SemaDeclCXX.cpp revision 2d5b70386d6f5553b667b6e407ca781b4ca2009e
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 && CurDecl->getIdentifier()) 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(); 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(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 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 684 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 685} 686 687/// \brief Determine whether the type \p Derived is a C++ class that is 688/// derived from the type \p Base. 689bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 690 if (!getLangOptions().CPlusPlus) 691 return false; 692 693 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 694 if (!DerivedRT) 695 return false; 696 697 const RecordType *BaseRT = Base->getAs<RecordType>(); 698 if (!BaseRT) 699 return false; 700 701 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 702 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 703 return DerivedRD->isDerivedFrom(BaseRD, Paths); 704} 705 706/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 707/// conversion (where Derived and Base are class types) is 708/// well-formed, meaning that the conversion is unambiguous (and 709/// that all of the base classes are accessible). Returns true 710/// and emits a diagnostic if the code is ill-formed, returns false 711/// otherwise. Loc is the location where this routine should point to 712/// if there is an error, and Range is the source range to highlight 713/// if there is an error. 714bool 715Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 716 AccessDiagnosticsKind ADK, 717 unsigned AmbigiousBaseConvID, 718 SourceLocation Loc, SourceRange Range, 719 DeclarationName Name) { 720 // First, determine whether the path from Derived to Base is 721 // ambiguous. This is slightly more expensive than checking whether 722 // the Derived to Base conversion exists, because here we need to 723 // explore multiple paths to determine if there is an ambiguity. 724 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 725 /*DetectVirtual=*/false); 726 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 727 assert(DerivationOkay && 728 "Can only be used with a derived-to-base conversion"); 729 (void)DerivationOkay; 730 731 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 732 if (ADK == ADK_quiet) 733 return false; 734 735 // Check that the base class can be accessed. 736 switch (CheckBaseClassAccess(Loc, /*IsBaseToDerived*/ false, 737 Base, Derived, Paths.front(), 738 /*force*/ false, 739 /*unprivileged*/ false, 740 ADK)) { 741 case AR_accessible: return false; 742 case AR_inaccessible: return true; 743 case AR_dependent: return false; 744 case AR_delayed: return false; 745 } 746 } 747 748 // We know that the derived-to-base conversion is ambiguous, and 749 // we're going to produce a diagnostic. Perform the derived-to-base 750 // search just one more time to compute all of the possible paths so 751 // that we can print them out. This is more expensive than any of 752 // the previous derived-to-base checks we've done, but at this point 753 // performance isn't as much of an issue. 754 Paths.clear(); 755 Paths.setRecordingPaths(true); 756 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 757 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 758 (void)StillOkay; 759 760 // Build up a textual representation of the ambiguous paths, e.g., 761 // D -> B -> A, that will be used to illustrate the ambiguous 762 // conversions in the diagnostic. We only print one of the paths 763 // to each base class subobject. 764 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 765 766 Diag(Loc, AmbigiousBaseConvID) 767 << Derived << Base << PathDisplayStr << Range << Name; 768 return true; 769} 770 771bool 772Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 773 SourceLocation Loc, SourceRange Range, 774 bool IgnoreAccess) { 775 return CheckDerivedToBaseConversion(Derived, Base, 776 IgnoreAccess ? ADK_quiet : ADK_normal, 777 diag::err_ambiguous_derived_to_base_conv, 778 Loc, Range, DeclarationName()); 779} 780 781 782/// @brief Builds a string representing ambiguous paths from a 783/// specific derived class to different subobjects of the same base 784/// class. 785/// 786/// This function builds a string that can be used in error messages 787/// to show the different paths that one can take through the 788/// inheritance hierarchy to go from the derived class to different 789/// subobjects of a base class. The result looks something like this: 790/// @code 791/// struct D -> struct B -> struct A 792/// struct D -> struct C -> struct A 793/// @endcode 794std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 795 std::string PathDisplayStr; 796 std::set<unsigned> DisplayedPaths; 797 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 798 Path != Paths.end(); ++Path) { 799 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 800 // We haven't displayed a path to this particular base 801 // class subobject yet. 802 PathDisplayStr += "\n "; 803 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 804 for (CXXBasePath::const_iterator Element = Path->begin(); 805 Element != Path->end(); ++Element) 806 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 807 } 808 } 809 810 return PathDisplayStr; 811} 812 813//===----------------------------------------------------------------------===// 814// C++ class member Handling 815//===----------------------------------------------------------------------===// 816 817/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 818/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 819/// bitfield width if there is one and 'InitExpr' specifies the initializer if 820/// any. 821Sema::DeclPtrTy 822Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 823 MultiTemplateParamsArg TemplateParameterLists, 824 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 825 bool Deleted) { 826 const DeclSpec &DS = D.getDeclSpec(); 827 DeclarationName Name = GetNameForDeclarator(D); 828 Expr *BitWidth = static_cast<Expr*>(BW); 829 Expr *Init = static_cast<Expr*>(InitExpr); 830 SourceLocation Loc = D.getIdentifierLoc(); 831 832 bool isFunc = D.isFunctionDeclarator(); 833 834 assert(!DS.isFriendSpecified()); 835 836 // C++ 9.2p6: A member shall not be declared to have automatic storage 837 // duration (auto, register) or with the extern storage-class-specifier. 838 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 839 // data members and cannot be applied to names declared const or static, 840 // and cannot be applied to reference members. 841 switch (DS.getStorageClassSpec()) { 842 case DeclSpec::SCS_unspecified: 843 case DeclSpec::SCS_typedef: 844 case DeclSpec::SCS_static: 845 // FALL THROUGH. 846 break; 847 case DeclSpec::SCS_mutable: 848 if (isFunc) { 849 if (DS.getStorageClassSpecLoc().isValid()) 850 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 851 else 852 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 853 854 // FIXME: It would be nicer if the keyword was ignored only for this 855 // declarator. Otherwise we could get follow-up errors. 856 D.getMutableDeclSpec().ClearStorageClassSpecs(); 857 } else { 858 QualType T = GetTypeForDeclarator(D, S); 859 diag::kind err = static_cast<diag::kind>(0); 860 if (T->isReferenceType()) 861 err = diag::err_mutable_reference; 862 else if (T.isConstQualified()) 863 err = diag::err_mutable_const; 864 if (err != 0) { 865 if (DS.getStorageClassSpecLoc().isValid()) 866 Diag(DS.getStorageClassSpecLoc(), err); 867 else 868 Diag(DS.getThreadSpecLoc(), err); 869 // FIXME: It would be nicer if the keyword was ignored only for this 870 // declarator. Otherwise we could get follow-up errors. 871 D.getMutableDeclSpec().ClearStorageClassSpecs(); 872 } 873 } 874 break; 875 default: 876 if (DS.getStorageClassSpecLoc().isValid()) 877 Diag(DS.getStorageClassSpecLoc(), 878 diag::err_storageclass_invalid_for_member); 879 else 880 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 881 D.getMutableDeclSpec().ClearStorageClassSpecs(); 882 } 883 884 if (!isFunc && 885 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 886 D.getNumTypeObjects() == 0) { 887 // Check also for this case: 888 // 889 // typedef int f(); 890 // f a; 891 // 892 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 893 isFunc = TDType->isFunctionType(); 894 } 895 896 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 897 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 898 !isFunc); 899 900 Decl *Member; 901 if (isInstField) { 902 // FIXME: Check for template parameters! 903 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 904 AS); 905 assert(Member && "HandleField never returns null"); 906 } else { 907 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 908 .getAs<Decl>(); 909 if (!Member) { 910 if (BitWidth) DeleteExpr(BitWidth); 911 return DeclPtrTy(); 912 } 913 914 // Non-instance-fields can't have a bitfield. 915 if (BitWidth) { 916 if (Member->isInvalidDecl()) { 917 // don't emit another diagnostic. 918 } else if (isa<VarDecl>(Member)) { 919 // C++ 9.6p3: A bit-field shall not be a static member. 920 // "static member 'A' cannot be a bit-field" 921 Diag(Loc, diag::err_static_not_bitfield) 922 << Name << BitWidth->getSourceRange(); 923 } else if (isa<TypedefDecl>(Member)) { 924 // "typedef member 'x' cannot be a bit-field" 925 Diag(Loc, diag::err_typedef_not_bitfield) 926 << Name << BitWidth->getSourceRange(); 927 } else { 928 // A function typedef ("typedef int f(); f a;"). 929 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 930 Diag(Loc, diag::err_not_integral_type_bitfield) 931 << Name << cast<ValueDecl>(Member)->getType() 932 << BitWidth->getSourceRange(); 933 } 934 935 DeleteExpr(BitWidth); 936 BitWidth = 0; 937 Member->setInvalidDecl(); 938 } 939 940 Member->setAccess(AS); 941 942 // If we have declared a member function template, set the access of the 943 // templated declaration as well. 944 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 945 FunTmpl->getTemplatedDecl()->setAccess(AS); 946 } 947 948 assert((Name || isInstField) && "No identifier for non-field ?"); 949 950 if (Init) 951 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 952 if (Deleted) // FIXME: Source location is not very good. 953 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 954 955 if (isInstField) { 956 FieldCollector->Add(cast<FieldDecl>(Member)); 957 return DeclPtrTy(); 958 } 959 return DeclPtrTy::make(Member); 960} 961 962/// \brief Find the direct and/or virtual base specifiers that 963/// correspond to the given base type, for use in base initialization 964/// within a constructor. 965static bool FindBaseInitializer(Sema &SemaRef, 966 CXXRecordDecl *ClassDecl, 967 QualType BaseType, 968 const CXXBaseSpecifier *&DirectBaseSpec, 969 const CXXBaseSpecifier *&VirtualBaseSpec) { 970 // First, check for a direct base class. 971 DirectBaseSpec = 0; 972 for (CXXRecordDecl::base_class_const_iterator Base 973 = ClassDecl->bases_begin(); 974 Base != ClassDecl->bases_end(); ++Base) { 975 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 976 // We found a direct base of this type. That's what we're 977 // initializing. 978 DirectBaseSpec = &*Base; 979 break; 980 } 981 } 982 983 // Check for a virtual base class. 984 // FIXME: We might be able to short-circuit this if we know in advance that 985 // there are no virtual bases. 986 VirtualBaseSpec = 0; 987 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 988 // We haven't found a base yet; search the class hierarchy for a 989 // virtual base class. 990 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 991 /*DetectVirtual=*/false); 992 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 993 BaseType, Paths)) { 994 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 995 Path != Paths.end(); ++Path) { 996 if (Path->back().Base->isVirtual()) { 997 VirtualBaseSpec = Path->back().Base; 998 break; 999 } 1000 } 1001 } 1002 } 1003 1004 return DirectBaseSpec || VirtualBaseSpec; 1005} 1006 1007/// ActOnMemInitializer - Handle a C++ member initializer. 1008Sema::MemInitResult 1009Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1010 Scope *S, 1011 const CXXScopeSpec &SS, 1012 IdentifierInfo *MemberOrBase, 1013 TypeTy *TemplateTypeTy, 1014 SourceLocation IdLoc, 1015 SourceLocation LParenLoc, 1016 ExprTy **Args, unsigned NumArgs, 1017 SourceLocation *CommaLocs, 1018 SourceLocation RParenLoc) { 1019 if (!ConstructorD) 1020 return true; 1021 1022 AdjustDeclIfTemplate(ConstructorD); 1023 1024 CXXConstructorDecl *Constructor 1025 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1026 if (!Constructor) { 1027 // The user wrote a constructor initializer on a function that is 1028 // not a C++ constructor. Ignore the error for now, because we may 1029 // have more member initializers coming; we'll diagnose it just 1030 // once in ActOnMemInitializers. 1031 return true; 1032 } 1033 1034 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1035 1036 // C++ [class.base.init]p2: 1037 // Names in a mem-initializer-id are looked up in the scope of the 1038 // constructor’s class and, if not found in that scope, are looked 1039 // up in the scope containing the constructor’s 1040 // definition. [Note: if the constructor’s class contains a member 1041 // with the same name as a direct or virtual base class of the 1042 // class, a mem-initializer-id naming the member or base class and 1043 // composed of a single identifier refers to the class member. A 1044 // mem-initializer-id for the hidden base class may be specified 1045 // using a qualified name. ] 1046 if (!SS.getScopeRep() && !TemplateTypeTy) { 1047 // Look for a member, first. 1048 FieldDecl *Member = 0; 1049 DeclContext::lookup_result Result 1050 = ClassDecl->lookup(MemberOrBase); 1051 if (Result.first != Result.second) 1052 Member = dyn_cast<FieldDecl>(*Result.first); 1053 1054 // FIXME: Handle members of an anonymous union. 1055 1056 if (Member) 1057 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1058 LParenLoc, RParenLoc); 1059 } 1060 // It didn't name a member, so see if it names a class. 1061 QualType BaseType; 1062 TypeSourceInfo *TInfo = 0; 1063 1064 if (TemplateTypeTy) { 1065 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1066 } else { 1067 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1068 LookupParsedName(R, S, &SS); 1069 1070 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1071 if (!TyD) { 1072 if (R.isAmbiguous()) return true; 1073 1074 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1075 bool NotUnknownSpecialization = false; 1076 DeclContext *DC = computeDeclContext(SS, false); 1077 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1078 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1079 1080 if (!NotUnknownSpecialization) { 1081 // When the scope specifier can refer to a member of an unknown 1082 // specialization, we take it as a type name. 1083 BaseType = CheckTypenameType((NestedNameSpecifier *)SS.getScopeRep(), 1084 *MemberOrBase, SS.getRange()); 1085 R.clear(); 1086 } 1087 } 1088 1089 // If no results were found, try to correct typos. 1090 if (R.empty() && BaseType.isNull() && 1091 CorrectTypo(R, S, &SS, ClassDecl) && R.isSingleResult()) { 1092 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1093 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1094 // We have found a non-static data member with a similar 1095 // name to what was typed; complain and initialize that 1096 // member. 1097 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1098 << MemberOrBase << true << R.getLookupName() 1099 << CodeModificationHint::CreateReplacement(R.getNameLoc(), 1100 R.getLookupName().getAsString()); 1101 Diag(Member->getLocation(), diag::note_previous_decl) 1102 << Member->getDeclName(); 1103 1104 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1105 LParenLoc, RParenLoc); 1106 } 1107 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1108 const CXXBaseSpecifier *DirectBaseSpec; 1109 const CXXBaseSpecifier *VirtualBaseSpec; 1110 if (FindBaseInitializer(*this, ClassDecl, 1111 Context.getTypeDeclType(Type), 1112 DirectBaseSpec, VirtualBaseSpec)) { 1113 // We have found a direct or virtual base class with a 1114 // similar name to what was typed; complain and initialize 1115 // that base class. 1116 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1117 << MemberOrBase << false << R.getLookupName() 1118 << CodeModificationHint::CreateReplacement(R.getNameLoc(), 1119 R.getLookupName().getAsString()); 1120 1121 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1122 : VirtualBaseSpec; 1123 Diag(BaseSpec->getSourceRange().getBegin(), 1124 diag::note_base_class_specified_here) 1125 << BaseSpec->getType() 1126 << BaseSpec->getSourceRange(); 1127 1128 TyD = Type; 1129 } 1130 } 1131 } 1132 1133 if (!TyD && BaseType.isNull()) { 1134 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1135 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1136 return true; 1137 } 1138 } 1139 1140 if (BaseType.isNull()) { 1141 BaseType = Context.getTypeDeclType(TyD); 1142 if (SS.isSet()) { 1143 NestedNameSpecifier *Qualifier = 1144 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1145 1146 // FIXME: preserve source range information 1147 BaseType = Context.getQualifiedNameType(Qualifier, BaseType); 1148 } 1149 } 1150 } 1151 1152 if (!TInfo) 1153 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1154 1155 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1156 LParenLoc, RParenLoc, ClassDecl); 1157} 1158 1159/// Checks an initializer expression for use of uninitialized fields, such as 1160/// containing the field that is being initialized. Returns true if there is an 1161/// uninitialized field was used an updates the SourceLocation parameter; false 1162/// otherwise. 1163static bool InitExprContainsUninitializedFields(const Stmt* S, 1164 const FieldDecl* LhsField, 1165 SourceLocation* L) { 1166 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1167 if (ME) { 1168 const NamedDecl* RhsField = ME->getMemberDecl(); 1169 if (RhsField == LhsField) { 1170 // Initializing a field with itself. Throw a warning. 1171 // But wait; there are exceptions! 1172 // Exception #1: The field may not belong to this record. 1173 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1174 const Expr* base = ME->getBase(); 1175 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1176 // Even though the field matches, it does not belong to this record. 1177 return false; 1178 } 1179 // None of the exceptions triggered; return true to indicate an 1180 // uninitialized field was used. 1181 *L = ME->getMemberLoc(); 1182 return true; 1183 } 1184 } 1185 bool found = false; 1186 for (Stmt::const_child_iterator it = S->child_begin(); 1187 it != S->child_end() && found == false; 1188 ++it) { 1189 if (isa<CallExpr>(S)) { 1190 // Do not descend into function calls or constructors, as the use 1191 // of an uninitialized field may be valid. One would have to inspect 1192 // the contents of the function/ctor to determine if it is safe or not. 1193 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1194 // may be safe, depending on what the function/ctor does. 1195 continue; 1196 } 1197 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1198 } 1199 return found; 1200} 1201 1202Sema::MemInitResult 1203Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1204 unsigned NumArgs, SourceLocation IdLoc, 1205 SourceLocation LParenLoc, 1206 SourceLocation RParenLoc) { 1207 // Diagnose value-uses of fields to initialize themselves, e.g. 1208 // foo(foo) 1209 // where foo is not also a parameter to the constructor. 1210 // TODO: implement -Wuninitialized and fold this into that framework. 1211 for (unsigned i = 0; i < NumArgs; ++i) { 1212 SourceLocation L; 1213 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1214 // FIXME: Return true in the case when other fields are used before being 1215 // uninitialized. For example, let this field be the i'th field. When 1216 // initializing the i'th field, throw a warning if any of the >= i'th 1217 // fields are used, as they are not yet initialized. 1218 // Right now we are only handling the case where the i'th field uses 1219 // itself in its initializer. 1220 Diag(L, diag::warn_field_is_uninit); 1221 } 1222 } 1223 1224 bool HasDependentArg = false; 1225 for (unsigned i = 0; i < NumArgs; i++) 1226 HasDependentArg |= Args[i]->isTypeDependent(); 1227 1228 QualType FieldType = Member->getType(); 1229 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1230 FieldType = Array->getElementType(); 1231 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1232 if (FieldType->isDependentType() || HasDependentArg) { 1233 // Can't check initialization for a member of dependent type or when 1234 // any of the arguments are type-dependent expressions. 1235 OwningExprResult Init 1236 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1237 RParenLoc)); 1238 1239 // Erase any temporaries within this evaluation context; we're not 1240 // going to track them in the AST, since we'll be rebuilding the 1241 // ASTs during template instantiation. 1242 ExprTemporaries.erase( 1243 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1244 ExprTemporaries.end()); 1245 1246 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1247 LParenLoc, 1248 Init.takeAs<Expr>(), 1249 RParenLoc); 1250 1251 } 1252 1253 if (Member->isInvalidDecl()) 1254 return true; 1255 1256 // Initialize the member. 1257 InitializedEntity MemberEntity = 1258 InitializedEntity::InitializeMember(Member, 0); 1259 InitializationKind Kind = 1260 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1261 1262 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1263 1264 OwningExprResult MemberInit = 1265 InitSeq.Perform(*this, MemberEntity, Kind, 1266 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1267 if (MemberInit.isInvalid()) 1268 return true; 1269 1270 // C++0x [class.base.init]p7: 1271 // The initialization of each base and member constitutes a 1272 // full-expression. 1273 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1274 if (MemberInit.isInvalid()) 1275 return true; 1276 1277 // If we are in a dependent context, template instantiation will 1278 // perform this type-checking again. Just save the arguments that we 1279 // received in a ParenListExpr. 1280 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1281 // of the information that we have about the member 1282 // initializer. However, deconstructing the ASTs is a dicey process, 1283 // and this approach is far more likely to get the corner cases right. 1284 if (CurContext->isDependentContext()) { 1285 // Bump the reference count of all of the arguments. 1286 for (unsigned I = 0; I != NumArgs; ++I) 1287 Args[I]->Retain(); 1288 1289 OwningExprResult Init 1290 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1291 RParenLoc)); 1292 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1293 LParenLoc, 1294 Init.takeAs<Expr>(), 1295 RParenLoc); 1296 } 1297 1298 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1299 LParenLoc, 1300 MemberInit.takeAs<Expr>(), 1301 RParenLoc); 1302} 1303 1304Sema::MemInitResult 1305Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1306 Expr **Args, unsigned NumArgs, 1307 SourceLocation LParenLoc, SourceLocation RParenLoc, 1308 CXXRecordDecl *ClassDecl) { 1309 bool HasDependentArg = false; 1310 for (unsigned i = 0; i < NumArgs; i++) 1311 HasDependentArg |= Args[i]->isTypeDependent(); 1312 1313 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getSourceRange().getBegin(); 1314 if (BaseType->isDependentType() || HasDependentArg) { 1315 // Can't check initialization for a base of dependent type or when 1316 // any of the arguments are type-dependent expressions. 1317 OwningExprResult BaseInit 1318 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1319 RParenLoc)); 1320 1321 // Erase any temporaries within this evaluation context; we're not 1322 // going to track them in the AST, since we'll be rebuilding the 1323 // ASTs during template instantiation. 1324 ExprTemporaries.erase( 1325 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1326 ExprTemporaries.end()); 1327 1328 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1329 LParenLoc, 1330 BaseInit.takeAs<Expr>(), 1331 RParenLoc); 1332 } 1333 1334 if (!BaseType->isRecordType()) 1335 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1336 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1337 1338 // C++ [class.base.init]p2: 1339 // [...] Unless the mem-initializer-id names a nonstatic data 1340 // member of the constructor’s class or a direct or virtual base 1341 // of that class, the mem-initializer is ill-formed. A 1342 // mem-initializer-list can initialize a base class using any 1343 // name that denotes that base class type. 1344 1345 // Check for direct and virtual base classes. 1346 const CXXBaseSpecifier *DirectBaseSpec = 0; 1347 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1348 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1349 VirtualBaseSpec); 1350 1351 // C++ [base.class.init]p2: 1352 // If a mem-initializer-id is ambiguous because it designates both 1353 // a direct non-virtual base class and an inherited virtual base 1354 // class, the mem-initializer is ill-formed. 1355 if (DirectBaseSpec && VirtualBaseSpec) 1356 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1357 << BaseType << BaseTInfo->getTypeLoc().getSourceRange(); 1358 // C++ [base.class.init]p2: 1359 // Unless the mem-initializer-id names a nonstatic data membeer of the 1360 // constructor's class ot a direst or virtual base of that class, the 1361 // mem-initializer is ill-formed. 1362 if (!DirectBaseSpec && !VirtualBaseSpec) 1363 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1364 << BaseType << ClassDecl->getNameAsCString() 1365 << BaseTInfo->getTypeLoc().getSourceRange(); 1366 1367 CXXBaseSpecifier *BaseSpec 1368 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1369 if (!BaseSpec) 1370 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1371 1372 // Initialize the base. 1373 InitializedEntity BaseEntity = 1374 InitializedEntity::InitializeBase(Context, BaseSpec); 1375 InitializationKind Kind = 1376 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1377 1378 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1379 1380 OwningExprResult BaseInit = 1381 InitSeq.Perform(*this, BaseEntity, Kind, 1382 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1383 if (BaseInit.isInvalid()) 1384 return true; 1385 1386 // C++0x [class.base.init]p7: 1387 // The initialization of each base and member constitutes a 1388 // full-expression. 1389 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1390 if (BaseInit.isInvalid()) 1391 return true; 1392 1393 // If we are in a dependent context, template instantiation will 1394 // perform this type-checking again. Just save the arguments that we 1395 // received in a ParenListExpr. 1396 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1397 // of the information that we have about the base 1398 // initializer. However, deconstructing the ASTs is a dicey process, 1399 // and this approach is far more likely to get the corner cases right. 1400 if (CurContext->isDependentContext()) { 1401 // Bump the reference count of all of the arguments. 1402 for (unsigned I = 0; I != NumArgs; ++I) 1403 Args[I]->Retain(); 1404 1405 OwningExprResult Init 1406 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1407 RParenLoc)); 1408 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1409 LParenLoc, 1410 Init.takeAs<Expr>(), 1411 RParenLoc); 1412 } 1413 1414 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1415 LParenLoc, 1416 BaseInit.takeAs<Expr>(), 1417 RParenLoc); 1418} 1419 1420bool 1421Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1422 CXXBaseOrMemberInitializer **Initializers, 1423 unsigned NumInitializers, 1424 bool IsImplicitConstructor, 1425 bool AnyErrors) { 1426 // We need to build the initializer AST according to order of construction 1427 // and not what user specified in the Initializers list. 1428 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1429 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1430 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1431 bool HasDependentBaseInit = false; 1432 bool HadError = false; 1433 1434 for (unsigned i = 0; i < NumInitializers; i++) { 1435 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1436 if (Member->isBaseInitializer()) { 1437 if (Member->getBaseClass()->isDependentType()) 1438 HasDependentBaseInit = true; 1439 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1440 } else { 1441 AllBaseFields[Member->getMember()] = Member; 1442 } 1443 } 1444 1445 if (HasDependentBaseInit) { 1446 // FIXME. This does not preserve the ordering of the initializers. 1447 // Try (with -Wreorder) 1448 // template<class X> struct A {}; 1449 // template<class X> struct B : A<X> { 1450 // B() : x1(10), A<X>() {} 1451 // int x1; 1452 // }; 1453 // B<int> x; 1454 // On seeing one dependent type, we should essentially exit this routine 1455 // while preserving user-declared initializer list. When this routine is 1456 // called during instantiatiation process, this routine will rebuild the 1457 // ordered initializer list correctly. 1458 1459 // If we have a dependent base initialization, we can't determine the 1460 // association between initializers and bases; just dump the known 1461 // initializers into the list, and don't try to deal with other bases. 1462 for (unsigned i = 0; i < NumInitializers; i++) { 1463 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1464 if (Member->isBaseInitializer()) 1465 AllToInit.push_back(Member); 1466 } 1467 } else { 1468 llvm::SmallVector<CXXBaseSpecifier *, 4> BasesToDefaultInit; 1469 1470 // Push virtual bases before others. 1471 for (CXXRecordDecl::base_class_iterator VBase = 1472 ClassDecl->vbases_begin(), 1473 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1474 if (VBase->getType()->isDependentType()) 1475 continue; 1476 if (CXXBaseOrMemberInitializer *Value 1477 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1478 AllToInit.push_back(Value); 1479 } else if (!AnyErrors) { 1480 InitializedEntity InitEntity 1481 = InitializedEntity::InitializeBase(Context, VBase); 1482 InitializationKind InitKind 1483 = InitializationKind::CreateDefault(Constructor->getLocation()); 1484 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1485 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1486 MultiExprArg(*this, 0, 0)); 1487 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1488 if (BaseInit.isInvalid()) { 1489 HadError = true; 1490 continue; 1491 } 1492 1493 // Don't attach synthesized base initializers in a dependent 1494 // context; they'll be checked again at template instantiation 1495 // time. 1496 if (CurContext->isDependentContext()) 1497 continue; 1498 1499 CXXBaseOrMemberInitializer *CXXBaseInit = 1500 new (Context) CXXBaseOrMemberInitializer(Context, 1501 Context.getTrivialTypeSourceInfo(VBase->getType(), 1502 SourceLocation()), 1503 SourceLocation(), 1504 BaseInit.takeAs<Expr>(), 1505 SourceLocation()); 1506 AllToInit.push_back(CXXBaseInit); 1507 } 1508 } 1509 1510 for (CXXRecordDecl::base_class_iterator Base = 1511 ClassDecl->bases_begin(), 1512 E = ClassDecl->bases_end(); Base != E; ++Base) { 1513 // Virtuals are in the virtual base list and already constructed. 1514 if (Base->isVirtual()) 1515 continue; 1516 // Skip dependent types. 1517 if (Base->getType()->isDependentType()) 1518 continue; 1519 if (CXXBaseOrMemberInitializer *Value 1520 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1521 AllToInit.push_back(Value); 1522 } 1523 else if (!AnyErrors) { 1524 InitializedEntity InitEntity 1525 = InitializedEntity::InitializeBase(Context, Base); 1526 InitializationKind InitKind 1527 = InitializationKind::CreateDefault(Constructor->getLocation()); 1528 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1529 OwningExprResult BaseInit = InitSeq.Perform(*this, InitEntity, InitKind, 1530 MultiExprArg(*this, 0, 0)); 1531 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1532 if (BaseInit.isInvalid()) { 1533 HadError = true; 1534 continue; 1535 } 1536 1537 // Don't attach synthesized base initializers in a dependent 1538 // context; they'll be regenerated at template instantiation 1539 // time. 1540 if (CurContext->isDependentContext()) 1541 continue; 1542 1543 CXXBaseOrMemberInitializer *CXXBaseInit = 1544 new (Context) CXXBaseOrMemberInitializer(Context, 1545 Context.getTrivialTypeSourceInfo(Base->getType(), 1546 SourceLocation()), 1547 SourceLocation(), 1548 BaseInit.takeAs<Expr>(), 1549 SourceLocation()); 1550 AllToInit.push_back(CXXBaseInit); 1551 } 1552 } 1553 } 1554 1555 // non-static data members. 1556 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1557 E = ClassDecl->field_end(); Field != E; ++Field) { 1558 if ((*Field)->isAnonymousStructOrUnion()) { 1559 if (const RecordType *FieldClassType = 1560 Field->getType()->getAs<RecordType>()) { 1561 CXXRecordDecl *FieldClassDecl 1562 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1563 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1564 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1565 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1566 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1567 // set to the anonymous union data member used in the initializer 1568 // list. 1569 Value->setMember(*Field); 1570 Value->setAnonUnionMember(*FA); 1571 AllToInit.push_back(Value); 1572 break; 1573 } 1574 } 1575 } 1576 continue; 1577 } 1578 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1579 AllToInit.push_back(Value); 1580 continue; 1581 } 1582 1583 if ((*Field)->getType()->isDependentType() || AnyErrors) 1584 continue; 1585 1586 QualType FT = Context.getBaseElementType((*Field)->getType()); 1587 if (FT->getAs<RecordType>()) { 1588 InitializedEntity InitEntity 1589 = InitializedEntity::InitializeMember(*Field); 1590 InitializationKind InitKind 1591 = InitializationKind::CreateDefault(Constructor->getLocation()); 1592 1593 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 1594 OwningExprResult MemberInit = InitSeq.Perform(*this, InitEntity, InitKind, 1595 MultiExprArg(*this, 0, 0)); 1596 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1597 if (MemberInit.isInvalid()) { 1598 HadError = true; 1599 continue; 1600 } 1601 1602 // Don't attach synthesized member initializers in a dependent 1603 // context; they'll be regenerated a template instantiation 1604 // time. 1605 if (CurContext->isDependentContext()) 1606 continue; 1607 1608 CXXBaseOrMemberInitializer *Member = 1609 new (Context) CXXBaseOrMemberInitializer(Context, 1610 *Field, SourceLocation(), 1611 SourceLocation(), 1612 MemberInit.takeAs<Expr>(), 1613 SourceLocation()); 1614 1615 AllToInit.push_back(Member); 1616 } 1617 else if (FT->isReferenceType()) { 1618 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1619 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1620 << 0 << (*Field)->getDeclName(); 1621 Diag((*Field)->getLocation(), diag::note_declared_at); 1622 HadError = true; 1623 } 1624 else if (FT.isConstQualified()) { 1625 Diag(Constructor->getLocation(), diag::err_uninitialized_member_in_ctor) 1626 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1627 << 1 << (*Field)->getDeclName(); 1628 Diag((*Field)->getLocation(), diag::note_declared_at); 1629 HadError = true; 1630 } 1631 } 1632 1633 NumInitializers = AllToInit.size(); 1634 if (NumInitializers > 0) { 1635 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1636 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1637 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1638 1639 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1640 for (unsigned Idx = 0; Idx < NumInitializers; ++Idx) 1641 baseOrMemberInitializers[Idx] = AllToInit[Idx]; 1642 } 1643 1644 return HadError; 1645} 1646 1647static void *GetKeyForTopLevelField(FieldDecl *Field) { 1648 // For anonymous unions, use the class declaration as the key. 1649 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1650 if (RT->getDecl()->isAnonymousStructOrUnion()) 1651 return static_cast<void *>(RT->getDecl()); 1652 } 1653 return static_cast<void *>(Field); 1654} 1655 1656static void *GetKeyForBase(QualType BaseType) { 1657 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1658 return (void *)RT; 1659 1660 assert(0 && "Unexpected base type!"); 1661 return 0; 1662} 1663 1664static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1665 bool MemberMaybeAnon = false) { 1666 // For fields injected into the class via declaration of an anonymous union, 1667 // use its anonymous union class declaration as the unique key. 1668 if (Member->isMemberInitializer()) { 1669 FieldDecl *Field = Member->getMember(); 1670 1671 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1672 // data member of the class. Data member used in the initializer list is 1673 // in AnonUnionMember field. 1674 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1675 Field = Member->getAnonUnionMember(); 1676 if (Field->getDeclContext()->isRecord()) { 1677 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 1678 if (RD->isAnonymousStructOrUnion()) 1679 return static_cast<void *>(RD); 1680 } 1681 return static_cast<void *>(Field); 1682 } 1683 1684 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1685} 1686 1687/// ActOnMemInitializers - Handle the member initializers for a constructor. 1688void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1689 SourceLocation ColonLoc, 1690 MemInitTy **MemInits, unsigned NumMemInits, 1691 bool AnyErrors) { 1692 if (!ConstructorDecl) 1693 return; 1694 1695 AdjustDeclIfTemplate(ConstructorDecl); 1696 1697 CXXConstructorDecl *Constructor 1698 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1699 1700 if (!Constructor) { 1701 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1702 return; 1703 } 1704 1705 if (!Constructor->isDependentContext()) { 1706 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 1707 bool err = false; 1708 for (unsigned i = 0; i < NumMemInits; i++) { 1709 CXXBaseOrMemberInitializer *Member = 1710 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1711 void *KeyToMember = GetKeyForMember(Member); 1712 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1713 if (!PrevMember) { 1714 PrevMember = Member; 1715 continue; 1716 } 1717 if (FieldDecl *Field = Member->getMember()) 1718 Diag(Member->getSourceLocation(), 1719 diag::error_multiple_mem_initialization) 1720 << Field->getNameAsString() 1721 << Member->getSourceRange(); 1722 else { 1723 Type *BaseClass = Member->getBaseClass(); 1724 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1725 Diag(Member->getSourceLocation(), 1726 diag::error_multiple_base_initialization) 1727 << QualType(BaseClass, 0) 1728 << Member->getSourceRange(); 1729 } 1730 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1731 << 0; 1732 err = true; 1733 } 1734 1735 if (err) 1736 return; 1737 } 1738 1739 SetBaseOrMemberInitializers(Constructor, 1740 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 1741 NumMemInits, false, AnyErrors); 1742 1743 if (Constructor->isDependentContext()) 1744 return; 1745 1746 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1747 Diagnostic::Ignored && 1748 Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1749 Diagnostic::Ignored) 1750 return; 1751 1752 // Also issue warning if order of ctor-initializer list does not match order 1753 // of 1) base class declarations and 2) order of non-static data members. 1754 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1755 1756 CXXRecordDecl *ClassDecl 1757 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1758 // Push virtual bases before others. 1759 for (CXXRecordDecl::base_class_iterator VBase = 1760 ClassDecl->vbases_begin(), 1761 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1762 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1763 1764 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1765 E = ClassDecl->bases_end(); Base != E; ++Base) { 1766 // Virtuals are alread in the virtual base list and are constructed 1767 // first. 1768 if (Base->isVirtual()) 1769 continue; 1770 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1771 } 1772 1773 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1774 E = ClassDecl->field_end(); Field != E; ++Field) 1775 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1776 1777 int Last = AllBaseOrMembers.size(); 1778 int curIndex = 0; 1779 CXXBaseOrMemberInitializer *PrevMember = 0; 1780 for (unsigned i = 0; i < NumMemInits; i++) { 1781 CXXBaseOrMemberInitializer *Member = 1782 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1783 void *MemberInCtorList = GetKeyForMember(Member, true); 1784 1785 for (; curIndex < Last; curIndex++) 1786 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1787 break; 1788 if (curIndex == Last) { 1789 assert(PrevMember && "Member not in member list?!"); 1790 // Initializer as specified in ctor-initializer list is out of order. 1791 // Issue a warning diagnostic. 1792 if (PrevMember->isBaseInitializer()) { 1793 // Diagnostics is for an initialized base class. 1794 Type *BaseClass = PrevMember->getBaseClass(); 1795 Diag(PrevMember->getSourceLocation(), 1796 diag::warn_base_initialized) 1797 << QualType(BaseClass, 0); 1798 } else { 1799 FieldDecl *Field = PrevMember->getMember(); 1800 Diag(PrevMember->getSourceLocation(), 1801 diag::warn_field_initialized) 1802 << Field->getNameAsString(); 1803 } 1804 // Also the note! 1805 if (FieldDecl *Field = Member->getMember()) 1806 Diag(Member->getSourceLocation(), 1807 diag::note_fieldorbase_initialized_here) << 0 1808 << Field->getNameAsString(); 1809 else { 1810 Type *BaseClass = Member->getBaseClass(); 1811 Diag(Member->getSourceLocation(), 1812 diag::note_fieldorbase_initialized_here) << 1 1813 << QualType(BaseClass, 0); 1814 } 1815 for (curIndex = 0; curIndex < Last; curIndex++) 1816 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1817 break; 1818 } 1819 PrevMember = Member; 1820 } 1821} 1822 1823void 1824Sema::MarkBaseAndMemberDestructorsReferenced(CXXDestructorDecl *Destructor) { 1825 // Ignore dependent destructors. 1826 if (Destructor->isDependentContext()) 1827 return; 1828 1829 CXXRecordDecl *ClassDecl = Destructor->getParent(); 1830 1831 // Non-static data members. 1832 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1833 E = ClassDecl->field_end(); I != E; ++I) { 1834 FieldDecl *Field = *I; 1835 1836 QualType FieldType = Context.getBaseElementType(Field->getType()); 1837 1838 const RecordType* RT = FieldType->getAs<RecordType>(); 1839 if (!RT) 1840 continue; 1841 1842 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1843 if (FieldClassDecl->hasTrivialDestructor()) 1844 continue; 1845 1846 const CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1847 MarkDeclarationReferenced(Destructor->getLocation(), 1848 const_cast<CXXDestructorDecl*>(Dtor)); 1849 } 1850 1851 // Bases. 1852 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1853 E = ClassDecl->bases_end(); Base != E; ++Base) { 1854 // Ignore virtual bases. 1855 if (Base->isVirtual()) 1856 continue; 1857 1858 // Ignore trivial destructors. 1859 CXXRecordDecl *BaseClassDecl 1860 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1861 if (BaseClassDecl->hasTrivialDestructor()) 1862 continue; 1863 1864 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1865 MarkDeclarationReferenced(Destructor->getLocation(), 1866 const_cast<CXXDestructorDecl*>(Dtor)); 1867 } 1868 1869 // Virtual bases. 1870 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1871 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1872 // Ignore trivial destructors. 1873 CXXRecordDecl *BaseClassDecl 1874 = cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1875 if (BaseClassDecl->hasTrivialDestructor()) 1876 continue; 1877 1878 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1879 MarkDeclarationReferenced(Destructor->getLocation(), 1880 const_cast<CXXDestructorDecl*>(Dtor)); 1881 } 1882} 1883 1884void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1885 if (!CDtorDecl) 1886 return; 1887 1888 AdjustDeclIfTemplate(CDtorDecl); 1889 1890 if (CXXConstructorDecl *Constructor 1891 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1892 SetBaseOrMemberInitializers(Constructor, 0, 0, false, false); 1893} 1894 1895namespace { 1896 /// PureVirtualMethodCollector - traverses a class and its superclasses 1897 /// and determines if it has any pure virtual methods. 1898 class PureVirtualMethodCollector { 1899 ASTContext &Context; 1900 1901 public: 1902 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1903 1904 private: 1905 MethodList Methods; 1906 1907 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1908 1909 public: 1910 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1911 : Context(Ctx) { 1912 1913 MethodList List; 1914 Collect(RD, List); 1915 1916 // Copy the temporary list to methods, and make sure to ignore any 1917 // null entries. 1918 for (size_t i = 0, e = List.size(); i != e; ++i) { 1919 if (List[i]) 1920 Methods.push_back(List[i]); 1921 } 1922 } 1923 1924 bool empty() const { return Methods.empty(); } 1925 1926 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1927 MethodList::const_iterator methods_end() { return Methods.end(); } 1928 }; 1929 1930 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1931 MethodList& Methods) { 1932 // First, collect the pure virtual methods for the base classes. 1933 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1934 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1935 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1936 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1937 if (BaseDecl && BaseDecl->isAbstract()) 1938 Collect(BaseDecl, Methods); 1939 } 1940 } 1941 1942 // Next, zero out any pure virtual methods that this class overrides. 1943 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1944 1945 MethodSetTy OverriddenMethods; 1946 size_t MethodsSize = Methods.size(); 1947 1948 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1949 i != e; ++i) { 1950 // Traverse the record, looking for methods. 1951 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1952 // If the method is pure virtual, add it to the methods vector. 1953 if (MD->isPure()) 1954 Methods.push_back(MD); 1955 1956 // Record all the overridden methods in our set. 1957 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1958 E = MD->end_overridden_methods(); I != E; ++I) { 1959 // Keep track of the overridden methods. 1960 OverriddenMethods.insert(*I); 1961 } 1962 } 1963 } 1964 1965 // Now go through the methods and zero out all the ones we know are 1966 // overridden. 1967 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1968 if (OverriddenMethods.count(Methods[i])) 1969 Methods[i] = 0; 1970 } 1971 1972 } 1973} 1974 1975 1976bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1977 unsigned DiagID, AbstractDiagSelID SelID, 1978 const CXXRecordDecl *CurrentRD) { 1979 if (SelID == -1) 1980 return RequireNonAbstractType(Loc, T, 1981 PDiag(DiagID), CurrentRD); 1982 else 1983 return RequireNonAbstractType(Loc, T, 1984 PDiag(DiagID) << SelID, CurrentRD); 1985} 1986 1987bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1988 const PartialDiagnostic &PD, 1989 const CXXRecordDecl *CurrentRD) { 1990 if (!getLangOptions().CPlusPlus) 1991 return false; 1992 1993 if (const ArrayType *AT = Context.getAsArrayType(T)) 1994 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 1995 CurrentRD); 1996 1997 if (const PointerType *PT = T->getAs<PointerType>()) { 1998 // Find the innermost pointer type. 1999 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2000 PT = T; 2001 2002 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2003 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2004 } 2005 2006 const RecordType *RT = T->getAs<RecordType>(); 2007 if (!RT) 2008 return false; 2009 2010 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2011 2012 if (CurrentRD && CurrentRD != RD) 2013 return false; 2014 2015 // FIXME: is this reasonable? It matches current behavior, but.... 2016 if (!RD->getDefinition()) 2017 return false; 2018 2019 if (!RD->isAbstract()) 2020 return false; 2021 2022 Diag(Loc, PD) << RD->getDeclName(); 2023 2024 // Check if we've already emitted the list of pure virtual functions for this 2025 // class. 2026 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2027 return true; 2028 2029 PureVirtualMethodCollector Collector(Context, RD); 2030 2031 for (PureVirtualMethodCollector::MethodList::const_iterator I = 2032 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 2033 const CXXMethodDecl *MD = *I; 2034 2035 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 2036 MD->getDeclName(); 2037 } 2038 2039 if (!PureVirtualClassDiagSet) 2040 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2041 PureVirtualClassDiagSet->insert(RD); 2042 2043 return true; 2044} 2045 2046namespace { 2047 class AbstractClassUsageDiagnoser 2048 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2049 Sema &SemaRef; 2050 CXXRecordDecl *AbstractClass; 2051 2052 bool VisitDeclContext(const DeclContext *DC) { 2053 bool Invalid = false; 2054 2055 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2056 E = DC->decls_end(); I != E; ++I) 2057 Invalid |= Visit(*I); 2058 2059 return Invalid; 2060 } 2061 2062 public: 2063 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2064 : SemaRef(SemaRef), AbstractClass(ac) { 2065 Visit(SemaRef.Context.getTranslationUnitDecl()); 2066 } 2067 2068 bool VisitFunctionDecl(const FunctionDecl *FD) { 2069 if (FD->isThisDeclarationADefinition()) { 2070 // No need to do the check if we're in a definition, because it requires 2071 // that the return/param types are complete. 2072 // because that requires 2073 return VisitDeclContext(FD); 2074 } 2075 2076 // Check the return type. 2077 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2078 bool Invalid = 2079 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2080 diag::err_abstract_type_in_decl, 2081 Sema::AbstractReturnType, 2082 AbstractClass); 2083 2084 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2085 E = FD->param_end(); I != E; ++I) { 2086 const ParmVarDecl *VD = *I; 2087 Invalid |= 2088 SemaRef.RequireNonAbstractType(VD->getLocation(), 2089 VD->getOriginalType(), 2090 diag::err_abstract_type_in_decl, 2091 Sema::AbstractParamType, 2092 AbstractClass); 2093 } 2094 2095 return Invalid; 2096 } 2097 2098 bool VisitDecl(const Decl* D) { 2099 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2100 return VisitDeclContext(DC); 2101 2102 return false; 2103 } 2104 }; 2105} 2106 2107/// \brief Perform semantic checks on a class definition that has been 2108/// completing, introducing implicitly-declared members, checking for 2109/// abstract types, etc. 2110void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2111 if (!Record || Record->isInvalidDecl()) 2112 return; 2113 2114 if (!Record->isDependentType()) 2115 AddImplicitlyDeclaredMembersToClass(Record); 2116 2117 if (Record->isInvalidDecl()) 2118 return; 2119 2120 // Set access bits correctly on the directly-declared conversions. 2121 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2122 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2123 Convs->setAccess(I, (*I)->getAccess()); 2124 2125 if (!Record->isAbstract()) { 2126 // Collect all the pure virtual methods and see if this is an abstract 2127 // class after all. 2128 PureVirtualMethodCollector Collector(Context, Record); 2129 if (!Collector.empty()) 2130 Record->setAbstract(true); 2131 } 2132 2133 if (Record->isAbstract()) 2134 (void)AbstractClassUsageDiagnoser(*this, Record); 2135} 2136 2137void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2138 DeclPtrTy TagDecl, 2139 SourceLocation LBrac, 2140 SourceLocation RBrac) { 2141 if (!TagDecl) 2142 return; 2143 2144 AdjustDeclIfTemplate(TagDecl); 2145 2146 ActOnFields(S, RLoc, TagDecl, 2147 (DeclPtrTy*)FieldCollector->getCurFields(), 2148 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 2149 2150 CheckCompletedCXXClass( 2151 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2152} 2153 2154/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2155/// special functions, such as the default constructor, copy 2156/// constructor, or destructor, to the given C++ class (C++ 2157/// [special]p1). This routine can only be executed just before the 2158/// definition of the class is complete. 2159void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2160 CanQualType ClassType 2161 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2162 2163 // FIXME: Implicit declarations have exception specifications, which are 2164 // the union of the specifications of the implicitly called functions. 2165 2166 if (!ClassDecl->hasUserDeclaredConstructor()) { 2167 // C++ [class.ctor]p5: 2168 // A default constructor for a class X is a constructor of class X 2169 // that can be called without an argument. If there is no 2170 // user-declared constructor for class X, a default constructor is 2171 // implicitly declared. An implicitly-declared default constructor 2172 // is an inline public member of its class. 2173 DeclarationName Name 2174 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2175 CXXConstructorDecl *DefaultCon = 2176 CXXConstructorDecl::Create(Context, ClassDecl, 2177 ClassDecl->getLocation(), Name, 2178 Context.getFunctionType(Context.VoidTy, 2179 0, 0, false, 0), 2180 /*TInfo=*/0, 2181 /*isExplicit=*/false, 2182 /*isInline=*/true, 2183 /*isImplicitlyDeclared=*/true); 2184 DefaultCon->setAccess(AS_public); 2185 DefaultCon->setImplicit(); 2186 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2187 ClassDecl->addDecl(DefaultCon); 2188 } 2189 2190 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2191 // C++ [class.copy]p4: 2192 // If the class definition does not explicitly declare a copy 2193 // constructor, one is declared implicitly. 2194 2195 // C++ [class.copy]p5: 2196 // The implicitly-declared copy constructor for a class X will 2197 // have the form 2198 // 2199 // X::X(const X&) 2200 // 2201 // if 2202 bool HasConstCopyConstructor = true; 2203 2204 // -- each direct or virtual base class B of X has a copy 2205 // constructor whose first parameter is of type const B& or 2206 // const volatile B&, and 2207 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2208 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2209 const CXXRecordDecl *BaseClassDecl 2210 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2211 HasConstCopyConstructor 2212 = BaseClassDecl->hasConstCopyConstructor(Context); 2213 } 2214 2215 // -- for all the nonstatic data members of X that are of a 2216 // class type M (or array thereof), each such class type 2217 // has a copy constructor whose first parameter is of type 2218 // const M& or const volatile M&. 2219 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2220 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2221 ++Field) { 2222 QualType FieldType = (*Field)->getType(); 2223 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2224 FieldType = Array->getElementType(); 2225 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2226 const CXXRecordDecl *FieldClassDecl 2227 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2228 HasConstCopyConstructor 2229 = FieldClassDecl->hasConstCopyConstructor(Context); 2230 } 2231 } 2232 2233 // Otherwise, the implicitly declared copy constructor will have 2234 // the form 2235 // 2236 // X::X(X&) 2237 QualType ArgType = ClassType; 2238 if (HasConstCopyConstructor) 2239 ArgType = ArgType.withConst(); 2240 ArgType = Context.getLValueReferenceType(ArgType); 2241 2242 // An implicitly-declared copy constructor is an inline public 2243 // member of its class. 2244 DeclarationName Name 2245 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2246 CXXConstructorDecl *CopyConstructor 2247 = CXXConstructorDecl::Create(Context, ClassDecl, 2248 ClassDecl->getLocation(), Name, 2249 Context.getFunctionType(Context.VoidTy, 2250 &ArgType, 1, 2251 false, 0), 2252 /*TInfo=*/0, 2253 /*isExplicit=*/false, 2254 /*isInline=*/true, 2255 /*isImplicitlyDeclared=*/true); 2256 CopyConstructor->setAccess(AS_public); 2257 CopyConstructor->setImplicit(); 2258 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2259 2260 // Add the parameter to the constructor. 2261 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2262 ClassDecl->getLocation(), 2263 /*IdentifierInfo=*/0, 2264 ArgType, /*TInfo=*/0, 2265 VarDecl::None, 0); 2266 CopyConstructor->setParams(&FromParam, 1); 2267 ClassDecl->addDecl(CopyConstructor); 2268 } 2269 2270 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2271 // Note: The following rules are largely analoguous to the copy 2272 // constructor rules. Note that virtual bases are not taken into account 2273 // for determining the argument type of the operator. Note also that 2274 // operators taking an object instead of a reference are allowed. 2275 // 2276 // C++ [class.copy]p10: 2277 // If the class definition does not explicitly declare a copy 2278 // assignment operator, one is declared implicitly. 2279 // The implicitly-defined copy assignment operator for a class X 2280 // will have the form 2281 // 2282 // X& X::operator=(const X&) 2283 // 2284 // if 2285 bool HasConstCopyAssignment = true; 2286 2287 // -- each direct base class B of X has a copy assignment operator 2288 // whose parameter is of type const B&, const volatile B& or B, 2289 // and 2290 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2291 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2292 assert(!Base->getType()->isDependentType() && 2293 "Cannot generate implicit members for class with dependent bases."); 2294 const CXXRecordDecl *BaseClassDecl 2295 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2296 const CXXMethodDecl *MD = 0; 2297 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2298 MD); 2299 } 2300 2301 // -- for all the nonstatic data members of X that are of a class 2302 // type M (or array thereof), each such class type has a copy 2303 // assignment operator whose parameter is of type const M&, 2304 // const volatile M& or M. 2305 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2306 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2307 ++Field) { 2308 QualType FieldType = (*Field)->getType(); 2309 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2310 FieldType = Array->getElementType(); 2311 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2312 const CXXRecordDecl *FieldClassDecl 2313 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2314 const CXXMethodDecl *MD = 0; 2315 HasConstCopyAssignment 2316 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2317 } 2318 } 2319 2320 // Otherwise, the implicitly declared copy assignment operator will 2321 // have the form 2322 // 2323 // X& X::operator=(X&) 2324 QualType ArgType = ClassType; 2325 QualType RetType = Context.getLValueReferenceType(ArgType); 2326 if (HasConstCopyAssignment) 2327 ArgType = ArgType.withConst(); 2328 ArgType = Context.getLValueReferenceType(ArgType); 2329 2330 // An implicitly-declared copy assignment operator is an inline public 2331 // member of its class. 2332 DeclarationName Name = 2333 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2334 CXXMethodDecl *CopyAssignment = 2335 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2336 Context.getFunctionType(RetType, &ArgType, 1, 2337 false, 0), 2338 /*TInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2339 CopyAssignment->setAccess(AS_public); 2340 CopyAssignment->setImplicit(); 2341 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2342 CopyAssignment->setCopyAssignment(true); 2343 2344 // Add the parameter to the operator. 2345 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2346 ClassDecl->getLocation(), 2347 /*IdentifierInfo=*/0, 2348 ArgType, /*TInfo=*/0, 2349 VarDecl::None, 0); 2350 CopyAssignment->setParams(&FromParam, 1); 2351 2352 // Don't call addedAssignmentOperator. There is no way to distinguish an 2353 // implicit from an explicit assignment operator. 2354 ClassDecl->addDecl(CopyAssignment); 2355 AddOverriddenMethods(ClassDecl, CopyAssignment); 2356 } 2357 2358 if (!ClassDecl->hasUserDeclaredDestructor()) { 2359 // C++ [class.dtor]p2: 2360 // If a class has no user-declared destructor, a destructor is 2361 // declared implicitly. An implicitly-declared destructor is an 2362 // inline public member of its class. 2363 DeclarationName Name 2364 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2365 CXXDestructorDecl *Destructor 2366 = CXXDestructorDecl::Create(Context, ClassDecl, 2367 ClassDecl->getLocation(), Name, 2368 Context.getFunctionType(Context.VoidTy, 2369 0, 0, false, 0), 2370 /*isInline=*/true, 2371 /*isImplicitlyDeclared=*/true); 2372 Destructor->setAccess(AS_public); 2373 Destructor->setImplicit(); 2374 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2375 ClassDecl->addDecl(Destructor); 2376 2377 AddOverriddenMethods(ClassDecl, Destructor); 2378 } 2379} 2380 2381void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2382 Decl *D = TemplateD.getAs<Decl>(); 2383 if (!D) 2384 return; 2385 2386 TemplateParameterList *Params = 0; 2387 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2388 Params = Template->getTemplateParameters(); 2389 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2390 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2391 Params = PartialSpec->getTemplateParameters(); 2392 else 2393 return; 2394 2395 for (TemplateParameterList::iterator Param = Params->begin(), 2396 ParamEnd = Params->end(); 2397 Param != ParamEnd; ++Param) { 2398 NamedDecl *Named = cast<NamedDecl>(*Param); 2399 if (Named->getDeclName()) { 2400 S->AddDecl(DeclPtrTy::make(Named)); 2401 IdResolver.AddDecl(Named); 2402 } 2403 } 2404} 2405 2406void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2407 if (!RecordD) return; 2408 AdjustDeclIfTemplate(RecordD); 2409 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2410 PushDeclContext(S, Record); 2411} 2412 2413void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2414 if (!RecordD) return; 2415 PopDeclContext(); 2416} 2417 2418/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2419/// parsing a top-level (non-nested) C++ class, and we are now 2420/// parsing those parts of the given Method declaration that could 2421/// not be parsed earlier (C++ [class.mem]p2), such as default 2422/// arguments. This action should enter the scope of the given 2423/// Method declaration as if we had just parsed the qualified method 2424/// name. However, it should not bring the parameters into scope; 2425/// that will be performed by ActOnDelayedCXXMethodParameter. 2426void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2427} 2428 2429/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2430/// C++ method declaration. We're (re-)introducing the given 2431/// function parameter into scope for use in parsing later parts of 2432/// the method declaration. For example, we could see an 2433/// ActOnParamDefaultArgument event for this parameter. 2434void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2435 if (!ParamD) 2436 return; 2437 2438 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2439 2440 // If this parameter has an unparsed default argument, clear it out 2441 // to make way for the parsed default argument. 2442 if (Param->hasUnparsedDefaultArg()) 2443 Param->setDefaultArg(0); 2444 2445 S->AddDecl(DeclPtrTy::make(Param)); 2446 if (Param->getDeclName()) 2447 IdResolver.AddDecl(Param); 2448} 2449 2450/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2451/// processing the delayed method declaration for Method. The method 2452/// declaration is now considered finished. There may be a separate 2453/// ActOnStartOfFunctionDef action later (not necessarily 2454/// immediately!) for this method, if it was also defined inside the 2455/// class body. 2456void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2457 if (!MethodD) 2458 return; 2459 2460 AdjustDeclIfTemplate(MethodD); 2461 2462 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2463 2464 // Now that we have our default arguments, check the constructor 2465 // again. It could produce additional diagnostics or affect whether 2466 // the class has implicitly-declared destructors, among other 2467 // things. 2468 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2469 CheckConstructor(Constructor); 2470 2471 // Check the default arguments, which we may have added. 2472 if (!Method->isInvalidDecl()) 2473 CheckCXXDefaultArguments(Method); 2474} 2475 2476/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2477/// the well-formedness of the constructor declarator @p D with type @p 2478/// R. If there are any errors in the declarator, this routine will 2479/// emit diagnostics and set the invalid bit to true. In any case, the type 2480/// will be updated to reflect a well-formed type for the constructor and 2481/// returned. 2482QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2483 FunctionDecl::StorageClass &SC) { 2484 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2485 2486 // C++ [class.ctor]p3: 2487 // A constructor shall not be virtual (10.3) or static (9.4). A 2488 // constructor can be invoked for a const, volatile or const 2489 // volatile object. A constructor shall not be declared const, 2490 // volatile, or const volatile (9.3.2). 2491 if (isVirtual) { 2492 if (!D.isInvalidType()) 2493 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2494 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2495 << SourceRange(D.getIdentifierLoc()); 2496 D.setInvalidType(); 2497 } 2498 if (SC == FunctionDecl::Static) { 2499 if (!D.isInvalidType()) 2500 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2501 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2502 << SourceRange(D.getIdentifierLoc()); 2503 D.setInvalidType(); 2504 SC = FunctionDecl::None; 2505 } 2506 2507 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2508 if (FTI.TypeQuals != 0) { 2509 if (FTI.TypeQuals & Qualifiers::Const) 2510 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2511 << "const" << SourceRange(D.getIdentifierLoc()); 2512 if (FTI.TypeQuals & Qualifiers::Volatile) 2513 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2514 << "volatile" << SourceRange(D.getIdentifierLoc()); 2515 if (FTI.TypeQuals & Qualifiers::Restrict) 2516 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2517 << "restrict" << SourceRange(D.getIdentifierLoc()); 2518 } 2519 2520 // Rebuild the function type "R" without any type qualifiers (in 2521 // case any of the errors above fired) and with "void" as the 2522 // return type, since constructors don't have return types. We 2523 // *always* have to do this, because GetTypeForDeclarator will 2524 // put in a result type of "int" when none was specified. 2525 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2526 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2527 Proto->getNumArgs(), 2528 Proto->isVariadic(), 0); 2529} 2530 2531/// CheckConstructor - Checks a fully-formed constructor for 2532/// well-formedness, issuing any diagnostics required. Returns true if 2533/// the constructor declarator is invalid. 2534void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2535 CXXRecordDecl *ClassDecl 2536 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2537 if (!ClassDecl) 2538 return Constructor->setInvalidDecl(); 2539 2540 // C++ [class.copy]p3: 2541 // A declaration of a constructor for a class X is ill-formed if 2542 // its first parameter is of type (optionally cv-qualified) X and 2543 // either there are no other parameters or else all other 2544 // parameters have default arguments. 2545 if (!Constructor->isInvalidDecl() && 2546 ((Constructor->getNumParams() == 1) || 2547 (Constructor->getNumParams() > 1 && 2548 Constructor->getParamDecl(1)->hasDefaultArg())) && 2549 Constructor->getTemplateSpecializationKind() 2550 != TSK_ImplicitInstantiation) { 2551 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2552 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2553 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2554 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2555 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2556 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 2557 2558 // FIXME: Rather that making the constructor invalid, we should endeavor 2559 // to fix the type. 2560 Constructor->setInvalidDecl(); 2561 } 2562 } 2563 2564 // Notify the class that we've added a constructor. 2565 ClassDecl->addedConstructor(Context, Constructor); 2566} 2567 2568/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2569/// issuing any diagnostics required. Returns true on error. 2570bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2571 CXXRecordDecl *RD = Destructor->getParent(); 2572 2573 if (Destructor->isVirtual()) { 2574 SourceLocation Loc; 2575 2576 if (!Destructor->isImplicit()) 2577 Loc = Destructor->getLocation(); 2578 else 2579 Loc = RD->getLocation(); 2580 2581 // If we have a virtual destructor, look up the deallocation function 2582 FunctionDecl *OperatorDelete = 0; 2583 DeclarationName Name = 2584 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2585 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2586 return true; 2587 2588 Destructor->setOperatorDelete(OperatorDelete); 2589 } 2590 2591 return false; 2592} 2593 2594static inline bool 2595FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2596 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2597 FTI.ArgInfo[0].Param && 2598 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2599} 2600 2601/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2602/// the well-formednes of the destructor declarator @p D with type @p 2603/// R. If there are any errors in the declarator, this routine will 2604/// emit diagnostics and set the declarator to invalid. Even if this happens, 2605/// will be updated to reflect a well-formed type for the destructor and 2606/// returned. 2607QualType Sema::CheckDestructorDeclarator(Declarator &D, 2608 FunctionDecl::StorageClass& SC) { 2609 // C++ [class.dtor]p1: 2610 // [...] A typedef-name that names a class is a class-name 2611 // (7.1.3); however, a typedef-name that names a class shall not 2612 // be used as the identifier in the declarator for a destructor 2613 // declaration. 2614 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2615 if (isa<TypedefType>(DeclaratorType)) { 2616 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2617 << DeclaratorType; 2618 D.setInvalidType(); 2619 } 2620 2621 // C++ [class.dtor]p2: 2622 // A destructor is used to destroy objects of its class type. A 2623 // destructor takes no parameters, and no return type can be 2624 // specified for it (not even void). The address of a destructor 2625 // shall not be taken. A destructor shall not be static. A 2626 // destructor can be invoked for a const, volatile or const 2627 // volatile object. A destructor shall not be declared const, 2628 // volatile or const volatile (9.3.2). 2629 if (SC == FunctionDecl::Static) { 2630 if (!D.isInvalidType()) 2631 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2632 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2633 << SourceRange(D.getIdentifierLoc()); 2634 SC = FunctionDecl::None; 2635 D.setInvalidType(); 2636 } 2637 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2638 // Destructors don't have return types, but the parser will 2639 // happily parse something like: 2640 // 2641 // class X { 2642 // float ~X(); 2643 // }; 2644 // 2645 // The return type will be eliminated later. 2646 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2647 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2648 << SourceRange(D.getIdentifierLoc()); 2649 } 2650 2651 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2652 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2653 if (FTI.TypeQuals & Qualifiers::Const) 2654 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2655 << "const" << SourceRange(D.getIdentifierLoc()); 2656 if (FTI.TypeQuals & Qualifiers::Volatile) 2657 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2658 << "volatile" << SourceRange(D.getIdentifierLoc()); 2659 if (FTI.TypeQuals & Qualifiers::Restrict) 2660 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2661 << "restrict" << SourceRange(D.getIdentifierLoc()); 2662 D.setInvalidType(); 2663 } 2664 2665 // Make sure we don't have any parameters. 2666 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2667 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2668 2669 // Delete the parameters. 2670 FTI.freeArgs(); 2671 D.setInvalidType(); 2672 } 2673 2674 // Make sure the destructor isn't variadic. 2675 if (FTI.isVariadic) { 2676 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2677 D.setInvalidType(); 2678 } 2679 2680 // Rebuild the function type "R" without any type qualifiers or 2681 // parameters (in case any of the errors above fired) and with 2682 // "void" as the return type, since destructors don't have return 2683 // types. We *always* have to do this, because GetTypeForDeclarator 2684 // will put in a result type of "int" when none was specified. 2685 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 2686} 2687 2688/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2689/// well-formednes of the conversion function declarator @p D with 2690/// type @p R. If there are any errors in the declarator, this routine 2691/// will emit diagnostics and return true. Otherwise, it will return 2692/// false. Either way, the type @p R will be updated to reflect a 2693/// well-formed type for the conversion operator. 2694void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2695 FunctionDecl::StorageClass& SC) { 2696 // C++ [class.conv.fct]p1: 2697 // Neither parameter types nor return type can be specified. The 2698 // type of a conversion function (8.3.5) is "function taking no 2699 // parameter returning conversion-type-id." 2700 if (SC == FunctionDecl::Static) { 2701 if (!D.isInvalidType()) 2702 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2703 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2704 << SourceRange(D.getIdentifierLoc()); 2705 D.setInvalidType(); 2706 SC = FunctionDecl::None; 2707 } 2708 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2709 // Conversion functions don't have return types, but the parser will 2710 // happily parse something like: 2711 // 2712 // class X { 2713 // float operator bool(); 2714 // }; 2715 // 2716 // The return type will be changed later anyway. 2717 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2718 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2719 << SourceRange(D.getIdentifierLoc()); 2720 } 2721 2722 // Make sure we don't have any parameters. 2723 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2724 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2725 2726 // Delete the parameters. 2727 D.getTypeObject(0).Fun.freeArgs(); 2728 D.setInvalidType(); 2729 } 2730 2731 // Make sure the conversion function isn't variadic. 2732 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2733 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2734 D.setInvalidType(); 2735 } 2736 2737 // C++ [class.conv.fct]p4: 2738 // The conversion-type-id shall not represent a function type nor 2739 // an array type. 2740 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2741 if (ConvType->isArrayType()) { 2742 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2743 ConvType = Context.getPointerType(ConvType); 2744 D.setInvalidType(); 2745 } else if (ConvType->isFunctionType()) { 2746 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2747 ConvType = Context.getPointerType(ConvType); 2748 D.setInvalidType(); 2749 } 2750 2751 // Rebuild the function type "R" without any parameters (in case any 2752 // of the errors above fired) and with the conversion type as the 2753 // return type. 2754 R = Context.getFunctionType(ConvType, 0, 0, false, 2755 R->getAs<FunctionProtoType>()->getTypeQuals()); 2756 2757 // C++0x explicit conversion operators. 2758 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2759 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2760 diag::warn_explicit_conversion_functions) 2761 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2762} 2763 2764/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2765/// the declaration of the given C++ conversion function. This routine 2766/// is responsible for recording the conversion function in the C++ 2767/// class, if possible. 2768Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2769 assert(Conversion && "Expected to receive a conversion function declaration"); 2770 2771 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2772 2773 // Make sure we aren't redeclaring the conversion function. 2774 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2775 2776 // C++ [class.conv.fct]p1: 2777 // [...] A conversion function is never used to convert a 2778 // (possibly cv-qualified) object to the (possibly cv-qualified) 2779 // same object type (or a reference to it), to a (possibly 2780 // cv-qualified) base class of that type (or a reference to it), 2781 // or to (possibly cv-qualified) void. 2782 // FIXME: Suppress this warning if the conversion function ends up being a 2783 // virtual function that overrides a virtual function in a base class. 2784 QualType ClassType 2785 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2786 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2787 ConvType = ConvTypeRef->getPointeeType(); 2788 if (ConvType->isRecordType()) { 2789 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2790 if (ConvType == ClassType) 2791 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2792 << ClassType; 2793 else if (IsDerivedFrom(ClassType, ConvType)) 2794 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2795 << ClassType << ConvType; 2796 } else if (ConvType->isVoidType()) { 2797 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2798 << ClassType << ConvType; 2799 } 2800 2801 if (Conversion->getPrimaryTemplate()) { 2802 // ignore specializations 2803 } else if (Conversion->getPreviousDeclaration()) { 2804 if (FunctionTemplateDecl *ConversionTemplate 2805 = Conversion->getDescribedFunctionTemplate()) { 2806 if (ClassDecl->replaceConversion( 2807 ConversionTemplate->getPreviousDeclaration(), 2808 ConversionTemplate)) 2809 return DeclPtrTy::make(ConversionTemplate); 2810 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 2811 Conversion)) 2812 return DeclPtrTy::make(Conversion); 2813 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2814 } else if (FunctionTemplateDecl *ConversionTemplate 2815 = Conversion->getDescribedFunctionTemplate()) 2816 ClassDecl->addConversionFunction(ConversionTemplate); 2817 else 2818 ClassDecl->addConversionFunction(Conversion); 2819 2820 return DeclPtrTy::make(Conversion); 2821} 2822 2823//===----------------------------------------------------------------------===// 2824// Namespace Handling 2825//===----------------------------------------------------------------------===// 2826 2827/// ActOnStartNamespaceDef - This is called at the start of a namespace 2828/// definition. 2829Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2830 SourceLocation IdentLoc, 2831 IdentifierInfo *II, 2832 SourceLocation LBrace, 2833 AttributeList *AttrList) { 2834 NamespaceDecl *Namespc = 2835 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2836 Namespc->setLBracLoc(LBrace); 2837 2838 Scope *DeclRegionScope = NamespcScope->getParent(); 2839 2840 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 2841 2842 if (II) { 2843 // C++ [namespace.def]p2: 2844 // The identifier in an original-namespace-definition shall not have been 2845 // previously defined in the declarative region in which the 2846 // original-namespace-definition appears. The identifier in an 2847 // original-namespace-definition is the name of the namespace. Subsequently 2848 // in that declarative region, it is treated as an original-namespace-name. 2849 2850 NamedDecl *PrevDecl 2851 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2852 ForRedeclaration); 2853 2854 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2855 // This is an extended namespace definition. 2856 // Attach this namespace decl to the chain of extended namespace 2857 // definitions. 2858 OrigNS->setNextNamespace(Namespc); 2859 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2860 2861 // Remove the previous declaration from the scope. 2862 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2863 IdResolver.RemoveDecl(OrigNS); 2864 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2865 } 2866 } else if (PrevDecl) { 2867 // This is an invalid name redefinition. 2868 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2869 << Namespc->getDeclName(); 2870 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2871 Namespc->setInvalidDecl(); 2872 // Continue on to push Namespc as current DeclContext and return it. 2873 } else if (II->isStr("std") && 2874 CurContext->getLookupContext()->isTranslationUnit()) { 2875 // This is the first "real" definition of the namespace "std", so update 2876 // our cache of the "std" namespace to point at this definition. 2877 if (StdNamespace) { 2878 // We had already defined a dummy namespace "std". Link this new 2879 // namespace definition to the dummy namespace "std". 2880 StdNamespace->setNextNamespace(Namespc); 2881 StdNamespace->setLocation(IdentLoc); 2882 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2883 } 2884 2885 // Make our StdNamespace cache point at the first real definition of the 2886 // "std" namespace. 2887 StdNamespace = Namespc; 2888 } 2889 2890 PushOnScopeChains(Namespc, DeclRegionScope); 2891 } else { 2892 // Anonymous namespaces. 2893 assert(Namespc->isAnonymousNamespace()); 2894 CurContext->addDecl(Namespc); 2895 2896 // Link the anonymous namespace into its parent. 2897 NamespaceDecl *PrevDecl; 2898 DeclContext *Parent = CurContext->getLookupContext(); 2899 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 2900 PrevDecl = TU->getAnonymousNamespace(); 2901 TU->setAnonymousNamespace(Namespc); 2902 } else { 2903 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 2904 PrevDecl = ND->getAnonymousNamespace(); 2905 ND->setAnonymousNamespace(Namespc); 2906 } 2907 2908 // Link the anonymous namespace with its previous declaration. 2909 if (PrevDecl) { 2910 assert(PrevDecl->isAnonymousNamespace()); 2911 assert(!PrevDecl->getNextNamespace()); 2912 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 2913 PrevDecl->setNextNamespace(Namespc); 2914 } 2915 2916 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2917 // behaves as if it were replaced by 2918 // namespace unique { /* empty body */ } 2919 // using namespace unique; 2920 // namespace unique { namespace-body } 2921 // where all occurrences of 'unique' in a translation unit are 2922 // replaced by the same identifier and this identifier differs 2923 // from all other identifiers in the entire program. 2924 2925 // We just create the namespace with an empty name and then add an 2926 // implicit using declaration, just like the standard suggests. 2927 // 2928 // CodeGen enforces the "universally unique" aspect by giving all 2929 // declarations semantically contained within an anonymous 2930 // namespace internal linkage. 2931 2932 if (!PrevDecl) { 2933 UsingDirectiveDecl* UD 2934 = UsingDirectiveDecl::Create(Context, CurContext, 2935 /* 'using' */ LBrace, 2936 /* 'namespace' */ SourceLocation(), 2937 /* qualifier */ SourceRange(), 2938 /* NNS */ NULL, 2939 /* identifier */ SourceLocation(), 2940 Namespc, 2941 /* Ancestor */ CurContext); 2942 UD->setImplicit(); 2943 CurContext->addDecl(UD); 2944 } 2945 } 2946 2947 // Although we could have an invalid decl (i.e. the namespace name is a 2948 // redefinition), push it as current DeclContext and try to continue parsing. 2949 // FIXME: We should be able to push Namespc here, so that the each DeclContext 2950 // for the namespace has the declarations that showed up in that particular 2951 // namespace definition. 2952 PushDeclContext(NamespcScope, Namespc); 2953 return DeclPtrTy::make(Namespc); 2954} 2955 2956/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2957/// is a namespace alias, returns the namespace it points to. 2958static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2959 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2960 return AD->getNamespace(); 2961 return dyn_cast_or_null<NamespaceDecl>(D); 2962} 2963 2964/// ActOnFinishNamespaceDef - This callback is called after a namespace is 2965/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 2966void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 2967 Decl *Dcl = D.getAs<Decl>(); 2968 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 2969 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 2970 Namespc->setRBracLoc(RBrace); 2971 PopDeclContext(); 2972} 2973 2974Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 2975 SourceLocation UsingLoc, 2976 SourceLocation NamespcLoc, 2977 const CXXScopeSpec &SS, 2978 SourceLocation IdentLoc, 2979 IdentifierInfo *NamespcName, 2980 AttributeList *AttrList) { 2981 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2982 assert(NamespcName && "Invalid NamespcName."); 2983 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 2984 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2985 2986 UsingDirectiveDecl *UDir = 0; 2987 2988 // Lookup namespace name. 2989 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 2990 LookupParsedName(R, S, &SS); 2991 if (R.isAmbiguous()) 2992 return DeclPtrTy(); 2993 2994 if (!R.empty()) { 2995 NamedDecl *Named = R.getFoundDecl(); 2996 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 2997 && "expected namespace decl"); 2998 // C++ [namespace.udir]p1: 2999 // A using-directive specifies that the names in the nominated 3000 // namespace can be used in the scope in which the 3001 // using-directive appears after the using-directive. During 3002 // unqualified name lookup (3.4.1), the names appear as if they 3003 // were declared in the nearest enclosing namespace which 3004 // contains both the using-directive and the nominated 3005 // namespace. [Note: in this context, "contains" means "contains 3006 // directly or indirectly". ] 3007 3008 // Find enclosing context containing both using-directive and 3009 // nominated namespace. 3010 NamespaceDecl *NS = getNamespaceDecl(Named); 3011 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3012 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3013 CommonAncestor = CommonAncestor->getParent(); 3014 3015 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3016 SS.getRange(), 3017 (NestedNameSpecifier *)SS.getScopeRep(), 3018 IdentLoc, Named, CommonAncestor); 3019 PushUsingDirective(S, UDir); 3020 } else { 3021 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3022 } 3023 3024 // FIXME: We ignore attributes for now. 3025 delete AttrList; 3026 return DeclPtrTy::make(UDir); 3027} 3028 3029void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3030 // If scope has associated entity, then using directive is at namespace 3031 // or translation unit scope. We add UsingDirectiveDecls, into 3032 // it's lookup structure. 3033 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3034 Ctx->addDecl(UDir); 3035 else 3036 // Otherwise it is block-sope. using-directives will affect lookup 3037 // only to the end of scope. 3038 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3039} 3040 3041 3042Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3043 AccessSpecifier AS, 3044 bool HasUsingKeyword, 3045 SourceLocation UsingLoc, 3046 const CXXScopeSpec &SS, 3047 UnqualifiedId &Name, 3048 AttributeList *AttrList, 3049 bool IsTypeName, 3050 SourceLocation TypenameLoc) { 3051 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3052 3053 switch (Name.getKind()) { 3054 case UnqualifiedId::IK_Identifier: 3055 case UnqualifiedId::IK_OperatorFunctionId: 3056 case UnqualifiedId::IK_LiteralOperatorId: 3057 case UnqualifiedId::IK_ConversionFunctionId: 3058 break; 3059 3060 case UnqualifiedId::IK_ConstructorName: 3061 case UnqualifiedId::IK_ConstructorTemplateId: 3062 // C++0x inherited constructors. 3063 if (getLangOptions().CPlusPlus0x) break; 3064 3065 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3066 << SS.getRange(); 3067 return DeclPtrTy(); 3068 3069 case UnqualifiedId::IK_DestructorName: 3070 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3071 << SS.getRange(); 3072 return DeclPtrTy(); 3073 3074 case UnqualifiedId::IK_TemplateId: 3075 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3076 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3077 return DeclPtrTy(); 3078 } 3079 3080 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3081 if (!TargetName) 3082 return DeclPtrTy(); 3083 3084 // Warn about using declarations. 3085 // TODO: store that the declaration was written without 'using' and 3086 // talk about access decls instead of using decls in the 3087 // diagnostics. 3088 if (!HasUsingKeyword) { 3089 UsingLoc = Name.getSourceRange().getBegin(); 3090 3091 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3092 << CodeModificationHint::CreateInsertion(SS.getRange().getBegin(), 3093 "using "); 3094 } 3095 3096 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3097 Name.getSourceRange().getBegin(), 3098 TargetName, AttrList, 3099 /* IsInstantiation */ false, 3100 IsTypeName, TypenameLoc); 3101 if (UD) 3102 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3103 3104 return DeclPtrTy::make(UD); 3105} 3106 3107/// Determines whether to create a using shadow decl for a particular 3108/// decl, given the set of decls existing prior to this using lookup. 3109bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3110 const LookupResult &Previous) { 3111 // Diagnose finding a decl which is not from a base class of the 3112 // current class. We do this now because there are cases where this 3113 // function will silently decide not to build a shadow decl, which 3114 // will pre-empt further diagnostics. 3115 // 3116 // We don't need to do this in C++0x because we do the check once on 3117 // the qualifier. 3118 // 3119 // FIXME: diagnose the following if we care enough: 3120 // struct A { int foo; }; 3121 // struct B : A { using A::foo; }; 3122 // template <class T> struct C : A {}; 3123 // template <class T> struct D : C<T> { using B::foo; } // <--- 3124 // This is invalid (during instantiation) in C++03 because B::foo 3125 // resolves to the using decl in B, which is not a base class of D<T>. 3126 // We can't diagnose it immediately because C<T> is an unknown 3127 // specialization. The UsingShadowDecl in D<T> then points directly 3128 // to A::foo, which will look well-formed when we instantiate. 3129 // The right solution is to not collapse the shadow-decl chain. 3130 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3131 DeclContext *OrigDC = Orig->getDeclContext(); 3132 3133 // Handle enums and anonymous structs. 3134 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3135 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3136 while (OrigRec->isAnonymousStructOrUnion()) 3137 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3138 3139 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3140 if (OrigDC == CurContext) { 3141 Diag(Using->getLocation(), 3142 diag::err_using_decl_nested_name_specifier_is_current_class) 3143 << Using->getNestedNameRange(); 3144 Diag(Orig->getLocation(), diag::note_using_decl_target); 3145 return true; 3146 } 3147 3148 Diag(Using->getNestedNameRange().getBegin(), 3149 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3150 << Using->getTargetNestedNameDecl() 3151 << cast<CXXRecordDecl>(CurContext) 3152 << Using->getNestedNameRange(); 3153 Diag(Orig->getLocation(), diag::note_using_decl_target); 3154 return true; 3155 } 3156 } 3157 3158 if (Previous.empty()) return false; 3159 3160 NamedDecl *Target = Orig; 3161 if (isa<UsingShadowDecl>(Target)) 3162 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3163 3164 // If the target happens to be one of the previous declarations, we 3165 // don't have a conflict. 3166 // 3167 // FIXME: but we might be increasing its access, in which case we 3168 // should redeclare it. 3169 NamedDecl *NonTag = 0, *Tag = 0; 3170 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3171 I != E; ++I) { 3172 NamedDecl *D = (*I)->getUnderlyingDecl(); 3173 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3174 return false; 3175 3176 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3177 } 3178 3179 if (Target->isFunctionOrFunctionTemplate()) { 3180 FunctionDecl *FD; 3181 if (isa<FunctionTemplateDecl>(Target)) 3182 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3183 else 3184 FD = cast<FunctionDecl>(Target); 3185 3186 NamedDecl *OldDecl = 0; 3187 switch (CheckOverload(FD, Previous, OldDecl)) { 3188 case Ovl_Overload: 3189 return false; 3190 3191 case Ovl_NonFunction: 3192 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3193 break; 3194 3195 // We found a decl with the exact signature. 3196 case Ovl_Match: 3197 if (isa<UsingShadowDecl>(OldDecl)) { 3198 // Silently ignore the possible conflict. 3199 return false; 3200 } 3201 3202 // If we're in a record, we want to hide the target, so we 3203 // return true (without a diagnostic) to tell the caller not to 3204 // build a shadow decl. 3205 if (CurContext->isRecord()) 3206 return true; 3207 3208 // If we're not in a record, this is an error. 3209 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3210 break; 3211 } 3212 3213 Diag(Target->getLocation(), diag::note_using_decl_target); 3214 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3215 return true; 3216 } 3217 3218 // Target is not a function. 3219 3220 if (isa<TagDecl>(Target)) { 3221 // No conflict between a tag and a non-tag. 3222 if (!Tag) return false; 3223 3224 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3225 Diag(Target->getLocation(), diag::note_using_decl_target); 3226 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3227 return true; 3228 } 3229 3230 // No conflict between a tag and a non-tag. 3231 if (!NonTag) return false; 3232 3233 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3234 Diag(Target->getLocation(), diag::note_using_decl_target); 3235 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3236 return true; 3237} 3238 3239/// Builds a shadow declaration corresponding to a 'using' declaration. 3240UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3241 UsingDecl *UD, 3242 NamedDecl *Orig) { 3243 3244 // If we resolved to another shadow declaration, just coalesce them. 3245 NamedDecl *Target = Orig; 3246 if (isa<UsingShadowDecl>(Target)) { 3247 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3248 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3249 } 3250 3251 UsingShadowDecl *Shadow 3252 = UsingShadowDecl::Create(Context, CurContext, 3253 UD->getLocation(), UD, Target); 3254 UD->addShadowDecl(Shadow); 3255 3256 if (S) 3257 PushOnScopeChains(Shadow, S); 3258 else 3259 CurContext->addDecl(Shadow); 3260 Shadow->setAccess(UD->getAccess()); 3261 3262 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3263 Shadow->setInvalidDecl(); 3264 3265 return Shadow; 3266} 3267 3268/// Hides a using shadow declaration. This is required by the current 3269/// using-decl implementation when a resolvable using declaration in a 3270/// class is followed by a declaration which would hide or override 3271/// one or more of the using decl's targets; for example: 3272/// 3273/// struct Base { void foo(int); }; 3274/// struct Derived : Base { 3275/// using Base::foo; 3276/// void foo(int); 3277/// }; 3278/// 3279/// The governing language is C++03 [namespace.udecl]p12: 3280/// 3281/// When a using-declaration brings names from a base class into a 3282/// derived class scope, member functions in the derived class 3283/// override and/or hide member functions with the same name and 3284/// parameter types in a base class (rather than conflicting). 3285/// 3286/// There are two ways to implement this: 3287/// (1) optimistically create shadow decls when they're not hidden 3288/// by existing declarations, or 3289/// (2) don't create any shadow decls (or at least don't make them 3290/// visible) until we've fully parsed/instantiated the class. 3291/// The problem with (1) is that we might have to retroactively remove 3292/// a shadow decl, which requires several O(n) operations because the 3293/// decl structures are (very reasonably) not designed for removal. 3294/// (2) avoids this but is very fiddly and phase-dependent. 3295void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3296 // Remove it from the DeclContext... 3297 Shadow->getDeclContext()->removeDecl(Shadow); 3298 3299 // ...and the scope, if applicable... 3300 if (S) { 3301 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3302 IdResolver.RemoveDecl(Shadow); 3303 } 3304 3305 // ...and the using decl. 3306 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3307 3308 // TODO: complain somehow if Shadow was used. It shouldn't 3309 // be possible for this to happen, because 3310} 3311 3312/// Builds a using declaration. 3313/// 3314/// \param IsInstantiation - Whether this call arises from an 3315/// instantiation of an unresolved using declaration. We treat 3316/// the lookup differently for these declarations. 3317NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3318 SourceLocation UsingLoc, 3319 const CXXScopeSpec &SS, 3320 SourceLocation IdentLoc, 3321 DeclarationName Name, 3322 AttributeList *AttrList, 3323 bool IsInstantiation, 3324 bool IsTypeName, 3325 SourceLocation TypenameLoc) { 3326 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3327 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3328 3329 // FIXME: We ignore attributes for now. 3330 delete AttrList; 3331 3332 if (SS.isEmpty()) { 3333 Diag(IdentLoc, diag::err_using_requires_qualname); 3334 return 0; 3335 } 3336 3337 // Do the redeclaration lookup in the current scope. 3338 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3339 ForRedeclaration); 3340 Previous.setHideTags(false); 3341 if (S) { 3342 LookupName(Previous, S); 3343 3344 // It is really dumb that we have to do this. 3345 LookupResult::Filter F = Previous.makeFilter(); 3346 while (F.hasNext()) { 3347 NamedDecl *D = F.next(); 3348 if (!isDeclInScope(D, CurContext, S)) 3349 F.erase(); 3350 } 3351 F.done(); 3352 } else { 3353 assert(IsInstantiation && "no scope in non-instantiation"); 3354 assert(CurContext->isRecord() && "scope not record in instantiation"); 3355 LookupQualifiedName(Previous, CurContext); 3356 } 3357 3358 NestedNameSpecifier *NNS = 3359 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3360 3361 // Check for invalid redeclarations. 3362 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3363 return 0; 3364 3365 // Check for bad qualifiers. 3366 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3367 return 0; 3368 3369 DeclContext *LookupContext = computeDeclContext(SS); 3370 NamedDecl *D; 3371 if (!LookupContext) { 3372 if (IsTypeName) { 3373 // FIXME: not all declaration name kinds are legal here 3374 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3375 UsingLoc, TypenameLoc, 3376 SS.getRange(), NNS, 3377 IdentLoc, Name); 3378 } else { 3379 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3380 UsingLoc, SS.getRange(), NNS, 3381 IdentLoc, Name); 3382 } 3383 } else { 3384 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3385 SS.getRange(), UsingLoc, NNS, Name, 3386 IsTypeName); 3387 } 3388 D->setAccess(AS); 3389 CurContext->addDecl(D); 3390 3391 if (!LookupContext) return D; 3392 UsingDecl *UD = cast<UsingDecl>(D); 3393 3394 if (RequireCompleteDeclContext(SS)) { 3395 UD->setInvalidDecl(); 3396 return UD; 3397 } 3398 3399 // Look up the target name. 3400 3401 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3402 3403 // Unlike most lookups, we don't always want to hide tag 3404 // declarations: tag names are visible through the using declaration 3405 // even if hidden by ordinary names, *except* in a dependent context 3406 // where it's important for the sanity of two-phase lookup. 3407 if (!IsInstantiation) 3408 R.setHideTags(false); 3409 3410 LookupQualifiedName(R, LookupContext); 3411 3412 if (R.empty()) { 3413 Diag(IdentLoc, diag::err_no_member) 3414 << Name << LookupContext << SS.getRange(); 3415 UD->setInvalidDecl(); 3416 return UD; 3417 } 3418 3419 if (R.isAmbiguous()) { 3420 UD->setInvalidDecl(); 3421 return UD; 3422 } 3423 3424 if (IsTypeName) { 3425 // If we asked for a typename and got a non-type decl, error out. 3426 if (!R.getAsSingle<TypeDecl>()) { 3427 Diag(IdentLoc, diag::err_using_typename_non_type); 3428 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3429 Diag((*I)->getUnderlyingDecl()->getLocation(), 3430 diag::note_using_decl_target); 3431 UD->setInvalidDecl(); 3432 return UD; 3433 } 3434 } else { 3435 // If we asked for a non-typename and we got a type, error out, 3436 // but only if this is an instantiation of an unresolved using 3437 // decl. Otherwise just silently find the type name. 3438 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3439 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3440 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3441 UD->setInvalidDecl(); 3442 return UD; 3443 } 3444 } 3445 3446 // C++0x N2914 [namespace.udecl]p6: 3447 // A using-declaration shall not name a namespace. 3448 if (R.getAsSingle<NamespaceDecl>()) { 3449 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3450 << SS.getRange(); 3451 UD->setInvalidDecl(); 3452 return UD; 3453 } 3454 3455 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3456 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3457 BuildUsingShadowDecl(S, UD, *I); 3458 } 3459 3460 return UD; 3461} 3462 3463/// Checks that the given using declaration is not an invalid 3464/// redeclaration. Note that this is checking only for the using decl 3465/// itself, not for any ill-formedness among the UsingShadowDecls. 3466bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3467 bool isTypeName, 3468 const CXXScopeSpec &SS, 3469 SourceLocation NameLoc, 3470 const LookupResult &Prev) { 3471 // C++03 [namespace.udecl]p8: 3472 // C++0x [namespace.udecl]p10: 3473 // A using-declaration is a declaration and can therefore be used 3474 // repeatedly where (and only where) multiple declarations are 3475 // allowed. 3476 // That's only in file contexts. 3477 if (CurContext->getLookupContext()->isFileContext()) 3478 return false; 3479 3480 NestedNameSpecifier *Qual 3481 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3482 3483 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3484 NamedDecl *D = *I; 3485 3486 bool DTypename; 3487 NestedNameSpecifier *DQual; 3488 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3489 DTypename = UD->isTypeName(); 3490 DQual = UD->getTargetNestedNameDecl(); 3491 } else if (UnresolvedUsingValueDecl *UD 3492 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3493 DTypename = false; 3494 DQual = UD->getTargetNestedNameSpecifier(); 3495 } else if (UnresolvedUsingTypenameDecl *UD 3496 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3497 DTypename = true; 3498 DQual = UD->getTargetNestedNameSpecifier(); 3499 } else continue; 3500 3501 // using decls differ if one says 'typename' and the other doesn't. 3502 // FIXME: non-dependent using decls? 3503 if (isTypeName != DTypename) continue; 3504 3505 // using decls differ if they name different scopes (but note that 3506 // template instantiation can cause this check to trigger when it 3507 // didn't before instantiation). 3508 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3509 Context.getCanonicalNestedNameSpecifier(DQual)) 3510 continue; 3511 3512 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3513 Diag(D->getLocation(), diag::note_using_decl) << 1; 3514 return true; 3515 } 3516 3517 return false; 3518} 3519 3520 3521/// Checks that the given nested-name qualifier used in a using decl 3522/// in the current context is appropriately related to the current 3523/// scope. If an error is found, diagnoses it and returns true. 3524bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3525 const CXXScopeSpec &SS, 3526 SourceLocation NameLoc) { 3527 DeclContext *NamedContext = computeDeclContext(SS); 3528 3529 if (!CurContext->isRecord()) { 3530 // C++03 [namespace.udecl]p3: 3531 // C++0x [namespace.udecl]p8: 3532 // A using-declaration for a class member shall be a member-declaration. 3533 3534 // If we weren't able to compute a valid scope, it must be a 3535 // dependent class scope. 3536 if (!NamedContext || NamedContext->isRecord()) { 3537 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3538 << SS.getRange(); 3539 return true; 3540 } 3541 3542 // Otherwise, everything is known to be fine. 3543 return false; 3544 } 3545 3546 // The current scope is a record. 3547 3548 // If the named context is dependent, we can't decide much. 3549 if (!NamedContext) { 3550 // FIXME: in C++0x, we can diagnose if we can prove that the 3551 // nested-name-specifier does not refer to a base class, which is 3552 // still possible in some cases. 3553 3554 // Otherwise we have to conservatively report that things might be 3555 // okay. 3556 return false; 3557 } 3558 3559 if (!NamedContext->isRecord()) { 3560 // Ideally this would point at the last name in the specifier, 3561 // but we don't have that level of source info. 3562 Diag(SS.getRange().getBegin(), 3563 diag::err_using_decl_nested_name_specifier_is_not_class) 3564 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3565 return true; 3566 } 3567 3568 if (getLangOptions().CPlusPlus0x) { 3569 // C++0x [namespace.udecl]p3: 3570 // In a using-declaration used as a member-declaration, the 3571 // nested-name-specifier shall name a base class of the class 3572 // being defined. 3573 3574 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3575 cast<CXXRecordDecl>(NamedContext))) { 3576 if (CurContext == NamedContext) { 3577 Diag(NameLoc, 3578 diag::err_using_decl_nested_name_specifier_is_current_class) 3579 << SS.getRange(); 3580 return true; 3581 } 3582 3583 Diag(SS.getRange().getBegin(), 3584 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3585 << (NestedNameSpecifier*) SS.getScopeRep() 3586 << cast<CXXRecordDecl>(CurContext) 3587 << SS.getRange(); 3588 return true; 3589 } 3590 3591 return false; 3592 } 3593 3594 // C++03 [namespace.udecl]p4: 3595 // A using-declaration used as a member-declaration shall refer 3596 // to a member of a base class of the class being defined [etc.]. 3597 3598 // Salient point: SS doesn't have to name a base class as long as 3599 // lookup only finds members from base classes. Therefore we can 3600 // diagnose here only if we can prove that that can't happen, 3601 // i.e. if the class hierarchies provably don't intersect. 3602 3603 // TODO: it would be nice if "definitely valid" results were cached 3604 // in the UsingDecl and UsingShadowDecl so that these checks didn't 3605 // need to be repeated. 3606 3607 struct UserData { 3608 llvm::DenseSet<const CXXRecordDecl*> Bases; 3609 3610 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 3611 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3612 Data->Bases.insert(Base); 3613 return true; 3614 } 3615 3616 bool hasDependentBases(const CXXRecordDecl *Class) { 3617 return !Class->forallBases(collect, this); 3618 } 3619 3620 /// Returns true if the base is dependent or is one of the 3621 /// accumulated base classes. 3622 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 3623 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 3624 return !Data->Bases.count(Base); 3625 } 3626 3627 bool mightShareBases(const CXXRecordDecl *Class) { 3628 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 3629 } 3630 }; 3631 3632 UserData Data; 3633 3634 // Returns false if we find a dependent base. 3635 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 3636 return false; 3637 3638 // Returns false if the class has a dependent base or if it or one 3639 // of its bases is present in the base set of the current context. 3640 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 3641 return false; 3642 3643 Diag(SS.getRange().getBegin(), 3644 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3645 << (NestedNameSpecifier*) SS.getScopeRep() 3646 << cast<CXXRecordDecl>(CurContext) 3647 << SS.getRange(); 3648 3649 return true; 3650} 3651 3652Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3653 SourceLocation NamespaceLoc, 3654 SourceLocation AliasLoc, 3655 IdentifierInfo *Alias, 3656 const CXXScopeSpec &SS, 3657 SourceLocation IdentLoc, 3658 IdentifierInfo *Ident) { 3659 3660 // Lookup the namespace name. 3661 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3662 LookupParsedName(R, S, &SS); 3663 3664 // Check if we have a previous declaration with the same name. 3665 if (NamedDecl *PrevDecl 3666 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3667 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3668 // We already have an alias with the same name that points to the same 3669 // namespace, so don't create a new one. 3670 if (!R.isAmbiguous() && !R.empty() && 3671 AD->getNamespace() == getNamespaceDecl(R.getFoundDecl())) 3672 return DeclPtrTy(); 3673 } 3674 3675 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3676 diag::err_redefinition_different_kind; 3677 Diag(AliasLoc, DiagID) << Alias; 3678 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3679 return DeclPtrTy(); 3680 } 3681 3682 if (R.isAmbiguous()) 3683 return DeclPtrTy(); 3684 3685 if (R.empty()) { 3686 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3687 return DeclPtrTy(); 3688 } 3689 3690 NamespaceAliasDecl *AliasDecl = 3691 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3692 Alias, SS.getRange(), 3693 (NestedNameSpecifier *)SS.getScopeRep(), 3694 IdentLoc, R.getFoundDecl()); 3695 3696 CurContext->addDecl(AliasDecl); 3697 return DeclPtrTy::make(AliasDecl); 3698} 3699 3700void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3701 CXXConstructorDecl *Constructor) { 3702 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3703 !Constructor->isUsed()) && 3704 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3705 3706 CXXRecordDecl *ClassDecl 3707 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3708 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3709 3710 DeclContext *PreviousContext = CurContext; 3711 CurContext = Constructor; 3712 if (SetBaseOrMemberInitializers(Constructor, 0, 0, true, false)) { 3713 Diag(CurrentLocation, diag::note_member_synthesized_at) 3714 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 3715 Constructor->setInvalidDecl(); 3716 } else { 3717 Constructor->setUsed(); 3718 } 3719 CurContext = PreviousContext; 3720} 3721 3722void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3723 CXXDestructorDecl *Destructor) { 3724 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3725 "DefineImplicitDestructor - call it for implicit default dtor"); 3726 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3727 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3728 3729 DeclContext *PreviousContext = CurContext; 3730 CurContext = Destructor; 3731 3732 // C++ [class.dtor] p5 3733 // Before the implicitly-declared default destructor for a class is 3734 // implicitly defined, all the implicitly-declared default destructors 3735 // for its base class and its non-static data members shall have been 3736 // implicitly defined. 3737 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3738 E = ClassDecl->bases_end(); Base != E; ++Base) { 3739 CXXRecordDecl *BaseClassDecl 3740 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3741 if (!BaseClassDecl->hasTrivialDestructor()) { 3742 if (CXXDestructorDecl *BaseDtor = 3743 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 3744 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 3745 else 3746 assert(false && 3747 "DefineImplicitDestructor - missing dtor in a base class"); 3748 } 3749 } 3750 3751 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3752 E = ClassDecl->field_end(); Field != E; ++Field) { 3753 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3754 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3755 FieldType = Array->getElementType(); 3756 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3757 CXXRecordDecl *FieldClassDecl 3758 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3759 if (!FieldClassDecl->hasTrivialDestructor()) { 3760 if (CXXDestructorDecl *FieldDtor = 3761 const_cast<CXXDestructorDecl*>( 3762 FieldClassDecl->getDestructor(Context))) 3763 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 3764 else 3765 assert(false && 3766 "DefineImplicitDestructor - missing dtor in class of a data member"); 3767 } 3768 } 3769 } 3770 3771 // FIXME: If CheckDestructor fails, we should emit a note about where the 3772 // implicit destructor was needed. 3773 if (CheckDestructor(Destructor)) { 3774 Diag(CurrentLocation, diag::note_member_synthesized_at) 3775 << CXXDestructor << Context.getTagDeclType(ClassDecl); 3776 3777 Destructor->setInvalidDecl(); 3778 CurContext = PreviousContext; 3779 3780 return; 3781 } 3782 CurContext = PreviousContext; 3783 3784 Destructor->setUsed(); 3785} 3786 3787void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3788 CXXMethodDecl *MethodDecl) { 3789 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3790 MethodDecl->getOverloadedOperator() == OO_Equal && 3791 !MethodDecl->isUsed()) && 3792 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3793 3794 CXXRecordDecl *ClassDecl 3795 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3796 3797 DeclContext *PreviousContext = CurContext; 3798 CurContext = MethodDecl; 3799 3800 // C++[class.copy] p12 3801 // Before the implicitly-declared copy assignment operator for a class is 3802 // implicitly defined, all implicitly-declared copy assignment operators 3803 // for its direct base classes and its nonstatic data members shall have 3804 // been implicitly defined. 3805 bool err = false; 3806 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3807 E = ClassDecl->bases_end(); Base != E; ++Base) { 3808 CXXRecordDecl *BaseClassDecl 3809 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3810 if (CXXMethodDecl *BaseAssignOpMethod = 3811 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3812 BaseClassDecl)) 3813 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3814 } 3815 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3816 E = ClassDecl->field_end(); Field != E; ++Field) { 3817 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3818 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3819 FieldType = Array->getElementType(); 3820 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3821 CXXRecordDecl *FieldClassDecl 3822 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3823 if (CXXMethodDecl *FieldAssignOpMethod = 3824 getAssignOperatorMethod(CurrentLocation, MethodDecl->getParamDecl(0), 3825 FieldClassDecl)) 3826 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3827 } else if (FieldType->isReferenceType()) { 3828 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3829 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3830 Diag(Field->getLocation(), diag::note_declared_at); 3831 Diag(CurrentLocation, diag::note_first_required_here); 3832 err = true; 3833 } else if (FieldType.isConstQualified()) { 3834 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3835 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3836 Diag(Field->getLocation(), diag::note_declared_at); 3837 Diag(CurrentLocation, diag::note_first_required_here); 3838 err = true; 3839 } 3840 } 3841 if (!err) 3842 MethodDecl->setUsed(); 3843 3844 CurContext = PreviousContext; 3845} 3846 3847CXXMethodDecl * 3848Sema::getAssignOperatorMethod(SourceLocation CurrentLocation, 3849 ParmVarDecl *ParmDecl, 3850 CXXRecordDecl *ClassDecl) { 3851 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3852 QualType RHSType(LHSType); 3853 // If class's assignment operator argument is const/volatile qualified, 3854 // look for operator = (const/volatile B&). Otherwise, look for 3855 // operator = (B&). 3856 RHSType = Context.getCVRQualifiedType(RHSType, 3857 ParmDecl->getType().getCVRQualifiers()); 3858 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3859 LHSType, 3860 SourceLocation())); 3861 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3862 RHSType, 3863 CurrentLocation)); 3864 Expr *Args[2] = { &*LHS, &*RHS }; 3865 OverloadCandidateSet CandidateSet(CurrentLocation); 3866 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3867 CandidateSet); 3868 OverloadCandidateSet::iterator Best; 3869 if (BestViableFunction(CandidateSet, CurrentLocation, Best) == OR_Success) 3870 return cast<CXXMethodDecl>(Best->Function); 3871 assert(false && 3872 "getAssignOperatorMethod - copy assignment operator method not found"); 3873 return 0; 3874} 3875 3876void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3877 CXXConstructorDecl *CopyConstructor, 3878 unsigned TypeQuals) { 3879 assert((CopyConstructor->isImplicit() && 3880 CopyConstructor->isCopyConstructor(TypeQuals) && 3881 !CopyConstructor->isUsed()) && 3882 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3883 3884 CXXRecordDecl *ClassDecl 3885 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3886 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3887 3888 DeclContext *PreviousContext = CurContext; 3889 CurContext = CopyConstructor; 3890 3891 // C++ [class.copy] p209 3892 // Before the implicitly-declared copy constructor for a class is 3893 // implicitly defined, all the implicitly-declared copy constructors 3894 // for its base class and its non-static data members shall have been 3895 // implicitly defined. 3896 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3897 Base != ClassDecl->bases_end(); ++Base) { 3898 CXXRecordDecl *BaseClassDecl 3899 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3900 if (CXXConstructorDecl *BaseCopyCtor = 3901 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 3902 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3903 } 3904 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3905 FieldEnd = ClassDecl->field_end(); 3906 Field != FieldEnd; ++Field) { 3907 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3908 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3909 FieldType = Array->getElementType(); 3910 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3911 CXXRecordDecl *FieldClassDecl 3912 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3913 if (CXXConstructorDecl *FieldCopyCtor = 3914 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 3915 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3916 } 3917 } 3918 CopyConstructor->setUsed(); 3919 3920 CurContext = PreviousContext; 3921} 3922 3923Sema::OwningExprResult 3924Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3925 CXXConstructorDecl *Constructor, 3926 MultiExprArg ExprArgs, 3927 bool RequiresZeroInit, 3928 bool BaseInitialization) { 3929 bool Elidable = false; 3930 3931 // C++ [class.copy]p15: 3932 // Whenever a temporary class object is copied using a copy constructor, and 3933 // this object and the copy have the same cv-unqualified type, an 3934 // implementation is permitted to treat the original and the copy as two 3935 // different ways of referring to the same object and not perform a copy at 3936 // all, even if the class copy constructor or destructor have side effects. 3937 3938 // FIXME: Is this enough? 3939 if (Constructor->isCopyConstructor()) { 3940 Expr *E = ((Expr **)ExprArgs.get())[0]; 3941 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3942 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3943 E = ICE->getSubExpr(); 3944 if (CXXFunctionalCastExpr *FCE = dyn_cast<CXXFunctionalCastExpr>(E)) 3945 E = FCE->getSubExpr(); 3946 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 3947 E = BE->getSubExpr(); 3948 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3949 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3950 E = ICE->getSubExpr(); 3951 3952 if (CallExpr *CE = dyn_cast<CallExpr>(E)) 3953 Elidable = !CE->getCallReturnType()->isReferenceType(); 3954 else if (isa<CXXTemporaryObjectExpr>(E)) 3955 Elidable = true; 3956 else if (isa<CXXConstructExpr>(E)) 3957 Elidable = true; 3958 } 3959 3960 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 3961 Elidable, move(ExprArgs), RequiresZeroInit, 3962 BaseInitialization); 3963} 3964 3965/// BuildCXXConstructExpr - Creates a complete call to a constructor, 3966/// including handling of its default argument expressions. 3967Sema::OwningExprResult 3968Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3969 CXXConstructorDecl *Constructor, bool Elidable, 3970 MultiExprArg ExprArgs, 3971 bool RequiresZeroInit, 3972 bool BaseInitialization) { 3973 unsigned NumExprs = ExprArgs.size(); 3974 Expr **Exprs = (Expr **)ExprArgs.release(); 3975 3976 MarkDeclarationReferenced(ConstructLoc, Constructor); 3977 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 3978 Constructor, Elidable, Exprs, NumExprs, 3979 RequiresZeroInit, BaseInitialization)); 3980} 3981 3982bool Sema::InitializeVarWithConstructor(VarDecl *VD, 3983 CXXConstructorDecl *Constructor, 3984 MultiExprArg Exprs) { 3985 OwningExprResult TempResult = 3986 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 3987 move(Exprs)); 3988 if (TempResult.isInvalid()) 3989 return true; 3990 3991 Expr *Temp = TempResult.takeAs<Expr>(); 3992 MarkDeclarationReferenced(VD->getLocation(), Constructor); 3993 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 3994 VD->setInit(Temp); 3995 3996 return false; 3997} 3998 3999void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4000 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4001 if (!ClassDecl->hasTrivialDestructor()) { 4002 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4003 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4004 CheckDestructorAccess(VD->getLocation(), Record); 4005 } 4006} 4007 4008/// AddCXXDirectInitializerToDecl - This action is called immediately after 4009/// ActOnDeclarator, when a C++ direct initializer is present. 4010/// e.g: "int x(1);" 4011void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4012 SourceLocation LParenLoc, 4013 MultiExprArg Exprs, 4014 SourceLocation *CommaLocs, 4015 SourceLocation RParenLoc) { 4016 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4017 Decl *RealDecl = Dcl.getAs<Decl>(); 4018 4019 // If there is no declaration, there was an error parsing it. Just ignore 4020 // the initializer. 4021 if (RealDecl == 0) 4022 return; 4023 4024 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4025 if (!VDecl) { 4026 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4027 RealDecl->setInvalidDecl(); 4028 return; 4029 } 4030 4031 // We will represent direct-initialization similarly to copy-initialization: 4032 // int x(1); -as-> int x = 1; 4033 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4034 // 4035 // Clients that want to distinguish between the two forms, can check for 4036 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4037 // A major benefit is that clients that don't particularly care about which 4038 // exactly form was it (like the CodeGen) can handle both cases without 4039 // special case code. 4040 4041 // If either the declaration has a dependent type or if any of the expressions 4042 // is type-dependent, we represent the initialization via a ParenListExpr for 4043 // later use during template instantiation. 4044 if (VDecl->getType()->isDependentType() || 4045 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4046 // Let clients know that initialization was done with a direct initializer. 4047 VDecl->setCXXDirectInitializer(true); 4048 4049 // Store the initialization expressions as a ParenListExpr. 4050 unsigned NumExprs = Exprs.size(); 4051 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4052 (Expr **)Exprs.release(), 4053 NumExprs, RParenLoc)); 4054 return; 4055 } 4056 4057 4058 // C++ 8.5p11: 4059 // The form of initialization (using parentheses or '=') is generally 4060 // insignificant, but does matter when the entity being initialized has a 4061 // class type. 4062 QualType DeclInitType = VDecl->getType(); 4063 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4064 DeclInitType = Context.getBaseElementType(Array); 4065 4066 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4067 diag::err_typecheck_decl_incomplete_type)) { 4068 VDecl->setInvalidDecl(); 4069 return; 4070 } 4071 4072 // The variable can not have an abstract class type. 4073 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4074 diag::err_abstract_type_in_decl, 4075 AbstractVariableType)) 4076 VDecl->setInvalidDecl(); 4077 4078 const VarDecl *Def; 4079 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4080 Diag(VDecl->getLocation(), diag::err_redefinition) 4081 << VDecl->getDeclName(); 4082 Diag(Def->getLocation(), diag::note_previous_definition); 4083 VDecl->setInvalidDecl(); 4084 return; 4085 } 4086 4087 // Capture the variable that is being initialized and the style of 4088 // initialization. 4089 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4090 4091 // FIXME: Poor source location information. 4092 InitializationKind Kind 4093 = InitializationKind::CreateDirect(VDecl->getLocation(), 4094 LParenLoc, RParenLoc); 4095 4096 InitializationSequence InitSeq(*this, Entity, Kind, 4097 (Expr**)Exprs.get(), Exprs.size()); 4098 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4099 if (Result.isInvalid()) { 4100 VDecl->setInvalidDecl(); 4101 return; 4102 } 4103 4104 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4105 VDecl->setInit(Result.takeAs<Expr>()); 4106 VDecl->setCXXDirectInitializer(true); 4107 4108 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4109 FinalizeVarWithDestructor(VDecl, Record); 4110} 4111 4112/// \brief Add the applicable constructor candidates for an initialization 4113/// by constructor. 4114static void AddConstructorInitializationCandidates(Sema &SemaRef, 4115 QualType ClassType, 4116 Expr **Args, 4117 unsigned NumArgs, 4118 InitializationKind Kind, 4119 OverloadCandidateSet &CandidateSet) { 4120 // C++ [dcl.init]p14: 4121 // If the initialization is direct-initialization, or if it is 4122 // copy-initialization where the cv-unqualified version of the 4123 // source type is the same class as, or a derived class of, the 4124 // class of the destination, constructors are considered. The 4125 // applicable constructors are enumerated (13.3.1.3), and the 4126 // best one is chosen through overload resolution (13.3). The 4127 // constructor so selected is called to initialize the object, 4128 // with the initializer expression(s) as its argument(s). If no 4129 // constructor applies, or the overload resolution is ambiguous, 4130 // the initialization is ill-formed. 4131 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 4132 assert(ClassRec && "Can only initialize a class type here"); 4133 4134 // FIXME: When we decide not to synthesize the implicitly-declared 4135 // constructors, we'll need to make them appear here. 4136 4137 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 4138 DeclarationName ConstructorName 4139 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 4140 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 4141 DeclContext::lookup_const_iterator Con, ConEnd; 4142 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 4143 Con != ConEnd; ++Con) { 4144 // Find the constructor (which may be a template). 4145 CXXConstructorDecl *Constructor = 0; 4146 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 4147 if (ConstructorTmpl) 4148 Constructor 4149 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 4150 else 4151 Constructor = cast<CXXConstructorDecl>(*Con); 4152 4153 if ((Kind.getKind() == InitializationKind::IK_Direct) || 4154 (Kind.getKind() == InitializationKind::IK_Value) || 4155 (Kind.getKind() == InitializationKind::IK_Copy && 4156 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 4157 ((Kind.getKind() == InitializationKind::IK_Default) && 4158 Constructor->isDefaultConstructor())) { 4159 if (ConstructorTmpl) 4160 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, 4161 ConstructorTmpl->getAccess(), 4162 /*ExplicitArgs*/ 0, 4163 Args, NumArgs, CandidateSet); 4164 else 4165 SemaRef.AddOverloadCandidate(Constructor, Constructor->getAccess(), 4166 Args, NumArgs, CandidateSet); 4167 } 4168 } 4169} 4170 4171/// \brief Attempt to perform initialization by constructor 4172/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 4173/// copy-initialization. 4174/// 4175/// This routine determines whether initialization by constructor is possible, 4176/// but it does not emit any diagnostics in the case where the initialization 4177/// is ill-formed. 4178/// 4179/// \param ClassType the type of the object being initialized, which must have 4180/// class type. 4181/// 4182/// \param Args the arguments provided to initialize the object 4183/// 4184/// \param NumArgs the number of arguments provided to initialize the object 4185/// 4186/// \param Kind the type of initialization being performed 4187/// 4188/// \returns the constructor used to initialize the object, if successful. 4189/// Otherwise, emits a diagnostic and returns NULL. 4190CXXConstructorDecl * 4191Sema::TryInitializationByConstructor(QualType ClassType, 4192 Expr **Args, unsigned NumArgs, 4193 SourceLocation Loc, 4194 InitializationKind Kind) { 4195 // Build the overload candidate set 4196 OverloadCandidateSet CandidateSet(Loc); 4197 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 4198 CandidateSet); 4199 4200 // Determine whether we found a constructor we can use. 4201 OverloadCandidateSet::iterator Best; 4202 switch (BestViableFunction(CandidateSet, Loc, Best)) { 4203 case OR_Success: 4204 case OR_Deleted: 4205 // We found a constructor. Return it. 4206 return cast<CXXConstructorDecl>(Best->Function); 4207 4208 case OR_No_Viable_Function: 4209 case OR_Ambiguous: 4210 // Overload resolution failed. Return nothing. 4211 return 0; 4212 } 4213 4214 // Silence GCC warning 4215 return 0; 4216} 4217 4218/// \brief Given a constructor and the set of arguments provided for the 4219/// constructor, convert the arguments and add any required default arguments 4220/// to form a proper call to this constructor. 4221/// 4222/// \returns true if an error occurred, false otherwise. 4223bool 4224Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4225 MultiExprArg ArgsPtr, 4226 SourceLocation Loc, 4227 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4228 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4229 unsigned NumArgs = ArgsPtr.size(); 4230 Expr **Args = (Expr **)ArgsPtr.get(); 4231 4232 const FunctionProtoType *Proto 4233 = Constructor->getType()->getAs<FunctionProtoType>(); 4234 assert(Proto && "Constructor without a prototype?"); 4235 unsigned NumArgsInProto = Proto->getNumArgs(); 4236 4237 // If too few arguments are available, we'll fill in the rest with defaults. 4238 if (NumArgs < NumArgsInProto) 4239 ConvertedArgs.reserve(NumArgsInProto); 4240 else 4241 ConvertedArgs.reserve(NumArgs); 4242 4243 VariadicCallType CallType = 4244 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4245 llvm::SmallVector<Expr *, 8> AllArgs; 4246 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4247 Proto, 0, Args, NumArgs, AllArgs, 4248 CallType); 4249 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4250 ConvertedArgs.push_back(AllArgs[i]); 4251 return Invalid; 4252} 4253 4254/// CompareReferenceRelationship - Compare the two types T1 and T2 to 4255/// determine whether they are reference-related, 4256/// reference-compatible, reference-compatible with added 4257/// qualification, or incompatible, for use in C++ initialization by 4258/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 4259/// type, and the first type (T1) is the pointee type of the reference 4260/// type being initialized. 4261Sema::ReferenceCompareResult 4262Sema::CompareReferenceRelationship(SourceLocation Loc, 4263 QualType OrigT1, QualType OrigT2, 4264 bool& DerivedToBase) { 4265 assert(!OrigT1->isReferenceType() && 4266 "T1 must be the pointee type of the reference type"); 4267 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 4268 4269 QualType T1 = Context.getCanonicalType(OrigT1); 4270 QualType T2 = Context.getCanonicalType(OrigT2); 4271 Qualifiers T1Quals, T2Quals; 4272 QualType UnqualT1 = Context.getUnqualifiedArrayType(T1, T1Quals); 4273 QualType UnqualT2 = Context.getUnqualifiedArrayType(T2, T2Quals); 4274 4275 // C++ [dcl.init.ref]p4: 4276 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 4277 // reference-related to "cv2 T2" if T1 is the same type as T2, or 4278 // T1 is a base class of T2. 4279 if (UnqualT1 == UnqualT2) 4280 DerivedToBase = false; 4281 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 4282 !RequireCompleteType(Loc, OrigT2, PDiag()) && 4283 IsDerivedFrom(UnqualT2, UnqualT1)) 4284 DerivedToBase = true; 4285 else 4286 return Ref_Incompatible; 4287 4288 // At this point, we know that T1 and T2 are reference-related (at 4289 // least). 4290 4291 // If the type is an array type, promote the element qualifiers to the type 4292 // for comparison. 4293 if (isa<ArrayType>(T1) && T1Quals) 4294 T1 = Context.getQualifiedType(UnqualT1, T1Quals); 4295 if (isa<ArrayType>(T2) && T2Quals) 4296 T2 = Context.getQualifiedType(UnqualT2, T2Quals); 4297 4298 // C++ [dcl.init.ref]p4: 4299 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 4300 // reference-related to T2 and cv1 is the same cv-qualification 4301 // as, or greater cv-qualification than, cv2. For purposes of 4302 // overload resolution, cases for which cv1 is greater 4303 // cv-qualification than cv2 are identified as 4304 // reference-compatible with added qualification (see 13.3.3.2). 4305 if (T1Quals.getCVRQualifiers() == T2Quals.getCVRQualifiers()) 4306 return Ref_Compatible; 4307 else if (T1.isMoreQualifiedThan(T2)) 4308 return Ref_Compatible_With_Added_Qualification; 4309 else 4310 return Ref_Related; 4311} 4312 4313/// CheckReferenceInit - Check the initialization of a reference 4314/// variable with the given initializer (C++ [dcl.init.ref]). Init is 4315/// the initializer (either a simple initializer or an initializer 4316/// list), and DeclType is the type of the declaration. When ICS is 4317/// non-null, this routine will compute the implicit conversion 4318/// sequence according to C++ [over.ics.ref] and will not produce any 4319/// diagnostics; when ICS is null, it will emit diagnostics when any 4320/// errors are found. Either way, a return value of true indicates 4321/// that there was a failure, a return value of false indicates that 4322/// the reference initialization succeeded. 4323/// 4324/// When @p SuppressUserConversions, user-defined conversions are 4325/// suppressed. 4326/// When @p AllowExplicit, we also permit explicit user-defined 4327/// conversion functions. 4328/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 4329/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 4330/// This is used when this is called from a C-style cast. 4331bool 4332Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 4333 SourceLocation DeclLoc, 4334 bool SuppressUserConversions, 4335 bool AllowExplicit, bool ForceRValue, 4336 ImplicitConversionSequence *ICS, 4337 bool IgnoreBaseAccess) { 4338 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 4339 4340 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 4341 QualType T2 = Init->getType(); 4342 4343 // If the initializer is the address of an overloaded function, try 4344 // to resolve the overloaded function. If all goes well, T2 is the 4345 // type of the resulting function. 4346 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 4347 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 4348 ICS != 0); 4349 if (Fn) { 4350 // Since we're performing this reference-initialization for 4351 // real, update the initializer with the resulting function. 4352 if (!ICS) { 4353 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 4354 return true; 4355 4356 Init = FixOverloadedFunctionReference(Init, Fn); 4357 } 4358 4359 T2 = Fn->getType(); 4360 } 4361 } 4362 4363 // Compute some basic properties of the types and the initializer. 4364 bool isRValRef = DeclType->isRValueReferenceType(); 4365 bool DerivedToBase = false; 4366 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 4367 Init->isLvalue(Context); 4368 ReferenceCompareResult RefRelationship 4369 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 4370 4371 // Most paths end in a failed conversion. 4372 if (ICS) { 4373 ICS->setBad(); 4374 ICS->Bad.init(BadConversionSequence::no_conversion, Init, DeclType); 4375 } 4376 4377 // C++ [dcl.init.ref]p5: 4378 // A reference to type "cv1 T1" is initialized by an expression 4379 // of type "cv2 T2" as follows: 4380 4381 // -- If the initializer expression 4382 4383 // Rvalue references cannot bind to lvalues (N2812). 4384 // There is absolutely no situation where they can. In particular, note that 4385 // this is ill-formed, even if B has a user-defined conversion to A&&: 4386 // B b; 4387 // A&& r = b; 4388 if (isRValRef && InitLvalue == Expr::LV_Valid) { 4389 if (!ICS) 4390 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4391 << Init->getSourceRange(); 4392 return true; 4393 } 4394 4395 bool BindsDirectly = false; 4396 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 4397 // reference-compatible with "cv2 T2," or 4398 // 4399 // Note that the bit-field check is skipped if we are just computing 4400 // the implicit conversion sequence (C++ [over.best.ics]p2). 4401 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 4402 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4403 BindsDirectly = true; 4404 4405 if (ICS) { 4406 // C++ [over.ics.ref]p1: 4407 // When a parameter of reference type binds directly (8.5.3) 4408 // to an argument expression, the implicit conversion sequence 4409 // is the identity conversion, unless the argument expression 4410 // has a type that is a derived class of the parameter type, 4411 // in which case the implicit conversion sequence is a 4412 // derived-to-base Conversion (13.3.3.1). 4413 ICS->setStandard(); 4414 ICS->Standard.First = ICK_Identity; 4415 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4416 ICS->Standard.Third = ICK_Identity; 4417 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4418 ICS->Standard.setToType(0, T2); 4419 ICS->Standard.setToType(1, T1); 4420 ICS->Standard.setToType(2, T1); 4421 ICS->Standard.ReferenceBinding = true; 4422 ICS->Standard.DirectBinding = true; 4423 ICS->Standard.RRefBinding = false; 4424 ICS->Standard.CopyConstructor = 0; 4425 4426 // Nothing more to do: the inaccessibility/ambiguity check for 4427 // derived-to-base conversions is suppressed when we're 4428 // computing the implicit conversion sequence (C++ 4429 // [over.best.ics]p2). 4430 return false; 4431 } else { 4432 // Perform the conversion. 4433 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4434 if (DerivedToBase) 4435 CK = CastExpr::CK_DerivedToBase; 4436 else if(CheckExceptionSpecCompatibility(Init, T1)) 4437 return true; 4438 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 4439 } 4440 } 4441 4442 // -- has a class type (i.e., T2 is a class type) and can be 4443 // implicitly converted to an lvalue of type "cv3 T3," 4444 // where "cv1 T1" is reference-compatible with "cv3 T3" 4445 // 92) (this conversion is selected by enumerating the 4446 // applicable conversion functions (13.3.1.6) and choosing 4447 // the best one through overload resolution (13.3)), 4448 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 4449 !RequireCompleteType(DeclLoc, T2, 0)) { 4450 CXXRecordDecl *T2RecordDecl 4451 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 4452 4453 OverloadCandidateSet CandidateSet(DeclLoc); 4454 const UnresolvedSetImpl *Conversions 4455 = T2RecordDecl->getVisibleConversionFunctions(); 4456 for (UnresolvedSetImpl::iterator I = Conversions->begin(), 4457 E = Conversions->end(); I != E; ++I) { 4458 NamedDecl *D = *I; 4459 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); 4460 if (isa<UsingShadowDecl>(D)) 4461 D = cast<UsingShadowDecl>(D)->getTargetDecl(); 4462 4463 FunctionTemplateDecl *ConvTemplate 4464 = dyn_cast<FunctionTemplateDecl>(D); 4465 CXXConversionDecl *Conv; 4466 if (ConvTemplate) 4467 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 4468 else 4469 Conv = cast<CXXConversionDecl>(D); 4470 4471 // If the conversion function doesn't return a reference type, 4472 // it can't be considered for this conversion. 4473 if (Conv->getConversionType()->isLValueReferenceType() && 4474 (AllowExplicit || !Conv->isExplicit())) { 4475 if (ConvTemplate) 4476 AddTemplateConversionCandidate(ConvTemplate, I.getAccess(), ActingDC, 4477 Init, DeclType, CandidateSet); 4478 else 4479 AddConversionCandidate(Conv, I.getAccess(), ActingDC, Init, 4480 DeclType, CandidateSet); 4481 } 4482 } 4483 4484 OverloadCandidateSet::iterator Best; 4485 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 4486 case OR_Success: 4487 // This is a direct binding. 4488 BindsDirectly = true; 4489 4490 if (ICS) { 4491 // C++ [over.ics.ref]p1: 4492 // 4493 // [...] If the parameter binds directly to the result of 4494 // applying a conversion function to the argument 4495 // expression, the implicit conversion sequence is a 4496 // user-defined conversion sequence (13.3.3.1.2), with the 4497 // second standard conversion sequence either an identity 4498 // conversion or, if the conversion function returns an 4499 // entity of a type that is a derived class of the parameter 4500 // type, a derived-to-base Conversion. 4501 ICS->setUserDefined(); 4502 ICS->UserDefined.Before = Best->Conversions[0].Standard; 4503 ICS->UserDefined.After = Best->FinalConversion; 4504 ICS->UserDefined.ConversionFunction = Best->Function; 4505 ICS->UserDefined.EllipsisConversion = false; 4506 assert(ICS->UserDefined.After.ReferenceBinding && 4507 ICS->UserDefined.After.DirectBinding && 4508 "Expected a direct reference binding!"); 4509 return false; 4510 } else { 4511 OwningExprResult InitConversion = 4512 BuildCXXCastArgument(DeclLoc, QualType(), 4513 CastExpr::CK_UserDefinedConversion, 4514 cast<CXXMethodDecl>(Best->Function), 4515 Owned(Init)); 4516 Init = InitConversion.takeAs<Expr>(); 4517 4518 if (CheckExceptionSpecCompatibility(Init, T1)) 4519 return true; 4520 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 4521 /*isLvalue=*/true); 4522 } 4523 break; 4524 4525 case OR_Ambiguous: 4526 if (ICS) { 4527 ICS->setAmbiguous(); 4528 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 4529 Cand != CandidateSet.end(); ++Cand) 4530 if (Cand->Viable) 4531 ICS->Ambiguous.addConversion(Cand->Function); 4532 break; 4533 } 4534 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 4535 << Init->getSourceRange(); 4536 PrintOverloadCandidates(CandidateSet, OCD_ViableCandidates, &Init, 1); 4537 return true; 4538 4539 case OR_No_Viable_Function: 4540 case OR_Deleted: 4541 // There was no suitable conversion, or we found a deleted 4542 // conversion; continue with other checks. 4543 break; 4544 } 4545 } 4546 4547 if (BindsDirectly) { 4548 // C++ [dcl.init.ref]p4: 4549 // [...] In all cases where the reference-related or 4550 // reference-compatible relationship of two types is used to 4551 // establish the validity of a reference binding, and T1 is a 4552 // base class of T2, a program that necessitates such a binding 4553 // is ill-formed if T1 is an inaccessible (clause 11) or 4554 // ambiguous (10.2) base class of T2. 4555 // 4556 // Note that we only check this condition when we're allowed to 4557 // complain about errors, because we should not be checking for 4558 // ambiguity (or inaccessibility) unless the reference binding 4559 // actually happens. 4560 if (DerivedToBase) 4561 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 4562 Init->getSourceRange(), 4563 IgnoreBaseAccess); 4564 else 4565 return false; 4566 } 4567 4568 // -- Otherwise, the reference shall be to a non-volatile const 4569 // type (i.e., cv1 shall be const), or the reference shall be an 4570 // rvalue reference and the initializer expression shall be an rvalue. 4571 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4572 if (!ICS) 4573 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4574 << T1.isVolatileQualified() 4575 << T1 << int(InitLvalue != Expr::LV_Valid) 4576 << T2 << Init->getSourceRange(); 4577 return true; 4578 } 4579 4580 // -- If the initializer expression is an rvalue, with T2 a 4581 // class type, and "cv1 T1" is reference-compatible with 4582 // "cv2 T2," the reference is bound in one of the 4583 // following ways (the choice is implementation-defined): 4584 // 4585 // -- The reference is bound to the object represented by 4586 // the rvalue (see 3.10) or to a sub-object within that 4587 // object. 4588 // 4589 // -- A temporary of type "cv1 T2" [sic] is created, and 4590 // a constructor is called to copy the entire rvalue 4591 // object into the temporary. The reference is bound to 4592 // the temporary or to a sub-object within the 4593 // temporary. 4594 // 4595 // The constructor that would be used to make the copy 4596 // shall be callable whether or not the copy is actually 4597 // done. 4598 // 4599 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4600 // freedom, so we will always take the first option and never build 4601 // a temporary in this case. FIXME: We will, however, have to check 4602 // for the presence of a copy constructor in C++98/03 mode. 4603 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4604 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4605 if (ICS) { 4606 ICS->setStandard(); 4607 ICS->Standard.First = ICK_Identity; 4608 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4609 ICS->Standard.Third = ICK_Identity; 4610 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4611 ICS->Standard.setToType(0, T2); 4612 ICS->Standard.setToType(1, T1); 4613 ICS->Standard.setToType(2, T1); 4614 ICS->Standard.ReferenceBinding = true; 4615 ICS->Standard.DirectBinding = false; 4616 ICS->Standard.RRefBinding = isRValRef; 4617 ICS->Standard.CopyConstructor = 0; 4618 } else { 4619 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4620 if (DerivedToBase) 4621 CK = CastExpr::CK_DerivedToBase; 4622 else if(CheckExceptionSpecCompatibility(Init, T1)) 4623 return true; 4624 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4625 } 4626 return false; 4627 } 4628 4629 // -- Otherwise, a temporary of type "cv1 T1" is created and 4630 // initialized from the initializer expression using the 4631 // rules for a non-reference copy initialization (8.5). The 4632 // reference is then bound to the temporary. If T1 is 4633 // reference-related to T2, cv1 must be the same 4634 // cv-qualification as, or greater cv-qualification than, 4635 // cv2; otherwise, the program is ill-formed. 4636 if (RefRelationship == Ref_Related) { 4637 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4638 // we would be reference-compatible or reference-compatible with 4639 // added qualification. But that wasn't the case, so the reference 4640 // initialization fails. 4641 if (!ICS) 4642 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4643 << T1 << int(InitLvalue != Expr::LV_Valid) 4644 << T2 << Init->getSourceRange(); 4645 return true; 4646 } 4647 4648 // If at least one of the types is a class type, the types are not 4649 // related, and we aren't allowed any user conversions, the 4650 // reference binding fails. This case is important for breaking 4651 // recursion, since TryImplicitConversion below will attempt to 4652 // create a temporary through the use of a copy constructor. 4653 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4654 (T1->isRecordType() || T2->isRecordType())) { 4655 if (!ICS) 4656 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4657 << DeclType << Init->getType() << AA_Initializing << Init->getSourceRange(); 4658 return true; 4659 } 4660 4661 // Actually try to convert the initializer to T1. 4662 if (ICS) { 4663 // C++ [over.ics.ref]p2: 4664 // 4665 // When a parameter of reference type is not bound directly to 4666 // an argument expression, the conversion sequence is the one 4667 // required to convert the argument expression to the 4668 // underlying type of the reference according to 4669 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4670 // to copy-initializing a temporary of the underlying type with 4671 // the argument expression. Any difference in top-level 4672 // cv-qualification is subsumed by the initialization itself 4673 // and does not constitute a conversion. 4674 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4675 /*AllowExplicit=*/false, 4676 /*ForceRValue=*/false, 4677 /*InOverloadResolution=*/false); 4678 4679 // Of course, that's still a reference binding. 4680 if (ICS->isStandard()) { 4681 ICS->Standard.ReferenceBinding = true; 4682 ICS->Standard.RRefBinding = isRValRef; 4683 } else if (ICS->isUserDefined()) { 4684 ICS->UserDefined.After.ReferenceBinding = true; 4685 ICS->UserDefined.After.RRefBinding = isRValRef; 4686 } 4687 return ICS->isBad(); 4688 } else { 4689 ImplicitConversionSequence Conversions; 4690 bool badConversion = PerformImplicitConversion(Init, T1, AA_Initializing, 4691 false, false, 4692 Conversions); 4693 if (badConversion) { 4694 if (Conversions.isAmbiguous()) { 4695 Diag(DeclLoc, 4696 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4697 for (int j = Conversions.Ambiguous.conversions().size()-1; 4698 j >= 0; j--) { 4699 FunctionDecl *Func = Conversions.Ambiguous.conversions()[j]; 4700 NoteOverloadCandidate(Func); 4701 } 4702 } 4703 else { 4704 if (isRValRef) 4705 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4706 << Init->getSourceRange(); 4707 else 4708 Diag(DeclLoc, diag::err_invalid_initialization) 4709 << DeclType << Init->getType() << Init->getSourceRange(); 4710 } 4711 } 4712 return badConversion; 4713 } 4714} 4715 4716static inline bool 4717CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4718 const FunctionDecl *FnDecl) { 4719 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4720 if (isa<NamespaceDecl>(DC)) { 4721 return SemaRef.Diag(FnDecl->getLocation(), 4722 diag::err_operator_new_delete_declared_in_namespace) 4723 << FnDecl->getDeclName(); 4724 } 4725 4726 if (isa<TranslationUnitDecl>(DC) && 4727 FnDecl->getStorageClass() == FunctionDecl::Static) { 4728 return SemaRef.Diag(FnDecl->getLocation(), 4729 diag::err_operator_new_delete_declared_static) 4730 << FnDecl->getDeclName(); 4731 } 4732 4733 return false; 4734} 4735 4736static inline bool 4737CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 4738 CanQualType ExpectedResultType, 4739 CanQualType ExpectedFirstParamType, 4740 unsigned DependentParamTypeDiag, 4741 unsigned InvalidParamTypeDiag) { 4742 QualType ResultType = 4743 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 4744 4745 // Check that the result type is not dependent. 4746 if (ResultType->isDependentType()) 4747 return SemaRef.Diag(FnDecl->getLocation(), 4748 diag::err_operator_new_delete_dependent_result_type) 4749 << FnDecl->getDeclName() << ExpectedResultType; 4750 4751 // Check that the result type is what we expect. 4752 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 4753 return SemaRef.Diag(FnDecl->getLocation(), 4754 diag::err_operator_new_delete_invalid_result_type) 4755 << FnDecl->getDeclName() << ExpectedResultType; 4756 4757 // A function template must have at least 2 parameters. 4758 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 4759 return SemaRef.Diag(FnDecl->getLocation(), 4760 diag::err_operator_new_delete_template_too_few_parameters) 4761 << FnDecl->getDeclName(); 4762 4763 // The function decl must have at least 1 parameter. 4764 if (FnDecl->getNumParams() == 0) 4765 return SemaRef.Diag(FnDecl->getLocation(), 4766 diag::err_operator_new_delete_too_few_parameters) 4767 << FnDecl->getDeclName(); 4768 4769 // Check the the first parameter type is not dependent. 4770 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4771 if (FirstParamType->isDependentType()) 4772 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 4773 << FnDecl->getDeclName() << ExpectedFirstParamType; 4774 4775 // Check that the first parameter type is what we expect. 4776 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 4777 ExpectedFirstParamType) 4778 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 4779 << FnDecl->getDeclName() << ExpectedFirstParamType; 4780 4781 return false; 4782} 4783 4784static bool 4785CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4786 // C++ [basic.stc.dynamic.allocation]p1: 4787 // A program is ill-formed if an allocation function is declared in a 4788 // namespace scope other than global scope or declared static in global 4789 // scope. 4790 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4791 return true; 4792 4793 CanQualType SizeTy = 4794 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 4795 4796 // C++ [basic.stc.dynamic.allocation]p1: 4797 // The return type shall be void*. The first parameter shall have type 4798 // std::size_t. 4799 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 4800 SizeTy, 4801 diag::err_operator_new_dependent_param_type, 4802 diag::err_operator_new_param_type)) 4803 return true; 4804 4805 // C++ [basic.stc.dynamic.allocation]p1: 4806 // The first parameter shall not have an associated default argument. 4807 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 4808 return SemaRef.Diag(FnDecl->getLocation(), 4809 diag::err_operator_new_default_arg) 4810 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 4811 4812 return false; 4813} 4814 4815static bool 4816CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 4817 // C++ [basic.stc.dynamic.deallocation]p1: 4818 // A program is ill-formed if deallocation functions are declared in a 4819 // namespace scope other than global scope or declared static in global 4820 // scope. 4821 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 4822 return true; 4823 4824 // C++ [basic.stc.dynamic.deallocation]p2: 4825 // Each deallocation function shall return void and its first parameter 4826 // shall be void*. 4827 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 4828 SemaRef.Context.VoidPtrTy, 4829 diag::err_operator_delete_dependent_param_type, 4830 diag::err_operator_delete_param_type)) 4831 return true; 4832 4833 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 4834 if (FirstParamType->isDependentType()) 4835 return SemaRef.Diag(FnDecl->getLocation(), 4836 diag::err_operator_delete_dependent_param_type) 4837 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4838 4839 if (SemaRef.Context.getCanonicalType(FirstParamType) != 4840 SemaRef.Context.VoidPtrTy) 4841 return SemaRef.Diag(FnDecl->getLocation(), 4842 diag::err_operator_delete_param_type) 4843 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 4844 4845 return false; 4846} 4847 4848/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4849/// of this overloaded operator is well-formed. If so, returns false; 4850/// otherwise, emits appropriate diagnostics and returns true. 4851bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4852 assert(FnDecl && FnDecl->isOverloadedOperator() && 4853 "Expected an overloaded operator declaration"); 4854 4855 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4856 4857 // C++ [over.oper]p5: 4858 // The allocation and deallocation functions, operator new, 4859 // operator new[], operator delete and operator delete[], are 4860 // described completely in 3.7.3. The attributes and restrictions 4861 // found in the rest of this subclause do not apply to them unless 4862 // explicitly stated in 3.7.3. 4863 if (Op == OO_Delete || Op == OO_Array_Delete) 4864 return CheckOperatorDeleteDeclaration(*this, FnDecl); 4865 4866 if (Op == OO_New || Op == OO_Array_New) 4867 return CheckOperatorNewDeclaration(*this, FnDecl); 4868 4869 // C++ [over.oper]p6: 4870 // An operator function shall either be a non-static member 4871 // function or be a non-member function and have at least one 4872 // parameter whose type is a class, a reference to a class, an 4873 // enumeration, or a reference to an enumeration. 4874 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4875 if (MethodDecl->isStatic()) 4876 return Diag(FnDecl->getLocation(), 4877 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4878 } else { 4879 bool ClassOrEnumParam = false; 4880 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4881 ParamEnd = FnDecl->param_end(); 4882 Param != ParamEnd; ++Param) { 4883 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4884 if (ParamType->isDependentType() || ParamType->isRecordType() || 4885 ParamType->isEnumeralType()) { 4886 ClassOrEnumParam = true; 4887 break; 4888 } 4889 } 4890 4891 if (!ClassOrEnumParam) 4892 return Diag(FnDecl->getLocation(), 4893 diag::err_operator_overload_needs_class_or_enum) 4894 << FnDecl->getDeclName(); 4895 } 4896 4897 // C++ [over.oper]p8: 4898 // An operator function cannot have default arguments (8.3.6), 4899 // except where explicitly stated below. 4900 // 4901 // Only the function-call operator allows default arguments 4902 // (C++ [over.call]p1). 4903 if (Op != OO_Call) { 4904 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4905 Param != FnDecl->param_end(); ++Param) { 4906 if ((*Param)->hasDefaultArg()) 4907 return Diag((*Param)->getLocation(), 4908 diag::err_operator_overload_default_arg) 4909 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 4910 } 4911 } 4912 4913 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4914 { false, false, false } 4915#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4916 , { Unary, Binary, MemberOnly } 4917#include "clang/Basic/OperatorKinds.def" 4918 }; 4919 4920 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4921 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4922 bool MustBeMemberOperator = OperatorUses[Op][2]; 4923 4924 // C++ [over.oper]p8: 4925 // [...] Operator functions cannot have more or fewer parameters 4926 // than the number required for the corresponding operator, as 4927 // described in the rest of this subclause. 4928 unsigned NumParams = FnDecl->getNumParams() 4929 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4930 if (Op != OO_Call && 4931 ((NumParams == 1 && !CanBeUnaryOperator) || 4932 (NumParams == 2 && !CanBeBinaryOperator) || 4933 (NumParams < 1) || (NumParams > 2))) { 4934 // We have the wrong number of parameters. 4935 unsigned ErrorKind; 4936 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4937 ErrorKind = 2; // 2 -> unary or binary. 4938 } else if (CanBeUnaryOperator) { 4939 ErrorKind = 0; // 0 -> unary 4940 } else { 4941 assert(CanBeBinaryOperator && 4942 "All non-call overloaded operators are unary or binary!"); 4943 ErrorKind = 1; // 1 -> binary 4944 } 4945 4946 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4947 << FnDecl->getDeclName() << NumParams << ErrorKind; 4948 } 4949 4950 // Overloaded operators other than operator() cannot be variadic. 4951 if (Op != OO_Call && 4952 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4953 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4954 << FnDecl->getDeclName(); 4955 } 4956 4957 // Some operators must be non-static member functions. 4958 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4959 return Diag(FnDecl->getLocation(), 4960 diag::err_operator_overload_must_be_member) 4961 << FnDecl->getDeclName(); 4962 } 4963 4964 // C++ [over.inc]p1: 4965 // The user-defined function called operator++ implements the 4966 // prefix and postfix ++ operator. If this function is a member 4967 // function with no parameters, or a non-member function with one 4968 // parameter of class or enumeration type, it defines the prefix 4969 // increment operator ++ for objects of that type. If the function 4970 // is a member function with one parameter (which shall be of type 4971 // int) or a non-member function with two parameters (the second 4972 // of which shall be of type int), it defines the postfix 4973 // increment operator ++ for objects of that type. 4974 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4975 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4976 bool ParamIsInt = false; 4977 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4978 ParamIsInt = BT->getKind() == BuiltinType::Int; 4979 4980 if (!ParamIsInt) 4981 return Diag(LastParam->getLocation(), 4982 diag::err_operator_overload_post_incdec_must_be_int) 4983 << LastParam->getType() << (Op == OO_MinusMinus); 4984 } 4985 4986 // Notify the class if it got an assignment operator. 4987 if (Op == OO_Equal) { 4988 // Would have returned earlier otherwise. 4989 assert(isa<CXXMethodDecl>(FnDecl) && 4990 "Overloaded = not member, but not filtered."); 4991 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 4992 Method->getParent()->addedAssignmentOperator(Context, Method); 4993 } 4994 4995 return false; 4996} 4997 4998/// CheckLiteralOperatorDeclaration - Check whether the declaration 4999/// of this literal operator function is well-formed. If so, returns 5000/// false; otherwise, emits appropriate diagnostics and returns true. 5001bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5002 DeclContext *DC = FnDecl->getDeclContext(); 5003 Decl::Kind Kind = DC->getDeclKind(); 5004 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5005 Kind != Decl::LinkageSpec) { 5006 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5007 << FnDecl->getDeclName(); 5008 return true; 5009 } 5010 5011 bool Valid = false; 5012 5013 // FIXME: Check for the one valid template signature 5014 // template <char...> type operator "" name(); 5015 5016 if (FunctionDecl::param_iterator Param = FnDecl->param_begin()) { 5017 // Check the first parameter 5018 QualType T = (*Param)->getType(); 5019 5020 // unsigned long long int and long double are allowed, but only 5021 // alone. 5022 // We also allow any character type; their omission seems to be a bug 5023 // in n3000 5024 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5025 Context.hasSameType(T, Context.LongDoubleTy) || 5026 Context.hasSameType(T, Context.CharTy) || 5027 Context.hasSameType(T, Context.WCharTy) || 5028 Context.hasSameType(T, Context.Char16Ty) || 5029 Context.hasSameType(T, Context.Char32Ty)) { 5030 if (++Param == FnDecl->param_end()) 5031 Valid = true; 5032 goto FinishedParams; 5033 } 5034 5035 // Otherwise it must be a pointer to const; let's strip those. 5036 const PointerType *PT = T->getAs<PointerType>(); 5037 if (!PT) 5038 goto FinishedParams; 5039 T = PT->getPointeeType(); 5040 if (!T.isConstQualified()) 5041 goto FinishedParams; 5042 T = T.getUnqualifiedType(); 5043 5044 // Move on to the second parameter; 5045 ++Param; 5046 5047 // If there is no second parameter, the first must be a const char * 5048 if (Param == FnDecl->param_end()) { 5049 if (Context.hasSameType(T, Context.CharTy)) 5050 Valid = true; 5051 goto FinishedParams; 5052 } 5053 5054 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5055 // are allowed as the first parameter to a two-parameter function 5056 if (!(Context.hasSameType(T, Context.CharTy) || 5057 Context.hasSameType(T, Context.WCharTy) || 5058 Context.hasSameType(T, Context.Char16Ty) || 5059 Context.hasSameType(T, Context.Char32Ty))) 5060 goto FinishedParams; 5061 5062 // The second and final parameter must be an std::size_t 5063 T = (*Param)->getType().getUnqualifiedType(); 5064 if (Context.hasSameType(T, Context.getSizeType()) && 5065 ++Param == FnDecl->param_end()) 5066 Valid = true; 5067 } 5068 5069 // FIXME: This diagnostic is absolutely terrible. 5070FinishedParams: 5071 if (!Valid) { 5072 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5073 << FnDecl->getDeclName(); 5074 return true; 5075 } 5076 5077 return false; 5078} 5079 5080/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5081/// linkage specification, including the language and (if present) 5082/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5083/// the location of the language string literal, which is provided 5084/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5085/// the '{' brace. Otherwise, this linkage specification does not 5086/// have any braces. 5087Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5088 SourceLocation ExternLoc, 5089 SourceLocation LangLoc, 5090 const char *Lang, 5091 unsigned StrSize, 5092 SourceLocation LBraceLoc) { 5093 LinkageSpecDecl::LanguageIDs Language; 5094 if (strncmp(Lang, "\"C\"", StrSize) == 0) 5095 Language = LinkageSpecDecl::lang_c; 5096 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 5097 Language = LinkageSpecDecl::lang_cxx; 5098 else { 5099 Diag(LangLoc, diag::err_bad_language); 5100 return DeclPtrTy(); 5101 } 5102 5103 // FIXME: Add all the various semantics of linkage specifications 5104 5105 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5106 LangLoc, Language, 5107 LBraceLoc.isValid()); 5108 CurContext->addDecl(D); 5109 PushDeclContext(S, D); 5110 return DeclPtrTy::make(D); 5111} 5112 5113/// ActOnFinishLinkageSpecification - Completely the definition of 5114/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5115/// valid, it's the position of the closing '}' brace in a linkage 5116/// specification that uses braces. 5117Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5118 DeclPtrTy LinkageSpec, 5119 SourceLocation RBraceLoc) { 5120 if (LinkageSpec) 5121 PopDeclContext(); 5122 return LinkageSpec; 5123} 5124 5125/// \brief Perform semantic analysis for the variable declaration that 5126/// occurs within a C++ catch clause, returning the newly-created 5127/// variable. 5128VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5129 TypeSourceInfo *TInfo, 5130 IdentifierInfo *Name, 5131 SourceLocation Loc, 5132 SourceRange Range) { 5133 bool Invalid = false; 5134 5135 // Arrays and functions decay. 5136 if (ExDeclType->isArrayType()) 5137 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5138 else if (ExDeclType->isFunctionType()) 5139 ExDeclType = Context.getPointerType(ExDeclType); 5140 5141 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5142 // The exception-declaration shall not denote a pointer or reference to an 5143 // incomplete type, other than [cv] void*. 5144 // N2844 forbids rvalue references. 5145 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5146 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5147 Invalid = true; 5148 } 5149 5150 QualType BaseType = ExDeclType; 5151 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5152 unsigned DK = diag::err_catch_incomplete; 5153 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5154 BaseType = Ptr->getPointeeType(); 5155 Mode = 1; 5156 DK = diag::err_catch_incomplete_ptr; 5157 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5158 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5159 BaseType = Ref->getPointeeType(); 5160 Mode = 2; 5161 DK = diag::err_catch_incomplete_ref; 5162 } 5163 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5164 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 5165 Invalid = true; 5166 5167 if (!Invalid && !ExDeclType->isDependentType() && 5168 RequireNonAbstractType(Loc, ExDeclType, 5169 diag::err_abstract_type_in_decl, 5170 AbstractVariableType)) 5171 Invalid = true; 5172 5173 // FIXME: Need to test for ability to copy-construct and destroy the 5174 // exception variable. 5175 5176 // FIXME: Need to check for abstract classes. 5177 5178 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5179 Name, ExDeclType, TInfo, VarDecl::None); 5180 5181 if (Invalid) 5182 ExDecl->setInvalidDecl(); 5183 5184 return ExDecl; 5185} 5186 5187/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5188/// handler. 5189Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5190 TypeSourceInfo *TInfo = 0; 5191 QualType ExDeclType = GetTypeForDeclarator(D, S, &TInfo); 5192 5193 bool Invalid = D.isInvalidType(); 5194 IdentifierInfo *II = D.getIdentifier(); 5195 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 5196 // The scope should be freshly made just for us. There is just no way 5197 // it contains any previous declaration. 5198 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5199 if (PrevDecl->isTemplateParameter()) { 5200 // Maybe we will complain about the shadowed template parameter. 5201 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5202 } 5203 } 5204 5205 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5206 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5207 << D.getCXXScopeSpec().getRange(); 5208 Invalid = true; 5209 } 5210 5211 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5212 D.getIdentifier(), 5213 D.getIdentifierLoc(), 5214 D.getDeclSpec().getSourceRange()); 5215 5216 if (Invalid) 5217 ExDecl->setInvalidDecl(); 5218 5219 // Add the exception declaration into this scope. 5220 if (II) 5221 PushOnScopeChains(ExDecl, S); 5222 else 5223 CurContext->addDecl(ExDecl); 5224 5225 ProcessDeclAttributes(S, ExDecl, D); 5226 return DeclPtrTy::make(ExDecl); 5227} 5228 5229Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5230 ExprArg assertexpr, 5231 ExprArg assertmessageexpr) { 5232 Expr *AssertExpr = (Expr *)assertexpr.get(); 5233 StringLiteral *AssertMessage = 5234 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5235 5236 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5237 llvm::APSInt Value(32); 5238 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5239 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5240 AssertExpr->getSourceRange(); 5241 return DeclPtrTy(); 5242 } 5243 5244 if (Value == 0) { 5245 Diag(AssertLoc, diag::err_static_assert_failed) 5246 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5247 } 5248 } 5249 5250 assertexpr.release(); 5251 assertmessageexpr.release(); 5252 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5253 AssertExpr, AssertMessage); 5254 5255 CurContext->addDecl(Decl); 5256 return DeclPtrTy::make(Decl); 5257} 5258 5259/// Handle a friend type declaration. This works in tandem with 5260/// ActOnTag. 5261/// 5262/// Notes on friend class templates: 5263/// 5264/// We generally treat friend class declarations as if they were 5265/// declaring a class. So, for example, the elaborated type specifier 5266/// in a friend declaration is required to obey the restrictions of a 5267/// class-head (i.e. no typedefs in the scope chain), template 5268/// parameters are required to match up with simple template-ids, &c. 5269/// However, unlike when declaring a template specialization, it's 5270/// okay to refer to a template specialization without an empty 5271/// template parameter declaration, e.g. 5272/// friend class A<T>::B<unsigned>; 5273/// We permit this as a special case; if there are any template 5274/// parameters present at all, require proper matching, i.e. 5275/// template <> template <class T> friend class A<int>::B; 5276Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5277 MultiTemplateParamsArg TempParams) { 5278 SourceLocation Loc = DS.getSourceRange().getBegin(); 5279 5280 assert(DS.isFriendSpecified()); 5281 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5282 5283 // Try to convert the decl specifier to a type. This works for 5284 // friend templates because ActOnTag never produces a ClassTemplateDecl 5285 // for a TUK_Friend. 5286 Declarator TheDeclarator(DS, Declarator::MemberContext); 5287 QualType T = GetTypeForDeclarator(TheDeclarator, S); 5288 if (TheDeclarator.isInvalidType()) 5289 return DeclPtrTy(); 5290 5291 // This is definitely an error in C++98. It's probably meant to 5292 // be forbidden in C++0x, too, but the specification is just 5293 // poorly written. 5294 // 5295 // The problem is with declarations like the following: 5296 // template <T> friend A<T>::foo; 5297 // where deciding whether a class C is a friend or not now hinges 5298 // on whether there exists an instantiation of A that causes 5299 // 'foo' to equal C. There are restrictions on class-heads 5300 // (which we declare (by fiat) elaborated friend declarations to 5301 // be) that makes this tractable. 5302 // 5303 // FIXME: handle "template <> friend class A<T>;", which 5304 // is possibly well-formed? Who even knows? 5305 if (TempParams.size() && !isa<ElaboratedType>(T)) { 5306 Diag(Loc, diag::err_tagless_friend_type_template) 5307 << DS.getSourceRange(); 5308 return DeclPtrTy(); 5309 } 5310 5311 // C++ [class.friend]p2: 5312 // An elaborated-type-specifier shall be used in a friend declaration 5313 // for a class.* 5314 // * The class-key of the elaborated-type-specifier is required. 5315 // This is one of the rare places in Clang where it's legitimate to 5316 // ask about the "spelling" of the type. 5317 if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) { 5318 // If we evaluated the type to a record type, suggest putting 5319 // a tag in front. 5320 if (const RecordType *RT = T->getAs<RecordType>()) { 5321 RecordDecl *RD = RT->getDecl(); 5322 5323 std::string InsertionText = std::string(" ") + RD->getKindName(); 5324 5325 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 5326 << (unsigned) RD->getTagKind() 5327 << T 5328 << SourceRange(DS.getFriendSpecLoc()) 5329 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 5330 InsertionText); 5331 return DeclPtrTy(); 5332 }else { 5333 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 5334 << DS.getSourceRange(); 5335 return DeclPtrTy(); 5336 } 5337 } 5338 5339 // Enum types cannot be friends. 5340 if (T->getAs<EnumType>()) { 5341 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 5342 << SourceRange(DS.getFriendSpecLoc()); 5343 return DeclPtrTy(); 5344 } 5345 5346 // C++98 [class.friend]p1: A friend of a class is a function 5347 // or class that is not a member of the class . . . 5348 // This is fixed in DR77, which just barely didn't make the C++03 5349 // deadline. It's also a very silly restriction that seriously 5350 // affects inner classes and which nobody else seems to implement; 5351 // thus we never diagnose it, not even in -pedantic. 5352 5353 Decl *D; 5354 if (TempParams.size()) 5355 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5356 TempParams.size(), 5357 (TemplateParameterList**) TempParams.release(), 5358 T.getTypePtr(), 5359 DS.getFriendSpecLoc()); 5360 else 5361 D = FriendDecl::Create(Context, CurContext, Loc, T.getTypePtr(), 5362 DS.getFriendSpecLoc()); 5363 D->setAccess(AS_public); 5364 CurContext->addDecl(D); 5365 5366 return DeclPtrTy::make(D); 5367} 5368 5369Sema::DeclPtrTy 5370Sema::ActOnFriendFunctionDecl(Scope *S, 5371 Declarator &D, 5372 bool IsDefinition, 5373 MultiTemplateParamsArg TemplateParams) { 5374 const DeclSpec &DS = D.getDeclSpec(); 5375 5376 assert(DS.isFriendSpecified()); 5377 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5378 5379 SourceLocation Loc = D.getIdentifierLoc(); 5380 TypeSourceInfo *TInfo = 0; 5381 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5382 5383 // C++ [class.friend]p1 5384 // A friend of a class is a function or class.... 5385 // Note that this sees through typedefs, which is intended. 5386 // It *doesn't* see through dependent types, which is correct 5387 // according to [temp.arg.type]p3: 5388 // If a declaration acquires a function type through a 5389 // type dependent on a template-parameter and this causes 5390 // a declaration that does not use the syntactic form of a 5391 // function declarator to have a function type, the program 5392 // is ill-formed. 5393 if (!T->isFunctionType()) { 5394 Diag(Loc, diag::err_unexpected_friend); 5395 5396 // It might be worthwhile to try to recover by creating an 5397 // appropriate declaration. 5398 return DeclPtrTy(); 5399 } 5400 5401 // C++ [namespace.memdef]p3 5402 // - If a friend declaration in a non-local class first declares a 5403 // class or function, the friend class or function is a member 5404 // of the innermost enclosing namespace. 5405 // - The name of the friend is not found by simple name lookup 5406 // until a matching declaration is provided in that namespace 5407 // scope (either before or after the class declaration granting 5408 // friendship). 5409 // - If a friend function is called, its name may be found by the 5410 // name lookup that considers functions from namespaces and 5411 // classes associated with the types of the function arguments. 5412 // - When looking for a prior declaration of a class or a function 5413 // declared as a friend, scopes outside the innermost enclosing 5414 // namespace scope are not considered. 5415 5416 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5417 DeclarationName Name = GetNameForDeclarator(D); 5418 assert(Name); 5419 5420 // The context we found the declaration in, or in which we should 5421 // create the declaration. 5422 DeclContext *DC; 5423 5424 // FIXME: handle local classes 5425 5426 // Recover from invalid scope qualifiers as if they just weren't there. 5427 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5428 ForRedeclaration); 5429 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5430 // FIXME: RequireCompleteDeclContext 5431 DC = computeDeclContext(ScopeQual); 5432 5433 // FIXME: handle dependent contexts 5434 if (!DC) return DeclPtrTy(); 5435 5436 LookupQualifiedName(Previous, DC); 5437 5438 // If searching in that context implicitly found a declaration in 5439 // a different context, treat it like it wasn't found at all. 5440 // TODO: better diagnostics for this case. Suggesting the right 5441 // qualified scope would be nice... 5442 // FIXME: getRepresentativeDecl() is not right here at all 5443 if (Previous.empty() || 5444 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 5445 D.setInvalidType(); 5446 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5447 return DeclPtrTy(); 5448 } 5449 5450 // C++ [class.friend]p1: A friend of a class is a function or 5451 // class that is not a member of the class . . . 5452 if (DC->Equals(CurContext)) 5453 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5454 5455 // Otherwise walk out to the nearest namespace scope looking for matches. 5456 } else { 5457 // TODO: handle local class contexts. 5458 5459 DC = CurContext; 5460 while (true) { 5461 // Skip class contexts. If someone can cite chapter and verse 5462 // for this behavior, that would be nice --- it's what GCC and 5463 // EDG do, and it seems like a reasonable intent, but the spec 5464 // really only says that checks for unqualified existing 5465 // declarations should stop at the nearest enclosing namespace, 5466 // not that they should only consider the nearest enclosing 5467 // namespace. 5468 while (DC->isRecord()) 5469 DC = DC->getParent(); 5470 5471 LookupQualifiedName(Previous, DC); 5472 5473 // TODO: decide what we think about using declarations. 5474 if (!Previous.empty()) 5475 break; 5476 5477 if (DC->isFileContext()) break; 5478 DC = DC->getParent(); 5479 } 5480 5481 // C++ [class.friend]p1: A friend of a class is a function or 5482 // class that is not a member of the class . . . 5483 // C++0x changes this for both friend types and functions. 5484 // Most C++ 98 compilers do seem to give an error here, so 5485 // we do, too. 5486 if (!Previous.empty() && DC->Equals(CurContext) 5487 && !getLangOptions().CPlusPlus0x) 5488 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5489 } 5490 5491 if (DC->isFileContext()) { 5492 // This implies that it has to be an operator or function. 5493 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5494 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5495 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5496 Diag(Loc, diag::err_introducing_special_friend) << 5497 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5498 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5499 return DeclPtrTy(); 5500 } 5501 } 5502 5503 bool Redeclaration = false; 5504 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5505 move(TemplateParams), 5506 IsDefinition, 5507 Redeclaration); 5508 if (!ND) return DeclPtrTy(); 5509 5510 assert(ND->getDeclContext() == DC); 5511 assert(ND->getLexicalDeclContext() == CurContext); 5512 5513 // Add the function declaration to the appropriate lookup tables, 5514 // adjusting the redeclarations list as necessary. We don't 5515 // want to do this yet if the friending class is dependent. 5516 // 5517 // Also update the scope-based lookup if the target context's 5518 // lookup context is in lexical scope. 5519 if (!CurContext->isDependentContext()) { 5520 DC = DC->getLookupContext(); 5521 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5522 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5523 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5524 } 5525 5526 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5527 D.getIdentifierLoc(), ND, 5528 DS.getFriendSpecLoc()); 5529 FrD->setAccess(AS_public); 5530 CurContext->addDecl(FrD); 5531 5532 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) 5533 FrD->setSpecialization(true); 5534 5535 return DeclPtrTy::make(ND); 5536} 5537 5538void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5539 AdjustDeclIfTemplate(dcl); 5540 5541 Decl *Dcl = dcl.getAs<Decl>(); 5542 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5543 if (!Fn) { 5544 Diag(DelLoc, diag::err_deleted_non_function); 5545 return; 5546 } 5547 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5548 Diag(DelLoc, diag::err_deleted_decl_not_first); 5549 Diag(Prev->getLocation(), diag::note_previous_declaration); 5550 // If the declaration wasn't the first, we delete the function anyway for 5551 // recovery. 5552 } 5553 Fn->setDeleted(); 5554} 5555 5556static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5557 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5558 ++CI) { 5559 Stmt *SubStmt = *CI; 5560 if (!SubStmt) 5561 continue; 5562 if (isa<ReturnStmt>(SubStmt)) 5563 Self.Diag(SubStmt->getSourceRange().getBegin(), 5564 diag::err_return_in_constructor_handler); 5565 if (!isa<Expr>(SubStmt)) 5566 SearchForReturnInStmt(Self, SubStmt); 5567 } 5568} 5569 5570void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5571 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5572 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5573 SearchForReturnInStmt(*this, Handler); 5574 } 5575} 5576 5577bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5578 const CXXMethodDecl *Old) { 5579 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5580 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5581 5582 if (Context.hasSameType(NewTy, OldTy)) 5583 return false; 5584 5585 // Check if the return types are covariant 5586 QualType NewClassTy, OldClassTy; 5587 5588 /// Both types must be pointers or references to classes. 5589 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5590 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5591 NewClassTy = NewPT->getPointeeType(); 5592 OldClassTy = OldPT->getPointeeType(); 5593 } 5594 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5595 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5596 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5597 NewClassTy = NewRT->getPointeeType(); 5598 OldClassTy = OldRT->getPointeeType(); 5599 } 5600 } 5601 } 5602 5603 // The return types aren't either both pointers or references to a class type. 5604 if (NewClassTy.isNull()) { 5605 Diag(New->getLocation(), 5606 diag::err_different_return_type_for_overriding_virtual_function) 5607 << New->getDeclName() << NewTy << OldTy; 5608 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5609 5610 return true; 5611 } 5612 5613 // C++ [class.virtual]p6: 5614 // If the return type of D::f differs from the return type of B::f, the 5615 // class type in the return type of D::f shall be complete at the point of 5616 // declaration of D::f or shall be the class type D. 5617 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5618 if (!RT->isBeingDefined() && 5619 RequireCompleteType(New->getLocation(), NewClassTy, 5620 PDiag(diag::err_covariant_return_incomplete) 5621 << New->getDeclName())) 5622 return true; 5623 } 5624 5625 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5626 // Check if the new class derives from the old class. 5627 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5628 Diag(New->getLocation(), 5629 diag::err_covariant_return_not_derived) 5630 << New->getDeclName() << NewTy << OldTy; 5631 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5632 return true; 5633 } 5634 5635 // Check if we the conversion from derived to base is valid. 5636 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, ADK_covariance, 5637 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5638 // FIXME: Should this point to the return type? 5639 New->getLocation(), SourceRange(), New->getDeclName())) { 5640 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5641 return true; 5642 } 5643 } 5644 5645 // The qualifiers of the return types must be the same. 5646 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 5647 Diag(New->getLocation(), 5648 diag::err_covariant_return_type_different_qualifications) 5649 << New->getDeclName() << NewTy << OldTy; 5650 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5651 return true; 5652 }; 5653 5654 5655 // The new class type must have the same or less qualifiers as the old type. 5656 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 5657 Diag(New->getLocation(), 5658 diag::err_covariant_return_type_class_type_more_qualified) 5659 << New->getDeclName() << NewTy << OldTy; 5660 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5661 return true; 5662 }; 5663 5664 return false; 5665} 5666 5667bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 5668 const CXXMethodDecl *Old) 5669{ 5670 if (Old->hasAttr<FinalAttr>()) { 5671 Diag(New->getLocation(), diag::err_final_function_overridden) 5672 << New->getDeclName(); 5673 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5674 return true; 5675 } 5676 5677 return false; 5678} 5679 5680/// \brief Mark the given method pure. 5681/// 5682/// \param Method the method to be marked pure. 5683/// 5684/// \param InitRange the source range that covers the "0" initializer. 5685bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 5686 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 5687 Method->setPure(); 5688 5689 // A class is abstract if at least one function is pure virtual. 5690 Method->getParent()->setAbstract(true); 5691 return false; 5692 } 5693 5694 if (!Method->isInvalidDecl()) 5695 Diag(Method->getLocation(), diag::err_non_virtual_pure) 5696 << Method->getDeclName() << InitRange; 5697 return true; 5698} 5699 5700/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 5701/// an initializer for the out-of-line declaration 'Dcl'. The scope 5702/// is a fresh scope pushed for just this purpose. 5703/// 5704/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 5705/// static data member of class X, names should be looked up in the scope of 5706/// class X. 5707void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5708 // If there is no declaration, there was an error parsing it. 5709 Decl *D = Dcl.getAs<Decl>(); 5710 if (D == 0) return; 5711 5712 // We should only get called for declarations with scope specifiers, like: 5713 // int foo::bar; 5714 assert(D->isOutOfLine()); 5715 EnterDeclaratorContext(S, D->getDeclContext()); 5716} 5717 5718/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 5719/// initializer for the out-of-line declaration 'Dcl'. 5720void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 5721 // If there is no declaration, there was an error parsing it. 5722 Decl *D = Dcl.getAs<Decl>(); 5723 if (D == 0) return; 5724 5725 assert(D->isOutOfLine()); 5726 ExitDeclaratorContext(S); 5727} 5728 5729/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 5730/// C++ if/switch/while/for statement. 5731/// e.g: "if (int x = f()) {...}" 5732Action::DeclResult 5733Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 5734 // C++ 6.4p2: 5735 // The declarator shall not specify a function or an array. 5736 // The type-specifier-seq shall not contain typedef and shall not declare a 5737 // new class or enumeration. 5738 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 5739 "Parser allowed 'typedef' as storage class of condition decl."); 5740 5741 TypeSourceInfo *TInfo = 0; 5742 TagDecl *OwnedTag = 0; 5743 QualType Ty = GetTypeForDeclarator(D, S, &TInfo, &OwnedTag); 5744 5745 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 5746 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 5747 // would be created and CXXConditionDeclExpr wants a VarDecl. 5748 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 5749 << D.getSourceRange(); 5750 return DeclResult(); 5751 } else if (OwnedTag && OwnedTag->isDefinition()) { 5752 // The type-specifier-seq shall not declare a new class or enumeration. 5753 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 5754 } 5755 5756 DeclPtrTy Dcl = ActOnDeclarator(S, D); 5757 if (!Dcl) 5758 return DeclResult(); 5759 5760 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 5761 VD->setDeclaredInCondition(true); 5762 return Dcl; 5763} 5764 5765void Sema::MaybeMarkVirtualMembersReferenced(SourceLocation Loc, 5766 CXXMethodDecl *MD) { 5767 // Ignore dependent types. 5768 if (MD->isDependentContext()) 5769 return; 5770 5771 CXXRecordDecl *RD = MD->getParent(); 5772 5773 // Ignore classes without a vtable. 5774 if (!RD->isDynamicClass()) 5775 return; 5776 5777 // Ignore declarations that are not definitions. 5778 if (!MD->isThisDeclarationADefinition()) 5779 return; 5780 5781 if (isa<CXXConstructorDecl>(MD)) { 5782 switch (MD->getParent()->getTemplateSpecializationKind()) { 5783 case TSK_Undeclared: 5784 case TSK_ExplicitSpecialization: 5785 // Classes that aren't instantiations of templates don't need their 5786 // virtual methods marked until we see the definition of the key 5787 // function. 5788 return; 5789 5790 case TSK_ImplicitInstantiation: 5791 case TSK_ExplicitInstantiationDeclaration: 5792 case TSK_ExplicitInstantiationDefinition: 5793 // This is a constructor of a class template; mark all of the virtual 5794 // members as referenced to ensure that they get instantiatied. 5795 break; 5796 } 5797 } else if (!MD->isOutOfLine()) { 5798 // Consider only out-of-line definitions of member functions. When we see 5799 // an inline definition, it's too early to compute the key function. 5800 return; 5801 } else if (const CXXMethodDecl *KeyFunction = Context.getKeyFunction(RD)) { 5802 // If this is not the key function, we don't need to mark virtual members. 5803 if (KeyFunction->getCanonicalDecl() != MD->getCanonicalDecl()) 5804 return; 5805 } else { 5806 // The class has no key function, so we've already noted that we need to 5807 // mark the virtual members of this class. 5808 return; 5809 } 5810 5811 // We will need to mark all of the virtual members as referenced to build the 5812 // vtable. 5813 ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(RD, Loc)); 5814} 5815 5816bool Sema::ProcessPendingClassesWithUnmarkedVirtualMembers() { 5817 if (ClassesWithUnmarkedVirtualMembers.empty()) 5818 return false; 5819 5820 while (!ClassesWithUnmarkedVirtualMembers.empty()) { 5821 CXXRecordDecl *RD = ClassesWithUnmarkedVirtualMembers.back().first; 5822 SourceLocation Loc = ClassesWithUnmarkedVirtualMembers.back().second; 5823 ClassesWithUnmarkedVirtualMembers.pop_back(); 5824 MarkVirtualMembersReferenced(Loc, RD); 5825 } 5826 5827 return true; 5828} 5829 5830void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, CXXRecordDecl *RD) { 5831 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 5832 e = RD->method_end(); i != e; ++i) { 5833 CXXMethodDecl *MD = *i; 5834 5835 // C++ [basic.def.odr]p2: 5836 // [...] A virtual member function is used if it is not pure. [...] 5837 if (MD->isVirtual() && !MD->isPure()) 5838 MarkDeclarationReferenced(Loc, MD); 5839 } 5840} 5841 5842