SemaDeclCXX.cpp revision 1d31833450e6d2947a33cb0840d87661d92eec07
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 assert(getLangOptions().CPlusPlus && "No class names in C!"); 428 429 CXXRecordDecl *CurDecl; 430 if (SS && SS->isSet() && !SS->isInvalid()) { 431 DeclContext *DC = computeDeclContext(*SS, true); 432 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 433 } else 434 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 435 436 if (CurDecl) 437 return &II == CurDecl->getIdentifier(); 438 else 439 return false; 440} 441 442/// \brief Check the validity of a C++ base class specifier. 443/// 444/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 445/// and returns NULL otherwise. 446CXXBaseSpecifier * 447Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 448 SourceRange SpecifierRange, 449 bool Virtual, AccessSpecifier Access, 450 QualType BaseType, 451 SourceLocation BaseLoc) { 452 // C++ [class.union]p1: 453 // A union shall not have base classes. 454 if (Class->isUnion()) { 455 Diag(Class->getLocation(), diag::err_base_clause_on_union) 456 << SpecifierRange; 457 return 0; 458 } 459 460 if (BaseType->isDependentType()) 461 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 462 Class->getTagKind() == RecordDecl::TK_class, 463 Access, BaseType); 464 465 // Base specifiers must be record types. 466 if (!BaseType->isRecordType()) { 467 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 468 return 0; 469 } 470 471 // C++ [class.union]p1: 472 // A union shall not be used as a base class. 473 if (BaseType->isUnionType()) { 474 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 475 return 0; 476 } 477 478 // C++ [class.derived]p2: 479 // The class-name in a base-specifier shall not be an incompletely 480 // defined class. 481 if (RequireCompleteType(BaseLoc, BaseType, 482 PDiag(diag::err_incomplete_base_class) 483 << SpecifierRange)) 484 return 0; 485 486 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 487 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 488 assert(BaseDecl && "Record type has no declaration"); 489 BaseDecl = BaseDecl->getDefinition(Context); 490 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 491 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 492 assert(CXXBaseDecl && "Base type is not a C++ type"); 493 494 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 495 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 496 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 497 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 498 << BaseType; 499 return 0; 500 } 501 502 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 503 504 // Create the base specifier. 505 // FIXME: Allocate via ASTContext? 506 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 507 Class->getTagKind() == RecordDecl::TK_class, 508 Access, BaseType); 509} 510 511void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 512 const CXXRecordDecl *BaseClass, 513 bool BaseIsVirtual) { 514 // A class with a non-empty base class is not empty. 515 // FIXME: Standard ref? 516 if (!BaseClass->isEmpty()) 517 Class->setEmpty(false); 518 519 // C++ [class.virtual]p1: 520 // A class that [...] inherits a virtual function is called a polymorphic 521 // class. 522 if (BaseClass->isPolymorphic()) 523 Class->setPolymorphic(true); 524 525 // C++ [dcl.init.aggr]p1: 526 // An aggregate is [...] a class with [...] no base classes [...]. 527 Class->setAggregate(false); 528 529 // C++ [class]p4: 530 // A POD-struct is an aggregate class... 531 Class->setPOD(false); 532 533 if (BaseIsVirtual) { 534 // C++ [class.ctor]p5: 535 // A constructor is trivial if its class has no virtual base classes. 536 Class->setHasTrivialConstructor(false); 537 538 // C++ [class.copy]p6: 539 // A copy constructor is trivial if its class has no virtual base classes. 540 Class->setHasTrivialCopyConstructor(false); 541 542 // C++ [class.copy]p11: 543 // A copy assignment operator is trivial if its class has no virtual 544 // base classes. 545 Class->setHasTrivialCopyAssignment(false); 546 547 // C++0x [meta.unary.prop] is_empty: 548 // T is a class type, but not a union type, with ... no virtual base 549 // classes 550 Class->setEmpty(false); 551 } else { 552 // C++ [class.ctor]p5: 553 // A constructor is trivial if all the direct base classes of its 554 // class have trivial constructors. 555 if (!BaseClass->hasTrivialConstructor()) 556 Class->setHasTrivialConstructor(false); 557 558 // C++ [class.copy]p6: 559 // A copy constructor is trivial if all the direct base classes of its 560 // class have trivial copy constructors. 561 if (!BaseClass->hasTrivialCopyConstructor()) 562 Class->setHasTrivialCopyConstructor(false); 563 564 // C++ [class.copy]p11: 565 // A copy assignment operator is trivial if all the direct base classes 566 // of its class have trivial copy assignment operators. 567 if (!BaseClass->hasTrivialCopyAssignment()) 568 Class->setHasTrivialCopyAssignment(false); 569 } 570 571 // C++ [class.ctor]p3: 572 // A destructor is trivial if all the direct base classes of its class 573 // have trivial destructors. 574 if (!BaseClass->hasTrivialDestructor()) 575 Class->setHasTrivialDestructor(false); 576} 577 578/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 579/// one entry in the base class list of a class specifier, for 580/// example: 581/// class foo : public bar, virtual private baz { 582/// 'public bar' and 'virtual private baz' are each base-specifiers. 583Sema::BaseResult 584Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 585 bool Virtual, AccessSpecifier Access, 586 TypeTy *basetype, SourceLocation BaseLoc) { 587 if (!classdecl) 588 return true; 589 590 AdjustDeclIfTemplate(classdecl); 591 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 592 QualType BaseType = GetTypeFromParser(basetype); 593 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 594 Virtual, Access, 595 BaseType, BaseLoc)) 596 return BaseSpec; 597 598 return true; 599} 600 601/// \brief Performs the actual work of attaching the given base class 602/// specifiers to a C++ class. 603bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 604 unsigned NumBases) { 605 if (NumBases == 0) 606 return false; 607 608 // Used to keep track of which base types we have already seen, so 609 // that we can properly diagnose redundant direct base types. Note 610 // that the key is always the unqualified canonical type of the base 611 // class. 612 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 613 614 // Copy non-redundant base specifiers into permanent storage. 615 unsigned NumGoodBases = 0; 616 bool Invalid = false; 617 for (unsigned idx = 0; idx < NumBases; ++idx) { 618 QualType NewBaseType 619 = Context.getCanonicalType(Bases[idx]->getType()); 620 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 621 622 if (KnownBaseTypes[NewBaseType]) { 623 // C++ [class.mi]p3: 624 // A class shall not be specified as a direct base class of a 625 // derived class more than once. 626 Diag(Bases[idx]->getSourceRange().getBegin(), 627 diag::err_duplicate_base_class) 628 << KnownBaseTypes[NewBaseType]->getType() 629 << Bases[idx]->getSourceRange(); 630 631 // Delete the duplicate base class specifier; we're going to 632 // overwrite its pointer later. 633 Context.Deallocate(Bases[idx]); 634 635 Invalid = true; 636 } else { 637 // Okay, add this new base class. 638 KnownBaseTypes[NewBaseType] = Bases[idx]; 639 Bases[NumGoodBases++] = Bases[idx]; 640 } 641 } 642 643 // Attach the remaining base class specifiers to the derived class. 644 Class->setBases(Context, Bases, NumGoodBases); 645 646 // Delete the remaining (good) base class specifiers, since their 647 // data has been copied into the CXXRecordDecl. 648 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 649 Context.Deallocate(Bases[idx]); 650 651 return Invalid; 652} 653 654/// ActOnBaseSpecifiers - Attach the given base specifiers to the 655/// class, after checking whether there are any duplicate base 656/// classes. 657void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 658 unsigned NumBases) { 659 if (!ClassDecl || !Bases || !NumBases) 660 return; 661 662 AdjustDeclIfTemplate(ClassDecl); 663 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 664 (CXXBaseSpecifier**)(Bases), NumBases); 665} 666 667/// \brief Determine whether the type \p Derived is a C++ class that is 668/// derived from the type \p Base. 669bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 670 if (!getLangOptions().CPlusPlus) 671 return false; 672 673 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 674 if (!DerivedRT) 675 return false; 676 677 const RecordType *BaseRT = Base->getAs<RecordType>(); 678 if (!BaseRT) 679 return false; 680 681 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 682 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 683 return DerivedRD->isDerivedFrom(BaseRD); 684} 685 686/// \brief Determine whether the type \p Derived is a C++ class that is 687/// derived from the type \p Base. 688bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 689 if (!getLangOptions().CPlusPlus) 690 return false; 691 692 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 693 if (!DerivedRT) 694 return false; 695 696 const RecordType *BaseRT = Base->getAs<RecordType>(); 697 if (!BaseRT) 698 return false; 699 700 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 701 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 702 return DerivedRD->isDerivedFrom(BaseRD, Paths); 703} 704 705/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 706/// conversion (where Derived and Base are class types) is 707/// well-formed, meaning that the conversion is unambiguous (and 708/// that all of the base classes are accessible). Returns true 709/// and emits a diagnostic if the code is ill-formed, returns false 710/// otherwise. Loc is the location where this routine should point to 711/// if there is an error, and Range is the source range to highlight 712/// if there is an error. 713bool 714Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 715 unsigned InaccessibleBaseID, 716 unsigned AmbigiousBaseConvID, 717 SourceLocation Loc, SourceRange Range, 718 DeclarationName Name) { 719 // First, determine whether the path from Derived to Base is 720 // ambiguous. This is slightly more expensive than checking whether 721 // the Derived to Base conversion exists, because here we need to 722 // explore multiple paths to determine if there is an ambiguity. 723 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 724 /*DetectVirtual=*/false); 725 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 726 assert(DerivationOkay && 727 "Can only be used with a derived-to-base conversion"); 728 (void)DerivationOkay; 729 730 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 731 if (InaccessibleBaseID == 0) 732 return false; 733 // Check that the base class can be accessed. 734 return CheckBaseClassAccess(Derived, Base, InaccessibleBaseID, Paths, Loc, 735 Name); 736 } 737 738 // We know that the derived-to-base conversion is ambiguous, and 739 // we're going to produce a diagnostic. Perform the derived-to-base 740 // search just one more time to compute all of the possible paths so 741 // that we can print them out. This is more expensive than any of 742 // the previous derived-to-base checks we've done, but at this point 743 // performance isn't as much of an issue. 744 Paths.clear(); 745 Paths.setRecordingPaths(true); 746 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 747 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 748 (void)StillOkay; 749 750 // Build up a textual representation of the ambiguous paths, e.g., 751 // D -> B -> A, that will be used to illustrate the ambiguous 752 // conversions in the diagnostic. We only print one of the paths 753 // to each base class subobject. 754 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 755 756 Diag(Loc, AmbigiousBaseConvID) 757 << Derived << Base << PathDisplayStr << Range << Name; 758 return true; 759} 760 761bool 762Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 763 SourceLocation Loc, SourceRange Range, 764 bool IgnoreAccess) { 765 return CheckDerivedToBaseConversion(Derived, Base, 766 IgnoreAccess ? 0 : 767 diag::err_conv_to_inaccessible_base, 768 diag::err_ambiguous_derived_to_base_conv, 769 Loc, Range, DeclarationName()); 770} 771 772 773/// @brief Builds a string representing ambiguous paths from a 774/// specific derived class to different subobjects of the same base 775/// class. 776/// 777/// This function builds a string that can be used in error messages 778/// to show the different paths that one can take through the 779/// inheritance hierarchy to go from the derived class to different 780/// subobjects of a base class. The result looks something like this: 781/// @code 782/// struct D -> struct B -> struct A 783/// struct D -> struct C -> struct A 784/// @endcode 785std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 786 std::string PathDisplayStr; 787 std::set<unsigned> DisplayedPaths; 788 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 789 Path != Paths.end(); ++Path) { 790 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 791 // We haven't displayed a path to this particular base 792 // class subobject yet. 793 PathDisplayStr += "\n "; 794 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 795 for (CXXBasePath::const_iterator Element = Path->begin(); 796 Element != Path->end(); ++Element) 797 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 798 } 799 } 800 801 return PathDisplayStr; 802} 803 804//===----------------------------------------------------------------------===// 805// C++ class member Handling 806//===----------------------------------------------------------------------===// 807 808/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 809/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 810/// bitfield width if there is one and 'InitExpr' specifies the initializer if 811/// any. 812Sema::DeclPtrTy 813Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 814 MultiTemplateParamsArg TemplateParameterLists, 815 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 816 bool Deleted) { 817 const DeclSpec &DS = D.getDeclSpec(); 818 DeclarationName Name = GetNameForDeclarator(D); 819 Expr *BitWidth = static_cast<Expr*>(BW); 820 Expr *Init = static_cast<Expr*>(InitExpr); 821 SourceLocation Loc = D.getIdentifierLoc(); 822 823 bool isFunc = D.isFunctionDeclarator(); 824 825 assert(!DS.isFriendSpecified()); 826 827 // C++ 9.2p6: A member shall not be declared to have automatic storage 828 // duration (auto, register) or with the extern storage-class-specifier. 829 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 830 // data members and cannot be applied to names declared const or static, 831 // and cannot be applied to reference members. 832 switch (DS.getStorageClassSpec()) { 833 case DeclSpec::SCS_unspecified: 834 case DeclSpec::SCS_typedef: 835 case DeclSpec::SCS_static: 836 // FALL THROUGH. 837 break; 838 case DeclSpec::SCS_mutable: 839 if (isFunc) { 840 if (DS.getStorageClassSpecLoc().isValid()) 841 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 842 else 843 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 844 845 // FIXME: It would be nicer if the keyword was ignored only for this 846 // declarator. Otherwise we could get follow-up errors. 847 D.getMutableDeclSpec().ClearStorageClassSpecs(); 848 } else { 849 QualType T = GetTypeForDeclarator(D, S); 850 diag::kind err = static_cast<diag::kind>(0); 851 if (T->isReferenceType()) 852 err = diag::err_mutable_reference; 853 else if (T.isConstQualified()) 854 err = diag::err_mutable_const; 855 if (err != 0) { 856 if (DS.getStorageClassSpecLoc().isValid()) 857 Diag(DS.getStorageClassSpecLoc(), err); 858 else 859 Diag(DS.getThreadSpecLoc(), err); 860 // FIXME: It would be nicer if the keyword was ignored only for this 861 // declarator. Otherwise we could get follow-up errors. 862 D.getMutableDeclSpec().ClearStorageClassSpecs(); 863 } 864 } 865 break; 866 default: 867 if (DS.getStorageClassSpecLoc().isValid()) 868 Diag(DS.getStorageClassSpecLoc(), 869 diag::err_storageclass_invalid_for_member); 870 else 871 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 872 D.getMutableDeclSpec().ClearStorageClassSpecs(); 873 } 874 875 if (!isFunc && 876 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 877 D.getNumTypeObjects() == 0) { 878 // Check also for this case: 879 // 880 // typedef int f(); 881 // f a; 882 // 883 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 884 isFunc = TDType->isFunctionType(); 885 } 886 887 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 888 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 889 !isFunc); 890 891 Decl *Member; 892 if (isInstField) { 893 // FIXME: Check for template parameters! 894 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 895 AS); 896 assert(Member && "HandleField never returns null"); 897 } else { 898 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 899 .getAs<Decl>(); 900 if (!Member) { 901 if (BitWidth) DeleteExpr(BitWidth); 902 return DeclPtrTy(); 903 } 904 905 // Non-instance-fields can't have a bitfield. 906 if (BitWidth) { 907 if (Member->isInvalidDecl()) { 908 // don't emit another diagnostic. 909 } else if (isa<VarDecl>(Member)) { 910 // C++ 9.6p3: A bit-field shall not be a static member. 911 // "static member 'A' cannot be a bit-field" 912 Diag(Loc, diag::err_static_not_bitfield) 913 << Name << BitWidth->getSourceRange(); 914 } else if (isa<TypedefDecl>(Member)) { 915 // "typedef member 'x' cannot be a bit-field" 916 Diag(Loc, diag::err_typedef_not_bitfield) 917 << Name << BitWidth->getSourceRange(); 918 } else { 919 // A function typedef ("typedef int f(); f a;"). 920 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 921 Diag(Loc, diag::err_not_integral_type_bitfield) 922 << Name << cast<ValueDecl>(Member)->getType() 923 << BitWidth->getSourceRange(); 924 } 925 926 DeleteExpr(BitWidth); 927 BitWidth = 0; 928 Member->setInvalidDecl(); 929 } 930 931 Member->setAccess(AS); 932 933 // If we have declared a member function template, set the access of the 934 // templated declaration as well. 935 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 936 FunTmpl->getTemplatedDecl()->setAccess(AS); 937 } 938 939 assert((Name || isInstField) && "No identifier for non-field ?"); 940 941 if (Init) 942 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 943 if (Deleted) // FIXME: Source location is not very good. 944 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 945 946 if (isInstField) { 947 FieldCollector->Add(cast<FieldDecl>(Member)); 948 return DeclPtrTy(); 949 } 950 return DeclPtrTy::make(Member); 951} 952 953/// \brief Find the direct and/or virtual base specifiers that 954/// correspond to the given base type, for use in base initialization 955/// within a constructor. 956static bool FindBaseInitializer(Sema &SemaRef, 957 CXXRecordDecl *ClassDecl, 958 QualType BaseType, 959 const CXXBaseSpecifier *&DirectBaseSpec, 960 const CXXBaseSpecifier *&VirtualBaseSpec) { 961 // First, check for a direct base class. 962 DirectBaseSpec = 0; 963 for (CXXRecordDecl::base_class_const_iterator Base 964 = ClassDecl->bases_begin(); 965 Base != ClassDecl->bases_end(); ++Base) { 966 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 967 // We found a direct base of this type. That's what we're 968 // initializing. 969 DirectBaseSpec = &*Base; 970 break; 971 } 972 } 973 974 // Check for a virtual base class. 975 // FIXME: We might be able to short-circuit this if we know in advance that 976 // there are no virtual bases. 977 VirtualBaseSpec = 0; 978 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 979 // We haven't found a base yet; search the class hierarchy for a 980 // virtual base class. 981 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 982 /*DetectVirtual=*/false); 983 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 984 BaseType, Paths)) { 985 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 986 Path != Paths.end(); ++Path) { 987 if (Path->back().Base->isVirtual()) { 988 VirtualBaseSpec = Path->back().Base; 989 break; 990 } 991 } 992 } 993 } 994 995 return DirectBaseSpec || VirtualBaseSpec; 996} 997 998/// ActOnMemInitializer - Handle a C++ member initializer. 999Sema::MemInitResult 1000Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1001 Scope *S, 1002 const CXXScopeSpec &SS, 1003 IdentifierInfo *MemberOrBase, 1004 TypeTy *TemplateTypeTy, 1005 SourceLocation IdLoc, 1006 SourceLocation LParenLoc, 1007 ExprTy **Args, unsigned NumArgs, 1008 SourceLocation *CommaLocs, 1009 SourceLocation RParenLoc) { 1010 if (!ConstructorD) 1011 return true; 1012 1013 AdjustDeclIfTemplate(ConstructorD); 1014 1015 CXXConstructorDecl *Constructor 1016 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1017 if (!Constructor) { 1018 // The user wrote a constructor initializer on a function that is 1019 // not a C++ constructor. Ignore the error for now, because we may 1020 // have more member initializers coming; we'll diagnose it just 1021 // once in ActOnMemInitializers. 1022 return true; 1023 } 1024 1025 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1026 1027 // C++ [class.base.init]p2: 1028 // Names in a mem-initializer-id are looked up in the scope of the 1029 // constructor’s class and, if not found in that scope, are looked 1030 // up in the scope containing the constructor’s 1031 // definition. [Note: if the constructor’s class contains a member 1032 // with the same name as a direct or virtual base class of the 1033 // class, a mem-initializer-id naming the member or base class and 1034 // composed of a single identifier refers to the class member. A 1035 // mem-initializer-id for the hidden base class may be specified 1036 // using a qualified name. ] 1037 if (!SS.getScopeRep() && !TemplateTypeTy) { 1038 // Look for a member, first. 1039 FieldDecl *Member = 0; 1040 DeclContext::lookup_result Result 1041 = ClassDecl->lookup(MemberOrBase); 1042 if (Result.first != Result.second) 1043 Member = dyn_cast<FieldDecl>(*Result.first); 1044 1045 // FIXME: Handle members of an anonymous union. 1046 1047 if (Member) 1048 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1049 LParenLoc, RParenLoc); 1050 } 1051 // It didn't name a member, so see if it names a class. 1052 QualType BaseType; 1053 TypeSourceInfo *TInfo = 0; 1054 1055 if (TemplateTypeTy) { 1056 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1057 } else { 1058 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1059 LookupParsedName(R, S, &SS); 1060 1061 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1062 if (!TyD) { 1063 if (R.isAmbiguous()) return true; 1064 1065 // If no results were found, try to correct typos. 1066 if (R.empty() && 1067 CorrectTypo(R, S, &SS, ClassDecl) && R.isSingleResult()) { 1068 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1069 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1070 // We have found a non-static data member with a similar 1071 // name to what was typed; complain and initialize that 1072 // member. 1073 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1074 << MemberOrBase << true << R.getLookupName() 1075 << CodeModificationHint::CreateReplacement(R.getNameLoc(), 1076 R.getLookupName().getAsString()); 1077 Diag(Member->getLocation(), diag::note_previous_decl) 1078 << Member->getDeclName(); 1079 1080 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1081 LParenLoc, RParenLoc); 1082 } 1083 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1084 const CXXBaseSpecifier *DirectBaseSpec; 1085 const CXXBaseSpecifier *VirtualBaseSpec; 1086 if (FindBaseInitializer(*this, ClassDecl, 1087 Context.getTypeDeclType(Type), 1088 DirectBaseSpec, VirtualBaseSpec)) { 1089 // We have found a direct or virtual base class with a 1090 // similar name to what was typed; complain and initialize 1091 // that base class. 1092 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1093 << MemberOrBase << false << R.getLookupName() 1094 << CodeModificationHint::CreateReplacement(R.getNameLoc(), 1095 R.getLookupName().getAsString()); 1096 1097 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1098 : VirtualBaseSpec; 1099 Diag(BaseSpec->getSourceRange().getBegin(), 1100 diag::note_base_class_specified_here) 1101 << BaseSpec->getType() 1102 << BaseSpec->getSourceRange(); 1103 1104 TyD = Type; 1105 } 1106 } 1107 } 1108 1109 if (!TyD) { 1110 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1111 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1112 return true; 1113 } 1114 } 1115 1116 BaseType = Context.getTypeDeclType(TyD); 1117 if (SS.isSet()) { 1118 NestedNameSpecifier *Qualifier = 1119 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1120 1121 // FIXME: preserve source range information 1122 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1123 } 1124 } 1125 1126 if (!TInfo) 1127 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1128 1129 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1130 LParenLoc, RParenLoc, ClassDecl); 1131} 1132 1133/// Checks an initializer expression for use of uninitialized fields, such as 1134/// containing the field that is being initialized. Returns true if there is an 1135/// uninitialized field was used an updates the SourceLocation parameter; false 1136/// otherwise. 1137static bool InitExprContainsUninitializedFields(const Stmt* S, 1138 const FieldDecl* LhsField, 1139 SourceLocation* L) { 1140 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1141 if (ME) { 1142 const NamedDecl* RhsField = ME->getMemberDecl(); 1143 if (RhsField == LhsField) { 1144 // Initializing a field with itself. Throw a warning. 1145 // But wait; there are exceptions! 1146 // Exception #1: The field may not belong to this record. 1147 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1148 const Expr* base = ME->getBase(); 1149 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1150 // Even though the field matches, it does not belong to this record. 1151 return false; 1152 } 1153 // None of the exceptions triggered; return true to indicate an 1154 // uninitialized field was used. 1155 *L = ME->getMemberLoc(); 1156 return true; 1157 } 1158 } 1159 bool found = false; 1160 for (Stmt::const_child_iterator it = S->child_begin(); 1161 it != S->child_end() && found == false; 1162 ++it) { 1163 if (isa<CallExpr>(S)) { 1164 // Do not descend into function calls or constructors, as the use 1165 // of an uninitialized field may be valid. One would have to inspect 1166 // the contents of the function/ctor to determine if it is safe or not. 1167 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1168 // may be safe, depending on what the function/ctor does. 1169 continue; 1170 } 1171 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1172 } 1173 return found; 1174} 1175 1176Sema::MemInitResult 1177Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1178 unsigned NumArgs, SourceLocation IdLoc, 1179 SourceLocation LParenLoc, 1180 SourceLocation RParenLoc) { 1181 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1182 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1183 ExprTemporaries.clear(); 1184 1185 // Diagnose value-uses of fields to initialize themselves, e.g. 1186 // foo(foo) 1187 // where foo is not also a parameter to the constructor. 1188 // TODO: implement -Wuninitialized and fold this into that framework. 1189 for (unsigned i = 0; i < NumArgs; ++i) { 1190 SourceLocation L; 1191 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1192 // FIXME: Return true in the case when other fields are used before being 1193 // uninitialized. For example, let this field be the i'th field. When 1194 // initializing the i'th field, throw a warning if any of the >= i'th 1195 // fields are used, as they are not yet initialized. 1196 // Right now we are only handling the case where the i'th field uses 1197 // itself in its initializer. 1198 Diag(L, diag::warn_field_is_uninit); 1199 } 1200 } 1201 1202 bool HasDependentArg = false; 1203 for (unsigned i = 0; i < NumArgs; i++) 1204 HasDependentArg |= Args[i]->isTypeDependent(); 1205 1206 CXXConstructorDecl *C = 0; 1207 QualType FieldType = Member->getType(); 1208 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1209 FieldType = Array->getElementType(); 1210 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1211 if (FieldType->isDependentType()) { 1212 // Can't check init for dependent type. 1213 } else if (FieldType->isRecordType()) { 1214 // Member is a record (struct/union/class), so pass the initializer 1215 // arguments down to the record's constructor. 1216 if (!HasDependentArg) { 1217 C = PerformInitializationByConstructor(FieldType, 1218 MultiExprArg(*this, 1219 (void**)Args, 1220 NumArgs), 1221 IdLoc, 1222 SourceRange(IdLoc, RParenLoc), 1223 Member->getDeclName(), 1224 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc), 1225 ConstructorArgs); 1226 1227 if (C) { 1228 // Take over the constructor arguments as our own. 1229 NumArgs = ConstructorArgs.size(); 1230 Args = (Expr **)ConstructorArgs.take(); 1231 } 1232 } 1233 } else if (NumArgs != 1 && NumArgs != 0) { 1234 // The member type is not a record type (or an array of record 1235 // types), so it can be only be default- or copy-initialized. 1236 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 1237 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 1238 } else if (!HasDependentArg) { 1239 Expr *NewExp; 1240 if (NumArgs == 0) { 1241 if (FieldType->isReferenceType()) { 1242 Diag(IdLoc, diag::err_null_intialized_reference_member) 1243 << Member->getDeclName(); 1244 return Diag(Member->getLocation(), diag::note_declared_at); 1245 } 1246 NewExp = new (Context) CXXZeroInitValueExpr(FieldType, IdLoc, RParenLoc); 1247 NumArgs = 1; 1248 } 1249 else 1250 NewExp = (Expr*)Args[0]; 1251 if (!Member->isInvalidDecl() && 1252 PerformCopyInitialization(NewExp, FieldType, AA_Passing)) 1253 return true; 1254 Args[0] = NewExp; 1255 } 1256 1257 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1258 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1259 ExprTemporaries.clear(); 1260 1261 // FIXME: Perform direct initialization of the member. 1262 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1263 C, LParenLoc, (Expr **)Args, 1264 NumArgs, RParenLoc); 1265} 1266 1267Sema::MemInitResult 1268Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1269 Expr **Args, unsigned NumArgs, 1270 SourceLocation LParenLoc, SourceLocation RParenLoc, 1271 CXXRecordDecl *ClassDecl) { 1272 bool HasDependentArg = false; 1273 for (unsigned i = 0; i < NumArgs; i++) 1274 HasDependentArg |= Args[i]->isTypeDependent(); 1275 1276 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1277 if (!BaseType->isDependentType()) { 1278 if (!BaseType->isRecordType()) 1279 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1280 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1281 1282 // C++ [class.base.init]p2: 1283 // [...] Unless the mem-initializer-id names a nonstatic data 1284 // member of the constructor’s class or a direct or virtual base 1285 // of that class, the mem-initializer is ill-formed. A 1286 // mem-initializer-list can initialize a base class using any 1287 // name that denotes that base class type. 1288 1289 // Check for direct and virtual base classes. 1290 const CXXBaseSpecifier *DirectBaseSpec = 0; 1291 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1292 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1293 VirtualBaseSpec); 1294 1295 // C++ [base.class.init]p2: 1296 // If a mem-initializer-id is ambiguous because it designates both 1297 // a direct non-virtual base class and an inherited virtual base 1298 // class, the mem-initializer is ill-formed. 1299 if (DirectBaseSpec && VirtualBaseSpec) 1300 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1301 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1302 // C++ [base.class.init]p2: 1303 // Unless the mem-initializer-id names a nonstatic data membeer of the 1304 // constructor's class ot a direst or virtual base of that class, the 1305 // mem-initializer is ill-formed. 1306 if (!DirectBaseSpec && !VirtualBaseSpec) 1307 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1308 << BaseType << ClassDecl->getNameAsCString() 1309 << BaseTInfo->getTypeLoc().getSourceRange(); 1310 } 1311 1312 CXXConstructorDecl *C = 0; 1313 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1314 if (!BaseType->isDependentType() && !HasDependentArg) { 1315 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 1316 Context.getCanonicalType(BaseType).getUnqualifiedType()); 1317 1318 C = PerformInitializationByConstructor(BaseType, 1319 MultiExprArg(*this, 1320 (void**)Args, NumArgs), 1321 BaseLoc, 1322 SourceRange(BaseLoc, RParenLoc), 1323 Name, 1324 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc), 1325 ConstructorArgs); 1326 if (C) { 1327 // Take over the constructor arguments as our own. 1328 NumArgs = ConstructorArgs.size(); 1329 Args = (Expr **)ConstructorArgs.take(); 1330 } 1331 } 1332 1333 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1334 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1335 ExprTemporaries.clear(); 1336 1337 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, C, 1338 LParenLoc, (Expr **)Args, 1339 NumArgs, RParenLoc); 1340} 1341 1342bool 1343Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1344 CXXBaseOrMemberInitializer **Initializers, 1345 unsigned NumInitializers, 1346 bool IsImplicitConstructor) { 1347 // We need to build the initializer AST according to order of construction 1348 // and not what user specified in the Initializers list. 1349 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1350 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1351 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1352 bool HasDependentBaseInit = false; 1353 bool HadError = false; 1354 1355 for (unsigned i = 0; i < NumInitializers; i++) { 1356 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1357 if (Member->isBaseInitializer()) { 1358 if (Member->getBaseClass()->isDependentType()) 1359 HasDependentBaseInit = true; 1360 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1361 } else { 1362 AllBaseFields[Member->getMember()] = Member; 1363 } 1364 } 1365 1366 if (HasDependentBaseInit) { 1367 // FIXME. This does not preserve the ordering of the initializers. 1368 // Try (with -Wreorder) 1369 // template<class X> struct A {}; 1370 // template<class X> struct B : A<X> { 1371 // B() : x1(10), A<X>() {} 1372 // int x1; 1373 // }; 1374 // B<int> x; 1375 // On seeing one dependent type, we should essentially exit this routine 1376 // while preserving user-declared initializer list. When this routine is 1377 // called during instantiatiation process, this routine will rebuild the 1378 // ordered initializer list correctly. 1379 1380 // If we have a dependent base initialization, we can't determine the 1381 // association between initializers and bases; just dump the known 1382 // initializers into the list, and don't try to deal with other bases. 1383 for (unsigned i = 0; i < NumInitializers; i++) { 1384 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1385 if (Member->isBaseInitializer()) 1386 AllToInit.push_back(Member); 1387 } 1388 } else { 1389 // Push virtual bases before others. 1390 for (CXXRecordDecl::base_class_iterator VBase = 1391 ClassDecl->vbases_begin(), 1392 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1393 if (VBase->getType()->isDependentType()) 1394 continue; 1395 if (CXXBaseOrMemberInitializer *Value 1396 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1397 AllToInit.push_back(Value); 1398 } 1399 else { 1400 CXXRecordDecl *VBaseDecl = 1401 cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1402 assert(VBaseDecl && "SetBaseOrMemberInitializers - VBaseDecl null"); 1403 CXXConstructorDecl *Ctor = VBaseDecl->getDefaultConstructor(Context); 1404 if (!Ctor) { 1405 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1406 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1407 << 0 << VBase->getType(); 1408 Diag(VBaseDecl->getLocation(), diag::note_previous_decl) 1409 << Context.getTagDeclType(VBaseDecl); 1410 HadError = true; 1411 continue; 1412 } 1413 1414 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1415 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1416 Constructor->getLocation(), CtorArgs)) 1417 continue; 1418 1419 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1420 1421 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1422 // subexpression so we can wrap it in a CXXExprWithTemporaries if 1423 // necessary. 1424 // FIXME: Is there any better source-location information we can give? 1425 ExprTemporaries.clear(); 1426 CXXBaseOrMemberInitializer *Member = 1427 new (Context) CXXBaseOrMemberInitializer(Context, 1428 Context.getTrivialTypeSourceInfo(VBase->getType(), 1429 SourceLocation()), 1430 Ctor, 1431 SourceLocation(), 1432 CtorArgs.takeAs<Expr>(), 1433 CtorArgs.size(), 1434 SourceLocation()); 1435 AllToInit.push_back(Member); 1436 } 1437 } 1438 1439 for (CXXRecordDecl::base_class_iterator Base = 1440 ClassDecl->bases_begin(), 1441 E = ClassDecl->bases_end(); Base != E; ++Base) { 1442 // Virtuals are in the virtual base list and already constructed. 1443 if (Base->isVirtual()) 1444 continue; 1445 // Skip dependent types. 1446 if (Base->getType()->isDependentType()) 1447 continue; 1448 if (CXXBaseOrMemberInitializer *Value 1449 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1450 AllToInit.push_back(Value); 1451 } 1452 else { 1453 CXXRecordDecl *BaseDecl = 1454 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1455 assert(BaseDecl && "SetBaseOrMemberInitializers - BaseDecl null"); 1456 CXXConstructorDecl *Ctor = BaseDecl->getDefaultConstructor(Context); 1457 if (!Ctor) { 1458 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1459 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1460 << 0 << Base->getType(); 1461 Diag(BaseDecl->getLocation(), diag::note_previous_decl) 1462 << Context.getTagDeclType(BaseDecl); 1463 HadError = true; 1464 continue; 1465 } 1466 1467 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1468 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1469 Constructor->getLocation(), CtorArgs)) 1470 continue; 1471 1472 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1473 1474 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1475 // subexpression so we can wrap it in a CXXExprWithTemporaries if 1476 // necessary. 1477 // FIXME: Is there any better source-location information we can give? 1478 ExprTemporaries.clear(); 1479 CXXBaseOrMemberInitializer *Member = 1480 new (Context) CXXBaseOrMemberInitializer(Context, 1481 Context.getTrivialTypeSourceInfo(Base->getType(), 1482 SourceLocation()), 1483 Ctor, 1484 SourceLocation(), 1485 CtorArgs.takeAs<Expr>(), 1486 CtorArgs.size(), 1487 SourceLocation()); 1488 AllToInit.push_back(Member); 1489 } 1490 } 1491 } 1492 1493 // non-static data members. 1494 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1495 E = ClassDecl->field_end(); Field != E; ++Field) { 1496 if ((*Field)->isAnonymousStructOrUnion()) { 1497 if (const RecordType *FieldClassType = 1498 Field->getType()->getAs<RecordType>()) { 1499 CXXRecordDecl *FieldClassDecl 1500 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1501 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1502 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1503 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1504 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1505 // set to the anonymous union data member used in the initializer 1506 // list. 1507 Value->setMember(*Field); 1508 Value->setAnonUnionMember(*FA); 1509 AllToInit.push_back(Value); 1510 break; 1511 } 1512 } 1513 } 1514 continue; 1515 } 1516 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1517 AllToInit.push_back(Value); 1518 continue; 1519 } 1520 1521 if ((*Field)->getType()->isDependentType()) 1522 continue; 1523 1524 QualType FT = Context.getBaseElementType((*Field)->getType()); 1525 if (const RecordType* RT = FT->getAs<RecordType>()) { 1526 CXXConstructorDecl *Ctor = 1527 cast<CXXRecordDecl>(RT->getDecl())->getDefaultConstructor(Context); 1528 if (!Ctor) { 1529 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1530 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1531 << 1 << (*Field)->getDeclName(); 1532 Diag(Field->getLocation(), diag::note_field_decl); 1533 Diag(RT->getDecl()->getLocation(), diag::note_previous_decl) 1534 << Context.getTagDeclType(RT->getDecl()); 1535 HadError = true; 1536 continue; 1537 } 1538 1539 if (FT.isConstQualified() && Ctor->isTrivial()) { 1540 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1541 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1542 << 1 << (*Field)->getDeclName(); 1543 Diag((*Field)->getLocation(), diag::note_declared_at); 1544 HadError = true; 1545 } 1546 1547 // Don't create initializers for trivial constructors, since they don't 1548 // actually need to be run. 1549 if (Ctor->isTrivial()) 1550 continue; 1551 1552 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1553 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1554 Constructor->getLocation(), CtorArgs)) 1555 continue; 1556 1557 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1558 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1559 ExprTemporaries.clear(); 1560 CXXBaseOrMemberInitializer *Member = 1561 new (Context) CXXBaseOrMemberInitializer(Context, 1562 *Field, SourceLocation(), 1563 Ctor, 1564 SourceLocation(), 1565 CtorArgs.takeAs<Expr>(), 1566 CtorArgs.size(), 1567 SourceLocation()); 1568 1569 AllToInit.push_back(Member); 1570 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1571 } 1572 else if (FT->isReferenceType()) { 1573 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1574 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1575 << 0 << (*Field)->getDeclName(); 1576 Diag((*Field)->getLocation(), diag::note_declared_at); 1577 HadError = true; 1578 } 1579 else if (FT.isConstQualified()) { 1580 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1581 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1582 << 1 << (*Field)->getDeclName(); 1583 Diag((*Field)->getLocation(), diag::note_declared_at); 1584 HadError = true; 1585 } 1586 } 1587 1588 NumInitializers = AllToInit.size(); 1589 if (NumInitializers > 0) { 1590 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1591 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1592 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1593 1594 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1595 for (unsigned Idx = 0; Idx < NumInitializers; ++Idx) 1596 baseOrMemberInitializers[Idx] = AllToInit[Idx]; 1597 } 1598 1599 return HadError; 1600} 1601 1602static void *GetKeyForTopLevelField(FieldDecl *Field) { 1603 // For anonymous unions, use the class declaration as the key. 1604 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1605 if (RT->getDecl()->isAnonymousStructOrUnion()) 1606 return static_cast<void *>(RT->getDecl()); 1607 } 1608 return static_cast<void *>(Field); 1609} 1610 1611static void *GetKeyForBase(QualType BaseType) { 1612 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1613 return (void *)RT; 1614 1615 assert(0 && "Unexpected base type!"); 1616 return 0; 1617} 1618 1619static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1620 bool MemberMaybeAnon = false) { 1621 // For fields injected into the class via declaration of an anonymous union, 1622 // use its anonymous union class declaration as the unique key. 1623 if (Member->isMemberInitializer()) { 1624 FieldDecl *Field = Member->getMember(); 1625 1626 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1627 // data member of the class. Data member used in the initializer list is 1628 // in AnonUnionMember field. 1629 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1630 Field = Member->getAnonUnionMember(); 1631 if (Field->getDeclContext()->isRecord()) { 1632 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 1633 if (RD->isAnonymousStructOrUnion()) 1634 return static_cast<void *>(RD); 1635 } 1636 return static_cast<void *>(Field); 1637 } 1638 1639 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1640} 1641 1642/// ActOnMemInitializers - Handle the member initializers for a constructor. 1643void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1644 SourceLocation ColonLoc, 1645 MemInitTy **MemInits, unsigned NumMemInits) { 1646 if (!ConstructorDecl) 1647 return; 1648 1649 AdjustDeclIfTemplate(ConstructorDecl); 1650 1651 CXXConstructorDecl *Constructor 1652 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1653 1654 if (!Constructor) { 1655 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1656 return; 1657 } 1658 1659 if (!Constructor->isDependentContext()) { 1660 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 1661 bool err = false; 1662 for (unsigned i = 0; i < NumMemInits; i++) { 1663 CXXBaseOrMemberInitializer *Member = 1664 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1665 void *KeyToMember = GetKeyForMember(Member); 1666 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1667 if (!PrevMember) { 1668 PrevMember = Member; 1669 continue; 1670 } 1671 if (FieldDecl *Field = Member->getMember()) 1672 Diag(Member->getSourceLocation(), 1673 diag::error_multiple_mem_initialization) 1674 << Field->getNameAsString() 1675 << Member->getSourceRange(); 1676 else { 1677 Type *BaseClass = Member->getBaseClass(); 1678 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1679 Diag(Member->getSourceLocation(), 1680 diag::error_multiple_base_initialization) 1681 << QualType(BaseClass, 0) 1682 << Member->getSourceRange(); 1683 } 1684 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1685 << 0; 1686 err = true; 1687 } 1688 1689 if (err) 1690 return; 1691 } 1692 1693 SetBaseOrMemberInitializers(Constructor, 1694 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 1695 NumMemInits, false); 1696 1697 if (Constructor->isDependentContext()) 1698 return; 1699 1700 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1701 Diagnostic::Ignored && 1702 Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1703 Diagnostic::Ignored) 1704 return; 1705 1706 // Also issue warning if order of ctor-initializer list does not match order 1707 // of 1) base class declarations and 2) order of non-static data members. 1708 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1709 1710 CXXRecordDecl *ClassDecl 1711 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1712 // Push virtual bases before others. 1713 for (CXXRecordDecl::base_class_iterator VBase = 1714 ClassDecl->vbases_begin(), 1715 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1716 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1717 1718 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1719 E = ClassDecl->bases_end(); Base != E; ++Base) { 1720 // Virtuals are alread in the virtual base list and are constructed 1721 // first. 1722 if (Base->isVirtual()) 1723 continue; 1724 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1725 } 1726 1727 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1728 E = ClassDecl->field_end(); Field != E; ++Field) 1729 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1730 1731 int Last = AllBaseOrMembers.size(); 1732 int curIndex = 0; 1733 CXXBaseOrMemberInitializer *PrevMember = 0; 1734 for (unsigned i = 0; i < NumMemInits; i++) { 1735 CXXBaseOrMemberInitializer *Member = 1736 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1737 void *MemberInCtorList = GetKeyForMember(Member, true); 1738 1739 for (; curIndex < Last; curIndex++) 1740 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1741 break; 1742 if (curIndex == Last) { 1743 assert(PrevMember && "Member not in member list?!"); 1744 // Initializer as specified in ctor-initializer list is out of order. 1745 // Issue a warning diagnostic. 1746 if (PrevMember->isBaseInitializer()) { 1747 // Diagnostics is for an initialized base class. 1748 Type *BaseClass = PrevMember->getBaseClass(); 1749 Diag(PrevMember->getSourceLocation(), 1750 diag::warn_base_initialized) 1751 << QualType(BaseClass, 0); 1752 } else { 1753 FieldDecl *Field = PrevMember->getMember(); 1754 Diag(PrevMember->getSourceLocation(), 1755 diag::warn_field_initialized) 1756 << Field->getNameAsString(); 1757 } 1758 // Also the note! 1759 if (FieldDecl *Field = Member->getMember()) 1760 Diag(Member->getSourceLocation(), 1761 diag::note_fieldorbase_initialized_here) << 0 1762 << Field->getNameAsString(); 1763 else { 1764 Type *BaseClass = Member->getBaseClass(); 1765 Diag(Member->getSourceLocation(), 1766 diag::note_fieldorbase_initialized_here) << 1 1767 << QualType(BaseClass, 0); 1768 } 1769 for (curIndex = 0; curIndex < Last; curIndex++) 1770 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1771 break; 1772 } 1773 PrevMember = Member; 1774 } 1775} 1776 1777void 1778Sema::MarkBaseAndMemberDestructorsReferenced(CXXDestructorDecl *Destructor) { 1779 // Ignore dependent destructors. 1780 if (Destructor->isDependentContext()) 1781 return; 1782 1783 CXXRecordDecl *ClassDecl = Destructor->getParent(); 1784 1785 // Non-static data members. 1786 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1787 E = ClassDecl->field_end(); I != E; ++I) { 1788 FieldDecl *Field = *I; 1789 1790 QualType FieldType = Context.getBaseElementType(Field->getType()); 1791 1792 const RecordType* RT = FieldType->getAs<RecordType>(); 1793 if (!RT) 1794 continue; 1795 1796 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1797 if (FieldClassDecl->hasTrivialDestructor()) 1798 continue; 1799 1800 const CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1801 MarkDeclarationReferenced(Destructor->getLocation(), 1802 const_cast<CXXDestructorDecl*>(Dtor)); 1803 } 1804 1805 // Bases. 1806 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1807 E = ClassDecl->bases_end(); Base != E; ++Base) { 1808 // Ignore virtual bases. 1809 if (Base->isVirtual()) 1810 continue; 1811 1812 // Ignore trivial destructors. 1813 CXXRecordDecl *BaseClassDecl 1814 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1815 if (BaseClassDecl->hasTrivialDestructor()) 1816 continue; 1817 1818 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1819 MarkDeclarationReferenced(Destructor->getLocation(), 1820 const_cast<CXXDestructorDecl*>(Dtor)); 1821 } 1822 1823 // Virtual bases. 1824 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1825 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1826 // Ignore trivial destructors. 1827 CXXRecordDecl *BaseClassDecl 1828 = cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1829 if (BaseClassDecl->hasTrivialDestructor()) 1830 continue; 1831 1832 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1833 MarkDeclarationReferenced(Destructor->getLocation(), 1834 const_cast<CXXDestructorDecl*>(Dtor)); 1835 } 1836} 1837 1838void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1839 if (!CDtorDecl) 1840 return; 1841 1842 AdjustDeclIfTemplate(CDtorDecl); 1843 1844 if (CXXConstructorDecl *Constructor 1845 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1846 SetBaseOrMemberInitializers(Constructor, 0, 0, false); 1847} 1848 1849namespace { 1850 /// PureVirtualMethodCollector - traverses a class and its superclasses 1851 /// and determines if it has any pure virtual methods. 1852 class PureVirtualMethodCollector { 1853 ASTContext &Context; 1854 1855 public: 1856 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1857 1858 private: 1859 MethodList Methods; 1860 1861 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1862 1863 public: 1864 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1865 : Context(Ctx) { 1866 1867 MethodList List; 1868 Collect(RD, List); 1869 1870 // Copy the temporary list to methods, and make sure to ignore any 1871 // null entries. 1872 for (size_t i = 0, e = List.size(); i != e; ++i) { 1873 if (List[i]) 1874 Methods.push_back(List[i]); 1875 } 1876 } 1877 1878 bool empty() const { return Methods.empty(); } 1879 1880 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1881 MethodList::const_iterator methods_end() { return Methods.end(); } 1882 }; 1883 1884 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1885 MethodList& Methods) { 1886 // First, collect the pure virtual methods for the base classes. 1887 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1888 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1889 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1890 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1891 if (BaseDecl && BaseDecl->isAbstract()) 1892 Collect(BaseDecl, Methods); 1893 } 1894 } 1895 1896 // Next, zero out any pure virtual methods that this class overrides. 1897 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1898 1899 MethodSetTy OverriddenMethods; 1900 size_t MethodsSize = Methods.size(); 1901 1902 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1903 i != e; ++i) { 1904 // Traverse the record, looking for methods. 1905 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1906 // If the method is pure virtual, add it to the methods vector. 1907 if (MD->isPure()) 1908 Methods.push_back(MD); 1909 1910 // Record all the overridden methods in our set. 1911 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1912 E = MD->end_overridden_methods(); I != E; ++I) { 1913 // Keep track of the overridden methods. 1914 OverriddenMethods.insert(*I); 1915 } 1916 } 1917 } 1918 1919 // Now go through the methods and zero out all the ones we know are 1920 // overridden. 1921 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1922 if (OverriddenMethods.count(Methods[i])) 1923 Methods[i] = 0; 1924 } 1925 1926 } 1927} 1928 1929 1930bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1931 unsigned DiagID, AbstractDiagSelID SelID, 1932 const CXXRecordDecl *CurrentRD) { 1933 if (SelID == -1) 1934 return RequireNonAbstractType(Loc, T, 1935 PDiag(DiagID), CurrentRD); 1936 else 1937 return RequireNonAbstractType(Loc, T, 1938 PDiag(DiagID) << SelID, CurrentRD); 1939} 1940 1941bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1942 const PartialDiagnostic &PD, 1943 const CXXRecordDecl *CurrentRD) { 1944 if (!getLangOptions().CPlusPlus) 1945 return false; 1946 1947 if (const ArrayType *AT = Context.getAsArrayType(T)) 1948 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 1949 CurrentRD); 1950 1951 if (const PointerType *PT = T->getAs<PointerType>()) { 1952 // Find the innermost pointer type. 1953 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1954 PT = T; 1955 1956 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1957 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 1958 } 1959 1960 const RecordType *RT = T->getAs<RecordType>(); 1961 if (!RT) 1962 return false; 1963 1964 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1965 if (!RD) 1966 return false; 1967 1968 if (CurrentRD && CurrentRD != RD) 1969 return false; 1970 1971 if (!RD->isAbstract()) 1972 return false; 1973 1974 Diag(Loc, PD) << RD->getDeclName(); 1975 1976 // Check if we've already emitted the list of pure virtual functions for this 1977 // class. 1978 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1979 return true; 1980 1981 PureVirtualMethodCollector Collector(Context, RD); 1982 1983 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1984 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1985 const CXXMethodDecl *MD = *I; 1986 1987 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1988 MD->getDeclName(); 1989 } 1990 1991 if (!PureVirtualClassDiagSet) 1992 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1993 PureVirtualClassDiagSet->insert(RD); 1994 1995 return true; 1996} 1997 1998namespace { 1999 class AbstractClassUsageDiagnoser 2000 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2001 Sema &SemaRef; 2002 CXXRecordDecl *AbstractClass; 2003 2004 bool VisitDeclContext(const DeclContext *DC) { 2005 bool Invalid = false; 2006 2007 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2008 E = DC->decls_end(); I != E; ++I) 2009 Invalid |= Visit(*I); 2010 2011 return Invalid; 2012 } 2013 2014 public: 2015 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2016 : SemaRef(SemaRef), AbstractClass(ac) { 2017 Visit(SemaRef.Context.getTranslationUnitDecl()); 2018 } 2019 2020 bool VisitFunctionDecl(const FunctionDecl *FD) { 2021 if (FD->isThisDeclarationADefinition()) { 2022 // No need to do the check if we're in a definition, because it requires 2023 // that the return/param types are complete. 2024 // because that requires 2025 return VisitDeclContext(FD); 2026 } 2027 2028 // Check the return type. 2029 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2030 bool Invalid = 2031 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2032 diag::err_abstract_type_in_decl, 2033 Sema::AbstractReturnType, 2034 AbstractClass); 2035 2036 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2037 E = FD->param_end(); I != E; ++I) { 2038 const ParmVarDecl *VD = *I; 2039 Invalid |= 2040 SemaRef.RequireNonAbstractType(VD->getLocation(), 2041 VD->getOriginalType(), 2042 diag::err_abstract_type_in_decl, 2043 Sema::AbstractParamType, 2044 AbstractClass); 2045 } 2046 2047 return Invalid; 2048 } 2049 2050 bool VisitDecl(const Decl* D) { 2051 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2052 return VisitDeclContext(DC); 2053 2054 return false; 2055 } 2056 }; 2057} 2058 2059/// \brief Perform semantic checks on a class definition that has been 2060/// completing, introducing implicitly-declared members, checking for 2061/// abstract types, etc. 2062void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2063 if (!Record || Record->isInvalidDecl()) 2064 return; 2065 2066 if (!Record->isDependentType()) 2067 AddImplicitlyDeclaredMembersToClass(Record); 2068 2069 if (Record->isInvalidDecl()) 2070 return; 2071 2072 if (!Record->isAbstract()) { 2073 // Collect all the pure virtual methods and see if this is an abstract 2074 // class after all. 2075 PureVirtualMethodCollector Collector(Context, Record); 2076 if (!Collector.empty()) 2077 Record->setAbstract(true); 2078 } 2079 2080 if (Record->isAbstract()) 2081 (void)AbstractClassUsageDiagnoser(*this, Record); 2082} 2083 2084void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2085 DeclPtrTy TagDecl, 2086 SourceLocation LBrac, 2087 SourceLocation RBrac) { 2088 if (!TagDecl) 2089 return; 2090 2091 AdjustDeclIfTemplate(TagDecl); 2092 2093 ActOnFields(S, RLoc, TagDecl, 2094 (DeclPtrTy*)FieldCollector->getCurFields(), 2095 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 2096 2097 CheckCompletedCXXClass( 2098 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2099} 2100 2101/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2102/// special functions, such as the default constructor, copy 2103/// constructor, or destructor, to the given C++ class (C++ 2104/// [special]p1). This routine can only be executed just before the 2105/// definition of the class is complete. 2106void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2107 CanQualType ClassType 2108 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2109 2110 // FIXME: Implicit declarations have exception specifications, which are 2111 // the union of the specifications of the implicitly called functions. 2112 2113 if (!ClassDecl->hasUserDeclaredConstructor()) { 2114 // C++ [class.ctor]p5: 2115 // A default constructor for a class X is a constructor of class X 2116 // that can be called without an argument. If there is no 2117 // user-declared constructor for class X, a default constructor is 2118 // implicitly declared. An implicitly-declared default constructor 2119 // is an inline public member of its class. 2120 DeclarationName Name 2121 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2122 CXXConstructorDecl *DefaultCon = 2123 CXXConstructorDecl::Create(Context, ClassDecl, 2124 ClassDecl->getLocation(), Name, 2125 Context.getFunctionType(Context.VoidTy, 2126 0, 0, false, 0), 2127 /*TInfo=*/0, 2128 /*isExplicit=*/false, 2129 /*isInline=*/true, 2130 /*isImplicitlyDeclared=*/true); 2131 DefaultCon->setAccess(AS_public); 2132 DefaultCon->setImplicit(); 2133 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2134 ClassDecl->addDecl(DefaultCon); 2135 } 2136 2137 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2138 // C++ [class.copy]p4: 2139 // If the class definition does not explicitly declare a copy 2140 // constructor, one is declared implicitly. 2141 2142 // C++ [class.copy]p5: 2143 // The implicitly-declared copy constructor for a class X will 2144 // have the form 2145 // 2146 // X::X(const X&) 2147 // 2148 // if 2149 bool HasConstCopyConstructor = true; 2150 2151 // -- each direct or virtual base class B of X has a copy 2152 // constructor whose first parameter is of type const B& or 2153 // const volatile B&, and 2154 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2155 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2156 const CXXRecordDecl *BaseClassDecl 2157 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2158 HasConstCopyConstructor 2159 = BaseClassDecl->hasConstCopyConstructor(Context); 2160 } 2161 2162 // -- for all the nonstatic data members of X that are of a 2163 // class type M (or array thereof), each such class type 2164 // has a copy constructor whose first parameter is of type 2165 // const M& or const volatile M&. 2166 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2167 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2168 ++Field) { 2169 QualType FieldType = (*Field)->getType(); 2170 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2171 FieldType = Array->getElementType(); 2172 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2173 const CXXRecordDecl *FieldClassDecl 2174 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2175 HasConstCopyConstructor 2176 = FieldClassDecl->hasConstCopyConstructor(Context); 2177 } 2178 } 2179 2180 // Otherwise, the implicitly declared copy constructor will have 2181 // the form 2182 // 2183 // X::X(X&) 2184 QualType ArgType = ClassType; 2185 if (HasConstCopyConstructor) 2186 ArgType = ArgType.withConst(); 2187 ArgType = Context.getLValueReferenceType(ArgType); 2188 2189 // An implicitly-declared copy constructor is an inline public 2190 // member of its class. 2191 DeclarationName Name 2192 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2193 CXXConstructorDecl *CopyConstructor 2194 = CXXConstructorDecl::Create(Context, ClassDecl, 2195 ClassDecl->getLocation(), Name, 2196 Context.getFunctionType(Context.VoidTy, 2197 &ArgType, 1, 2198 false, 0), 2199 /*TInfo=*/0, 2200 /*isExplicit=*/false, 2201 /*isInline=*/true, 2202 /*isImplicitlyDeclared=*/true); 2203 CopyConstructor->setAccess(AS_public); 2204 CopyConstructor->setImplicit(); 2205 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2206 2207 // Add the parameter to the constructor. 2208 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2209 ClassDecl->getLocation(), 2210 /*IdentifierInfo=*/0, 2211 ArgType, /*TInfo=*/0, 2212 VarDecl::None, 0); 2213 CopyConstructor->setParams(Context, &FromParam, 1); 2214 ClassDecl->addDecl(CopyConstructor); 2215 } 2216 2217 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2218 // Note: The following rules are largely analoguous to the copy 2219 // constructor rules. Note that virtual bases are not taken into account 2220 // for determining the argument type of the operator. Note also that 2221 // operators taking an object instead of a reference are allowed. 2222 // 2223 // C++ [class.copy]p10: 2224 // If the class definition does not explicitly declare a copy 2225 // assignment operator, one is declared implicitly. 2226 // The implicitly-defined copy assignment operator for a class X 2227 // will have the form 2228 // 2229 // X& X::operator=(const X&) 2230 // 2231 // if 2232 bool HasConstCopyAssignment = true; 2233 2234 // -- each direct base class B of X has a copy assignment operator 2235 // whose parameter is of type const B&, const volatile B& or B, 2236 // and 2237 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2238 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2239 assert(!Base->getType()->isDependentType() && 2240 "Cannot generate implicit members for class with dependent bases."); 2241 const CXXRecordDecl *BaseClassDecl 2242 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2243 const CXXMethodDecl *MD = 0; 2244 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2245 MD); 2246 } 2247 2248 // -- for all the nonstatic data members of X that are of a class 2249 // type M (or array thereof), each such class type has a copy 2250 // assignment operator whose parameter is of type const M&, 2251 // const volatile M& or M. 2252 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2253 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2254 ++Field) { 2255 QualType FieldType = (*Field)->getType(); 2256 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2257 FieldType = Array->getElementType(); 2258 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2259 const CXXRecordDecl *FieldClassDecl 2260 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2261 const CXXMethodDecl *MD = 0; 2262 HasConstCopyAssignment 2263 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2264 } 2265 } 2266 2267 // Otherwise, the implicitly declared copy assignment operator will 2268 // have the form 2269 // 2270 // X& X::operator=(X&) 2271 QualType ArgType = ClassType; 2272 QualType RetType = Context.getLValueReferenceType(ArgType); 2273 if (HasConstCopyAssignment) 2274 ArgType = ArgType.withConst(); 2275 ArgType = Context.getLValueReferenceType(ArgType); 2276 2277 // An implicitly-declared copy assignment operator is an inline public 2278 // member of its class. 2279 DeclarationName Name = 2280 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2281 CXXMethodDecl *CopyAssignment = 2282 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2283 Context.getFunctionType(RetType, &ArgType, 1, 2284 false, 0), 2285 /*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2286 CopyAssignment->setAccess(AS_public); 2287 CopyAssignment->setImplicit(); 2288 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2289 CopyAssignment->setCopyAssignment(true); 2290 2291 // Add the parameter to the operator. 2292 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2293 ClassDecl->getLocation(), 2294 /*IdentifierInfo=*/0, 2295 ArgType, /*TInfo=*/0, 2296 VarDecl::None, 0); 2297 CopyAssignment->setParams(Context, &FromParam, 1); 2298 2299 // Don't call addedAssignmentOperator. There is no way to distinguish an 2300 // implicit from an explicit assignment operator. 2301 ClassDecl->addDecl(CopyAssignment); 2302 AddOverriddenMethods(ClassDecl, CopyAssignment); 2303 } 2304 2305 if (!ClassDecl->hasUserDeclaredDestructor()) { 2306 // C++ [class.dtor]p2: 2307 // If a class has no user-declared destructor, a destructor is 2308 // declared implicitly. An implicitly-declared destructor is an 2309 // inline public member of its class. 2310 DeclarationName Name 2311 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2312 CXXDestructorDecl *Destructor 2313 = CXXDestructorDecl::Create(Context, ClassDecl, 2314 ClassDecl->getLocation(), Name, 2315 Context.getFunctionType(Context.VoidTy, 2316 0, 0, false, 0), 2317 /*isInline=*/true, 2318 /*isImplicitlyDeclared=*/true); 2319 Destructor->setAccess(AS_public); 2320 Destructor->setImplicit(); 2321 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2322 ClassDecl->addDecl(Destructor); 2323 2324 AddOverriddenMethods(ClassDecl, Destructor); 2325 } 2326} 2327 2328void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2329 Decl *D = TemplateD.getAs<Decl>(); 2330 if (!D) 2331 return; 2332 2333 TemplateParameterList *Params = 0; 2334 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2335 Params = Template->getTemplateParameters(); 2336 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2337 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2338 Params = PartialSpec->getTemplateParameters(); 2339 else 2340 return; 2341 2342 for (TemplateParameterList::iterator Param = Params->begin(), 2343 ParamEnd = Params->end(); 2344 Param != ParamEnd; ++Param) { 2345 NamedDecl *Named = cast<NamedDecl>(*Param); 2346 if (Named->getDeclName()) { 2347 S->AddDecl(DeclPtrTy::make(Named)); 2348 IdResolver.AddDecl(Named); 2349 } 2350 } 2351} 2352 2353void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2354 if (!RecordD) return; 2355 AdjustDeclIfTemplate(RecordD); 2356 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2357 PushDeclContext(S, Record); 2358} 2359 2360void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2361 if (!RecordD) return; 2362 PopDeclContext(); 2363} 2364 2365/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2366/// parsing a top-level (non-nested) C++ class, and we are now 2367/// parsing those parts of the given Method declaration that could 2368/// not be parsed earlier (C++ [class.mem]p2), such as default 2369/// arguments. This action should enter the scope of the given 2370/// Method declaration as if we had just parsed the qualified method 2371/// name. However, it should not bring the parameters into scope; 2372/// that will be performed by ActOnDelayedCXXMethodParameter. 2373void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2374} 2375 2376/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2377/// C++ method declaration. We're (re-)introducing the given 2378/// function parameter into scope for use in parsing later parts of 2379/// the method declaration. For example, we could see an 2380/// ActOnParamDefaultArgument event for this parameter. 2381void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2382 if (!ParamD) 2383 return; 2384 2385 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2386 2387 // If this parameter has an unparsed default argument, clear it out 2388 // to make way for the parsed default argument. 2389 if (Param->hasUnparsedDefaultArg()) 2390 Param->setDefaultArg(0); 2391 2392 S->AddDecl(DeclPtrTy::make(Param)); 2393 if (Param->getDeclName()) 2394 IdResolver.AddDecl(Param); 2395} 2396 2397/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2398/// processing the delayed method declaration for Method. The method 2399/// declaration is now considered finished. There may be a separate 2400/// ActOnStartOfFunctionDef action later (not necessarily 2401/// immediately!) for this method, if it was also defined inside the 2402/// class body. 2403void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2404 if (!MethodD) 2405 return; 2406 2407 AdjustDeclIfTemplate(MethodD); 2408 2409 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2410 2411 // Now that we have our default arguments, check the constructor 2412 // again. It could produce additional diagnostics or affect whether 2413 // the class has implicitly-declared destructors, among other 2414 // things. 2415 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2416 CheckConstructor(Constructor); 2417 2418 // Check the default arguments, which we may have added. 2419 if (!Method->isInvalidDecl()) 2420 CheckCXXDefaultArguments(Method); 2421} 2422 2423/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2424/// the well-formedness of the constructor declarator @p D with type @p 2425/// R. If there are any errors in the declarator, this routine will 2426/// emit diagnostics and set the invalid bit to true. In any case, the type 2427/// will be updated to reflect a well-formed type for the constructor and 2428/// returned. 2429QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2430 FunctionDecl::StorageClass &SC) { 2431 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2432 2433 // C++ [class.ctor]p3: 2434 // A constructor shall not be virtual (10.3) or static (9.4). A 2435 // constructor can be invoked for a const, volatile or const 2436 // volatile object. A constructor shall not be declared const, 2437 // volatile, or const volatile (9.3.2). 2438 if (isVirtual) { 2439 if (!D.isInvalidType()) 2440 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2441 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2442 << SourceRange(D.getIdentifierLoc()); 2443 D.setInvalidType(); 2444 } 2445 if (SC == FunctionDecl::Static) { 2446 if (!D.isInvalidType()) 2447 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2448 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2449 << SourceRange(D.getIdentifierLoc()); 2450 D.setInvalidType(); 2451 SC = FunctionDecl::None; 2452 } 2453 2454 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2455 if (FTI.TypeQuals != 0) { 2456 if (FTI.TypeQuals & Qualifiers::Const) 2457 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2458 << "const" << SourceRange(D.getIdentifierLoc()); 2459 if (FTI.TypeQuals & Qualifiers::Volatile) 2460 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2461 << "volatile" << SourceRange(D.getIdentifierLoc()); 2462 if (FTI.TypeQuals & Qualifiers::Restrict) 2463 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2464 << "restrict" << SourceRange(D.getIdentifierLoc()); 2465 } 2466 2467 // Rebuild the function type "R" without any type qualifiers (in 2468 // case any of the errors above fired) and with "void" as the 2469 // return type, since constructors don't have return types. We 2470 // *always* have to do this, because GetTypeForDeclarator will 2471 // put in a result type of "int" when none was specified. 2472 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2473 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2474 Proto->getNumArgs(), 2475 Proto->isVariadic(), 0); 2476} 2477 2478/// CheckConstructor - Checks a fully-formed constructor for 2479/// well-formedness, issuing any diagnostics required. Returns true if 2480/// the constructor declarator is invalid. 2481void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2482 CXXRecordDecl *ClassDecl 2483 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2484 if (!ClassDecl) 2485 return Constructor->setInvalidDecl(); 2486 2487 // C++ [class.copy]p3: 2488 // A declaration of a constructor for a class X is ill-formed if 2489 // its first parameter is of type (optionally cv-qualified) X and 2490 // either there are no other parameters or else all other 2491 // parameters have default arguments. 2492 if (!Constructor->isInvalidDecl() && 2493 ((Constructor->getNumParams() == 1) || 2494 (Constructor->getNumParams() > 1 && 2495 Constructor->getParamDecl(1)->hasDefaultArg())) && 2496 Constructor->getTemplateSpecializationKind() 2497 != TSK_ImplicitInstantiation) { 2498 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2499 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2500 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2501 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2502 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2503 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 2504 2505 // FIXME: Rather that making the constructor invalid, we should endeavor 2506 // to fix the type. 2507 Constructor->setInvalidDecl(); 2508 } 2509 } 2510 2511 // Notify the class that we've added a constructor. 2512 ClassDecl->addedConstructor(Context, Constructor); 2513} 2514 2515/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2516/// issuing any diagnostics required. Returns true on error. 2517bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2518 CXXRecordDecl *RD = Destructor->getParent(); 2519 2520 if (Destructor->isVirtual()) { 2521 SourceLocation Loc; 2522 2523 if (!Destructor->isImplicit()) 2524 Loc = Destructor->getLocation(); 2525 else 2526 Loc = RD->getLocation(); 2527 2528 // If we have a virtual destructor, look up the deallocation function 2529 FunctionDecl *OperatorDelete = 0; 2530 DeclarationName Name = 2531 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2532 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2533 return true; 2534 2535 Destructor->setOperatorDelete(OperatorDelete); 2536 } 2537 2538 return false; 2539} 2540 2541static inline bool 2542FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2543 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2544 FTI.ArgInfo[0].Param && 2545 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2546} 2547 2548/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2549/// the well-formednes of the destructor declarator @p D with type @p 2550/// R. If there are any errors in the declarator, this routine will 2551/// emit diagnostics and set the declarator to invalid. Even if this happens, 2552/// will be updated to reflect a well-formed type for the destructor and 2553/// returned. 2554QualType Sema::CheckDestructorDeclarator(Declarator &D, 2555 FunctionDecl::StorageClass& SC) { 2556 // C++ [class.dtor]p1: 2557 // [...] A typedef-name that names a class is a class-name 2558 // (7.1.3); however, a typedef-name that names a class shall not 2559 // be used as the identifier in the declarator for a destructor 2560 // declaration. 2561 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2562 if (isa<TypedefType>(DeclaratorType)) { 2563 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2564 << DeclaratorType; 2565 D.setInvalidType(); 2566 } 2567 2568 // C++ [class.dtor]p2: 2569 // A destructor is used to destroy objects of its class type. A 2570 // destructor takes no parameters, and no return type can be 2571 // specified for it (not even void). The address of a destructor 2572 // shall not be taken. A destructor shall not be static. A 2573 // destructor can be invoked for a const, volatile or const 2574 // volatile object. A destructor shall not be declared const, 2575 // volatile or const volatile (9.3.2). 2576 if (SC == FunctionDecl::Static) { 2577 if (!D.isInvalidType()) 2578 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2579 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2580 << SourceRange(D.getIdentifierLoc()); 2581 SC = FunctionDecl::None; 2582 D.setInvalidType(); 2583 } 2584 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2585 // Destructors don't have return types, but the parser will 2586 // happily parse something like: 2587 // 2588 // class X { 2589 // float ~X(); 2590 // }; 2591 // 2592 // The return type will be eliminated later. 2593 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2594 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2595 << SourceRange(D.getIdentifierLoc()); 2596 } 2597 2598 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2599 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2600 if (FTI.TypeQuals & Qualifiers::Const) 2601 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2602 << "const" << SourceRange(D.getIdentifierLoc()); 2603 if (FTI.TypeQuals & Qualifiers::Volatile) 2604 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2605 << "volatile" << SourceRange(D.getIdentifierLoc()); 2606 if (FTI.TypeQuals & Qualifiers::Restrict) 2607 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2608 << "restrict" << SourceRange(D.getIdentifierLoc()); 2609 D.setInvalidType(); 2610 } 2611 2612 // Make sure we don't have any parameters. 2613 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2614 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2615 2616 // Delete the parameters. 2617 FTI.freeArgs(); 2618 D.setInvalidType(); 2619 } 2620 2621 // Make sure the destructor isn't variadic. 2622 if (FTI.isVariadic) { 2623 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2624 D.setInvalidType(); 2625 } 2626 2627 // Rebuild the function type "R" without any type qualifiers or 2628 // parameters (in case any of the errors above fired) and with 2629 // "void" as the return type, since destructors don't have return 2630 // types. We *always* have to do this, because GetTypeForDeclarator 2631 // will put in a result type of "int" when none was specified. 2632 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 2633} 2634 2635/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2636/// well-formednes of the conversion function declarator @p D with 2637/// type @p R. If there are any errors in the declarator, this routine 2638/// will emit diagnostics and return true. Otherwise, it will return 2639/// false. Either way, the type @p R will be updated to reflect a 2640/// well-formed type for the conversion operator. 2641void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2642 FunctionDecl::StorageClass& SC) { 2643 // C++ [class.conv.fct]p1: 2644 // Neither parameter types nor return type can be specified. The 2645 // type of a conversion function (8.3.5) is "function taking no 2646 // parameter returning conversion-type-id." 2647 if (SC == FunctionDecl::Static) { 2648 if (!D.isInvalidType()) 2649 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2650 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2651 << SourceRange(D.getIdentifierLoc()); 2652 D.setInvalidType(); 2653 SC = FunctionDecl::None; 2654 } 2655 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2656 // Conversion functions don't have return types, but the parser will 2657 // happily parse something like: 2658 // 2659 // class X { 2660 // float operator bool(); 2661 // }; 2662 // 2663 // The return type will be changed later anyway. 2664 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2665 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2666 << SourceRange(D.getIdentifierLoc()); 2667 } 2668 2669 // Make sure we don't have any parameters. 2670 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2671 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2672 2673 // Delete the parameters. 2674 D.getTypeObject(0).Fun.freeArgs(); 2675 D.setInvalidType(); 2676 } 2677 2678 // Make sure the conversion function isn't variadic. 2679 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2680 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2681 D.setInvalidType(); 2682 } 2683 2684 // C++ [class.conv.fct]p4: 2685 // The conversion-type-id shall not represent a function type nor 2686 // an array type. 2687 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2688 if (ConvType->isArrayType()) { 2689 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2690 ConvType = Context.getPointerType(ConvType); 2691 D.setInvalidType(); 2692 } else if (ConvType->isFunctionType()) { 2693 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2694 ConvType = Context.getPointerType(ConvType); 2695 D.setInvalidType(); 2696 } 2697 2698 // Rebuild the function type "R" without any parameters (in case any 2699 // of the errors above fired) and with the conversion type as the 2700 // return type. 2701 R = Context.getFunctionType(ConvType, 0, 0, false, 2702 R->getAs<FunctionProtoType>()->getTypeQuals()); 2703 2704 // C++0x explicit conversion operators. 2705 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2706 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2707 diag::warn_explicit_conversion_functions) 2708 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2709} 2710 2711/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2712/// the declaration of the given C++ conversion function. This routine 2713/// is responsible for recording the conversion function in the C++ 2714/// class, if possible. 2715Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2716 assert(Conversion && "Expected to receive a conversion function declaration"); 2717 2718 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2719 2720 // Make sure we aren't redeclaring the conversion function. 2721 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2722 2723 // C++ [class.conv.fct]p1: 2724 // [...] A conversion function is never used to convert a 2725 // (possibly cv-qualified) object to the (possibly cv-qualified) 2726 // same object type (or a reference to it), to a (possibly 2727 // cv-qualified) base class of that type (or a reference to it), 2728 // or to (possibly cv-qualified) void. 2729 // FIXME: Suppress this warning if the conversion function ends up being a 2730 // virtual function that overrides a virtual function in a base class. 2731 QualType ClassType 2732 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2733 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2734 ConvType = ConvTypeRef->getPointeeType(); 2735 if (ConvType->isRecordType()) { 2736 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2737 if (ConvType == ClassType) 2738 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2739 << ClassType; 2740 else if (IsDerivedFrom(ClassType, ConvType)) 2741 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2742 << ClassType << ConvType; 2743 } else if (ConvType->isVoidType()) { 2744 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2745 << ClassType << ConvType; 2746 } 2747 2748 if (Conversion->getPrimaryTemplate()) { 2749 // ignore specializations 2750 } else if (Conversion->getPreviousDeclaration()) { 2751 if (FunctionTemplateDecl *ConversionTemplate 2752 = Conversion->getDescribedFunctionTemplate()) { 2753 if (ClassDecl->replaceConversion( 2754 ConversionTemplate->getPreviousDeclaration(), 2755 ConversionTemplate)) 2756 return DeclPtrTy::make(ConversionTemplate); 2757 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 2758 Conversion)) 2759 return DeclPtrTy::make(Conversion); 2760 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2761 } else if (FunctionTemplateDecl *ConversionTemplate 2762 = Conversion->getDescribedFunctionTemplate()) 2763 ClassDecl->addConversionFunction(ConversionTemplate); 2764 else 2765 ClassDecl->addConversionFunction(Conversion); 2766 2767 return DeclPtrTy::make(Conversion); 2768} 2769 2770//===----------------------------------------------------------------------===// 2771// Namespace Handling 2772//===----------------------------------------------------------------------===// 2773 2774/// ActOnStartNamespaceDef - This is called at the start of a namespace 2775/// definition. 2776Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2777 SourceLocation IdentLoc, 2778 IdentifierInfo *II, 2779 SourceLocation LBrace) { 2780 NamespaceDecl *Namespc = 2781 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2782 Namespc->setLBracLoc(LBrace); 2783 2784 Scope *DeclRegionScope = NamespcScope->getParent(); 2785 2786 if (II) { 2787 // C++ [namespace.def]p2: 2788 // The identifier in an original-namespace-definition shall not have been 2789 // previously defined in the declarative region in which the 2790 // original-namespace-definition appears. The identifier in an 2791 // original-namespace-definition is the name of the namespace. Subsequently 2792 // in that declarative region, it is treated as an original-namespace-name. 2793 2794 NamedDecl *PrevDecl 2795 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2796 ForRedeclaration); 2797 2798 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2799 // This is an extended namespace definition. 2800 // Attach this namespace decl to the chain of extended namespace 2801 // definitions. 2802 OrigNS->setNextNamespace(Namespc); 2803 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2804 2805 // Remove the previous declaration from the scope. 2806 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2807 IdResolver.RemoveDecl(OrigNS); 2808 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2809 } 2810 } else if (PrevDecl) { 2811 // This is an invalid name redefinition. 2812 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2813 << Namespc->getDeclName(); 2814 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2815 Namespc->setInvalidDecl(); 2816 // Continue on to push Namespc as current DeclContext and return it. 2817 } else if (II->isStr("std") && 2818 CurContext->getLookupContext()->isTranslationUnit()) { 2819 // This is the first "real" definition of the namespace "std", so update 2820 // our cache of the "std" namespace to point at this definition. 2821 if (StdNamespace) { 2822 // We had already defined a dummy namespace "std". Link this new 2823 // namespace definition to the dummy namespace "std". 2824 StdNamespace->setNextNamespace(Namespc); 2825 StdNamespace->setLocation(IdentLoc); 2826 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2827 } 2828 2829 // Make our StdNamespace cache point at the first real definition of the 2830 // "std" namespace. 2831 StdNamespace = Namespc; 2832 } 2833 2834 PushOnScopeChains(Namespc, DeclRegionScope); 2835 } else { 2836 // Anonymous namespaces. 2837 assert(Namespc->isAnonymousNamespace()); 2838 CurContext->addDecl(Namespc); 2839 2840 // Link the anonymous namespace into its parent. 2841 NamespaceDecl *PrevDecl; 2842 DeclContext *Parent = CurContext->getLookupContext(); 2843 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 2844 PrevDecl = TU->getAnonymousNamespace(); 2845 TU->setAnonymousNamespace(Namespc); 2846 } else { 2847 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 2848 PrevDecl = ND->getAnonymousNamespace(); 2849 ND->setAnonymousNamespace(Namespc); 2850 } 2851 2852 // Link the anonymous namespace with its previous declaration. 2853 if (PrevDecl) { 2854 assert(PrevDecl->isAnonymousNamespace()); 2855 assert(!PrevDecl->getNextNamespace()); 2856 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 2857 PrevDecl->setNextNamespace(Namespc); 2858 } 2859 2860 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2861 // behaves as if it were replaced by 2862 // namespace unique { /* empty body */ } 2863 // using namespace unique; 2864 // namespace unique { namespace-body } 2865 // where all occurrences of 'unique' in a translation unit are 2866 // replaced by the same identifier and this identifier differs 2867 // from all other identifiers in the entire program. 2868 2869 // We just create the namespace with an empty name and then add an 2870 // implicit using declaration, just like the standard suggests. 2871 // 2872 // CodeGen enforces the "universally unique" aspect by giving all 2873 // declarations semantically contained within an anonymous 2874 // namespace internal linkage. 2875 2876 if (!PrevDecl) { 2877 UsingDirectiveDecl* UD 2878 = UsingDirectiveDecl::Create(Context, CurContext, 2879 /* 'using' */ LBrace, 2880 /* 'namespace' */ SourceLocation(), 2881 /* qualifier */ SourceRange(), 2882 /* NNS */ NULL, 2883 /* identifier */ SourceLocation(), 2884 Namespc, 2885 /* Ancestor */ CurContext); 2886 UD->setImplicit(); 2887 CurContext->addDecl(UD); 2888 } 2889 } 2890 2891 // Although we could have an invalid decl (i.e. the namespace name is a 2892 // redefinition), push it as current DeclContext and try to continue parsing. 2893 // FIXME: We should be able to push Namespc here, so that the each DeclContext 2894 // for the namespace has the declarations that showed up in that particular 2895 // namespace definition. 2896 PushDeclContext(NamespcScope, Namespc); 2897 return DeclPtrTy::make(Namespc); 2898} 2899 2900/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2901/// is a namespace alias, returns the namespace it points to. 2902static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2903 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2904 return AD->getNamespace(); 2905 return dyn_cast_or_null<NamespaceDecl>(D); 2906} 2907 2908/// ActOnFinishNamespaceDef - This callback is called after a namespace is 2909/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 2910void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 2911 Decl *Dcl = D.getAs<Decl>(); 2912 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 2913 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 2914 Namespc->setRBracLoc(RBrace); 2915 PopDeclContext(); 2916} 2917 2918Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 2919 SourceLocation UsingLoc, 2920 SourceLocation NamespcLoc, 2921 const CXXScopeSpec &SS, 2922 SourceLocation IdentLoc, 2923 IdentifierInfo *NamespcName, 2924 AttributeList *AttrList) { 2925 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2926 assert(NamespcName && "Invalid NamespcName."); 2927 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 2928 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2929 2930 UsingDirectiveDecl *UDir = 0; 2931 2932 // Lookup namespace name. 2933 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 2934 LookupParsedName(R, S, &SS); 2935 if (R.isAmbiguous()) 2936 return DeclPtrTy(); 2937 2938 if (!R.empty()) { 2939 NamedDecl *Named = R.getFoundDecl(); 2940 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 2941 && "expected namespace decl"); 2942 // C++ [namespace.udir]p1: 2943 // A using-directive specifies that the names in the nominated 2944 // namespace can be used in the scope in which the 2945 // using-directive appears after the using-directive. During 2946 // unqualified name lookup (3.4.1), the names appear as if they 2947 // were declared in the nearest enclosing namespace which 2948 // contains both the using-directive and the nominated 2949 // namespace. [Note: in this context, "contains" means "contains 2950 // directly or indirectly". ] 2951 2952 // Find enclosing context containing both using-directive and 2953 // nominated namespace. 2954 NamespaceDecl *NS = getNamespaceDecl(Named); 2955 DeclContext *CommonAncestor = cast<DeclContext>(NS); 2956 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 2957 CommonAncestor = CommonAncestor->getParent(); 2958 2959 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 2960 SS.getRange(), 2961 (NestedNameSpecifier *)SS.getScopeRep(), 2962 IdentLoc, Named, CommonAncestor); 2963 PushUsingDirective(S, UDir); 2964 } else { 2965 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 2966 } 2967 2968 // FIXME: We ignore attributes for now. 2969 delete AttrList; 2970 return DeclPtrTy::make(UDir); 2971} 2972 2973void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2974 // If scope has associated entity, then using directive is at namespace 2975 // or translation unit scope. We add UsingDirectiveDecls, into 2976 // it's lookup structure. 2977 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2978 Ctx->addDecl(UDir); 2979 else 2980 // Otherwise it is block-sope. using-directives will affect lookup 2981 // only to the end of scope. 2982 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2983} 2984 2985 2986Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2987 AccessSpecifier AS, 2988 bool HasUsingKeyword, 2989 SourceLocation UsingLoc, 2990 const CXXScopeSpec &SS, 2991 UnqualifiedId &Name, 2992 AttributeList *AttrList, 2993 bool IsTypeName, 2994 SourceLocation TypenameLoc) { 2995 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2996 2997 switch (Name.getKind()) { 2998 case UnqualifiedId::IK_Identifier: 2999 case UnqualifiedId::IK_OperatorFunctionId: 3000 case UnqualifiedId::IK_LiteralOperatorId: 3001 case UnqualifiedId::IK_ConversionFunctionId: 3002 break; 3003 3004 case UnqualifiedId::IK_ConstructorName: 3005 // C++0x inherited constructors. 3006 if (getLangOptions().CPlusPlus0x) break; 3007 3008 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3009 << SS.getRange(); 3010 return DeclPtrTy(); 3011 3012 case UnqualifiedId::IK_DestructorName: 3013 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3014 << SS.getRange(); 3015 return DeclPtrTy(); 3016 3017 case UnqualifiedId::IK_TemplateId: 3018 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3019 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3020 return DeclPtrTy(); 3021 } 3022 3023 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3024 if (!TargetName) 3025 return DeclPtrTy(); 3026 3027 // Warn about using declarations. 3028 // TODO: store that the declaration was written without 'using' and 3029 // talk about access decls instead of using decls in the 3030 // diagnostics. 3031 if (!HasUsingKeyword) { 3032 UsingLoc = Name.getSourceRange().getBegin(); 3033 3034 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3035 << CodeModificationHint::CreateInsertion(SS.getRange().getBegin(), 3036 "using "); 3037 } 3038 3039 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3040 Name.getSourceRange().getBegin(), 3041 TargetName, AttrList, 3042 /* IsInstantiation */ false, 3043 IsTypeName, TypenameLoc); 3044 if (UD) 3045 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3046 3047 return DeclPtrTy::make(UD); 3048} 3049 3050/// Determines whether to create a using shadow decl for a particular 3051/// decl, given the set of decls existing prior to this using lookup. 3052bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3053 const LookupResult &Previous) { 3054 // Diagnose finding a decl which is not from a base class of the 3055 // current class. We do this now because there are cases where this 3056 // function will silently decide not to build a shadow decl, which 3057 // will pre-empt further diagnostics. 3058 // 3059 // We don't need to do this in C++0x because we do the check once on 3060 // the qualifier. 3061 // 3062 // FIXME: diagnose the following if we care enough: 3063 // struct A { int foo; }; 3064 // struct B : A { using A::foo; }; 3065 // template <class T> struct C : A {}; 3066 // template <class T> struct D : C<T> { using B::foo; } // <--- 3067 // This is invalid (during instantiation) in C++03 because B::foo 3068 // resolves to the using decl in B, which is not a base class of D<T>. 3069 // We can't diagnose it immediately because C<T> is an unknown 3070 // specialization. The UsingShadowDecl in D<T> then points directly 3071 // to A::foo, which will look well-formed when we instantiate. 3072 // The right solution is to not collapse the shadow-decl chain. 3073 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3074 DeclContext *OrigDC = Orig->getDeclContext(); 3075 3076 // Handle enums and anonymous structs. 3077 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3078 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3079 while (OrigRec->isAnonymousStructOrUnion()) 3080 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3081 3082 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3083 if (OrigDC == CurContext) { 3084 Diag(Using->getLocation(), 3085 diag::err_using_decl_nested_name_specifier_is_current_class) 3086 << Using->getNestedNameRange(); 3087 Diag(Orig->getLocation(), diag::note_using_decl_target); 3088 return true; 3089 } 3090 3091 Diag(Using->getNestedNameRange().getBegin(), 3092 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3093 << Using->getTargetNestedNameDecl() 3094 << cast<CXXRecordDecl>(CurContext) 3095 << Using->getNestedNameRange(); 3096 Diag(Orig->getLocation(), diag::note_using_decl_target); 3097 return true; 3098 } 3099 } 3100 3101 if (Previous.empty()) return false; 3102 3103 NamedDecl *Target = Orig; 3104 if (isa<UsingShadowDecl>(Target)) 3105 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3106 3107 // If the target happens to be one of the previous declarations, we 3108 // don't have a conflict. 3109 // 3110 // FIXME: but we might be increasing its access, in which case we 3111 // should redeclare it. 3112 NamedDecl *NonTag = 0, *Tag = 0; 3113 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3114 I != E; ++I) { 3115 NamedDecl *D = (*I)->getUnderlyingDecl(); 3116 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3117 return false; 3118 3119 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3120 } 3121 3122 if (Target->isFunctionOrFunctionTemplate()) { 3123 FunctionDecl *FD; 3124 if (isa<FunctionTemplateDecl>(Target)) 3125 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3126 else 3127 FD = cast<FunctionDecl>(Target); 3128 3129 NamedDecl *OldDecl = 0; 3130 switch (CheckOverload(FD, Previous, OldDecl)) { 3131 case Ovl_Overload: 3132 return false; 3133 3134 case Ovl_NonFunction: 3135 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3136 break; 3137 3138 // We found a decl with the exact signature. 3139 case Ovl_Match: 3140 if (isa<UsingShadowDecl>(OldDecl)) { 3141 // Silently ignore the possible conflict. 3142 return false; 3143 } 3144 3145 // If we're in a record, we want to hide the target, so we 3146 // return true (without a diagnostic) to tell the caller not to 3147 // build a shadow decl. 3148 if (CurContext->isRecord()) 3149 return true; 3150 3151 // If we're not in a record, this is an error. 3152 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3153 break; 3154 } 3155 3156 Diag(Target->getLocation(), diag::note_using_decl_target); 3157 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3158 return true; 3159 } 3160 3161 // Target is not a function. 3162 3163 if (isa<TagDecl>(Target)) { 3164 // No conflict between a tag and a non-tag. 3165 if (!Tag) return false; 3166 3167 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3168 Diag(Target->getLocation(), diag::note_using_decl_target); 3169 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3170 return true; 3171 } 3172 3173 // No conflict between a tag and a non-tag. 3174 if (!NonTag) return false; 3175 3176 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3177 Diag(Target->getLocation(), diag::note_using_decl_target); 3178 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3179 return true; 3180} 3181 3182/// Builds a shadow declaration corresponding to a 'using' declaration. 3183UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3184 UsingDecl *UD, 3185 NamedDecl *Orig) { 3186 3187 // If we resolved to another shadow declaration, just coalesce them. 3188 NamedDecl *Target = Orig; 3189 if (isa<UsingShadowDecl>(Target)) { 3190 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3191 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3192 } 3193 3194 UsingShadowDecl *Shadow 3195 = UsingShadowDecl::Create(Context, CurContext, 3196 UD->getLocation(), UD, Target); 3197 UD->addShadowDecl(Shadow); 3198 3199 if (S) 3200 PushOnScopeChains(Shadow, S); 3201 else 3202 CurContext->addDecl(Shadow); 3203 Shadow->setAccess(UD->getAccess()); 3204 3205 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3206 Shadow->setInvalidDecl(); 3207 3208 return Shadow; 3209} 3210 3211/// Hides a using shadow declaration. This is required by the current 3212/// using-decl implementation when a resolvable using declaration in a 3213/// class is followed by a declaration which would hide or override 3214/// one or more of the using decl's targets; for example: 3215/// 3216/// struct Base { void foo(int); }; 3217/// struct Derived : Base { 3218/// using Base::foo; 3219/// void foo(int); 3220/// }; 3221/// 3222/// The governing language is C++03 [namespace.udecl]p12: 3223/// 3224/// When a using-declaration brings names from a base class into a 3225/// derived class scope, member functions in the derived class 3226/// override and/or hide member functions with the same name and 3227/// parameter types in a base class (rather than conflicting). 3228/// 3229/// There are two ways to implement this: 3230/// (1) optimistically create shadow decls when they're not hidden 3231/// by existing declarations, or 3232/// (2) don't create any shadow decls (or at least don't make them 3233/// visible) until we've fully parsed/instantiated the class. 3234/// The problem with (1) is that we might have to retroactively remove 3235/// a shadow decl, which requires several O(n) operations because the 3236/// decl structures are (very reasonably) not designed for removal. 3237/// (2) avoids this but is very fiddly and phase-dependent. 3238void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3239 // Remove it from the DeclContext... 3240 Shadow->getDeclContext()->removeDecl(Shadow); 3241 3242 // ...and the scope, if applicable... 3243 if (S) { 3244 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3245 IdResolver.RemoveDecl(Shadow); 3246 } 3247 3248 // ...and the using decl. 3249 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3250 3251 // TODO: complain somehow if Shadow was used. It shouldn't 3252 // be possible for this to happen, because 3253} 3254 3255/// Builds a using declaration. 3256/// 3257/// \param IsInstantiation - Whether this call arises from an 3258/// instantiation of an unresolved using declaration. We treat 3259/// the lookup differently for these declarations. 3260NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3261 SourceLocation UsingLoc, 3262 const CXXScopeSpec &SS, 3263 SourceLocation IdentLoc, 3264 DeclarationName Name, 3265 AttributeList *AttrList, 3266 bool IsInstantiation, 3267 bool IsTypeName, 3268 SourceLocation TypenameLoc) { 3269 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3270 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3271 3272 // FIXME: We ignore attributes for now. 3273 delete AttrList; 3274 3275 if (SS.isEmpty()) { 3276 Diag(IdentLoc, diag::err_using_requires_qualname); 3277 return 0; 3278 } 3279 3280 // Do the redeclaration lookup in the current scope. 3281 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3282 ForRedeclaration); 3283 Previous.setHideTags(false); 3284 if (S) { 3285 LookupName(Previous, S); 3286 3287 // It is really dumb that we have to do this. 3288 LookupResult::Filter F = Previous.makeFilter(); 3289 while (F.hasNext()) { 3290 NamedDecl *D = F.next(); 3291 if (!isDeclInScope(D, CurContext, S)) 3292 F.erase(); 3293 } 3294 F.done(); 3295 } else { 3296 assert(IsInstantiation && "no scope in non-instantiation"); 3297 assert(CurContext->isRecord() && "scope not record in instantiation"); 3298 LookupQualifiedName(Previous, CurContext); 3299 } 3300 3301 NestedNameSpecifier *NNS = 3302 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3303 3304 // Check for invalid redeclarations. 3305 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3306 return 0; 3307 3308 // Check for bad qualifiers. 3309 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3310 return 0; 3311 3312 DeclContext *LookupContext = computeDeclContext(SS); 3313 NamedDecl *D; 3314 if (!LookupContext) { 3315 if (IsTypeName) { 3316 // FIXME: not all declaration name kinds are legal here 3317 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3318 UsingLoc, TypenameLoc, 3319 SS.getRange(), NNS, 3320 IdentLoc, Name); 3321 } else { 3322 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3323 UsingLoc, SS.getRange(), NNS, 3324 IdentLoc, Name); 3325 } 3326 } else { 3327 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3328 SS.getRange(), UsingLoc, NNS, Name, 3329 IsTypeName); 3330 } 3331 D->setAccess(AS); 3332 CurContext->addDecl(D); 3333 3334 if (!LookupContext) return D; 3335 UsingDecl *UD = cast<UsingDecl>(D); 3336 3337 if (RequireCompleteDeclContext(SS)) { 3338 UD->setInvalidDecl(); 3339 return UD; 3340 } 3341 3342 // Look up the target name. 3343 3344 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3345 3346 // Unlike most lookups, we don't always want to hide tag 3347 // declarations: tag names are visible through the using declaration 3348 // even if hidden by ordinary names, *except* in a dependent context 3349 // where it's important for the sanity of two-phase lookup. 3350 if (!IsInstantiation) 3351 R.setHideTags(false); 3352 3353 LookupQualifiedName(R, LookupContext); 3354 3355 if (R.empty()) { 3356 Diag(IdentLoc, diag::err_no_member) 3357 << Name << LookupContext << SS.getRange(); 3358 UD->setInvalidDecl(); 3359 return UD; 3360 } 3361 3362 if (R.isAmbiguous()) { 3363 UD->setInvalidDecl(); 3364 return UD; 3365 } 3366 3367 if (IsTypeName) { 3368 // If we asked for a typename and got a non-type decl, error out. 3369 if (!R.getAsSingle<TypeDecl>()) { 3370 Diag(IdentLoc, diag::err_using_typename_non_type); 3371 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3372 Diag((*I)->getUnderlyingDecl()->getLocation(), 3373 diag::note_using_decl_target); 3374 UD->setInvalidDecl(); 3375 return UD; 3376 } 3377 } else { 3378 // If we asked for a non-typename and we got a type, error out, 3379 // but only if this is an instantiation of an unresolved using 3380 // decl. Otherwise just silently find the type name. 3381 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3382 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3383 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3384 UD->setInvalidDecl(); 3385 return UD; 3386 } 3387 } 3388 3389 // C++0x N2914 [namespace.udecl]p6: 3390 // A using-declaration shall not name a namespace. 3391 if (R.getAsSingle<NamespaceDecl>()) { 3392 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3393 << SS.getRange(); 3394 UD->setInvalidDecl(); 3395 return UD; 3396 } 3397 3398 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3399 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3400 BuildUsingShadowDecl(S, UD, *I); 3401 } 3402 3403 return UD; 3404} 3405 3406/// Checks that the given using declaration is not an invalid 3407/// redeclaration. Note that this is checking only for the using decl 3408/// itself, not for any ill-formedness among the UsingShadowDecls. 3409bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3410 bool isTypeName, 3411 const CXXScopeSpec &SS, 3412 SourceLocation NameLoc, 3413 const LookupResult &Prev) { 3414 // C++03 [namespace.udecl]p8: 3415 // C++0x [namespace.udecl]p10: 3416 // A using-declaration is a declaration and can therefore be used 3417 // repeatedly where (and only where) multiple declarations are 3418 // allowed. 3419 // That's only in file contexts. 3420 if (CurContext->getLookupContext()->isFileContext()) 3421 return false; 3422 3423 NestedNameSpecifier *Qual 3424 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3425 3426 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3427 NamedDecl *D = *I; 3428 3429 bool DTypename; 3430 NestedNameSpecifier *DQual; 3431 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3432 DTypename = UD->isTypeName(); 3433 DQual = UD->getTargetNestedNameDecl(); 3434 } else if (UnresolvedUsingValueDecl *UD 3435 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3436 DTypename = false; 3437 DQual = UD->getTargetNestedNameSpecifier(); 3438 } else if (UnresolvedUsingTypenameDecl *UD 3439 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3440 DTypename = true; 3441 DQual = UD->getTargetNestedNameSpecifier(); 3442 } else continue; 3443 3444 // using decls differ if one says 'typename' and the other doesn't. 3445 // FIXME: non-dependent using decls? 3446 if (isTypeName != DTypename) continue; 3447 3448 // using decls differ if they name different scopes (but note that 3449 // template instantiation can cause this check to trigger when it 3450 // didn't before instantiation). 3451 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3452 Context.getCanonicalNestedNameSpecifier(DQual)) 3453 continue; 3454 3455 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3456 Diag(D->getLocation(), diag::note_using_decl) << 1; 3457 return true; 3458 } 3459 3460 return false; 3461} 3462 3463 3464/// Checks that the given nested-name qualifier used in a using decl 3465/// in the current context is appropriately related to the current 3466/// scope. If an error is found, diagnoses it and returns true. 3467bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3468 const CXXScopeSpec &SS, 3469 SourceLocation NameLoc) { 3470 DeclContext *NamedContext = computeDeclContext(SS); 3471 3472 if (!CurContext->isRecord()) { 3473 // C++03 [namespace.udecl]p3: 3474 // C++0x [namespace.udecl]p8: 3475 // A using-declaration for a class member shall be a member-declaration. 3476 3477 // If we weren't able to compute a valid scope, it must be a 3478 // dependent class scope. 3479 if (!NamedContext || NamedContext->isRecord()) { 3480 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3481 << SS.getRange(); 3482 return true; 3483 } 3484 3485 // Otherwise, everything is known to be fine. 3486 return false; 3487 } 3488 3489 // The current scope is a record. 3490 3491 // If the named context is dependent, we can't decide much. 3492 if (!NamedContext) { 3493 // FIXME: in C++0x, we can diagnose if we can prove that the 3494 // nested-name-specifier does not refer to a base class, which is 3495 // still possible in some cases. 3496 3497 // Otherwise we have to conservatively report that things might be 3498 // okay. 3499 return false; 3500 } 3501 3502 if (!NamedContext->isRecord()) { 3503 // Ideally this would point at the last name in the specifier, 3504 // but we don't have that level of source info. 3505 Diag(SS.getRange().getBegin(), 3506 diag::err_using_decl_nested_name_specifier_is_not_class) 3507 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3508 return true; 3509 } 3510 3511 if (getLangOptions().CPlusPlus0x) { 3512 // C++0x [namespace.udecl]p3: 3513 // In a using-declaration used as a member-declaration, the 3514 // nested-name-specifier shall name a base class of the class 3515 // being defined. 3516 3517 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3518 cast<CXXRecordDecl>(NamedContext))) { 3519 if (CurContext == NamedContext) { 3520 Diag(NameLoc, 3521 diag::err_using_decl_nested_name_specifier_is_current_class) 3522 << SS.getRange(); 3523 return true; 3524 } 3525 3526 Diag(SS.getRange().getBegin(), 3527 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3528 << (NestedNameSpecifier*) SS.getScopeRep() 3529 << cast<CXXRecordDecl>(CurContext) 3530 << SS.getRange(); 3531 return true; 3532 } 3533 3534 return false; 3535 } 3536 3537 // C++03 [namespace.udecl]p4: 3538 // A using-declaration used as a member-declaration shall refer 3539 // to a member of a base class of the class being defined [etc.]. 3540 3541 // Salient point: SS doesn't have to name a base class as long as 3542 // lookup only finds members from base classes. Therefore we can 3543 // diagnose here only if we can prove that that can't happen, 3544 // i.e. if the class hierarchies provably don't intersect. 3545 3546 // TODO: it would be nice if "definitely valid" results were cached 3547 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3548 // need to be repeated. 3549 3550 struct UserData { 3551 llvm::DenseSet<const CXXRecordDecl*> Bases; 3552 3553 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3554 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3555 Data->Bases.insert(Base); 3556 return true; 3557 } 3558 3559 bool hasDependentBases(const CXXRecordDecl *Class) { 3560 return !Class->forallBases(collect, this); 3561 } 3562 3563 /// Returns true if the base is dependent or is one of the 3564 /// accumulated base classes. 3565 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3566 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3567 return !Data->Bases.count(Base); 3568 } 3569 3570 bool mightShareBases(const CXXRecordDecl *Class) { 3571 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3572 } 3573 }; 3574 3575 UserData Data; 3576 3577 // Returns false if we find a dependent base. 3578 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3579 return false; 3580 3581 // Returns false if the class has a dependent base or if it or one 3582 // of its bases is present in the base set of the current context. 3583 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3584 return false; 3585 3586 Diag(SS.getRange().getBegin(), 3587 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3588 << (NestedNameSpecifier*) SS.getScopeRep() 3589 << cast<CXXRecordDecl>(CurContext) 3590 << SS.getRange(); 3591 3592 return true; 3593} 3594 3595Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3596 SourceLocation NamespaceLoc, 3597 SourceLocation AliasLoc, 3598 IdentifierInfo *Alias, 3599 const CXXScopeSpec &SS, 3600 SourceLocation IdentLoc, 3601 IdentifierInfo *Ident) { 3602 3603 // Lookup the namespace name. 3604 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3605 LookupParsedName(R, S, &SS); 3606 3607 // Check if we have a previous declaration with the same name. 3608 if (NamedDecl *PrevDecl 3609 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3610 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3611 // We already have an alias with the same name that points to the same 3612 // namespace, so don't create a new one. 3613 if (!R.isAmbiguous() && !R.empty() && 3614 AD->getNamespace() == getNamespaceDecl(R.getFoundDecl())) 3615 return DeclPtrTy(); 3616 } 3617 3618 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3619 diag::err_redefinition_different_kind; 3620 Diag(AliasLoc, DiagID) << Alias; 3621 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3622 return DeclPtrTy(); 3623 } 3624 3625 if (R.isAmbiguous()) 3626 return DeclPtrTy(); 3627 3628 if (R.empty()) { 3629 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3630 return DeclPtrTy(); 3631 } 3632 3633 NamespaceAliasDecl *AliasDecl = 3634 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3635 Alias, SS.getRange(), 3636 (NestedNameSpecifier *)SS.getScopeRep(), 3637 IdentLoc, R.getFoundDecl()); 3638 3639 CurContext->addDecl(AliasDecl); 3640 return DeclPtrTy::make(AliasDecl); 3641} 3642 3643void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3644 CXXConstructorDecl *Constructor) { 3645 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3646 !Constructor->isUsed()) && 3647 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3648 3649 CXXRecordDecl *ClassDecl 3650 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3651 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3652 3653 if (SetBaseOrMemberInitializers(Constructor, 0, 0, true)) { 3654 Diag(CurrentLocation, diag::note_member_synthesized_at) 3655 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 3656 Constructor->setInvalidDecl(); 3657 } else { 3658 Constructor->setUsed(); 3659 } 3660} 3661 3662void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3663 CXXDestructorDecl *Destructor) { 3664 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3665 "DefineImplicitDestructor - call it for implicit default dtor"); 3666 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3667 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3668 // C++ [class.dtor] p5 3669 // Before the implicitly-declared default destructor for a class is 3670 // implicitly defined, all the implicitly-declared default destructors 3671 // for its base class and its non-static data members shall have been 3672 // implicitly defined. 3673 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3674 E = ClassDecl->bases_end(); Base != E; ++Base) { 3675 CXXRecordDecl *BaseClassDecl 3676 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3677 if (!BaseClassDecl->hasTrivialDestructor()) { 3678 if (CXXDestructorDecl *BaseDtor = 3679 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 3680 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 3681 else 3682 assert(false && 3683 "DefineImplicitDestructor - missing dtor in a base class"); 3684 } 3685 } 3686 3687 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3688 E = ClassDecl->field_end(); Field != E; ++Field) { 3689 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3690 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3691 FieldType = Array->getElementType(); 3692 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3693 CXXRecordDecl *FieldClassDecl 3694 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3695 if (!FieldClassDecl->hasTrivialDestructor()) { 3696 if (CXXDestructorDecl *FieldDtor = 3697 const_cast<CXXDestructorDecl*>( 3698 FieldClassDecl->getDestructor(Context))) 3699 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 3700 else 3701 assert(false && 3702 "DefineImplicitDestructor - missing dtor in class of a data member"); 3703 } 3704 } 3705 } 3706 3707 // FIXME: If CheckDestructor fails, we should emit a note about where the 3708 // implicit destructor was needed. 3709 if (CheckDestructor(Destructor)) { 3710 Diag(CurrentLocation, diag::note_member_synthesized_at) 3711 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3712 3713 Destructor->setInvalidDecl(); 3714 return; 3715 } 3716 3717 Destructor->setUsed(); 3718} 3719 3720void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3721 CXXMethodDecl *MethodDecl) { 3722 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3723 MethodDecl->getOverloadedOperator() == OO_Equal && 3724 !MethodDecl->isUsed()) && 3725 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3726 3727 CXXRecordDecl *ClassDecl 3728 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3729 3730 // C++[class.copy] p12 3731 // Before the implicitly-declared copy assignment operator for a class is 3732 // implicitly defined, all implicitly-declared copy assignment operators 3733 // for its direct base classes and its nonstatic data members shall have 3734 // been implicitly defined. 3735 bool err = false; 3736 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3737 E = ClassDecl->bases_end(); Base != E; ++Base) { 3738 CXXRecordDecl *BaseClassDecl 3739 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3740 if (CXXMethodDecl *BaseAssignOpMethod = 3741 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3742 BaseClassDecl)) 3743 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3744 } 3745 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3746 E = ClassDecl->field_end(); Field != E; ++Field) { 3747 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3748 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3749 FieldType = Array->getElementType(); 3750 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3751 CXXRecordDecl *FieldClassDecl 3752 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3753 if (CXXMethodDecl *FieldAssignOpMethod = 3754 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3755 FieldClassDecl)) 3756 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3757 } else if (FieldType->isReferenceType()) { 3758 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3759 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3760 Diag(Field->getLocation(), diag::note_declared_at); 3761 Diag(CurrentLocation, diag::note_first_required_here); 3762 err = true; 3763 } else if (FieldType.isConstQualified()) { 3764 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3765 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3766 Diag(Field->getLocation(), diag::note_declared_at); 3767 Diag(CurrentLocation, diag::note_first_required_here); 3768 err = true; 3769 } 3770 } 3771 if (!err) 3772 MethodDecl->setUsed(); 3773} 3774 3775CXXMethodDecl * 3776Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 3777 ParmVarDecl *ParmDecl, 3778 CXXRecordDecl *ClassDecl) { 3779 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3780 QualType RHSType(LHSType); 3781 // If class's assignment operator argument is const/volatile qualified, 3782 // look for operator = (const/volatile B&). Otherwise, look for 3783 // operator = (B&). 3784 RHSType = Context.getCVRQualifiedType(RHSType, 3785 ParmDecl->getType().getCVRQualifiers()); 3786 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3787 LHSType, 3788 SourceLocation())); 3789 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3790 RHSType, 3791 CurrentLocation)); 3792 Expr *Args[2] = { &*LHS, &*RHS }; 3793 OverloadCandidateSet CandidateSet; 3794 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3795 CandidateSet); 3796 OverloadCandidateSet::iterator Best; 3797 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 3798 return cast<CXXMethodDecl>(Best->Function); 3799 assert(false && 3800 "getAssignOperatorMethod - copy assignment operator method not found"); 3801 return 0; 3802} 3803 3804void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3805 CXXConstructorDecl *CopyConstructor, 3806 unsigned TypeQuals) { 3807 assert((CopyConstructor->isImplicit() && 3808 CopyConstructor->isCopyConstructor(TypeQuals) && 3809 !CopyConstructor->isUsed()) && 3810 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3811 3812 CXXRecordDecl *ClassDecl 3813 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3814 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3815 // C++ [class.copy] p209 3816 // Before the implicitly-declared copy constructor for a class is 3817 // implicitly defined, all the implicitly-declared copy constructors 3818 // for its base class and its non-static data members shall have been 3819 // implicitly defined. 3820 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3821 Base != ClassDecl->bases_end(); ++Base) { 3822 CXXRecordDecl *BaseClassDecl 3823 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3824 if (CXXConstructorDecl *BaseCopyCtor = 3825 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 3826 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3827 } 3828 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3829 FieldEnd = ClassDecl->field_end(); 3830 Field != FieldEnd; ++Field) { 3831 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3832 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3833 FieldType = Array->getElementType(); 3834 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3835 CXXRecordDecl *FieldClassDecl 3836 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3837 if (CXXConstructorDecl *FieldCopyCtor = 3838 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 3839 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3840 } 3841 } 3842 CopyConstructor->setUsed(); 3843} 3844 3845Sema::OwningExprResult 3846Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3847 CXXConstructorDecl *Constructor, 3848 MultiExprArg ExprArgs, 3849 bool RequiresZeroInit) { 3850 bool Elidable = false; 3851 3852 // C++ [class.copy]p15: 3853 // Whenever a temporary class object is copied using a copy constructor, and 3854 // this object and the copy have the same cv-unqualified type, an 3855 // implementation is permitted to treat the original and the copy as two 3856 // different ways of referring to the same object and not perform a copy at 3857 // all, even if the class copy constructor or destructor have side effects. 3858 3859 // FIXME: Is this enough? 3860 if (Constructor->isCopyConstructor()) { 3861 Expr *E = ((Expr **)ExprArgs.get())[0]; 3862 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3863 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3864 E = ICE->getSubExpr(); 3865 if (CXXFunctionalCastExpr *FCE = dyn_cast<CXXFunctionalCastExpr>(E)) 3866 E = FCE->getSubExpr(); 3867 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 3868 E = BE->getSubExpr(); 3869 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3870 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3871 E = ICE->getSubExpr(); 3872 3873 if (CallExpr *CE = dyn_cast<CallExpr>(E)) 3874 Elidable = !CE->getCallReturnType()->isReferenceType(); 3875 else if (isa<CXXTemporaryObjectExpr>(E)) 3876 Elidable = true; 3877 else if (isa<CXXConstructExpr>(E)) 3878 Elidable = true; 3879 } 3880 3881 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 3882 Elidable, move(ExprArgs), RequiresZeroInit); 3883} 3884 3885/// BuildCXXConstructExpr - Creates a complete call to a constructor, 3886/// including handling of its default argument expressions. 3887Sema::OwningExprResult 3888Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3889 CXXConstructorDecl *Constructor, bool Elidable, 3890 MultiExprArg ExprArgs, 3891 bool RequiresZeroInit) { 3892 unsigned NumExprs = ExprArgs.size(); 3893 Expr **Exprs = (Expr **)ExprArgs.release(); 3894 3895 MarkDeclarationReferenced(ConstructLoc, Constructor); 3896 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 3897 Constructor, Elidable, Exprs, NumExprs, 3898 RequiresZeroInit)); 3899} 3900 3901Sema::OwningExprResult 3902Sema::BuildCXXTemporaryObjectExpr(CXXConstructorDecl *Constructor, 3903 QualType Ty, 3904 SourceLocation TyBeginLoc, 3905 MultiExprArg Args, 3906 SourceLocation RParenLoc) { 3907 unsigned NumExprs = Args.size(); 3908 Expr **Exprs = (Expr **)Args.release(); 3909 3910 MarkDeclarationReferenced(TyBeginLoc, Constructor); 3911 return Owned(new (Context) CXXTemporaryObjectExpr(Context, Constructor, Ty, 3912 TyBeginLoc, Exprs, 3913 NumExprs, RParenLoc)); 3914} 3915 3916 3917bool Sema::InitializeVarWithConstructor(VarDecl *VD, 3918 CXXConstructorDecl *Constructor, 3919 MultiExprArg Exprs) { 3920 OwningExprResult TempResult = 3921 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 3922 move(Exprs)); 3923 if (TempResult.isInvalid()) 3924 return true; 3925 3926 Expr *Temp = TempResult.takeAs<Expr>(); 3927 MarkDeclarationReferenced(VD->getLocation(), Constructor); 3928 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 3929 VD->setInit(Context, Temp); 3930 3931 return false; 3932} 3933 3934void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) { 3935 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 3936 DeclInitType->getAs<RecordType>()->getDecl()); 3937 if (!ClassDecl->hasTrivialDestructor()) 3938 if (CXXDestructorDecl *Destructor = 3939 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 3940 MarkDeclarationReferenced(VD->getLocation(), Destructor); 3941} 3942 3943/// AddCXXDirectInitializerToDecl - This action is called immediately after 3944/// ActOnDeclarator, when a C++ direct initializer is present. 3945/// e.g: "int x(1);" 3946void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 3947 SourceLocation LParenLoc, 3948 MultiExprArg Exprs, 3949 SourceLocation *CommaLocs, 3950 SourceLocation RParenLoc) { 3951 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 3952 Decl *RealDecl = Dcl.getAs<Decl>(); 3953 3954 // If there is no declaration, there was an error parsing it. Just ignore 3955 // the initializer. 3956 if (RealDecl == 0) 3957 return; 3958 3959 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3960 if (!VDecl) { 3961 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3962 RealDecl->setInvalidDecl(); 3963 return; 3964 } 3965 3966 // We will represent direct-initialization similarly to copy-initialization: 3967 // int x(1); -as-> int x = 1; 3968 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 3969 // 3970 // Clients that want to distinguish between the two forms, can check for 3971 // direct initializer using VarDecl::hasCXXDirectInitializer(). 3972 // A major benefit is that clients that don't particularly care about which 3973 // exactly form was it (like the CodeGen) can handle both cases without 3974 // special case code. 3975 3976 // If either the declaration has a dependent type or if any of the expressions 3977 // is type-dependent, we represent the initialization via a ParenListExpr for 3978 // later use during template instantiation. 3979 if (VDecl->getType()->isDependentType() || 3980 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 3981 // Let clients know that initialization was done with a direct initializer. 3982 VDecl->setCXXDirectInitializer(true); 3983 3984 // Store the initialization expressions as a ParenListExpr. 3985 unsigned NumExprs = Exprs.size(); 3986 VDecl->setInit(Context, 3987 new (Context) ParenListExpr(Context, LParenLoc, 3988 (Expr **)Exprs.release(), 3989 NumExprs, RParenLoc)); 3990 return; 3991 } 3992 3993 3994 // C++ 8.5p11: 3995 // The form of initialization (using parentheses or '=') is generally 3996 // insignificant, but does matter when the entity being initialized has a 3997 // class type. 3998 QualType DeclInitType = VDecl->getType(); 3999 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4000 DeclInitType = Context.getBaseElementType(Array); 4001 4002 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4003 diag::err_typecheck_decl_incomplete_type)) { 4004 VDecl->setInvalidDecl(); 4005 return; 4006 } 4007 4008 // The variable can not have an abstract class type. 4009 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4010 diag::err_abstract_type_in_decl, 4011 AbstractVariableType)) 4012 VDecl->setInvalidDecl(); 4013 4014 const VarDecl *Def = 0; 4015 if (VDecl->getDefinition(Def)) { 4016 Diag(VDecl->getLocation(), diag::err_redefinition) 4017 << VDecl->getDeclName(); 4018 Diag(Def->getLocation(), diag::note_previous_definition); 4019 VDecl->setInvalidDecl(); 4020 return; 4021 } 4022 4023 // Capture the variable that is being initialized and the style of 4024 // initialization. 4025 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4026 4027 // FIXME: Poor source location information. 4028 InitializationKind Kind 4029 = InitializationKind::CreateDirect(VDecl->getLocation(), 4030 LParenLoc, RParenLoc); 4031 4032 InitializationSequence InitSeq(*this, Entity, Kind, 4033 (Expr**)Exprs.get(), Exprs.size()); 4034 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4035 if (Result.isInvalid()) { 4036 VDecl->setInvalidDecl(); 4037 return; 4038 } 4039 4040 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4041 VDecl->setInit(Context, Result.takeAs<Expr>()); 4042 VDecl->setCXXDirectInitializer(true); 4043 4044 if (VDecl->getType()->getAs<RecordType>()) 4045 FinalizeVarWithDestructor(VDecl, DeclInitType); 4046} 4047 4048/// \brief Add the applicable constructor candidates for an initialization 4049/// by constructor. 4050static void AddConstructorInitializationCandidates(Sema &SemaRef, 4051 QualType ClassType, 4052 Expr **Args, 4053 unsigned NumArgs, 4054 InitializationKind Kind, 4055 OverloadCandidateSet &CandidateSet) { 4056 // C++ [dcl.init]p14: 4057 // If the initialization is direct-initialization, or if it is 4058 // copy-initialization where the cv-unqualified version of the 4059 // source type is the same class as, or a derived class of, the 4060 // class of the destination, constructors are considered. The 4061 // applicable constructors are enumerated (13.3.1.3), and the 4062 // best one is chosen through overload resolution (13.3). The 4063 // constructor so selected is called to initialize the object, 4064 // with the initializer expression(s) as its argument(s). If no 4065 // constructor applies, or the overload resolution is ambiguous, 4066 // the initialization is ill-formed. 4067 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 4068 assert(ClassRec && "Can only initialize a class type here"); 4069 4070 // FIXME: When we decide not to synthesize the implicitly-declared 4071 // constructors, we'll need to make them appear here. 4072 4073 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 4074 DeclarationName ConstructorName 4075 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 4076 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 4077 DeclContext::lookup_const_iterator Con, ConEnd; 4078 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 4079 Con != ConEnd; ++Con) { 4080 // Find the constructor (which may be a template). 4081 CXXConstructorDecl *Constructor = 0; 4082 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 4083 if (ConstructorTmpl) 4084 Constructor 4085 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 4086 else 4087 Constructor = cast<CXXConstructorDecl>(*Con); 4088 4089 if ((Kind.getKind() == InitializationKind::IK_Direct) || 4090 (Kind.getKind() == InitializationKind::IK_Value) || 4091 (Kind.getKind() == InitializationKind::IK_Copy && 4092 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 4093 ((Kind.getKind() == InitializationKind::IK_Default) && 4094 Constructor->isDefaultConstructor())) { 4095 if (ConstructorTmpl) 4096 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, 4097 /*ExplicitArgs*/ 0, 4098 Args, NumArgs, CandidateSet); 4099 else 4100 SemaRef.AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 4101 } 4102 } 4103} 4104 4105/// \brief Attempt to perform initialization by constructor 4106/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 4107/// copy-initialization. 4108/// 4109/// This routine determines whether initialization by constructor is possible, 4110/// but it does not emit any diagnostics in the case where the initialization 4111/// is ill-formed. 4112/// 4113/// \param ClassType the type of the object being initialized, which must have 4114/// class type. 4115/// 4116/// \param Args the arguments provided to initialize the object 4117/// 4118/// \param NumArgs the number of arguments provided to initialize the object 4119/// 4120/// \param Kind the type of initialization being performed 4121/// 4122/// \returns the constructor used to initialize the object, if successful. 4123/// Otherwise, emits a diagnostic and returns NULL. 4124CXXConstructorDecl * 4125Sema::TryInitializationByConstructor(QualType ClassType, 4126 Expr **Args, unsigned NumArgs, 4127 SourceLocation Loc, 4128 InitializationKind Kind) { 4129 // Build the overload candidate set 4130 OverloadCandidateSet CandidateSet; 4131 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4132 CandidateSet); 4133 4134 // Determine whether we found a constructor we can use. 4135 OverloadCandidateSet::iterator Best; 4136 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4137 case OR_Success: 4138 case OR_Deleted: 4139 // We found a constructor. Return it. 4140 return cast<CXXConstructorDecl>(Best->Function); 4141 4142 case OR_No_Viable_Function: 4143 case OR_Ambiguous: 4144 // Overload resolution failed. Return nothing. 4145 return 0; 4146 } 4147 4148 // Silence GCC warning 4149 return 0; 4150} 4151 4152/// \brief Perform initialization by constructor (C++ [dcl.init]p14), which 4153/// may occur as part of direct-initialization or copy-initialization. 4154/// 4155/// \param ClassType the type of the object being initialized, which must have 4156/// class type. 4157/// 4158/// \param ArgsPtr the arguments provided to initialize the object 4159/// 4160/// \param Loc the source location where the initialization occurs 4161/// 4162/// \param Range the source range that covers the entire initialization 4163/// 4164/// \param InitEntity the name of the entity being initialized, if known 4165/// 4166/// \param Kind the type of initialization being performed 4167/// 4168/// \param ConvertedArgs a vector that will be filled in with the 4169/// appropriately-converted arguments to the constructor (if initialization 4170/// succeeded). 4171/// 4172/// \returns the constructor used to initialize the object, if successful. 4173/// Otherwise, emits a diagnostic and returns NULL. 4174CXXConstructorDecl * 4175Sema::PerformInitializationByConstructor(QualType ClassType, 4176 MultiExprArg ArgsPtr, 4177 SourceLocation Loc, SourceRange Range, 4178 DeclarationName InitEntity, 4179 InitializationKind Kind, 4180 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4181 4182 // Build the overload candidate set 4183 Expr **Args = (Expr **)ArgsPtr.get(); 4184 unsigned NumArgs = ArgsPtr.size(); 4185 OverloadCandidateSet CandidateSet; 4186 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4187 CandidateSet); 4188 4189 OverloadCandidateSet::iterator Best; 4190 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4191 case OR_Success: 4192 // We found a constructor. Break out so that we can convert the arguments 4193 // appropriately. 4194 break; 4195 4196 case OR_No_Viable_Function: 4197 if (InitEntity) 4198 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 4199 << InitEntity << Range; 4200 else 4201 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 4202 << ClassType << Range; 4203 PrintOverloadCandidates(CandidateSet, OCD_AllCandidates); 4204 return 0; 4205 4206 case OR_Ambiguous: 4207 if (InitEntity) 4208 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 4209 else 4210 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 4211 PrintOverloadCandidates(CandidateSet, OCD_ViableCandidates); 4212 return 0; 4213 4214 case OR_Deleted: 4215 if (InitEntity) 4216 Diag(Loc, diag::err_ovl_deleted_init) 4217 << Best->Function->isDeleted() 4218 << InitEntity << Range; 4219 else { 4220 const CXXRecordDecl *RD = 4221 cast<CXXRecordDecl>(ClassType->getAs<RecordType>()->getDecl()); 4222 Diag(Loc, diag::err_ovl_deleted_init) 4223 << Best->Function->isDeleted() 4224 << RD->getDeclName() << Range; 4225 } 4226 PrintOverloadCandidates(CandidateSet, OCD_AllCandidates); 4227 return 0; 4228 } 4229 4230 // Convert the arguments, fill in default arguments, etc. 4231 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function); 4232 if (CompleteConstructorCall(Constructor, move(ArgsPtr), Loc, ConvertedArgs)) 4233 return 0; 4234 4235 return Constructor; 4236} 4237 4238/// \brief Given a constructor and the set of arguments provided for the 4239/// constructor, convert the arguments and add any required default arguments 4240/// to form a proper call to this constructor. 4241/// 4242/// \returns true if an error occurred, false otherwise. 4243bool 4244Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4245 MultiExprArg ArgsPtr, 4246 SourceLocation Loc, 4247 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4248 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4249 unsigned NumArgs = ArgsPtr.size(); 4250 Expr **Args = (Expr **)ArgsPtr.get(); 4251 4252 const FunctionProtoType *Proto 4253 = Constructor->getType()->getAs<FunctionProtoType>(); 4254 assert(Proto && "Constructor without a prototype?"); 4255 unsigned NumArgsInProto = Proto->getNumArgs(); 4256 4257 // If too few arguments are available, we'll fill in the rest with defaults. 4258 if (NumArgs < NumArgsInProto) 4259 ConvertedArgs.reserve(NumArgsInProto); 4260 else 4261 ConvertedArgs.reserve(NumArgs); 4262 4263 VariadicCallType CallType = 4264 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4265 llvm::SmallVector<Expr *, 8> AllArgs; 4266 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4267 Proto, 0, Args, NumArgs, AllArgs, 4268 CallType); 4269 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4270 ConvertedArgs.push_back(AllArgs[i]); 4271 return Invalid; 4272} 4273 4274/// CompareReferenceRelationship - Compare the two types T1 and T2 to 4275/// determine whether they are reference-related, 4276/// reference-compatible, reference-compatible with added 4277/// qualification, or incompatible, for use in C++ initialization by 4278/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 4279/// type, and the first type (T1) is the pointee type of the reference 4280/// type being initialized. 4281Sema::ReferenceCompareResult 4282Sema::CompareReferenceRelationship(SourceLocation Loc, 4283 QualType OrigT1, QualType OrigT2, 4284 bool& DerivedToBase) { 4285 assert(!OrigT1->isReferenceType() && 4286 "T1 must be the pointee type of the reference type"); 4287 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 4288 4289 QualType T1 = Context.getCanonicalType(OrigT1); 4290 QualType T2 = Context.getCanonicalType(OrigT2); 4291 Qualifiers T1Quals, T2Quals; 4292 QualType UnqualT1 = Context.getUnqualifiedArrayType(T1, T1Quals); 4293 QualType UnqualT2 = Context.getUnqualifiedArrayType(T2, T2Quals); 4294 4295 // C++ [dcl.init.ref]p4: 4296 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 4297 // reference-related to "cv2 T2" if T1 is the same type as T2, or 4298 // T1 is a base class of T2. 4299 if (UnqualT1 == UnqualT2) 4300 DerivedToBase = false; 4301 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 4302 !RequireCompleteType(Loc, OrigT2, PDiag()) && 4303 IsDerivedFrom(UnqualT2, UnqualT1)) 4304 DerivedToBase = true; 4305 else 4306 return Ref_Incompatible; 4307 4308 // At this point, we know that T1 and T2 are reference-related (at 4309 // least). 4310 4311 // If the type is an array type, promote the element qualifiers to the type 4312 // for comparison. 4313 if (isa<ArrayType>(T1) && T1Quals) 4314 T1 = Context.getQualifiedType(UnqualT1, T1Quals); 4315 if (isa<ArrayType>(T2) && T2Quals) 4316 T2 = Context.getQualifiedType(UnqualT2, T2Quals); 4317 4318 // C++ [dcl.init.ref]p4: 4319 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 4320 // reference-related to T2 and cv1 is the same cv-qualification 4321 // as, or greater cv-qualification than, cv2. For purposes of 4322 // overload resolution, cases for which cv1 is greater 4323 // cv-qualification than cv2 are identified as 4324 // reference-compatible with added qualification (see 13.3.3.2). 4325 if (T1Quals.getCVRQualifiers() == T2Quals.getCVRQualifiers()) 4326 return Ref_Compatible; 4327 else if (T1.isMoreQualifiedThan(T2)) 4328 return Ref_Compatible_With_Added_Qualification; 4329 else 4330 return Ref_Related; 4331} 4332 4333/// CheckReferenceInit - Check the initialization of a reference 4334/// variable with the given initializer (C++ [dcl.init.ref]). Init is 4335/// the initializer (either a simple initializer or an initializer 4336/// list), and DeclType is the type of the declaration. When ICS is 4337/// non-null, this routine will compute the implicit conversion 4338/// sequence according to C++ [over.ics.ref] and will not produce any 4339/// diagnostics; when ICS is null, it will emit diagnostics when any 4340/// errors are found. Either way, a return value of true indicates 4341/// that there was a failure, a return value of false indicates that 4342/// the reference initialization succeeded. 4343/// 4344/// When @p SuppressUserConversions, user-defined conversions are 4345/// suppressed. 4346/// When @p AllowExplicit, we also permit explicit user-defined 4347/// conversion functions. 4348/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 4349/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 4350/// This is used when this is called from a C-style cast. 4351bool 4352Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 4353 SourceLocation DeclLoc, 4354 bool SuppressUserConversions, 4355 bool AllowExplicit, bool ForceRValue, 4356 ImplicitConversionSequence *ICS, 4357 bool IgnoreBaseAccess) { 4358 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 4359 4360 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 4361 QualType T2 = Init->getType(); 4362 4363 // If the initializer is the address of an overloaded function, try 4364 // to resolve the overloaded function. If all goes well, T2 is the 4365 // type of the resulting function. 4366 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 4367 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 4368 ICS != 0); 4369 if (Fn) { 4370 // Since we're performing this reference-initialization for 4371 // real, update the initializer with the resulting function. 4372 if (!ICS) { 4373 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 4374 return true; 4375 4376 Init = FixOverloadedFunctionReference(Init, Fn); 4377 } 4378 4379 T2 = Fn->getType(); 4380 } 4381 } 4382 4383 // Compute some basic properties of the types and the initializer. 4384 bool isRValRef = DeclType->isRValueReferenceType(); 4385 bool DerivedToBase = false; 4386 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 4387 Init->isLvalue(Context); 4388 ReferenceCompareResult RefRelationship 4389 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 4390 4391 // Most paths end in a failed conversion. 4392 if (ICS) ICS->setBad(); 4393 4394 // C++ [dcl.init.ref]p5: 4395 // A reference to type "cv1 T1" is initialized by an expression 4396 // of type "cv2 T2" as follows: 4397 4398 // -- If the initializer expression 4399 4400 // Rvalue references cannot bind to lvalues (N2812). 4401 // There is absolutely no situation where they can. In particular, note that 4402 // this is ill-formed, even if B has a user-defined conversion to A&&: 4403 // B b; 4404 // A&& r = b; 4405 if (isRValRef && InitLvalue == Expr::LV_Valid) { 4406 if (!ICS) 4407 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4408 << Init->getSourceRange(); 4409 return true; 4410 } 4411 4412 bool BindsDirectly = false; 4413 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 4414 // reference-compatible with "cv2 T2," or 4415 // 4416 // Note that the bit-field check is skipped if we are just computing 4417 // the implicit conversion sequence (C++ [over.best.ics]p2). 4418 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 4419 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4420 BindsDirectly = true; 4421 4422 if (ICS) { 4423 // C++ [over.ics.ref]p1: 4424 // When a parameter of reference type binds directly (8.5.3) 4425 // to an argument expression, the implicit conversion sequence 4426 // is the identity conversion, unless the argument expression 4427 // has a type that is a derived class of the parameter type, 4428 // in which case the implicit conversion sequence is a 4429 // derived-to-base Conversion (13.3.3.1). 4430 ICS->setStandard(); 4431 ICS->Standard.First = ICK_Identity; 4432 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4433 ICS->Standard.Third = ICK_Identity; 4434 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4435 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 4436 ICS->Standard.ReferenceBinding = true; 4437 ICS->Standard.DirectBinding = true; 4438 ICS->Standard.RRefBinding = false; 4439 ICS->Standard.CopyConstructor = 0; 4440 4441 // Nothing more to do: the inaccessibility/ambiguity check for 4442 // derived-to-base conversions is suppressed when we're 4443 // computing the implicit conversion sequence (C++ 4444 // [over.best.ics]p2). 4445 return false; 4446 } else { 4447 // Perform the conversion. 4448 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4449 if (DerivedToBase) 4450 CK = CastExpr::CK_DerivedToBase; 4451 else if(CheckExceptionSpecCompatibility(Init, T1)) 4452 return true; 4453 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 4454 } 4455 } 4456 4457 // -- has a class type (i.e., T2 is a class type) and can be 4458 // implicitly converted to an lvalue of type "cv3 T3," 4459 // where "cv1 T1" is reference-compatible with "cv3 T3" 4460 // 92) (this conversion is selected by enumerating the 4461 // applicable conversion functions (13.3.1.6) and choosing 4462 // the best one through overload resolution (13.3)), 4463 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 4464 !RequireCompleteType(DeclLoc, T2, 0)) { 4465 CXXRecordDecl *T2RecordDecl 4466 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 4467 4468 OverloadCandidateSet CandidateSet; 4469 const UnresolvedSet *Conversions 4470 = T2RecordDecl->getVisibleConversionFunctions(); 4471 for (UnresolvedSet::iterator I = Conversions->begin(), 4472 E = Conversions->end(); I != E; ++I) { 4473 NamedDecl *D = *I; 4474 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); 4475 if (isa<UsingShadowDecl>(D)) 4476 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 4477 4478 FunctionTemplateDecl *ConvTemplate 4479 = dyn_cast<FunctionTemplateDecl>(D); 4480 CXXConversionDecl *Conv; 4481 if (ConvTemplate) 4482 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 4483 else 4484 Conv = cast<CXXConversionDecl>(D); 4485 4486 // If the conversion function doesn't return a reference type, 4487 // it can't be considered for this conversion. 4488 if (Conv->getConversionType()->isLValueReferenceType() && 4489 (AllowExplicit || !Conv->isExplicit())) { 4490 if (ConvTemplate) 4491 AddTemplateConversionCandidate(ConvTemplate, ActingDC, 4492 Init, DeclType, CandidateSet); 4493 else 4494 AddConversionCandidate(Conv, ActingDC, Init, DeclType, CandidateSet); 4495 } 4496 } 4497 4498 OverloadCandidateSet::iterator Best; 4499 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 4500 case OR_Success: 4501 // This is a direct binding. 4502 BindsDirectly = true; 4503 4504 if (ICS) { 4505 // C++ [over.ics.ref]p1: 4506 // 4507 // [...] If the parameter binds directly to the result of 4508 // applying a conversion function to the argument 4509 // expression, the implicit conversion sequence is a 4510 // user-defined conversion sequence (13.3.3.1.2), with the 4511 // second standard conversion sequence either an identity 4512 // conversion or, if the conversion function returns an 4513 // entity of a type that is a derived class of the parameter 4514 // type, a derived-to-base Conversion. 4515 ICS->setUserDefined(); 4516 ICS->UserDefined.Before = Best->Conversions[0].Standard; 4517 ICS->UserDefined.After = Best->FinalConversion; 4518 ICS->UserDefined.ConversionFunction = Best->Function; 4519 ICS->UserDefined.EllipsisConversion = false; 4520 assert(ICS->UserDefined.After.ReferenceBinding && 4521 ICS->UserDefined.After.DirectBinding && 4522 "Expected a direct reference binding!"); 4523 return false; 4524 } else { 4525 OwningExprResult InitConversion = 4526 BuildCXXCastArgument(DeclLoc, QualType(), 4527 CastExpr::CK_UserDefinedConversion, 4528 cast<CXXMethodDecl>(Best->Function), 4529 Owned(Init)); 4530 Init = InitConversion.takeAs<Expr>(); 4531 4532 if (CheckExceptionSpecCompatibility(Init, T1)) 4533 return true; 4534 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 4535 /*isLvalue=*/true); 4536 } 4537 break; 4538 4539 case OR_Ambiguous: 4540 if (ICS) { 4541 ICS->setAmbiguous(); 4542 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 4543 Cand != CandidateSet.end(); ++Cand) 4544 if (Cand->Viable) 4545 ICS->Ambiguous.addConversion(Cand->Function); 4546 break; 4547 } 4548 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 4549 << Init->getSourceRange(); 4550 PrintOverloadCandidates(CandidateSet, OCD_ViableCandidates); 4551 return true; 4552 4553 case OR_No_Viable_Function: 4554 case OR_Deleted: 4555 // There was no suitable conversion, or we found a deleted 4556 // conversion; continue with other checks. 4557 break; 4558 } 4559 } 4560 4561 if (BindsDirectly) { 4562 // C++ [dcl.init.ref]p4: 4563 // [...] In all cases where the reference-related or 4564 // reference-compatible relationship of two types is used to 4565 // establish the validity of a reference binding, and T1 is a 4566 // base class of T2, a program that necessitates such a binding 4567 // is ill-formed if T1 is an inaccessible (clause 11) or 4568 // ambiguous (10.2) base class of T2. 4569 // 4570 // Note that we only check this condition when we're allowed to 4571 // complain about errors, because we should not be checking for 4572 // ambiguity (or inaccessibility) unless the reference binding 4573 // actually happens. 4574 if (DerivedToBase) 4575 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 4576 Init->getSourceRange(), 4577 IgnoreBaseAccess); 4578 else 4579 return false; 4580 } 4581 4582 // -- Otherwise, the reference shall be to a non-volatile const 4583 // type (i.e., cv1 shall be const), or the reference shall be an 4584 // rvalue reference and the initializer expression shall be an rvalue. 4585 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4586 if (!ICS) 4587 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4588 << T1 << int(InitLvalue != Expr::LV_Valid) 4589 << T2 << Init->getSourceRange(); 4590 return true; 4591 } 4592 4593 // -- If the initializer expression is an rvalue, with T2 a 4594 // class type, and "cv1 T1" is reference-compatible with 4595 // "cv2 T2," the reference is bound in one of the 4596 // following ways (the choice is implementation-defined): 4597 // 4598 // -- The reference is bound to the object represented by 4599 // the rvalue (see 3.10) or to a sub-object within that 4600 // object. 4601 // 4602 // -- A temporary of type "cv1 T2" [sic] is created, and 4603 // a constructor is called to copy the entire rvalue 4604 // object into the temporary. The reference is bound to 4605 // the temporary or to a sub-object within the 4606 // temporary. 4607 // 4608 // The constructor that would be used to make the copy 4609 // shall be callable whether or not the copy is actually 4610 // done. 4611 // 4612 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4613 // freedom, so we will always take the first option and never build 4614 // a temporary in this case. FIXME: We will, however, have to check 4615 // for the presence of a copy constructor in C++98/03 mode. 4616 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4617 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4618 if (ICS) { 4619 ICS->setStandard(); 4620 ICS->Standard.First = ICK_Identity; 4621 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4622 ICS->Standard.Third = ICK_Identity; 4623 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4624 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 4625 ICS->Standard.ReferenceBinding = true; 4626 ICS->Standard.DirectBinding = false; 4627 ICS->Standard.RRefBinding = isRValRef; 4628 ICS->Standard.CopyConstructor = 0; 4629 } else { 4630 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4631 if (DerivedToBase) 4632 CK = CastExpr::CK_DerivedToBase; 4633 else if(CheckExceptionSpecCompatibility(Init, T1)) 4634 return true; 4635 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4636 } 4637 return false; 4638 } 4639 4640 // -- Otherwise, a temporary of type "cv1 T1" is created and 4641 // initialized from the initializer expression using the 4642 // rules for a non-reference copy initialization (8.5). The 4643 // reference is then bound to the temporary. If T1 is 4644 // reference-related to T2, cv1 must be the same 4645 // cv-qualification as, or greater cv-qualification than, 4646 // cv2; otherwise, the program is ill-formed. 4647 if (RefRelationship == Ref_Related) { 4648 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4649 // we would be reference-compatible or reference-compatible with 4650 // added qualification. But that wasn't the case, so the reference 4651 // initialization fails. 4652 if (!ICS) 4653 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4654 << T1 << int(InitLvalue != Expr::LV_Valid) 4655 << T2 << Init->getSourceRange(); 4656 return true; 4657 } 4658 4659 // If at least one of the types is a class type, the types are not 4660 // related, and we aren't allowed any user conversions, the 4661 // reference binding fails. This case is important for breaking 4662 // recursion, since TryImplicitConversion below will attempt to 4663 // create a temporary through the use of a copy constructor. 4664 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4665 (T1->isRecordType() || T2->isRecordType())) { 4666 if (!ICS) 4667 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4668 << DeclType << Init->getType() << AA_Initializing << Init->getSourceRange(); 4669 return true; 4670 } 4671 4672 // Actually try to convert the initializer to T1. 4673 if (ICS) { 4674 // C++ [over.ics.ref]p2: 4675 // 4676 // When a parameter of reference type is not bound directly to 4677 // an argument expression, the conversion sequence is the one 4678 // required to convert the argument expression to the 4679 // underlying type of the reference according to 4680 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4681 // to copy-initializing a temporary of the underlying type with 4682 // the argument expression. Any difference in top-level 4683 // cv-qualification is subsumed by the initialization itself 4684 // and does not constitute a conversion. 4685 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4686 /*AllowExplicit=*/false, 4687 /*ForceRValue=*/false, 4688 /*InOverloadResolution=*/false); 4689 4690 // Of course, that's still a reference binding. 4691 if (ICS->isStandard()) { 4692 ICS->Standard.ReferenceBinding = true; 4693 ICS->Standard.RRefBinding = isRValRef; 4694 } else if (ICS->isUserDefined()) { 4695 ICS->UserDefined.After.ReferenceBinding = true; 4696 ICS->UserDefined.After.RRefBinding = isRValRef; 4697 } 4698 return ICS->isBad(); 4699 } else { 4700 ImplicitConversionSequence Conversions; 4701 bool badConversion = PerformImplicitConversion(Init, T1, AA_Initializing, 4702 false, false, 4703 Conversions); 4704 if (badConversion) { 4705 if (Conversions.isAmbiguous()) { 4706 Diag(DeclLoc, 4707 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4708 for (int j = Conversions.Ambiguous.conversions().size()-1; 4709 j >= 0; j--) { 4710 FunctionDecl *Func = Conversions.Ambiguous.conversions()[j]; 4711 NoteOverloadCandidate(Func); 4712 } 4713 } 4714 else { 4715 if (isRValRef) 4716 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4717 << Init->getSourceRange(); 4718 else 4719 Diag(DeclLoc, diag::err_invalid_initialization) 4720 << DeclType << Init->getType() << Init->getSourceRange(); 4721 } 4722 } 4723 return badConversion; 4724 } 4725} 4726 4727static inline bool 4728CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4729 const FunctionDecl *FnDecl) { 4730 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4731 if (isa<NamespaceDecl>(DC)) { 4732 return SemaRef.Diag(FnDecl->getLocation(), 4733 diag::err_operator_new_delete_declared_in_namespace) 4734 << FnDecl->getDeclName(); 4735 } 4736 4737 if (isa<TranslationUnitDecl>(DC) && 4738 FnDecl->getStorageClass() == FunctionDecl::Static) { 4739 return SemaRef.Diag(FnDecl->getLocation(), 4740 diag::err_operator_new_delete_declared_static) 4741 << FnDecl->getDeclName(); 4742 } 4743 4744 return false; 4745} 4746 4747static inline bool 4748CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4749 CanQualType ExpectedResultType, 4750 CanQualType ExpectedFirstParamType, 4751 unsigned DependentParamTypeDiag, 4752 unsigned InvalidParamTypeDiag) { 4753 QualType ResultType = 4754 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4755 4756 // Check that the result type is not dependent. 4757 if (ResultType->isDependentType()) 4758 return SemaRef.Diag(FnDecl->getLocation(), 4759 diag::err_operator_new_delete_dependent_result_type) 4760 << FnDecl->getDeclName() << ExpectedResultType; 4761 4762 // Check that the result type is what we expect. 4763 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4764 return SemaRef.Diag(FnDecl->getLocation(), 4765 diag::err_operator_new_delete_invalid_result_type) 4766 << FnDecl->getDeclName() << ExpectedResultType; 4767 4768 // A function template must have at least 2 parameters. 4769 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4770 return SemaRef.Diag(FnDecl->getLocation(), 4771 diag::err_operator_new_delete_template_too_few_parameters) 4772 << FnDecl->getDeclName(); 4773 4774 // The function decl must have at least 1 parameter. 4775 if (FnDecl->getNumParams() == 0) 4776 return SemaRef.Diag(FnDecl->getLocation(), 4777 diag::err_operator_new_delete_too_few_parameters) 4778 << FnDecl->getDeclName(); 4779 4780 // Check the the first parameter type is not dependent. 4781 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4782 if (FirstParamType->isDependentType()) 4783 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4784 << FnDecl->getDeclName() << ExpectedFirstParamType; 4785 4786 // Check that the first parameter type is what we expect. 4787 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4788 ExpectedFirstParamType) 4789 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4790 << FnDecl->getDeclName() << ExpectedFirstParamType; 4791 4792 return false; 4793} 4794 4795static bool 4796CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4797 // C++ [basic.stc.dynamic.allocation]p1: 4798 // A program is ill-formed if an allocation function is declared in a 4799 // namespace scope other than global scope or declared static in global 4800 // scope. 4801 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4802 return true; 4803 4804 CanQualType SizeTy = 4805 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4806 4807 // C++ [basic.stc.dynamic.allocation]p1: 4808 // The return type shall be void*. The first parameter shall have type 4809 // std::size_t. 4810 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4811 SizeTy, 4812 diag::err_operator_new_dependent_param_type, 4813 diag::err_operator_new_param_type)) 4814 return true; 4815 4816 // C++ [basic.stc.dynamic.allocation]p1: 4817 // The first parameter shall not have an associated default argument. 4818 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4819 return SemaRef.Diag(FnDecl->getLocation(), 4820 diag::err_operator_new_default_arg) 4821 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4822 4823 return false; 4824} 4825 4826static bool 4827CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4828 // C++ [basic.stc.dynamic.deallocation]p1: 4829 // A program is ill-formed if deallocation functions are declared in a 4830 // namespace scope other than global scope or declared static in global 4831 // scope. 4832 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4833 return true; 4834 4835 // C++ [basic.stc.dynamic.deallocation]p2: 4836 // Each deallocation function shall return void and its first parameter 4837 // shall be void*. 4838 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4839 SemaRef.Context.VoidPtrTy, 4840 diag::err_operator_delete_dependent_param_type, 4841 diag::err_operator_delete_param_type)) 4842 return true; 4843 4844 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4845 if (FirstParamType->isDependentType()) 4846 return SemaRef.Diag(FnDecl->getLocation(), 4847 diag::err_operator_delete_dependent_param_type) 4848 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4849 4850 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4851 SemaRef.Context.VoidPtrTy) 4852 return SemaRef.Diag(FnDecl->getLocation(), 4853 diag::err_operator_delete_param_type) 4854 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4855 4856 return false; 4857} 4858 4859/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4860/// of this overloaded operator is well-formed. If so, returns false; 4861/// otherwise, emits appropriate diagnostics and returns true. 4862bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4863 assert(FnDecl && FnDecl->isOverloadedOperator() && 4864 "Expected an overloaded operator declaration"); 4865 4866 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4867 4868 // C++ [over.oper]p5: 4869 // The allocation and deallocation functions, operator new, 4870 // operator new[], operator delete and operator delete[], are 4871 // described completely in 3.7.3. The attributes and restrictions 4872 // found in the rest of this subclause do not apply to them unless 4873 // explicitly stated in 3.7.3. 4874 if (Op == OO_Delete || Op == OO_Array_Delete) 4875 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4876 4877 if (Op == OO_New || Op == OO_Array_New) 4878 return CheckOperatorNewDeclaration(*this, FnDecl); 4879 4880 // C++ [over.oper]p6: 4881 // An operator function shall either be a non-static member 4882 // function or be a non-member function and have at least one 4883 // parameter whose type is a class, a reference to a class, an 4884 // enumeration, or a reference to an enumeration. 4885 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4886 if (MethodDecl->isStatic()) 4887 return Diag(FnDecl->getLocation(), 4888 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4889 } else { 4890 bool ClassOrEnumParam = false; 4891 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4892 ParamEnd = FnDecl->param_end(); 4893 Param != ParamEnd; ++Param) { 4894 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4895 if (ParamType->isDependentType() || ParamType->isRecordType() || 4896 ParamType->isEnumeralType()) { 4897 ClassOrEnumParam = true; 4898 break; 4899 } 4900 } 4901 4902 if (!ClassOrEnumParam) 4903 return Diag(FnDecl->getLocation(), 4904 diag::err_operator_overload_needs_class_or_enum) 4905 << FnDecl->getDeclName(); 4906 } 4907 4908 // C++ [over.oper]p8: 4909 // An operator function cannot have default arguments (8.3.6), 4910 // except where explicitly stated below. 4911 // 4912 // Only the function-call operator allows default arguments 4913 // (C++ [over.call]p1). 4914 if (Op != OO_Call) { 4915 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4916 Param != FnDecl->param_end(); ++Param) { 4917 if ((*Param)->hasDefaultArg()) 4918 return Diag((*Param)->getLocation(), 4919 diag::err_operator_overload_default_arg) 4920 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4921 } 4922 } 4923 4924 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4925 { false, false, false } 4926#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4927 , { Unary, Binary, MemberOnly } 4928#include "clang/Basic/OperatorKinds.def" 4929 }; 4930 4931 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4932 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4933 bool MustBeMemberOperator = OperatorUses[Op][2]; 4934 4935 // C++ [over.oper]p8: 4936 // [...] Operator functions cannot have more or fewer parameters 4937 // than the number required for the corresponding operator, as 4938 // described in the rest of this subclause. 4939 unsigned NumParams = FnDecl->getNumParams() 4940 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4941 if (Op != OO_Call && 4942 ((NumParams == 1 && !CanBeUnaryOperator) || 4943 (NumParams == 2 && !CanBeBinaryOperator) || 4944 (NumParams < 1) || (NumParams > 2))) { 4945 // We have the wrong number of parameters. 4946 unsigned ErrorKind; 4947 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4948 ErrorKind = 2; // 2 -> unary or binary. 4949 } else if (CanBeUnaryOperator) { 4950 ErrorKind = 0; // 0 -> unary 4951 } else { 4952 assert(CanBeBinaryOperator && 4953 "All non-call overloaded operators are unary or binary!"); 4954 ErrorKind = 1; // 1 -> binary 4955 } 4956 4957 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4958 << FnDecl->getDeclName() << NumParams << ErrorKind; 4959 } 4960 4961 // Overloaded operators other than operator() cannot be variadic. 4962 if (Op != OO_Call && 4963 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4964 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4965 << FnDecl->getDeclName(); 4966 } 4967 4968 // Some operators must be non-static member functions. 4969 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4970 return Diag(FnDecl->getLocation(), 4971 diag::err_operator_overload_must_be_member) 4972 << FnDecl->getDeclName(); 4973 } 4974 4975 // C++ [over.inc]p1: 4976 // The user-defined function called operator++ implements the 4977 // prefix and postfix ++ operator. If this function is a member 4978 // function with no parameters, or a non-member function with one 4979 // parameter of class or enumeration type, it defines the prefix 4980 // increment operator ++ for objects of that type. If the function 4981 // is a member function with one parameter (which shall be of type 4982 // int) or a non-member function with two parameters (the second 4983 // of which shall be of type int), it defines the postfix 4984 // increment operator ++ for objects of that type. 4985 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4986 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4987 bool ParamIsInt = false; 4988 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4989 ParamIsInt = BT->getKind() == BuiltinType::Int; 4990 4991 if (!ParamIsInt) 4992 return Diag(LastParam->getLocation(), 4993 diag::err_operator_overload_post_incdec_must_be_int) 4994 << LastParam->getType() << (Op == OO_MinusMinus); 4995 } 4996 4997 // Notify the class if it got an assignment operator. 4998 if (Op == OO_Equal) { 4999 // Would have returned earlier otherwise. 5000 assert(isa<CXXMethodDecl>(FnDecl) && 5001 "Overloaded = not member, but not filtered."); 5002 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5003 Method->getParent()->addedAssignmentOperator(Context, Method); 5004 } 5005 5006 return false; 5007} 5008 5009/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5010/// linkage specification, including the language and (if present) 5011/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5012/// the location of the language string literal, which is provided 5013/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5014/// the '{' brace. Otherwise, this linkage specification does not 5015/// have any braces. 5016Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5017 SourceLocation ExternLoc, 5018 SourceLocation LangLoc, 5019 const char *Lang, 5020 unsigned StrSize, 5021 SourceLocation LBraceLoc) { 5022 LinkageSpecDecl::LanguageIDs Language; 5023 if (strncmp(Lang, "\"C\"", StrSize) == 0) 5024 Language = LinkageSpecDecl::lang_c; 5025 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 5026 Language = LinkageSpecDecl::lang_cxx; 5027 else { 5028 Diag(LangLoc, diag::err_bad_language); 5029 return DeclPtrTy(); 5030 } 5031 5032 // FIXME: Add all the various semantics of linkage specifications 5033 5034 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5035 LangLoc, Language, 5036 LBraceLoc.isValid()); 5037 CurContext->addDecl(D); 5038 PushDeclContext(S, D); 5039 return DeclPtrTy::make(D); 5040} 5041 5042/// ActOnFinishLinkageSpecification - Completely the definition of 5043/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5044/// valid, it's the position of the closing '}' brace in a linkage 5045/// specification that uses braces. 5046Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5047 DeclPtrTy LinkageSpec, 5048 SourceLocation RBraceLoc) { 5049 if (LinkageSpec) 5050 PopDeclContext(); 5051 return LinkageSpec; 5052} 5053 5054/// \brief Perform semantic analysis for the variable declaration that 5055/// occurs within a C++ catch clause, returning the newly-created 5056/// variable. 5057VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5058 TypeSourceInfo *TInfo, 5059 IdentifierInfo *Name, 5060 SourceLocation Loc, 5061 SourceRange Range) { 5062 bool Invalid = false; 5063 5064 // Arrays and functions decay. 5065 if (ExDeclType->isArrayType()) 5066 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5067 else if (ExDeclType->isFunctionType()) 5068 ExDeclType = Context.getPointerType(ExDeclType); 5069 5070 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5071 // The exception-declaration shall not denote a pointer or reference to an 5072 // incomplete type, other than [cv] void*. 5073 // N2844 forbids rvalue references. 5074 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5075 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5076 Invalid = true; 5077 } 5078 5079 QualType BaseType = ExDeclType; 5080 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5081 unsigned DK = diag::err_catch_incomplete; 5082 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5083 BaseType = Ptr->getPointeeType(); 5084 Mode = 1; 5085 DK = diag::err_catch_incomplete_ptr; 5086 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5087 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5088 BaseType = Ref->getPointeeType(); 5089 Mode = 2; 5090 DK = diag::err_catch_incomplete_ref; 5091 } 5092 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5093 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 5094 Invalid = true; 5095 5096 if (!Invalid && !ExDeclType->isDependentType() && 5097 RequireNonAbstractType(Loc, ExDeclType, 5098 diag::err_abstract_type_in_decl, 5099 AbstractVariableType)) 5100 Invalid = true; 5101 5102 // FIXME: Need to test for ability to copy-construct and destroy the 5103 // exception variable. 5104 5105 // FIXME: Need to check for abstract classes. 5106 5107 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5108 Name, ExDeclType, TInfo, VarDecl::None); 5109 5110 if (Invalid) 5111 ExDecl->setInvalidDecl(); 5112 5113 return ExDecl; 5114} 5115 5116/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5117/// handler. 5118Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5119 TypeSourceInfo *TInfo = 0; 5120 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5121 5122 bool Invalid = D.isInvalidType(); 5123 IdentifierInfo *II = D.getIdentifier(); 5124 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 5125 // The scope should be freshly made just for us. There is just no way 5126 // it contains any previous declaration. 5127 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5128 if (PrevDecl->isTemplateParameter()) { 5129 // Maybe we will complain about the shadowed template parameter. 5130 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5131 } 5132 } 5133 5134 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5135 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5136 << D.getCXXScopeSpec().getRange(); 5137 Invalid = true; 5138 } 5139 5140 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5141 D.getIdentifier(), 5142 D.getIdentifierLoc(), 5143 D.getDeclSpec().getSourceRange()); 5144 5145 if (Invalid) 5146 ExDecl->setInvalidDecl(); 5147 5148 // Add the exception declaration into this scope. 5149 if (II) 5150 PushOnScopeChains(ExDecl, S); 5151 else 5152 CurContext->addDecl(ExDecl); 5153 5154 ProcessDeclAttributes(S, ExDecl, D); 5155 return DeclPtrTy::make(ExDecl); 5156} 5157 5158Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5159 ExprArg assertexpr, 5160 ExprArg assertmessageexpr) { 5161 Expr *AssertExpr = (Expr *)assertexpr.get(); 5162 StringLiteral *AssertMessage = 5163 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5164 5165 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5166 llvm::APSInt Value(32); 5167 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5168 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5169 AssertExpr->getSourceRange(); 5170 return DeclPtrTy(); 5171 } 5172 5173 if (Value == 0) { 5174 Diag(AssertLoc, diag::err_static_assert_failed) 5175 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5176 } 5177 } 5178 5179 assertexpr.release(); 5180 assertmessageexpr.release(); 5181 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5182 AssertExpr, AssertMessage); 5183 5184 CurContext->addDecl(Decl); 5185 return DeclPtrTy::make(Decl); 5186} 5187 5188/// Handle a friend type declaration. This works in tandem with 5189/// ActOnTag. 5190/// 5191/// Notes on friend class templates: 5192/// 5193/// We generally treat friend class declarations as if they were 5194/// declaring a class. So, for example, the elaborated type specifier 5195/// in a friend declaration is required to obey the restrictions of a 5196/// class-head (i.e. no typedefs in the scope chain), template 5197/// parameters are required to match up with simple template-ids, &c. 5198/// However, unlike when declaring a template specialization, it's 5199/// okay to refer to a template specialization without an empty 5200/// template parameter declaration, e.g. 5201/// friend class A<T>::B<unsigned>; 5202/// We permit this as a special case; if there are any template 5203/// parameters present at all, require proper matching, i.e. 5204/// template <> template <class T> friend class A<int>::B; 5205Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5206 MultiTemplateParamsArg TempParams) { 5207 SourceLocation Loc = DS.getSourceRange().getBegin(); 5208 5209 assert(DS.isFriendSpecified()); 5210 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5211 5212 // Try to convert the decl specifier to a type. This works for 5213 // friend templates because ActOnTag never produces a ClassTemplateDecl 5214 // for a TUK_Friend. 5215 Declarator TheDeclarator(DS, Declarator::MemberContext); 5216 QualType T = GetTypeForDeclarator(TheDeclarator, S); 5217 if (TheDeclarator.isInvalidType()) 5218 return DeclPtrTy(); 5219 5220 // This is definitely an error in C++98. It's probably meant to 5221 // be forbidden in C++0x, too, but the specification is just 5222 // poorly written. 5223 // 5224 // The problem is with declarations like the following: 5225 // template <T> friend A<T>::foo; 5226 // where deciding whether a class C is a friend or not now hinges 5227 // on whether there exists an instantiation of A that causes 5228 // 'foo' to equal C. There are restrictions on class-heads 5229 // (which we declare (by fiat) elaborated friend declarations to 5230 // be) that makes this tractable. 5231 // 5232 // FIXME: handle "template <> friend class A<T>;", which 5233 // is possibly well-formed? Who even knows? 5234 if (TempParams.size() && !isa<ElaboratedType>(T)) { 5235 Diag(Loc, diag::err_tagless_friend_type_template) 5236 << DS.getSourceRange(); 5237 return DeclPtrTy(); 5238 } 5239 5240 // C++ [class.friend]p2: 5241 // An elaborated-type-specifier shall be used in a friend declaration 5242 // for a class.* 5243 // * The class-key of the elaborated-type-specifier is required. 5244 // This is one of the rare places in Clang where it's legitimate to 5245 // ask about the "spelling" of the type. 5246 if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) { 5247 // If we evaluated the type to a record type, suggest putting 5248 // a tag in front. 5249 if (const RecordType *RT = T->getAs<RecordType>()) { 5250 RecordDecl *RD = RT->getDecl(); 5251 5252 std::string InsertionText = std::string(" ") + RD->getKindName(); 5253 5254 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 5255 << (unsigned) RD->getTagKind() 5256 << T 5257 << SourceRange(DS.getFriendSpecLoc()) 5258 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 5259 InsertionText); 5260 return DeclPtrTy(); 5261 }else { 5262 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 5263 << DS.getSourceRange(); 5264 return DeclPtrTy(); 5265 } 5266 } 5267 5268 // Enum types cannot be friends. 5269 if (T->getAs<EnumType>()) { 5270 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 5271 << SourceRange(DS.getFriendSpecLoc()); 5272 return DeclPtrTy(); 5273 } 5274 5275 // C++98 [class.friend]p1: A friend of a class is a function 5276 // or class that is not a member of the class . . . 5277 // This is fixed in DR77, which just barely didn't make the C++03 5278 // deadline. It's also a very silly restriction that seriously 5279 // affects inner classes and which nobody else seems to implement; 5280 // thus we never diagnose it, not even in -pedantic. 5281 5282 Decl *D; 5283 if (TempParams.size()) 5284 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5285 TempParams.size(), 5286 (TemplateParameterList**) TempParams.release(), 5287 T.getTypePtr(), 5288 DS.getFriendSpecLoc()); 5289 else 5290 D = FriendDecl::Create(Context, CurContext, Loc, T.getTypePtr(), 5291 DS.getFriendSpecLoc()); 5292 D->setAccess(AS_public); 5293 CurContext->addDecl(D); 5294 5295 return DeclPtrTy::make(D); 5296} 5297 5298Sema::DeclPtrTy 5299Sema::ActOnFriendFunctionDecl(Scope *S, 5300 Declarator &D, 5301 bool IsDefinition, 5302 MultiTemplateParamsArg TemplateParams) { 5303 const DeclSpec &DS = D.getDeclSpec(); 5304 5305 assert(DS.isFriendSpecified()); 5306 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5307 5308 SourceLocation Loc = D.getIdentifierLoc(); 5309 TypeSourceInfo *TInfo = 0; 5310 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5311 5312 // C++ [class.friend]p1 5313 // A friend of a class is a function or class.... 5314 // Note that this sees through typedefs, which is intended. 5315 // It *doesn't* see through dependent types, which is correct 5316 // according to [temp.arg.type]p3: 5317 // If a declaration acquires a function type through a 5318 // type dependent on a template-parameter and this causes 5319 // a declaration that does not use the syntactic form of a 5320 // function declarator to have a function type, the program 5321 // is ill-formed. 5322 if (!T->isFunctionType()) { 5323 Diag(Loc, diag::err_unexpected_friend); 5324 5325 // It might be worthwhile to try to recover by creating an 5326 // appropriate declaration. 5327 return DeclPtrTy(); 5328 } 5329 5330 // C++ [namespace.memdef]p3 5331 // - If a friend declaration in a non-local class first declares a 5332 // class or function, the friend class or function is a member 5333 // of the innermost enclosing namespace. 5334 // - The name of the friend is not found by simple name lookup 5335 // until a matching declaration is provided in that namespace 5336 // scope (either before or after the class declaration granting 5337 // friendship). 5338 // - If a friend function is called, its name may be found by the 5339 // name lookup that considers functions from namespaces and 5340 // classes associated with the types of the function arguments. 5341 // - When looking for a prior declaration of a class or a function 5342 // declared as a friend, scopes outside the innermost enclosing 5343 // namespace scope are not considered. 5344 5345 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5346 DeclarationName Name = GetNameForDeclarator(D); 5347 assert(Name); 5348 5349 // The context we found the declaration in, or in which we should 5350 // create the declaration. 5351 DeclContext *DC; 5352 5353 // FIXME: handle local classes 5354 5355 // Recover from invalid scope qualifiers as if they just weren't there. 5356 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5357 ForRedeclaration); 5358 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5359 // FIXME: RequireCompleteDeclContext 5360 DC = computeDeclContext(ScopeQual); 5361 5362 // FIXME: handle dependent contexts 5363 if (!DC) return DeclPtrTy(); 5364 5365 LookupQualifiedName(Previous, DC); 5366 5367 // If searching in that context implicitly found a declaration in 5368 // a different context, treat it like it wasn't found at all. 5369 // TODO: better diagnostics for this case. Suggesting the right 5370 // qualified scope would be nice... 5371 // FIXME: getRepresentativeDecl() is not right here at all 5372 if (Previous.empty() || 5373 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5374 D.setInvalidType(); 5375 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5376 return DeclPtrTy(); 5377 } 5378 5379 // C++ [class.friend]p1: A friend of a class is a function or 5380 // class that is not a member of the class . . . 5381 if (DC->Equals(CurContext)) 5382 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5383 5384 // Otherwise walk out to the nearest namespace scope looking for matches. 5385 } else { 5386 // TODO: handle local class contexts. 5387 5388 DC = CurContext; 5389 while (true) { 5390 // Skip class contexts. If someone can cite chapter and verse 5391 // for this behavior, that would be nice --- it's what GCC and 5392 // EDG do, and it seems like a reasonable intent, but the spec 5393 // really only says that checks for unqualified existing 5394 // declarations should stop at the nearest enclosing namespace, 5395 // not that they should only consider the nearest enclosing 5396 // namespace. 5397 while (DC->isRecord()) 5398 DC = DC->getParent(); 5399 5400 LookupQualifiedName(Previous, DC); 5401 5402 // TODO: decide what we think about using declarations. 5403 if (!Previous.empty()) 5404 break; 5405 5406 if (DC->isFileContext()) break; 5407 DC = DC->getParent(); 5408 } 5409 5410 // C++ [class.friend]p1: A friend of a class is a function or 5411 // class that is not a member of the class . . . 5412 // C++0x changes this for both friend types and functions. 5413 // Most C++ 98 compilers do seem to give an error here, so 5414 // we do, too. 5415 if (!Previous.empty() && DC->Equals(CurContext) 5416 && !getLangOptions().CPlusPlus0x) 5417 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5418 } 5419 5420 if (DC->isFileContext()) { 5421 // This implies that it has to be an operator or function. 5422 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5423 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5424 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5425 Diag(Loc, diag::err_introducing_special_friend) << 5426 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5427 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5428 return DeclPtrTy(); 5429 } 5430 } 5431 5432 bool Redeclaration = false; 5433 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5434 move(TemplateParams), 5435 IsDefinition, 5436 Redeclaration); 5437 if (!ND) return DeclPtrTy(); 5438 5439 assert(ND->getDeclContext() == DC); 5440 assert(ND->getLexicalDeclContext() == CurContext); 5441 5442 // Add the function declaration to the appropriate lookup tables, 5443 // adjusting the redeclarations list as necessary. We don't 5444 // want to do this yet if the friending class is dependent. 5445 // 5446 // Also update the scope-based lookup if the target context's 5447 // lookup context is in lexical scope. 5448 if (!CurContext->isDependentContext()) { 5449 DC = DC->getLookupContext(); 5450 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5451 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5452 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5453 } 5454 5455 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5456 D.getIdentifierLoc(), ND, 5457 DS.getFriendSpecLoc()); 5458 FrD->setAccess(AS_public); 5459 CurContext->addDecl(FrD); 5460 5461 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) 5462 FrD->setSpecialization(true); 5463 5464 return DeclPtrTy::make(ND); 5465} 5466 5467void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5468 AdjustDeclIfTemplate(dcl); 5469 5470 Decl *Dcl = dcl.getAs<Decl>(); 5471 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5472 if (!Fn) { 5473 Diag(DelLoc, diag::err_deleted_non_function); 5474 return; 5475 } 5476 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5477 Diag(DelLoc, diag::err_deleted_decl_not_first); 5478 Diag(Prev->getLocation(), diag::note_previous_declaration); 5479 // If the declaration wasn't the first, we delete the function anyway for 5480 // recovery. 5481 } 5482 Fn->setDeleted(); 5483} 5484 5485static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5486 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5487 ++CI) { 5488 Stmt *SubStmt = *CI; 5489 if (!SubStmt) 5490 continue; 5491 if (isa<ReturnStmt>(SubStmt)) 5492 Self.Diag(SubStmt->getSourceRange().getBegin(), 5493 diag::err_return_in_constructor_handler); 5494 if (!isa<Expr>(SubStmt)) 5495 SearchForReturnInStmt(Self, SubStmt); 5496 } 5497} 5498 5499void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5500 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5501 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5502 SearchForReturnInStmt(*this, Handler); 5503 } 5504} 5505 5506bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5507 const CXXMethodDecl *Old) { 5508 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5509 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5510 5511 QualType CNewTy = Context.getCanonicalType(NewTy); 5512 QualType COldTy = Context.getCanonicalType(OldTy); 5513 5514 if (CNewTy == COldTy && 5515 CNewTy.getLocalCVRQualifiers() == COldTy.getLocalCVRQualifiers()) 5516 return false; 5517 5518 // Check if the return types are covariant 5519 QualType NewClassTy, OldClassTy; 5520 5521 /// Both types must be pointers or references to classes. 5522 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 5523 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 5524 NewClassTy = NewPT->getPointeeType(); 5525 OldClassTy = OldPT->getPointeeType(); 5526 } 5527 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 5528 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 5529 NewClassTy = NewRT->getPointeeType(); 5530 OldClassTy = OldRT->getPointeeType(); 5531 } 5532 } 5533 5534 // The return types aren't either both pointers or references to a class type. 5535 if (NewClassTy.isNull()) { 5536 Diag(New->getLocation(), 5537 diag::err_different_return_type_for_overriding_virtual_function) 5538 << New->getDeclName() << NewTy << OldTy; 5539 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5540 5541 return true; 5542 } 5543 5544 // C++ [class.virtual]p6: 5545 // If the return type of D::f differs from the return type of B::f, the 5546 // class type in the return type of D::f shall be complete at the point of 5547 // declaration of D::f or shall be the class type D. 5548 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5549 if (!RT->isBeingDefined() && 5550 RequireCompleteType(New->getLocation(), NewClassTy, 5551 PDiag(diag::err_covariant_return_incomplete) 5552 << New->getDeclName())) 5553 return true; 5554 } 5555 5556 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5557 // Check if the new class derives from the old class. 5558 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5559 Diag(New->getLocation(), 5560 diag::err_covariant_return_not_derived) 5561 << New->getDeclName() << NewTy << OldTy; 5562 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5563 return true; 5564 } 5565 5566 // Check if we the conversion from derived to base is valid. 5567 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5568 diag::err_covariant_return_inaccessible_base, 5569 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5570 // FIXME: Should this point to the return type? 5571 New->getLocation(), SourceRange(), New->getDeclName())) { 5572 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5573 return true; 5574 } 5575 } 5576 5577 // The qualifiers of the return types must be the same. 5578 if (CNewTy.getLocalCVRQualifiers() != COldTy.getLocalCVRQualifiers()) { 5579 Diag(New->getLocation(), 5580 diag::err_covariant_return_type_different_qualifications) 5581 << New->getDeclName() << NewTy << OldTy; 5582 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5583 return true; 5584 }; 5585 5586 5587 // The new class type must have the same or less qualifiers as the old type. 5588 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5589 Diag(New->getLocation(), 5590 diag::err_covariant_return_type_class_type_more_qualified) 5591 << New->getDeclName() << NewTy << OldTy; 5592 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5593 return true; 5594 }; 5595 5596 return false; 5597} 5598 5599bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5600 const CXXMethodDecl *Old) 5601{ 5602 if (Old->hasAttr<FinalAttr>()) { 5603 Diag(New->getLocation(), diag::err_final_function_overridden) 5604 << New->getDeclName(); 5605 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5606 return true; 5607 } 5608 5609 return false; 5610} 5611 5612/// \brief Mark the given method pure. 5613/// 5614/// \param Method the method to be marked pure. 5615/// 5616/// \param InitRange the source range that covers the "0" initializer. 5617bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5618 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5619 Method->setPure(); 5620 5621 // A class is abstract if at least one function is pure virtual. 5622 Method->getParent()->setAbstract(true); 5623 return false; 5624 } 5625 5626 if (!Method->isInvalidDecl()) 5627 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5628 << Method->getDeclName() << InitRange; 5629 return true; 5630} 5631 5632/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5633/// an initializer for the out-of-line declaration 'Dcl'. The scope 5634/// is a fresh scope pushed for just this purpose. 5635/// 5636/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5637/// static data member of class X, names should be looked up in the scope of 5638/// class X. 5639void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5640 // If there is no declaration, there was an error parsing it. 5641 Decl *D = Dcl.getAs<Decl>(); 5642 if (D == 0) return; 5643 5644 // We should only get called for declarations with scope specifiers, like: 5645 // int foo::bar; 5646 assert(D->isOutOfLine()); 5647 EnterDeclaratorContext(S, D->getDeclContext()); 5648} 5649 5650/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5651/// initializer for the out-of-line declaration 'Dcl'. 5652void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5653 // If there is no declaration, there was an error parsing it. 5654 Decl *D = Dcl.getAs<Decl>(); 5655 if (D == 0) return; 5656 5657 assert(D->isOutOfLine()); 5658 ExitDeclaratorContext(S); 5659} 5660 5661/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5662/// C++ if/switch/while/for statement. 5663/// e.g: "if (int x = f()) {...}" 5664Action::DeclResult 5665Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5666 // C++ 6.4p2: 5667 // The declarator shall not specify a function or an array. 5668 // The type-specifier-seq shall not contain typedef and shall not declare a 5669 // new class or enumeration. 5670 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5671 "Parser allowed 'typedef' as storage class of condition decl."); 5672 5673 TypeSourceInfo *TInfo = 0; 5674 TagDecl *OwnedTag = 0; 5675 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5676 5677 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5678 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5679 // would be created and CXXConditionDeclExpr wants a VarDecl. 5680 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5681 << D.getSourceRange(); 5682 return DeclResult(); 5683 } else if (OwnedTag && OwnedTag->isDefinition()) { 5684 // The type-specifier-seq shall not declare a new class or enumeration. 5685 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5686 } 5687 5688 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5689 if (!Dcl) 5690 return DeclResult(); 5691 5692 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5693 VD->setDeclaredInCondition(true); 5694 return Dcl; 5695} 5696 5697void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5698 CXXMethodDecl *MD) { 5699 // Ignore dependent types. 5700 if (MD->isDependentContext()) 5701 return; 5702 5703 CXXRecordDecl *RD = MD->getParent(); 5704 5705 // Ignore classes without a vtable. 5706 if (!RD->isDynamicClass()) 5707 return; 5708 5709 // Ignore declarations that are not definitions. 5710 if (!MD->isThisDeclarationADefinition()) 5711 return; 5712 5713 if (isa<CXXConstructorDecl>(MD)) { 5714 switch (MD->getParent()->getTemplateSpecializationKind()) { 5715 case TSK_Undeclared: 5716 case TSK_ExplicitSpecialization: 5717 // Classes that aren't instantiations of templates don't need their 5718 // virtual methods marked until we see the definition of the key 5719 // function. 5720 return; 5721 5722 case TSK_ImplicitInstantiation: 5723 case TSK_ExplicitInstantiationDeclaration: 5724 case TSK_ExplicitInstantiationDefinition: 5725 // This is a constructor of a class template; mark all of the virtual 5726 // members as referenced to ensure that they get instantiatied. 5727 break; 5728 } 5729 } else if (!MD->isOutOfLine()) { 5730 // Consider only out-of-line definitions of member functions. When we see 5731 // an inline definition, it's too early to compute the key function. 5732 return; 5733 } else if (const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD)) { 5734 // If this is not the key function, we don't need to mark virtual members. 5735 if (KeyFunction->getCanonicalDecl() != MD->getCanonicalDecl()) 5736 return; 5737 } else { 5738 // The class has no key function, so we've already noted that we need to 5739 // mark the virtual members of this class. 5740 return; 5741 } 5742 5743 // We will need to mark all of the virtual members as referenced to build the 5744 // vtable. 5745 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 5746} 5747 5748bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5749 if (ClassesWithUnmarkedVirtualMembers.empty()) 5750 return false; 5751 5752 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 5753 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 5754 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 5755 ClassesWithUnmarkedVirtualMembers.pop_back(); 5756 MarkVirtualMembersReferenced(Loc, RD); 5757 } 5758 5759 return true; 5760} 5761 5762void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, CXXRecordDecl *RD) { 5763 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5764 e = RD->method_end(); i != e; ++i) { 5765 CXXMethodDecl *MD = *i; 5766 5767 // C++ [basic.def.odr]p2: 5768 // [...] A virtual member function is used if it is not pure. [...] 5769 if (MD->isVirtual() && !MD->isPure()) 5770 MarkDeclarationReferenced(Loc, MD); 5771 } 5772} 5773 5774