715 Diag(DeclLoc, diag::err_invalid_initialization) 4716 << DeclType << Init->getType() << Init->getSourceRange(); 4717 } 4718 } 4719 return badConversion; 4720 } 4721} 4722 4723static inline bool 4724CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4725 const FunctionDecl *FnDecl) { 4726 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4727 if (isa<NamespaceDecl>(DC)) { 4728 return SemaRef.Diag(FnDecl->getLocation(), 4729 diag::err_operator_new_delete_declared_in_namespace) 4730 << FnDecl->getDeclName(); 4731 } 4732 4733 if (isa<TranslationUnitDecl>(DC) && 4734 FnDecl->getStorageClass() == FunctionDecl::Static) { 4735 return SemaRef.Diag(FnDecl->getLocation(), 4736 diag::err_operator_new_delete_declared_static) 4737 << FnDecl->getDeclName(); 4738 } 4739 4740 return false; 4741} 4742 4743static inline bool 4744CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4745 CanQualType ExpectedResultType, 4746 CanQualType ExpectedFirstParamType, 4747 unsigned DependentParamTypeDiag, 4748 unsigned InvalidParamTypeDiag) { 4749 QualType ResultType = 4750 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4751 4752 // Check that the result type is not dependent. 4753 if (ResultType->isDependentType()) 4754 return SemaRef.Diag(FnDecl->getLocation(), 4755 diag::err_operator_new_delete_dependent_result_type) 4756 << FnDecl->getDeclName() << ExpectedResultType; 4757 4758 // Check that the result type is what we expect. 4759 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4760 return SemaRef.Diag(FnDecl->getLocation(), 4761 diag::err_operator_new_delete_invalid_result_type) 4762 << FnDecl->getDeclName() << ExpectedResultType; 4763 4764 // A function template must have at least 2 parameters. 4765 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4766 return SemaRef.Diag(FnDecl->getLocation(), 4767 diag::err_operator_new_delete_template_too_few_parameters) 4768 << FnDecl->getDeclName(); 4769 4770 // The function decl must have at least 1 parameter. 4771 if (FnDecl->getNumParams() == 0) 4772 return SemaRef.Diag(FnDecl->getLocation(), 4773 diag::err_operator_new_delete_too_few_parameters) 4774 << FnDecl->getDeclName(); 4775 4776 // Check the the first parameter type is not dependent. 4777 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4778 if (FirstParamType->isDependentType()) 4779 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4780 << FnDecl->getDeclName() << ExpectedFirstParamType; 4781 4782 // Check that the first parameter type is what we expect. 4783 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4784 ExpectedFirstParamType) 4785 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4786 << FnDecl->getDeclName() << ExpectedFirstParamType; 4787 4788 return false; 4789} 4790 4791static bool 4792CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4793 // C++ [basic.stc.dynamic.allocation]p1: 4794 // A program is ill-formed if an allocation function is declared in a 4795 // namespace scope other than global scope or declared static in global 4796 // scope. 4797 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4798 return true; 4799 4800 CanQualType SizeTy = 4801 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4802 4803 // C++ [basic.stc.dynamic.allocation]p1: 4804 // The return type shall be void*. The first parameter shall have type 4805 // std::size_t. 4806 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4807 SizeTy, 4808 diag::err_operator_new_dependent_param_type, 4809 diag::err_operator_new_param_type)) 4810 return true; 4811 4812 // C++ [basic.stc.dynamic.allocation]p1: 4813 // The first parameter shall not have an associated default argument. 4814 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4815 return SemaRef.Diag(FnDecl->getLocation(), 4816 diag::err_operator_new_default_arg) 4817 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4818 4819 return false; 4820} 4821 4822static bool 4823CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4824 // C++ [basic.stc.dynamic.deallocation]p1: 4825 // A program is ill-formed if deallocation functions are declared in a 4826 // namespace scope other than global scope or declared static in global 4827 // scope. 4828 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4829 return true; 4830 4831 // C++ [basic.stc.dynamic.deallocation]p2: 4832 // Each deallocation function shall return void and its first parameter 4833 // shall be void*. 4834 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4835 SemaRef.Context.VoidPtrTy, 4836 diag::err_operator_delete_dependent_param_type, 4837 diag::err_operator_delete_param_type)) 4838 return true; 4839 4840 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4841 if (FirstParamType->isDependentType()) 4842 return SemaRef.Diag(FnDecl->getLocation(), 4843 diag::err_operator_delete_dependent_param_type) 4844 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4845 4846 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4847 SemaRef.Context.VoidPtrTy) 4848 return SemaRef.Diag(FnDecl->getLocation(), 4849 diag::err_operator_delete_param_type) 4850 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4851 4852 return false; 4853} 4854 4855/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4856/// of this overloaded operator is well-formed. If so, returns false; 4857/// otherwise, emits appropriate diagnostics and returns true. 4858bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4859 assert(FnDecl && FnDecl->isOverloadedOperator() && 4860 "Expected an overloaded operator declaration"); 4861 4862 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4863 4864 // C++ [over.oper]p5: 4865 // The allocation and deallocation functions, operator new, 4866 // operator new[], operator delete and operator delete[], are 4867 // described completely in 3.7.3. The attributes and restrictions 4868 // found in the rest of this subclause do not apply to them unless 4869 // explicitly stated in 3.7.3. 4870 if (Op == OO_Delete || Op == OO_Array_Delete) 4871 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4872 4873 if (Op == OO_New || Op == OO_Array_New) 4874 return CheckOperatorNewDeclaration(*this, FnDecl); 4875 4876 // C++ [over.oper]p6: 4877 // An operator function shall either be a non-static member 4878 // function or be a non-member function and have at least one 4879 // parameter whose type is a class, a reference to a class, an 4880 // enumeration, or a reference to an enumeration. 4881 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4882 if (MethodDecl->isStatic()) 4883 return Diag(FnDecl->getLocation(), 4884 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4885 } else { 4886 bool ClassOrEnumParam = false; 4887 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4888 ParamEnd = FnDecl->param_end(); 4889 Param != ParamEnd; ++Param) { 4890 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4891 if (ParamType->isDependentType() || ParamType->isRecordType() || 4892 ParamType->isEnumeralType()) { 4893 ClassOrEnumParam = true; 4894 break; 4895 } 4896 } 4897 4898 if (!ClassOrEnumParam) 4899 return Diag(FnDecl->getLocation(), 4900 diag::err_operator_overload_needs_class_or_enum) 4901 << FnDecl->getDeclName(); 4902 } 4903 4904 // C++ [over.oper]p8: 4905 // An operator function cannot have default arguments (8.3.6), 4906 // except where explicitly stated below. 4907 // 4908 // Only the function-call operator allows default arguments 4909 // (C++ [over.call]p1). 4910 if (Op != OO_Call) { 4911 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4912 Param != FnDecl->param_end(); ++Param) { 4913 if ((*Param)->hasDefaultArg()) 4914 return Diag((*Param)->getLocation(), 4915 diag::err_operator_overload_default_arg) 4916 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4917 } 4918 } 4919 4920 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4921 { false, false, false } 4922#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4923 , { Unary, Binary, MemberOnly } 4924#include "clang/Basic/OperatorKinds.def" 4925 }; 4926 4927 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4928 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4929 bool MustBeMemberOperator = OperatorUses[Op][2]; 4930 4931 // C++ [over.oper]p8: 4932 // [...] Operator functions cannot have more or fewer parameters 4933 // than the number required for the corresponding operator, as 4934 // described in the rest of this subclause. 4935 unsigned NumParams = FnDecl->getNumParams() 4936 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4937 if (Op != OO_Call && 4938 ((NumParams == 1 && !CanBeUnaryOperator) || 4939 (NumParams == 2 && !CanBeBinaryOperator) || 4940 (NumParams < 1) || (NumParams > 2))) { 4941 // We have the wrong number of parameters. 4942 unsigned ErrorKind; 4943 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4944 ErrorKind = 2; // 2 -> unary or binary. 4945 } else if (CanBeUnaryOperator) { 4946 ErrorKind = 0; // 0 -> unary 4947 } else { 4948 assert(CanBeBinaryOperator && 4949 "All non-call overloaded operators are unary or binary!"); 4950 ErrorKind = 1; // 1 -> binary 4951 } 4952 4953 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4954 << FnDecl->getDeclName() << NumParams << ErrorKind; 4955 } 4956 4957 // Overloaded operators other than operator() cannot be variadic. 4958 if (Op != OO_Call && 4959 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4960 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4961 << FnDecl->getDeclName(); 4962 } 4963 4964 // Some operators must be non-static member functions. 4965 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4966 return Diag(FnDecl->getLocation(), 4967 diag::err_operator_overload_must_be_member) 4968 << FnDecl->getDeclName(); 4969 } 4970 4971 // C++ [over.inc]p1: 4972 // The user-defined function called operator++ implements the 4973 // prefix and postfix ++ operator. If this function is a member 4974 // function with no parameters, or a non-member function with one 4975 // parameter of class or enumeration type, it defines the prefix 4976 // increment operator ++ for objects of that type. If the function 4977 // is a member function with one parameter (which shall be of type 4978 // int) or a non-member function with two parameters (the second 4979 // of which shall be of type int), it defines the postfix 4980 // increment operator ++ for objects of that type. 4981 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4982 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4983 bool ParamIsInt = false; 4984 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4985 ParamIsInt = BT->getKind() == BuiltinType::Int; 4986 4987 if (!ParamIsInt) 4988 return Diag(LastParam->getLocation(), 4989 diag::err_operator_overload_post_incdec_must_be_int) 4990 << LastParam->getType() << (Op == OO_MinusMinus); 4991 } 4992 4993 // Notify the class if it got an assignment operator. 4994 if (Op == OO_Equal) { 4995 // Would have returned earlier otherwise. 4996 assert(isa<CXXMethodDecl>(FnDecl) && 4997 "Overloaded = not member, but not filtered."); 4998 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 4999 Method->getParent()->addedAssignmentOperator(Context, Method); 5000 } 5001 5002 return false; 5003} 5004 5005/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5006/// linkage specification, including the language and (if present) 5007/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5008/// the location of the language string literal, which is provided 5009/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5010/// the '{' brace. Otherwise, this linkage specification does not 5011/// have any braces. 5012Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5013 SourceLocation ExternLoc, 5014 SourceLocation LangLoc, 5015 const char *Lang, 5016 unsigned StrSize, 5017 SourceLocation LBraceLoc) { 5018 LinkageSpecDecl::LanguageIDs Language; 5019 if (strncmp(Lang, "\"C\"", StrSize) == 0) 5020 Language = LinkageSpecDecl::lang_c; 5021 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 5022 Language = LinkageSpecDecl::lang_cxx; 5023 else { 5024 Diag(LangLoc, diag::err_bad_language); 5025 return DeclPtrTy(); 5026 } 5027 5028 // FIXME: Add all the various semantics of linkage specifications 5029 5030 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5031 LangLoc, Language, 5032 LBraceLoc.isValid()); 5033 CurContext->addDecl(D); 5034 PushDeclContext(S, D); 5035 return DeclPtrTy::make(D); 5036} 5037 5038/// ActOnFinishLinkageSpecification - Completely the definition of 5039/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5040/// valid, it's the position of the closing '}' brace in a linkage 5041/// specification that uses braces. 5042Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5043 DeclPtrTy LinkageSpec, 5044 SourceLocation RBraceLoc) { 5045 if (LinkageSpec) 5046 PopDeclContext(); 5047 return LinkageSpec; 5048} 5049 5050/// \brief Perform semantic analysis for the variable declaration that 5051/// occurs within a C++ catch clause, returning the newly-created 5052/// variable. 5053VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5054 TypeSourceInfo *TInfo, 5055 IdentifierInfo *Name, 5056 SourceLocation Loc, 5057 SourceRange Range) { 5058 bool Invalid = false; 5059 5060 // Arrays and functions decay. 5061 if (ExDeclType->isArrayType()) 5062 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5063 else if (ExDeclType->isFunctionType()) 5064 ExDeclType = Context.getPointerType(ExDeclType); 5065 5066 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5067 // The exception-declaration shall not denote a pointer or reference to an 5068 // incomplete type, other than [cv] void*. 5069 // N2844 forbids rvalue references. 5070 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5071 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5072 Invalid = true; 5073 } 5074 5075 QualType BaseType = ExDeclType; 5076 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5077 unsigned DK = diag::err_catch_incomplete; 5078 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5079 BaseType = Ptr->getPointeeType(); 5080 Mode = 1; 5081 DK = diag::err_catch_incomplete_ptr; 5082 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5083 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5084 BaseType = Ref->getPointeeType(); 5085 Mode = 2; 5086 DK = diag::err_catch_incomplete_ref; 5087 } 5088 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5089 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 5090 Invalid = true; 5091 5092 if (!Invalid && !ExDeclType->isDependentType() && 5093 RequireNonAbstractType(Loc, ExDeclType, 5094 diag::err_abstract_type_in_decl, 5095 AbstractVariableType)) 5096 Invalid = true; 5097 5098 // FIXME: Need to test for ability to copy-construct and destroy the 5099 // exception variable. 5100 5101 // FIXME: Need to check for abstract classes. 5102 5103 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5104 Name, ExDeclType, TInfo, VarDecl::None); 5105 5106 if (Invalid) 5107 ExDecl->setInvalidDecl(); 5108 5109 return ExDecl; 5110} 5111 5112/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5113/// handler. 5114Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5115 TypeSourceInfo *TInfo = 0; 5116 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5117 5118 bool Invalid = D.isInvalidType(); 5119 IdentifierInfo *II = D.getIdentifier(); 5120 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 5121 // The scope should be freshly made just for us. There is just no way 5122 // it contains any previous declaration. 5123 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5124 if (PrevDecl->isTemplateParameter()) { 5125 // Maybe we will complain about the shadowed template parameter. 5126 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5127 } 5128 } 5129 5130 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5131 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5132 << D.getCXXScopeSpec().getRange(); 5133 Invalid = true; 5134 } 5135 5136 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5137 D.getIdentifier(), 5138 D.getIdentifierLoc(), 5139 D.getDeclSpec().getSourceRange()); 5140 5141 if (Invalid) 5142 ExDecl->setInvalidDecl(); 5143 5144 // Add the exception declaration into this scope. 5145 if (II) 5146 PushOnScopeChains(ExDecl, S); 5147 else 5148 CurContext->addDecl(ExDecl); 5149 5150 ProcessDeclAttributes(S, ExDecl, D); 5151 return DeclPtrTy::make(ExDecl); 5152} 5153 5154Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5155 ExprArg assertexpr, 5156 ExprArg assertmessageexpr) { 5157 Expr *AssertExpr = (Expr *)assertexpr.get(); 5158 StringLiteral *AssertMessage = 5159 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5160 5161 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5162 llvm::APSInt Value(32); 5163 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5164 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5165 AssertExpr->getSourceRange(); 5166 return DeclPtrTy(); 5167 } 5168 5169 if (Value == 0) { 5170 Diag(AssertLoc, diag::err_static_assert_failed) 5171 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5172 } 5173 } 5174 5175 assertexpr.release(); 5176 assertmessageexpr.release(); 5177 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5178 AssertExpr, AssertMessage); 5179 5180 CurContext->addDecl(Decl); 5181 return DeclPtrTy::make(Decl); 5182} 5183 5184/// Handle a friend type declaration. This works in tandem with 5185/// ActOnTag. 5186/// 5187/// Notes on friend class templates: 5188/// 5189/// We generally treat friend class declarations as if they were 5190/// declaring a class. So, for example, the elaborated type specifier 5191/// in a friend declaration is required to obey the restrictions of a 5192/// class-head (i.e. no typedefs in the scope chain), template 5193/// parameters are required to match up with simple template-ids, &c. 5194/// However, unlike when declaring a template specialization, it's 5195/// okay to refer to a template specialization without an empty 5196/// template parameter declaration, e.g. 5197/// friend class A<T>::B<unsigned>; 5198/// We permit this as a special case; if there are any template 5199/// parameters present at all, require proper matching, i.e. 5200/// template <> template <class T> friend class A<int>::B; 5201Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5202 MultiTemplateParamsArg TempParams) { 5203 SourceLocation Loc = DS.getSourceRange().getBegin(); 5204 5205 assert(DS.isFriendSpecified()); 5206 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5207 5208 // Try to convert the decl specifier to a type. This works for 5209 // friend templates because ActOnTag never produces a ClassTemplateDecl 5210 // for a TUK_Friend. 5211 Declarator TheDeclarator(DS, Declarator::MemberContext); 5212 QualType T = GetTypeForDeclarator(TheDeclarator, S); 5213 if (TheDeclarator.isInvalidType()) 5214 return DeclPtrTy(); 5215 5216 // This is definitely an error in C++98. It's probably meant to 5217 // be forbidden in C++0x, too, but the specification is just 5218 // poorly written. 5219 // 5220 // The problem is with declarations like the following: 5221 // template <T> friend A<T>::foo; 5222 // where deciding whether a class C is a friend or not now hinges 5223 // on whether there exists an instantiation of A that causes 5224 // 'foo' to equal C. There are restrictions on class-heads 5225 // (which we declare (by fiat) elaborated friend declarations to 5226 // be) that makes this tractable. 5227 // 5228 // FIXME: handle "template <> friend class A<T>;", which 5229 // is possibly well-formed? Who even knows? 5230 if (TempParams.size() && !isa<ElaboratedType>(T)) { 5231 Diag(Loc, diag::err_tagless_friend_type_template) 5232 << DS.getSourceRange(); 5233 return DeclPtrTy(); 5234 } 5235 5236 // C++ [class.friend]p2: 5237 // An elaborated-type-specifier shall be used in a friend declaration 5238 // for a class.* 5239 // * The class-key of the elaborated-type-specifier is required. 5240 // This is one of the rare places in Clang where it's legitimate to 5241 // ask about the "spelling" of the type. 5242 if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) { 5243 // If we evaluated the type to a record type, suggest putting 5244 // a tag in front. 5245 if (const RecordType *RT = T->getAs<RecordType>()) { 5246 RecordDecl *RD = RT->getDecl(); 5247 5248 std::string InsertionText = std::string(" ") + RD->getKindName(); 5249 5250 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 5251 << (unsigned) RD->getTagKind() 5252 << T 5253 << SourceRange(DS.getFriendSpecLoc()) 5254 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 5255 InsertionText); 5256 return DeclPtrTy(); 5257 }else { 5258 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 5259 << DS.getSourceRange(); 5260 return DeclPtrTy(); 5261 } 5262 } 5263 5264 // Enum types cannot be friends. 5265 if (T->getAs<EnumType>()) { 5266 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 5267 << SourceRange(DS.getFriendSpecLoc()); 5268 return DeclPtrTy(); 5269 } 5270 5271 // C++98 [class.friend]p1: A friend of a class is a function 5272 // or class that is not a member of the class . . . 5273 // This is fixed in DR77, which just barely didn't make the C++03 5274 // deadline. It's also a very silly restriction that seriously 5275 // affects inner classes and which nobody else seems to implement; 5276 // thus we never diagnose it, not even in -pedantic. 5277 5278 Decl *D; 5279 if (TempParams.size()) 5280 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5281 TempParams.size(), 5282 (TemplateParameterList**) TempParams.release(), 5283 T.getTypePtr(), 5284 DS.getFriendSpecLoc()); 5285 else 5286 D = FriendDecl::Create(Context, CurContext, Loc, T.getTypePtr(), 5287 DS.getFriendSpecLoc()); 5288 D->setAccess(AS_public); 5289 CurContext->addDecl(D); 5290 5291 return DeclPtrTy::make(D); 5292} 5293 5294Sema::DeclPtrTy 5295Sema::ActOnFriendFunctionDecl(Scope *S, 5296 Declarator &D, 5297 bool IsDefinition, 5298 MultiTemplateParamsArg TemplateParams) { 5299 const DeclSpec &DS = D.getDeclSpec(); 5300 5301 assert(DS.isFriendSpecified()); 5302 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5303 5304 SourceLocation Loc = D.getIdentifierLoc(); 5305 TypeSourceInfo *TInfo = 0; 5306 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5307 5308 // C++ [class.friend]p1 5309 // A friend of a class is a function or class.... 5310 // Note that this sees through typedefs, which is intended. 5311 // It *doesn't* see through dependent types, which is correct 5312 // according to [temp.arg.type]p3: 5313 // If a declaration acquires a function type through a 5314 // type dependent on a template-parameter and this causes 5315 // a declaration that does not use the syntactic form of a 5316 // function declarator to have a function type, the program 5317 // is ill-formed. 5318 if (!T->isFunctionType()) { 5319 Diag(Loc, diag::err_unexpected_friend); 5320 5321 // It might be worthwhile to try to recover by creating an 5322 // appropriate declaration. 5323 return DeclPtrTy(); 5324 } 5325 5326 // C++ [namespace.memdef]p3 5327 // - If a friend declaration in a non-local class first declares a 5328 // class or function, the friend class or function is a member 5329 // of the innermost enclosing namespace. 5330 // - The name of the friend is not found by simple name lookup 5331 // until a matching declaration is provided in that namespace 5332 // scope (either before or after the class declaration granting 5333 // friendship). 5334 // - If a friend function is called, its name may be found by the 5335 // name lookup that considers functions from namespaces and 5336 // classes associated with the types of the function arguments. 5337 // - When looking for a prior declaration of a class or a function 5338 // declared as a friend, scopes outside the innermost enclosing 5339 // namespace scope are not considered. 5340 5341 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5342 DeclarationName Name = GetNameForDeclarator(D); 5343 assert(Name); 5344 5345 // The context we found the declaration in, or in which we should 5346 // create the declaration. 5347 DeclContext *DC; 5348 5349 // FIXME: handle local classes 5350 5351 // Recover from invalid scope qualifiers as if they just weren't there. 5352 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5353 ForRedeclaration); 5354 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5355 // FIXME: RequireCompleteDeclContext 5356 DC = computeDeclContext(ScopeQual); 5357 5358 // FIXME: handle dependent contexts 5359 if (!DC) return DeclPtrTy(); 5360 5361 LookupQualifiedName(Previous, DC); 5362 5363 // If searching in that context implicitly found a declaration in 5364 // a different context, treat it like it wasn't found at all. 5365 // TODO: better diagnostics for this case. Suggesting the right 5366 // qualified scope would be nice... 5367 // FIXME: getRepresentativeDecl() is not right here at all 5368 if (Previous.empty() || 5369 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5370 D.setInvalidType(); 5371 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5372 return DeclPtrTy(); 5373 } 5374 5375 // C++ [class.friend]p1: A friend of a class is a function or 5376 // class that is not a member of the class . . . 5377 if (DC->Equals(CurContext)) 5378 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5379 5380 // Otherwise walk out to the nearest namespace scope looking for matches. 5381 } else { 5382 // TODO: handle local class contexts. 5383 5384 DC = CurContext; 5385 while (true) { 5386 // Skip class contexts. If someone can cite chapter and verse 5387 // for this behavior, that would be nice --- it's what GCC and 5388 // EDG do, and it seems like a reasonable intent, but the spec 5389 // really only says that checks for unqualified existing 5390 // declarations should stop at the nearest enclosing namespace, 5391 // not that they should only consider the nearest enclosing 5392 // namespace. 5393 while (DC->isRecord()) 5394 DC = DC->getParent(); 5395 5396 LookupQualifiedName(Previous, DC); 5397 5398 // TODO: decide what we think about using declarations. 5399 if (!Previous.empty()) 5400 break; 5401 5402 if (DC->isFileContext()) break; 5403 DC = DC->getParent(); 5404 } 5405 5406 // C++ [class.friend]p1: A friend of a class is a function or 5407 // class that is not a member of the class . . . 5408 // C++0x changes this for both friend types and functions. 5409 // Most C++ 98 compilers do seem to give an error here, so 5410 // we do, too. 5411 if (!Previous.empty() && DC->Equals(CurContext) 5412 && !getLangOptions().CPlusPlus0x) 5413 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5414 } 5415 5416 if (DC->isFileContext()) { 5417 // This implies that it has to be an operator or function. 5418 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5419 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5420 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5421 Diag(Loc, diag::err_introducing_special_friend) << 5422 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5423 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5424 return DeclPtrTy(); 5425 } 5426 } 5427 5428 bool Redeclaration = false; 5429 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5430 move(TemplateParams), 5431 IsDefinition, 5432 Redeclaration); 5433 if (!ND) return DeclPtrTy(); 5434 5435 assert(ND->getDeclContext() == DC); 5436 assert(ND->getLexicalDeclContext() == CurContext); 5437 5438 // Add the function declaration to the appropriate lookup tables, 5439 // adjusting the redeclarations list as necessary. We don't 5440 // want to do this yet if the friending class is dependent. 5441 // 5442 // Also update the scope-based lookup if the target context's 5443 // lookup context is in lexical scope. 5444 if (!CurContext->isDependentContext()) { 5445 DC = DC->getLookupContext(); 5446 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5447 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5448 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5449 } 5450 5451 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5452 D.getIdentifierLoc(), ND, 5453 DS.getFriendSpecLoc()); 5454 FrD->setAccess(AS_public); 5455 CurContext->addDecl(FrD); 5456 5457 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) 5458 FrD->setSpecialization(true); 5459 5460 return DeclPtrTy::make(ND); 5461} 5462 5463void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5464 AdjustDeclIfTemplate(dcl); 5465 5466 Decl *Dcl = dcl.getAs<Decl>(); 5467 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5468 if (!Fn) { 5469 Diag(DelLoc, diag::err_deleted_non_function); 5470 return; 5471 } 5472 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5473 Diag(DelLoc, diag::err_deleted_decl_not_first); 5474 Diag(Prev->getLocation(), diag::note_previous_declaration); 5475 // If the declaration wasn't the first, we delete the function anyway for 5476 // recovery. 5477 } 5478 Fn->setDeleted(); 5479} 5480 5481static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5482 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5483 ++CI) { 5484 Stmt *SubStmt = *CI; 5485 if (!SubStmt) 5486 continue; 5487 if (isa<ReturnStmt>(SubStmt)) 5488 Self.Diag(SubStmt->getSourceRange().getBegin(), 5489 diag::err_return_in_constructor_handler); 5490 if (!isa<Expr>(SubStmt)) 5491 SearchForReturnInStmt(Self, SubStmt); 5492 } 5493} 5494 5495void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5496 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5497 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5498 SearchForReturnInStmt(*this, Handler); 5499 } 5500} 5501 5502bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5503 const CXXMethodDecl *Old) { 5504 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5505 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5506 5507 QualType CNewTy = Context.getCanonicalType(NewTy); 5508 QualType COldTy = Context.getCanonicalType(OldTy); 5509 5510 if (CNewTy == COldTy && 5511 CNewTy.getLocalCVRQualifiers() == COldTy.getLocalCVRQualifiers()) 5512 return false; 5513 5514 // Check if the return types are covariant 5515 QualType NewClassTy, OldClassTy; 5516 5517 /// Both types must be pointers or references to classes. 5518 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 5519 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 5520 NewClassTy = NewPT->getPointeeType(); 5521 OldClassTy = OldPT->getPointeeType(); 5522 } 5523 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 5524 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 5525 NewClassTy = NewRT->getPointeeType(); 5526 OldClassTy = OldRT->getPointeeType(); 5527 } 5528 } 5529 5530 // The return types aren't either both pointers or references to a class type. 5531 if (NewClassTy.isNull()) { 5532 Diag(New->getLocation(), 5533 diag::err_different_return_type_for_overriding_virtual_function) 5534 << New->getDeclName() << NewTy << OldTy; 5535 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5536 5537 return true; 5538 } 5539 5540 // C++ [class.virtual]p6: 5541 // If the return type of D::f differs from the return type of B::f, the 5542 // class type in the return type of D::f shall be complete at the point of 5543 // declaration of D::f or shall be the class type D. 5544 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5545 if (!RT->isBeingDefined() && 5546 RequireCompleteType(New->getLocation(), NewClassTy, 5547 PDiag(diag::err_covariant_return_incomplete) 5548 << New->getDeclName())) 5549 return true; 5550 } 5551 5552 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5553 // Check if the new class derives from the old class. 5554 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5555 Diag(New->getLocation(), 5556 diag::err_covariant_return_not_derived) 5557 << New->getDeclName() << NewTy << OldTy; 5558 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5559 return true; 5560 } 5561 5562 // Check if we the conversion from derived to base is valid. 5563 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5564 diag::err_covariant_return_inaccessible_base, 5565 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5566 // FIXME: Should this point to the return type? 5567 New->getLocation(), SourceRange(), New->getDeclName())) { 5568 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5569 return true; 5570 } 5571 } 5572 5573 // The qualifiers of the return types must be the same. 5574 if (CNewTy.getLocalCVRQualifiers() != COldTy.getLocalCVRQualifiers()) { 5575 Diag(New->getLocation(), 5576 diag::err_covariant_return_type_different_qualifications) 5577 << New->getDeclName() << NewTy << OldTy; 5578 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5579 return true; 5580 }; 5581 5582 5583 // The new class type must have the same or less qualifiers as the old type. 5584 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5585 Diag(New->getLocation(), 5586 diag::err_covariant_return_type_class_type_more_qualified) 5587 << New->getDeclName() << NewTy << OldTy; 5588 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5589 return true; 5590 }; 5591 5592 return false; 5593} 5594 5595bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5596 const CXXMethodDecl *Old) 5597{ 5598 if (Old->hasAttr<FinalAttr>()) { 5599 Diag(New->getLocation(), diag::err_final_function_overridden) 5600 << New->getDeclName(); 5601 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5602 return true; 5603 } 5604 5605 return false; 5606} 5607 5608/// \brief Mark the given method pure. 5609/// 5610/// \param Method the method to be marked pure. 5611/// 5612/// \param InitRange the source range that covers the "0" initializer. 5613bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5614 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5615 Method->setPure(); 5616 5617 // A class is abstract if at least one function is pure virtual. 5618 Method->getParent()->setAbstract(true); 5619 return false; 5620 } 5621 5622 if (!Method->isInvalidDecl()) 5623 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5624 << Method->getDeclName() << InitRange; 5625 return true; 5626} 5627 5628/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5629/// an initializer for the out-of-line declaration 'Dcl'. The scope 5630/// is a fresh scope pushed for just this purpose. 5631/// 5632/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5633/// static data member of class X, names should be looked up in the scope of 5634/// class X. 5635void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5636 // If there is no declaration, there was an error parsing it. 5637 Decl *D = Dcl.getAs<Decl>(); 5638 if (D == 0) return; 5639 5640 // We should only get called for declarations with scope specifiers, like: 5641 // int foo::bar; 5642 assert(D->isOutOfLine()); 5643 EnterDeclaratorContext(S, D->getDeclContext()); 5644} 5645 5646/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5647/// initializer for the out-of-line declaration 'Dcl'. 5648void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5649 // If there is no declaration, there was an error parsing it. 5650 Decl *D = Dcl.getAs<Decl>(); 5651 if (D == 0) return; 5652 5653 assert(D->isOutOfLine()); 5654 ExitDeclaratorContext(S); 5655} 5656 5657/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5658/// C++ if/switch/while/for statement. 5659/// e.g: "if (int x = f()) {...}" 5660Action::DeclResult 5661Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5662 // C++ 6.4p2: 5663 // The declarator shall not specify a function or an array. 5664 // The type-specifier-seq shall not contain typedef and shall not declare a 5665 // new class or enumeration. 5666 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5667 "Parser allowed 'typedef' as storage class of condition decl."); 5668 5669 TypeSourceInfo *TInfo = 0; 5670 TagDecl *OwnedTag = 0; 5671 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5672 5673 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5674 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5675 // would be created and CXXConditionDeclExpr wants a VarDecl. 5676 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5677 << D.getSourceRange(); 5678 return DeclResult(); 5679 } else if (OwnedTag && OwnedTag->isDefinition()) { 5680 // The type-specifier-seq shall not declare a new class or enumeration. 5681 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5682 } 5683 5684 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5685 if (!Dcl) 5686 return DeclResult(); 5687 5688 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5689 VD->setDeclaredInCondition(true); 5690 return Dcl; 5691} 5692 5693void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5694 CXXMethodDecl *MD) { 5695 // Ignore dependent types. 5696 if (MD->isDependentContext()) 5697 return; 5698 5699 CXXRecordDecl *RD = MD->getParent(); 5700 5701 // Ignore classes without a vtable. 5702 if (!RD->isDynamicClass()) 5703 return; 5704 5705 // Ignore declarations that are not definitions. 5706 if (!MD->isThisDeclarationADefinition()) 5707 return; 5708 5709 if (isa<CXXConstructorDecl>(MD)) { 5710 switch (MD->getParent()->getTemplateSpecializationKind()) { 5711 case TSK_Undeclared: 5712 case TSK_ExplicitSpecialization: 5713 // Classes that aren't instantiations of templates don't need their 5714 // virtual methods marked until we see the definition of the key 5715 // function. 5716 return; 5717 5718 case TSK_ImplicitInstantiation: 5719 case TSK_ExplicitInstantiationDeclaration: 5720 case TSK_ExplicitInstantiationDefinition: 5721 // This is a constructor of a class template; mark all of the virtual 5722 // members as referenced to ensure that they get instantiatied. 5723 break; 5724 } 5725 } else if (!MD->isOutOfLine()) { 5726 // Consider only out-of-line definitions of member functions. When we see 5727 // an inline definition, it's too early to compute the key function. 5728 return; 5729 } else if (const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD)) { 5730 // If this is not the key function, we don't need to mark virtual members. 5731 if (KeyFunction->getCanonicalDecl() != MD->getCanonicalDecl()) 5732 return; 5733 } else { 5734 // The class has no key function, so we've already noted that we need to 5735 // mark the virtual members of this class. 5736 return; 5737 } 5738 5739 // We will need to mark all of the virtual members as referenced to build the 5740 // vtable. 5741 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 5742} 5743 5744bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5745 if (ClassesWithUnmarkedVirtualMembers.empty()) 5746 return false; 5747 5748 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 5749 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 5750 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 5751 ClassesWithUnmarkedVirtualMembers.pop_back(); 5752 MarkVirtualMembersReferenced(Loc, RD); 5753 } 5754 5755 return true; 5756} 5757 5758void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, CXXRecordDecl *RD) { 5759 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5760 e = RD->method_end(); i != e; ++i) { 5761 CXXMethodDecl *MD = *i; 5762 5763 // C++ [basic.def.odr]p2: 5764 // [...] A virtual member function is used if it is not pure. [...] 5765 if (MD->isVirtual() && !MD->isPure()) 5766 MarkDeclarationReferenced(Loc, MD); 5767 } 5768} 5769 5770