SemaDeclCXX.cpp revision 202879
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 we knew where the '=' was, we could easily provide a fix-it 274 // hint here. Alternatively, we could walk the type-source information 275 // for NewParam to find the last source location in the type... but it 276 // isn't worth the effort right now. This is the kind of test case that 277 // is hard to get right: 278 279 // int f(int); 280 // void g(int (*fp)(int) = f); 281 // void g(int (*fp)(int) = &f); 282 Diag(NewParam->getLocation(), 283 diag::err_param_default_argument_redefinition) 284 << NewParam->getDefaultArgRange(); 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 (SS.isSet() && isDependentScopeSpecifier(SS)) { 1066 bool NotUnknownSpecialization = false; 1067 DeclContext *DC = computeDeclContext(SS, false); 1068 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1069 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1070 1071 if (!NotUnknownSpecialization) { 1072 // When the scope specifier can refer to a member of an unknown 1073 // specialization, we take it as a type name. 1074 BaseType = CheckTypenameType((NestedNameSpecifier *)SS.getScopeRep(), 1075 *MemberOrBase, SS.getRange()); 1076 R.clear(); 1077 } 1078 } 1079 1080 // If no results were found, try to correct typos. 1081 if (R.empty() && BaseType.isNull() && 1082 CorrectTypo(R, S, &SS, ClassDecl) && R.isSingleResult()) { 1083 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1084 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1085 // We have found a non-static data member with a similar 1086 // name to what was typed; complain and initialize that 1087 // member. 1088 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1089 << MemberOrBase << true << R.getLookupName() 1090 << CodeModificationHint::CreateReplacement(R.getNameLoc(), 1091 R.getLookupName().getAsString()); 1092 Diag(Member->getLocation(), diag::note_previous_decl) 1093 << Member->getDeclName(); 1094 1095 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1096 LParenLoc, RParenLoc); 1097 } 1098 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1099 const CXXBaseSpecifier *DirectBaseSpec; 1100 const CXXBaseSpecifier *VirtualBaseSpec; 1101 if (FindBaseInitializer(*this, ClassDecl, 1102 Context.getTypeDeclType(Type), 1103 DirectBaseSpec, VirtualBaseSpec)) { 1104 // We have found a direct or virtual base class with a 1105 // similar name to what was typed; complain and initialize 1106 // that base class. 1107 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1108 << MemberOrBase << false << R.getLookupName() 1109 << CodeModificationHint::CreateReplacement(R.getNameLoc(), 1110 R.getLookupName().getAsString()); 1111 1112 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1113 : VirtualBaseSpec; 1114 Diag(BaseSpec->getSourceRange().getBegin(), 1115 diag::note_base_class_specified_here) 1116 << BaseSpec->getType() 1117 << BaseSpec->getSourceRange(); 1118 1119 TyD = Type; 1120 } 1121 } 1122 } 1123 1124 if (!TyD && BaseType.isNull()) { 1125 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1126 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1127 return true; 1128 } 1129 } 1130 1131 if (BaseType.isNull()) { 1132 BaseType = Context.getTypeDeclType(TyD); 1133 if (SS.isSet()) { 1134 NestedNameSpecifier *Qualifier = 1135 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1136 1137 // FIXME: preserve source range information 1138 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1139 } 1140 } 1141 } 1142 1143 if (!TInfo) 1144 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1145 1146 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1147 LParenLoc, RParenLoc, ClassDecl); 1148} 1149 1150/// Checks an initializer expression for use of uninitialized fields, such as 1151/// containing the field that is being initialized. Returns true if there is an 1152/// uninitialized field was used an updates the SourceLocation parameter; false 1153/// otherwise. 1154static bool InitExprContainsUninitializedFields(const Stmt* S, 1155 const FieldDecl* LhsField, 1156 SourceLocation* L) { 1157 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1158 if (ME) { 1159 const NamedDecl* RhsField = ME->getMemberDecl(); 1160 if (RhsField == LhsField) { 1161 // Initializing a field with itself. Throw a warning. 1162 // But wait; there are exceptions! 1163 // Exception #1: The field may not belong to this record. 1164 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1165 const Expr* base = ME->getBase(); 1166 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1167 // Even though the field matches, it does not belong to this record. 1168 return false; 1169 } 1170 // None of the exceptions triggered; return true to indicate an 1171 // uninitialized field was used. 1172 *L = ME->getMemberLoc(); 1173 return true; 1174 } 1175 } 1176 bool found = false; 1177 for (Stmt::const_child_iterator it = S->child_begin(); 1178 it != S->child_end() && found == false; 1179 ++it) { 1180 if (isa<CallExpr>(S)) { 1181 // Do not descend into function calls or constructors, as the use 1182 // of an uninitialized field may be valid. One would have to inspect 1183 // the contents of the function/ctor to determine if it is safe or not. 1184 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1185 // may be safe, depending on what the function/ctor does. 1186 continue; 1187 } 1188 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1189 } 1190 return found; 1191} 1192 1193Sema::MemInitResult 1194Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1195 unsigned NumArgs, SourceLocation IdLoc, 1196 SourceLocation LParenLoc, 1197 SourceLocation RParenLoc) { 1198 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1199 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1200 ExprTemporaries.clear(); 1201 1202 // Diagnose value-uses of fields to initialize themselves, e.g. 1203 // foo(foo) 1204 // where foo is not also a parameter to the constructor. 1205 // TODO: implement -Wuninitialized and fold this into that framework. 1206 for (unsigned i = 0; i < NumArgs; ++i) { 1207 SourceLocation L; 1208 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1209 // FIXME: Return true in the case when other fields are used before being 1210 // uninitialized. For example, let this field be the i'th field. When 1211 // initializing the i'th field, throw a warning if any of the >= i'th 1212 // fields are used, as they are not yet initialized. 1213 // Right now we are only handling the case where the i'th field uses 1214 // itself in its initializer. 1215 Diag(L, diag::warn_field_is_uninit); 1216 } 1217 } 1218 1219 bool HasDependentArg = false; 1220 for (unsigned i = 0; i < NumArgs; i++) 1221 HasDependentArg |= Args[i]->isTypeDependent(); 1222 1223 CXXConstructorDecl *C = 0; 1224 QualType FieldType = Member->getType(); 1225 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1226 FieldType = Array->getElementType(); 1227 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1228 if (FieldType->isDependentType()) { 1229 // Can't check init for dependent type. 1230 } else if (FieldType->isRecordType()) { 1231 // Member is a record (struct/union/class), so pass the initializer 1232 // arguments down to the record's constructor. 1233 if (!HasDependentArg) { 1234 C = PerformInitializationByConstructor(FieldType, 1235 MultiExprArg(*this, 1236 (void**)Args, 1237 NumArgs), 1238 IdLoc, 1239 SourceRange(IdLoc, RParenLoc), 1240 Member->getDeclName(), 1241 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc), 1242 ConstructorArgs); 1243 1244 if (C) { 1245 // Take over the constructor arguments as our own. 1246 NumArgs = ConstructorArgs.size(); 1247 Args = (Expr **)ConstructorArgs.take(); 1248 } 1249 } 1250 } else if (NumArgs != 1 && NumArgs != 0) { 1251 // The member type is not a record type (or an array of record 1252 // types), so it can be only be default- or copy-initialized. 1253 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 1254 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 1255 } else if (!HasDependentArg) { 1256 Expr *NewExp; 1257 if (NumArgs == 0) { 1258 if (FieldType->isReferenceType()) { 1259 Diag(IdLoc, diag::err_null_intialized_reference_member) 1260 << Member->getDeclName(); 1261 return Diag(Member->getLocation(), diag::note_declared_at); 1262 } 1263 NewExp = new (Context) CXXZeroInitValueExpr(FieldType, IdLoc, RParenLoc); 1264 NumArgs = 1; 1265 } 1266 else 1267 NewExp = (Expr*)Args[0]; 1268 if (!Member->isInvalidDecl() && 1269 PerformCopyInitialization(NewExp, FieldType, AA_Passing)) 1270 return true; 1271 Args[0] = NewExp; 1272 } 1273 1274 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1275 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1276 ExprTemporaries.clear(); 1277 1278 // FIXME: Perform direct initialization of the member. 1279 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1280 C, LParenLoc, (Expr **)Args, 1281 NumArgs, RParenLoc); 1282} 1283 1284Sema::MemInitResult 1285Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1286 Expr **Args, unsigned NumArgs, 1287 SourceLocation LParenLoc, SourceLocation RParenLoc, 1288 CXXRecordDecl *ClassDecl) { 1289 bool HasDependentArg = false; 1290 for (unsigned i = 0; i < NumArgs; i++) 1291 HasDependentArg |= Args[i]->isTypeDependent(); 1292 1293 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1294 if (!BaseType->isDependentType()) { 1295 if (!BaseType->isRecordType()) 1296 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1297 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1298 1299 // C++ [class.base.init]p2: 1300 // [...] Unless the mem-initializer-id names a nonstatic data 1301 // member of the constructor���s class or a direct or virtual base 1302 // of that class, the mem-initializer is ill-formed. A 1303 // mem-initializer-list can initialize a base class using any 1304 // name that denotes that base class type. 1305 1306 // Check for direct and virtual base classes. 1307 const CXXBaseSpecifier *DirectBaseSpec = 0; 1308 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1309 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1310 VirtualBaseSpec); 1311 1312 // C++ [base.class.init]p2: 1313 // If a mem-initializer-id is ambiguous because it designates both 1314 // a direct non-virtual base class and an inherited virtual base 1315 // class, the mem-initializer is ill-formed. 1316 if (DirectBaseSpec && VirtualBaseSpec) 1317 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1318 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1319 // C++ [base.class.init]p2: 1320 // Unless the mem-initializer-id names a nonstatic data membeer of the 1321 // constructor's class ot a direst or virtual base of that class, the 1322 // mem-initializer is ill-formed. 1323 if (!DirectBaseSpec && !VirtualBaseSpec) 1324 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1325 << BaseType << ClassDecl->getNameAsCString() 1326 << BaseTInfo->getTypeLoc().getSourceRange(); 1327 } 1328 1329 CXXConstructorDecl *C = 0; 1330 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1331 if (!BaseType->isDependentType() && !HasDependentArg) { 1332 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 1333 Context.getCanonicalType(BaseType).getUnqualifiedType()); 1334 1335 C = PerformInitializationByConstructor(BaseType, 1336 MultiExprArg(*this, 1337 (void**)Args, NumArgs), 1338 BaseLoc, 1339 SourceRange(BaseLoc, RParenLoc), 1340 Name, 1341 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc), 1342 ConstructorArgs); 1343 if (C) { 1344 // Take over the constructor arguments as our own. 1345 NumArgs = ConstructorArgs.size(); 1346 Args = (Expr **)ConstructorArgs.take(); 1347 } 1348 } 1349 1350 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1351 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1352 ExprTemporaries.clear(); 1353 1354 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, C, 1355 LParenLoc, (Expr **)Args, 1356 NumArgs, RParenLoc); 1357} 1358 1359bool 1360Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1361 CXXBaseOrMemberInitializer **Initializers, 1362 unsigned NumInitializers, 1363 bool IsImplicitConstructor) { 1364 // We need to build the initializer AST according to order of construction 1365 // and not what user specified in the Initializers list. 1366 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1367 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1368 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1369 bool HasDependentBaseInit = false; 1370 bool HadError = false; 1371 1372 for (unsigned i = 0; i < NumInitializers; i++) { 1373 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1374 if (Member->isBaseInitializer()) { 1375 if (Member->getBaseClass()->isDependentType()) 1376 HasDependentBaseInit = true; 1377 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1378 } else { 1379 AllBaseFields[Member->getMember()] = Member; 1380 } 1381 } 1382 1383 if (HasDependentBaseInit) { 1384 // FIXME. This does not preserve the ordering of the initializers. 1385 // Try (with -Wreorder) 1386 // template<class X> struct A {}; 1387 // template<class X> struct B : A<X> { 1388 // B() : x1(10), A<X>() {} 1389 // int x1; 1390 // }; 1391 // B<int> x; 1392 // On seeing one dependent type, we should essentially exit this routine 1393 // while preserving user-declared initializer list. When this routine is 1394 // called during instantiatiation process, this routine will rebuild the 1395 // ordered initializer list correctly. 1396 1397 // If we have a dependent base initialization, we can't determine the 1398 // association between initializers and bases; just dump the known 1399 // initializers into the list, and don't try to deal with other bases. 1400 for (unsigned i = 0; i < NumInitializers; i++) { 1401 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1402 if (Member->isBaseInitializer()) 1403 AllToInit.push_back(Member); 1404 } 1405 } else { 1406 // Push virtual bases before others. 1407 for (CXXRecordDecl::base_class_iterator VBase = 1408 ClassDecl->vbases_begin(), 1409 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1410 if (VBase->getType()->isDependentType()) 1411 continue; 1412 if (CXXBaseOrMemberInitializer *Value 1413 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1414 AllToInit.push_back(Value); 1415 } 1416 else { 1417 CXXRecordDecl *VBaseDecl = 1418 cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1419 assert(VBaseDecl && "SetBaseOrMemberInitializers - VBaseDecl null"); 1420 CXXConstructorDecl *Ctor = VBaseDecl->getDefaultConstructor(Context); 1421 if (!Ctor) { 1422 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1423 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1424 << 0 << VBase->getType(); 1425 Diag(VBaseDecl->getLocation(), diag::note_previous_decl) 1426 << Context.getTagDeclType(VBaseDecl); 1427 HadError = true; 1428 continue; 1429 } 1430 1431 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1432 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1433 Constructor->getLocation(), CtorArgs)) 1434 continue; 1435 1436 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1437 1438 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1439 // subexpression so we can wrap it in a CXXExprWithTemporaries if 1440 // necessary. 1441 // FIXME: Is there any better source-location information we can give? 1442 ExprTemporaries.clear(); 1443 CXXBaseOrMemberInitializer *Member = 1444 new (Context) CXXBaseOrMemberInitializer(Context, 1445 Context.getTrivialTypeSourceInfo(VBase->getType(), 1446 SourceLocation()), 1447 Ctor, 1448 SourceLocation(), 1449 CtorArgs.takeAs<Expr>(), 1450 CtorArgs.size(), 1451 SourceLocation()); 1452 AllToInit.push_back(Member); 1453 } 1454 } 1455 1456 for (CXXRecordDecl::base_class_iterator Base = 1457 ClassDecl->bases_begin(), 1458 E = ClassDecl->bases_end(); Base != E; ++Base) { 1459 // Virtuals are in the virtual base list and already constructed. 1460 if (Base->isVirtual()) 1461 continue; 1462 // Skip dependent types. 1463 if (Base->getType()->isDependentType()) 1464 continue; 1465 if (CXXBaseOrMemberInitializer *Value 1466 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1467 AllToInit.push_back(Value); 1468 } 1469 else { 1470 CXXRecordDecl *BaseDecl = 1471 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1472 assert(BaseDecl && "SetBaseOrMemberInitializers - BaseDecl null"); 1473 CXXConstructorDecl *Ctor = BaseDecl->getDefaultConstructor(Context); 1474 if (!Ctor) { 1475 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1476 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1477 << 0 << Base->getType(); 1478 Diag(BaseDecl->getLocation(), diag::note_previous_decl) 1479 << Context.getTagDeclType(BaseDecl); 1480 HadError = true; 1481 continue; 1482 } 1483 1484 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1485 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1486 Constructor->getLocation(), CtorArgs)) 1487 continue; 1488 1489 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1490 1491 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1492 // subexpression so we can wrap it in a CXXExprWithTemporaries if 1493 // necessary. 1494 // FIXME: Is there any better source-location information we can give? 1495 ExprTemporaries.clear(); 1496 CXXBaseOrMemberInitializer *Member = 1497 new (Context) CXXBaseOrMemberInitializer(Context, 1498 Context.getTrivialTypeSourceInfo(Base->getType(), 1499 SourceLocation()), 1500 Ctor, 1501 SourceLocation(), 1502 CtorArgs.takeAs<Expr>(), 1503 CtorArgs.size(), 1504 SourceLocation()); 1505 AllToInit.push_back(Member); 1506 } 1507 } 1508 } 1509 1510 // non-static data members. 1511 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1512 E = ClassDecl->field_end(); Field != E; ++Field) { 1513 if ((*Field)->isAnonymousStructOrUnion()) { 1514 if (const RecordType *FieldClassType = 1515 Field->getType()->getAs<RecordType>()) { 1516 CXXRecordDecl *FieldClassDecl 1517 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1518 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1519 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1520 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1521 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1522 // set to the anonymous union data member used in the initializer 1523 // list. 1524 Value->setMember(*Field); 1525 Value->setAnonUnionMember(*FA); 1526 AllToInit.push_back(Value); 1527 break; 1528 } 1529 } 1530 } 1531 continue; 1532 } 1533 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1534 AllToInit.push_back(Value); 1535 continue; 1536 } 1537 1538 if ((*Field)->getType()->isDependentType()) 1539 continue; 1540 1541 QualType FT = Context.getBaseElementType((*Field)->getType()); 1542 if (const RecordType* RT = FT->getAs<RecordType>()) { 1543 CXXConstructorDecl *Ctor = 1544 cast<CXXRecordDecl>(RT->getDecl())->getDefaultConstructor(Context); 1545 if (!Ctor) { 1546 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1547 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1548 << 1 << (*Field)->getDeclName(); 1549 Diag(Field->getLocation(), diag::note_field_decl); 1550 Diag(RT->getDecl()->getLocation(), diag::note_previous_decl) 1551 << Context.getTagDeclType(RT->getDecl()); 1552 HadError = true; 1553 continue; 1554 } 1555 1556 if (FT.isConstQualified() && Ctor->isTrivial()) { 1557 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1558 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1559 << 1 << (*Field)->getDeclName(); 1560 Diag((*Field)->getLocation(), diag::note_declared_at); 1561 HadError = true; 1562 } 1563 1564 // Don't create initializers for trivial constructors, since they don't 1565 // actually need to be run. 1566 if (Ctor->isTrivial()) 1567 continue; 1568 1569 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1570 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1571 Constructor->getLocation(), CtorArgs)) 1572 continue; 1573 1574 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1575 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1576 ExprTemporaries.clear(); 1577 CXXBaseOrMemberInitializer *Member = 1578 new (Context) CXXBaseOrMemberInitializer(Context, 1579 *Field, SourceLocation(), 1580 Ctor, 1581 SourceLocation(), 1582 CtorArgs.takeAs<Expr>(), 1583 CtorArgs.size(), 1584 SourceLocation()); 1585 1586 AllToInit.push_back(Member); 1587 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1588 } 1589 else if (FT->isReferenceType()) { 1590 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1591 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1592 << 0 << (*Field)->getDeclName(); 1593 Diag((*Field)->getLocation(), diag::note_declared_at); 1594 HadError = true; 1595 } 1596 else if (FT.isConstQualified()) { 1597 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1598 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1599 << 1 << (*Field)->getDeclName(); 1600 Diag((*Field)->getLocation(), diag::note_declared_at); 1601 HadError = true; 1602 } 1603 } 1604 1605 NumInitializers = AllToInit.size(); 1606 if (NumInitializers > 0) { 1607 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1608 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1609 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1610 1611 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1612 for (unsigned Idx = 0; Idx < NumInitializers; ++Idx) 1613 baseOrMemberInitializers[Idx] = AllToInit[Idx]; 1614 } 1615 1616 return HadError; 1617} 1618 1619static void *GetKeyForTopLevelField(FieldDecl *Field) { 1620 // For anonymous unions, use the class declaration as the key. 1621 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1622 if (RT->getDecl()->isAnonymousStructOrUnion()) 1623 return static_cast<void *>(RT->getDecl()); 1624 } 1625 return static_cast<void *>(Field); 1626} 1627 1628static void *GetKeyForBase(QualType BaseType) { 1629 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1630 return (void *)RT; 1631 1632 assert(0 && "Unexpected base type!"); 1633 return 0; 1634} 1635 1636static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1637 bool MemberMaybeAnon = false) { 1638 // For fields injected into the class via declaration of an anonymous union, 1639 // use its anonymous union class declaration as the unique key. 1640 if (Member->isMemberInitializer()) { 1641 FieldDecl *Field = Member->getMember(); 1642 1643 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1644 // data member of the class. Data member used in the initializer list is 1645 // in AnonUnionMember field. 1646 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1647 Field = Member->getAnonUnionMember(); 1648 if (Field->getDeclContext()->isRecord()) { 1649 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 1650 if (RD->isAnonymousStructOrUnion()) 1651 return static_cast<void *>(RD); 1652 } 1653 return static_cast<void *>(Field); 1654 } 1655 1656 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1657} 1658 1659/// ActOnMemInitializers - Handle the member initializers for a constructor. 1660void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1661 SourceLocation ColonLoc, 1662 MemInitTy **MemInits, unsigned NumMemInits) { 1663 if (!ConstructorDecl) 1664 return; 1665 1666 AdjustDeclIfTemplate(ConstructorDecl); 1667 1668 CXXConstructorDecl *Constructor 1669 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1670 1671 if (!Constructor) { 1672 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1673 return; 1674 } 1675 1676 if (!Constructor->isDependentContext()) { 1677 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 1678 bool err = false; 1679 for (unsigned i = 0; i < NumMemInits; i++) { 1680 CXXBaseOrMemberInitializer *Member = 1681 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1682 void *KeyToMember = GetKeyForMember(Member); 1683 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1684 if (!PrevMember) { 1685 PrevMember = Member; 1686 continue; 1687 } 1688 if (FieldDecl *Field = Member->getMember()) 1689 Diag(Member->getSourceLocation(), 1690 diag::error_multiple_mem_initialization) 1691 << Field->getNameAsString() 1692 << Member->getSourceRange(); 1693 else { 1694 Type *BaseClass = Member->getBaseClass(); 1695 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1696 Diag(Member->getSourceLocation(), 1697 diag::error_multiple_base_initialization) 1698 << QualType(BaseClass, 0) 1699 << Member->getSourceRange(); 1700 } 1701 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1702 << 0; 1703 err = true; 1704 } 1705 1706 if (err) 1707 return; 1708 } 1709 1710 SetBaseOrMemberInitializers(Constructor, 1711 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 1712 NumMemInits, false); 1713 1714 if (Constructor->isDependentContext()) 1715 return; 1716 1717 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1718 Diagnostic::Ignored && 1719 Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1720 Diagnostic::Ignored) 1721 return; 1722 1723 // Also issue warning if order of ctor-initializer list does not match order 1724 // of 1) base class declarations and 2) order of non-static data members. 1725 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1726 1727 CXXRecordDecl *ClassDecl 1728 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1729 // Push virtual bases before others. 1730 for (CXXRecordDecl::base_class_iterator VBase = 1731 ClassDecl->vbases_begin(), 1732 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1733 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1734 1735 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1736 E = ClassDecl->bases_end(); Base != E; ++Base) { 1737 // Virtuals are alread in the virtual base list and are constructed 1738 // first. 1739 if (Base->isVirtual()) 1740 continue; 1741 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1742 } 1743 1744 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1745 E = ClassDecl->field_end(); Field != E; ++Field) 1746 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1747 1748 int Last = AllBaseOrMembers.size(); 1749 int curIndex = 0; 1750 CXXBaseOrMemberInitializer *PrevMember = 0; 1751 for (unsigned i = 0; i < NumMemInits; i++) { 1752 CXXBaseOrMemberInitializer *Member = 1753 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1754 void *MemberInCtorList = GetKeyForMember(Member, true); 1755 1756 for (; curIndex < Last; curIndex++) 1757 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1758 break; 1759 if (curIndex == Last) { 1760 assert(PrevMember && "Member not in member list?!"); 1761 // Initializer as specified in ctor-initializer list is out of order. 1762 // Issue a warning diagnostic. 1763 if (PrevMember->isBaseInitializer()) { 1764 // Diagnostics is for an initialized base class. 1765 Type *BaseClass = PrevMember->getBaseClass(); 1766 Diag(PrevMember->getSourceLocation(), 1767 diag::warn_base_initialized) 1768 << QualType(BaseClass, 0); 1769 } else { 1770 FieldDecl *Field = PrevMember->getMember(); 1771 Diag(PrevMember->getSourceLocation(), 1772 diag::warn_field_initialized) 1773 << Field->getNameAsString(); 1774 } 1775 // Also the note! 1776 if (FieldDecl *Field = Member->getMember()) 1777 Diag(Member->getSourceLocation(), 1778 diag::note_fieldorbase_initialized_here) << 0 1779 << Field->getNameAsString(); 1780 else { 1781 Type *BaseClass = Member->getBaseClass(); 1782 Diag(Member->getSourceLocation(), 1783 diag::note_fieldorbase_initialized_here) << 1 1784 << QualType(BaseClass, 0); 1785 } 1786 for (curIndex = 0; curIndex < Last; curIndex++) 1787 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1788 break; 1789 } 1790 PrevMember = Member; 1791 } 1792} 1793 1794void 1795Sema::MarkBaseAndMemberDestructorsReferenced(CXXDestructorDecl *Destructor) { 1796 // Ignore dependent destructors. 1797 if (Destructor->isDependentContext()) 1798 return; 1799 1800 CXXRecordDecl *ClassDecl = Destructor->getParent(); 1801 1802 // Non-static data members. 1803 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1804 E = ClassDecl->field_end(); I != E; ++I) { 1805 FieldDecl *Field = *I; 1806 1807 QualType FieldType = Context.getBaseElementType(Field->getType()); 1808 1809 const RecordType* RT = FieldType->getAs<RecordType>(); 1810 if (!RT) 1811 continue; 1812 1813 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1814 if (FieldClassDecl->hasTrivialDestructor()) 1815 continue; 1816 1817 const CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1818 MarkDeclarationReferenced(Destructor->getLocation(), 1819 const_cast<CXXDestructorDecl*>(Dtor)); 1820 } 1821 1822 // Bases. 1823 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1824 E = ClassDecl->bases_end(); Base != E; ++Base) { 1825 // Ignore virtual bases. 1826 if (Base->isVirtual()) 1827 continue; 1828 1829 // Ignore trivial destructors. 1830 CXXRecordDecl *BaseClassDecl 1831 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1832 if (BaseClassDecl->hasTrivialDestructor()) 1833 continue; 1834 1835 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1836 MarkDeclarationReferenced(Destructor->getLocation(), 1837 const_cast<CXXDestructorDecl*>(Dtor)); 1838 } 1839 1840 // Virtual bases. 1841 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1842 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1843 // Ignore trivial destructors. 1844 CXXRecordDecl *BaseClassDecl 1845 = cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1846 if (BaseClassDecl->hasTrivialDestructor()) 1847 continue; 1848 1849 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1850 MarkDeclarationReferenced(Destructor->getLocation(), 1851 const_cast<CXXDestructorDecl*>(Dtor)); 1852 } 1853} 1854 1855void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1856 if (!CDtorDecl) 1857 return; 1858 1859 AdjustDeclIfTemplate(CDtorDecl); 1860 1861 if (CXXConstructorDecl *Constructor 1862 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1863 SetBaseOrMemberInitializers(Constructor, 0, 0, false); 1864} 1865 1866namespace { 1867 /// PureVirtualMethodCollector - traverses a class and its superclasses 1868 /// and determines if it has any pure virtual methods. 1869 class PureVirtualMethodCollector { 1870 ASTContext &Context; 1871 1872 public: 1873 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1874 1875 private: 1876 MethodList Methods; 1877 1878 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1879 1880 public: 1881 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1882 : Context(Ctx) { 1883 1884 MethodList List; 1885 Collect(RD, List); 1886 1887 // Copy the temporary list to methods, and make sure to ignore any 1888 // null entries. 1889 for (size_t i = 0, e = List.size(); i != e; ++i) { 1890 if (List[i]) 1891 Methods.push_back(List[i]); 1892 } 1893 } 1894 1895 bool empty() const { return Methods.empty(); } 1896 1897 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1898 MethodList::const_iterator methods_end() { return Methods.end(); } 1899 }; 1900 1901 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1902 MethodList& Methods) { 1903 // First, collect the pure virtual methods for the base classes. 1904 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1905 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1906 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1907 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1908 if (BaseDecl && BaseDecl->isAbstract()) 1909 Collect(BaseDecl, Methods); 1910 } 1911 } 1912 1913 // Next, zero out any pure virtual methods that this class overrides. 1914 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1915 1916 MethodSetTy OverriddenMethods; 1917 size_t MethodsSize = Methods.size(); 1918 1919 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1920 i != e; ++i) { 1921 // Traverse the record, looking for methods. 1922 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1923 // If the method is pure virtual, add it to the methods vector. 1924 if (MD->isPure()) 1925 Methods.push_back(MD); 1926 1927 // Record all the overridden methods in our set. 1928 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1929 E = MD->end_overridden_methods(); I != E; ++I) { 1930 // Keep track of the overridden methods. 1931 OverriddenMethods.insert(*I); 1932 } 1933 } 1934 } 1935 1936 // Now go through the methods and zero out all the ones we know are 1937 // overridden. 1938 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1939 if (OverriddenMethods.count(Methods[i])) 1940 Methods[i] = 0; 1941 } 1942 1943 } 1944} 1945 1946 1947bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1948 unsigned DiagID, AbstractDiagSelID SelID, 1949 const CXXRecordDecl *CurrentRD) { 1950 if (SelID == -1) 1951 return RequireNonAbstractType(Loc, T, 1952 PDiag(DiagID), CurrentRD); 1953 else 1954 return RequireNonAbstractType(Loc, T, 1955 PDiag(DiagID) << SelID, CurrentRD); 1956} 1957 1958bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1959 const PartialDiagnostic &PD, 1960 const CXXRecordDecl *CurrentRD) { 1961 if (!getLangOptions().CPlusPlus) 1962 return false; 1963 1964 if (const ArrayType *AT = Context.getAsArrayType(T)) 1965 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 1966 CurrentRD); 1967 1968 if (const PointerType *PT = T->getAs<PointerType>()) { 1969 // Find the innermost pointer type. 1970 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1971 PT = T; 1972 1973 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1974 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 1975 } 1976 1977 const RecordType *RT = T->getAs<RecordType>(); 1978 if (!RT) 1979 return false; 1980 1981 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1982 if (!RD) 1983 return false; 1984 1985 if (CurrentRD && CurrentRD != RD) 1986 return false; 1987 1988 if (!RD->isAbstract()) 1989 return false; 1990 1991 Diag(Loc, PD) << RD->getDeclName(); 1992 1993 // Check if we've already emitted the list of pure virtual functions for this 1994 // class. 1995 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1996 return true; 1997 1998 PureVirtualMethodCollector Collector(Context, RD); 1999 2000 for (PureVirtualMethodCollector::MethodList::const_iterator I = 2001 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 2002 const CXXMethodDecl *MD = *I; 2003 2004 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 2005 MD->getDeclName(); 2006 } 2007 2008 if (!PureVirtualClassDiagSet) 2009 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2010 PureVirtualClassDiagSet->insert(RD); 2011 2012 return true; 2013} 2014 2015namespace { 2016 class AbstractClassUsageDiagnoser 2017 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2018 Sema &SemaRef; 2019 CXXRecordDecl *AbstractClass; 2020 2021 bool VisitDeclContext(const DeclContext *DC) { 2022 bool Invalid = false; 2023 2024 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2025 E = DC->decls_end(); I != E; ++I) 2026 Invalid |= Visit(*I); 2027 2028 return Invalid; 2029 } 2030 2031 public: 2032 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2033 : SemaRef(SemaRef), AbstractClass(ac) { 2034 Visit(SemaRef.Context.getTranslationUnitDecl()); 2035 } 2036 2037 bool VisitFunctionDecl(const FunctionDecl *FD) { 2038 if (FD->isThisDeclarationADefinition()) { 2039 // No need to do the check if we're in a definition, because it requires 2040 // that the return/param types are complete. 2041 // because that requires 2042 return VisitDeclContext(FD); 2043 } 2044 2045 // Check the return type. 2046 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2047 bool Invalid = 2048 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2049 diag::err_abstract_type_in_decl, 2050 Sema::AbstractReturnType, 2051 AbstractClass); 2052 2053 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2054 E = FD->param_end(); I != E; ++I) { 2055 const ParmVarDecl *VD = *I; 2056 Invalid |= 2057 SemaRef.RequireNonAbstractType(VD->getLocation(), 2058 VD->getOriginalType(), 2059 diag::err_abstract_type_in_decl, 2060 Sema::AbstractParamType, 2061 AbstractClass); 2062 } 2063 2064 return Invalid; 2065 } 2066 2067 bool VisitDecl(const Decl* D) { 2068 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2069 return VisitDeclContext(DC); 2070 2071 return false; 2072 } 2073 }; 2074} 2075 2076/// \brief Perform semantic checks on a class definition that has been 2077/// completing, introducing implicitly-declared members, checking for 2078/// abstract types, etc. 2079void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2080 if (!Record || Record->isInvalidDecl()) 2081 return; 2082 2083 if (!Record->isDependentType()) 2084 AddImplicitlyDeclaredMembersToClass(Record); 2085 2086 if (Record->isInvalidDecl()) 2087 return; 2088 2089 if (!Record->isAbstract()) { 2090 // Collect all the pure virtual methods and see if this is an abstract 2091 // class after all. 2092 PureVirtualMethodCollector Collector(Context, Record); 2093 if (!Collector.empty()) 2094 Record->setAbstract(true); 2095 } 2096 2097 if (Record->isAbstract()) 2098 (void)AbstractClassUsageDiagnoser(*this, Record); 2099} 2100 2101void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2102 DeclPtrTy TagDecl, 2103 SourceLocation LBrac, 2104 SourceLocation RBrac) { 2105 if (!TagDecl) 2106 return; 2107 2108 AdjustDeclIfTemplate(TagDecl); 2109 2110 ActOnFields(S, RLoc, TagDecl, 2111 (DeclPtrTy*)FieldCollector->getCurFields(), 2112 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 2113 2114 CheckCompletedCXXClass( 2115 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2116} 2117 2118/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2119/// special functions, such as the default constructor, copy 2120/// constructor, or destructor, to the given C++ class (C++ 2121/// [special]p1). This routine can only be executed just before the 2122/// definition of the class is complete. 2123void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2124 CanQualType ClassType 2125 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2126 2127 // FIXME: Implicit declarations have exception specifications, which are 2128 // the union of the specifications of the implicitly called functions. 2129 2130 if (!ClassDecl->hasUserDeclaredConstructor()) { 2131 // C++ [class.ctor]p5: 2132 // A default constructor for a class X is a constructor of class X 2133 // that can be called without an argument. If there is no 2134 // user-declared constructor for class X, a default constructor is 2135 // implicitly declared. An implicitly-declared default constructor 2136 // is an inline public member of its class. 2137 DeclarationName Name 2138 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2139 CXXConstructorDecl *DefaultCon = 2140 CXXConstructorDecl::Create(Context, ClassDecl, 2141 ClassDecl->getLocation(), Name, 2142 Context.getFunctionType(Context.VoidTy, 2143 0, 0, false, 0), 2144 /*TInfo=*/0, 2145 /*isExplicit=*/false, 2146 /*isInline=*/true, 2147 /*isImplicitlyDeclared=*/true); 2148 DefaultCon->setAccess(AS_public); 2149 DefaultCon->setImplicit(); 2150 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2151 ClassDecl->addDecl(DefaultCon); 2152 } 2153 2154 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2155 // C++ [class.copy]p4: 2156 // If the class definition does not explicitly declare a copy 2157 // constructor, one is declared implicitly. 2158 2159 // C++ [class.copy]p5: 2160 // The implicitly-declared copy constructor for a class X will 2161 // have the form 2162 // 2163 // X::X(const X&) 2164 // 2165 // if 2166 bool HasConstCopyConstructor = true; 2167 2168 // -- each direct or virtual base class B of X has a copy 2169 // constructor whose first parameter is of type const B& or 2170 // const volatile B&, and 2171 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2172 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2173 const CXXRecordDecl *BaseClassDecl 2174 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2175 HasConstCopyConstructor 2176 = BaseClassDecl->hasConstCopyConstructor(Context); 2177 } 2178 2179 // -- for all the nonstatic data members of X that are of a 2180 // class type M (or array thereof), each such class type 2181 // has a copy constructor whose first parameter is of type 2182 // const M& or const volatile M&. 2183 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2184 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2185 ++Field) { 2186 QualType FieldType = (*Field)->getType(); 2187 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2188 FieldType = Array->getElementType(); 2189 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2190 const CXXRecordDecl *FieldClassDecl 2191 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2192 HasConstCopyConstructor 2193 = FieldClassDecl->hasConstCopyConstructor(Context); 2194 } 2195 } 2196 2197 // Otherwise, the implicitly declared copy constructor will have 2198 // the form 2199 // 2200 // X::X(X&) 2201 QualType ArgType = ClassType; 2202 if (HasConstCopyConstructor) 2203 ArgType = ArgType.withConst(); 2204 ArgType = Context.getLValueReferenceType(ArgType); 2205 2206 // An implicitly-declared copy constructor is an inline public 2207 // member of its class. 2208 DeclarationName Name 2209 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2210 CXXConstructorDecl *CopyConstructor 2211 = CXXConstructorDecl::Create(Context, ClassDecl, 2212 ClassDecl->getLocation(), Name, 2213 Context.getFunctionType(Context.VoidTy, 2214 &ArgType, 1, 2215 false, 0), 2216 /*TInfo=*/0, 2217 /*isExplicit=*/false, 2218 /*isInline=*/true, 2219 /*isImplicitlyDeclared=*/true); 2220 CopyConstructor->setAccess(AS_public); 2221 CopyConstructor->setImplicit(); 2222 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2223 2224 // Add the parameter to the constructor. 2225 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2226 ClassDecl->getLocation(), 2227 /*IdentifierInfo=*/0, 2228 ArgType, /*TInfo=*/0, 2229 VarDecl::None, 0); 2230 CopyConstructor->setParams(Context, &FromParam, 1); 2231 ClassDecl->addDecl(CopyConstructor); 2232 } 2233 2234 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2235 // Note: The following rules are largely analoguous to the copy 2236 // constructor rules. Note that virtual bases are not taken into account 2237 // for determining the argument type of the operator. Note also that 2238 // operators taking an object instead of a reference are allowed. 2239 // 2240 // C++ [class.copy]p10: 2241 // If the class definition does not explicitly declare a copy 2242 // assignment operator, one is declared implicitly. 2243 // The implicitly-defined copy assignment operator for a class X 2244 // will have the form 2245 // 2246 // X& X::operator=(const X&) 2247 // 2248 // if 2249 bool HasConstCopyAssignment = true; 2250 2251 // -- each direct base class B of X has a copy assignment operator 2252 // whose parameter is of type const B&, const volatile B& or B, 2253 // and 2254 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2255 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2256 assert(!Base->getType()->isDependentType() && 2257 "Cannot generate implicit members for class with dependent bases."); 2258 const CXXRecordDecl *BaseClassDecl 2259 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2260 const CXXMethodDecl *MD = 0; 2261 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2262 MD); 2263 } 2264 2265 // -- for all the nonstatic data members of X that are of a class 2266 // type M (or array thereof), each such class type has a copy 2267 // assignment operator whose parameter is of type const M&, 2268 // const volatile M& or M. 2269 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2270 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2271 ++Field) { 2272 QualType FieldType = (*Field)->getType(); 2273 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2274 FieldType = Array->getElementType(); 2275 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2276 const CXXRecordDecl *FieldClassDecl 2277 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2278 const CXXMethodDecl *MD = 0; 2279 HasConstCopyAssignment 2280 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2281 } 2282 } 2283 2284 // Otherwise, the implicitly declared copy assignment operator will 2285 // have the form 2286 // 2287 // X& X::operator=(X&) 2288 QualType ArgType = ClassType; 2289 QualType RetType = Context.getLValueReferenceType(ArgType); 2290 if (HasConstCopyAssignment) 2291 ArgType = ArgType.withConst(); 2292 ArgType = Context.getLValueReferenceType(ArgType); 2293 2294 // An implicitly-declared copy assignment operator is an inline public 2295 // member of its class. 2296 DeclarationName Name = 2297 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2298 CXXMethodDecl *CopyAssignment = 2299 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2300 Context.getFunctionType(RetType, &ArgType, 1, 2301 false, 0), 2302 /*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2303 CopyAssignment->setAccess(AS_public); 2304 CopyAssignment->setImplicit(); 2305 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2306 CopyAssignment->setCopyAssignment(true); 2307 2308 // Add the parameter to the operator. 2309 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2310 ClassDecl->getLocation(), 2311 /*IdentifierInfo=*/0, 2312 ArgType, /*TInfo=*/0, 2313 VarDecl::None, 0); 2314 CopyAssignment->setParams(Context, &FromParam, 1); 2315 2316 // Don't call addedAssignmentOperator. There is no way to distinguish an 2317 // implicit from an explicit assignment operator. 2318 ClassDecl->addDecl(CopyAssignment); 2319 AddOverriddenMethods(ClassDecl, CopyAssignment); 2320 } 2321 2322 if (!ClassDecl->hasUserDeclaredDestructor()) { 2323 // C++ [class.dtor]p2: 2324 // If a class has no user-declared destructor, a destructor is 2325 // declared implicitly. An implicitly-declared destructor is an 2326 // inline public member of its class. 2327 DeclarationName Name 2328 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2329 CXXDestructorDecl *Destructor 2330 = CXXDestructorDecl::Create(Context, ClassDecl, 2331 ClassDecl->getLocation(), Name, 2332 Context.getFunctionType(Context.VoidTy, 2333 0, 0, false, 0), 2334 /*isInline=*/true, 2335 /*isImplicitlyDeclared=*/true); 2336 Destructor->setAccess(AS_public); 2337 Destructor->setImplicit(); 2338 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2339 ClassDecl->addDecl(Destructor); 2340 2341 AddOverriddenMethods(ClassDecl, Destructor); 2342 } 2343} 2344 2345void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2346 Decl *D = TemplateD.getAs<Decl>(); 2347 if (!D) 2348 return; 2349 2350 TemplateParameterList *Params = 0; 2351 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2352 Params = Template->getTemplateParameters(); 2353 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2354 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2355 Params = PartialSpec->getTemplateParameters(); 2356 else 2357 return; 2358 2359 for (TemplateParameterList::iterator Param = Params->begin(), 2360 ParamEnd = Params->end(); 2361 Param != ParamEnd; ++Param) { 2362 NamedDecl *Named = cast<NamedDecl>(*Param); 2363 if (Named->getDeclName()) { 2364 S->AddDecl(DeclPtrTy::make(Named)); 2365 IdResolver.AddDecl(Named); 2366 } 2367 } 2368} 2369 2370void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2371 if (!RecordD) return; 2372 AdjustDeclIfTemplate(RecordD); 2373 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2374 PushDeclContext(S, Record); 2375} 2376 2377void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2378 if (!RecordD) return; 2379 PopDeclContext(); 2380} 2381 2382/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2383/// parsing a top-level (non-nested) C++ class, and we are now 2384/// parsing those parts of the given Method declaration that could 2385/// not be parsed earlier (C++ [class.mem]p2), such as default 2386/// arguments. This action should enter the scope of the given 2387/// Method declaration as if we had just parsed the qualified method 2388/// name. However, it should not bring the parameters into scope; 2389/// that will be performed by ActOnDelayedCXXMethodParameter. 2390void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2391} 2392 2393/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2394/// C++ method declaration. We're (re-)introducing the given 2395/// function parameter into scope for use in parsing later parts of 2396/// the method declaration. For example, we could see an 2397/// ActOnParamDefaultArgument event for this parameter. 2398void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2399 if (!ParamD) 2400 return; 2401 2402 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2403 2404 // If this parameter has an unparsed default argument, clear it out 2405 // to make way for the parsed default argument. 2406 if (Param->hasUnparsedDefaultArg()) 2407 Param->setDefaultArg(0); 2408 2409 S->AddDecl(DeclPtrTy::make(Param)); 2410 if (Param->getDeclName()) 2411 IdResolver.AddDecl(Param); 2412} 2413 2414/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2415/// processing the delayed method declaration for Method. The method 2416/// declaration is now considered finished. There may be a separate 2417/// ActOnStartOfFunctionDef action later (not necessarily 2418/// immediately!) for this method, if it was also defined inside the 2419/// class body. 2420void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2421 if (!MethodD) 2422 return; 2423 2424 AdjustDeclIfTemplate(MethodD); 2425 2426 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2427 2428 // Now that we have our default arguments, check the constructor 2429 // again. It could produce additional diagnostics or affect whether 2430 // the class has implicitly-declared destructors, among other 2431 // things. 2432 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2433 CheckConstructor(Constructor); 2434 2435 // Check the default arguments, which we may have added. 2436 if (!Method->isInvalidDecl()) 2437 CheckCXXDefaultArguments(Method); 2438} 2439 2440/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2441/// the well-formedness of the constructor declarator @p D with type @p 2442/// R. If there are any errors in the declarator, this routine will 2443/// emit diagnostics and set the invalid bit to true. In any case, the type 2444/// will be updated to reflect a well-formed type for the constructor and 2445/// returned. 2446QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2447 FunctionDecl::StorageClass &SC) { 2448 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2449 2450 // C++ [class.ctor]p3: 2451 // A constructor shall not be virtual (10.3) or static (9.4). A 2452 // constructor can be invoked for a const, volatile or const 2453 // volatile object. A constructor shall not be declared const, 2454 // volatile, or const volatile (9.3.2). 2455 if (isVirtual) { 2456 if (!D.isInvalidType()) 2457 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2458 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2459 << SourceRange(D.getIdentifierLoc()); 2460 D.setInvalidType(); 2461 } 2462 if (SC == FunctionDecl::Static) { 2463 if (!D.isInvalidType()) 2464 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2465 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2466 << SourceRange(D.getIdentifierLoc()); 2467 D.setInvalidType(); 2468 SC = FunctionDecl::None; 2469 } 2470 2471 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2472 if (FTI.TypeQuals != 0) { 2473 if (FTI.TypeQuals & Qualifiers::Const) 2474 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2475 << "const" << SourceRange(D.getIdentifierLoc()); 2476 if (FTI.TypeQuals & Qualifiers::Volatile) 2477 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2478 << "volatile" << SourceRange(D.getIdentifierLoc()); 2479 if (FTI.TypeQuals & Qualifiers::Restrict) 2480 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2481 << "restrict" << SourceRange(D.getIdentifierLoc()); 2482 } 2483 2484 // Rebuild the function type "R" without any type qualifiers (in 2485 // case any of the errors above fired) and with "void" as the 2486 // return type, since constructors don't have return types. We 2487 // *always* have to do this, because GetTypeForDeclarator will 2488 // put in a result type of "int" when none was specified. 2489 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2490 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2491 Proto->getNumArgs(), 2492 Proto->isVariadic(), 0); 2493} 2494 2495/// CheckConstructor - Checks a fully-formed constructor for 2496/// well-formedness, issuing any diagnostics required. Returns true if 2497/// the constructor declarator is invalid. 2498void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2499 CXXRecordDecl *ClassDecl 2500 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2501 if (!ClassDecl) 2502 return Constructor->setInvalidDecl(); 2503 2504 // C++ [class.copy]p3: 2505 // A declaration of a constructor for a class X is ill-formed if 2506 // its first parameter is of type (optionally cv-qualified) X and 2507 // either there are no other parameters or else all other 2508 // parameters have default arguments. 2509 if (!Constructor->isInvalidDecl() && 2510 ((Constructor->getNumParams() == 1) || 2511 (Constructor->getNumParams() > 1 && 2512 Constructor->getParamDecl(1)->hasDefaultArg())) && 2513 Constructor->getTemplateSpecializationKind() 2514 != TSK_ImplicitInstantiation) { 2515 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2516 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2517 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2518 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2519 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2520 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 2521 2522 // FIXME: Rather that making the constructor invalid, we should endeavor 2523 // to fix the type. 2524 Constructor->setInvalidDecl(); 2525 } 2526 } 2527 2528 // Notify the class that we've added a constructor. 2529 ClassDecl->addedConstructor(Context, Constructor); 2530} 2531 2532/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2533/// issuing any diagnostics required. Returns true on error. 2534bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2535 CXXRecordDecl *RD = Destructor->getParent(); 2536 2537 if (Destructor->isVirtual()) { 2538 SourceLocation Loc; 2539 2540 if (!Destructor->isImplicit()) 2541 Loc = Destructor->getLocation(); 2542 else 2543 Loc = RD->getLocation(); 2544 2545 // If we have a virtual destructor, look up the deallocation function 2546 FunctionDecl *OperatorDelete = 0; 2547 DeclarationName Name = 2548 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2549 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2550 return true; 2551 2552 Destructor->setOperatorDelete(OperatorDelete); 2553 } 2554 2555 return false; 2556} 2557 2558static inline bool 2559FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2560 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2561 FTI.ArgInfo[0].Param && 2562 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2563} 2564 2565/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2566/// the well-formednes of the destructor declarator @p D with type @p 2567/// R. If there are any errors in the declarator, this routine will 2568/// emit diagnostics and set the declarator to invalid. Even if this happens, 2569/// will be updated to reflect a well-formed type for the destructor and 2570/// returned. 2571QualType Sema::CheckDestructorDeclarator(Declarator &D, 2572 FunctionDecl::StorageClass& SC) { 2573 // C++ [class.dtor]p1: 2574 // [...] A typedef-name that names a class is a class-name 2575 // (7.1.3); however, a typedef-name that names a class shall not 2576 // be used as the identifier in the declarator for a destructor 2577 // declaration. 2578 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2579 if (isa<TypedefType>(DeclaratorType)) { 2580 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2581 << DeclaratorType; 2582 D.setInvalidType(); 2583 } 2584 2585 // C++ [class.dtor]p2: 2586 // A destructor is used to destroy objects of its class type. A 2587 // destructor takes no parameters, and no return type can be 2588 // specified for it (not even void). The address of a destructor 2589 // shall not be taken. A destructor shall not be static. A 2590 // destructor can be invoked for a const, volatile or const 2591 // volatile object. A destructor shall not be declared const, 2592 // volatile or const volatile (9.3.2). 2593 if (SC == FunctionDecl::Static) { 2594 if (!D.isInvalidType()) 2595 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2596 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2597 << SourceRange(D.getIdentifierLoc()); 2598 SC = FunctionDecl::None; 2599 D.setInvalidType(); 2600 } 2601 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2602 // Destructors don't have return types, but the parser will 2603 // happily parse something like: 2604 // 2605 // class X { 2606 // float ~X(); 2607 // }; 2608 // 2609 // The return type will be eliminated later. 2610 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2611 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2612 << SourceRange(D.getIdentifierLoc()); 2613 } 2614 2615 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2616 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2617 if (FTI.TypeQuals & Qualifiers::Const) 2618 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2619 << "const" << SourceRange(D.getIdentifierLoc()); 2620 if (FTI.TypeQuals & Qualifiers::Volatile) 2621 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2622 << "volatile" << SourceRange(D.getIdentifierLoc()); 2623 if (FTI.TypeQuals & Qualifiers::Restrict) 2624 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2625 << "restrict" << SourceRange(D.getIdentifierLoc()); 2626 D.setInvalidType(); 2627 } 2628 2629 // Make sure we don't have any parameters. 2630 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2631 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2632 2633 // Delete the parameters. 2634 FTI.freeArgs(); 2635 D.setInvalidType(); 2636 } 2637 2638 // Make sure the destructor isn't variadic. 2639 if (FTI.isVariadic) { 2640 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2641 D.setInvalidType(); 2642 } 2643 2644 // Rebuild the function type "R" without any type qualifiers or 2645 // parameters (in case any of the errors above fired) and with 2646 // "void" as the return type, since destructors don't have return 2647 // types. We *always* have to do this, because GetTypeForDeclarator 2648 // will put in a result type of "int" when none was specified. 2649 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 2650} 2651 2652/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2653/// well-formednes of the conversion function declarator @p D with 2654/// type @p R. If there are any errors in the declarator, this routine 2655/// will emit diagnostics and return true. Otherwise, it will return 2656/// false. Either way, the type @p R will be updated to reflect a 2657/// well-formed type for the conversion operator. 2658void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2659 FunctionDecl::StorageClass& SC) { 2660 // C++ [class.conv.fct]p1: 2661 // Neither parameter types nor return type can be specified. The 2662 // type of a conversion function (8.3.5) is "function taking no 2663 // parameter returning conversion-type-id." 2664 if (SC == FunctionDecl::Static) { 2665 if (!D.isInvalidType()) 2666 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2667 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2668 << SourceRange(D.getIdentifierLoc()); 2669 D.setInvalidType(); 2670 SC = FunctionDecl::None; 2671 } 2672 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2673 // Conversion functions don't have return types, but the parser will 2674 // happily parse something like: 2675 // 2676 // class X { 2677 // float operator bool(); 2678 // }; 2679 // 2680 // The return type will be changed later anyway. 2681 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2682 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2683 << SourceRange(D.getIdentifierLoc()); 2684 } 2685 2686 // Make sure we don't have any parameters. 2687 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2688 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2689 2690 // Delete the parameters. 2691 D.getTypeObject(0).Fun.freeArgs(); 2692 D.setInvalidType(); 2693 } 2694 2695 // Make sure the conversion function isn't variadic. 2696 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2697 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2698 D.setInvalidType(); 2699 } 2700 2701 // C++ [class.conv.fct]p4: 2702 // The conversion-type-id shall not represent a function type nor 2703 // an array type. 2704 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2705 if (ConvType->isArrayType()) { 2706 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2707 ConvType = Context.getPointerType(ConvType); 2708 D.setInvalidType(); 2709 } else if (ConvType->isFunctionType()) { 2710 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2711 ConvType = Context.getPointerType(ConvType); 2712 D.setInvalidType(); 2713 } 2714 2715 // Rebuild the function type "R" without any parameters (in case any 2716 // of the errors above fired) and with the conversion type as the 2717 // return type. 2718 R = Context.getFunctionType(ConvType, 0, 0, false, 2719 R->getAs<FunctionProtoType>()->getTypeQuals()); 2720 2721 // C++0x explicit conversion operators. 2722 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2723 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2724 diag::warn_explicit_conversion_functions) 2725 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2726} 2727 2728/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2729/// the declaration of the given C++ conversion function. This routine 2730/// is responsible for recording the conversion function in the C++ 2731/// class, if possible. 2732Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2733 assert(Conversion && "Expected to receive a conversion function declaration"); 2734 2735 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2736 2737 // Make sure we aren't redeclaring the conversion function. 2738 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2739 2740 // C++ [class.conv.fct]p1: 2741 // [...] A conversion function is never used to convert a 2742 // (possibly cv-qualified) object to the (possibly cv-qualified) 2743 // same object type (or a reference to it), to a (possibly 2744 // cv-qualified) base class of that type (or a reference to it), 2745 // or to (possibly cv-qualified) void. 2746 // FIXME: Suppress this warning if the conversion function ends up being a 2747 // virtual function that overrides a virtual function in a base class. 2748 QualType ClassType 2749 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2750 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2751 ConvType = ConvTypeRef->getPointeeType(); 2752 if (ConvType->isRecordType()) { 2753 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2754 if (ConvType == ClassType) 2755 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2756 << ClassType; 2757 else if (IsDerivedFrom(ClassType, ConvType)) 2758 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2759 << ClassType << ConvType; 2760 } else if (ConvType->isVoidType()) { 2761 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2762 << ClassType << ConvType; 2763 } 2764 2765 if (Conversion->getPrimaryTemplate()) { 2766 // ignore specializations 2767 } else if (Conversion->getPreviousDeclaration()) { 2768 if (FunctionTemplateDecl *ConversionTemplate 2769 = Conversion->getDescribedFunctionTemplate()) { 2770 if (ClassDecl->replaceConversion( 2771 ConversionTemplate->getPreviousDeclaration(), 2772 ConversionTemplate)) 2773 return DeclPtrTy::make(ConversionTemplate); 2774 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 2775 Conversion)) 2776 return DeclPtrTy::make(Conversion); 2777 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2778 } else if (FunctionTemplateDecl *ConversionTemplate 2779 = Conversion->getDescribedFunctionTemplate()) 2780 ClassDecl->addConversionFunction(ConversionTemplate); 2781 else 2782 ClassDecl->addConversionFunction(Conversion); 2783 2784 return DeclPtrTy::make(Conversion); 2785} 2786 2787//===----------------------------------------------------------------------===// 2788// Namespace Handling 2789//===----------------------------------------------------------------------===// 2790 2791/// ActOnStartNamespaceDef - This is called at the start of a namespace 2792/// definition. 2793Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2794 SourceLocation IdentLoc, 2795 IdentifierInfo *II, 2796 SourceLocation LBrace) { 2797 NamespaceDecl *Namespc = 2798 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2799 Namespc->setLBracLoc(LBrace); 2800 2801 Scope *DeclRegionScope = NamespcScope->getParent(); 2802 2803 if (II) { 2804 // C++ [namespace.def]p2: 2805 // The identifier in an original-namespace-definition shall not have been 2806 // previously defined in the declarative region in which the 2807 // original-namespace-definition appears. The identifier in an 2808 // original-namespace-definition is the name of the namespace. Subsequently 2809 // in that declarative region, it is treated as an original-namespace-name. 2810 2811 NamedDecl *PrevDecl 2812 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2813 ForRedeclaration); 2814 2815 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2816 // This is an extended namespace definition. 2817 // Attach this namespace decl to the chain of extended namespace 2818 // definitions. 2819 OrigNS->setNextNamespace(Namespc); 2820 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2821 2822 // Remove the previous declaration from the scope. 2823 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2824 IdResolver.RemoveDecl(OrigNS); 2825 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2826 } 2827 } else if (PrevDecl) { 2828 // This is an invalid name redefinition. 2829 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2830 << Namespc->getDeclName(); 2831 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2832 Namespc->setInvalidDecl(); 2833 // Continue on to push Namespc as current DeclContext and return it. 2834 } else if (II->isStr("std") && 2835 CurContext->getLookupContext()->isTranslationUnit()) { 2836 // This is the first "real" definition of the namespace "std", so update 2837 // our cache of the "std" namespace to point at this definition. 2838 if (StdNamespace) { 2839 // We had already defined a dummy namespace "std". Link this new 2840 // namespace definition to the dummy namespace "std". 2841 StdNamespace->setNextNamespace(Namespc); 2842 StdNamespace->setLocation(IdentLoc); 2843 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2844 } 2845 2846 // Make our StdNamespace cache point at the first real definition of the 2847 // "std" namespace. 2848 StdNamespace = Namespc; 2849 } 2850 2851 PushOnScopeChains(Namespc, DeclRegionScope); 2852 } else { 2853 // Anonymous namespaces. 2854 assert(Namespc->isAnonymousNamespace()); 2855 CurContext->addDecl(Namespc); 2856 2857 // Link the anonymous namespace into its parent. 2858 NamespaceDecl *PrevDecl; 2859 DeclContext *Parent = CurContext->getLookupContext(); 2860 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 2861 PrevDecl = TU->getAnonymousNamespace(); 2862 TU->setAnonymousNamespace(Namespc); 2863 } else { 2864 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 2865 PrevDecl = ND->getAnonymousNamespace(); 2866 ND->setAnonymousNamespace(Namespc); 2867 } 2868 2869 // Link the anonymous namespace with its previous declaration. 2870 if (PrevDecl) { 2871 assert(PrevDecl->isAnonymousNamespace()); 2872 assert(!PrevDecl->getNextNamespace()); 2873 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 2874 PrevDecl->setNextNamespace(Namespc); 2875 } 2876 2877 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2878 // behaves as if it were replaced by 2879 // namespace unique { /* empty body */ } 2880 // using namespace unique; 2881 // namespace unique { namespace-body } 2882 // where all occurrences of 'unique' in a translation unit are 2883 // replaced by the same identifier and this identifier differs 2884 // from all other identifiers in the entire program. 2885 2886 // We just create the namespace with an empty name and then add an 2887 // implicit using declaration, just like the standard suggests. 2888 // 2889 // CodeGen enforces the "universally unique" aspect by giving all 2890 // declarations semantically contained within an anonymous 2891 // namespace internal linkage. 2892 2893 if (!PrevDecl) { 2894 UsingDirectiveDecl* UD 2895 = UsingDirectiveDecl::Create(Context, CurContext, 2896 /* 'using' */ LBrace, 2897 /* 'namespace' */ SourceLocation(), 2898 /* qualifier */ SourceRange(), 2899 /* NNS */ NULL, 2900 /* identifier */ SourceLocation(), 2901 Namespc, 2902 /* Ancestor */ CurContext); 2903 UD->setImplicit(); 2904 CurContext->addDecl(UD); 2905 } 2906 } 2907 2908 // Although we could have an invalid decl (i.e. the namespace name is a 2909 // redefinition), push it as current DeclContext and try to continue parsing. 2910 // FIXME: We should be able to push Namespc here, so that the each DeclContext 2911 // for the namespace has the declarations that showed up in that particular 2912 // namespace definition. 2913 PushDeclContext(NamespcScope, Namespc); 2914 return DeclPtrTy::make(Namespc); 2915} 2916 2917/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2918/// is a namespace alias, returns the namespace it points to. 2919static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2920 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2921 return AD->getNamespace(); 2922 return dyn_cast_or_null<NamespaceDecl>(D); 2923} 2924 2925/// ActOnFinishNamespaceDef - This callback is called after a namespace is 2926/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 2927void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 2928 Decl *Dcl = D.getAs<Decl>(); 2929 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 2930 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 2931 Namespc->setRBracLoc(RBrace); 2932 PopDeclContext(); 2933} 2934 2935Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 2936 SourceLocation UsingLoc, 2937 SourceLocation NamespcLoc, 2938 const CXXScopeSpec &SS, 2939 SourceLocation IdentLoc, 2940 IdentifierInfo *NamespcName, 2941 AttributeList *AttrList) { 2942 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2943 assert(NamespcName && "Invalid NamespcName."); 2944 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 2945 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2946 2947 UsingDirectiveDecl *UDir = 0; 2948 2949 // Lookup namespace name. 2950 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 2951 LookupParsedName(R, S, &SS); 2952 if (R.isAmbiguous()) 2953 return DeclPtrTy(); 2954 2955 if (!R.empty()) { 2956 NamedDecl *Named = R.getFoundDecl(); 2957 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 2958 && "expected namespace decl"); 2959 // C++ [namespace.udir]p1: 2960 // A using-directive specifies that the names in the nominated 2961 // namespace can be used in the scope in which the 2962 // using-directive appears after the using-directive. During 2963 // unqualified name lookup (3.4.1), the names appear as if they 2964 // were declared in the nearest enclosing namespace which 2965 // contains both the using-directive and the nominated 2966 // namespace. [Note: in this context, "contains" means "contains 2967 // directly or indirectly". ] 2968 2969 // Find enclosing context containing both using-directive and 2970 // nominated namespace. 2971 NamespaceDecl *NS = getNamespaceDecl(Named); 2972 DeclContext *CommonAncestor = cast<DeclContext>(NS); 2973 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 2974 CommonAncestor = CommonAncestor->getParent(); 2975 2976 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 2977 SS.getRange(), 2978 (NestedNameSpecifier *)SS.getScopeRep(), 2979 IdentLoc, Named, CommonAncestor); 2980 PushUsingDirective(S, UDir); 2981 } else { 2982 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 2983 } 2984 2985 // FIXME: We ignore attributes for now. 2986 delete AttrList; 2987 return DeclPtrTy::make(UDir); 2988} 2989 2990void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2991 // If scope has associated entity, then using directive is at namespace 2992 // or translation unit scope. We add UsingDirectiveDecls, into 2993 // it's lookup structure. 2994 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2995 Ctx->addDecl(UDir); 2996 else 2997 // Otherwise it is block-sope. using-directives will affect lookup 2998 // only to the end of scope. 2999 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3000} 3001 3002 3003Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3004 AccessSpecifier AS, 3005 bool HasUsingKeyword, 3006 SourceLocation UsingLoc, 3007 const CXXScopeSpec &SS, 3008 UnqualifiedId &Name, 3009 AttributeList *AttrList, 3010 bool IsTypeName, 3011 SourceLocation TypenameLoc) { 3012 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3013 3014 switch (Name.getKind()) { 3015 case UnqualifiedId::IK_Identifier: 3016 case UnqualifiedId::IK_OperatorFunctionId: 3017 case UnqualifiedId::IK_LiteralOperatorId: 3018 case UnqualifiedId::IK_ConversionFunctionId: 3019 break; 3020 3021 case UnqualifiedId::IK_ConstructorName: 3022 case UnqualifiedId::IK_ConstructorTemplateId: 3023 // C++0x inherited constructors. 3024 if (getLangOptions().CPlusPlus0x) break; 3025 3026 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3027 << SS.getRange(); 3028 return DeclPtrTy(); 3029 3030 case UnqualifiedId::IK_DestructorName: 3031 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3032 << SS.getRange(); 3033 return DeclPtrTy(); 3034 3035 case UnqualifiedId::IK_TemplateId: 3036 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3037 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3038 return DeclPtrTy(); 3039 } 3040 3041 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3042 if (!TargetName) 3043 return DeclPtrTy(); 3044 3045 // Warn about using declarations. 3046 // TODO: store that the declaration was written without 'using' and 3047 // talk about access decls instead of using decls in the 3048 // diagnostics. 3049 if (!HasUsingKeyword) { 3050 UsingLoc = Name.getSourceRange().getBegin(); 3051 3052 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3053 << CodeModificationHint::CreateInsertion(SS.getRange().getBegin(), 3054 "using "); 3055 } 3056 3057 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3058 Name.getSourceRange().getBegin(), 3059 TargetName, AttrList, 3060 /* IsInstantiation */ false, 3061 IsTypeName, TypenameLoc); 3062 if (UD) 3063 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3064 3065 return DeclPtrTy::make(UD); 3066} 3067 3068/// Determines whether to create a using shadow decl for a particular 3069/// decl, given the set of decls existing prior to this using lookup. 3070bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3071 const LookupResult &Previous) { 3072 // Diagnose finding a decl which is not from a base class of the 3073 // current class. We do this now because there are cases where this 3074 // function will silently decide not to build a shadow decl, which 3075 // will pre-empt further diagnostics. 3076 // 3077 // We don't need to do this in C++0x because we do the check once on 3078 // the qualifier. 3079 // 3080 // FIXME: diagnose the following if we care enough: 3081 // struct A { int foo; }; 3082 // struct B : A { using A::foo; }; 3083 // template <class T> struct C : A {}; 3084 // template <class T> struct D : C<T> { using B::foo; } // <--- 3085 // This is invalid (during instantiation) in C++03 because B::foo 3086 // resolves to the using decl in B, which is not a base class of D<T>. 3087 // We can't diagnose it immediately because C<T> is an unknown 3088 // specialization. The UsingShadowDecl in D<T> then points directly 3089 // to A::foo, which will look well-formed when we instantiate. 3090 // The right solution is to not collapse the shadow-decl chain. 3091 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3092 DeclContext *OrigDC = Orig->getDeclContext(); 3093 3094 // Handle enums and anonymous structs. 3095 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3096 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3097 while (OrigRec->isAnonymousStructOrUnion()) 3098 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3099 3100 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3101 if (OrigDC == CurContext) { 3102 Diag(Using->getLocation(), 3103 diag::err_using_decl_nested_name_specifier_is_current_class) 3104 << Using->getNestedNameRange(); 3105 Diag(Orig->getLocation(), diag::note_using_decl_target); 3106 return true; 3107 } 3108 3109 Diag(Using->getNestedNameRange().getBegin(), 3110 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3111 << Using->getTargetNestedNameDecl() 3112 << cast<CXXRecordDecl>(CurContext) 3113 << Using->getNestedNameRange(); 3114 Diag(Orig->getLocation(), diag::note_using_decl_target); 3115 return true; 3116 } 3117 } 3118 3119 if (Previous.empty()) return false; 3120 3121 NamedDecl *Target = Orig; 3122 if (isa<UsingShadowDecl>(Target)) 3123 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3124 3125 // If the target happens to be one of the previous declarations, we 3126 // don't have a conflict. 3127 // 3128 // FIXME: but we might be increasing its access, in which case we 3129 // should redeclare it. 3130 NamedDecl *NonTag = 0, *Tag = 0; 3131 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3132 I != E; ++I) { 3133 NamedDecl *D = (*I)->getUnderlyingDecl(); 3134 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3135 return false; 3136 3137 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3138 } 3139 3140 if (Target->isFunctionOrFunctionTemplate()) { 3141 FunctionDecl *FD; 3142 if (isa<FunctionTemplateDecl>(Target)) 3143 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3144 else 3145 FD = cast<FunctionDecl>(Target); 3146 3147 NamedDecl *OldDecl = 0; 3148 switch (CheckOverload(FD, Previous, OldDecl)) { 3149 case Ovl_Overload: 3150 return false; 3151 3152 case Ovl_NonFunction: 3153 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3154 break; 3155 3156 // We found a decl with the exact signature. 3157 case Ovl_Match: 3158 if (isa<UsingShadowDecl>(OldDecl)) { 3159 // Silently ignore the possible conflict. 3160 return false; 3161 } 3162 3163 // If we're in a record, we want to hide the target, so we 3164 // return true (without a diagnostic) to tell the caller not to 3165 // build a shadow decl. 3166 if (CurContext->isRecord()) 3167 return true; 3168 3169 // If we're not in a record, this is an error. 3170 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3171 break; 3172 } 3173 3174 Diag(Target->getLocation(), diag::note_using_decl_target); 3175 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3176 return true; 3177 } 3178 3179 // Target is not a function. 3180 3181 if (isa<TagDecl>(Target)) { 3182 // No conflict between a tag and a non-tag. 3183 if (!Tag) return false; 3184 3185 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3186 Diag(Target->getLocation(), diag::note_using_decl_target); 3187 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3188 return true; 3189 } 3190 3191 // No conflict between a tag and a non-tag. 3192 if (!NonTag) return false; 3193 3194 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3195 Diag(Target->getLocation(), diag::note_using_decl_target); 3196 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3197 return true; 3198} 3199 3200/// Builds a shadow declaration corresponding to a 'using' declaration. 3201UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3202 UsingDecl *UD, 3203 NamedDecl *Orig) { 3204 3205 // If we resolved to another shadow declaration, just coalesce them. 3206 NamedDecl *Target = Orig; 3207 if (isa<UsingShadowDecl>(Target)) { 3208 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3209 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3210 } 3211 3212 UsingShadowDecl *Shadow 3213 = UsingShadowDecl::Create(Context, CurContext, 3214 UD->getLocation(), UD, Target); 3215 UD->addShadowDecl(Shadow); 3216 3217 if (S) 3218 PushOnScopeChains(Shadow, S); 3219 else 3220 CurContext->addDecl(Shadow); 3221 Shadow->setAccess(UD->getAccess()); 3222 3223 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3224 Shadow->setInvalidDecl(); 3225 3226 return Shadow; 3227} 3228 3229/// Hides a using shadow declaration. This is required by the current 3230/// using-decl implementation when a resolvable using declaration in a 3231/// class is followed by a declaration which would hide or override 3232/// one or more of the using decl's targets; for example: 3233/// 3234/// struct Base { void foo(int); }; 3235/// struct Derived : Base { 3236/// using Base::foo; 3237/// void foo(int); 3238/// }; 3239/// 3240/// The governing language is C++03 [namespace.udecl]p12: 3241/// 3242/// When a using-declaration brings names from a base class into a 3243/// derived class scope, member functions in the derived class 3244/// override and/or hide member functions with the same name and 3245/// parameter types in a base class (rather than conflicting). 3246/// 3247/// There are two ways to implement this: 3248/// (1) optimistically create shadow decls when they're not hidden 3249/// by existing declarations, or 3250/// (2) don't create any shadow decls (or at least don't make them 3251/// visible) until we've fully parsed/instantiated the class. 3252/// The problem with (1) is that we might have to retroactively remove 3253/// a shadow decl, which requires several O(n) operations because the 3254/// decl structures are (very reasonably) not designed for removal. 3255/// (2) avoids this but is very fiddly and phase-dependent. 3256void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3257 // Remove it from the DeclContext... 3258 Shadow->getDeclContext()->removeDecl(Shadow); 3259 3260 // ...and the scope, if applicable... 3261 if (S) { 3262 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3263 IdResolver.RemoveDecl(Shadow); 3264 } 3265 3266 // ...and the using decl. 3267 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3268 3269 // TODO: complain somehow if Shadow was used. It shouldn't 3270 // be possible for this to happen, because 3271} 3272 3273/// Builds a using declaration. 3274/// 3275/// \param IsInstantiation - Whether this call arises from an 3276/// instantiation of an unresolved using declaration. We treat 3277/// the lookup differently for these declarations. 3278NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3279 SourceLocation UsingLoc, 3280 const CXXScopeSpec &SS, 3281 SourceLocation IdentLoc, 3282 DeclarationName Name, 3283 AttributeList *AttrList, 3284 bool IsInstantiation, 3285 bool IsTypeName, 3286 SourceLocation TypenameLoc) { 3287 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3288 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3289 3290 // FIXME: We ignore attributes for now. 3291 delete AttrList; 3292 3293 if (SS.isEmpty()) { 3294 Diag(IdentLoc, diag::err_using_requires_qualname); 3295 return 0; 3296 } 3297 3298 // Do the redeclaration lookup in the current scope. 3299 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3300 ForRedeclaration); 3301 Previous.setHideTags(false); 3302 if (S) { 3303 LookupName(Previous, S); 3304 3305 // It is really dumb that we have to do this. 3306 LookupResult::Filter F = Previous.makeFilter(); 3307 while (F.hasNext()) { 3308 NamedDecl *D = F.next(); 3309 if (!isDeclInScope(D, CurContext, S)) 3310 F.erase(); 3311 } 3312 F.done(); 3313 } else { 3314 assert(IsInstantiation && "no scope in non-instantiation"); 3315 assert(CurContext->isRecord() && "scope not record in instantiation"); 3316 LookupQualifiedName(Previous, CurContext); 3317 } 3318 3319 NestedNameSpecifier *NNS = 3320 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3321 3322 // Check for invalid redeclarations. 3323 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3324 return 0; 3325 3326 // Check for bad qualifiers. 3327 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3328 return 0; 3329 3330 DeclContext *LookupContext = computeDeclContext(SS); 3331 NamedDecl *D; 3332 if (!LookupContext) { 3333 if (IsTypeName) { 3334 // FIXME: not all declaration name kinds are legal here 3335 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3336 UsingLoc, TypenameLoc, 3337 SS.getRange(), NNS, 3338 IdentLoc, Name); 3339 } else { 3340 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3341 UsingLoc, SS.getRange(), NNS, 3342 IdentLoc, Name); 3343 } 3344 } else { 3345 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3346 SS.getRange(), UsingLoc, NNS, Name, 3347 IsTypeName); 3348 } 3349 D->setAccess(AS); 3350 CurContext->addDecl(D); 3351 3352 if (!LookupContext) return D; 3353 UsingDecl *UD = cast<UsingDecl>(D); 3354 3355 if (RequireCompleteDeclContext(SS)) { 3356 UD->setInvalidDecl(); 3357 return UD; 3358 } 3359 3360 // Look up the target name. 3361 3362 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3363 3364 // Unlike most lookups, we don't always want to hide tag 3365 // declarations: tag names are visible through the using declaration 3366 // even if hidden by ordinary names, *except* in a dependent context 3367 // where it's important for the sanity of two-phase lookup. 3368 if (!IsInstantiation) 3369 R.setHideTags(false); 3370 3371 LookupQualifiedName(R, LookupContext); 3372 3373 if (R.empty()) { 3374 Diag(IdentLoc, diag::err_no_member) 3375 << Name << LookupContext << SS.getRange(); 3376 UD->setInvalidDecl(); 3377 return UD; 3378 } 3379 3380 if (R.isAmbiguous()) { 3381 UD->setInvalidDecl(); 3382 return UD; 3383 } 3384 3385 if (IsTypeName) { 3386 // If we asked for a typename and got a non-type decl, error out. 3387 if (!R.getAsSingle<TypeDecl>()) { 3388 Diag(IdentLoc, diag::err_using_typename_non_type); 3389 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3390 Diag((*I)->getUnderlyingDecl()->getLocation(), 3391 diag::note_using_decl_target); 3392 UD->setInvalidDecl(); 3393 return UD; 3394 } 3395 } else { 3396 // If we asked for a non-typename and we got a type, error out, 3397 // but only if this is an instantiation of an unresolved using 3398 // decl. Otherwise just silently find the type name. 3399 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3400 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3401 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3402 UD->setInvalidDecl(); 3403 return UD; 3404 } 3405 } 3406 3407 // C++0x N2914 [namespace.udecl]p6: 3408 // A using-declaration shall not name a namespace. 3409 if (R.getAsSingle<NamespaceDecl>()) { 3410 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3411 << SS.getRange(); 3412 UD->setInvalidDecl(); 3413 return UD; 3414 } 3415 3416 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3417 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3418 BuildUsingShadowDecl(S, UD, *I); 3419 } 3420 3421 return UD; 3422} 3423 3424/// Checks that the given using declaration is not an invalid 3425/// redeclaration. Note that this is checking only for the using decl 3426/// itself, not for any ill-formedness among the UsingShadowDecls. 3427bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3428 bool isTypeName, 3429 const CXXScopeSpec &SS, 3430 SourceLocation NameLoc, 3431 const LookupResult &Prev) { 3432 // C++03 [namespace.udecl]p8: 3433 // C++0x [namespace.udecl]p10: 3434 // A using-declaration is a declaration and can therefore be used 3435 // repeatedly where (and only where) multiple declarations are 3436 // allowed. 3437 // That's only in file contexts. 3438 if (CurContext->getLookupContext()->isFileContext()) 3439 return false; 3440 3441 NestedNameSpecifier *Qual 3442 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3443 3444 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3445 NamedDecl *D = *I; 3446 3447 bool DTypename; 3448 NestedNameSpecifier *DQual; 3449 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3450 DTypename = UD->isTypeName(); 3451 DQual = UD->getTargetNestedNameDecl(); 3452 } else if (UnresolvedUsingValueDecl *UD 3453 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3454 DTypename = false; 3455 DQual = UD->getTargetNestedNameSpecifier(); 3456 } else if (UnresolvedUsingTypenameDecl *UD 3457 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3458 DTypename = true; 3459 DQual = UD->getTargetNestedNameSpecifier(); 3460 } else continue; 3461 3462 // using decls differ if one says 'typename' and the other doesn't. 3463 // FIXME: non-dependent using decls? 3464 if (isTypeName != DTypename) continue; 3465 3466 // using decls differ if they name different scopes (but note that 3467 // template instantiation can cause this check to trigger when it 3468 // didn't before instantiation). 3469 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3470 Context.getCanonicalNestedNameSpecifier(DQual)) 3471 continue; 3472 3473 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3474 Diag(D->getLocation(), diag::note_using_decl) << 1; 3475 return true; 3476 } 3477 3478 return false; 3479} 3480 3481 3482/// Checks that the given nested-name qualifier used in a using decl 3483/// in the current context is appropriately related to the current 3484/// scope. If an error is found, diagnoses it and returns true. 3485bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3486 const CXXScopeSpec &SS, 3487 SourceLocation NameLoc) { 3488 DeclContext *NamedContext = computeDeclContext(SS); 3489 3490 if (!CurContext->isRecord()) { 3491 // C++03 [namespace.udecl]p3: 3492 // C++0x [namespace.udecl]p8: 3493 // A using-declaration for a class member shall be a member-declaration. 3494 3495 // If we weren't able to compute a valid scope, it must be a 3496 // dependent class scope. 3497 if (!NamedContext || NamedContext->isRecord()) { 3498 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3499 << SS.getRange(); 3500 return true; 3501 } 3502 3503 // Otherwise, everything is known to be fine. 3504 return false; 3505 } 3506 3507 // The current scope is a record. 3508 3509 // If the named context is dependent, we can't decide much. 3510 if (!NamedContext) { 3511 // FIXME: in C++0x, we can diagnose if we can prove that the 3512 // nested-name-specifier does not refer to a base class, which is 3513 // still possible in some cases. 3514 3515 // Otherwise we have to conservatively report that things might be 3516 // okay. 3517 return false; 3518 } 3519 3520 if (!NamedContext->isRecord()) { 3521 // Ideally this would point at the last name in the specifier, 3522 // but we don't have that level of source info. 3523 Diag(SS.getRange().getBegin(), 3524 diag::err_using_decl_nested_name_specifier_is_not_class) 3525 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3526 return true; 3527 } 3528 3529 if (getLangOptions().CPlusPlus0x) { 3530 // C++0x [namespace.udecl]p3: 3531 // In a using-declaration used as a member-declaration, the 3532 // nested-name-specifier shall name a base class of the class 3533 // being defined. 3534 3535 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3536 cast<CXXRecordDecl>(NamedContext))) { 3537 if (CurContext == NamedContext) { 3538 Diag(NameLoc, 3539 diag::err_using_decl_nested_name_specifier_is_current_class) 3540 << SS.getRange(); 3541 return true; 3542 } 3543 3544 Diag(SS.getRange().getBegin(), 3545 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3546 << (NestedNameSpecifier*) SS.getScopeRep() 3547 << cast<CXXRecordDecl>(CurContext) 3548 << SS.getRange(); 3549 return true; 3550 } 3551 3552 return false; 3553 } 3554 3555 // C++03 [namespace.udecl]p4: 3556 // A using-declaration used as a member-declaration shall refer 3557 // to a member of a base class of the class being defined [etc.]. 3558 3559 // Salient point: SS doesn't have to name a base class as long as 3560 // lookup only finds members from base classes. Therefore we can 3561 // diagnose here only if we can prove that that can't happen, 3562 // i.e. if the class hierarchies provably don't intersect. 3563 3564 // TODO: it would be nice if "definitely valid" results were cached 3565 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3566 // need to be repeated. 3567 3568 struct UserData { 3569 llvm::DenseSet<const CXXRecordDecl*> Bases; 3570 3571 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3572 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3573 Data->Bases.insert(Base); 3574 return true; 3575 } 3576 3577 bool hasDependentBases(const CXXRecordDecl *Class) { 3578 return !Class->forallBases(collect, this); 3579 } 3580 3581 /// Returns true if the base is dependent or is one of the 3582 /// accumulated base classes. 3583 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3584 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3585 return !Data->Bases.count(Base); 3586 } 3587 3588 bool mightShareBases(const CXXRecordDecl *Class) { 3589 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3590 } 3591 }; 3592 3593 UserData Data; 3594 3595 // Returns false if we find a dependent base. 3596 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3597 return false; 3598 3599 // Returns false if the class has a dependent base or if it or one 3600 // of its bases is present in the base set of the current context. 3601 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3602 return false; 3603 3604 Diag(SS.getRange().getBegin(), 3605 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3606 << (NestedNameSpecifier*) SS.getScopeRep() 3607 << cast<CXXRecordDecl>(CurContext) 3608 << SS.getRange(); 3609 3610 return true; 3611} 3612 3613Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3614 SourceLocation NamespaceLoc, 3615 SourceLocation AliasLoc, 3616 IdentifierInfo *Alias, 3617 const CXXScopeSpec &SS, 3618 SourceLocation IdentLoc, 3619 IdentifierInfo *Ident) { 3620 3621 // Lookup the namespace name. 3622 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3623 LookupParsedName(R, S, &SS); 3624 3625 // Check if we have a previous declaration with the same name. 3626 if (NamedDecl *PrevDecl 3627 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3628 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3629 // We already have an alias with the same name that points to the same 3630 // namespace, so don't create a new one. 3631 if (!R.isAmbiguous() && !R.empty() && 3632 AD->getNamespace() == getNamespaceDecl(R.getFoundDecl())) 3633 return DeclPtrTy(); 3634 } 3635 3636 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3637 diag::err_redefinition_different_kind; 3638 Diag(AliasLoc, DiagID) << Alias; 3639 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3640 return DeclPtrTy(); 3641 } 3642 3643 if (R.isAmbiguous()) 3644 return DeclPtrTy(); 3645 3646 if (R.empty()) { 3647 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3648 return DeclPtrTy(); 3649 } 3650 3651 NamespaceAliasDecl *AliasDecl = 3652 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3653 Alias, SS.getRange(), 3654 (NestedNameSpecifier *)SS.getScopeRep(), 3655 IdentLoc, R.getFoundDecl()); 3656 3657 CurContext->addDecl(AliasDecl); 3658 return DeclPtrTy::make(AliasDecl); 3659} 3660 3661void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3662 CXXConstructorDecl *Constructor) { 3663 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3664 !Constructor->isUsed()) && 3665 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3666 3667 CXXRecordDecl *ClassDecl 3668 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3669 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3670 3671 if (SetBaseOrMemberInitializers(Constructor, 0, 0, true)) { 3672 Diag(CurrentLocation, diag::note_member_synthesized_at) 3673 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 3674 Constructor->setInvalidDecl(); 3675 } else { 3676 Constructor->setUsed(); 3677 } 3678} 3679 3680void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3681 CXXDestructorDecl *Destructor) { 3682 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3683 "DefineImplicitDestructor - call it for implicit default dtor"); 3684 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3685 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3686 // C++ [class.dtor] p5 3687 // Before the implicitly-declared default destructor for a class is 3688 // implicitly defined, all the implicitly-declared default destructors 3689 // for its base class and its non-static data members shall have been 3690 // implicitly defined. 3691 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3692 E = ClassDecl->bases_end(); Base != E; ++Base) { 3693 CXXRecordDecl *BaseClassDecl 3694 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3695 if (!BaseClassDecl->hasTrivialDestructor()) { 3696 if (CXXDestructorDecl *BaseDtor = 3697 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 3698 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 3699 else 3700 assert(false && 3701 "DefineImplicitDestructor - missing dtor in a base class"); 3702 } 3703 } 3704 3705 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3706 E = ClassDecl->field_end(); Field != E; ++Field) { 3707 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3708 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3709 FieldType = Array->getElementType(); 3710 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3711 CXXRecordDecl *FieldClassDecl 3712 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3713 if (!FieldClassDecl->hasTrivialDestructor()) { 3714 if (CXXDestructorDecl *FieldDtor = 3715 const_cast<CXXDestructorDecl*>( 3716 FieldClassDecl->getDestructor(Context))) 3717 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 3718 else 3719 assert(false && 3720 "DefineImplicitDestructor - missing dtor in class of a data member"); 3721 } 3722 } 3723 } 3724 3725 // FIXME: If CheckDestructor fails, we should emit a note about where the 3726 // implicit destructor was needed. 3727 if (CheckDestructor(Destructor)) { 3728 Diag(CurrentLocation, diag::note_member_synthesized_at) 3729 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3730 3731 Destructor->setInvalidDecl(); 3732 return; 3733 } 3734 3735 Destructor->setUsed(); 3736} 3737 3738void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3739 CXXMethodDecl *MethodDecl) { 3740 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3741 MethodDecl->getOverloadedOperator() == OO_Equal && 3742 !MethodDecl->isUsed()) && 3743 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3744 3745 CXXRecordDecl *ClassDecl 3746 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3747 3748 // C++[class.copy] p12 3749 // Before the implicitly-declared copy assignment operator for a class is 3750 // implicitly defined, all implicitly-declared copy assignment operators 3751 // for its direct base classes and its nonstatic data members shall have 3752 // been implicitly defined. 3753 bool err = false; 3754 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3755 E = ClassDecl->bases_end(); Base != E; ++Base) { 3756 CXXRecordDecl *BaseClassDecl 3757 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3758 if (CXXMethodDecl *BaseAssignOpMethod = 3759 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3760 BaseClassDecl)) 3761 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3762 } 3763 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3764 E = ClassDecl->field_end(); Field != E; ++Field) { 3765 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3766 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3767 FieldType = Array->getElementType(); 3768 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3769 CXXRecordDecl *FieldClassDecl 3770 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3771 if (CXXMethodDecl *FieldAssignOpMethod = 3772 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3773 FieldClassDecl)) 3774 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3775 } else if (FieldType->isReferenceType()) { 3776 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3777 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3778 Diag(Field->getLocation(), diag::note_declared_at); 3779 Diag(CurrentLocation, diag::note_first_required_here); 3780 err = true; 3781 } else if (FieldType.isConstQualified()) { 3782 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3783 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3784 Diag(Field->getLocation(), diag::note_declared_at); 3785 Diag(CurrentLocation, diag::note_first_required_here); 3786 err = true; 3787 } 3788 } 3789 if (!err) 3790 MethodDecl->setUsed(); 3791} 3792 3793CXXMethodDecl * 3794Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 3795 ParmVarDecl *ParmDecl, 3796 CXXRecordDecl *ClassDecl) { 3797 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3798 QualType RHSType(LHSType); 3799 // If class's assignment operator argument is const/volatile qualified, 3800 // look for operator = (const/volatile B&). Otherwise, look for 3801 // operator = (B&). 3802 RHSType = Context.getCVRQualifiedType(RHSType, 3803 ParmDecl->getType().getCVRQualifiers()); 3804 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3805 LHSType, 3806 SourceLocation())); 3807 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3808 RHSType, 3809 CurrentLocation)); 3810 Expr *Args[2] = { &*LHS, &*RHS }; 3811 OverloadCandidateSet CandidateSet; 3812 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3813 CandidateSet); 3814 OverloadCandidateSet::iterator Best; 3815 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 3816 return cast<CXXMethodDecl>(Best->Function); 3817 assert(false && 3818 "getAssignOperatorMethod - copy assignment operator method not found"); 3819 return 0; 3820} 3821 3822void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3823 CXXConstructorDecl *CopyConstructor, 3824 unsigned TypeQuals) { 3825 assert((CopyConstructor->isImplicit() && 3826 CopyConstructor->isCopyConstructor(TypeQuals) && 3827 !CopyConstructor->isUsed()) && 3828 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3829 3830 CXXRecordDecl *ClassDecl 3831 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3832 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3833 // C++ [class.copy] p209 3834 // Before the implicitly-declared copy constructor for a class is 3835 // implicitly defined, all the implicitly-declared copy constructors 3836 // for its base class and its non-static data members shall have been 3837 // implicitly defined. 3838 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3839 Base != ClassDecl->bases_end(); ++Base) { 3840 CXXRecordDecl *BaseClassDecl 3841 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3842 if (CXXConstructorDecl *BaseCopyCtor = 3843 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 3844 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3845 } 3846 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3847 FieldEnd = ClassDecl->field_end(); 3848 Field != FieldEnd; ++Field) { 3849 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3850 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3851 FieldType = Array->getElementType(); 3852 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3853 CXXRecordDecl *FieldClassDecl 3854 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3855 if (CXXConstructorDecl *FieldCopyCtor = 3856 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 3857 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3858 } 3859 } 3860 CopyConstructor->setUsed(); 3861} 3862 3863Sema::OwningExprResult 3864Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3865 CXXConstructorDecl *Constructor, 3866 MultiExprArg ExprArgs, 3867 bool RequiresZeroInit) { 3868 bool Elidable = false; 3869 3870 // C++ [class.copy]p15: 3871 // Whenever a temporary class object is copied using a copy constructor, and 3872 // this object and the copy have the same cv-unqualified type, an 3873 // implementation is permitted to treat the original and the copy as two 3874 // different ways of referring to the same object and not perform a copy at 3875 // all, even if the class copy constructor or destructor have side effects. 3876 3877 // FIXME: Is this enough? 3878 if (Constructor->isCopyConstructor()) { 3879 Expr *E = ((Expr **)ExprArgs.get())[0]; 3880 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3881 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3882 E = ICE->getSubExpr(); 3883 if (CXXFunctionalCastExpr *FCE = dyn_cast<CXXFunctionalCastExpr>(E)) 3884 E = FCE->getSubExpr(); 3885 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 3886 E = BE->getSubExpr(); 3887 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3888 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3889 E = ICE->getSubExpr(); 3890 3891 if (CallExpr *CE = dyn_cast<CallExpr>(E)) 3892 Elidable = !CE->getCallReturnType()->isReferenceType(); 3893 else if (isa<CXXTemporaryObjectExpr>(E)) 3894 Elidable = true; 3895 else if (isa<CXXConstructExpr>(E)) 3896 Elidable = true; 3897 } 3898 3899 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 3900 Elidable, move(ExprArgs), RequiresZeroInit); 3901} 3902 3903/// BuildCXXConstructExpr - Creates a complete call to a constructor, 3904/// including handling of its default argument expressions. 3905Sema::OwningExprResult 3906Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3907 CXXConstructorDecl *Constructor, bool Elidable, 3908 MultiExprArg ExprArgs, 3909 bool RequiresZeroInit) { 3910 unsigned NumExprs = ExprArgs.size(); 3911 Expr **Exprs = (Expr **)ExprArgs.release(); 3912 3913 MarkDeclarationReferenced(ConstructLoc, Constructor); 3914 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 3915 Constructor, Elidable, Exprs, NumExprs, 3916 RequiresZeroInit)); 3917} 3918 3919Sema::OwningExprResult 3920Sema::BuildCXXTemporaryObjectExpr(CXXConstructorDecl *Constructor, 3921 QualType Ty, 3922 SourceLocation TyBeginLoc, 3923 MultiExprArg Args, 3924 SourceLocation RParenLoc) { 3925 unsigned NumExprs = Args.size(); 3926 Expr **Exprs = (Expr **)Args.release(); 3927 3928 MarkDeclarationReferenced(TyBeginLoc, Constructor); 3929 return Owned(new (Context) CXXTemporaryObjectExpr(Context, Constructor, Ty, 3930 TyBeginLoc, Exprs, 3931 NumExprs, RParenLoc)); 3932} 3933 3934 3935bool Sema::InitializeVarWithConstructor(VarDecl *VD, 3936 CXXConstructorDecl *Constructor, 3937 MultiExprArg Exprs) { 3938 OwningExprResult TempResult = 3939 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 3940 move(Exprs)); 3941 if (TempResult.isInvalid()) 3942 return true; 3943 3944 Expr *Temp = TempResult.takeAs<Expr>(); 3945 MarkDeclarationReferenced(VD->getLocation(), Constructor); 3946 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 3947 VD->setInit(Context, Temp); 3948 3949 return false; 3950} 3951 3952void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) { 3953 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 3954 DeclInitType->getAs<RecordType>()->getDecl()); 3955 if (!ClassDecl->hasTrivialDestructor()) 3956 if (CXXDestructorDecl *Destructor = 3957 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 3958 MarkDeclarationReferenced(VD->getLocation(), Destructor); 3959} 3960 3961/// AddCXXDirectInitializerToDecl - This action is called immediately after 3962/// ActOnDeclarator, when a C++ direct initializer is present. 3963/// e.g: "int x(1);" 3964void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 3965 SourceLocation LParenLoc, 3966 MultiExprArg Exprs, 3967 SourceLocation *CommaLocs, 3968 SourceLocation RParenLoc) { 3969 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 3970 Decl *RealDecl = Dcl.getAs<Decl>(); 3971 3972 // If there is no declaration, there was an error parsing it. Just ignore 3973 // the initializer. 3974 if (RealDecl == 0) 3975 return; 3976 3977 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3978 if (!VDecl) { 3979 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3980 RealDecl->setInvalidDecl(); 3981 return; 3982 } 3983 3984 // We will represent direct-initialization similarly to copy-initialization: 3985 // int x(1); -as-> int x = 1; 3986 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 3987 // 3988 // Clients that want to distinguish between the two forms, can check for 3989 // direct initializer using VarDecl::hasCXXDirectInitializer(). 3990 // A major benefit is that clients that don't particularly care about which 3991 // exactly form was it (like the CodeGen) can handle both cases without 3992 // special case code. 3993 3994 // If either the declaration has a dependent type or if any of the expressions 3995 // is type-dependent, we represent the initialization via a ParenListExpr for 3996 // later use during template instantiation. 3997 if (VDecl->getType()->isDependentType() || 3998 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 3999 // Let clients know that initialization was done with a direct initializer. 4000 VDecl->setCXXDirectInitializer(true); 4001 4002 // Store the initialization expressions as a ParenListExpr. 4003 unsigned NumExprs = Exprs.size(); 4004 VDecl->setInit(Context, 4005 new (Context) ParenListExpr(Context, LParenLoc, 4006 (Expr **)Exprs.release(), 4007 NumExprs, RParenLoc)); 4008 return; 4009 } 4010 4011 4012 // C++ 8.5p11: 4013 // The form of initialization (using parentheses or '=') is generally 4014 // insignificant, but does matter when the entity being initialized has a 4015 // class type. 4016 QualType DeclInitType = VDecl->getType(); 4017 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4018 DeclInitType = Context.getBaseElementType(Array); 4019 4020 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4021 diag::err_typecheck_decl_incomplete_type)) { 4022 VDecl->setInvalidDecl(); 4023 return; 4024 } 4025 4026 // The variable can not have an abstract class type. 4027 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4028 diag::err_abstract_type_in_decl, 4029 AbstractVariableType)) 4030 VDecl->setInvalidDecl(); 4031 4032 const VarDecl *Def = 0; 4033 if (VDecl->getDefinition(Def)) { 4034 Diag(VDecl->getLocation(), diag::err_redefinition) 4035 << VDecl->getDeclName(); 4036 Diag(Def->getLocation(), diag::note_previous_definition); 4037 VDecl->setInvalidDecl(); 4038 return; 4039 } 4040 4041 // Capture the variable that is being initialized and the style of 4042 // initialization. 4043 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4044 4045 // FIXME: Poor source location information. 4046 InitializationKind Kind 4047 = InitializationKind::CreateDirect(VDecl->getLocation(), 4048 LParenLoc, RParenLoc); 4049 4050 InitializationSequence InitSeq(*this, Entity, Kind, 4051 (Expr**)Exprs.get(), Exprs.size()); 4052 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4053 if (Result.isInvalid()) { 4054 VDecl->setInvalidDecl(); 4055 return; 4056 } 4057 4058 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4059 VDecl->setInit(Context, Result.takeAs<Expr>()); 4060 VDecl->setCXXDirectInitializer(true); 4061 4062 if (VDecl->getType()->getAs<RecordType>()) 4063 FinalizeVarWithDestructor(VDecl, DeclInitType); 4064} 4065 4066/// \brief Add the applicable constructor candidates for an initialization 4067/// by constructor. 4068static void AddConstructorInitializationCandidates(Sema &SemaRef, 4069 QualType ClassType, 4070 Expr **Args, 4071 unsigned NumArgs, 4072 InitializationKind Kind, 4073 OverloadCandidateSet &CandidateSet) { 4074 // C++ [dcl.init]p14: 4075 // If the initialization is direct-initialization, or if it is 4076 // copy-initialization where the cv-unqualified version of the 4077 // source type is the same class as, or a derived class of, the 4078 // class of the destination, constructors are considered. The 4079 // applicable constructors are enumerated (13.3.1.3), and the 4080 // best one is chosen through overload resolution (13.3). The 4081 // constructor so selected is called to initialize the object, 4082 // with the initializer expression(s) as its argument(s). If no 4083 // constructor applies, or the overload resolution is ambiguous, 4084 // the initialization is ill-formed. 4085 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 4086 assert(ClassRec && "Can only initialize a class type here"); 4087 4088 // FIXME: When we decide not to synthesize the implicitly-declared 4089 // constructors, we'll need to make them appear here. 4090 4091 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 4092 DeclarationName ConstructorName 4093 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 4094 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 4095 DeclContext::lookup_const_iterator Con, ConEnd; 4096 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 4097 Con != ConEnd; ++Con) { 4098 // Find the constructor (which may be a template). 4099 CXXConstructorDecl *Constructor = 0; 4100 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 4101 if (ConstructorTmpl) 4102 Constructor 4103 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 4104 else 4105 Constructor = cast<CXXConstructorDecl>(*Con); 4106 4107 if ((Kind.getKind() == InitializationKind::IK_Direct) || 4108 (Kind.getKind() == InitializationKind::IK_Value) || 4109 (Kind.getKind() == InitializationKind::IK_Copy && 4110 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 4111 ((Kind.getKind() == InitializationKind::IK_Default) && 4112 Constructor->isDefaultConstructor())) { 4113 if (ConstructorTmpl) 4114 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, 4115 /*ExplicitArgs*/ 0, 4116 Args, NumArgs, CandidateSet); 4117 else 4118 SemaRef.AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 4119 } 4120 } 4121} 4122 4123/// \brief Attempt to perform initialization by constructor 4124/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 4125/// copy-initialization. 4126/// 4127/// This routine determines whether initialization by constructor is possible, 4128/// but it does not emit any diagnostics in the case where the initialization 4129/// is ill-formed. 4130/// 4131/// \param ClassType the type of the object being initialized, which must have 4132/// class type. 4133/// 4134/// \param Args the arguments provided to initialize the object 4135/// 4136/// \param NumArgs the number of arguments provided to initialize the object 4137/// 4138/// \param Kind the type of initialization being performed 4139/// 4140/// \returns the constructor used to initialize the object, if successful. 4141/// Otherwise, emits a diagnostic and returns NULL. 4142CXXConstructorDecl * 4143Sema::TryInitializationByConstructor(QualType ClassType, 4144 Expr **Args, unsigned NumArgs, 4145 SourceLocation Loc, 4146 InitializationKind Kind) { 4147 // Build the overload candidate set 4148 OverloadCandidateSet CandidateSet; 4149 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4150 CandidateSet); 4151 4152 // Determine whether we found a constructor we can use. 4153 OverloadCandidateSet::iterator Best; 4154 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4155 case OR_Success: 4156 case OR_Deleted: 4157 // We found a constructor. Return it. 4158 return cast<CXXConstructorDecl>(Best->Function); 4159 4160 case OR_No_Viable_Function: 4161 case OR_Ambiguous: 4162 // Overload resolution failed. Return nothing. 4163 return 0; 4164 } 4165 4166 // Silence GCC warning 4167 return 0; 4168} 4169 4170/// \brief Perform initialization by constructor (C++ [dcl.init]p14), which 4171/// may occur as part of direct-initialization or copy-initialization. 4172/// 4173/// \param ClassType the type of the object being initialized, which must have 4174/// class type. 4175/// 4176/// \param ArgsPtr the arguments provided to initialize the object 4177/// 4178/// \param Loc the source location where the initialization occurs 4179/// 4180/// \param Range the source range that covers the entire initialization 4181/// 4182/// \param InitEntity the name of the entity being initialized, if known 4183/// 4184/// \param Kind the type of initialization being performed 4185/// 4186/// \param ConvertedArgs a vector that will be filled in with the 4187/// appropriately-converted arguments to the constructor (if initialization 4188/// succeeded). 4189/// 4190/// \returns the constructor used to initialize the object, if successful. 4191/// Otherwise, emits a diagnostic and returns NULL. 4192CXXConstructorDecl * 4193Sema::PerformInitializationByConstructor(QualType ClassType, 4194 MultiExprArg ArgsPtr, 4195 SourceLocation Loc, SourceRange Range, 4196 DeclarationName InitEntity, 4197 InitializationKind Kind, 4198 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4199 4200 // Build the overload candidate set 4201 Expr **Args = (Expr **)ArgsPtr.get(); 4202 unsigned NumArgs = ArgsPtr.size(); 4203 OverloadCandidateSet CandidateSet; 4204 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4205 CandidateSet); 4206 4207 OverloadCandidateSet::iterator Best; 4208 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4209 case OR_Success: 4210 // We found a constructor. Break out so that we can convert the arguments 4211 // appropriately. 4212 break; 4213 4214 case OR_No_Viable_Function: 4215 if (InitEntity) 4216 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 4217 << InitEntity << Range; 4218 else 4219 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 4220 << ClassType << Range; 4221 PrintOverloadCandidates(CandidateSet, OCD_AllCandidates, Args, NumArgs); 4222 return 0; 4223 4224 case OR_Ambiguous: 4225 if (InitEntity) 4226 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 4227 else 4228 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 4229 PrintOverloadCandidates(CandidateSet, OCD_ViableCandidates, Args, NumArgs); 4230 return 0; 4231 4232 case OR_Deleted: 4233 if (InitEntity) 4234 Diag(Loc, diag::err_ovl_deleted_init) 4235 << Best->Function->isDeleted() 4236 << InitEntity << Range; 4237 else { 4238 const CXXRecordDecl *RD = 4239 cast<CXXRecordDecl>(ClassType->getAs<RecordType>()->getDecl()); 4240 Diag(Loc, diag::err_ovl_deleted_init) 4241 << Best->Function->isDeleted() 4242 << RD->getDeclName() << Range; 4243 } 4244 PrintOverloadCandidates(CandidateSet, OCD_AllCandidates, Args, NumArgs); 4245 return 0; 4246 } 4247 4248 // Convert the arguments, fill in default arguments, etc. 4249 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function); 4250 if (CompleteConstructorCall(Constructor, move(ArgsPtr), Loc, ConvertedArgs)) 4251 return 0; 4252 4253 return Constructor; 4254} 4255 4256/// \brief Given a constructor and the set of arguments provided for the 4257/// constructor, convert the arguments and add any required default arguments 4258/// to form a proper call to this constructor. 4259/// 4260/// \returns true if an error occurred, false otherwise. 4261bool 4262Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4263 MultiExprArg ArgsPtr, 4264 SourceLocation Loc, 4265 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4266 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4267 unsigned NumArgs = ArgsPtr.size(); 4268 Expr **Args = (Expr **)ArgsPtr.get(); 4269 4270 const FunctionProtoType *Proto 4271 = Constructor->getType()->getAs<FunctionProtoType>(); 4272 assert(Proto && "Constructor without a prototype?"); 4273 unsigned NumArgsInProto = Proto->getNumArgs(); 4274 4275 // If too few arguments are available, we'll fill in the rest with defaults. 4276 if (NumArgs < NumArgsInProto) 4277 ConvertedArgs.reserve(NumArgsInProto); 4278 else 4279 ConvertedArgs.reserve(NumArgs); 4280 4281 VariadicCallType CallType = 4282 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4283 llvm::SmallVector<Expr *, 8> AllArgs; 4284 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4285 Proto, 0, Args, NumArgs, AllArgs, 4286 CallType); 4287 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4288 ConvertedArgs.push_back(AllArgs[i]); 4289 return Invalid; 4290} 4291 4292/// CompareReferenceRelationship - Compare the two types T1 and T2 to 4293/// determine whether they are reference-related, 4294/// reference-compatible, reference-compatible with added 4295/// qualification, or incompatible, for use in C++ initialization by 4296/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 4297/// type, and the first type (T1) is the pointee type of the reference 4298/// type being initialized. 4299Sema::ReferenceCompareResult 4300Sema::CompareReferenceRelationship(SourceLocation Loc, 4301 QualType OrigT1, QualType OrigT2, 4302 bool& DerivedToBase) { 4303 assert(!OrigT1->isReferenceType() && 4304 "T1 must be the pointee type of the reference type"); 4305 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 4306 4307 QualType T1 = Context.getCanonicalType(OrigT1); 4308 QualType T2 = Context.getCanonicalType(OrigT2); 4309 Qualifiers T1Quals, T2Quals; 4310 QualType UnqualT1 = Context.getUnqualifiedArrayType(T1, T1Quals); 4311 QualType UnqualT2 = Context.getUnqualifiedArrayType(T2, T2Quals); 4312 4313 // C++ [dcl.init.ref]p4: 4314 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 4315 // reference-related to "cv2 T2" if T1 is the same type as T2, or 4316 // T1 is a base class of T2. 4317 if (UnqualT1 == UnqualT2) 4318 DerivedToBase = false; 4319 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 4320 !RequireCompleteType(Loc, OrigT2, PDiag()) && 4321 IsDerivedFrom(UnqualT2, UnqualT1)) 4322 DerivedToBase = true; 4323 else 4324 return Ref_Incompatible; 4325 4326 // At this point, we know that T1 and T2 are reference-related (at 4327 // least). 4328 4329 // If the type is an array type, promote the element qualifiers to the type 4330 // for comparison. 4331 if (isa<ArrayType>(T1) && T1Quals) 4332 T1 = Context.getQualifiedType(UnqualT1, T1Quals); 4333 if (isa<ArrayType>(T2) && T2Quals) 4334 T2 = Context.getQualifiedType(UnqualT2, T2Quals); 4335 4336 // C++ [dcl.init.ref]p4: 4337 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 4338 // reference-related to T2 and cv1 is the same cv-qualification 4339 // as, or greater cv-qualification than, cv2. For purposes of 4340 // overload resolution, cases for which cv1 is greater 4341 // cv-qualification than cv2 are identified as 4342 // reference-compatible with added qualification (see 13.3.3.2). 4343 if (T1Quals.getCVRQualifiers() == T2Quals.getCVRQualifiers()) 4344 return Ref_Compatible; 4345 else if (T1.isMoreQualifiedThan(T2)) 4346 return Ref_Compatible_With_Added_Qualification; 4347 else 4348 return Ref_Related; 4349} 4350 4351/// CheckReferenceInit - Check the initialization of a reference 4352/// variable with the given initializer (C++ [dcl.init.ref]). Init is 4353/// the initializer (either a simple initializer or an initializer 4354/// list), and DeclType is the type of the declaration. When ICS is 4355/// non-null, this routine will compute the implicit conversion 4356/// sequence according to C++ [over.ics.ref] and will not produce any 4357/// diagnostics; when ICS is null, it will emit diagnostics when any 4358/// errors are found. Either way, a return value of true indicates 4359/// that there was a failure, a return value of false indicates that 4360/// the reference initialization succeeded. 4361/// 4362/// When @p SuppressUserConversions, user-defined conversions are 4363/// suppressed. 4364/// When @p AllowExplicit, we also permit explicit user-defined 4365/// conversion functions. 4366/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 4367/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 4368/// This is used when this is called from a C-style cast. 4369bool 4370Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 4371 SourceLocation DeclLoc, 4372 bool SuppressUserConversions, 4373 bool AllowExplicit, bool ForceRValue, 4374 ImplicitConversionSequence *ICS, 4375 bool IgnoreBaseAccess) { 4376 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 4377 4378 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 4379 QualType T2 = Init->getType(); 4380 4381 // If the initializer is the address of an overloaded function, try 4382 // to resolve the overloaded function. If all goes well, T2 is the 4383 // type of the resulting function. 4384 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 4385 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 4386 ICS != 0); 4387 if (Fn) { 4388 // Since we're performing this reference-initialization for 4389 // real, update the initializer with the resulting function. 4390 if (!ICS) { 4391 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 4392 return true; 4393 4394 Init = FixOverloadedFunctionReference(Init, Fn); 4395 } 4396 4397 T2 = Fn->getType(); 4398 } 4399 } 4400 4401 // Compute some basic properties of the types and the initializer. 4402 bool isRValRef = DeclType->isRValueReferenceType(); 4403 bool DerivedToBase = false; 4404 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 4405 Init->isLvalue(Context); 4406 ReferenceCompareResult RefRelationship 4407 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 4408 4409 // Most paths end in a failed conversion. 4410 if (ICS) { 4411 ICS->setBad(); 4412 ICS->Bad.init(BadConversionSequence::no_conversion, Init, DeclType); 4413 } 4414 4415 // C++ [dcl.init.ref]p5: 4416 // A reference to type "cv1 T1" is initialized by an expression 4417 // of type "cv2 T2" as follows: 4418 4419 // -- If the initializer expression 4420 4421 // Rvalue references cannot bind to lvalues (N2812). 4422 // There is absolutely no situation where they can. In particular, note that 4423 // this is ill-formed, even if B has a user-defined conversion to A&&: 4424 // B b; 4425 // A&& r = b; 4426 if (isRValRef && InitLvalue == Expr::LV_Valid) { 4427 if (!ICS) 4428 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4429 << Init->getSourceRange(); 4430 return true; 4431 } 4432 4433 bool BindsDirectly = false; 4434 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 4435 // reference-compatible with "cv2 T2," or 4436 // 4437 // Note that the bit-field check is skipped if we are just computing 4438 // the implicit conversion sequence (C++ [over.best.ics]p2). 4439 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 4440 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4441 BindsDirectly = true; 4442 4443 if (ICS) { 4444 // C++ [over.ics.ref]p1: 4445 // When a parameter of reference type binds directly (8.5.3) 4446 // to an argument expression, the implicit conversion sequence 4447 // is the identity conversion, unless the argument expression 4448 // has a type that is a derived class of the parameter type, 4449 // in which case the implicit conversion sequence is a 4450 // derived-to-base Conversion (13.3.3.1). 4451 ICS->setStandard(); 4452 ICS->Standard.First = ICK_Identity; 4453 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4454 ICS->Standard.Third = ICK_Identity; 4455 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4456 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 4457 ICS->Standard.ReferenceBinding = true; 4458 ICS->Standard.DirectBinding = true; 4459 ICS->Standard.RRefBinding = false; 4460 ICS->Standard.CopyConstructor = 0; 4461 4462 // Nothing more to do: the inaccessibility/ambiguity check for 4463 // derived-to-base conversions is suppressed when we're 4464 // computing the implicit conversion sequence (C++ 4465 // [over.best.ics]p2). 4466 return false; 4467 } else { 4468 // Perform the conversion. 4469 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4470 if (DerivedToBase) 4471 CK = CastExpr::CK_DerivedToBase; 4472 else if(CheckExceptionSpecCompatibility(Init, T1)) 4473 return true; 4474 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 4475 } 4476 } 4477 4478 // -- has a class type (i.e., T2 is a class type) and can be 4479 // implicitly converted to an lvalue of type "cv3 T3," 4480 // where "cv1 T1" is reference-compatible with "cv3 T3" 4481 // 92) (this conversion is selected by enumerating the 4482 // applicable conversion functions (13.3.1.6) and choosing 4483 // the best one through overload resolution (13.3)), 4484 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 4485 !RequireCompleteType(DeclLoc, T2, 0)) { 4486 CXXRecordDecl *T2RecordDecl 4487 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 4488 4489 OverloadCandidateSet CandidateSet; 4490 const UnresolvedSetImpl *Conversions 4491 = T2RecordDecl->getVisibleConversionFunctions(); 4492 for (UnresolvedSetImpl::iterator I = Conversions->begin(), 4493 E = Conversions->end(); I != E; ++I) { 4494 NamedDecl *D = *I; 4495 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); 4496 if (isa<UsingShadowDecl>(D)) 4497 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 4498 4499 FunctionTemplateDecl *ConvTemplate 4500 = dyn_cast<FunctionTemplateDecl>(D); 4501 CXXConversionDecl *Conv; 4502 if (ConvTemplate) 4503 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 4504 else 4505 Conv = cast<CXXConversionDecl>(D); 4506 4507 // If the conversion function doesn't return a reference type, 4508 // it can't be considered for this conversion. 4509 if (Conv->getConversionType()->isLValueReferenceType() && 4510 (AllowExplicit || !Conv->isExplicit())) { 4511 if (ConvTemplate) 4512 AddTemplateConversionCandidate(ConvTemplate, ActingDC, 4513 Init, DeclType, CandidateSet); 4514 else 4515 AddConversionCandidate(Conv, ActingDC, Init, DeclType, CandidateSet); 4516 } 4517 } 4518 4519 OverloadCandidateSet::iterator Best; 4520 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 4521 case OR_Success: 4522 // This is a direct binding. 4523 BindsDirectly = true; 4524 4525 if (ICS) { 4526 // C++ [over.ics.ref]p1: 4527 // 4528 // [...] If the parameter binds directly to the result of 4529 // applying a conversion function to the argument 4530 // expression, the implicit conversion sequence is a 4531 // user-defined conversion sequence (13.3.3.1.2), with the 4532 // second standard conversion sequence either an identity 4533 // conversion or, if the conversion function returns an 4534 // entity of a type that is a derived class of the parameter 4535 // type, a derived-to-base Conversion. 4536 ICS->setUserDefined(); 4537 ICS->UserDefined.Before = Best->Conversions[0].Standard; 4538 ICS->UserDefined.After = Best->FinalConversion; 4539 ICS->UserDefined.ConversionFunction = Best->Function; 4540 ICS->UserDefined.EllipsisConversion = false; 4541 assert(ICS->UserDefined.After.ReferenceBinding && 4542 ICS->UserDefined.After.DirectBinding && 4543 "Expected a direct reference binding!"); 4544 return false; 4545 } else { 4546 OwningExprResult InitConversion = 4547 BuildCXXCastArgument(DeclLoc, QualType(), 4548 CastExpr::CK_UserDefinedConversion, 4549 cast<CXXMethodDecl>(Best->Function), 4550 Owned(Init)); 4551 Init = InitConversion.takeAs<Expr>(); 4552 4553 if (CheckExceptionSpecCompatibility(Init, T1)) 4554 return true; 4555 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 4556 /*isLvalue=*/true); 4557 } 4558 break; 4559 4560 case OR_Ambiguous: 4561 if (ICS) { 4562 ICS->setAmbiguous(); 4563 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 4564 Cand != CandidateSet.end(); ++Cand) 4565 if (Cand->Viable) 4566 ICS->Ambiguous.addConversion(Cand->Function); 4567 break; 4568 } 4569 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 4570 << Init->getSourceRange(); 4571 PrintOverloadCandidates(CandidateSet, OCD_ViableCandidates, &Init, 1); 4572 return true; 4573 4574 case OR_No_Viable_Function: 4575 case OR_Deleted: 4576 // There was no suitable conversion, or we found a deleted 4577 // conversion; continue with other checks. 4578 break; 4579 } 4580 } 4581 4582 if (BindsDirectly) { 4583 // C++ [dcl.init.ref]p4: 4584 // [...] In all cases where the reference-related or 4585 // reference-compatible relationship of two types is used to 4586 // establish the validity of a reference binding, and T1 is a 4587 // base class of T2, a program that necessitates such a binding 4588 // is ill-formed if T1 is an inaccessible (clause 11) or 4589 // ambiguous (10.2) base class of T2. 4590 // 4591 // Note that we only check this condition when we're allowed to 4592 // complain about errors, because we should not be checking for 4593 // ambiguity (or inaccessibility) unless the reference binding 4594 // actually happens. 4595 if (DerivedToBase) 4596 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 4597 Init->getSourceRange(), 4598 IgnoreBaseAccess); 4599 else 4600 return false; 4601 } 4602 4603 // -- Otherwise, the reference shall be to a non-volatile const 4604 // type (i.e., cv1 shall be const), or the reference shall be an 4605 // rvalue reference and the initializer expression shall be an rvalue. 4606 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4607 if (!ICS) 4608 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4609 << T1 << int(InitLvalue != Expr::LV_Valid) 4610 << T2 << Init->getSourceRange(); 4611 return true; 4612 } 4613 4614 // -- If the initializer expression is an rvalue, with T2 a 4615 // class type, and "cv1 T1" is reference-compatible with 4616 // "cv2 T2," the reference is bound in one of the 4617 // following ways (the choice is implementation-defined): 4618 // 4619 // -- The reference is bound to the object represented by 4620 // the rvalue (see 3.10) or to a sub-object within that 4621 // object. 4622 // 4623 // -- A temporary of type "cv1 T2" [sic] is created, and 4624 // a constructor is called to copy the entire rvalue 4625 // object into the temporary. The reference is bound to 4626 // the temporary or to a sub-object within the 4627 // temporary. 4628 // 4629 // The constructor that would be used to make the copy 4630 // shall be callable whether or not the copy is actually 4631 // done. 4632 // 4633 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4634 // freedom, so we will always take the first option and never build 4635 // a temporary in this case. FIXME: We will, however, have to check 4636 // for the presence of a copy constructor in C++98/03 mode. 4637 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4638 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4639 if (ICS) { 4640 ICS->setStandard(); 4641 ICS->Standard.First = ICK_Identity; 4642 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4643 ICS->Standard.Third = ICK_Identity; 4644 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4645 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 4646 ICS->Standard.ReferenceBinding = true; 4647 ICS->Standard.DirectBinding = false; 4648 ICS->Standard.RRefBinding = isRValRef; 4649 ICS->Standard.CopyConstructor = 0; 4650 } else { 4651 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4652 if (DerivedToBase) 4653 CK = CastExpr::CK_DerivedToBase; 4654 else if(CheckExceptionSpecCompatibility(Init, T1)) 4655 return true; 4656 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4657 } 4658 return false; 4659 } 4660 4661 // -- Otherwise, a temporary of type "cv1 T1" is created and 4662 // initialized from the initializer expression using the 4663 // rules for a non-reference copy initialization (8.5). The 4664 // reference is then bound to the temporary. If T1 is 4665 // reference-related to T2, cv1 must be the same 4666 // cv-qualification as, or greater cv-qualification than, 4667 // cv2; otherwise, the program is ill-formed. 4668 if (RefRelationship == Ref_Related) { 4669 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4670 // we would be reference-compatible or reference-compatible with 4671 // added qualification. But that wasn't the case, so the reference 4672 // initialization fails. 4673 if (!ICS) 4674 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4675 << T1 << int(InitLvalue != Expr::LV_Valid) 4676 << T2 << Init->getSourceRange(); 4677 return true; 4678 } 4679 4680 // If at least one of the types is a class type, the types are not 4681 // related, and we aren't allowed any user conversions, the 4682 // reference binding fails. This case is important for breaking 4683 // recursion, since TryImplicitConversion below will attempt to 4684 // create a temporary through the use of a copy constructor. 4685 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4686 (T1->isRecordType() || T2->isRecordType())) { 4687 if (!ICS) 4688 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4689 << DeclType << Init->getType() << AA_Initializing << Init->getSourceRange(); 4690 return true; 4691 } 4692 4693 // Actually try to convert the initializer to T1. 4694 if (ICS) { 4695 // C++ [over.ics.ref]p2: 4696 // 4697 // When a parameter of reference type is not bound directly to 4698 // an argument expression, the conversion sequence is the one 4699 // required to convert the argument expression to the 4700 // underlying type of the reference according to 4701 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4702 // to copy-initializing a temporary of the underlying type with 4703 // the argument expression. Any difference in top-level 4704 // cv-qualification is subsumed by the initialization itself 4705 // and does not constitute a conversion. 4706 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4707 /*AllowExplicit=*/false, 4708 /*ForceRValue=*/false, 4709 /*InOverloadResolution=*/false); 4710 4711 // Of course, that's still a reference binding. 4712 if (ICS->isStandard()) { 4713 ICS->Standard.ReferenceBinding = true; 4714 ICS->Standard.RRefBinding = isRValRef; 4715 } else if (ICS->isUserDefined()) { 4716 ICS->UserDefined.After.ReferenceBinding = true; 4717 ICS->UserDefined.After.RRefBinding = isRValRef; 4718 } 4719 return ICS->isBad(); 4720 } else { 4721 ImplicitConversionSequence Conversions; 4722 bool badConversion = PerformImplicitConversion(Init, T1, AA_Initializing, 4723 false, false, 4724 Conversions); 4725 if (badConversion) { 4726 if (Conversions.isAmbiguous()) { 4727 Diag(DeclLoc, 4728 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4729 for (int j = Conversions.Ambiguous.conversions().size()-1; 4730 j >= 0; j--) { 4731 FunctionDecl *Func = Conversions.Ambiguous.conversions()[j]; 4732 NoteOverloadCandidate(Func); 4733 } 4734 } 4735 else { 4736 if (isRValRef) 4737 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4738 << Init->getSourceRange(); 4739 else 4740 Diag(DeclLoc, diag::err_invalid_initialization) 4741 << DeclType << Init->getType() << Init->getSourceRange(); 4742 } 4743 } 4744 return badConversion; 4745 } 4746} 4747 4748static inline bool 4749CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4750 const FunctionDecl *FnDecl) { 4751 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4752 if (isa<NamespaceDecl>(DC)) { 4753 return SemaRef.Diag(FnDecl->getLocation(), 4754 diag::err_operator_new_delete_declared_in_namespace) 4755 << FnDecl->getDeclName(); 4756 } 4757 4758 if (isa<TranslationUnitDecl>(DC) && 4759 FnDecl->getStorageClass() == FunctionDecl::Static) { 4760 return SemaRef.Diag(FnDecl->getLocation(), 4761 diag::err_operator_new_delete_declared_static) 4762 << FnDecl->getDeclName(); 4763 } 4764 4765 return false; 4766} 4767 4768static inline bool 4769CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4770 CanQualType ExpectedResultType, 4771 CanQualType ExpectedFirstParamType, 4772 unsigned DependentParamTypeDiag, 4773 unsigned InvalidParamTypeDiag) { 4774 QualType ResultType = 4775 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4776 4777 // Check that the result type is not dependent. 4778 if (ResultType->isDependentType()) 4779 return SemaRef.Diag(FnDecl->getLocation(), 4780 diag::err_operator_new_delete_dependent_result_type) 4781 << FnDecl->getDeclName() << ExpectedResultType; 4782 4783 // Check that the result type is what we expect. 4784 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4785 return SemaRef.Diag(FnDecl->getLocation(), 4786 diag::err_operator_new_delete_invalid_result_type) 4787 << FnDecl->getDeclName() << ExpectedResultType; 4788 4789 // A function template must have at least 2 parameters. 4790 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4791 return SemaRef.Diag(FnDecl->getLocation(), 4792 diag::err_operator_new_delete_template_too_few_parameters) 4793 << FnDecl->getDeclName(); 4794 4795 // The function decl must have at least 1 parameter. 4796 if (FnDecl->getNumParams() == 0) 4797 return SemaRef.Diag(FnDecl->getLocation(), 4798 diag::err_operator_new_delete_too_few_parameters) 4799 << FnDecl->getDeclName(); 4800 4801 // Check the the first parameter type is not dependent. 4802 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4803 if (FirstParamType->isDependentType()) 4804 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4805 << FnDecl->getDeclName() << ExpectedFirstParamType; 4806 4807 // Check that the first parameter type is what we expect. 4808 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4809 ExpectedFirstParamType) 4810 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4811 << FnDecl->getDeclName() << ExpectedFirstParamType; 4812 4813 return false; 4814} 4815 4816static bool 4817CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4818 // C++ [basic.stc.dynamic.allocation]p1: 4819 // A program is ill-formed if an allocation function is declared in a 4820 // namespace scope other than global scope or declared static in global 4821 // scope. 4822 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4823 return true; 4824 4825 CanQualType SizeTy = 4826 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4827 4828 // C++ [basic.stc.dynamic.allocation]p1: 4829 // The return type shall be void*. The first parameter shall have type 4830 // std::size_t. 4831 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4832 SizeTy, 4833 diag::err_operator_new_dependent_param_type, 4834 diag::err_operator_new_param_type)) 4835 return true; 4836 4837 // C++ [basic.stc.dynamic.allocation]p1: 4838 // The first parameter shall not have an associated default argument. 4839 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4840 return SemaRef.Diag(FnDecl->getLocation(), 4841 diag::err_operator_new_default_arg) 4842 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4843 4844 return false; 4845} 4846 4847static bool 4848CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4849 // C++ [basic.stc.dynamic.deallocation]p1: 4850 // A program is ill-formed if deallocation functions are declared in a 4851 // namespace scope other than global scope or declared static in global 4852 // scope. 4853 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4854 return true; 4855 4856 // C++ [basic.stc.dynamic.deallocation]p2: 4857 // Each deallocation function shall return void and its first parameter 4858 // shall be void*. 4859 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4860 SemaRef.Context.VoidPtrTy, 4861 diag::err_operator_delete_dependent_param_type, 4862 diag::err_operator_delete_param_type)) 4863 return true; 4864 4865 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4866 if (FirstParamType->isDependentType()) 4867 return SemaRef.Diag(FnDecl->getLocation(), 4868 diag::err_operator_delete_dependent_param_type) 4869 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4870 4871 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4872 SemaRef.Context.VoidPtrTy) 4873 return SemaRef.Diag(FnDecl->getLocation(), 4874 diag::err_operator_delete_param_type) 4875 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4876 4877 return false; 4878} 4879 4880/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4881/// of this overloaded operator is well-formed. If so, returns false; 4882/// otherwise, emits appropriate diagnostics and returns true. 4883bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4884 assert(FnDecl && FnDecl->isOverloadedOperator() && 4885 "Expected an overloaded operator declaration"); 4886 4887 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4888 4889 // C++ [over.oper]p5: 4890 // The allocation and deallocation functions, operator new, 4891 // operator new[], operator delete and operator delete[], are 4892 // described completely in 3.7.3. The attributes and restrictions 4893 // found in the rest of this subclause do not apply to them unless 4894 // explicitly stated in 3.7.3. 4895 if (Op == OO_Delete || Op == OO_Array_Delete) 4896 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4897 4898 if (Op == OO_New || Op == OO_Array_New) 4899 return CheckOperatorNewDeclaration(*this, FnDecl); 4900 4901 // C++ [over.oper]p6: 4902 // An operator function shall either be a non-static member 4903 // function or be a non-member function and have at least one 4904 // parameter whose type is a class, a reference to a class, an 4905 // enumeration, or a reference to an enumeration. 4906 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4907 if (MethodDecl->isStatic()) 4908 return Diag(FnDecl->getLocation(), 4909 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4910 } else { 4911 bool ClassOrEnumParam = false; 4912 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4913 ParamEnd = FnDecl->param_end(); 4914 Param != ParamEnd; ++Param) { 4915 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4916 if (ParamType->isDependentType() || ParamType->isRecordType() || 4917 ParamType->isEnumeralType()) { 4918 ClassOrEnumParam = true; 4919 break; 4920 } 4921 } 4922 4923 if (!ClassOrEnumParam) 4924 return Diag(FnDecl->getLocation(), 4925 diag::err_operator_overload_needs_class_or_enum) 4926 << FnDecl->getDeclName(); 4927 } 4928 4929 // C++ [over.oper]p8: 4930 // An operator function cannot have default arguments (8.3.6), 4931 // except where explicitly stated below. 4932 // 4933 // Only the function-call operator allows default arguments 4934 // (C++ [over.call]p1). 4935 if (Op != OO_Call) { 4936 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4937 Param != FnDecl->param_end(); ++Param) { 4938 if ((*Param)->hasDefaultArg()) 4939 return Diag((*Param)->getLocation(), 4940 diag::err_operator_overload_default_arg) 4941 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4942 } 4943 } 4944 4945 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4946 { false, false, false } 4947#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4948 , { Unary, Binary, MemberOnly } 4949#include "clang/Basic/OperatorKinds.def" 4950 }; 4951 4952 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4953 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4954 bool MustBeMemberOperator = OperatorUses[Op][2]; 4955 4956 // C++ [over.oper]p8: 4957 // [...] Operator functions cannot have more or fewer parameters 4958 // than the number required for the corresponding operator, as 4959 // described in the rest of this subclause. 4960 unsigned NumParams = FnDecl->getNumParams() 4961 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4962 if (Op != OO_Call && 4963 ((NumParams == 1 && !CanBeUnaryOperator) || 4964 (NumParams == 2 && !CanBeBinaryOperator) || 4965 (NumParams < 1) || (NumParams > 2))) { 4966 // We have the wrong number of parameters. 4967 unsigned ErrorKind; 4968 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4969 ErrorKind = 2; // 2 -> unary or binary. 4970 } else if (CanBeUnaryOperator) { 4971 ErrorKind = 0; // 0 -> unary 4972 } else { 4973 assert(CanBeBinaryOperator && 4974 "All non-call overloaded operators are unary or binary!"); 4975 ErrorKind = 1; // 1 -> binary 4976 } 4977 4978 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4979 << FnDecl->getDeclName() << NumParams << ErrorKind; 4980 } 4981 4982 // Overloaded operators other than operator() cannot be variadic. 4983 if (Op != OO_Call && 4984 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4985 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4986 << FnDecl->getDeclName(); 4987 } 4988 4989 // Some operators must be non-static member functions. 4990 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4991 return Diag(FnDecl->getLocation(), 4992 diag::err_operator_overload_must_be_member) 4993 << FnDecl->getDeclName(); 4994 } 4995 4996 // C++ [over.inc]p1: 4997 // The user-defined function called operator++ implements the 4998 // prefix and postfix ++ operator. If this function is a member 4999 // function with no parameters, or a non-member function with one 5000 // parameter of class or enumeration type, it defines the prefix 5001 // increment operator ++ for objects of that type. If the function 5002 // is a member function with one parameter (which shall be of type 5003 // int) or a non-member function with two parameters (the second 5004 // of which shall be of type int), it defines the postfix 5005 // increment operator ++ for objects of that type. 5006 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5007 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5008 bool ParamIsInt = false; 5009 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5010 ParamIsInt = BT->getKind() == BuiltinType::Int; 5011 5012 if (!ParamIsInt) 5013 return Diag(LastParam->getLocation(), 5014 diag::err_operator_overload_post_incdec_must_be_int) 5015 << LastParam->getType() << (Op == OO_MinusMinus); 5016 } 5017 5018 // Notify the class if it got an assignment operator. 5019 if (Op == OO_Equal) { 5020 // Would have returned earlier otherwise. 5021 assert(isa<CXXMethodDecl>(FnDecl) && 5022 "Overloaded = not member, but not filtered."); 5023 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5024 Method->getParent()->addedAssignmentOperator(Context, Method); 5025 } 5026 5027 return false; 5028} 5029 5030/// CheckLiteralOperatorDeclaration - Check whether the declaration 5031/// of this literal operator function is well-formed. If so, returns 5032/// false; otherwise, emits appropriate diagnostics and returns true. 5033bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5034 DeclContext *DC = FnDecl->getDeclContext(); 5035 Decl::Kind Kind = DC->getDeclKind(); 5036 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5037 Kind != Decl::LinkageSpec) { 5038 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5039 << FnDecl->getDeclName(); 5040 return true; 5041 } 5042 5043 bool Valid = false; 5044 5045 // FIXME: Check for the one valid template signature 5046 // template <char...> type operator "" name(); 5047 5048 if (FunctionDecl::param_iterator Param = FnDecl->param_begin()) { 5049 // Check the first parameter 5050 QualType T = (*Param)->getType(); 5051 5052 // unsigned long long int and long double are allowed, but only 5053 // alone. 5054 // We also allow any character type; their omission seems to be a bug 5055 // in n3000 5056 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5057 Context.hasSameType(T, Context.LongDoubleTy) || 5058 Context.hasSameType(T, Context.CharTy) || 5059 Context.hasSameType(T, Context.WCharTy) || 5060 Context.hasSameType(T, Context.Char16Ty) || 5061 Context.hasSameType(T, Context.Char32Ty)) { 5062 if (++Param == FnDecl->param_end()) 5063 Valid = true; 5064 goto FinishedParams; 5065 } 5066 5067 // Otherwise it must be a pointer to const; let's strip those. 5068 const PointerType *PT = T->getAs<PointerType>(); 5069 if (!PT) 5070 goto FinishedParams; 5071 T = PT->getPointeeType(); 5072 if (!T.isConstQualified()) 5073 goto FinishedParams; 5074 T = T.getUnqualifiedType(); 5075 5076 // Move on to the second parameter; 5077 ++Param; 5078 5079 // If there is no second parameter, the first must be a const char * 5080 if (Param == FnDecl->param_end()) { 5081 if (Context.hasSameType(T, Context.CharTy)) 5082 Valid = true; 5083 goto FinishedParams; 5084 } 5085 5086 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5087 // are allowed as the first parameter to a two-parameter function 5088 if (!(Context.hasSameType(T, Context.CharTy) || 5089 Context.hasSameType(T, Context.WCharTy) || 5090 Context.hasSameType(T, Context.Char16Ty) || 5091 Context.hasSameType(T, Context.Char32Ty))) 5092 goto FinishedParams; 5093 5094 // The second and final parameter must be an std::size_t 5095 T = (*Param)->getType().getUnqualifiedType(); 5096 if (Context.hasSameType(T, Context.getSizeType()) && 5097 ++Param == FnDecl->param_end()) 5098 Valid = true; 5099 } 5100 5101 // FIXME: This diagnostic is absolutely terrible. 5102FinishedParams: 5103 if (!Valid) { 5104 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5105 << FnDecl->getDeclName(); 5106 return true; 5107 } 5108 5109 return false; 5110} 5111 5112/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5113/// linkage specification, including the language and (if present) 5114/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5115/// the location of the language string literal, which is provided 5116/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5117/// the '{' brace. Otherwise, this linkage specification does not 5118/// have any braces. 5119Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5120 SourceLocation ExternLoc, 5121 SourceLocation LangLoc, 5122 const char *Lang, 5123 unsigned StrSize, 5124 SourceLocation LBraceLoc) { 5125 LinkageSpecDecl::LanguageIDs Language; 5126 if (strncmp(Lang, "\"C\"", StrSize) == 0) 5127 Language = LinkageSpecDecl::lang_c; 5128 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 5129 Language = LinkageSpecDecl::lang_cxx; 5130 else { 5131 Diag(LangLoc, diag::err_bad_language); 5132 return DeclPtrTy(); 5133 } 5134 5135 // FIXME: Add all the various semantics of linkage specifications 5136 5137 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5138 LangLoc, Language, 5139 LBraceLoc.isValid()); 5140 CurContext->addDecl(D); 5141 PushDeclContext(S, D); 5142 return DeclPtrTy::make(D); 5143} 5144 5145/// ActOnFinishLinkageSpecification - Completely the definition of 5146/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5147/// valid, it's the position of the closing '}' brace in a linkage 5148/// specification that uses braces. 5149Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5150 DeclPtrTy LinkageSpec, 5151 SourceLocation RBraceLoc) { 5152 if (LinkageSpec) 5153 PopDeclContext(); 5154 return LinkageSpec; 5155} 5156 5157/// \brief Perform semantic analysis for the variable declaration that 5158/// occurs within a C++ catch clause, returning the newly-created 5159/// variable. 5160VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5161 TypeSourceInfo *TInfo, 5162 IdentifierInfo *Name, 5163 SourceLocation Loc, 5164 SourceRange Range) { 5165 bool Invalid = false; 5166 5167 // Arrays and functions decay. 5168 if (ExDeclType->isArrayType()) 5169 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5170 else if (ExDeclType->isFunctionType()) 5171 ExDeclType = Context.getPointerType(ExDeclType); 5172 5173 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5174 // The exception-declaration shall not denote a pointer or reference to an 5175 // incomplete type, other than [cv] void*. 5176 // N2844 forbids rvalue references. 5177 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5178 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5179 Invalid = true; 5180 } 5181 5182 QualType BaseType = ExDeclType; 5183 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5184 unsigned DK = diag::err_catch_incomplete; 5185 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5186 BaseType = Ptr->getPointeeType(); 5187 Mode = 1; 5188 DK = diag::err_catch_incomplete_ptr; 5189 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5190 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5191 BaseType = Ref->getPointeeType(); 5192 Mode = 2; 5193 DK = diag::err_catch_incomplete_ref; 5194 } 5195 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5196 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 5197 Invalid = true; 5198 5199 if (!Invalid && !ExDeclType->isDependentType() && 5200 RequireNonAbstractType(Loc, ExDeclType, 5201 diag::err_abstract_type_in_decl, 5202 AbstractVariableType)) 5203 Invalid = true; 5204 5205 // FIXME: Need to test for ability to copy-construct and destroy the 5206 // exception variable. 5207 5208 // FIXME: Need to check for abstract classes. 5209 5210 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5211 Name, ExDeclType, TInfo, VarDecl::None); 5212 5213 if (Invalid) 5214 ExDecl->setInvalidDecl(); 5215 5216 return ExDecl; 5217} 5218 5219/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5220/// handler. 5221Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5222 TypeSourceInfo *TInfo = 0; 5223 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5224 5225 bool Invalid = D.isInvalidType(); 5226 IdentifierInfo *II = D.getIdentifier(); 5227 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 5228 // The scope should be freshly made just for us. There is just no way 5229 // it contains any previous declaration. 5230 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5231 if (PrevDecl->isTemplateParameter()) { 5232 // Maybe we will complain about the shadowed template parameter. 5233 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5234 } 5235 } 5236 5237 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5238 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5239 << D.getCXXScopeSpec().getRange(); 5240 Invalid = true; 5241 } 5242 5243 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5244 D.getIdentifier(), 5245 D.getIdentifierLoc(), 5246 D.getDeclSpec().getSourceRange()); 5247 5248 if (Invalid) 5249 ExDecl->setInvalidDecl(); 5250 5251 // Add the exception declaration into this scope. 5252 if (II) 5253 PushOnScopeChains(ExDecl, S); 5254 else 5255 CurContext->addDecl(ExDecl); 5256 5257 ProcessDeclAttributes(S, ExDecl, D); 5258 return DeclPtrTy::make(ExDecl); 5259} 5260 5261Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5262 ExprArg assertexpr, 5263 ExprArg assertmessageexpr) { 5264 Expr *AssertExpr = (Expr *)assertexpr.get(); 5265 StringLiteral *AssertMessage = 5266 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5267 5268 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5269 llvm::APSInt Value(32); 5270 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5271 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5272 AssertExpr->getSourceRange(); 5273 return DeclPtrTy(); 5274 } 5275 5276 if (Value == 0) { 5277 Diag(AssertLoc, diag::err_static_assert_failed) 5278 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5279 } 5280 } 5281 5282 assertexpr.release(); 5283 assertmessageexpr.release(); 5284 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5285 AssertExpr, AssertMessage); 5286 5287 CurContext->addDecl(Decl); 5288 return DeclPtrTy::make(Decl); 5289} 5290 5291/// Handle a friend type declaration. This works in tandem with 5292/// ActOnTag. 5293/// 5294/// Notes on friend class templates: 5295/// 5296/// We generally treat friend class declarations as if they were 5297/// declaring a class. So, for example, the elaborated type specifier 5298/// in a friend declaration is required to obey the restrictions of a 5299/// class-head (i.e. no typedefs in the scope chain), template 5300/// parameters are required to match up with simple template-ids, &c. 5301/// However, unlike when declaring a template specialization, it's 5302/// okay to refer to a template specialization without an empty 5303/// template parameter declaration, e.g. 5304/// friend class A<T>::B<unsigned>; 5305/// We permit this as a special case; if there are any template 5306/// parameters present at all, require proper matching, i.e. 5307/// template <> template <class T> friend class A<int>::B; 5308Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5309 MultiTemplateParamsArg TempParams) { 5310 SourceLocation Loc = DS.getSourceRange().getBegin(); 5311 5312 assert(DS.isFriendSpecified()); 5313 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5314 5315 // Try to convert the decl specifier to a type. This works for 5316 // friend templates because ActOnTag never produces a ClassTemplateDecl 5317 // for a TUK_Friend. 5318 Declarator TheDeclarator(DS, Declarator::MemberContext); 5319 QualType T = GetTypeForDeclarator(TheDeclarator, S); 5320 if (TheDeclarator.isInvalidType()) 5321 return DeclPtrTy(); 5322 5323 // This is definitely an error in C++98. It's probably meant to 5324 // be forbidden in C++0x, too, but the specification is just 5325 // poorly written. 5326 // 5327 // The problem is with declarations like the following: 5328 // template <T> friend A<T>::foo; 5329 // where deciding whether a class C is a friend or not now hinges 5330 // on whether there exists an instantiation of A that causes 5331 // 'foo' to equal C. There are restrictions on class-heads 5332 // (which we declare (by fiat) elaborated friend declarations to 5333 // be) that makes this tractable. 5334 // 5335 // FIXME: handle "template <> friend class A<T>;", which 5336 // is possibly well-formed? Who even knows? 5337 if (TempParams.size() && !isa<ElaboratedType>(T)) { 5338 Diag(Loc, diag::err_tagless_friend_type_template) 5339 << DS.getSourceRange(); 5340 return DeclPtrTy(); 5341 } 5342 5343 // C++ [class.friend]p2: 5344 // An elaborated-type-specifier shall be used in a friend declaration 5345 // for a class.* 5346 // * The class-key of the elaborated-type-specifier is required. 5347 // This is one of the rare places in Clang where it's legitimate to 5348 // ask about the "spelling" of the type. 5349 if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) { 5350 // If we evaluated the type to a record type, suggest putting 5351 // a tag in front. 5352 if (const RecordType *RT = T->getAs<RecordType>()) { 5353 RecordDecl *RD = RT->getDecl(); 5354 5355 std::string InsertionText = std::string(" ") + RD->getKindName(); 5356 5357 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 5358 << (unsigned) RD->getTagKind() 5359 << T 5360 << SourceRange(DS.getFriendSpecLoc()) 5361 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 5362 InsertionText); 5363 return DeclPtrTy(); 5364 }else { 5365 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 5366 << DS.getSourceRange(); 5367 return DeclPtrTy(); 5368 } 5369 } 5370 5371 // Enum types cannot be friends. 5372 if (T->getAs<EnumType>()) { 5373 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 5374 << SourceRange(DS.getFriendSpecLoc()); 5375 return DeclPtrTy(); 5376 } 5377 5378 // C++98 [class.friend]p1: A friend of a class is a function 5379 // or class that is not a member of the class . . . 5380 // This is fixed in DR77, which just barely didn't make the C++03 5381 // deadline. It's also a very silly restriction that seriously 5382 // affects inner classes and which nobody else seems to implement; 5383 // thus we never diagnose it, not even in -pedantic. 5384 5385 Decl *D; 5386 if (TempParams.size()) 5387 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5388 TempParams.size(), 5389 (TemplateParameterList**) TempParams.release(), 5390 T.getTypePtr(), 5391 DS.getFriendSpecLoc()); 5392 else 5393 D = FriendDecl::Create(Context, CurContext, Loc, T.getTypePtr(), 5394 DS.getFriendSpecLoc()); 5395 D->setAccess(AS_public); 5396 CurContext->addDecl(D); 5397 5398 return DeclPtrTy::make(D); 5399} 5400 5401Sema::DeclPtrTy 5402Sema::ActOnFriendFunctionDecl(Scope *S, 5403 Declarator &D, 5404 bool IsDefinition, 5405 MultiTemplateParamsArg TemplateParams) { 5406 const DeclSpec &DS = D.getDeclSpec(); 5407 5408 assert(DS.isFriendSpecified()); 5409 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5410 5411 SourceLocation Loc = D.getIdentifierLoc(); 5412 TypeSourceInfo *TInfo = 0; 5413 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5414 5415 // C++ [class.friend]p1 5416 // A friend of a class is a function or class.... 5417 // Note that this sees through typedefs, which is intended. 5418 // It *doesn't* see through dependent types, which is correct 5419 // according to [temp.arg.type]p3: 5420 // If a declaration acquires a function type through a 5421 // type dependent on a template-parameter and this causes 5422 // a declaration that does not use the syntactic form of a 5423 // function declarator to have a function type, the program 5424 // is ill-formed. 5425 if (!T->isFunctionType()) { 5426 Diag(Loc, diag::err_unexpected_friend); 5427 5428 // It might be worthwhile to try to recover by creating an 5429 // appropriate declaration. 5430 return DeclPtrTy(); 5431 } 5432 5433 // C++ [namespace.memdef]p3 5434 // - If a friend declaration in a non-local class first declares a 5435 // class or function, the friend class or function is a member 5436 // of the innermost enclosing namespace. 5437 // - The name of the friend is not found by simple name lookup 5438 // until a matching declaration is provided in that namespace 5439 // scope (either before or after the class declaration granting 5440 // friendship). 5441 // - If a friend function is called, its name may be found by the 5442 // name lookup that considers functions from namespaces and 5443 // classes associated with the types of the function arguments. 5444 // - When looking for a prior declaration of a class or a function 5445 // declared as a friend, scopes outside the innermost enclosing 5446 // namespace scope are not considered. 5447 5448 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5449 DeclarationName Name = GetNameForDeclarator(D); 5450 assert(Name); 5451 5452 // The context we found the declaration in, or in which we should 5453 // create the declaration. 5454 DeclContext *DC; 5455 5456 // FIXME: handle local classes 5457 5458 // Recover from invalid scope qualifiers as if they just weren't there. 5459 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5460 ForRedeclaration); 5461 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5462 // FIXME: RequireCompleteDeclContext 5463 DC = computeDeclContext(ScopeQual); 5464 5465 // FIXME: handle dependent contexts 5466 if (!DC) return DeclPtrTy(); 5467 5468 LookupQualifiedName(Previous, DC); 5469 5470 // If searching in that context implicitly found a declaration in 5471 // a different context, treat it like it wasn't found at all. 5472 // TODO: better diagnostics for this case. Suggesting the right 5473 // qualified scope would be nice... 5474 // FIXME: getRepresentativeDecl() is not right here at all 5475 if (Previous.empty() || 5476 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5477 D.setInvalidType(); 5478 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5479 return DeclPtrTy(); 5480 } 5481 5482 // C++ [class.friend]p1: A friend of a class is a function or 5483 // class that is not a member of the class . . . 5484 if (DC->Equals(CurContext)) 5485 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5486 5487 // Otherwise walk out to the nearest namespace scope looking for matches. 5488 } else { 5489 // TODO: handle local class contexts. 5490 5491 DC = CurContext; 5492 while (true) { 5493 // Skip class contexts. If someone can cite chapter and verse 5494 // for this behavior, that would be nice --- it's what GCC and 5495 // EDG do, and it seems like a reasonable intent, but the spec 5496 // really only says that checks for unqualified existing 5497 // declarations should stop at the nearest enclosing namespace, 5498 // not that they should only consider the nearest enclosing 5499 // namespace. 5500 while (DC->isRecord()) 5501 DC = DC->getParent(); 5502 5503 LookupQualifiedName(Previous, DC); 5504 5505 // TODO: decide what we think about using declarations. 5506 if (!Previous.empty()) 5507 break; 5508 5509 if (DC->isFileContext()) break; 5510 DC = DC->getParent(); 5511 } 5512 5513 // C++ [class.friend]p1: A friend of a class is a function or 5514 // class that is not a member of the class . . . 5515 // C++0x changes this for both friend types and functions. 5516 // Most C++ 98 compilers do seem to give an error here, so 5517 // we do, too. 5518 if (!Previous.empty() && DC->Equals(CurContext) 5519 && !getLangOptions().CPlusPlus0x) 5520 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5521 } 5522 5523 if (DC->isFileContext()) { 5524 // This implies that it has to be an operator or function. 5525 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5526 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5527 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5528 Diag(Loc, diag::err_introducing_special_friend) << 5529 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5530 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5531 return DeclPtrTy(); 5532 } 5533 } 5534 5535 bool Redeclaration = false; 5536 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5537 move(TemplateParams), 5538 IsDefinition, 5539 Redeclaration); 5540 if (!ND) return DeclPtrTy(); 5541 5542 assert(ND->getDeclContext() == DC); 5543 assert(ND->getLexicalDeclContext() == CurContext); 5544 5545 // Add the function declaration to the appropriate lookup tables, 5546 // adjusting the redeclarations list as necessary. We don't 5547 // want to do this yet if the friending class is dependent. 5548 // 5549 // Also update the scope-based lookup if the target context's 5550 // lookup context is in lexical scope. 5551 if (!CurContext->isDependentContext()) { 5552 DC = DC->getLookupContext(); 5553 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5554 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5555 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5556 } 5557 5558 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5559 D.getIdentifierLoc(), ND, 5560 DS.getFriendSpecLoc()); 5561 FrD->setAccess(AS_public); 5562 CurContext->addDecl(FrD); 5563 5564 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) 5565 FrD->setSpecialization(true); 5566 5567 return DeclPtrTy::make(ND); 5568} 5569 5570void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5571 AdjustDeclIfTemplate(dcl); 5572 5573 Decl *Dcl = dcl.getAs<Decl>(); 5574 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5575 if (!Fn) { 5576 Diag(DelLoc, diag::err_deleted_non_function); 5577 return; 5578 } 5579 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5580 Diag(DelLoc, diag::err_deleted_decl_not_first); 5581 Diag(Prev->getLocation(), diag::note_previous_declaration); 5582 // If the declaration wasn't the first, we delete the function anyway for 5583 // recovery. 5584 } 5585 Fn->setDeleted(); 5586} 5587 5588static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5589 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5590 ++CI) { 5591 Stmt *SubStmt = *CI; 5592 if (!SubStmt) 5593 continue; 5594 if (isa<ReturnStmt>(SubStmt)) 5595 Self.Diag(SubStmt->getSourceRange().getBegin(), 5596 diag::err_return_in_constructor_handler); 5597 if (!isa<Expr>(SubStmt)) 5598 SearchForReturnInStmt(Self, SubStmt); 5599 } 5600} 5601 5602void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5603 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5604 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5605 SearchForReturnInStmt(*this, Handler); 5606 } 5607} 5608 5609bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5610 const CXXMethodDecl *Old) { 5611 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5612 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5613 5614 if (Context.hasSameType(NewTy, OldTy)) 5615 return false; 5616 5617 // Check if the return types are covariant 5618 QualType NewClassTy, OldClassTy; 5619 5620 /// Both types must be pointers or references to classes. 5621 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5622 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5623 NewClassTy = NewPT->getPointeeType(); 5624 OldClassTy = OldPT->getPointeeType(); 5625 } 5626 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5627 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5628 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5629 NewClassTy = NewRT->getPointeeType(); 5630 OldClassTy = OldRT->getPointeeType(); 5631 } 5632 } 5633 } 5634 5635 // The return types aren't either both pointers or references to a class type. 5636 if (NewClassTy.isNull()) { 5637 Diag(New->getLocation(), 5638 diag::err_different_return_type_for_overriding_virtual_function) 5639 << New->getDeclName() << NewTy << OldTy; 5640 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5641 5642 return true; 5643 } 5644 5645 // C++ [class.virtual]p6: 5646 // If the return type of D::f differs from the return type of B::f, the 5647 // class type in the return type of D::f shall be complete at the point of 5648 // declaration of D::f or shall be the class type D. 5649 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5650 if (!RT->isBeingDefined() && 5651 RequireCompleteType(New->getLocation(), NewClassTy, 5652 PDiag(diag::err_covariant_return_incomplete) 5653 << New->getDeclName())) 5654 return true; 5655 } 5656 5657 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5658 // Check if the new class derives from the old class. 5659 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5660 Diag(New->getLocation(), 5661 diag::err_covariant_return_not_derived) 5662 << New->getDeclName() << NewTy << OldTy; 5663 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5664 return true; 5665 } 5666 5667 // Check if we the conversion from derived to base is valid. 5668 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5669 diag::err_covariant_return_inaccessible_base, 5670 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5671 // FIXME: Should this point to the return type? 5672 New->getLocation(), SourceRange(), New->getDeclName())) { 5673 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5674 return true; 5675 } 5676 } 5677 5678 // The qualifiers of the return types must be the same. 5679 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5680 Diag(New->getLocation(), 5681 diag::err_covariant_return_type_different_qualifications) 5682 << New->getDeclName() << NewTy << OldTy; 5683 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5684 return true; 5685 }; 5686 5687 5688 // The new class type must have the same or less qualifiers as the old type. 5689 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5690 Diag(New->getLocation(), 5691 diag::err_covariant_return_type_class_type_more_qualified) 5692 << New->getDeclName() << NewTy << OldTy; 5693 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5694 return true; 5695 }; 5696 5697 return false; 5698} 5699 5700bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5701 const CXXMethodDecl *Old) 5702{ 5703 if (Old->hasAttr<FinalAttr>()) { 5704 Diag(New->getLocation(), diag::err_final_function_overridden) 5705 << New->getDeclName(); 5706 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5707 return true; 5708 } 5709 5710 return false; 5711} 5712 5713/// \brief Mark the given method pure. 5714/// 5715/// \param Method the method to be marked pure. 5716/// 5717/// \param InitRange the source range that covers the "0" initializer. 5718bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5719 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5720 Method->setPure(); 5721 5722 // A class is abstract if at least one function is pure virtual. 5723 Method->getParent()->setAbstract(true); 5724 return false; 5725 } 5726 5727 if (!Method->isInvalidDecl()) 5728 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5729 << Method->getDeclName() << InitRange; 5730 return true; 5731} 5732 5733/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5734/// an initializer for the out-of-line declaration 'Dcl'. The scope 5735/// is a fresh scope pushed for just this purpose. 5736/// 5737/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5738/// static data member of class X, names should be looked up in the scope of 5739/// class X. 5740void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5741 // If there is no declaration, there was an error parsing it. 5742 Decl *D = Dcl.getAs<Decl>(); 5743 if (D == 0) return; 5744 5745 // We should only get called for declarations with scope specifiers, like: 5746 // int foo::bar; 5747 assert(D->isOutOfLine()); 5748 EnterDeclaratorContext(S, D->getDeclContext()); 5749} 5750 5751/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5752/// initializer for the out-of-line declaration 'Dcl'. 5753void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5754 // If there is no declaration, there was an error parsing it. 5755 Decl *D = Dcl.getAs<Decl>(); 5756 if (D == 0) return; 5757 5758 assert(D->isOutOfLine()); 5759 ExitDeclaratorContext(S); 5760} 5761 5762/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5763/// C++ if/switch/while/for statement. 5764/// e.g: "if (int x = f()) {...}" 5765Action::DeclResult 5766Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5767 // C++ 6.4p2: 5768 // The declarator shall not specify a function or an array. 5769 // The type-specifier-seq shall not contain typedef and shall not declare a 5770 // new class or enumeration. 5771 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5772 "Parser allowed 'typedef' as storage class of condition decl."); 5773 5774 TypeSourceInfo *TInfo = 0; 5775 TagDecl *OwnedTag = 0; 5776 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5777 5778 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5779 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5780 // would be created and CXXConditionDeclExpr wants a VarDecl. 5781 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5782 << D.getSourceRange(); 5783 return DeclResult(); 5784 } else if (OwnedTag && OwnedTag->isDefinition()) { 5785 // The type-specifier-seq shall not declare a new class or enumeration. 5786 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5787 } 5788 5789 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5790 if (!Dcl) 5791 return DeclResult(); 5792 5793 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5794 VD->setDeclaredInCondition(true); 5795 return Dcl; 5796} 5797 5798void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5799 CXXMethodDecl *MD) { 5800 // Ignore dependent types. 5801 if (MD->isDependentContext()) 5802 return; 5803 5804 CXXRecordDecl *RD = MD->getParent(); 5805 5806 // Ignore classes without a vtable. 5807 if (!RD->isDynamicClass()) 5808 return; 5809 5810 // Ignore declarations that are not definitions. 5811 if (!MD->isThisDeclarationADefinition()) 5812 return; 5813 5814 if (isa<CXXConstructorDecl>(MD)) { 5815 switch (MD->getParent()->getTemplateSpecializationKind()) { 5816 case TSK_Undeclared: 5817 case TSK_ExplicitSpecialization: 5818 // Classes that aren't instantiations of templates don't need their 5819 // virtual methods marked until we see the definition of the key 5820 // function. 5821 return; 5822 5823 case TSK_ImplicitInstantiation: 5824 case TSK_ExplicitInstantiationDeclaration: 5825 case TSK_ExplicitInstantiationDefinition: 5826 // This is a constructor of a class template; mark all of the virtual 5827 // members as referenced to ensure that they get instantiatied. 5828 break; 5829 } 5830 } else if (!MD->isOutOfLine()) { 5831 // Consider only out-of-line definitions of member functions. When we see 5832 // an inline definition, it's too early to compute the key function. 5833 return; 5834 } else if (const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD)) { 5835 // If this is not the key function, we don't need to mark virtual members. 5836 if (KeyFunction->getCanonicalDecl() != MD->getCanonicalDecl()) 5837 return; 5838 } else { 5839 // The class has no key function, so we've already noted that we need to 5840 // mark the virtual members of this class. 5841 return; 5842 } 5843 5844 // We will need to mark all of the virtual members as referenced to build the 5845 // vtable. 5846 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 5847} 5848 5849bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5850 if (ClassesWithUnmarkedVirtualMembers.empty()) 5851 return false; 5852 5853 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 5854 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 5855 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 5856 ClassesWithUnmarkedVirtualMembers.pop_back(); 5857 MarkVirtualMembersReferenced(Loc, RD); 5858 } 5859 5860 return true; 5861} 5862 5863void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, CXXRecordDecl *RD) { 5864 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5865 e = RD->method_end(); i != e; ++i) { 5866 CXXMethodDecl *MD = *i; 5867 5868 // C++ [basic.def.odr]p2: 5869 // [...] A virtual member function is used if it is not pure. [...] 5870 if (MD->isVirtual() && !MD->isPure()) 5871 MarkDeclarationReferenced(Loc, MD); 5872 } 5873} 5874 5875