SemaDeclCXX.cpp revision 0d30a87e124bb0273fedce3b62401039073fdece
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/CharUnits.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/RecordLayout.h" 23#include "clang/AST/StmtVisitor.h" 24#include "clang/AST/TypeLoc.h" 25#include "clang/AST/TypeOrdering.h" 26#include "clang/Parse/DeclSpec.h" 27#include "clang/Parse/Template.h" 28#include "clang/Basic/PartialDiagnostic.h" 29#include "clang/Lex/Preprocessor.h" 30#include "llvm/ADT/STLExtras.h" 31#include <map> 32#include <set> 33 34using namespace clang; 35 36//===----------------------------------------------------------------------===// 37// CheckDefaultArgumentVisitor 38//===----------------------------------------------------------------------===// 39 40namespace { 41 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 42 /// the default argument of a parameter to determine whether it 43 /// contains any ill-formed subexpressions. For example, this will 44 /// diagnose the use of local variables or parameters within the 45 /// default argument expression. 46 class CheckDefaultArgumentVisitor 47 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 48 Expr *DefaultArg; 49 Sema *S; 50 51 public: 52 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 53 : DefaultArg(defarg), S(s) {} 54 55 bool VisitExpr(Expr *Node); 56 bool VisitDeclRefExpr(DeclRefExpr *DRE); 57 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 58 }; 59 60 /// VisitExpr - Visit all of the children of this expression. 61 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 62 bool IsInvalid = false; 63 for (Stmt::child_iterator I = Node->child_begin(), 64 E = Node->child_end(); I != E; ++I) 65 IsInvalid |= Visit(*I); 66 return IsInvalid; 67 } 68 69 /// VisitDeclRefExpr - Visit a reference to a declaration, to 70 /// determine whether this declaration can be used in the default 71 /// argument expression. 72 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 73 NamedDecl *Decl = DRE->getDecl(); 74 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 75 // C++ [dcl.fct.default]p9 76 // Default arguments are evaluated each time the function is 77 // called. The order of evaluation of function arguments is 78 // unspecified. Consequently, parameters of a function shall not 79 // be used in default argument expressions, even if they are not 80 // evaluated. Parameters of a function declared before a default 81 // argument expression are in scope and can hide namespace and 82 // class member names. 83 return S->Diag(DRE->getSourceRange().getBegin(), 84 diag::err_param_default_argument_references_param) 85 << Param->getDeclName() << DefaultArg->getSourceRange(); 86 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 87 // C++ [dcl.fct.default]p7 88 // Local variables shall not be used in default argument 89 // expressions. 90 if (VDecl->isBlockVarDecl()) 91 return S->Diag(DRE->getSourceRange().getBegin(), 92 diag::err_param_default_argument_references_local) 93 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 94 } 95 96 return false; 97 } 98 99 /// VisitCXXThisExpr - Visit a C++ "this" expression. 100 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 101 // C++ [dcl.fct.default]p8: 102 // The keyword this shall not be used in a default argument of a 103 // member function. 104 return S->Diag(ThisE->getSourceRange().getBegin(), 105 diag::err_param_default_argument_references_this) 106 << ThisE->getSourceRange(); 107 } 108} 109 110bool 111Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 112 SourceLocation EqualLoc) { 113 if (RequireCompleteType(Param->getLocation(), Param->getType(), 114 diag::err_typecheck_decl_incomplete_type)) { 115 Param->setInvalidDecl(); 116 return true; 117 } 118 119 Expr *Arg = (Expr *)DefaultArg.get(); 120 121 // C++ [dcl.fct.default]p5 122 // A default argument expression is implicitly converted (clause 123 // 4) to the parameter type. The default argument expression has 124 // the same semantic constraints as the initializer expression in 125 // a declaration of a variable of the parameter type, using the 126 // copy-initialization semantics (8.5). 127 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 128 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 129 EqualLoc); 130 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 131 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 132 MultiExprArg(*this, (void**)&Arg, 1)); 133 if (Result.isInvalid()) 134 return true; 135 Arg = Result.takeAs<Expr>(); 136 137 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 138 139 // Okay: add the default argument to the parameter 140 Param->setDefaultArg(Arg); 141 142 DefaultArg.release(); 143 144 return false; 145} 146 147/// ActOnParamDefaultArgument - Check whether the default argument 148/// provided for a function parameter is well-formed. If so, attach it 149/// to the parameter declaration. 150void 151Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 152 ExprArg defarg) { 153 if (!param || !defarg.get()) 154 return; 155 156 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 157 UnparsedDefaultArgLocs.erase(Param); 158 159 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 160 161 // Default arguments are only permitted in C++ 162 if (!getLangOptions().CPlusPlus) { 163 Diag(EqualLoc, diag::err_param_default_argument) 164 << DefaultArg->getSourceRange(); 165 Param->setInvalidDecl(); 166 return; 167 } 168 169 // Check that the default argument is well-formed 170 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 171 if (DefaultArgChecker.Visit(DefaultArg.get())) { 172 Param->setInvalidDecl(); 173 return; 174 } 175 176 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 177} 178 179/// ActOnParamUnparsedDefaultArgument - We've seen a default 180/// argument for a function parameter, but we can't parse it yet 181/// because we're inside a class definition. Note that this default 182/// argument will be parsed later. 183void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 184 SourceLocation EqualLoc, 185 SourceLocation ArgLoc) { 186 if (!param) 187 return; 188 189 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 190 if (Param) 191 Param->setUnparsedDefaultArg(); 192 193 UnparsedDefaultArgLocs[Param] = ArgLoc; 194} 195 196/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 197/// the default argument for the parameter param failed. 198void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 199 if (!param) 200 return; 201 202 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 203 204 Param->setInvalidDecl(); 205 206 UnparsedDefaultArgLocs.erase(Param); 207} 208 209/// CheckExtraCXXDefaultArguments - Check for any extra default 210/// arguments in the declarator, which is not a function declaration 211/// or definition and therefore is not permitted to have default 212/// arguments. This routine should be invoked for every declarator 213/// that is not a function declaration or definition. 214void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 215 // C++ [dcl.fct.default]p3 216 // A default argument expression shall be specified only in the 217 // parameter-declaration-clause of a function declaration or in a 218 // template-parameter (14.1). It shall not be specified for a 219 // parameter pack. If it is specified in a 220 // parameter-declaration-clause, it shall not occur within a 221 // declarator or abstract-declarator of a parameter-declaration. 222 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 223 DeclaratorChunk &chunk = D.getTypeObject(i); 224 if (chunk.Kind == DeclaratorChunk::Function) { 225 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 226 ParmVarDecl *Param = 227 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 228 if (Param->hasUnparsedDefaultArg()) { 229 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 230 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 231 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 232 delete Toks; 233 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 234 } else if (Param->getDefaultArg()) { 235 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 236 << Param->getDefaultArg()->getSourceRange(); 237 Param->setDefaultArg(0); 238 } 239 } 240 } 241 } 242} 243 244// MergeCXXFunctionDecl - Merge two declarations of the same C++ 245// function, once we already know that they have the same 246// type. Subroutine of MergeFunctionDecl. Returns true if there was an 247// error, false otherwise. 248bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 249 bool Invalid = false; 250 251 // C++ [dcl.fct.default]p4: 252 // For non-template functions, default arguments can be added in 253 // later declarations of a function in the same 254 // scope. Declarations in different scopes have completely 255 // distinct sets of default arguments. That is, declarations in 256 // inner scopes do not acquire default arguments from 257 // declarations in outer scopes, and vice versa. In a given 258 // function declaration, all parameters subsequent to a 259 // parameter with a default argument shall have default 260 // arguments supplied in this or previous declarations. A 261 // default argument shall not be redefined by a later 262 // declaration (not even to the same value). 263 // 264 // C++ [dcl.fct.default]p6: 265 // Except for member functions of class templates, the default arguments 266 // in a member function definition that appears outside of the class 267 // definition are added to the set of default arguments provided by the 268 // member function declaration in the class definition. 269 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 270 ParmVarDecl *OldParam = Old->getParamDecl(p); 271 ParmVarDecl *NewParam = New->getParamDecl(p); 272 273 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 274 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 275 // hint here. Alternatively, we could walk the type-source information 276 // for NewParam to find the last source location in the type... but it 277 // isn't worth the effort right now. This is the kind of test case that 278 // is hard to get right: 279 280 // int f(int); 281 // void g(int (*fp)(int) = f); 282 // void g(int (*fp)(int) = &f); 283 Diag(NewParam->getLocation(), 284 diag::err_param_default_argument_redefinition) 285 << NewParam->getDefaultArgRange(); 286 287 // Look for the function declaration where the default argument was 288 // actually written, which may be a declaration prior to Old. 289 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 290 Older; Older = Older->getPreviousDeclaration()) { 291 if (!Older->getParamDecl(p)->hasDefaultArg()) 292 break; 293 294 OldParam = Older->getParamDecl(p); 295 } 296 297 Diag(OldParam->getLocation(), diag::note_previous_definition) 298 << OldParam->getDefaultArgRange(); 299 Invalid = true; 300 } else if (OldParam->hasDefaultArg()) { 301 // Merge the old default argument into the new parameter. 302 // It's important to use getInit() here; getDefaultArg() 303 // strips off any top-level CXXExprWithTemporaries. 304 NewParam->setHasInheritedDefaultArg(); 305 if (OldParam->hasUninstantiatedDefaultArg()) 306 NewParam->setUninstantiatedDefaultArg( 307 OldParam->getUninstantiatedDefaultArg()); 308 else 309 NewParam->setDefaultArg(OldParam->getInit()); 310 } else if (NewParam->hasDefaultArg()) { 311 if (New->getDescribedFunctionTemplate()) { 312 // Paragraph 4, quoted above, only applies to non-template functions. 313 Diag(NewParam->getLocation(), 314 diag::err_param_default_argument_template_redecl) 315 << NewParam->getDefaultArgRange(); 316 Diag(Old->getLocation(), diag::note_template_prev_declaration) 317 << false; 318 } else if (New->getTemplateSpecializationKind() 319 != TSK_ImplicitInstantiation && 320 New->getTemplateSpecializationKind() != TSK_Undeclared) { 321 // C++ [temp.expr.spec]p21: 322 // Default function arguments shall not be specified in a declaration 323 // or a definition for one of the following explicit specializations: 324 // - the explicit specialization of a function template; 325 // - the explicit specialization of a member function template; 326 // - the explicit specialization of a member function of a class 327 // template where the class template specialization to which the 328 // member function specialization belongs is implicitly 329 // instantiated. 330 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 331 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 332 << New->getDeclName() 333 << NewParam->getDefaultArgRange(); 334 } else if (New->getDeclContext()->isDependentContext()) { 335 // C++ [dcl.fct.default]p6 (DR217): 336 // Default arguments for a member function of a class template shall 337 // be specified on the initial declaration of the member function 338 // within the class template. 339 // 340 // Reading the tea leaves a bit in DR217 and its reference to DR205 341 // leads me to the conclusion that one cannot add default function 342 // arguments for an out-of-line definition of a member function of a 343 // dependent type. 344 int WhichKind = 2; 345 if (CXXRecordDecl *Record 346 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 347 if (Record->getDescribedClassTemplate()) 348 WhichKind = 0; 349 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 350 WhichKind = 1; 351 else 352 WhichKind = 2; 353 } 354 355 Diag(NewParam->getLocation(), 356 diag::err_param_default_argument_member_template_redecl) 357 << WhichKind 358 << NewParam->getDefaultArgRange(); 359 } 360 } 361 } 362 363 if (CheckEquivalentExceptionSpec(Old, New)) 364 Invalid = true; 365 366 return Invalid; 367} 368 369/// CheckCXXDefaultArguments - Verify that the default arguments for a 370/// function declaration are well-formed according to C++ 371/// [dcl.fct.default]. 372void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 373 unsigned NumParams = FD->getNumParams(); 374 unsigned p; 375 376 // Find first parameter with a default argument 377 for (p = 0; p < NumParams; ++p) { 378 ParmVarDecl *Param = FD->getParamDecl(p); 379 if (Param->hasDefaultArg()) 380 break; 381 } 382 383 // C++ [dcl.fct.default]p4: 384 // In a given function declaration, all parameters 385 // subsequent to a parameter with a default argument shall 386 // have default arguments supplied in this or previous 387 // declarations. A default argument shall not be redefined 388 // by a later declaration (not even to the same value). 389 unsigned LastMissingDefaultArg = 0; 390 for (; p < NumParams; ++p) { 391 ParmVarDecl *Param = FD->getParamDecl(p); 392 if (!Param->hasDefaultArg()) { 393 if (Param->isInvalidDecl()) 394 /* We already complained about this parameter. */; 395 else if (Param->getIdentifier()) 396 Diag(Param->getLocation(), 397 diag::err_param_default_argument_missing_name) 398 << Param->getIdentifier(); 399 else 400 Diag(Param->getLocation(), 401 diag::err_param_default_argument_missing); 402 403 LastMissingDefaultArg = p; 404 } 405 } 406 407 if (LastMissingDefaultArg > 0) { 408 // Some default arguments were missing. Clear out all of the 409 // default arguments up to (and including) the last missing 410 // default argument, so that we leave the function parameters 411 // in a semantically valid state. 412 for (p = 0; p <= LastMissingDefaultArg; ++p) { 413 ParmVarDecl *Param = FD->getParamDecl(p); 414 if (Param->hasDefaultArg()) { 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 TypeSourceInfo *TInfo) { 451 QualType BaseType = TInfo->getType(); 452 453 // C++ [class.union]p1: 454 // A union shall not have base classes. 455 if (Class->isUnion()) { 456 Diag(Class->getLocation(), diag::err_base_clause_on_union) 457 << SpecifierRange; 458 return 0; 459 } 460 461 if (BaseType->isDependentType()) 462 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 463 Class->getTagKind() == TTK_Class, 464 Access, TInfo); 465 466 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 467 468 // Base specifiers must be record types. 469 if (!BaseType->isRecordType()) { 470 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 471 return 0; 472 } 473 474 // C++ [class.union]p1: 475 // A union shall not be used as a base class. 476 if (BaseType->isUnionType()) { 477 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 478 return 0; 479 } 480 481 // C++ [class.derived]p2: 482 // The class-name in a base-specifier shall not be an incompletely 483 // defined class. 484 if (RequireCompleteType(BaseLoc, BaseType, 485 PDiag(diag::err_incomplete_base_class) 486 << SpecifierRange)) 487 return 0; 488 489 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 490 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 491 assert(BaseDecl && "Record type has no declaration"); 492 BaseDecl = BaseDecl->getDefinition(); 493 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 494 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 495 assert(CXXBaseDecl && "Base type is not a C++ type"); 496 497 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 498 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 499 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 500 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 501 << BaseType; 502 return 0; 503 } 504 505 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 506 507 // Create the base specifier. 508 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 509 Class->getTagKind() == TTK_Class, 510 Access, TInfo); 511} 512 513void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 514 const CXXRecordDecl *BaseClass, 515 bool BaseIsVirtual) { 516 // A class with a non-empty base class is not empty. 517 // FIXME: Standard ref? 518 if (!BaseClass->isEmpty()) 519 Class->setEmpty(false); 520 521 // C++ [class.virtual]p1: 522 // A class that [...] inherits a virtual function is called a polymorphic 523 // class. 524 if (BaseClass->isPolymorphic()) 525 Class->setPolymorphic(true); 526 527 // C++ [dcl.init.aggr]p1: 528 // An aggregate is [...] a class with [...] no base classes [...]. 529 Class->setAggregate(false); 530 531 // C++ [class]p4: 532 // A POD-struct is an aggregate class... 533 Class->setPOD(false); 534 535 if (BaseIsVirtual) { 536 // C++ [class.ctor]p5: 537 // A constructor is trivial if its class has no virtual base classes. 538 Class->setHasTrivialConstructor(false); 539 540 // C++ [class.copy]p6: 541 // A copy constructor is trivial if its class has no virtual base classes. 542 Class->setHasTrivialCopyConstructor(false); 543 544 // C++ [class.copy]p11: 545 // A copy assignment operator is trivial if its class has no virtual 546 // base classes. 547 Class->setHasTrivialCopyAssignment(false); 548 549 // C++0x [meta.unary.prop] is_empty: 550 // T is a class type, but not a union type, with ... no virtual base 551 // classes 552 Class->setEmpty(false); 553 } else { 554 // C++ [class.ctor]p5: 555 // A constructor is trivial if all the direct base classes of its 556 // class have trivial constructors. 557 if (!BaseClass->hasTrivialConstructor()) 558 Class->setHasTrivialConstructor(false); 559 560 // C++ [class.copy]p6: 561 // A copy constructor is trivial if all the direct base classes of its 562 // class have trivial copy constructors. 563 if (!BaseClass->hasTrivialCopyConstructor()) 564 Class->setHasTrivialCopyConstructor(false); 565 566 // C++ [class.copy]p11: 567 // A copy assignment operator is trivial if all the direct base classes 568 // of its class have trivial copy assignment operators. 569 if (!BaseClass->hasTrivialCopyAssignment()) 570 Class->setHasTrivialCopyAssignment(false); 571 } 572 573 // C++ [class.ctor]p3: 574 // A destructor is trivial if all the direct base classes of its class 575 // have trivial destructors. 576 if (!BaseClass->hasTrivialDestructor()) 577 Class->setHasTrivialDestructor(false); 578} 579 580/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 581/// one entry in the base class list of a class specifier, for 582/// example: 583/// class foo : public bar, virtual private baz { 584/// 'public bar' and 'virtual private baz' are each base-specifiers. 585Sema::BaseResult 586Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 587 bool Virtual, AccessSpecifier Access, 588 TypeTy *basetype, SourceLocation BaseLoc) { 589 if (!classdecl) 590 return true; 591 592 AdjustDeclIfTemplate(classdecl); 593 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 594 if (!Class) 595 return true; 596 597 TypeSourceInfo *TInfo = 0; 598 GetTypeFromParser(basetype, &TInfo); 599 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 600 Virtual, Access, TInfo)) 601 return BaseSpec; 602 603 return true; 604} 605 606/// \brief Performs the actual work of attaching the given base class 607/// specifiers to a C++ class. 608bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 609 unsigned NumBases) { 610 if (NumBases == 0) 611 return false; 612 613 // Used to keep track of which base types we have already seen, so 614 // that we can properly diagnose redundant direct base types. Note 615 // that the key is always the unqualified canonical type of the base 616 // class. 617 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 618 619 // Copy non-redundant base specifiers into permanent storage. 620 unsigned NumGoodBases = 0; 621 bool Invalid = false; 622 for (unsigned idx = 0; idx < NumBases; ++idx) { 623 QualType NewBaseType 624 = Context.getCanonicalType(Bases[idx]->getType()); 625 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 626 if (!Class->hasObjectMember()) { 627 if (const RecordType *FDTTy = 628 NewBaseType.getTypePtr()->getAs<RecordType>()) 629 if (FDTTy->getDecl()->hasObjectMember()) 630 Class->setHasObjectMember(true); 631 } 632 633 if (KnownBaseTypes[NewBaseType]) { 634 // C++ [class.mi]p3: 635 // A class shall not be specified as a direct base class of a 636 // derived class more than once. 637 Diag(Bases[idx]->getSourceRange().getBegin(), 638 diag::err_duplicate_base_class) 639 << KnownBaseTypes[NewBaseType]->getType() 640 << Bases[idx]->getSourceRange(); 641 642 // Delete the duplicate base class specifier; we're going to 643 // overwrite its pointer later. 644 Context.Deallocate(Bases[idx]); 645 646 Invalid = true; 647 } else { 648 // Okay, add this new base class. 649 KnownBaseTypes[NewBaseType] = Bases[idx]; 650 Bases[NumGoodBases++] = Bases[idx]; 651 } 652 } 653 654 // Attach the remaining base class specifiers to the derived class. 655 Class->setBases(Bases, NumGoodBases); 656 657 // Delete the remaining (good) base class specifiers, since their 658 // data has been copied into the CXXRecordDecl. 659 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 660 Context.Deallocate(Bases[idx]); 661 662 return Invalid; 663} 664 665/// ActOnBaseSpecifiers - Attach the given base specifiers to the 666/// class, after checking whether there are any duplicate base 667/// classes. 668void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 669 unsigned NumBases) { 670 if (!ClassDecl || !Bases || !NumBases) 671 return; 672 673 AdjustDeclIfTemplate(ClassDecl); 674 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 675 (CXXBaseSpecifier**)(Bases), NumBases); 676} 677 678static CXXRecordDecl *GetClassForType(QualType T) { 679 if (const RecordType *RT = T->getAs<RecordType>()) 680 return cast<CXXRecordDecl>(RT->getDecl()); 681 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 682 return ICT->getDecl(); 683 else 684 return 0; 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) { 690 if (!getLangOptions().CPlusPlus) 691 return false; 692 693 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 694 if (!DerivedRD) 695 return false; 696 697 CXXRecordDecl *BaseRD = GetClassForType(Base); 698 if (!BaseRD) 699 return false; 700 701 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 702 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 703} 704 705/// \brief Determine whether the type \p Derived is a C++ class that is 706/// derived from the type \p Base. 707bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 708 if (!getLangOptions().CPlusPlus) 709 return false; 710 711 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 712 if (!DerivedRD) 713 return false; 714 715 CXXRecordDecl *BaseRD = GetClassForType(Base); 716 if (!BaseRD) 717 return false; 718 719 return DerivedRD->isDerivedFrom(BaseRD, Paths); 720} 721 722void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 723 CXXCastPath &BasePathArray) { 724 assert(BasePathArray.empty() && "Base path array must be empty!"); 725 assert(Paths.isRecordingPaths() && "Must record paths!"); 726 727 const CXXBasePath &Path = Paths.front(); 728 729 // We first go backward and check if we have a virtual base. 730 // FIXME: It would be better if CXXBasePath had the base specifier for 731 // the nearest virtual base. 732 unsigned Start = 0; 733 for (unsigned I = Path.size(); I != 0; --I) { 734 if (Path[I - 1].Base->isVirtual()) { 735 Start = I - 1; 736 break; 737 } 738 } 739 740 // Now add all bases. 741 for (unsigned I = Start, E = Path.size(); I != E; ++I) 742 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 743} 744 745/// \brief Determine whether the given base path includes a virtual 746/// base class. 747bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 748 for (CXXCastPath::const_iterator B = BasePath.begin(), 749 BEnd = BasePath.end(); 750 B != BEnd; ++B) 751 if ((*B)->isVirtual()) 752 return true; 753 754 return false; 755} 756 757/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 758/// conversion (where Derived and Base are class types) is 759/// well-formed, meaning that the conversion is unambiguous (and 760/// that all of the base classes are accessible). Returns true 761/// and emits a diagnostic if the code is ill-formed, returns false 762/// otherwise. Loc is the location where this routine should point to 763/// if there is an error, and Range is the source range to highlight 764/// if there is an error. 765bool 766Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 767 unsigned InaccessibleBaseID, 768 unsigned AmbigiousBaseConvID, 769 SourceLocation Loc, SourceRange Range, 770 DeclarationName Name, 771 CXXCastPath *BasePath) { 772 // First, determine whether the path from Derived to Base is 773 // ambiguous. This is slightly more expensive than checking whether 774 // the Derived to Base conversion exists, because here we need to 775 // explore multiple paths to determine if there is an ambiguity. 776 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 777 /*DetectVirtual=*/false); 778 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 779 assert(DerivationOkay && 780 "Can only be used with a derived-to-base conversion"); 781 (void)DerivationOkay; 782 783 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 784 if (InaccessibleBaseID) { 785 // Check that the base class can be accessed. 786 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 787 InaccessibleBaseID)) { 788 case AR_inaccessible: 789 return true; 790 case AR_accessible: 791 case AR_dependent: 792 case AR_delayed: 793 break; 794 } 795 } 796 797 // Build a base path if necessary. 798 if (BasePath) 799 BuildBasePathArray(Paths, *BasePath); 800 return false; 801 } 802 803 // We know that the derived-to-base conversion is ambiguous, and 804 // we're going to produce a diagnostic. Perform the derived-to-base 805 // search just one more time to compute all of the possible paths so 806 // that we can print them out. This is more expensive than any of 807 // the previous derived-to-base checks we've done, but at this point 808 // performance isn't as much of an issue. 809 Paths.clear(); 810 Paths.setRecordingPaths(true); 811 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 812 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 813 (void)StillOkay; 814 815 // Build up a textual representation of the ambiguous paths, e.g., 816 // D -> B -> A, that will be used to illustrate the ambiguous 817 // conversions in the diagnostic. We only print one of the paths 818 // to each base class subobject. 819 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 820 821 Diag(Loc, AmbigiousBaseConvID) 822 << Derived << Base << PathDisplayStr << Range << Name; 823 return true; 824} 825 826bool 827Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 828 SourceLocation Loc, SourceRange Range, 829 CXXCastPath *BasePath, 830 bool IgnoreAccess) { 831 return CheckDerivedToBaseConversion(Derived, Base, 832 IgnoreAccess ? 0 833 : diag::err_upcast_to_inaccessible_base, 834 diag::err_ambiguous_derived_to_base_conv, 835 Loc, Range, DeclarationName(), 836 BasePath); 837} 838 839 840/// @brief Builds a string representing ambiguous paths from a 841/// specific derived class to different subobjects of the same base 842/// class. 843/// 844/// This function builds a string that can be used in error messages 845/// to show the different paths that one can take through the 846/// inheritance hierarchy to go from the derived class to different 847/// subobjects of a base class. The result looks something like this: 848/// @code 849/// struct D -> struct B -> struct A 850/// struct D -> struct C -> struct A 851/// @endcode 852std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 853 std::string PathDisplayStr; 854 std::set<unsigned> DisplayedPaths; 855 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 856 Path != Paths.end(); ++Path) { 857 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 858 // We haven't displayed a path to this particular base 859 // class subobject yet. 860 PathDisplayStr += "\n "; 861 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 862 for (CXXBasePath::const_iterator Element = Path->begin(); 863 Element != Path->end(); ++Element) 864 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 865 } 866 } 867 868 return PathDisplayStr; 869} 870 871//===----------------------------------------------------------------------===// 872// C++ class member Handling 873//===----------------------------------------------------------------------===// 874 875/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 876Sema::DeclPtrTy 877Sema::ActOnAccessSpecifier(AccessSpecifier Access, 878 SourceLocation ASLoc, SourceLocation ColonLoc) { 879 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 880 AccessSpecDecl* ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 881 ASLoc, ColonLoc); 882 CurContext->addHiddenDecl(ASDecl); 883 return DeclPtrTy::make(ASDecl); 884} 885 886/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 887/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 888/// bitfield width if there is one and 'InitExpr' specifies the initializer if 889/// any. 890Sema::DeclPtrTy 891Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 892 MultiTemplateParamsArg TemplateParameterLists, 893 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 894 bool Deleted) { 895 const DeclSpec &DS = D.getDeclSpec(); 896 DeclarationName Name = GetNameForDeclarator(D); 897 Expr *BitWidth = static_cast<Expr*>(BW); 898 Expr *Init = static_cast<Expr*>(InitExpr); 899 SourceLocation Loc = D.getIdentifierLoc(); 900 901 assert(isa<CXXRecordDecl>(CurContext)); 902 assert(!DS.isFriendSpecified()); 903 904 bool isFunc = false; 905 if (D.isFunctionDeclarator()) 906 isFunc = true; 907 else if (D.getNumTypeObjects() == 0 && 908 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 909 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 910 isFunc = TDType->isFunctionType(); 911 } 912 913 // C++ 9.2p6: A member shall not be declared to have automatic storage 914 // duration (auto, register) or with the extern storage-class-specifier. 915 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 916 // data members and cannot be applied to names declared const or static, 917 // and cannot be applied to reference members. 918 switch (DS.getStorageClassSpec()) { 919 case DeclSpec::SCS_unspecified: 920 case DeclSpec::SCS_typedef: 921 case DeclSpec::SCS_static: 922 // FALL THROUGH. 923 break; 924 case DeclSpec::SCS_mutable: 925 if (isFunc) { 926 if (DS.getStorageClassSpecLoc().isValid()) 927 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 928 else 929 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 930 931 // FIXME: It would be nicer if the keyword was ignored only for this 932 // declarator. Otherwise we could get follow-up errors. 933 D.getMutableDeclSpec().ClearStorageClassSpecs(); 934 } 935 break; 936 default: 937 if (DS.getStorageClassSpecLoc().isValid()) 938 Diag(DS.getStorageClassSpecLoc(), 939 diag::err_storageclass_invalid_for_member); 940 else 941 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 942 D.getMutableDeclSpec().ClearStorageClassSpecs(); 943 } 944 945 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 946 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 947 !isFunc); 948 949 Decl *Member; 950 if (isInstField) { 951 // FIXME: Check for template parameters! 952 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 953 AS); 954 assert(Member && "HandleField never returns null"); 955 } else { 956 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 957 .getAs<Decl>(); 958 if (!Member) { 959 if (BitWidth) DeleteExpr(BitWidth); 960 return DeclPtrTy(); 961 } 962 963 // Non-instance-fields can't have a bitfield. 964 if (BitWidth) { 965 if (Member->isInvalidDecl()) { 966 // don't emit another diagnostic. 967 } else if (isa<VarDecl>(Member)) { 968 // C++ 9.6p3: A bit-field shall not be a static member. 969 // "static member 'A' cannot be a bit-field" 970 Diag(Loc, diag::err_static_not_bitfield) 971 << Name << BitWidth->getSourceRange(); 972 } else if (isa<TypedefDecl>(Member)) { 973 // "typedef member 'x' cannot be a bit-field" 974 Diag(Loc, diag::err_typedef_not_bitfield) 975 << Name << BitWidth->getSourceRange(); 976 } else { 977 // A function typedef ("typedef int f(); f a;"). 978 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 979 Diag(Loc, diag::err_not_integral_type_bitfield) 980 << Name << cast<ValueDecl>(Member)->getType() 981 << BitWidth->getSourceRange(); 982 } 983 984 DeleteExpr(BitWidth); 985 BitWidth = 0; 986 Member->setInvalidDecl(); 987 } 988 989 Member->setAccess(AS); 990 991 // If we have declared a member function template, set the access of the 992 // templated declaration as well. 993 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 994 FunTmpl->getTemplatedDecl()->setAccess(AS); 995 } 996 997 assert((Name || isInstField) && "No identifier for non-field ?"); 998 999 if (Init) 1000 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 1001 if (Deleted) // FIXME: Source location is not very good. 1002 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 1003 1004 if (isInstField) { 1005 FieldCollector->Add(cast<FieldDecl>(Member)); 1006 return DeclPtrTy(); 1007 } 1008 return DeclPtrTy::make(Member); 1009} 1010 1011/// \brief Find the direct and/or virtual base specifiers that 1012/// correspond to the given base type, for use in base initialization 1013/// within a constructor. 1014static bool FindBaseInitializer(Sema &SemaRef, 1015 CXXRecordDecl *ClassDecl, 1016 QualType BaseType, 1017 const CXXBaseSpecifier *&DirectBaseSpec, 1018 const CXXBaseSpecifier *&VirtualBaseSpec) { 1019 // First, check for a direct base class. 1020 DirectBaseSpec = 0; 1021 for (CXXRecordDecl::base_class_const_iterator Base 1022 = ClassDecl->bases_begin(); 1023 Base != ClassDecl->bases_end(); ++Base) { 1024 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1025 // We found a direct base of this type. That's what we're 1026 // initializing. 1027 DirectBaseSpec = &*Base; 1028 break; 1029 } 1030 } 1031 1032 // Check for a virtual base class. 1033 // FIXME: We might be able to short-circuit this if we know in advance that 1034 // there are no virtual bases. 1035 VirtualBaseSpec = 0; 1036 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1037 // We haven't found a base yet; search the class hierarchy for a 1038 // virtual base class. 1039 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1040 /*DetectVirtual=*/false); 1041 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1042 BaseType, Paths)) { 1043 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1044 Path != Paths.end(); ++Path) { 1045 if (Path->back().Base->isVirtual()) { 1046 VirtualBaseSpec = Path->back().Base; 1047 break; 1048 } 1049 } 1050 } 1051 } 1052 1053 return DirectBaseSpec || VirtualBaseSpec; 1054} 1055 1056/// ActOnMemInitializer - Handle a C++ member initializer. 1057Sema::MemInitResult 1058Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1059 Scope *S, 1060 CXXScopeSpec &SS, 1061 IdentifierInfo *MemberOrBase, 1062 TypeTy *TemplateTypeTy, 1063 SourceLocation IdLoc, 1064 SourceLocation LParenLoc, 1065 ExprTy **Args, unsigned NumArgs, 1066 SourceLocation *CommaLocs, 1067 SourceLocation RParenLoc) { 1068 if (!ConstructorD) 1069 return true; 1070 1071 AdjustDeclIfTemplate(ConstructorD); 1072 1073 CXXConstructorDecl *Constructor 1074 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1075 if (!Constructor) { 1076 // The user wrote a constructor initializer on a function that is 1077 // not a C++ constructor. Ignore the error for now, because we may 1078 // have more member initializers coming; we'll diagnose it just 1079 // once in ActOnMemInitializers. 1080 return true; 1081 } 1082 1083 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1084 1085 // C++ [class.base.init]p2: 1086 // Names in a mem-initializer-id are looked up in the scope of the 1087 // constructor’s class and, if not found in that scope, are looked 1088 // up in the scope containing the constructor’s 1089 // definition. [Note: if the constructor’s class contains a member 1090 // with the same name as a direct or virtual base class of the 1091 // class, a mem-initializer-id naming the member or base class and 1092 // composed of a single identifier refers to the class member. A 1093 // mem-initializer-id for the hidden base class may be specified 1094 // using a qualified name. ] 1095 if (!SS.getScopeRep() && !TemplateTypeTy) { 1096 // Look for a member, first. 1097 FieldDecl *Member = 0; 1098 DeclContext::lookup_result Result 1099 = ClassDecl->lookup(MemberOrBase); 1100 if (Result.first != Result.second) 1101 Member = dyn_cast<FieldDecl>(*Result.first); 1102 1103 // FIXME: Handle members of an anonymous union. 1104 1105 if (Member) 1106 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1107 LParenLoc, RParenLoc); 1108 } 1109 // It didn't name a member, so see if it names a class. 1110 QualType BaseType; 1111 TypeSourceInfo *TInfo = 0; 1112 1113 if (TemplateTypeTy) { 1114 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1115 } else { 1116 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1117 LookupParsedName(R, S, &SS); 1118 1119 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1120 if (!TyD) { 1121 if (R.isAmbiguous()) return true; 1122 1123 // We don't want access-control diagnostics here. 1124 R.suppressDiagnostics(); 1125 1126 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1127 bool NotUnknownSpecialization = false; 1128 DeclContext *DC = computeDeclContext(SS, false); 1129 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1130 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1131 1132 if (!NotUnknownSpecialization) { 1133 // When the scope specifier can refer to a member of an unknown 1134 // specialization, we take it as a type name. 1135 BaseType = CheckTypenameType(ETK_None, 1136 (NestedNameSpecifier *)SS.getScopeRep(), 1137 *MemberOrBase, SourceLocation(), 1138 SS.getRange(), IdLoc); 1139 if (BaseType.isNull()) 1140 return true; 1141 1142 R.clear(); 1143 R.setLookupName(MemberOrBase); 1144 } 1145 } 1146 1147 // If no results were found, try to correct typos. 1148 if (R.empty() && BaseType.isNull() && 1149 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1150 R.isSingleResult()) { 1151 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1152 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1153 // We have found a non-static data member with a similar 1154 // name to what was typed; complain and initialize that 1155 // member. 1156 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1157 << MemberOrBase << true << R.getLookupName() 1158 << FixItHint::CreateReplacement(R.getNameLoc(), 1159 R.getLookupName().getAsString()); 1160 Diag(Member->getLocation(), diag::note_previous_decl) 1161 << Member->getDeclName(); 1162 1163 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1164 LParenLoc, RParenLoc); 1165 } 1166 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1167 const CXXBaseSpecifier *DirectBaseSpec; 1168 const CXXBaseSpecifier *VirtualBaseSpec; 1169 if (FindBaseInitializer(*this, ClassDecl, 1170 Context.getTypeDeclType(Type), 1171 DirectBaseSpec, VirtualBaseSpec)) { 1172 // We have found a direct or virtual base class with a 1173 // similar name to what was typed; complain and initialize 1174 // that base class. 1175 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1176 << MemberOrBase << false << R.getLookupName() 1177 << FixItHint::CreateReplacement(R.getNameLoc(), 1178 R.getLookupName().getAsString()); 1179 1180 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1181 : VirtualBaseSpec; 1182 Diag(BaseSpec->getSourceRange().getBegin(), 1183 diag::note_base_class_specified_here) 1184 << BaseSpec->getType() 1185 << BaseSpec->getSourceRange(); 1186 1187 TyD = Type; 1188 } 1189 } 1190 } 1191 1192 if (!TyD && BaseType.isNull()) { 1193 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1194 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1195 return true; 1196 } 1197 } 1198 1199 if (BaseType.isNull()) { 1200 BaseType = Context.getTypeDeclType(TyD); 1201 if (SS.isSet()) { 1202 NestedNameSpecifier *Qualifier = 1203 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1204 1205 // FIXME: preserve source range information 1206 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1207 } 1208 } 1209 } 1210 1211 if (!TInfo) 1212 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1213 1214 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1215 LParenLoc, RParenLoc, ClassDecl); 1216} 1217 1218/// Checks an initializer expression for use of uninitialized fields, such as 1219/// containing the field that is being initialized. Returns true if there is an 1220/// uninitialized field was used an updates the SourceLocation parameter; false 1221/// otherwise. 1222static bool InitExprContainsUninitializedFields(const Stmt *S, 1223 const FieldDecl *LhsField, 1224 SourceLocation *L) { 1225 if (isa<CallExpr>(S)) { 1226 // Do not descend into function calls or constructors, as the use 1227 // of an uninitialized field may be valid. One would have to inspect 1228 // the contents of the function/ctor to determine if it is safe or not. 1229 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1230 // may be safe, depending on what the function/ctor does. 1231 return false; 1232 } 1233 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1234 const NamedDecl *RhsField = ME->getMemberDecl(); 1235 if (RhsField == LhsField) { 1236 // Initializing a field with itself. Throw a warning. 1237 // But wait; there are exceptions! 1238 // Exception #1: The field may not belong to this record. 1239 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1240 const Expr *base = ME->getBase(); 1241 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1242 // Even though the field matches, it does not belong to this record. 1243 return false; 1244 } 1245 // None of the exceptions triggered; return true to indicate an 1246 // uninitialized field was used. 1247 *L = ME->getMemberLoc(); 1248 return true; 1249 } 1250 } 1251 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1252 it != e; ++it) { 1253 if (!*it) { 1254 // An expression such as 'member(arg ?: "")' may trigger this. 1255 continue; 1256 } 1257 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1258 return true; 1259 } 1260 return false; 1261} 1262 1263Sema::MemInitResult 1264Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1265 unsigned NumArgs, SourceLocation IdLoc, 1266 SourceLocation LParenLoc, 1267 SourceLocation RParenLoc) { 1268 // Diagnose value-uses of fields to initialize themselves, e.g. 1269 // foo(foo) 1270 // where foo is not also a parameter to the constructor. 1271 // TODO: implement -Wuninitialized and fold this into that framework. 1272 for (unsigned i = 0; i < NumArgs; ++i) { 1273 SourceLocation L; 1274 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1275 // FIXME: Return true in the case when other fields are used before being 1276 // uninitialized. For example, let this field be the i'th field. When 1277 // initializing the i'th field, throw a warning if any of the >= i'th 1278 // fields are used, as they are not yet initialized. 1279 // Right now we are only handling the case where the i'th field uses 1280 // itself in its initializer. 1281 Diag(L, diag::warn_field_is_uninit); 1282 } 1283 } 1284 1285 bool HasDependentArg = false; 1286 for (unsigned i = 0; i < NumArgs; i++) 1287 HasDependentArg |= Args[i]->isTypeDependent(); 1288 1289 if (Member->getType()->isDependentType() || HasDependentArg) { 1290 // Can't check initialization for a member of dependent type or when 1291 // any of the arguments are type-dependent expressions. 1292 OwningExprResult Init 1293 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1294 RParenLoc)); 1295 1296 // Erase any temporaries within this evaluation context; we're not 1297 // going to track them in the AST, since we'll be rebuilding the 1298 // ASTs during template instantiation. 1299 ExprTemporaries.erase( 1300 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1301 ExprTemporaries.end()); 1302 1303 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1304 LParenLoc, 1305 Init.takeAs<Expr>(), 1306 RParenLoc); 1307 1308 } 1309 1310 if (Member->isInvalidDecl()) 1311 return true; 1312 1313 // Initialize the member. 1314 InitializedEntity MemberEntity = 1315 InitializedEntity::InitializeMember(Member, 0); 1316 InitializationKind Kind = 1317 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1318 1319 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1320 1321 OwningExprResult MemberInit = 1322 InitSeq.Perform(*this, MemberEntity, Kind, 1323 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1324 if (MemberInit.isInvalid()) 1325 return true; 1326 1327 // C++0x [class.base.init]p7: 1328 // The initialization of each base and member constitutes a 1329 // full-expression. 1330 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1331 if (MemberInit.isInvalid()) 1332 return true; 1333 1334 // If we are in a dependent context, template instantiation will 1335 // perform this type-checking again. Just save the arguments that we 1336 // received in a ParenListExpr. 1337 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1338 // of the information that we have about the member 1339 // initializer. However, deconstructing the ASTs is a dicey process, 1340 // and this approach is far more likely to get the corner cases right. 1341 if (CurContext->isDependentContext()) { 1342 // Bump the reference count of all of the arguments. 1343 for (unsigned I = 0; I != NumArgs; ++I) 1344 Args[I]->Retain(); 1345 1346 OwningExprResult Init 1347 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1348 RParenLoc)); 1349 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1350 LParenLoc, 1351 Init.takeAs<Expr>(), 1352 RParenLoc); 1353 } 1354 1355 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1356 LParenLoc, 1357 MemberInit.takeAs<Expr>(), 1358 RParenLoc); 1359} 1360 1361Sema::MemInitResult 1362Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1363 Expr **Args, unsigned NumArgs, 1364 SourceLocation LParenLoc, SourceLocation RParenLoc, 1365 CXXRecordDecl *ClassDecl) { 1366 bool HasDependentArg = false; 1367 for (unsigned i = 0; i < NumArgs; i++) 1368 HasDependentArg |= Args[i]->isTypeDependent(); 1369 1370 SourceLocation BaseLoc 1371 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1372 1373 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1374 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1375 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1376 1377 // C++ [class.base.init]p2: 1378 // [...] Unless the mem-initializer-id names a nonstatic data 1379 // member of the constructor’s class or a direct or virtual base 1380 // of that class, the mem-initializer is ill-formed. A 1381 // mem-initializer-list can initialize a base class using any 1382 // name that denotes that base class type. 1383 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1384 1385 // Check for direct and virtual base classes. 1386 const CXXBaseSpecifier *DirectBaseSpec = 0; 1387 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1388 if (!Dependent) { 1389 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1390 VirtualBaseSpec); 1391 1392 // C++ [base.class.init]p2: 1393 // Unless the mem-initializer-id names a nonstatic data member of the 1394 // constructor's class or a direct or virtual base of that class, the 1395 // mem-initializer is ill-formed. 1396 if (!DirectBaseSpec && !VirtualBaseSpec) { 1397 // If the class has any dependent bases, then it's possible that 1398 // one of those types will resolve to the same type as 1399 // BaseType. Therefore, just treat this as a dependent base 1400 // class initialization. FIXME: Should we try to check the 1401 // initialization anyway? It seems odd. 1402 if (ClassDecl->hasAnyDependentBases()) 1403 Dependent = true; 1404 else 1405 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1406 << BaseType << Context.getTypeDeclType(ClassDecl) 1407 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1408 } 1409 } 1410 1411 if (Dependent) { 1412 // Can't check initialization for a base of dependent type or when 1413 // any of the arguments are type-dependent expressions. 1414 OwningExprResult BaseInit 1415 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1416 RParenLoc)); 1417 1418 // Erase any temporaries within this evaluation context; we're not 1419 // going to track them in the AST, since we'll be rebuilding the 1420 // ASTs during template instantiation. 1421 ExprTemporaries.erase( 1422 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1423 ExprTemporaries.end()); 1424 1425 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1426 /*IsVirtual=*/false, 1427 LParenLoc, 1428 BaseInit.takeAs<Expr>(), 1429 RParenLoc); 1430 } 1431 1432 // C++ [base.class.init]p2: 1433 // If a mem-initializer-id is ambiguous because it designates both 1434 // a direct non-virtual base class and an inherited virtual base 1435 // class, the mem-initializer is ill-formed. 1436 if (DirectBaseSpec && VirtualBaseSpec) 1437 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1438 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1439 1440 CXXBaseSpecifier *BaseSpec 1441 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1442 if (!BaseSpec) 1443 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1444 1445 // Initialize the base. 1446 InitializedEntity BaseEntity = 1447 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1448 InitializationKind Kind = 1449 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1450 1451 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1452 1453 OwningExprResult BaseInit = 1454 InitSeq.Perform(*this, BaseEntity, Kind, 1455 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1456 if (BaseInit.isInvalid()) 1457 return true; 1458 1459 // C++0x [class.base.init]p7: 1460 // The initialization of each base and member constitutes a 1461 // full-expression. 1462 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1463 if (BaseInit.isInvalid()) 1464 return true; 1465 1466 // If we are in a dependent context, template instantiation will 1467 // perform this type-checking again. Just save the arguments that we 1468 // received in a ParenListExpr. 1469 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1470 // of the information that we have about the base 1471 // initializer. However, deconstructing the ASTs is a dicey process, 1472 // and this approach is far more likely to get the corner cases right. 1473 if (CurContext->isDependentContext()) { 1474 // Bump the reference count of all of the arguments. 1475 for (unsigned I = 0; I != NumArgs; ++I) 1476 Args[I]->Retain(); 1477 1478 OwningExprResult Init 1479 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1480 RParenLoc)); 1481 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1482 BaseSpec->isVirtual(), 1483 LParenLoc, 1484 Init.takeAs<Expr>(), 1485 RParenLoc); 1486 } 1487 1488 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1489 BaseSpec->isVirtual(), 1490 LParenLoc, 1491 BaseInit.takeAs<Expr>(), 1492 RParenLoc); 1493} 1494 1495/// ImplicitInitializerKind - How an implicit base or member initializer should 1496/// initialize its base or member. 1497enum ImplicitInitializerKind { 1498 IIK_Default, 1499 IIK_Copy, 1500 IIK_Move 1501}; 1502 1503static bool 1504BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1505 ImplicitInitializerKind ImplicitInitKind, 1506 CXXBaseSpecifier *BaseSpec, 1507 bool IsInheritedVirtualBase, 1508 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1509 InitializedEntity InitEntity 1510 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1511 IsInheritedVirtualBase); 1512 1513 Sema::OwningExprResult BaseInit(SemaRef); 1514 1515 switch (ImplicitInitKind) { 1516 case IIK_Default: { 1517 InitializationKind InitKind 1518 = InitializationKind::CreateDefault(Constructor->getLocation()); 1519 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1520 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1521 Sema::MultiExprArg(SemaRef, 0, 0)); 1522 break; 1523 } 1524 1525 case IIK_Copy: { 1526 ParmVarDecl *Param = Constructor->getParamDecl(0); 1527 QualType ParamType = Param->getType().getNonReferenceType(); 1528 1529 Expr *CopyCtorArg = 1530 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1531 Constructor->getLocation(), ParamType, 0); 1532 1533 // Cast to the base class to avoid ambiguities. 1534 QualType ArgTy = 1535 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1536 ParamType.getQualifiers()); 1537 1538 CXXCastPath BasePath; 1539 BasePath.push_back(BaseSpec); 1540 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1541 CastExpr::CK_UncheckedDerivedToBase, 1542 ImplicitCastExpr::LValue, &BasePath); 1543 1544 InitializationKind InitKind 1545 = InitializationKind::CreateDirect(Constructor->getLocation(), 1546 SourceLocation(), SourceLocation()); 1547 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1548 &CopyCtorArg, 1); 1549 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1550 Sema::MultiExprArg(SemaRef, 1551 (void**)&CopyCtorArg, 1)); 1552 break; 1553 } 1554 1555 case IIK_Move: 1556 assert(false && "Unhandled initializer kind!"); 1557 } 1558 1559 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1560 if (BaseInit.isInvalid()) 1561 return true; 1562 1563 CXXBaseInit = 1564 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1565 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1566 SourceLocation()), 1567 BaseSpec->isVirtual(), 1568 SourceLocation(), 1569 BaseInit.takeAs<Expr>(), 1570 SourceLocation()); 1571 1572 return false; 1573} 1574 1575static bool 1576BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1577 ImplicitInitializerKind ImplicitInitKind, 1578 FieldDecl *Field, 1579 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1580 if (Field->isInvalidDecl()) 1581 return true; 1582 1583 SourceLocation Loc = Constructor->getLocation(); 1584 1585 if (ImplicitInitKind == IIK_Copy) { 1586 ParmVarDecl *Param = Constructor->getParamDecl(0); 1587 QualType ParamType = Param->getType().getNonReferenceType(); 1588 1589 Expr *MemberExprBase = 1590 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1591 Loc, ParamType, 0); 1592 1593 // Build a reference to this field within the parameter. 1594 CXXScopeSpec SS; 1595 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1596 Sema::LookupMemberName); 1597 MemberLookup.addDecl(Field, AS_public); 1598 MemberLookup.resolveKind(); 1599 Sema::OwningExprResult CopyCtorArg 1600 = SemaRef.BuildMemberReferenceExpr(SemaRef.Owned(MemberExprBase), 1601 ParamType, Loc, 1602 /*IsArrow=*/false, 1603 SS, 1604 /*FirstQualifierInScope=*/0, 1605 MemberLookup, 1606 /*TemplateArgs=*/0); 1607 if (CopyCtorArg.isInvalid()) 1608 return true; 1609 1610 // When the field we are copying is an array, create index variables for 1611 // each dimension of the array. We use these index variables to subscript 1612 // the source array, and other clients (e.g., CodeGen) will perform the 1613 // necessary iteration with these index variables. 1614 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1615 QualType BaseType = Field->getType(); 1616 QualType SizeType = SemaRef.Context.getSizeType(); 1617 while (const ConstantArrayType *Array 1618 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1619 // Create the iteration variable for this array index. 1620 IdentifierInfo *IterationVarName = 0; 1621 { 1622 llvm::SmallString<8> Str; 1623 llvm::raw_svector_ostream OS(Str); 1624 OS << "__i" << IndexVariables.size(); 1625 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1626 } 1627 VarDecl *IterationVar 1628 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1629 IterationVarName, SizeType, 1630 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1631 VarDecl::None, VarDecl::None); 1632 IndexVariables.push_back(IterationVar); 1633 1634 // Create a reference to the iteration variable. 1635 Sema::OwningExprResult IterationVarRef 1636 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1637 assert(!IterationVarRef.isInvalid() && 1638 "Reference to invented variable cannot fail!"); 1639 1640 // Subscript the array with this iteration variable. 1641 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(move(CopyCtorArg), 1642 Loc, 1643 move(IterationVarRef), 1644 Loc); 1645 if (CopyCtorArg.isInvalid()) 1646 return true; 1647 1648 BaseType = Array->getElementType(); 1649 } 1650 1651 // Construct the entity that we will be initializing. For an array, this 1652 // will be first element in the array, which may require several levels 1653 // of array-subscript entities. 1654 llvm::SmallVector<InitializedEntity, 4> Entities; 1655 Entities.reserve(1 + IndexVariables.size()); 1656 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1657 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1658 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1659 0, 1660 Entities.back())); 1661 1662 // Direct-initialize to use the copy constructor. 1663 InitializationKind InitKind = 1664 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1665 1666 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1667 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1668 &CopyCtorArgE, 1); 1669 1670 Sema::OwningExprResult MemberInit 1671 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1672 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArgE, 1)); 1673 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1674 if (MemberInit.isInvalid()) 1675 return true; 1676 1677 CXXMemberInit 1678 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1679 MemberInit.takeAs<Expr>(), Loc, 1680 IndexVariables.data(), 1681 IndexVariables.size()); 1682 return false; 1683 } 1684 1685 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1686 1687 QualType FieldBaseElementType = 1688 SemaRef.Context.getBaseElementType(Field->getType()); 1689 1690 if (FieldBaseElementType->isRecordType()) { 1691 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1692 InitializationKind InitKind = 1693 InitializationKind::CreateDefault(Loc); 1694 1695 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1696 Sema::OwningExprResult MemberInit = 1697 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1698 Sema::MultiExprArg(SemaRef, 0, 0)); 1699 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1700 if (MemberInit.isInvalid()) 1701 return true; 1702 1703 CXXMemberInit = 1704 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1705 Field, Loc, Loc, 1706 MemberInit.takeAs<Expr>(), 1707 Loc); 1708 return false; 1709 } 1710 1711 if (FieldBaseElementType->isReferenceType()) { 1712 SemaRef.Diag(Constructor->getLocation(), 1713 diag::err_uninitialized_member_in_ctor) 1714 << (int)Constructor->isImplicit() 1715 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1716 << 0 << Field->getDeclName(); 1717 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1718 return true; 1719 } 1720 1721 if (FieldBaseElementType.isConstQualified()) { 1722 SemaRef.Diag(Constructor->getLocation(), 1723 diag::err_uninitialized_member_in_ctor) 1724 << (int)Constructor->isImplicit() 1725 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1726 << 1 << Field->getDeclName(); 1727 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1728 return true; 1729 } 1730 1731 // Nothing to initialize. 1732 CXXMemberInit = 0; 1733 return false; 1734} 1735 1736namespace { 1737struct BaseAndFieldInfo { 1738 Sema &S; 1739 CXXConstructorDecl *Ctor; 1740 bool AnyErrorsInInits; 1741 ImplicitInitializerKind IIK; 1742 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1743 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1744 1745 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1746 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1747 // FIXME: Handle implicit move constructors. 1748 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1749 IIK = IIK_Copy; 1750 else 1751 IIK = IIK_Default; 1752 } 1753}; 1754} 1755 1756static void RecordFieldInitializer(BaseAndFieldInfo &Info, 1757 FieldDecl *Top, FieldDecl *Field, 1758 CXXBaseOrMemberInitializer *Init) { 1759 // If the member doesn't need to be initialized, Init will still be null. 1760 if (!Init) 1761 return; 1762 1763 Info.AllToInit.push_back(Init); 1764 if (Field != Top) { 1765 Init->setMember(Top); 1766 Init->setAnonUnionMember(Field); 1767 } 1768} 1769 1770static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1771 FieldDecl *Top, FieldDecl *Field) { 1772 1773 // Overwhelmingly common case: we have a direct initializer for this field. 1774 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1775 RecordFieldInitializer(Info, Top, Field, Init); 1776 return false; 1777 } 1778 1779 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1780 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1781 assert(FieldClassType && "anonymous struct/union without record type"); 1782 CXXRecordDecl *FieldClassDecl 1783 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1784 1785 // Even though union members never have non-trivial default 1786 // constructions in C++03, we still build member initializers for aggregate 1787 // record types which can be union members, and C++0x allows non-trivial 1788 // default constructors for union members, so we ensure that only one 1789 // member is initialized for these. 1790 if (FieldClassDecl->isUnion()) { 1791 // First check for an explicit initializer for one field. 1792 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1793 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1794 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1795 RecordFieldInitializer(Info, Top, *FA, Init); 1796 1797 // Once we've initialized a field of an anonymous union, the union 1798 // field in the class is also initialized, so exit immediately. 1799 return false; 1800 } 1801 } 1802 1803 // Fallthrough and construct a default initializer for the union as 1804 // a whole, which can call its default constructor if such a thing exists 1805 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1806 // behavior going forward with C++0x, when anonymous unions there are 1807 // finalized, we should revisit this. 1808 } else { 1809 // For structs, we simply descend through to initialize all members where 1810 // necessary. 1811 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1812 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1813 if (CollectFieldInitializer(Info, Top, *FA)) 1814 return true; 1815 } 1816 } 1817 } 1818 1819 // Don't try to build an implicit initializer if there were semantic 1820 // errors in any of the initializers (and therefore we might be 1821 // missing some that the user actually wrote). 1822 if (Info.AnyErrorsInInits) 1823 return false; 1824 1825 CXXBaseOrMemberInitializer *Init = 0; 1826 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1827 return true; 1828 1829 RecordFieldInitializer(Info, Top, Field, Init); 1830 return false; 1831} 1832 1833bool 1834Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1835 CXXBaseOrMemberInitializer **Initializers, 1836 unsigned NumInitializers, 1837 bool AnyErrors) { 1838 if (Constructor->getDeclContext()->isDependentContext()) { 1839 // Just store the initializers as written, they will be checked during 1840 // instantiation. 1841 if (NumInitializers > 0) { 1842 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1843 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1844 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1845 memcpy(baseOrMemberInitializers, Initializers, 1846 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1847 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1848 } 1849 1850 return false; 1851 } 1852 1853 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1854 1855 // We need to build the initializer AST according to order of construction 1856 // and not what user specified in the Initializers list. 1857 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1858 if (!ClassDecl) 1859 return true; 1860 1861 bool HadError = false; 1862 1863 for (unsigned i = 0; i < NumInitializers; i++) { 1864 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1865 1866 if (Member->isBaseInitializer()) 1867 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1868 else 1869 Info.AllBaseFields[Member->getMember()] = Member; 1870 } 1871 1872 // Keep track of the direct virtual bases. 1873 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1874 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1875 E = ClassDecl->bases_end(); I != E; ++I) { 1876 if (I->isVirtual()) 1877 DirectVBases.insert(I); 1878 } 1879 1880 // Push virtual bases before others. 1881 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1882 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1883 1884 if (CXXBaseOrMemberInitializer *Value 1885 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1886 Info.AllToInit.push_back(Value); 1887 } else if (!AnyErrors) { 1888 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1889 CXXBaseOrMemberInitializer *CXXBaseInit; 1890 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1891 VBase, IsInheritedVirtualBase, 1892 CXXBaseInit)) { 1893 HadError = true; 1894 continue; 1895 } 1896 1897 Info.AllToInit.push_back(CXXBaseInit); 1898 } 1899 } 1900 1901 // Non-virtual bases. 1902 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1903 E = ClassDecl->bases_end(); Base != E; ++Base) { 1904 // Virtuals are in the virtual base list and already constructed. 1905 if (Base->isVirtual()) 1906 continue; 1907 1908 if (CXXBaseOrMemberInitializer *Value 1909 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1910 Info.AllToInit.push_back(Value); 1911 } else if (!AnyErrors) { 1912 CXXBaseOrMemberInitializer *CXXBaseInit; 1913 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1914 Base, /*IsInheritedVirtualBase=*/false, 1915 CXXBaseInit)) { 1916 HadError = true; 1917 continue; 1918 } 1919 1920 Info.AllToInit.push_back(CXXBaseInit); 1921 } 1922 } 1923 1924 // Fields. 1925 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1926 E = ClassDecl->field_end(); Field != E; ++Field) { 1927 if ((*Field)->getType()->isIncompleteArrayType()) { 1928 assert(ClassDecl->hasFlexibleArrayMember() && 1929 "Incomplete array type is not valid"); 1930 continue; 1931 } 1932 if (CollectFieldInitializer(Info, *Field, *Field)) 1933 HadError = true; 1934 } 1935 1936 NumInitializers = Info.AllToInit.size(); 1937 if (NumInitializers > 0) { 1938 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1939 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1940 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1941 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1942 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1943 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1944 1945 // Constructors implicitly reference the base and member 1946 // destructors. 1947 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1948 Constructor->getParent()); 1949 } 1950 1951 return HadError; 1952} 1953 1954static void *GetKeyForTopLevelField(FieldDecl *Field) { 1955 // For anonymous unions, use the class declaration as the key. 1956 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1957 if (RT->getDecl()->isAnonymousStructOrUnion()) 1958 return static_cast<void *>(RT->getDecl()); 1959 } 1960 return static_cast<void *>(Field); 1961} 1962 1963static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1964 return Context.getCanonicalType(BaseType).getTypePtr(); 1965} 1966 1967static void *GetKeyForMember(ASTContext &Context, 1968 CXXBaseOrMemberInitializer *Member, 1969 bool MemberMaybeAnon = false) { 1970 if (!Member->isMemberInitializer()) 1971 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1972 1973 // For fields injected into the class via declaration of an anonymous union, 1974 // use its anonymous union class declaration as the unique key. 1975 FieldDecl *Field = Member->getMember(); 1976 1977 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1978 // data member of the class. Data member used in the initializer list is 1979 // in AnonUnionMember field. 1980 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1981 Field = Member->getAnonUnionMember(); 1982 1983 // If the field is a member of an anonymous struct or union, our key 1984 // is the anonymous record decl that's a direct child of the class. 1985 RecordDecl *RD = Field->getParent(); 1986 if (RD->isAnonymousStructOrUnion()) { 1987 while (true) { 1988 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1989 if (Parent->isAnonymousStructOrUnion()) 1990 RD = Parent; 1991 else 1992 break; 1993 } 1994 1995 return static_cast<void *>(RD); 1996 } 1997 1998 return static_cast<void *>(Field); 1999} 2000 2001static void 2002DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2003 const CXXConstructorDecl *Constructor, 2004 CXXBaseOrMemberInitializer **Inits, 2005 unsigned NumInits) { 2006 if (Constructor->getDeclContext()->isDependentContext()) 2007 return; 2008 2009 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 2010 == Diagnostic::Ignored) 2011 return; 2012 2013 // Build the list of bases and members in the order that they'll 2014 // actually be initialized. The explicit initializers should be in 2015 // this same order but may be missing things. 2016 llvm::SmallVector<const void*, 32> IdealInitKeys; 2017 2018 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2019 2020 // 1. Virtual bases. 2021 for (CXXRecordDecl::base_class_const_iterator VBase = 2022 ClassDecl->vbases_begin(), 2023 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2024 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2025 2026 // 2. Non-virtual bases. 2027 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2028 E = ClassDecl->bases_end(); Base != E; ++Base) { 2029 if (Base->isVirtual()) 2030 continue; 2031 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2032 } 2033 2034 // 3. Direct fields. 2035 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2036 E = ClassDecl->field_end(); Field != E; ++Field) 2037 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2038 2039 unsigned NumIdealInits = IdealInitKeys.size(); 2040 unsigned IdealIndex = 0; 2041 2042 CXXBaseOrMemberInitializer *PrevInit = 0; 2043 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2044 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2045 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2046 2047 // Scan forward to try to find this initializer in the idealized 2048 // initializers list. 2049 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2050 if (InitKey == IdealInitKeys[IdealIndex]) 2051 break; 2052 2053 // If we didn't find this initializer, it must be because we 2054 // scanned past it on a previous iteration. That can only 2055 // happen if we're out of order; emit a warning. 2056 if (IdealIndex == NumIdealInits && PrevInit) { 2057 Sema::SemaDiagnosticBuilder D = 2058 SemaRef.Diag(PrevInit->getSourceLocation(), 2059 diag::warn_initializer_out_of_order); 2060 2061 if (PrevInit->isMemberInitializer()) 2062 D << 0 << PrevInit->getMember()->getDeclName(); 2063 else 2064 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2065 2066 if (Init->isMemberInitializer()) 2067 D << 0 << Init->getMember()->getDeclName(); 2068 else 2069 D << 1 << Init->getBaseClassInfo()->getType(); 2070 2071 // Move back to the initializer's location in the ideal list. 2072 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2073 if (InitKey == IdealInitKeys[IdealIndex]) 2074 break; 2075 2076 assert(IdealIndex != NumIdealInits && 2077 "initializer not found in initializer list"); 2078 } 2079 2080 PrevInit = Init; 2081 } 2082} 2083 2084namespace { 2085bool CheckRedundantInit(Sema &S, 2086 CXXBaseOrMemberInitializer *Init, 2087 CXXBaseOrMemberInitializer *&PrevInit) { 2088 if (!PrevInit) { 2089 PrevInit = Init; 2090 return false; 2091 } 2092 2093 if (FieldDecl *Field = Init->getMember()) 2094 S.Diag(Init->getSourceLocation(), 2095 diag::err_multiple_mem_initialization) 2096 << Field->getDeclName() 2097 << Init->getSourceRange(); 2098 else { 2099 Type *BaseClass = Init->getBaseClass(); 2100 assert(BaseClass && "neither field nor base"); 2101 S.Diag(Init->getSourceLocation(), 2102 diag::err_multiple_base_initialization) 2103 << QualType(BaseClass, 0) 2104 << Init->getSourceRange(); 2105 } 2106 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2107 << 0 << PrevInit->getSourceRange(); 2108 2109 return true; 2110} 2111 2112typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2113typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2114 2115bool CheckRedundantUnionInit(Sema &S, 2116 CXXBaseOrMemberInitializer *Init, 2117 RedundantUnionMap &Unions) { 2118 FieldDecl *Field = Init->getMember(); 2119 RecordDecl *Parent = Field->getParent(); 2120 if (!Parent->isAnonymousStructOrUnion()) 2121 return false; 2122 2123 NamedDecl *Child = Field; 2124 do { 2125 if (Parent->isUnion()) { 2126 UnionEntry &En = Unions[Parent]; 2127 if (En.first && En.first != Child) { 2128 S.Diag(Init->getSourceLocation(), 2129 diag::err_multiple_mem_union_initialization) 2130 << Field->getDeclName() 2131 << Init->getSourceRange(); 2132 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2133 << 0 << En.second->getSourceRange(); 2134 return true; 2135 } else if (!En.first) { 2136 En.first = Child; 2137 En.second = Init; 2138 } 2139 } 2140 2141 Child = Parent; 2142 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2143 } while (Parent->isAnonymousStructOrUnion()); 2144 2145 return false; 2146} 2147} 2148 2149/// ActOnMemInitializers - Handle the member initializers for a constructor. 2150void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 2151 SourceLocation ColonLoc, 2152 MemInitTy **meminits, unsigned NumMemInits, 2153 bool AnyErrors) { 2154 if (!ConstructorDecl) 2155 return; 2156 2157 AdjustDeclIfTemplate(ConstructorDecl); 2158 2159 CXXConstructorDecl *Constructor 2160 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 2161 2162 if (!Constructor) { 2163 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2164 return; 2165 } 2166 2167 CXXBaseOrMemberInitializer **MemInits = 2168 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2169 2170 // Mapping for the duplicate initializers check. 2171 // For member initializers, this is keyed with a FieldDecl*. 2172 // For base initializers, this is keyed with a Type*. 2173 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2174 2175 // Mapping for the inconsistent anonymous-union initializers check. 2176 RedundantUnionMap MemberUnions; 2177 2178 bool HadError = false; 2179 for (unsigned i = 0; i < NumMemInits; i++) { 2180 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2181 2182 // Set the source order index. 2183 Init->setSourceOrder(i); 2184 2185 if (Init->isMemberInitializer()) { 2186 FieldDecl *Field = Init->getMember(); 2187 if (CheckRedundantInit(*this, Init, Members[Field]) || 2188 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2189 HadError = true; 2190 } else { 2191 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2192 if (CheckRedundantInit(*this, Init, Members[Key])) 2193 HadError = true; 2194 } 2195 } 2196 2197 if (HadError) 2198 return; 2199 2200 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2201 2202 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2203} 2204 2205void 2206Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2207 CXXRecordDecl *ClassDecl) { 2208 // Ignore dependent contexts. 2209 if (ClassDecl->isDependentContext()) 2210 return; 2211 2212 // FIXME: all the access-control diagnostics are positioned on the 2213 // field/base declaration. That's probably good; that said, the 2214 // user might reasonably want to know why the destructor is being 2215 // emitted, and we currently don't say. 2216 2217 // Non-static data members. 2218 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2219 E = ClassDecl->field_end(); I != E; ++I) { 2220 FieldDecl *Field = *I; 2221 if (Field->isInvalidDecl()) 2222 continue; 2223 QualType FieldType = Context.getBaseElementType(Field->getType()); 2224 2225 const RecordType* RT = FieldType->getAs<RecordType>(); 2226 if (!RT) 2227 continue; 2228 2229 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2230 if (FieldClassDecl->hasTrivialDestructor()) 2231 continue; 2232 2233 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2234 CheckDestructorAccess(Field->getLocation(), Dtor, 2235 PDiag(diag::err_access_dtor_field) 2236 << Field->getDeclName() 2237 << FieldType); 2238 2239 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2240 } 2241 2242 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2243 2244 // Bases. 2245 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2246 E = ClassDecl->bases_end(); Base != E; ++Base) { 2247 // Bases are always records in a well-formed non-dependent class. 2248 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2249 2250 // Remember direct virtual bases. 2251 if (Base->isVirtual()) 2252 DirectVirtualBases.insert(RT); 2253 2254 // Ignore trivial destructors. 2255 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2256 if (BaseClassDecl->hasTrivialDestructor()) 2257 continue; 2258 2259 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2260 2261 // FIXME: caret should be on the start of the class name 2262 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2263 PDiag(diag::err_access_dtor_base) 2264 << Base->getType() 2265 << Base->getSourceRange()); 2266 2267 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2268 } 2269 2270 // Virtual bases. 2271 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2272 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2273 2274 // Bases are always records in a well-formed non-dependent class. 2275 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2276 2277 // Ignore direct virtual bases. 2278 if (DirectVirtualBases.count(RT)) 2279 continue; 2280 2281 // Ignore trivial destructors. 2282 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2283 if (BaseClassDecl->hasTrivialDestructor()) 2284 continue; 2285 2286 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2287 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2288 PDiag(diag::err_access_dtor_vbase) 2289 << VBase->getType()); 2290 2291 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2292 } 2293} 2294 2295void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2296 if (!CDtorDecl) 2297 return; 2298 2299 if (CXXConstructorDecl *Constructor 2300 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2301 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2302} 2303 2304bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2305 unsigned DiagID, AbstractDiagSelID SelID, 2306 const CXXRecordDecl *CurrentRD) { 2307 if (SelID == -1) 2308 return RequireNonAbstractType(Loc, T, 2309 PDiag(DiagID), CurrentRD); 2310 else 2311 return RequireNonAbstractType(Loc, T, 2312 PDiag(DiagID) << SelID, CurrentRD); 2313} 2314 2315bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2316 const PartialDiagnostic &PD, 2317 const CXXRecordDecl *CurrentRD) { 2318 if (!getLangOptions().CPlusPlus) 2319 return false; 2320 2321 if (const ArrayType *AT = Context.getAsArrayType(T)) 2322 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2323 CurrentRD); 2324 2325 if (const PointerType *PT = T->getAs<PointerType>()) { 2326 // Find the innermost pointer type. 2327 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2328 PT = T; 2329 2330 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2331 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2332 } 2333 2334 const RecordType *RT = T->getAs<RecordType>(); 2335 if (!RT) 2336 return false; 2337 2338 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2339 2340 if (CurrentRD && CurrentRD != RD) 2341 return false; 2342 2343 // FIXME: is this reasonable? It matches current behavior, but.... 2344 if (!RD->getDefinition()) 2345 return false; 2346 2347 if (!RD->isAbstract()) 2348 return false; 2349 2350 Diag(Loc, PD) << RD->getDeclName(); 2351 2352 // Check if we've already emitted the list of pure virtual functions for this 2353 // class. 2354 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2355 return true; 2356 2357 CXXFinalOverriderMap FinalOverriders; 2358 RD->getFinalOverriders(FinalOverriders); 2359 2360 // Keep a set of seen pure methods so we won't diagnose the same method 2361 // more than once. 2362 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2363 2364 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2365 MEnd = FinalOverriders.end(); 2366 M != MEnd; 2367 ++M) { 2368 for (OverridingMethods::iterator SO = M->second.begin(), 2369 SOEnd = M->second.end(); 2370 SO != SOEnd; ++SO) { 2371 // C++ [class.abstract]p4: 2372 // A class is abstract if it contains or inherits at least one 2373 // pure virtual function for which the final overrider is pure 2374 // virtual. 2375 2376 // 2377 if (SO->second.size() != 1) 2378 continue; 2379 2380 if (!SO->second.front().Method->isPure()) 2381 continue; 2382 2383 if (!SeenPureMethods.insert(SO->second.front().Method)) 2384 continue; 2385 2386 Diag(SO->second.front().Method->getLocation(), 2387 diag::note_pure_virtual_function) 2388 << SO->second.front().Method->getDeclName(); 2389 } 2390 } 2391 2392 if (!PureVirtualClassDiagSet) 2393 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2394 PureVirtualClassDiagSet->insert(RD); 2395 2396 return true; 2397} 2398 2399namespace { 2400 class AbstractClassUsageDiagnoser 2401 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2402 Sema &SemaRef; 2403 CXXRecordDecl *AbstractClass; 2404 2405 bool VisitDeclContext(const DeclContext *DC) { 2406 bool Invalid = false; 2407 2408 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2409 E = DC->decls_end(); I != E; ++I) 2410 Invalid |= Visit(*I); 2411 2412 return Invalid; 2413 } 2414 2415 public: 2416 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2417 : SemaRef(SemaRef), AbstractClass(ac) { 2418 Visit(SemaRef.Context.getTranslationUnitDecl()); 2419 } 2420 2421 bool VisitFunctionDecl(const FunctionDecl *FD) { 2422 if (FD->isThisDeclarationADefinition()) { 2423 // No need to do the check if we're in a definition, because it requires 2424 // that the return/param types are complete. 2425 // because that requires 2426 return VisitDeclContext(FD); 2427 } 2428 2429 // Check the return type. 2430 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2431 bool Invalid = 2432 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2433 diag::err_abstract_type_in_decl, 2434 Sema::AbstractReturnType, 2435 AbstractClass); 2436 2437 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2438 E = FD->param_end(); I != E; ++I) { 2439 const ParmVarDecl *VD = *I; 2440 Invalid |= 2441 SemaRef.RequireNonAbstractType(VD->getLocation(), 2442 VD->getOriginalType(), 2443 diag::err_abstract_type_in_decl, 2444 Sema::AbstractParamType, 2445 AbstractClass); 2446 } 2447 2448 return Invalid; 2449 } 2450 2451 bool VisitDecl(const Decl* D) { 2452 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2453 return VisitDeclContext(DC); 2454 2455 return false; 2456 } 2457 }; 2458} 2459 2460/// \brief Perform semantic checks on a class definition that has been 2461/// completing, introducing implicitly-declared members, checking for 2462/// abstract types, etc. 2463void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2464 if (!Record || Record->isInvalidDecl()) 2465 return; 2466 2467 if (!Record->isDependentType()) 2468 AddImplicitlyDeclaredMembersToClass(Record); 2469 2470 if (Record->isInvalidDecl()) 2471 return; 2472 2473 // Set access bits correctly on the directly-declared conversions. 2474 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2475 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2476 Convs->setAccess(I, (*I)->getAccess()); 2477 2478 // Determine whether we need to check for final overriders. We do 2479 // this either when there are virtual base classes (in which case we 2480 // may end up finding multiple final overriders for a given virtual 2481 // function) or any of the base classes is abstract (in which case 2482 // we might detect that this class is abstract). 2483 bool CheckFinalOverriders = false; 2484 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2485 !Record->isDependentType()) { 2486 if (Record->getNumVBases()) 2487 CheckFinalOverriders = true; 2488 else if (!Record->isAbstract()) { 2489 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2490 BEnd = Record->bases_end(); 2491 B != BEnd; ++B) { 2492 CXXRecordDecl *BaseDecl 2493 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2494 if (BaseDecl->isAbstract()) { 2495 CheckFinalOverriders = true; 2496 break; 2497 } 2498 } 2499 } 2500 } 2501 2502 if (CheckFinalOverriders) { 2503 CXXFinalOverriderMap FinalOverriders; 2504 Record->getFinalOverriders(FinalOverriders); 2505 2506 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2507 MEnd = FinalOverriders.end(); 2508 M != MEnd; ++M) { 2509 for (OverridingMethods::iterator SO = M->second.begin(), 2510 SOEnd = M->second.end(); 2511 SO != SOEnd; ++SO) { 2512 assert(SO->second.size() > 0 && 2513 "All virtual functions have overridding virtual functions"); 2514 if (SO->second.size() == 1) { 2515 // C++ [class.abstract]p4: 2516 // A class is abstract if it contains or inherits at least one 2517 // pure virtual function for which the final overrider is pure 2518 // virtual. 2519 if (SO->second.front().Method->isPure()) 2520 Record->setAbstract(true); 2521 continue; 2522 } 2523 2524 // C++ [class.virtual]p2: 2525 // In a derived class, if a virtual member function of a base 2526 // class subobject has more than one final overrider the 2527 // program is ill-formed. 2528 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2529 << (NamedDecl *)M->first << Record; 2530 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2531 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2532 OMEnd = SO->second.end(); 2533 OM != OMEnd; ++OM) 2534 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2535 << (NamedDecl *)M->first << OM->Method->getParent(); 2536 2537 Record->setInvalidDecl(); 2538 } 2539 } 2540 } 2541 2542 if (Record->isAbstract() && !Record->isInvalidDecl()) 2543 (void)AbstractClassUsageDiagnoser(*this, Record); 2544 2545 // If this is not an aggregate type and has no user-declared constructor, 2546 // complain about any non-static data members of reference or const scalar 2547 // type, since they will never get initializers. 2548 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2549 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2550 bool Complained = false; 2551 for (RecordDecl::field_iterator F = Record->field_begin(), 2552 FEnd = Record->field_end(); 2553 F != FEnd; ++F) { 2554 if (F->getType()->isReferenceType() || 2555 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2556 if (!Complained) { 2557 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2558 << Record->getTagKind() << Record; 2559 Complained = true; 2560 } 2561 2562 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2563 << F->getType()->isReferenceType() 2564 << F->getDeclName(); 2565 } 2566 } 2567 } 2568 2569 if (Record->isDynamicClass()) 2570 DynamicClasses.push_back(Record); 2571} 2572 2573void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2574 DeclPtrTy TagDecl, 2575 SourceLocation LBrac, 2576 SourceLocation RBrac, 2577 AttributeList *AttrList) { 2578 if (!TagDecl) 2579 return; 2580 2581 AdjustDeclIfTemplate(TagDecl); 2582 2583 ActOnFields(S, RLoc, TagDecl, 2584 (DeclPtrTy*)FieldCollector->getCurFields(), 2585 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2586 2587 CheckCompletedCXXClass( 2588 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2589} 2590 2591namespace { 2592 /// \brief Helper class that collects exception specifications for 2593 /// implicitly-declared special member functions. 2594 class ImplicitExceptionSpecification { 2595 ASTContext &Context; 2596 bool AllowsAllExceptions; 2597 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2598 llvm::SmallVector<QualType, 4> Exceptions; 2599 2600 public: 2601 explicit ImplicitExceptionSpecification(ASTContext &Context) 2602 : Context(Context), AllowsAllExceptions(false) { } 2603 2604 /// \brief Whether the special member function should have any 2605 /// exception specification at all. 2606 bool hasExceptionSpecification() const { 2607 return !AllowsAllExceptions; 2608 } 2609 2610 /// \brief Whether the special member function should have a 2611 /// throw(...) exception specification (a Microsoft extension). 2612 bool hasAnyExceptionSpecification() const { 2613 return false; 2614 } 2615 2616 /// \brief The number of exceptions in the exception specification. 2617 unsigned size() const { return Exceptions.size(); } 2618 2619 /// \brief The set of exceptions in the exception specification. 2620 const QualType *data() const { return Exceptions.data(); } 2621 2622 /// \brief Note that 2623 void CalledDecl(CXXMethodDecl *Method) { 2624 // If we already know that we allow all exceptions, do nothing. 2625 if (AllowsAllExceptions || !Method) 2626 return; 2627 2628 const FunctionProtoType *Proto 2629 = Method->getType()->getAs<FunctionProtoType>(); 2630 2631 // If this function can throw any exceptions, make a note of that. 2632 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2633 AllowsAllExceptions = true; 2634 ExceptionsSeen.clear(); 2635 Exceptions.clear(); 2636 return; 2637 } 2638 2639 // Record the exceptions in this function's exception specification. 2640 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2641 EEnd = Proto->exception_end(); 2642 E != EEnd; ++E) 2643 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2644 Exceptions.push_back(*E); 2645 } 2646 }; 2647} 2648 2649 2650/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2651/// special functions, such as the default constructor, copy 2652/// constructor, or destructor, to the given C++ class (C++ 2653/// [special]p1). This routine can only be executed just before the 2654/// definition of the class is complete. 2655void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2656 if (!ClassDecl->hasUserDeclaredConstructor()) 2657 ++ASTContext::NumImplicitDefaultConstructors; 2658 2659 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2660 ++ASTContext::NumImplicitCopyConstructors; 2661 2662 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2663 ++ASTContext::NumImplicitCopyAssignmentOperators; 2664 2665 // If we have a dynamic class, then the copy assignment operator may be 2666 // virtual, so we have to declare it immediately. This ensures that, e.g., 2667 // it shows up in the right place in the vtable and that we diagnose 2668 // problems with the implicit exception specification. 2669 if (ClassDecl->isDynamicClass()) 2670 DeclareImplicitCopyAssignment(ClassDecl); 2671 } 2672 2673 if (!ClassDecl->hasUserDeclaredDestructor()) { 2674 ++ASTContext::NumImplicitDestructors; 2675 2676 // If we have a dynamic class, then the destructor may be virtual, so we 2677 // have to declare the destructor immediately. This ensures that, e.g., it 2678 // shows up in the right place in the vtable and that we diagnose problems 2679 // with the implicit exception specification. 2680 if (ClassDecl->isDynamicClass()) 2681 DeclareImplicitDestructor(ClassDecl); 2682 } 2683} 2684 2685void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2686 Decl *D = TemplateD.getAs<Decl>(); 2687 if (!D) 2688 return; 2689 2690 TemplateParameterList *Params = 0; 2691 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2692 Params = Template->getTemplateParameters(); 2693 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2694 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2695 Params = PartialSpec->getTemplateParameters(); 2696 else 2697 return; 2698 2699 for (TemplateParameterList::iterator Param = Params->begin(), 2700 ParamEnd = Params->end(); 2701 Param != ParamEnd; ++Param) { 2702 NamedDecl *Named = cast<NamedDecl>(*Param); 2703 if (Named->getDeclName()) { 2704 S->AddDecl(DeclPtrTy::make(Named)); 2705 IdResolver.AddDecl(Named); 2706 } 2707 } 2708} 2709 2710void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2711 if (!RecordD) return; 2712 AdjustDeclIfTemplate(RecordD); 2713 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2714 PushDeclContext(S, Record); 2715} 2716 2717void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2718 if (!RecordD) return; 2719 PopDeclContext(); 2720} 2721 2722/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2723/// parsing a top-level (non-nested) C++ class, and we are now 2724/// parsing those parts of the given Method declaration that could 2725/// not be parsed earlier (C++ [class.mem]p2), such as default 2726/// arguments. This action should enter the scope of the given 2727/// Method declaration as if we had just parsed the qualified method 2728/// name. However, it should not bring the parameters into scope; 2729/// that will be performed by ActOnDelayedCXXMethodParameter. 2730void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2731} 2732 2733/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2734/// C++ method declaration. We're (re-)introducing the given 2735/// function parameter into scope for use in parsing later parts of 2736/// the method declaration. For example, we could see an 2737/// ActOnParamDefaultArgument event for this parameter. 2738void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2739 if (!ParamD) 2740 return; 2741 2742 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2743 2744 // If this parameter has an unparsed default argument, clear it out 2745 // to make way for the parsed default argument. 2746 if (Param->hasUnparsedDefaultArg()) 2747 Param->setDefaultArg(0); 2748 2749 S->AddDecl(DeclPtrTy::make(Param)); 2750 if (Param->getDeclName()) 2751 IdResolver.AddDecl(Param); 2752} 2753 2754/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2755/// processing the delayed method declaration for Method. The method 2756/// declaration is now considered finished. There may be a separate 2757/// ActOnStartOfFunctionDef action later (not necessarily 2758/// immediately!) for this method, if it was also defined inside the 2759/// class body. 2760void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2761 if (!MethodD) 2762 return; 2763 2764 AdjustDeclIfTemplate(MethodD); 2765 2766 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2767 2768 // Now that we have our default arguments, check the constructor 2769 // again. It could produce additional diagnostics or affect whether 2770 // the class has implicitly-declared destructors, among other 2771 // things. 2772 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2773 CheckConstructor(Constructor); 2774 2775 // Check the default arguments, which we may have added. 2776 if (!Method->isInvalidDecl()) 2777 CheckCXXDefaultArguments(Method); 2778} 2779 2780/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2781/// the well-formedness of the constructor declarator @p D with type @p 2782/// R. If there are any errors in the declarator, this routine will 2783/// emit diagnostics and set the invalid bit to true. In any case, the type 2784/// will be updated to reflect a well-formed type for the constructor and 2785/// returned. 2786QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2787 FunctionDecl::StorageClass &SC) { 2788 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2789 2790 // C++ [class.ctor]p3: 2791 // A constructor shall not be virtual (10.3) or static (9.4). A 2792 // constructor can be invoked for a const, volatile or const 2793 // volatile object. A constructor shall not be declared const, 2794 // volatile, or const volatile (9.3.2). 2795 if (isVirtual) { 2796 if (!D.isInvalidType()) 2797 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2798 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2799 << SourceRange(D.getIdentifierLoc()); 2800 D.setInvalidType(); 2801 } 2802 if (SC == FunctionDecl::Static) { 2803 if (!D.isInvalidType()) 2804 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2805 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2806 << SourceRange(D.getIdentifierLoc()); 2807 D.setInvalidType(); 2808 SC = FunctionDecl::None; 2809 } 2810 2811 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2812 if (FTI.TypeQuals != 0) { 2813 if (FTI.TypeQuals & Qualifiers::Const) 2814 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2815 << "const" << SourceRange(D.getIdentifierLoc()); 2816 if (FTI.TypeQuals & Qualifiers::Volatile) 2817 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2818 << "volatile" << SourceRange(D.getIdentifierLoc()); 2819 if (FTI.TypeQuals & Qualifiers::Restrict) 2820 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2821 << "restrict" << SourceRange(D.getIdentifierLoc()); 2822 } 2823 2824 // Rebuild the function type "R" without any type qualifiers (in 2825 // case any of the errors above fired) and with "void" as the 2826 // return type, since constructors don't have return types. 2827 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2828 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2829 Proto->getNumArgs(), 2830 Proto->isVariadic(), 0, 2831 Proto->hasExceptionSpec(), 2832 Proto->hasAnyExceptionSpec(), 2833 Proto->getNumExceptions(), 2834 Proto->exception_begin(), 2835 Proto->getExtInfo()); 2836} 2837 2838/// CheckConstructor - Checks a fully-formed constructor for 2839/// well-formedness, issuing any diagnostics required. Returns true if 2840/// the constructor declarator is invalid. 2841void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2842 CXXRecordDecl *ClassDecl 2843 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2844 if (!ClassDecl) 2845 return Constructor->setInvalidDecl(); 2846 2847 // C++ [class.copy]p3: 2848 // A declaration of a constructor for a class X is ill-formed if 2849 // its first parameter is of type (optionally cv-qualified) X and 2850 // either there are no other parameters or else all other 2851 // parameters have default arguments. 2852 if (!Constructor->isInvalidDecl() && 2853 ((Constructor->getNumParams() == 1) || 2854 (Constructor->getNumParams() > 1 && 2855 Constructor->getParamDecl(1)->hasDefaultArg())) && 2856 Constructor->getTemplateSpecializationKind() 2857 != TSK_ImplicitInstantiation) { 2858 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2859 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2860 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2861 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2862 const char *ConstRef 2863 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2864 : " const &"; 2865 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2866 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 2867 2868 // FIXME: Rather that making the constructor invalid, we should endeavor 2869 // to fix the type. 2870 Constructor->setInvalidDecl(); 2871 } 2872 } 2873 2874 // Notify the class that we've added a constructor. In principle we 2875 // don't need to do this for out-of-line declarations; in practice 2876 // we only instantiate the most recent declaration of a method, so 2877 // we have to call this for everything but friends. 2878 if (!Constructor->getFriendObjectKind()) 2879 ClassDecl->addedConstructor(Context, Constructor); 2880} 2881 2882/// CheckDestructor - Checks a fully-formed destructor definition for 2883/// well-formedness, issuing any diagnostics required. Returns true 2884/// on error. 2885bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2886 CXXRecordDecl *RD = Destructor->getParent(); 2887 2888 if (Destructor->isVirtual()) { 2889 SourceLocation Loc; 2890 2891 if (!Destructor->isImplicit()) 2892 Loc = Destructor->getLocation(); 2893 else 2894 Loc = RD->getLocation(); 2895 2896 // If we have a virtual destructor, look up the deallocation function 2897 FunctionDecl *OperatorDelete = 0; 2898 DeclarationName Name = 2899 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2900 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2901 return true; 2902 2903 MarkDeclarationReferenced(Loc, OperatorDelete); 2904 2905 Destructor->setOperatorDelete(OperatorDelete); 2906 } 2907 2908 return false; 2909} 2910 2911static inline bool 2912FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2913 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2914 FTI.ArgInfo[0].Param && 2915 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2916} 2917 2918/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2919/// the well-formednes of the destructor declarator @p D with type @p 2920/// R. If there are any errors in the declarator, this routine will 2921/// emit diagnostics and set the declarator to invalid. Even if this happens, 2922/// will be updated to reflect a well-formed type for the destructor and 2923/// returned. 2924QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 2925 FunctionDecl::StorageClass& SC) { 2926 // C++ [class.dtor]p1: 2927 // [...] A typedef-name that names a class is a class-name 2928 // (7.1.3); however, a typedef-name that names a class shall not 2929 // be used as the identifier in the declarator for a destructor 2930 // declaration. 2931 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2932 if (isa<TypedefType>(DeclaratorType)) 2933 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2934 << DeclaratorType; 2935 2936 // C++ [class.dtor]p2: 2937 // A destructor is used to destroy objects of its class type. A 2938 // destructor takes no parameters, and no return type can be 2939 // specified for it (not even void). The address of a destructor 2940 // shall not be taken. A destructor shall not be static. A 2941 // destructor can be invoked for a const, volatile or const 2942 // volatile object. A destructor shall not be declared const, 2943 // volatile or const volatile (9.3.2). 2944 if (SC == FunctionDecl::Static) { 2945 if (!D.isInvalidType()) 2946 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2947 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2948 << SourceRange(D.getIdentifierLoc()) 2949 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2950 2951 SC = FunctionDecl::None; 2952 } 2953 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2954 // Destructors don't have return types, but the parser will 2955 // happily parse something like: 2956 // 2957 // class X { 2958 // float ~X(); 2959 // }; 2960 // 2961 // The return type will be eliminated later. 2962 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2963 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2964 << SourceRange(D.getIdentifierLoc()); 2965 } 2966 2967 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2968 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2969 if (FTI.TypeQuals & Qualifiers::Const) 2970 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2971 << "const" << SourceRange(D.getIdentifierLoc()); 2972 if (FTI.TypeQuals & Qualifiers::Volatile) 2973 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2974 << "volatile" << SourceRange(D.getIdentifierLoc()); 2975 if (FTI.TypeQuals & Qualifiers::Restrict) 2976 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2977 << "restrict" << SourceRange(D.getIdentifierLoc()); 2978 D.setInvalidType(); 2979 } 2980 2981 // Make sure we don't have any parameters. 2982 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2983 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2984 2985 // Delete the parameters. 2986 FTI.freeArgs(); 2987 D.setInvalidType(); 2988 } 2989 2990 // Make sure the destructor isn't variadic. 2991 if (FTI.isVariadic) { 2992 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2993 D.setInvalidType(); 2994 } 2995 2996 // Rebuild the function type "R" without any type qualifiers or 2997 // parameters (in case any of the errors above fired) and with 2998 // "void" as the return type, since destructors don't have return 2999 // types. 3000 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3001 if (!Proto) 3002 return QualType(); 3003 3004 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3005 Proto->hasExceptionSpec(), 3006 Proto->hasAnyExceptionSpec(), 3007 Proto->getNumExceptions(), 3008 Proto->exception_begin(), 3009 Proto->getExtInfo()); 3010} 3011 3012/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3013/// well-formednes of the conversion function declarator @p D with 3014/// type @p R. If there are any errors in the declarator, this routine 3015/// will emit diagnostics and return true. Otherwise, it will return 3016/// false. Either way, the type @p R will be updated to reflect a 3017/// well-formed type for the conversion operator. 3018void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3019 FunctionDecl::StorageClass& SC) { 3020 // C++ [class.conv.fct]p1: 3021 // Neither parameter types nor return type can be specified. The 3022 // type of a conversion function (8.3.5) is "function taking no 3023 // parameter returning conversion-type-id." 3024 if (SC == FunctionDecl::Static) { 3025 if (!D.isInvalidType()) 3026 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3027 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3028 << SourceRange(D.getIdentifierLoc()); 3029 D.setInvalidType(); 3030 SC = FunctionDecl::None; 3031 } 3032 3033 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3034 3035 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3036 // Conversion functions don't have return types, but the parser will 3037 // happily parse something like: 3038 // 3039 // class X { 3040 // float operator bool(); 3041 // }; 3042 // 3043 // The return type will be changed later anyway. 3044 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3045 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3046 << SourceRange(D.getIdentifierLoc()); 3047 D.setInvalidType(); 3048 } 3049 3050 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3051 3052 // Make sure we don't have any parameters. 3053 if (Proto->getNumArgs() > 0) { 3054 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3055 3056 // Delete the parameters. 3057 D.getTypeObject(0).Fun.freeArgs(); 3058 D.setInvalidType(); 3059 } else if (Proto->isVariadic()) { 3060 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3061 D.setInvalidType(); 3062 } 3063 3064 // Diagnose "&operator bool()" and other such nonsense. This 3065 // is actually a gcc extension which we don't support. 3066 if (Proto->getResultType() != ConvType) { 3067 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3068 << Proto->getResultType(); 3069 D.setInvalidType(); 3070 ConvType = Proto->getResultType(); 3071 } 3072 3073 // C++ [class.conv.fct]p4: 3074 // The conversion-type-id shall not represent a function type nor 3075 // an array type. 3076 if (ConvType->isArrayType()) { 3077 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3078 ConvType = Context.getPointerType(ConvType); 3079 D.setInvalidType(); 3080 } else if (ConvType->isFunctionType()) { 3081 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3082 ConvType = Context.getPointerType(ConvType); 3083 D.setInvalidType(); 3084 } 3085 3086 // Rebuild the function type "R" without any parameters (in case any 3087 // of the errors above fired) and with the conversion type as the 3088 // return type. 3089 if (D.isInvalidType()) { 3090 R = Context.getFunctionType(ConvType, 0, 0, false, 3091 Proto->getTypeQuals(), 3092 Proto->hasExceptionSpec(), 3093 Proto->hasAnyExceptionSpec(), 3094 Proto->getNumExceptions(), 3095 Proto->exception_begin(), 3096 Proto->getExtInfo()); 3097 } 3098 3099 // C++0x explicit conversion operators. 3100 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3101 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3102 diag::warn_explicit_conversion_functions) 3103 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3104} 3105 3106/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3107/// the declaration of the given C++ conversion function. This routine 3108/// is responsible for recording the conversion function in the C++ 3109/// class, if possible. 3110Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3111 assert(Conversion && "Expected to receive a conversion function declaration"); 3112 3113 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3114 3115 // Make sure we aren't redeclaring the conversion function. 3116 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3117 3118 // C++ [class.conv.fct]p1: 3119 // [...] A conversion function is never used to convert a 3120 // (possibly cv-qualified) object to the (possibly cv-qualified) 3121 // same object type (or a reference to it), to a (possibly 3122 // cv-qualified) base class of that type (or a reference to it), 3123 // or to (possibly cv-qualified) void. 3124 // FIXME: Suppress this warning if the conversion function ends up being a 3125 // virtual function that overrides a virtual function in a base class. 3126 QualType ClassType 3127 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3128 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3129 ConvType = ConvTypeRef->getPointeeType(); 3130 if (ConvType->isRecordType()) { 3131 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3132 if (ConvType == ClassType) 3133 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3134 << ClassType; 3135 else if (IsDerivedFrom(ClassType, ConvType)) 3136 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3137 << ClassType << ConvType; 3138 } else if (ConvType->isVoidType()) { 3139 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3140 << ClassType << ConvType; 3141 } 3142 3143 if (Conversion->getPrimaryTemplate()) { 3144 // ignore specializations 3145 } else if (Conversion->getPreviousDeclaration()) { 3146 if (FunctionTemplateDecl *ConversionTemplate 3147 = Conversion->getDescribedFunctionTemplate()) { 3148 if (ClassDecl->replaceConversion( 3149 ConversionTemplate->getPreviousDeclaration(), 3150 ConversionTemplate)) 3151 return DeclPtrTy::make(ConversionTemplate); 3152 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3153 Conversion)) 3154 return DeclPtrTy::make(Conversion); 3155 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3156 } else if (FunctionTemplateDecl *ConversionTemplate 3157 = Conversion->getDescribedFunctionTemplate()) 3158 ClassDecl->addConversionFunction(ConversionTemplate); 3159 else 3160 ClassDecl->addConversionFunction(Conversion); 3161 3162 return DeclPtrTy::make(Conversion); 3163} 3164 3165//===----------------------------------------------------------------------===// 3166// Namespace Handling 3167//===----------------------------------------------------------------------===// 3168 3169/// ActOnStartNamespaceDef - This is called at the start of a namespace 3170/// definition. 3171Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3172 SourceLocation IdentLoc, 3173 IdentifierInfo *II, 3174 SourceLocation LBrace, 3175 AttributeList *AttrList) { 3176 NamespaceDecl *Namespc = 3177 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3178 Namespc->setLBracLoc(LBrace); 3179 3180 Scope *DeclRegionScope = NamespcScope->getParent(); 3181 3182 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3183 3184 if (const VisibilityAttr *attr = Namespc->getAttr<VisibilityAttr>()) 3185 PushPragmaVisibility(attr->getVisibility()); 3186 3187 if (II) { 3188 // C++ [namespace.def]p2: 3189 // The identifier in an original-namespace-definition shall not have been 3190 // previously defined in the declarative region in which the 3191 // original-namespace-definition appears. The identifier in an 3192 // original-namespace-definition is the name of the namespace. Subsequently 3193 // in that declarative region, it is treated as an original-namespace-name. 3194 3195 NamedDecl *PrevDecl 3196 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3197 ForRedeclaration); 3198 3199 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3200 // This is an extended namespace definition. 3201 // Attach this namespace decl to the chain of extended namespace 3202 // definitions. 3203 OrigNS->setNextNamespace(Namespc); 3204 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3205 3206 // Remove the previous declaration from the scope. 3207 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3208 IdResolver.RemoveDecl(OrigNS); 3209 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3210 } 3211 } else if (PrevDecl) { 3212 // This is an invalid name redefinition. 3213 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3214 << Namespc->getDeclName(); 3215 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3216 Namespc->setInvalidDecl(); 3217 // Continue on to push Namespc as current DeclContext and return it. 3218 } else if (II->isStr("std") && 3219 CurContext->getLookupContext()->isTranslationUnit()) { 3220 // This is the first "real" definition of the namespace "std", so update 3221 // our cache of the "std" namespace to point at this definition. 3222 if (NamespaceDecl *StdNS = getStdNamespace()) { 3223 // We had already defined a dummy namespace "std". Link this new 3224 // namespace definition to the dummy namespace "std". 3225 StdNS->setNextNamespace(Namespc); 3226 StdNS->setLocation(IdentLoc); 3227 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3228 } 3229 3230 // Make our StdNamespace cache point at the first real definition of the 3231 // "std" namespace. 3232 StdNamespace = Namespc; 3233 } 3234 3235 PushOnScopeChains(Namespc, DeclRegionScope); 3236 } else { 3237 // Anonymous namespaces. 3238 assert(Namespc->isAnonymousNamespace()); 3239 3240 // Link the anonymous namespace into its parent. 3241 NamespaceDecl *PrevDecl; 3242 DeclContext *Parent = CurContext->getLookupContext(); 3243 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3244 PrevDecl = TU->getAnonymousNamespace(); 3245 TU->setAnonymousNamespace(Namespc); 3246 } else { 3247 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3248 PrevDecl = ND->getAnonymousNamespace(); 3249 ND->setAnonymousNamespace(Namespc); 3250 } 3251 3252 // Link the anonymous namespace with its previous declaration. 3253 if (PrevDecl) { 3254 assert(PrevDecl->isAnonymousNamespace()); 3255 assert(!PrevDecl->getNextNamespace()); 3256 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3257 PrevDecl->setNextNamespace(Namespc); 3258 } 3259 3260 CurContext->addDecl(Namespc); 3261 3262 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3263 // behaves as if it were replaced by 3264 // namespace unique { /* empty body */ } 3265 // using namespace unique; 3266 // namespace unique { namespace-body } 3267 // where all occurrences of 'unique' in a translation unit are 3268 // replaced by the same identifier and this identifier differs 3269 // from all other identifiers in the entire program. 3270 3271 // We just create the namespace with an empty name and then add an 3272 // implicit using declaration, just like the standard suggests. 3273 // 3274 // CodeGen enforces the "universally unique" aspect by giving all 3275 // declarations semantically contained within an anonymous 3276 // namespace internal linkage. 3277 3278 if (!PrevDecl) { 3279 UsingDirectiveDecl* UD 3280 = UsingDirectiveDecl::Create(Context, CurContext, 3281 /* 'using' */ LBrace, 3282 /* 'namespace' */ SourceLocation(), 3283 /* qualifier */ SourceRange(), 3284 /* NNS */ NULL, 3285 /* identifier */ SourceLocation(), 3286 Namespc, 3287 /* Ancestor */ CurContext); 3288 UD->setImplicit(); 3289 CurContext->addDecl(UD); 3290 } 3291 } 3292 3293 // Although we could have an invalid decl (i.e. the namespace name is a 3294 // redefinition), push it as current DeclContext and try to continue parsing. 3295 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3296 // for the namespace has the declarations that showed up in that particular 3297 // namespace definition. 3298 PushDeclContext(NamespcScope, Namespc); 3299 return DeclPtrTy::make(Namespc); 3300} 3301 3302/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3303/// is a namespace alias, returns the namespace it points to. 3304static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3305 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3306 return AD->getNamespace(); 3307 return dyn_cast_or_null<NamespaceDecl>(D); 3308} 3309 3310/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3311/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3312void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3313 Decl *Dcl = D.getAs<Decl>(); 3314 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3315 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3316 Namespc->setRBracLoc(RBrace); 3317 PopDeclContext(); 3318 if (Namespc->hasAttr<VisibilityAttr>()) 3319 PopPragmaVisibility(); 3320} 3321 3322/// \brief Retrieve the special "std" namespace, which may require us to 3323/// implicitly define the namespace. 3324NamespaceDecl *Sema::getOrCreateStdNamespace() { 3325 if (!StdNamespace) { 3326 // The "std" namespace has not yet been defined, so build one implicitly. 3327 StdNamespace = NamespaceDecl::Create(Context, 3328 Context.getTranslationUnitDecl(), 3329 SourceLocation(), 3330 &PP.getIdentifierTable().get("std")); 3331 getStdNamespace()->setImplicit(true); 3332 } 3333 3334 return getStdNamespace(); 3335} 3336 3337Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3338 SourceLocation UsingLoc, 3339 SourceLocation NamespcLoc, 3340 CXXScopeSpec &SS, 3341 SourceLocation IdentLoc, 3342 IdentifierInfo *NamespcName, 3343 AttributeList *AttrList) { 3344 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3345 assert(NamespcName && "Invalid NamespcName."); 3346 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3347 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3348 3349 UsingDirectiveDecl *UDir = 0; 3350 NestedNameSpecifier *Qualifier = 0; 3351 if (SS.isSet()) 3352 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3353 3354 // Lookup namespace name. 3355 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3356 LookupParsedName(R, S, &SS); 3357 if (R.isAmbiguous()) 3358 return DeclPtrTy(); 3359 3360 if (R.empty()) { 3361 // Allow "using namespace std;" or "using namespace ::std;" even if 3362 // "std" hasn't been defined yet, for GCC compatibility. 3363 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3364 NamespcName->isStr("std")) { 3365 Diag(IdentLoc, diag::ext_using_undefined_std); 3366 R.addDecl(getOrCreateStdNamespace()); 3367 R.resolveKind(); 3368 } 3369 // Otherwise, attempt typo correction. 3370 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3371 CTC_NoKeywords, 0)) { 3372 if (R.getAsSingle<NamespaceDecl>() || 3373 R.getAsSingle<NamespaceAliasDecl>()) { 3374 if (DeclContext *DC = computeDeclContext(SS, false)) 3375 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3376 << NamespcName << DC << Corrected << SS.getRange() 3377 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3378 else 3379 Diag(IdentLoc, diag::err_using_directive_suggest) 3380 << NamespcName << Corrected 3381 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3382 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3383 << Corrected; 3384 3385 NamespcName = Corrected.getAsIdentifierInfo(); 3386 } else { 3387 R.clear(); 3388 R.setLookupName(NamespcName); 3389 } 3390 } 3391 } 3392 3393 if (!R.empty()) { 3394 NamedDecl *Named = R.getFoundDecl(); 3395 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3396 && "expected namespace decl"); 3397 // C++ [namespace.udir]p1: 3398 // A using-directive specifies that the names in the nominated 3399 // namespace can be used in the scope in which the 3400 // using-directive appears after the using-directive. During 3401 // unqualified name lookup (3.4.1), the names appear as if they 3402 // were declared in the nearest enclosing namespace which 3403 // contains both the using-directive and the nominated 3404 // namespace. [Note: in this context, "contains" means "contains 3405 // directly or indirectly". ] 3406 3407 // Find enclosing context containing both using-directive and 3408 // nominated namespace. 3409 NamespaceDecl *NS = getNamespaceDecl(Named); 3410 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3411 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3412 CommonAncestor = CommonAncestor->getParent(); 3413 3414 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3415 SS.getRange(), 3416 (NestedNameSpecifier *)SS.getScopeRep(), 3417 IdentLoc, Named, CommonAncestor); 3418 PushUsingDirective(S, UDir); 3419 } else { 3420 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3421 } 3422 3423 // FIXME: We ignore attributes for now. 3424 delete AttrList; 3425 return DeclPtrTy::make(UDir); 3426} 3427 3428void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3429 // If scope has associated entity, then using directive is at namespace 3430 // or translation unit scope. We add UsingDirectiveDecls, into 3431 // it's lookup structure. 3432 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3433 Ctx->addDecl(UDir); 3434 else 3435 // Otherwise it is block-sope. using-directives will affect lookup 3436 // only to the end of scope. 3437 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3438} 3439 3440 3441Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3442 AccessSpecifier AS, 3443 bool HasUsingKeyword, 3444 SourceLocation UsingLoc, 3445 CXXScopeSpec &SS, 3446 UnqualifiedId &Name, 3447 AttributeList *AttrList, 3448 bool IsTypeName, 3449 SourceLocation TypenameLoc) { 3450 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3451 3452 switch (Name.getKind()) { 3453 case UnqualifiedId::IK_Identifier: 3454 case UnqualifiedId::IK_OperatorFunctionId: 3455 case UnqualifiedId::IK_LiteralOperatorId: 3456 case UnqualifiedId::IK_ConversionFunctionId: 3457 break; 3458 3459 case UnqualifiedId::IK_ConstructorName: 3460 case UnqualifiedId::IK_ConstructorTemplateId: 3461 // C++0x inherited constructors. 3462 if (getLangOptions().CPlusPlus0x) break; 3463 3464 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3465 << SS.getRange(); 3466 return DeclPtrTy(); 3467 3468 case UnqualifiedId::IK_DestructorName: 3469 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3470 << SS.getRange(); 3471 return DeclPtrTy(); 3472 3473 case UnqualifiedId::IK_TemplateId: 3474 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3475 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3476 return DeclPtrTy(); 3477 } 3478 3479 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3480 if (!TargetName) 3481 return DeclPtrTy(); 3482 3483 // Warn about using declarations. 3484 // TODO: store that the declaration was written without 'using' and 3485 // talk about access decls instead of using decls in the 3486 // diagnostics. 3487 if (!HasUsingKeyword) { 3488 UsingLoc = Name.getSourceRange().getBegin(); 3489 3490 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3491 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3492 } 3493 3494 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3495 Name.getSourceRange().getBegin(), 3496 TargetName, AttrList, 3497 /* IsInstantiation */ false, 3498 IsTypeName, TypenameLoc); 3499 if (UD) 3500 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3501 3502 return DeclPtrTy::make(UD); 3503} 3504 3505/// \brief Determine whether a using declaration considers the given 3506/// declarations as "equivalent", e.g., if they are redeclarations of 3507/// the same entity or are both typedefs of the same type. 3508static bool 3509IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3510 bool &SuppressRedeclaration) { 3511 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3512 SuppressRedeclaration = false; 3513 return true; 3514 } 3515 3516 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3517 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3518 SuppressRedeclaration = true; 3519 return Context.hasSameType(TD1->getUnderlyingType(), 3520 TD2->getUnderlyingType()); 3521 } 3522 3523 return false; 3524} 3525 3526 3527/// Determines whether to create a using shadow decl for a particular 3528/// decl, given the set of decls existing prior to this using lookup. 3529bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3530 const LookupResult &Previous) { 3531 // Diagnose finding a decl which is not from a base class of the 3532 // current class. We do this now because there are cases where this 3533 // function will silently decide not to build a shadow decl, which 3534 // will pre-empt further diagnostics. 3535 // 3536 // We don't need to do this in C++0x because we do the check once on 3537 // the qualifier. 3538 // 3539 // FIXME: diagnose the following if we care enough: 3540 // struct A { int foo; }; 3541 // struct B : A { using A::foo; }; 3542 // template <class T> struct C : A {}; 3543 // template <class T> struct D : C<T> { using B::foo; } // <--- 3544 // This is invalid (during instantiation) in C++03 because B::foo 3545 // resolves to the using decl in B, which is not a base class of D<T>. 3546 // We can't diagnose it immediately because C<T> is an unknown 3547 // specialization. The UsingShadowDecl in D<T> then points directly 3548 // to A::foo, which will look well-formed when we instantiate. 3549 // The right solution is to not collapse the shadow-decl chain. 3550 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3551 DeclContext *OrigDC = Orig->getDeclContext(); 3552 3553 // Handle enums and anonymous structs. 3554 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3555 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3556 while (OrigRec->isAnonymousStructOrUnion()) 3557 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3558 3559 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3560 if (OrigDC == CurContext) { 3561 Diag(Using->getLocation(), 3562 diag::err_using_decl_nested_name_specifier_is_current_class) 3563 << Using->getNestedNameRange(); 3564 Diag(Orig->getLocation(), diag::note_using_decl_target); 3565 return true; 3566 } 3567 3568 Diag(Using->getNestedNameRange().getBegin(), 3569 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3570 << Using->getTargetNestedNameDecl() 3571 << cast<CXXRecordDecl>(CurContext) 3572 << Using->getNestedNameRange(); 3573 Diag(Orig->getLocation(), diag::note_using_decl_target); 3574 return true; 3575 } 3576 } 3577 3578 if (Previous.empty()) return false; 3579 3580 NamedDecl *Target = Orig; 3581 if (isa<UsingShadowDecl>(Target)) 3582 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3583 3584 // If the target happens to be one of the previous declarations, we 3585 // don't have a conflict. 3586 // 3587 // FIXME: but we might be increasing its access, in which case we 3588 // should redeclare it. 3589 NamedDecl *NonTag = 0, *Tag = 0; 3590 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3591 I != E; ++I) { 3592 NamedDecl *D = (*I)->getUnderlyingDecl(); 3593 bool Result; 3594 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3595 return Result; 3596 3597 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3598 } 3599 3600 if (Target->isFunctionOrFunctionTemplate()) { 3601 FunctionDecl *FD; 3602 if (isa<FunctionTemplateDecl>(Target)) 3603 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3604 else 3605 FD = cast<FunctionDecl>(Target); 3606 3607 NamedDecl *OldDecl = 0; 3608 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3609 case Ovl_Overload: 3610 return false; 3611 3612 case Ovl_NonFunction: 3613 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3614 break; 3615 3616 // We found a decl with the exact signature. 3617 case Ovl_Match: 3618 // If we're in a record, we want to hide the target, so we 3619 // return true (without a diagnostic) to tell the caller not to 3620 // build a shadow decl. 3621 if (CurContext->isRecord()) 3622 return true; 3623 3624 // If we're not in a record, this is an error. 3625 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3626 break; 3627 } 3628 3629 Diag(Target->getLocation(), diag::note_using_decl_target); 3630 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3631 return true; 3632 } 3633 3634 // Target is not a function. 3635 3636 if (isa<TagDecl>(Target)) { 3637 // No conflict between a tag and a non-tag. 3638 if (!Tag) return false; 3639 3640 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3641 Diag(Target->getLocation(), diag::note_using_decl_target); 3642 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3643 return true; 3644 } 3645 3646 // No conflict between a tag and a non-tag. 3647 if (!NonTag) return false; 3648 3649 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3650 Diag(Target->getLocation(), diag::note_using_decl_target); 3651 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3652 return true; 3653} 3654 3655/// Builds a shadow declaration corresponding to a 'using' declaration. 3656UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3657 UsingDecl *UD, 3658 NamedDecl *Orig) { 3659 3660 // If we resolved to another shadow declaration, just coalesce them. 3661 NamedDecl *Target = Orig; 3662 if (isa<UsingShadowDecl>(Target)) { 3663 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3664 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3665 } 3666 3667 UsingShadowDecl *Shadow 3668 = UsingShadowDecl::Create(Context, CurContext, 3669 UD->getLocation(), UD, Target); 3670 UD->addShadowDecl(Shadow); 3671 3672 if (S) 3673 PushOnScopeChains(Shadow, S); 3674 else 3675 CurContext->addDecl(Shadow); 3676 Shadow->setAccess(UD->getAccess()); 3677 3678 // Register it as a conversion if appropriate. 3679 if (Shadow->getDeclName().getNameKind() 3680 == DeclarationName::CXXConversionFunctionName) 3681 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3682 3683 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3684 Shadow->setInvalidDecl(); 3685 3686 return Shadow; 3687} 3688 3689/// Hides a using shadow declaration. This is required by the current 3690/// using-decl implementation when a resolvable using declaration in a 3691/// class is followed by a declaration which would hide or override 3692/// one or more of the using decl's targets; for example: 3693/// 3694/// struct Base { void foo(int); }; 3695/// struct Derived : Base { 3696/// using Base::foo; 3697/// void foo(int); 3698/// }; 3699/// 3700/// The governing language is C++03 [namespace.udecl]p12: 3701/// 3702/// When a using-declaration brings names from a base class into a 3703/// derived class scope, member functions in the derived class 3704/// override and/or hide member functions with the same name and 3705/// parameter types in a base class (rather than conflicting). 3706/// 3707/// There are two ways to implement this: 3708/// (1) optimistically create shadow decls when they're not hidden 3709/// by existing declarations, or 3710/// (2) don't create any shadow decls (or at least don't make them 3711/// visible) until we've fully parsed/instantiated the class. 3712/// The problem with (1) is that we might have to retroactively remove 3713/// a shadow decl, which requires several O(n) operations because the 3714/// decl structures are (very reasonably) not designed for removal. 3715/// (2) avoids this but is very fiddly and phase-dependent. 3716void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3717 if (Shadow->getDeclName().getNameKind() == 3718 DeclarationName::CXXConversionFunctionName) 3719 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3720 3721 // Remove it from the DeclContext... 3722 Shadow->getDeclContext()->removeDecl(Shadow); 3723 3724 // ...and the scope, if applicable... 3725 if (S) { 3726 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3727 IdResolver.RemoveDecl(Shadow); 3728 } 3729 3730 // ...and the using decl. 3731 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3732 3733 // TODO: complain somehow if Shadow was used. It shouldn't 3734 // be possible for this to happen, because...? 3735} 3736 3737/// Builds a using declaration. 3738/// 3739/// \param IsInstantiation - Whether this call arises from an 3740/// instantiation of an unresolved using declaration. We treat 3741/// the lookup differently for these declarations. 3742NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3743 SourceLocation UsingLoc, 3744 CXXScopeSpec &SS, 3745 SourceLocation IdentLoc, 3746 DeclarationName Name, 3747 AttributeList *AttrList, 3748 bool IsInstantiation, 3749 bool IsTypeName, 3750 SourceLocation TypenameLoc) { 3751 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3752 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3753 3754 // FIXME: We ignore attributes for now. 3755 delete AttrList; 3756 3757 if (SS.isEmpty()) { 3758 Diag(IdentLoc, diag::err_using_requires_qualname); 3759 return 0; 3760 } 3761 3762 // Do the redeclaration lookup in the current scope. 3763 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3764 ForRedeclaration); 3765 Previous.setHideTags(false); 3766 if (S) { 3767 LookupName(Previous, S); 3768 3769 // It is really dumb that we have to do this. 3770 LookupResult::Filter F = Previous.makeFilter(); 3771 while (F.hasNext()) { 3772 NamedDecl *D = F.next(); 3773 if (!isDeclInScope(D, CurContext, S)) 3774 F.erase(); 3775 } 3776 F.done(); 3777 } else { 3778 assert(IsInstantiation && "no scope in non-instantiation"); 3779 assert(CurContext->isRecord() && "scope not record in instantiation"); 3780 LookupQualifiedName(Previous, CurContext); 3781 } 3782 3783 NestedNameSpecifier *NNS = 3784 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3785 3786 // Check for invalid redeclarations. 3787 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3788 return 0; 3789 3790 // Check for bad qualifiers. 3791 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3792 return 0; 3793 3794 DeclContext *LookupContext = computeDeclContext(SS); 3795 NamedDecl *D; 3796 if (!LookupContext) { 3797 if (IsTypeName) { 3798 // FIXME: not all declaration name kinds are legal here 3799 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3800 UsingLoc, TypenameLoc, 3801 SS.getRange(), NNS, 3802 IdentLoc, Name); 3803 } else { 3804 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3805 UsingLoc, SS.getRange(), NNS, 3806 IdentLoc, Name); 3807 } 3808 } else { 3809 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3810 SS.getRange(), UsingLoc, NNS, Name, 3811 IsTypeName); 3812 } 3813 D->setAccess(AS); 3814 CurContext->addDecl(D); 3815 3816 if (!LookupContext) return D; 3817 UsingDecl *UD = cast<UsingDecl>(D); 3818 3819 if (RequireCompleteDeclContext(SS, LookupContext)) { 3820 UD->setInvalidDecl(); 3821 return UD; 3822 } 3823 3824 // Look up the target name. 3825 3826 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3827 3828 // Unlike most lookups, we don't always want to hide tag 3829 // declarations: tag names are visible through the using declaration 3830 // even if hidden by ordinary names, *except* in a dependent context 3831 // where it's important for the sanity of two-phase lookup. 3832 if (!IsInstantiation) 3833 R.setHideTags(false); 3834 3835 LookupQualifiedName(R, LookupContext); 3836 3837 if (R.empty()) { 3838 Diag(IdentLoc, diag::err_no_member) 3839 << Name << LookupContext << SS.getRange(); 3840 UD->setInvalidDecl(); 3841 return UD; 3842 } 3843 3844 if (R.isAmbiguous()) { 3845 UD->setInvalidDecl(); 3846 return UD; 3847 } 3848 3849 if (IsTypeName) { 3850 // If we asked for a typename and got a non-type decl, error out. 3851 if (!R.getAsSingle<TypeDecl>()) { 3852 Diag(IdentLoc, diag::err_using_typename_non_type); 3853 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3854 Diag((*I)->getUnderlyingDecl()->getLocation(), 3855 diag::note_using_decl_target); 3856 UD->setInvalidDecl(); 3857 return UD; 3858 } 3859 } else { 3860 // If we asked for a non-typename and we got a type, error out, 3861 // but only if this is an instantiation of an unresolved using 3862 // decl. Otherwise just silently find the type name. 3863 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3864 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3865 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3866 UD->setInvalidDecl(); 3867 return UD; 3868 } 3869 } 3870 3871 // C++0x N2914 [namespace.udecl]p6: 3872 // A using-declaration shall not name a namespace. 3873 if (R.getAsSingle<NamespaceDecl>()) { 3874 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3875 << SS.getRange(); 3876 UD->setInvalidDecl(); 3877 return UD; 3878 } 3879 3880 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3881 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3882 BuildUsingShadowDecl(S, UD, *I); 3883 } 3884 3885 return UD; 3886} 3887 3888/// Checks that the given using declaration is not an invalid 3889/// redeclaration. Note that this is checking only for the using decl 3890/// itself, not for any ill-formedness among the UsingShadowDecls. 3891bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3892 bool isTypeName, 3893 const CXXScopeSpec &SS, 3894 SourceLocation NameLoc, 3895 const LookupResult &Prev) { 3896 // C++03 [namespace.udecl]p8: 3897 // C++0x [namespace.udecl]p10: 3898 // A using-declaration is a declaration and can therefore be used 3899 // repeatedly where (and only where) multiple declarations are 3900 // allowed. 3901 // 3902 // That's in non-member contexts. 3903 if (!CurContext->getLookupContext()->isRecord()) 3904 return false; 3905 3906 NestedNameSpecifier *Qual 3907 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3908 3909 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3910 NamedDecl *D = *I; 3911 3912 bool DTypename; 3913 NestedNameSpecifier *DQual; 3914 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3915 DTypename = UD->isTypeName(); 3916 DQual = UD->getTargetNestedNameDecl(); 3917 } else if (UnresolvedUsingValueDecl *UD 3918 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3919 DTypename = false; 3920 DQual = UD->getTargetNestedNameSpecifier(); 3921 } else if (UnresolvedUsingTypenameDecl *UD 3922 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3923 DTypename = true; 3924 DQual = UD->getTargetNestedNameSpecifier(); 3925 } else continue; 3926 3927 // using decls differ if one says 'typename' and the other doesn't. 3928 // FIXME: non-dependent using decls? 3929 if (isTypeName != DTypename) continue; 3930 3931 // using decls differ if they name different scopes (but note that 3932 // template instantiation can cause this check to trigger when it 3933 // didn't before instantiation). 3934 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3935 Context.getCanonicalNestedNameSpecifier(DQual)) 3936 continue; 3937 3938 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3939 Diag(D->getLocation(), diag::note_using_decl) << 1; 3940 return true; 3941 } 3942 3943 return false; 3944} 3945 3946 3947/// Checks that the given nested-name qualifier used in a using decl 3948/// in the current context is appropriately related to the current 3949/// scope. If an error is found, diagnoses it and returns true. 3950bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3951 const CXXScopeSpec &SS, 3952 SourceLocation NameLoc) { 3953 DeclContext *NamedContext = computeDeclContext(SS); 3954 3955 if (!CurContext->isRecord()) { 3956 // C++03 [namespace.udecl]p3: 3957 // C++0x [namespace.udecl]p8: 3958 // A using-declaration for a class member shall be a member-declaration. 3959 3960 // If we weren't able to compute a valid scope, it must be a 3961 // dependent class scope. 3962 if (!NamedContext || NamedContext->isRecord()) { 3963 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3964 << SS.getRange(); 3965 return true; 3966 } 3967 3968 // Otherwise, everything is known to be fine. 3969 return false; 3970 } 3971 3972 // The current scope is a record. 3973 3974 // If the named context is dependent, we can't decide much. 3975 if (!NamedContext) { 3976 // FIXME: in C++0x, we can diagnose if we can prove that the 3977 // nested-name-specifier does not refer to a base class, which is 3978 // still possible in some cases. 3979 3980 // Otherwise we have to conservatively report that things might be 3981 // okay. 3982 return false; 3983 } 3984 3985 if (!NamedContext->isRecord()) { 3986 // Ideally this would point at the last name in the specifier, 3987 // but we don't have that level of source info. 3988 Diag(SS.getRange().getBegin(), 3989 diag::err_using_decl_nested_name_specifier_is_not_class) 3990 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3991 return true; 3992 } 3993 3994 if (getLangOptions().CPlusPlus0x) { 3995 // C++0x [namespace.udecl]p3: 3996 // In a using-declaration used as a member-declaration, the 3997 // nested-name-specifier shall name a base class of the class 3998 // being defined. 3999 4000 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4001 cast<CXXRecordDecl>(NamedContext))) { 4002 if (CurContext == NamedContext) { 4003 Diag(NameLoc, 4004 diag::err_using_decl_nested_name_specifier_is_current_class) 4005 << SS.getRange(); 4006 return true; 4007 } 4008 4009 Diag(SS.getRange().getBegin(), 4010 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4011 << (NestedNameSpecifier*) SS.getScopeRep() 4012 << cast<CXXRecordDecl>(CurContext) 4013 << SS.getRange(); 4014 return true; 4015 } 4016 4017 return false; 4018 } 4019 4020 // C++03 [namespace.udecl]p4: 4021 // A using-declaration used as a member-declaration shall refer 4022 // to a member of a base class of the class being defined [etc.]. 4023 4024 // Salient point: SS doesn't have to name a base class as long as 4025 // lookup only finds members from base classes. Therefore we can 4026 // diagnose here only if we can prove that that can't happen, 4027 // i.e. if the class hierarchies provably don't intersect. 4028 4029 // TODO: it would be nice if "definitely valid" results were cached 4030 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4031 // need to be repeated. 4032 4033 struct UserData { 4034 llvm::DenseSet<const CXXRecordDecl*> Bases; 4035 4036 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4037 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4038 Data->Bases.insert(Base); 4039 return true; 4040 } 4041 4042 bool hasDependentBases(const CXXRecordDecl *Class) { 4043 return !Class->forallBases(collect, this); 4044 } 4045 4046 /// Returns true if the base is dependent or is one of the 4047 /// accumulated base classes. 4048 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4049 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4050 return !Data->Bases.count(Base); 4051 } 4052 4053 bool mightShareBases(const CXXRecordDecl *Class) { 4054 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4055 } 4056 }; 4057 4058 UserData Data; 4059 4060 // Returns false if we find a dependent base. 4061 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4062 return false; 4063 4064 // Returns false if the class has a dependent base or if it or one 4065 // of its bases is present in the base set of the current context. 4066 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4067 return false; 4068 4069 Diag(SS.getRange().getBegin(), 4070 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4071 << (NestedNameSpecifier*) SS.getScopeRep() 4072 << cast<CXXRecordDecl>(CurContext) 4073 << SS.getRange(); 4074 4075 return true; 4076} 4077 4078Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 4079 SourceLocation NamespaceLoc, 4080 SourceLocation AliasLoc, 4081 IdentifierInfo *Alias, 4082 CXXScopeSpec &SS, 4083 SourceLocation IdentLoc, 4084 IdentifierInfo *Ident) { 4085 4086 // Lookup the namespace name. 4087 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4088 LookupParsedName(R, S, &SS); 4089 4090 // Check if we have a previous declaration with the same name. 4091 NamedDecl *PrevDecl 4092 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4093 ForRedeclaration); 4094 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4095 PrevDecl = 0; 4096 4097 if (PrevDecl) { 4098 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4099 // We already have an alias with the same name that points to the same 4100 // namespace, so don't create a new one. 4101 // FIXME: At some point, we'll want to create the (redundant) 4102 // declaration to maintain better source information. 4103 if (!R.isAmbiguous() && !R.empty() && 4104 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4105 return DeclPtrTy(); 4106 } 4107 4108 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4109 diag::err_redefinition_different_kind; 4110 Diag(AliasLoc, DiagID) << Alias; 4111 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4112 return DeclPtrTy(); 4113 } 4114 4115 if (R.isAmbiguous()) 4116 return DeclPtrTy(); 4117 4118 if (R.empty()) { 4119 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4120 CTC_NoKeywords, 0)) { 4121 if (R.getAsSingle<NamespaceDecl>() || 4122 R.getAsSingle<NamespaceAliasDecl>()) { 4123 if (DeclContext *DC = computeDeclContext(SS, false)) 4124 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4125 << Ident << DC << Corrected << SS.getRange() 4126 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4127 else 4128 Diag(IdentLoc, diag::err_using_directive_suggest) 4129 << Ident << Corrected 4130 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4131 4132 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4133 << Corrected; 4134 4135 Ident = Corrected.getAsIdentifierInfo(); 4136 } else { 4137 R.clear(); 4138 R.setLookupName(Ident); 4139 } 4140 } 4141 4142 if (R.empty()) { 4143 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4144 return DeclPtrTy(); 4145 } 4146 } 4147 4148 NamespaceAliasDecl *AliasDecl = 4149 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4150 Alias, SS.getRange(), 4151 (NestedNameSpecifier *)SS.getScopeRep(), 4152 IdentLoc, R.getFoundDecl()); 4153 4154 PushOnScopeChains(AliasDecl, S); 4155 return DeclPtrTy::make(AliasDecl); 4156} 4157 4158namespace { 4159 /// \brief Scoped object used to handle the state changes required in Sema 4160 /// to implicitly define the body of a C++ member function; 4161 class ImplicitlyDefinedFunctionScope { 4162 Sema &S; 4163 DeclContext *PreviousContext; 4164 4165 public: 4166 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4167 : S(S), PreviousContext(S.CurContext) 4168 { 4169 S.CurContext = Method; 4170 S.PushFunctionScope(); 4171 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4172 } 4173 4174 ~ImplicitlyDefinedFunctionScope() { 4175 S.PopExpressionEvaluationContext(); 4176 S.PopFunctionOrBlockScope(); 4177 S.CurContext = PreviousContext; 4178 } 4179 }; 4180} 4181 4182CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4183 CXXRecordDecl *ClassDecl) { 4184 // C++ [class.ctor]p5: 4185 // A default constructor for a class X is a constructor of class X 4186 // that can be called without an argument. If there is no 4187 // user-declared constructor for class X, a default constructor is 4188 // implicitly declared. An implicitly-declared default constructor 4189 // is an inline public member of its class. 4190 assert(!ClassDecl->hasUserDeclaredConstructor() && 4191 "Should not build implicit default constructor!"); 4192 4193 // C++ [except.spec]p14: 4194 // An implicitly declared special member function (Clause 12) shall have an 4195 // exception-specification. [...] 4196 ImplicitExceptionSpecification ExceptSpec(Context); 4197 4198 // Direct base-class destructors. 4199 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4200 BEnd = ClassDecl->bases_end(); 4201 B != BEnd; ++B) { 4202 if (B->isVirtual()) // Handled below. 4203 continue; 4204 4205 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4206 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4207 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4208 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4209 else if (CXXConstructorDecl *Constructor 4210 = BaseClassDecl->getDefaultConstructor()) 4211 ExceptSpec.CalledDecl(Constructor); 4212 } 4213 } 4214 4215 // Virtual base-class destructors. 4216 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4217 BEnd = ClassDecl->vbases_end(); 4218 B != BEnd; ++B) { 4219 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4220 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4221 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4222 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4223 else if (CXXConstructorDecl *Constructor 4224 = BaseClassDecl->getDefaultConstructor()) 4225 ExceptSpec.CalledDecl(Constructor); 4226 } 4227 } 4228 4229 // Field destructors. 4230 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4231 FEnd = ClassDecl->field_end(); 4232 F != FEnd; ++F) { 4233 if (const RecordType *RecordTy 4234 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4235 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4236 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4237 ExceptSpec.CalledDecl( 4238 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4239 else if (CXXConstructorDecl *Constructor 4240 = FieldClassDecl->getDefaultConstructor()) 4241 ExceptSpec.CalledDecl(Constructor); 4242 } 4243 } 4244 4245 4246 // Create the actual constructor declaration. 4247 CanQualType ClassType 4248 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4249 DeclarationName Name 4250 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4251 CXXConstructorDecl *DefaultCon 4252 = CXXConstructorDecl::Create(Context, ClassDecl, 4253 ClassDecl->getLocation(), Name, 4254 Context.getFunctionType(Context.VoidTy, 4255 0, 0, false, 0, 4256 ExceptSpec.hasExceptionSpecification(), 4257 ExceptSpec.hasAnyExceptionSpecification(), 4258 ExceptSpec.size(), 4259 ExceptSpec.data(), 4260 FunctionType::ExtInfo()), 4261 /*TInfo=*/0, 4262 /*isExplicit=*/false, 4263 /*isInline=*/true, 4264 /*isImplicitlyDeclared=*/true); 4265 DefaultCon->setAccess(AS_public); 4266 DefaultCon->setImplicit(); 4267 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4268 4269 // Note that we have declared this constructor. 4270 ClassDecl->setDeclaredDefaultConstructor(true); 4271 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4272 4273 if (Scope *S = getScopeForContext(ClassDecl)) 4274 PushOnScopeChains(DefaultCon, S, false); 4275 ClassDecl->addDecl(DefaultCon); 4276 4277 return DefaultCon; 4278} 4279 4280void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4281 CXXConstructorDecl *Constructor) { 4282 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4283 !Constructor->isUsed(false)) && 4284 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4285 4286 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4287 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4288 4289 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4290 ErrorTrap Trap(*this); 4291 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4292 Trap.hasErrorOccurred()) { 4293 Diag(CurrentLocation, diag::note_member_synthesized_at) 4294 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4295 Constructor->setInvalidDecl(); 4296 } else { 4297 Constructor->setUsed(); 4298 MarkVTableUsed(CurrentLocation, ClassDecl); 4299 } 4300} 4301 4302CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4303 // C++ [class.dtor]p2: 4304 // If a class has no user-declared destructor, a destructor is 4305 // declared implicitly. An implicitly-declared destructor is an 4306 // inline public member of its class. 4307 4308 // C++ [except.spec]p14: 4309 // An implicitly declared special member function (Clause 12) shall have 4310 // an exception-specification. 4311 ImplicitExceptionSpecification ExceptSpec(Context); 4312 4313 // Direct base-class destructors. 4314 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4315 BEnd = ClassDecl->bases_end(); 4316 B != BEnd; ++B) { 4317 if (B->isVirtual()) // Handled below. 4318 continue; 4319 4320 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4321 ExceptSpec.CalledDecl( 4322 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4323 } 4324 4325 // Virtual base-class destructors. 4326 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4327 BEnd = ClassDecl->vbases_end(); 4328 B != BEnd; ++B) { 4329 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4330 ExceptSpec.CalledDecl( 4331 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4332 } 4333 4334 // Field destructors. 4335 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4336 FEnd = ClassDecl->field_end(); 4337 F != FEnd; ++F) { 4338 if (const RecordType *RecordTy 4339 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4340 ExceptSpec.CalledDecl( 4341 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4342 } 4343 4344 // Create the actual destructor declaration. 4345 QualType Ty = Context.getFunctionType(Context.VoidTy, 4346 0, 0, false, 0, 4347 ExceptSpec.hasExceptionSpecification(), 4348 ExceptSpec.hasAnyExceptionSpecification(), 4349 ExceptSpec.size(), 4350 ExceptSpec.data(), 4351 FunctionType::ExtInfo()); 4352 4353 CanQualType ClassType 4354 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4355 DeclarationName Name 4356 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4357 CXXDestructorDecl *Destructor 4358 = CXXDestructorDecl::Create(Context, ClassDecl, 4359 ClassDecl->getLocation(), Name, Ty, 4360 /*isInline=*/true, 4361 /*isImplicitlyDeclared=*/true); 4362 Destructor->setAccess(AS_public); 4363 Destructor->setImplicit(); 4364 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4365 4366 // Note that we have declared this destructor. 4367 ClassDecl->setDeclaredDestructor(true); 4368 ++ASTContext::NumImplicitDestructorsDeclared; 4369 4370 // Introduce this destructor into its scope. 4371 if (Scope *S = getScopeForContext(ClassDecl)) 4372 PushOnScopeChains(Destructor, S, false); 4373 ClassDecl->addDecl(Destructor); 4374 4375 // This could be uniqued if it ever proves significant. 4376 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4377 4378 AddOverriddenMethods(ClassDecl, Destructor); 4379 4380 return Destructor; 4381} 4382 4383void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4384 CXXDestructorDecl *Destructor) { 4385 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4386 "DefineImplicitDestructor - call it for implicit default dtor"); 4387 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4388 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4389 4390 if (Destructor->isInvalidDecl()) 4391 return; 4392 4393 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4394 4395 ErrorTrap Trap(*this); 4396 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4397 Destructor->getParent()); 4398 4399 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4400 Diag(CurrentLocation, diag::note_member_synthesized_at) 4401 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4402 4403 Destructor->setInvalidDecl(); 4404 return; 4405 } 4406 4407 Destructor->setUsed(); 4408 MarkVTableUsed(CurrentLocation, ClassDecl); 4409} 4410 4411/// \brief Builds a statement that copies the given entity from \p From to 4412/// \c To. 4413/// 4414/// This routine is used to copy the members of a class with an 4415/// implicitly-declared copy assignment operator. When the entities being 4416/// copied are arrays, this routine builds for loops to copy them. 4417/// 4418/// \param S The Sema object used for type-checking. 4419/// 4420/// \param Loc The location where the implicit copy is being generated. 4421/// 4422/// \param T The type of the expressions being copied. Both expressions must 4423/// have this type. 4424/// 4425/// \param To The expression we are copying to. 4426/// 4427/// \param From The expression we are copying from. 4428/// 4429/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4430/// Otherwise, it's a non-static member subobject. 4431/// 4432/// \param Depth Internal parameter recording the depth of the recursion. 4433/// 4434/// \returns A statement or a loop that copies the expressions. 4435static Sema::OwningStmtResult 4436BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4437 Sema::OwningExprResult To, Sema::OwningExprResult From, 4438 bool CopyingBaseSubobject, unsigned Depth = 0) { 4439 typedef Sema::OwningStmtResult OwningStmtResult; 4440 typedef Sema::OwningExprResult OwningExprResult; 4441 4442 // C++0x [class.copy]p30: 4443 // Each subobject is assigned in the manner appropriate to its type: 4444 // 4445 // - if the subobject is of class type, the copy assignment operator 4446 // for the class is used (as if by explicit qualification; that is, 4447 // ignoring any possible virtual overriding functions in more derived 4448 // classes); 4449 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4450 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4451 4452 // Look for operator=. 4453 DeclarationName Name 4454 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4455 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4456 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4457 4458 // Filter out any result that isn't a copy-assignment operator. 4459 LookupResult::Filter F = OpLookup.makeFilter(); 4460 while (F.hasNext()) { 4461 NamedDecl *D = F.next(); 4462 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4463 if (Method->isCopyAssignmentOperator()) 4464 continue; 4465 4466 F.erase(); 4467 } 4468 F.done(); 4469 4470 // Suppress the protected check (C++ [class.protected]) for each of the 4471 // assignment operators we found. This strange dance is required when 4472 // we're assigning via a base classes's copy-assignment operator. To 4473 // ensure that we're getting the right base class subobject (without 4474 // ambiguities), we need to cast "this" to that subobject type; to 4475 // ensure that we don't go through the virtual call mechanism, we need 4476 // to qualify the operator= name with the base class (see below). However, 4477 // this means that if the base class has a protected copy assignment 4478 // operator, the protected member access check will fail. So, we 4479 // rewrite "protected" access to "public" access in this case, since we 4480 // know by construction that we're calling from a derived class. 4481 if (CopyingBaseSubobject) { 4482 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4483 L != LEnd; ++L) { 4484 if (L.getAccess() == AS_protected) 4485 L.setAccess(AS_public); 4486 } 4487 } 4488 4489 // Create the nested-name-specifier that will be used to qualify the 4490 // reference to operator=; this is required to suppress the virtual 4491 // call mechanism. 4492 CXXScopeSpec SS; 4493 SS.setRange(Loc); 4494 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4495 T.getTypePtr())); 4496 4497 // Create the reference to operator=. 4498 OwningExprResult OpEqualRef 4499 = S.BuildMemberReferenceExpr(move(To), T, Loc, /*isArrow=*/false, SS, 4500 /*FirstQualifierInScope=*/0, OpLookup, 4501 /*TemplateArgs=*/0, 4502 /*SuppressQualifierCheck=*/true); 4503 if (OpEqualRef.isInvalid()) 4504 return S.StmtError(); 4505 4506 // Build the call to the assignment operator. 4507 Expr *FromE = From.takeAs<Expr>(); 4508 OwningExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4509 OpEqualRef.takeAs<Expr>(), 4510 Loc, &FromE, 1, 0, Loc); 4511 if (Call.isInvalid()) 4512 return S.StmtError(); 4513 4514 return S.Owned(Call.takeAs<Stmt>()); 4515 } 4516 4517 // - if the subobject is of scalar type, the built-in assignment 4518 // operator is used. 4519 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4520 if (!ArrayTy) { 4521 OwningExprResult Assignment = S.CreateBuiltinBinOp(Loc, 4522 BinaryOperator::Assign, 4523 To.takeAs<Expr>(), 4524 From.takeAs<Expr>()); 4525 if (Assignment.isInvalid()) 4526 return S.StmtError(); 4527 4528 return S.Owned(Assignment.takeAs<Stmt>()); 4529 } 4530 4531 // - if the subobject is an array, each element is assigned, in the 4532 // manner appropriate to the element type; 4533 4534 // Construct a loop over the array bounds, e.g., 4535 // 4536 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4537 // 4538 // that will copy each of the array elements. 4539 QualType SizeType = S.Context.getSizeType(); 4540 4541 // Create the iteration variable. 4542 IdentifierInfo *IterationVarName = 0; 4543 { 4544 llvm::SmallString<8> Str; 4545 llvm::raw_svector_ostream OS(Str); 4546 OS << "__i" << Depth; 4547 IterationVarName = &S.Context.Idents.get(OS.str()); 4548 } 4549 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4550 IterationVarName, SizeType, 4551 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4552 VarDecl::None, VarDecl::None); 4553 4554 // Initialize the iteration variable to zero. 4555 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4556 IterationVar->setInit(new (S.Context) IntegerLiteral(Zero, SizeType, Loc)); 4557 4558 // Create a reference to the iteration variable; we'll use this several 4559 // times throughout. 4560 Expr *IterationVarRef 4561 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4562 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4563 4564 // Create the DeclStmt that holds the iteration variable. 4565 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4566 4567 // Create the comparison against the array bound. 4568 llvm::APInt Upper = ArrayTy->getSize(); 4569 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4570 OwningExprResult Comparison 4571 = S.Owned(new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4572 new (S.Context) IntegerLiteral(Upper, SizeType, Loc), 4573 BinaryOperator::NE, S.Context.BoolTy, Loc)); 4574 4575 // Create the pre-increment of the iteration variable. 4576 OwningExprResult Increment 4577 = S.Owned(new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4578 UnaryOperator::PreInc, 4579 SizeType, Loc)); 4580 4581 // Subscript the "from" and "to" expressions with the iteration variable. 4582 From = S.CreateBuiltinArraySubscriptExpr(move(From), Loc, 4583 S.Owned(IterationVarRef->Retain()), 4584 Loc); 4585 To = S.CreateBuiltinArraySubscriptExpr(move(To), Loc, 4586 S.Owned(IterationVarRef->Retain()), 4587 Loc); 4588 assert(!From.isInvalid() && "Builtin subscripting can't fail!"); 4589 assert(!To.isInvalid() && "Builtin subscripting can't fail!"); 4590 4591 // Build the copy for an individual element of the array. 4592 OwningStmtResult Copy = BuildSingleCopyAssign(S, Loc, 4593 ArrayTy->getElementType(), 4594 move(To), move(From), 4595 CopyingBaseSubobject, Depth+1); 4596 if (Copy.isInvalid()) 4597 return S.StmtError(); 4598 4599 // Construct the loop that copies all elements of this array. 4600 return S.ActOnForStmt(Loc, Loc, S.Owned(InitStmt), 4601 S.MakeFullExpr(Comparison), 4602 Sema::DeclPtrTy(), 4603 S.MakeFullExpr(Increment), 4604 Loc, move(Copy)); 4605} 4606 4607/// \brief Determine whether the given class has a copy assignment operator 4608/// that accepts a const-qualified argument. 4609static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4610 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4611 4612 if (!Class->hasDeclaredCopyAssignment()) 4613 S.DeclareImplicitCopyAssignment(Class); 4614 4615 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4616 DeclarationName OpName 4617 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4618 4619 DeclContext::lookup_const_iterator Op, OpEnd; 4620 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4621 // C++ [class.copy]p9: 4622 // A user-declared copy assignment operator is a non-static non-template 4623 // member function of class X with exactly one parameter of type X, X&, 4624 // const X&, volatile X& or const volatile X&. 4625 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4626 if (!Method) 4627 continue; 4628 4629 if (Method->isStatic()) 4630 continue; 4631 if (Method->getPrimaryTemplate()) 4632 continue; 4633 const FunctionProtoType *FnType = 4634 Method->getType()->getAs<FunctionProtoType>(); 4635 assert(FnType && "Overloaded operator has no prototype."); 4636 // Don't assert on this; an invalid decl might have been left in the AST. 4637 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4638 continue; 4639 bool AcceptsConst = true; 4640 QualType ArgType = FnType->getArgType(0); 4641 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4642 ArgType = Ref->getPointeeType(); 4643 // Is it a non-const lvalue reference? 4644 if (!ArgType.isConstQualified()) 4645 AcceptsConst = false; 4646 } 4647 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4648 continue; 4649 4650 // We have a single argument of type cv X or cv X&, i.e. we've found the 4651 // copy assignment operator. Return whether it accepts const arguments. 4652 return AcceptsConst; 4653 } 4654 assert(Class->isInvalidDecl() && 4655 "No copy assignment operator declared in valid code."); 4656 return false; 4657} 4658 4659CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4660 // Note: The following rules are largely analoguous to the copy 4661 // constructor rules. Note that virtual bases are not taken into account 4662 // for determining the argument type of the operator. Note also that 4663 // operators taking an object instead of a reference are allowed. 4664 4665 4666 // C++ [class.copy]p10: 4667 // If the class definition does not explicitly declare a copy 4668 // assignment operator, one is declared implicitly. 4669 // The implicitly-defined copy assignment operator for a class X 4670 // will have the form 4671 // 4672 // X& X::operator=(const X&) 4673 // 4674 // if 4675 bool HasConstCopyAssignment = true; 4676 4677 // -- each direct base class B of X has a copy assignment operator 4678 // whose parameter is of type const B&, const volatile B& or B, 4679 // and 4680 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4681 BaseEnd = ClassDecl->bases_end(); 4682 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4683 assert(!Base->getType()->isDependentType() && 4684 "Cannot generate implicit members for class with dependent bases."); 4685 const CXXRecordDecl *BaseClassDecl 4686 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4687 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4688 } 4689 4690 // -- for all the nonstatic data members of X that are of a class 4691 // type M (or array thereof), each such class type has a copy 4692 // assignment operator whose parameter is of type const M&, 4693 // const volatile M& or M. 4694 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4695 FieldEnd = ClassDecl->field_end(); 4696 HasConstCopyAssignment && Field != FieldEnd; 4697 ++Field) { 4698 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4699 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4700 const CXXRecordDecl *FieldClassDecl 4701 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4702 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4703 } 4704 } 4705 4706 // Otherwise, the implicitly declared copy assignment operator will 4707 // have the form 4708 // 4709 // X& X::operator=(X&) 4710 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4711 QualType RetType = Context.getLValueReferenceType(ArgType); 4712 if (HasConstCopyAssignment) 4713 ArgType = ArgType.withConst(); 4714 ArgType = Context.getLValueReferenceType(ArgType); 4715 4716 // C++ [except.spec]p14: 4717 // An implicitly declared special member function (Clause 12) shall have an 4718 // exception-specification. [...] 4719 ImplicitExceptionSpecification ExceptSpec(Context); 4720 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4721 BaseEnd = ClassDecl->bases_end(); 4722 Base != BaseEnd; ++Base) { 4723 CXXRecordDecl *BaseClassDecl 4724 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4725 4726 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4727 DeclareImplicitCopyAssignment(BaseClassDecl); 4728 4729 if (CXXMethodDecl *CopyAssign 4730 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4731 ExceptSpec.CalledDecl(CopyAssign); 4732 } 4733 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4734 FieldEnd = ClassDecl->field_end(); 4735 Field != FieldEnd; 4736 ++Field) { 4737 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4738 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4739 CXXRecordDecl *FieldClassDecl 4740 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4741 4742 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 4743 DeclareImplicitCopyAssignment(FieldClassDecl); 4744 4745 if (CXXMethodDecl *CopyAssign 4746 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4747 ExceptSpec.CalledDecl(CopyAssign); 4748 } 4749 } 4750 4751 // An implicitly-declared copy assignment operator is an inline public 4752 // member of its class. 4753 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4754 CXXMethodDecl *CopyAssignment 4755 = CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 4756 Context.getFunctionType(RetType, &ArgType, 1, 4757 false, 0, 4758 ExceptSpec.hasExceptionSpecification(), 4759 ExceptSpec.hasAnyExceptionSpecification(), 4760 ExceptSpec.size(), 4761 ExceptSpec.data(), 4762 FunctionType::ExtInfo()), 4763 /*TInfo=*/0, /*isStatic=*/false, 4764 /*StorageClassAsWritten=*/FunctionDecl::None, 4765 /*isInline=*/true); 4766 CopyAssignment->setAccess(AS_public); 4767 CopyAssignment->setImplicit(); 4768 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4769 CopyAssignment->setCopyAssignment(true); 4770 4771 // Add the parameter to the operator. 4772 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4773 ClassDecl->getLocation(), 4774 /*Id=*/0, 4775 ArgType, /*TInfo=*/0, 4776 VarDecl::None, 4777 VarDecl::None, 0); 4778 CopyAssignment->setParams(&FromParam, 1); 4779 4780 // Note that we have added this copy-assignment operator. 4781 ClassDecl->setDeclaredCopyAssignment(true); 4782 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 4783 4784 if (Scope *S = getScopeForContext(ClassDecl)) 4785 PushOnScopeChains(CopyAssignment, S, false); 4786 ClassDecl->addDecl(CopyAssignment); 4787 4788 AddOverriddenMethods(ClassDecl, CopyAssignment); 4789 return CopyAssignment; 4790} 4791 4792void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4793 CXXMethodDecl *CopyAssignOperator) { 4794 assert((CopyAssignOperator->isImplicit() && 4795 CopyAssignOperator->isOverloadedOperator() && 4796 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4797 !CopyAssignOperator->isUsed(false)) && 4798 "DefineImplicitCopyAssignment called for wrong function"); 4799 4800 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4801 4802 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4803 CopyAssignOperator->setInvalidDecl(); 4804 return; 4805 } 4806 4807 CopyAssignOperator->setUsed(); 4808 4809 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4810 ErrorTrap Trap(*this); 4811 4812 // C++0x [class.copy]p30: 4813 // The implicitly-defined or explicitly-defaulted copy assignment operator 4814 // for a non-union class X performs memberwise copy assignment of its 4815 // subobjects. The direct base classes of X are assigned first, in the 4816 // order of their declaration in the base-specifier-list, and then the 4817 // immediate non-static data members of X are assigned, in the order in 4818 // which they were declared in the class definition. 4819 4820 // The statements that form the synthesized function body. 4821 ASTOwningVector<&ActionBase::DeleteStmt> Statements(*this); 4822 4823 // The parameter for the "other" object, which we are copying from. 4824 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4825 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4826 QualType OtherRefType = Other->getType(); 4827 if (const LValueReferenceType *OtherRef 4828 = OtherRefType->getAs<LValueReferenceType>()) { 4829 OtherRefType = OtherRef->getPointeeType(); 4830 OtherQuals = OtherRefType.getQualifiers(); 4831 } 4832 4833 // Our location for everything implicitly-generated. 4834 SourceLocation Loc = CopyAssignOperator->getLocation(); 4835 4836 // Construct a reference to the "other" object. We'll be using this 4837 // throughout the generated ASTs. 4838 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4839 assert(OtherRef && "Reference to parameter cannot fail!"); 4840 4841 // Construct the "this" pointer. We'll be using this throughout the generated 4842 // ASTs. 4843 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4844 assert(This && "Reference to this cannot fail!"); 4845 4846 // Assign base classes. 4847 bool Invalid = false; 4848 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4849 E = ClassDecl->bases_end(); Base != E; ++Base) { 4850 // Form the assignment: 4851 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4852 QualType BaseType = Base->getType().getUnqualifiedType(); 4853 CXXRecordDecl *BaseClassDecl = 0; 4854 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4855 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4856 else { 4857 Invalid = true; 4858 continue; 4859 } 4860 4861 CXXCastPath BasePath; 4862 BasePath.push_back(Base); 4863 4864 // Construct the "from" expression, which is an implicit cast to the 4865 // appropriately-qualified base type. 4866 Expr *From = OtherRef->Retain(); 4867 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4868 CastExpr::CK_UncheckedDerivedToBase, 4869 ImplicitCastExpr::LValue, &BasePath); 4870 4871 // Dereference "this". 4872 OwningExprResult To = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4873 Owned(This->Retain())); 4874 4875 // Implicitly cast "this" to the appropriately-qualified base type. 4876 Expr *ToE = To.takeAs<Expr>(); 4877 ImpCastExprToType(ToE, 4878 Context.getCVRQualifiedType(BaseType, 4879 CopyAssignOperator->getTypeQualifiers()), 4880 CastExpr::CK_UncheckedDerivedToBase, 4881 ImplicitCastExpr::LValue, &BasePath); 4882 To = Owned(ToE); 4883 4884 // Build the copy. 4885 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4886 move(To), Owned(From), 4887 /*CopyingBaseSubobject=*/true); 4888 if (Copy.isInvalid()) { 4889 Diag(CurrentLocation, diag::note_member_synthesized_at) 4890 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4891 CopyAssignOperator->setInvalidDecl(); 4892 return; 4893 } 4894 4895 // Success! Record the copy. 4896 Statements.push_back(Copy.takeAs<Expr>()); 4897 } 4898 4899 // \brief Reference to the __builtin_memcpy function. 4900 Expr *BuiltinMemCpyRef = 0; 4901 // \brief Reference to the __builtin_objc_memmove_collectable function. 4902 Expr *CollectableMemCpyRef = 0; 4903 4904 // Assign non-static members. 4905 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4906 FieldEnd = ClassDecl->field_end(); 4907 Field != FieldEnd; ++Field) { 4908 // Check for members of reference type; we can't copy those. 4909 if (Field->getType()->isReferenceType()) { 4910 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4911 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4912 Diag(Field->getLocation(), diag::note_declared_at); 4913 Diag(CurrentLocation, diag::note_member_synthesized_at) 4914 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4915 Invalid = true; 4916 continue; 4917 } 4918 4919 // Check for members of const-qualified, non-class type. 4920 QualType BaseType = Context.getBaseElementType(Field->getType()); 4921 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4922 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4923 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4924 Diag(Field->getLocation(), diag::note_declared_at); 4925 Diag(CurrentLocation, diag::note_member_synthesized_at) 4926 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4927 Invalid = true; 4928 continue; 4929 } 4930 4931 QualType FieldType = Field->getType().getNonReferenceType(); 4932 if (FieldType->isIncompleteArrayType()) { 4933 assert(ClassDecl->hasFlexibleArrayMember() && 4934 "Incomplete array type is not valid"); 4935 continue; 4936 } 4937 4938 // Build references to the field in the object we're copying from and to. 4939 CXXScopeSpec SS; // Intentionally empty 4940 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 4941 LookupMemberName); 4942 MemberLookup.addDecl(*Field); 4943 MemberLookup.resolveKind(); 4944 OwningExprResult From = BuildMemberReferenceExpr(Owned(OtherRef->Retain()), 4945 OtherRefType, 4946 Loc, /*IsArrow=*/false, 4947 SS, 0, MemberLookup, 0); 4948 OwningExprResult To = BuildMemberReferenceExpr(Owned(This->Retain()), 4949 This->getType(), 4950 Loc, /*IsArrow=*/true, 4951 SS, 0, MemberLookup, 0); 4952 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 4953 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 4954 4955 // If the field should be copied with __builtin_memcpy rather than via 4956 // explicit assignments, do so. This optimization only applies for arrays 4957 // of scalars and arrays of class type with trivial copy-assignment 4958 // operators. 4959 if (FieldType->isArrayType() && 4960 (!BaseType->isRecordType() || 4961 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 4962 ->hasTrivialCopyAssignment())) { 4963 // Compute the size of the memory buffer to be copied. 4964 QualType SizeType = Context.getSizeType(); 4965 llvm::APInt Size(Context.getTypeSize(SizeType), 4966 Context.getTypeSizeInChars(BaseType).getQuantity()); 4967 for (const ConstantArrayType *Array 4968 = Context.getAsConstantArrayType(FieldType); 4969 Array; 4970 Array = Context.getAsConstantArrayType(Array->getElementType())) { 4971 llvm::APInt ArraySize = Array->getSize(); 4972 ArraySize.zextOrTrunc(Size.getBitWidth()); 4973 Size *= ArraySize; 4974 } 4975 4976 // Take the address of the field references for "from" and "to". 4977 From = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(From)); 4978 To = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(To)); 4979 4980 bool NeedsCollectableMemCpy = 4981 (BaseType->isRecordType() && 4982 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 4983 4984 if (NeedsCollectableMemCpy) { 4985 if (!CollectableMemCpyRef) { 4986 // Create a reference to the __builtin_objc_memmove_collectable function. 4987 LookupResult R(*this, 4988 &Context.Idents.get("__builtin_objc_memmove_collectable"), 4989 Loc, LookupOrdinaryName); 4990 LookupName(R, TUScope, true); 4991 4992 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 4993 if (!CollectableMemCpy) { 4994 // Something went horribly wrong earlier, and we will have 4995 // complained about it. 4996 Invalid = true; 4997 continue; 4998 } 4999 5000 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5001 CollectableMemCpy->getType(), 5002 Loc, 0).takeAs<Expr>(); 5003 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5004 } 5005 } 5006 // Create a reference to the __builtin_memcpy builtin function. 5007 else if (!BuiltinMemCpyRef) { 5008 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5009 LookupOrdinaryName); 5010 LookupName(R, TUScope, true); 5011 5012 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5013 if (!BuiltinMemCpy) { 5014 // Something went horribly wrong earlier, and we will have complained 5015 // about it. 5016 Invalid = true; 5017 continue; 5018 } 5019 5020 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5021 BuiltinMemCpy->getType(), 5022 Loc, 0).takeAs<Expr>(); 5023 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5024 } 5025 5026 ASTOwningVector<&ActionBase::DeleteExpr> CallArgs(*this); 5027 CallArgs.push_back(To.takeAs<Expr>()); 5028 CallArgs.push_back(From.takeAs<Expr>()); 5029 CallArgs.push_back(new (Context) IntegerLiteral(Size, SizeType, Loc)); 5030 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 5031 Commas.push_back(Loc); 5032 Commas.push_back(Loc); 5033 OwningExprResult Call = ExprError(); 5034 if (NeedsCollectableMemCpy) 5035 Call = ActOnCallExpr(/*Scope=*/0, 5036 Owned(CollectableMemCpyRef->Retain()), 5037 Loc, move_arg(CallArgs), 5038 Commas.data(), Loc); 5039 else 5040 Call = ActOnCallExpr(/*Scope=*/0, 5041 Owned(BuiltinMemCpyRef->Retain()), 5042 Loc, move_arg(CallArgs), 5043 Commas.data(), Loc); 5044 5045 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5046 Statements.push_back(Call.takeAs<Expr>()); 5047 continue; 5048 } 5049 5050 // Build the copy of this field. 5051 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5052 move(To), move(From), 5053 /*CopyingBaseSubobject=*/false); 5054 if (Copy.isInvalid()) { 5055 Diag(CurrentLocation, diag::note_member_synthesized_at) 5056 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5057 CopyAssignOperator->setInvalidDecl(); 5058 return; 5059 } 5060 5061 // Success! Record the copy. 5062 Statements.push_back(Copy.takeAs<Stmt>()); 5063 } 5064 5065 if (!Invalid) { 5066 // Add a "return *this;" 5067 OwningExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 5068 Owned(This->Retain())); 5069 5070 OwningStmtResult Return = ActOnReturnStmt(Loc, move(ThisObj)); 5071 if (Return.isInvalid()) 5072 Invalid = true; 5073 else { 5074 Statements.push_back(Return.takeAs<Stmt>()); 5075 5076 if (Trap.hasErrorOccurred()) { 5077 Diag(CurrentLocation, diag::note_member_synthesized_at) 5078 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5079 Invalid = true; 5080 } 5081 } 5082 } 5083 5084 if (Invalid) { 5085 CopyAssignOperator->setInvalidDecl(); 5086 return; 5087 } 5088 5089 OwningStmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5090 /*isStmtExpr=*/false); 5091 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5092 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5093} 5094 5095CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5096 CXXRecordDecl *ClassDecl) { 5097 // C++ [class.copy]p4: 5098 // If the class definition does not explicitly declare a copy 5099 // constructor, one is declared implicitly. 5100 5101 // C++ [class.copy]p5: 5102 // The implicitly-declared copy constructor for a class X will 5103 // have the form 5104 // 5105 // X::X(const X&) 5106 // 5107 // if 5108 bool HasConstCopyConstructor = true; 5109 5110 // -- each direct or virtual base class B of X has a copy 5111 // constructor whose first parameter is of type const B& or 5112 // const volatile B&, and 5113 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5114 BaseEnd = ClassDecl->bases_end(); 5115 HasConstCopyConstructor && Base != BaseEnd; 5116 ++Base) { 5117 // Virtual bases are handled below. 5118 if (Base->isVirtual()) 5119 continue; 5120 5121 CXXRecordDecl *BaseClassDecl 5122 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5123 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5124 DeclareImplicitCopyConstructor(BaseClassDecl); 5125 5126 HasConstCopyConstructor 5127 = BaseClassDecl->hasConstCopyConstructor(Context); 5128 } 5129 5130 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5131 BaseEnd = ClassDecl->vbases_end(); 5132 HasConstCopyConstructor && Base != BaseEnd; 5133 ++Base) { 5134 CXXRecordDecl *BaseClassDecl 5135 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5136 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5137 DeclareImplicitCopyConstructor(BaseClassDecl); 5138 5139 HasConstCopyConstructor 5140 = BaseClassDecl->hasConstCopyConstructor(Context); 5141 } 5142 5143 // -- for all the nonstatic data members of X that are of a 5144 // class type M (or array thereof), each such class type 5145 // has a copy constructor whose first parameter is of type 5146 // const M& or const volatile M&. 5147 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5148 FieldEnd = ClassDecl->field_end(); 5149 HasConstCopyConstructor && Field != FieldEnd; 5150 ++Field) { 5151 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5152 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5153 CXXRecordDecl *FieldClassDecl 5154 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5155 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5156 DeclareImplicitCopyConstructor(FieldClassDecl); 5157 5158 HasConstCopyConstructor 5159 = FieldClassDecl->hasConstCopyConstructor(Context); 5160 } 5161 } 5162 5163 // Otherwise, the implicitly declared copy constructor will have 5164 // the form 5165 // 5166 // X::X(X&) 5167 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5168 QualType ArgType = ClassType; 5169 if (HasConstCopyConstructor) 5170 ArgType = ArgType.withConst(); 5171 ArgType = Context.getLValueReferenceType(ArgType); 5172 5173 // C++ [except.spec]p14: 5174 // An implicitly declared special member function (Clause 12) shall have an 5175 // exception-specification. [...] 5176 ImplicitExceptionSpecification ExceptSpec(Context); 5177 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5178 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5179 BaseEnd = ClassDecl->bases_end(); 5180 Base != BaseEnd; 5181 ++Base) { 5182 // Virtual bases are handled below. 5183 if (Base->isVirtual()) 5184 continue; 5185 5186 CXXRecordDecl *BaseClassDecl 5187 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5188 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5189 DeclareImplicitCopyConstructor(BaseClassDecl); 5190 5191 if (CXXConstructorDecl *CopyConstructor 5192 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5193 ExceptSpec.CalledDecl(CopyConstructor); 5194 } 5195 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5196 BaseEnd = ClassDecl->vbases_end(); 5197 Base != BaseEnd; 5198 ++Base) { 5199 CXXRecordDecl *BaseClassDecl 5200 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5201 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5202 DeclareImplicitCopyConstructor(BaseClassDecl); 5203 5204 if (CXXConstructorDecl *CopyConstructor 5205 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5206 ExceptSpec.CalledDecl(CopyConstructor); 5207 } 5208 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5209 FieldEnd = ClassDecl->field_end(); 5210 Field != FieldEnd; 5211 ++Field) { 5212 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5213 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5214 CXXRecordDecl *FieldClassDecl 5215 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5216 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5217 DeclareImplicitCopyConstructor(FieldClassDecl); 5218 5219 if (CXXConstructorDecl *CopyConstructor 5220 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5221 ExceptSpec.CalledDecl(CopyConstructor); 5222 } 5223 } 5224 5225 // An implicitly-declared copy constructor is an inline public 5226 // member of its class. 5227 DeclarationName Name 5228 = Context.DeclarationNames.getCXXConstructorName( 5229 Context.getCanonicalType(ClassType)); 5230 CXXConstructorDecl *CopyConstructor 5231 = CXXConstructorDecl::Create(Context, ClassDecl, 5232 ClassDecl->getLocation(), Name, 5233 Context.getFunctionType(Context.VoidTy, 5234 &ArgType, 1, 5235 false, 0, 5236 ExceptSpec.hasExceptionSpecification(), 5237 ExceptSpec.hasAnyExceptionSpecification(), 5238 ExceptSpec.size(), 5239 ExceptSpec.data(), 5240 FunctionType::ExtInfo()), 5241 /*TInfo=*/0, 5242 /*isExplicit=*/false, 5243 /*isInline=*/true, 5244 /*isImplicitlyDeclared=*/true); 5245 CopyConstructor->setAccess(AS_public); 5246 CopyConstructor->setImplicit(); 5247 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5248 5249 // Note that we have declared this constructor. 5250 ClassDecl->setDeclaredCopyConstructor(true); 5251 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5252 5253 // Add the parameter to the constructor. 5254 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5255 ClassDecl->getLocation(), 5256 /*IdentifierInfo=*/0, 5257 ArgType, /*TInfo=*/0, 5258 VarDecl::None, 5259 VarDecl::None, 0); 5260 CopyConstructor->setParams(&FromParam, 1); 5261 if (Scope *S = getScopeForContext(ClassDecl)) 5262 PushOnScopeChains(CopyConstructor, S, false); 5263 ClassDecl->addDecl(CopyConstructor); 5264 5265 return CopyConstructor; 5266} 5267 5268void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5269 CXXConstructorDecl *CopyConstructor, 5270 unsigned TypeQuals) { 5271 assert((CopyConstructor->isImplicit() && 5272 CopyConstructor->isCopyConstructor(TypeQuals) && 5273 !CopyConstructor->isUsed(false)) && 5274 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5275 5276 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5277 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5278 5279 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5280 ErrorTrap Trap(*this); 5281 5282 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5283 Trap.hasErrorOccurred()) { 5284 Diag(CurrentLocation, diag::note_member_synthesized_at) 5285 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5286 CopyConstructor->setInvalidDecl(); 5287 } else { 5288 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5289 CopyConstructor->getLocation(), 5290 MultiStmtArg(*this, 0, 0), 5291 /*isStmtExpr=*/false) 5292 .takeAs<Stmt>()); 5293 } 5294 5295 CopyConstructor->setUsed(); 5296} 5297 5298Sema::OwningExprResult 5299Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5300 CXXConstructorDecl *Constructor, 5301 MultiExprArg ExprArgs, 5302 bool RequiresZeroInit, 5303 CXXConstructExpr::ConstructionKind ConstructKind) { 5304 bool Elidable = false; 5305 5306 // C++0x [class.copy]p34: 5307 // When certain criteria are met, an implementation is allowed to 5308 // omit the copy/move construction of a class object, even if the 5309 // copy/move constructor and/or destructor for the object have 5310 // side effects. [...] 5311 // - when a temporary class object that has not been bound to a 5312 // reference (12.2) would be copied/moved to a class object 5313 // with the same cv-unqualified type, the copy/move operation 5314 // can be omitted by constructing the temporary object 5315 // directly into the target of the omitted copy/move 5316 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5317 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5318 Elidable = SubExpr->isTemporaryObject() && 5319 Context.hasSameUnqualifiedType(SubExpr->getType(), 5320 Context.getTypeDeclType(Constructor->getParent())); 5321 } 5322 5323 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5324 Elidable, move(ExprArgs), RequiresZeroInit, 5325 ConstructKind); 5326} 5327 5328/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5329/// including handling of its default argument expressions. 5330Sema::OwningExprResult 5331Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5332 CXXConstructorDecl *Constructor, bool Elidable, 5333 MultiExprArg ExprArgs, 5334 bool RequiresZeroInit, 5335 CXXConstructExpr::ConstructionKind ConstructKind) { 5336 unsigned NumExprs = ExprArgs.size(); 5337 Expr **Exprs = (Expr **)ExprArgs.release(); 5338 5339 MarkDeclarationReferenced(ConstructLoc, Constructor); 5340 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5341 Constructor, Elidable, Exprs, NumExprs, 5342 RequiresZeroInit, ConstructKind)); 5343} 5344 5345bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5346 CXXConstructorDecl *Constructor, 5347 MultiExprArg Exprs) { 5348 OwningExprResult TempResult = 5349 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5350 move(Exprs)); 5351 if (TempResult.isInvalid()) 5352 return true; 5353 5354 Expr *Temp = TempResult.takeAs<Expr>(); 5355 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5356 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 5357 VD->setInit(Temp); 5358 5359 return false; 5360} 5361 5362void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5363 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5364 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5365 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5366 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5367 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5368 CheckDestructorAccess(VD->getLocation(), Destructor, 5369 PDiag(diag::err_access_dtor_var) 5370 << VD->getDeclName() 5371 << VD->getType()); 5372 5373 if (!VD->isInvalidDecl() && VD->hasGlobalStorage()) 5374 Diag(VD->getLocation(), diag::warn_global_destructor); 5375 } 5376} 5377 5378/// AddCXXDirectInitializerToDecl - This action is called immediately after 5379/// ActOnDeclarator, when a C++ direct initializer is present. 5380/// e.g: "int x(1);" 5381void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 5382 SourceLocation LParenLoc, 5383 MultiExprArg Exprs, 5384 SourceLocation *CommaLocs, 5385 SourceLocation RParenLoc) { 5386 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5387 Decl *RealDecl = Dcl.getAs<Decl>(); 5388 5389 // If there is no declaration, there was an error parsing it. Just ignore 5390 // the initializer. 5391 if (RealDecl == 0) 5392 return; 5393 5394 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5395 if (!VDecl) { 5396 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5397 RealDecl->setInvalidDecl(); 5398 return; 5399 } 5400 5401 // We will represent direct-initialization similarly to copy-initialization: 5402 // int x(1); -as-> int x = 1; 5403 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5404 // 5405 // Clients that want to distinguish between the two forms, can check for 5406 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5407 // A major benefit is that clients that don't particularly care about which 5408 // exactly form was it (like the CodeGen) can handle both cases without 5409 // special case code. 5410 5411 // C++ 8.5p11: 5412 // The form of initialization (using parentheses or '=') is generally 5413 // insignificant, but does matter when the entity being initialized has a 5414 // class type. 5415 5416 if (!VDecl->getType()->isDependentType() && 5417 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5418 diag::err_typecheck_decl_incomplete_type)) { 5419 VDecl->setInvalidDecl(); 5420 return; 5421 } 5422 5423 // The variable can not have an abstract class type. 5424 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5425 diag::err_abstract_type_in_decl, 5426 AbstractVariableType)) 5427 VDecl->setInvalidDecl(); 5428 5429 const VarDecl *Def; 5430 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5431 Diag(VDecl->getLocation(), diag::err_redefinition) 5432 << VDecl->getDeclName(); 5433 Diag(Def->getLocation(), diag::note_previous_definition); 5434 VDecl->setInvalidDecl(); 5435 return; 5436 } 5437 5438 // If either the declaration has a dependent type or if any of the 5439 // expressions is type-dependent, we represent the initialization 5440 // via a ParenListExpr for later use during template instantiation. 5441 if (VDecl->getType()->isDependentType() || 5442 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5443 // Let clients know that initialization was done with a direct initializer. 5444 VDecl->setCXXDirectInitializer(true); 5445 5446 // Store the initialization expressions as a ParenListExpr. 5447 unsigned NumExprs = Exprs.size(); 5448 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5449 (Expr **)Exprs.release(), 5450 NumExprs, RParenLoc)); 5451 return; 5452 } 5453 5454 // Capture the variable that is being initialized and the style of 5455 // initialization. 5456 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5457 5458 // FIXME: Poor source location information. 5459 InitializationKind Kind 5460 = InitializationKind::CreateDirect(VDecl->getLocation(), 5461 LParenLoc, RParenLoc); 5462 5463 InitializationSequence InitSeq(*this, Entity, Kind, 5464 (Expr**)Exprs.get(), Exprs.size()); 5465 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5466 if (Result.isInvalid()) { 5467 VDecl->setInvalidDecl(); 5468 return; 5469 } 5470 5471 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 5472 VDecl->setInit(Result.takeAs<Expr>()); 5473 VDecl->setCXXDirectInitializer(true); 5474 5475 if (!VDecl->isInvalidDecl() && 5476 !VDecl->getDeclContext()->isDependentContext() && 5477 VDecl->hasGlobalStorage() && 5478 !VDecl->getInit()->isConstantInitializer(Context, 5479 VDecl->getType()->isReferenceType())) 5480 Diag(VDecl->getLocation(), diag::warn_global_constructor) 5481 << VDecl->getInit()->getSourceRange(); 5482 5483 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5484 FinalizeVarWithDestructor(VDecl, Record); 5485} 5486 5487/// \brief Given a constructor and the set of arguments provided for the 5488/// constructor, convert the arguments and add any required default arguments 5489/// to form a proper call to this constructor. 5490/// 5491/// \returns true if an error occurred, false otherwise. 5492bool 5493Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5494 MultiExprArg ArgsPtr, 5495 SourceLocation Loc, 5496 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 5497 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5498 unsigned NumArgs = ArgsPtr.size(); 5499 Expr **Args = (Expr **)ArgsPtr.get(); 5500 5501 const FunctionProtoType *Proto 5502 = Constructor->getType()->getAs<FunctionProtoType>(); 5503 assert(Proto && "Constructor without a prototype?"); 5504 unsigned NumArgsInProto = Proto->getNumArgs(); 5505 5506 // If too few arguments are available, we'll fill in the rest with defaults. 5507 if (NumArgs < NumArgsInProto) 5508 ConvertedArgs.reserve(NumArgsInProto); 5509 else 5510 ConvertedArgs.reserve(NumArgs); 5511 5512 VariadicCallType CallType = 5513 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5514 llvm::SmallVector<Expr *, 8> AllArgs; 5515 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5516 Proto, 0, Args, NumArgs, AllArgs, 5517 CallType); 5518 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5519 ConvertedArgs.push_back(AllArgs[i]); 5520 return Invalid; 5521} 5522 5523static inline bool 5524CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5525 const FunctionDecl *FnDecl) { 5526 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 5527 if (isa<NamespaceDecl>(DC)) { 5528 return SemaRef.Diag(FnDecl->getLocation(), 5529 diag::err_operator_new_delete_declared_in_namespace) 5530 << FnDecl->getDeclName(); 5531 } 5532 5533 if (isa<TranslationUnitDecl>(DC) && 5534 FnDecl->getStorageClass() == FunctionDecl::Static) { 5535 return SemaRef.Diag(FnDecl->getLocation(), 5536 diag::err_operator_new_delete_declared_static) 5537 << FnDecl->getDeclName(); 5538 } 5539 5540 return false; 5541} 5542 5543static inline bool 5544CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5545 CanQualType ExpectedResultType, 5546 CanQualType ExpectedFirstParamType, 5547 unsigned DependentParamTypeDiag, 5548 unsigned InvalidParamTypeDiag) { 5549 QualType ResultType = 5550 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5551 5552 // Check that the result type is not dependent. 5553 if (ResultType->isDependentType()) 5554 return SemaRef.Diag(FnDecl->getLocation(), 5555 diag::err_operator_new_delete_dependent_result_type) 5556 << FnDecl->getDeclName() << ExpectedResultType; 5557 5558 // Check that the result type is what we expect. 5559 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5560 return SemaRef.Diag(FnDecl->getLocation(), 5561 diag::err_operator_new_delete_invalid_result_type) 5562 << FnDecl->getDeclName() << ExpectedResultType; 5563 5564 // A function template must have at least 2 parameters. 5565 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5566 return SemaRef.Diag(FnDecl->getLocation(), 5567 diag::err_operator_new_delete_template_too_few_parameters) 5568 << FnDecl->getDeclName(); 5569 5570 // The function decl must have at least 1 parameter. 5571 if (FnDecl->getNumParams() == 0) 5572 return SemaRef.Diag(FnDecl->getLocation(), 5573 diag::err_operator_new_delete_too_few_parameters) 5574 << FnDecl->getDeclName(); 5575 5576 // Check the the first parameter type is not dependent. 5577 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5578 if (FirstParamType->isDependentType()) 5579 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5580 << FnDecl->getDeclName() << ExpectedFirstParamType; 5581 5582 // Check that the first parameter type is what we expect. 5583 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5584 ExpectedFirstParamType) 5585 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5586 << FnDecl->getDeclName() << ExpectedFirstParamType; 5587 5588 return false; 5589} 5590 5591static bool 5592CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5593 // C++ [basic.stc.dynamic.allocation]p1: 5594 // A program is ill-formed if an allocation function is declared in a 5595 // namespace scope other than global scope or declared static in global 5596 // scope. 5597 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5598 return true; 5599 5600 CanQualType SizeTy = 5601 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5602 5603 // C++ [basic.stc.dynamic.allocation]p1: 5604 // The return type shall be void*. The first parameter shall have type 5605 // std::size_t. 5606 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5607 SizeTy, 5608 diag::err_operator_new_dependent_param_type, 5609 diag::err_operator_new_param_type)) 5610 return true; 5611 5612 // C++ [basic.stc.dynamic.allocation]p1: 5613 // The first parameter shall not have an associated default argument. 5614 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5615 return SemaRef.Diag(FnDecl->getLocation(), 5616 diag::err_operator_new_default_arg) 5617 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5618 5619 return false; 5620} 5621 5622static bool 5623CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5624 // C++ [basic.stc.dynamic.deallocation]p1: 5625 // A program is ill-formed if deallocation functions are declared in a 5626 // namespace scope other than global scope or declared static in global 5627 // scope. 5628 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5629 return true; 5630 5631 // C++ [basic.stc.dynamic.deallocation]p2: 5632 // Each deallocation function shall return void and its first parameter 5633 // shall be void*. 5634 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5635 SemaRef.Context.VoidPtrTy, 5636 diag::err_operator_delete_dependent_param_type, 5637 diag::err_operator_delete_param_type)) 5638 return true; 5639 5640 return false; 5641} 5642 5643/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5644/// of this overloaded operator is well-formed. If so, returns false; 5645/// otherwise, emits appropriate diagnostics and returns true. 5646bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5647 assert(FnDecl && FnDecl->isOverloadedOperator() && 5648 "Expected an overloaded operator declaration"); 5649 5650 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5651 5652 // C++ [over.oper]p5: 5653 // The allocation and deallocation functions, operator new, 5654 // operator new[], operator delete and operator delete[], are 5655 // described completely in 3.7.3. The attributes and restrictions 5656 // found in the rest of this subclause do not apply to them unless 5657 // explicitly stated in 3.7.3. 5658 if (Op == OO_Delete || Op == OO_Array_Delete) 5659 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5660 5661 if (Op == OO_New || Op == OO_Array_New) 5662 return CheckOperatorNewDeclaration(*this, FnDecl); 5663 5664 // C++ [over.oper]p6: 5665 // An operator function shall either be a non-static member 5666 // function or be a non-member function and have at least one 5667 // parameter whose type is a class, a reference to a class, an 5668 // enumeration, or a reference to an enumeration. 5669 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5670 if (MethodDecl->isStatic()) 5671 return Diag(FnDecl->getLocation(), 5672 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5673 } else { 5674 bool ClassOrEnumParam = false; 5675 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5676 ParamEnd = FnDecl->param_end(); 5677 Param != ParamEnd; ++Param) { 5678 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5679 if (ParamType->isDependentType() || ParamType->isRecordType() || 5680 ParamType->isEnumeralType()) { 5681 ClassOrEnumParam = true; 5682 break; 5683 } 5684 } 5685 5686 if (!ClassOrEnumParam) 5687 return Diag(FnDecl->getLocation(), 5688 diag::err_operator_overload_needs_class_or_enum) 5689 << FnDecl->getDeclName(); 5690 } 5691 5692 // C++ [over.oper]p8: 5693 // An operator function cannot have default arguments (8.3.6), 5694 // except where explicitly stated below. 5695 // 5696 // Only the function-call operator allows default arguments 5697 // (C++ [over.call]p1). 5698 if (Op != OO_Call) { 5699 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5700 Param != FnDecl->param_end(); ++Param) { 5701 if ((*Param)->hasDefaultArg()) 5702 return Diag((*Param)->getLocation(), 5703 diag::err_operator_overload_default_arg) 5704 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5705 } 5706 } 5707 5708 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5709 { false, false, false } 5710#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5711 , { Unary, Binary, MemberOnly } 5712#include "clang/Basic/OperatorKinds.def" 5713 }; 5714 5715 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5716 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5717 bool MustBeMemberOperator = OperatorUses[Op][2]; 5718 5719 // C++ [over.oper]p8: 5720 // [...] Operator functions cannot have more or fewer parameters 5721 // than the number required for the corresponding operator, as 5722 // described in the rest of this subclause. 5723 unsigned NumParams = FnDecl->getNumParams() 5724 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5725 if (Op != OO_Call && 5726 ((NumParams == 1 && !CanBeUnaryOperator) || 5727 (NumParams == 2 && !CanBeBinaryOperator) || 5728 (NumParams < 1) || (NumParams > 2))) { 5729 // We have the wrong number of parameters. 5730 unsigned ErrorKind; 5731 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5732 ErrorKind = 2; // 2 -> unary or binary. 5733 } else if (CanBeUnaryOperator) { 5734 ErrorKind = 0; // 0 -> unary 5735 } else { 5736 assert(CanBeBinaryOperator && 5737 "All non-call overloaded operators are unary or binary!"); 5738 ErrorKind = 1; // 1 -> binary 5739 } 5740 5741 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5742 << FnDecl->getDeclName() << NumParams << ErrorKind; 5743 } 5744 5745 // Overloaded operators other than operator() cannot be variadic. 5746 if (Op != OO_Call && 5747 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5748 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5749 << FnDecl->getDeclName(); 5750 } 5751 5752 // Some operators must be non-static member functions. 5753 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5754 return Diag(FnDecl->getLocation(), 5755 diag::err_operator_overload_must_be_member) 5756 << FnDecl->getDeclName(); 5757 } 5758 5759 // C++ [over.inc]p1: 5760 // The user-defined function called operator++ implements the 5761 // prefix and postfix ++ operator. If this function is a member 5762 // function with no parameters, or a non-member function with one 5763 // parameter of class or enumeration type, it defines the prefix 5764 // increment operator ++ for objects of that type. If the function 5765 // is a member function with one parameter (which shall be of type 5766 // int) or a non-member function with two parameters (the second 5767 // of which shall be of type int), it defines the postfix 5768 // increment operator ++ for objects of that type. 5769 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5770 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5771 bool ParamIsInt = false; 5772 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5773 ParamIsInt = BT->getKind() == BuiltinType::Int; 5774 5775 if (!ParamIsInt) 5776 return Diag(LastParam->getLocation(), 5777 diag::err_operator_overload_post_incdec_must_be_int) 5778 << LastParam->getType() << (Op == OO_MinusMinus); 5779 } 5780 5781 // Notify the class if it got an assignment operator. 5782 if (Op == OO_Equal) { 5783 // Would have returned earlier otherwise. 5784 assert(isa<CXXMethodDecl>(FnDecl) && 5785 "Overloaded = not member, but not filtered."); 5786 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5787 Method->getParent()->addedAssignmentOperator(Context, Method); 5788 } 5789 5790 return false; 5791} 5792 5793/// CheckLiteralOperatorDeclaration - Check whether the declaration 5794/// of this literal operator function is well-formed. If so, returns 5795/// false; otherwise, emits appropriate diagnostics and returns true. 5796bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5797 DeclContext *DC = FnDecl->getDeclContext(); 5798 Decl::Kind Kind = DC->getDeclKind(); 5799 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5800 Kind != Decl::LinkageSpec) { 5801 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5802 << FnDecl->getDeclName(); 5803 return true; 5804 } 5805 5806 bool Valid = false; 5807 5808 // template <char...> type operator "" name() is the only valid template 5809 // signature, and the only valid signature with no parameters. 5810 if (FnDecl->param_size() == 0) { 5811 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5812 // Must have only one template parameter 5813 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5814 if (Params->size() == 1) { 5815 NonTypeTemplateParmDecl *PmDecl = 5816 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5817 5818 // The template parameter must be a char parameter pack. 5819 // FIXME: This test will always fail because non-type parameter packs 5820 // have not been implemented. 5821 if (PmDecl && PmDecl->isTemplateParameterPack() && 5822 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5823 Valid = true; 5824 } 5825 } 5826 } else { 5827 // Check the first parameter 5828 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5829 5830 QualType T = (*Param)->getType(); 5831 5832 // unsigned long long int, long double, and any character type are allowed 5833 // as the only parameters. 5834 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5835 Context.hasSameType(T, Context.LongDoubleTy) || 5836 Context.hasSameType(T, Context.CharTy) || 5837 Context.hasSameType(T, Context.WCharTy) || 5838 Context.hasSameType(T, Context.Char16Ty) || 5839 Context.hasSameType(T, Context.Char32Ty)) { 5840 if (++Param == FnDecl->param_end()) 5841 Valid = true; 5842 goto FinishedParams; 5843 } 5844 5845 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5846 const PointerType *PT = T->getAs<PointerType>(); 5847 if (!PT) 5848 goto FinishedParams; 5849 T = PT->getPointeeType(); 5850 if (!T.isConstQualified()) 5851 goto FinishedParams; 5852 T = T.getUnqualifiedType(); 5853 5854 // Move on to the second parameter; 5855 ++Param; 5856 5857 // If there is no second parameter, the first must be a const char * 5858 if (Param == FnDecl->param_end()) { 5859 if (Context.hasSameType(T, Context.CharTy)) 5860 Valid = true; 5861 goto FinishedParams; 5862 } 5863 5864 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5865 // are allowed as the first parameter to a two-parameter function 5866 if (!(Context.hasSameType(T, Context.CharTy) || 5867 Context.hasSameType(T, Context.WCharTy) || 5868 Context.hasSameType(T, Context.Char16Ty) || 5869 Context.hasSameType(T, Context.Char32Ty))) 5870 goto FinishedParams; 5871 5872 // The second and final parameter must be an std::size_t 5873 T = (*Param)->getType().getUnqualifiedType(); 5874 if (Context.hasSameType(T, Context.getSizeType()) && 5875 ++Param == FnDecl->param_end()) 5876 Valid = true; 5877 } 5878 5879 // FIXME: This diagnostic is absolutely terrible. 5880FinishedParams: 5881 if (!Valid) { 5882 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5883 << FnDecl->getDeclName(); 5884 return true; 5885 } 5886 5887 return false; 5888} 5889 5890/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5891/// linkage specification, including the language and (if present) 5892/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5893/// the location of the language string literal, which is provided 5894/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5895/// the '{' brace. Otherwise, this linkage specification does not 5896/// have any braces. 5897Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5898 SourceLocation ExternLoc, 5899 SourceLocation LangLoc, 5900 llvm::StringRef Lang, 5901 SourceLocation LBraceLoc) { 5902 LinkageSpecDecl::LanguageIDs Language; 5903 if (Lang == "\"C\"") 5904 Language = LinkageSpecDecl::lang_c; 5905 else if (Lang == "\"C++\"") 5906 Language = LinkageSpecDecl::lang_cxx; 5907 else { 5908 Diag(LangLoc, diag::err_bad_language); 5909 return DeclPtrTy(); 5910 } 5911 5912 // FIXME: Add all the various semantics of linkage specifications 5913 5914 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5915 LangLoc, Language, 5916 LBraceLoc.isValid()); 5917 CurContext->addDecl(D); 5918 PushDeclContext(S, D); 5919 return DeclPtrTy::make(D); 5920} 5921 5922/// ActOnFinishLinkageSpecification - Complete the definition of 5923/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5924/// valid, it's the position of the closing '}' brace in a linkage 5925/// specification that uses braces. 5926Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5927 DeclPtrTy LinkageSpec, 5928 SourceLocation RBraceLoc) { 5929 if (LinkageSpec) 5930 PopDeclContext(); 5931 return LinkageSpec; 5932} 5933 5934/// \brief Perform semantic analysis for the variable declaration that 5935/// occurs within a C++ catch clause, returning the newly-created 5936/// variable. 5937VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5938 TypeSourceInfo *TInfo, 5939 IdentifierInfo *Name, 5940 SourceLocation Loc, 5941 SourceRange Range) { 5942 bool Invalid = false; 5943 5944 // Arrays and functions decay. 5945 if (ExDeclType->isArrayType()) 5946 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5947 else if (ExDeclType->isFunctionType()) 5948 ExDeclType = Context.getPointerType(ExDeclType); 5949 5950 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5951 // The exception-declaration shall not denote a pointer or reference to an 5952 // incomplete type, other than [cv] void*. 5953 // N2844 forbids rvalue references. 5954 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5955 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5956 Invalid = true; 5957 } 5958 5959 // GCC allows catching pointers and references to incomplete types 5960 // as an extension; so do we, but we warn by default. 5961 5962 QualType BaseType = ExDeclType; 5963 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5964 unsigned DK = diag::err_catch_incomplete; 5965 bool IncompleteCatchIsInvalid = true; 5966 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5967 BaseType = Ptr->getPointeeType(); 5968 Mode = 1; 5969 DK = diag::ext_catch_incomplete_ptr; 5970 IncompleteCatchIsInvalid = false; 5971 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5972 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5973 BaseType = Ref->getPointeeType(); 5974 Mode = 2; 5975 DK = diag::ext_catch_incomplete_ref; 5976 IncompleteCatchIsInvalid = false; 5977 } 5978 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5979 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5980 IncompleteCatchIsInvalid) 5981 Invalid = true; 5982 5983 if (!Invalid && !ExDeclType->isDependentType() && 5984 RequireNonAbstractType(Loc, ExDeclType, 5985 diag::err_abstract_type_in_decl, 5986 AbstractVariableType)) 5987 Invalid = true; 5988 5989 // Only the non-fragile NeXT runtime currently supports C++ catches 5990 // of ObjC types, and no runtime supports catching ObjC types by value. 5991 if (!Invalid && getLangOptions().ObjC1) { 5992 QualType T = ExDeclType; 5993 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 5994 T = RT->getPointeeType(); 5995 5996 if (T->isObjCObjectType()) { 5997 Diag(Loc, diag::err_objc_object_catch); 5998 Invalid = true; 5999 } else if (T->isObjCObjectPointerType()) { 6000 if (!getLangOptions().NeXTRuntime) { 6001 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6002 Invalid = true; 6003 } else if (!getLangOptions().ObjCNonFragileABI) { 6004 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6005 Invalid = true; 6006 } 6007 } 6008 } 6009 6010 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6011 Name, ExDeclType, TInfo, VarDecl::None, 6012 VarDecl::None); 6013 ExDecl->setExceptionVariable(true); 6014 6015 if (!Invalid) { 6016 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6017 // C++ [except.handle]p16: 6018 // The object declared in an exception-declaration or, if the 6019 // exception-declaration does not specify a name, a temporary (12.2) is 6020 // copy-initialized (8.5) from the exception object. [...] 6021 // The object is destroyed when the handler exits, after the destruction 6022 // of any automatic objects initialized within the handler. 6023 // 6024 // We just pretend to initialize the object with itself, then make sure 6025 // it can be destroyed later. 6026 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6027 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6028 Loc, ExDeclType, 0); 6029 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6030 SourceLocation()); 6031 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6032 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6033 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 6034 if (Result.isInvalid()) 6035 Invalid = true; 6036 else 6037 FinalizeVarWithDestructor(ExDecl, RecordTy); 6038 } 6039 } 6040 6041 if (Invalid) 6042 ExDecl->setInvalidDecl(); 6043 6044 return ExDecl; 6045} 6046 6047/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6048/// handler. 6049Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6050 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6051 QualType ExDeclType = TInfo->getType(); 6052 6053 bool Invalid = D.isInvalidType(); 6054 IdentifierInfo *II = D.getIdentifier(); 6055 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6056 LookupOrdinaryName, 6057 ForRedeclaration)) { 6058 // The scope should be freshly made just for us. There is just no way 6059 // it contains any previous declaration. 6060 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 6061 if (PrevDecl->isTemplateParameter()) { 6062 // Maybe we will complain about the shadowed template parameter. 6063 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6064 } 6065 } 6066 6067 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6068 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6069 << D.getCXXScopeSpec().getRange(); 6070 Invalid = true; 6071 } 6072 6073 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 6074 D.getIdentifier(), 6075 D.getIdentifierLoc(), 6076 D.getDeclSpec().getSourceRange()); 6077 6078 if (Invalid) 6079 ExDecl->setInvalidDecl(); 6080 6081 // Add the exception declaration into this scope. 6082 if (II) 6083 PushOnScopeChains(ExDecl, S); 6084 else 6085 CurContext->addDecl(ExDecl); 6086 6087 ProcessDeclAttributes(S, ExDecl, D); 6088 return DeclPtrTy::make(ExDecl); 6089} 6090 6091Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6092 ExprArg assertexpr, 6093 ExprArg assertmessageexpr) { 6094 Expr *AssertExpr = (Expr *)assertexpr.get(); 6095 StringLiteral *AssertMessage = 6096 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 6097 6098 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6099 llvm::APSInt Value(32); 6100 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6101 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6102 AssertExpr->getSourceRange(); 6103 return DeclPtrTy(); 6104 } 6105 6106 if (Value == 0) { 6107 Diag(AssertLoc, diag::err_static_assert_failed) 6108 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6109 } 6110 } 6111 6112 assertexpr.release(); 6113 assertmessageexpr.release(); 6114 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6115 AssertExpr, AssertMessage); 6116 6117 CurContext->addDecl(Decl); 6118 return DeclPtrTy::make(Decl); 6119} 6120 6121/// \brief Perform semantic analysis of the given friend type declaration. 6122/// 6123/// \returns A friend declaration that. 6124FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6125 TypeSourceInfo *TSInfo) { 6126 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6127 6128 QualType T = TSInfo->getType(); 6129 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6130 6131 if (!getLangOptions().CPlusPlus0x) { 6132 // C++03 [class.friend]p2: 6133 // An elaborated-type-specifier shall be used in a friend declaration 6134 // for a class.* 6135 // 6136 // * The class-key of the elaborated-type-specifier is required. 6137 if (!ActiveTemplateInstantiations.empty()) { 6138 // Do not complain about the form of friend template types during 6139 // template instantiation; we will already have complained when the 6140 // template was declared. 6141 } else if (!T->isElaboratedTypeSpecifier()) { 6142 // If we evaluated the type to a record type, suggest putting 6143 // a tag in front. 6144 if (const RecordType *RT = T->getAs<RecordType>()) { 6145 RecordDecl *RD = RT->getDecl(); 6146 6147 std::string InsertionText = std::string(" ") + RD->getKindName(); 6148 6149 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6150 << (unsigned) RD->getTagKind() 6151 << T 6152 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6153 InsertionText); 6154 } else { 6155 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6156 << T 6157 << SourceRange(FriendLoc, TypeRange.getEnd()); 6158 } 6159 } else if (T->getAs<EnumType>()) { 6160 Diag(FriendLoc, diag::ext_enum_friend) 6161 << T 6162 << SourceRange(FriendLoc, TypeRange.getEnd()); 6163 } 6164 } 6165 6166 // C++0x [class.friend]p3: 6167 // If the type specifier in a friend declaration designates a (possibly 6168 // cv-qualified) class type, that class is declared as a friend; otherwise, 6169 // the friend declaration is ignored. 6170 6171 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6172 // in [class.friend]p3 that we do not implement. 6173 6174 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6175} 6176 6177/// Handle a friend type declaration. This works in tandem with 6178/// ActOnTag. 6179/// 6180/// Notes on friend class templates: 6181/// 6182/// We generally treat friend class declarations as if they were 6183/// declaring a class. So, for example, the elaborated type specifier 6184/// in a friend declaration is required to obey the restrictions of a 6185/// class-head (i.e. no typedefs in the scope chain), template 6186/// parameters are required to match up with simple template-ids, &c. 6187/// However, unlike when declaring a template specialization, it's 6188/// okay to refer to a template specialization without an empty 6189/// template parameter declaration, e.g. 6190/// friend class A<T>::B<unsigned>; 6191/// We permit this as a special case; if there are any template 6192/// parameters present at all, require proper matching, i.e. 6193/// template <> template <class T> friend class A<int>::B; 6194Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6195 MultiTemplateParamsArg TempParams) { 6196 SourceLocation Loc = DS.getSourceRange().getBegin(); 6197 6198 assert(DS.isFriendSpecified()); 6199 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6200 6201 // Try to convert the decl specifier to a type. This works for 6202 // friend templates because ActOnTag never produces a ClassTemplateDecl 6203 // for a TUK_Friend. 6204 Declarator TheDeclarator(DS, Declarator::MemberContext); 6205 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6206 QualType T = TSI->getType(); 6207 if (TheDeclarator.isInvalidType()) 6208 return DeclPtrTy(); 6209 6210 // This is definitely an error in C++98. It's probably meant to 6211 // be forbidden in C++0x, too, but the specification is just 6212 // poorly written. 6213 // 6214 // The problem is with declarations like the following: 6215 // template <T> friend A<T>::foo; 6216 // where deciding whether a class C is a friend or not now hinges 6217 // on whether there exists an instantiation of A that causes 6218 // 'foo' to equal C. There are restrictions on class-heads 6219 // (which we declare (by fiat) elaborated friend declarations to 6220 // be) that makes this tractable. 6221 // 6222 // FIXME: handle "template <> friend class A<T>;", which 6223 // is possibly well-formed? Who even knows? 6224 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6225 Diag(Loc, diag::err_tagless_friend_type_template) 6226 << DS.getSourceRange(); 6227 return DeclPtrTy(); 6228 } 6229 6230 // C++98 [class.friend]p1: A friend of a class is a function 6231 // or class that is not a member of the class . . . 6232 // This is fixed in DR77, which just barely didn't make the C++03 6233 // deadline. It's also a very silly restriction that seriously 6234 // affects inner classes and which nobody else seems to implement; 6235 // thus we never diagnose it, not even in -pedantic. 6236 // 6237 // But note that we could warn about it: it's always useless to 6238 // friend one of your own members (it's not, however, worthless to 6239 // friend a member of an arbitrary specialization of your template). 6240 6241 Decl *D; 6242 if (unsigned NumTempParamLists = TempParams.size()) 6243 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6244 NumTempParamLists, 6245 (TemplateParameterList**) TempParams.release(), 6246 TSI, 6247 DS.getFriendSpecLoc()); 6248 else 6249 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6250 6251 if (!D) 6252 return DeclPtrTy(); 6253 6254 D->setAccess(AS_public); 6255 CurContext->addDecl(D); 6256 6257 return DeclPtrTy::make(D); 6258} 6259 6260Sema::DeclPtrTy 6261Sema::ActOnFriendFunctionDecl(Scope *S, 6262 Declarator &D, 6263 bool IsDefinition, 6264 MultiTemplateParamsArg TemplateParams) { 6265 const DeclSpec &DS = D.getDeclSpec(); 6266 6267 assert(DS.isFriendSpecified()); 6268 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6269 6270 SourceLocation Loc = D.getIdentifierLoc(); 6271 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6272 QualType T = TInfo->getType(); 6273 6274 // C++ [class.friend]p1 6275 // A friend of a class is a function or class.... 6276 // Note that this sees through typedefs, which is intended. 6277 // It *doesn't* see through dependent types, which is correct 6278 // according to [temp.arg.type]p3: 6279 // If a declaration acquires a function type through a 6280 // type dependent on a template-parameter and this causes 6281 // a declaration that does not use the syntactic form of a 6282 // function declarator to have a function type, the program 6283 // is ill-formed. 6284 if (!T->isFunctionType()) { 6285 Diag(Loc, diag::err_unexpected_friend); 6286 6287 // It might be worthwhile to try to recover by creating an 6288 // appropriate declaration. 6289 return DeclPtrTy(); 6290 } 6291 6292 // C++ [namespace.memdef]p3 6293 // - If a friend declaration in a non-local class first declares a 6294 // class or function, the friend class or function is a member 6295 // of the innermost enclosing namespace. 6296 // - The name of the friend is not found by simple name lookup 6297 // until a matching declaration is provided in that namespace 6298 // scope (either before or after the class declaration granting 6299 // friendship). 6300 // - If a friend function is called, its name may be found by the 6301 // name lookup that considers functions from namespaces and 6302 // classes associated with the types of the function arguments. 6303 // - When looking for a prior declaration of a class or a function 6304 // declared as a friend, scopes outside the innermost enclosing 6305 // namespace scope are not considered. 6306 6307 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 6308 DeclarationName Name = GetNameForDeclarator(D); 6309 assert(Name); 6310 6311 // The context we found the declaration in, or in which we should 6312 // create the declaration. 6313 DeclContext *DC; 6314 6315 // FIXME: handle local classes 6316 6317 // Recover from invalid scope qualifiers as if they just weren't there. 6318 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 6319 ForRedeclaration); 6320 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 6321 DC = computeDeclContext(ScopeQual); 6322 6323 // FIXME: handle dependent contexts 6324 if (!DC) return DeclPtrTy(); 6325 if (RequireCompleteDeclContext(ScopeQual, DC)) return DeclPtrTy(); 6326 6327 LookupQualifiedName(Previous, DC); 6328 6329 // Ignore things found implicitly in the wrong scope. 6330 // TODO: better diagnostics for this case. Suggesting the right 6331 // qualified scope would be nice... 6332 LookupResult::Filter F = Previous.makeFilter(); 6333 while (F.hasNext()) { 6334 NamedDecl *D = F.next(); 6335 if (!D->getDeclContext()->getLookupContext()->Equals(DC)) 6336 F.erase(); 6337 } 6338 F.done(); 6339 6340 if (Previous.empty()) { 6341 D.setInvalidType(); 6342 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6343 return DeclPtrTy(); 6344 } 6345 6346 // C++ [class.friend]p1: A friend of a class is a function or 6347 // class that is not a member of the class . . . 6348 if (DC->Equals(CurContext)) 6349 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6350 6351 // Otherwise walk out to the nearest namespace scope looking for matches. 6352 } else { 6353 // TODO: handle local class contexts. 6354 6355 DC = CurContext; 6356 while (true) { 6357 // Skip class contexts. If someone can cite chapter and verse 6358 // for this behavior, that would be nice --- it's what GCC and 6359 // EDG do, and it seems like a reasonable intent, but the spec 6360 // really only says that checks for unqualified existing 6361 // declarations should stop at the nearest enclosing namespace, 6362 // not that they should only consider the nearest enclosing 6363 // namespace. 6364 while (DC->isRecord()) 6365 DC = DC->getParent(); 6366 6367 LookupQualifiedName(Previous, DC); 6368 6369 // TODO: decide what we think about using declarations. 6370 if (!Previous.empty()) 6371 break; 6372 6373 if (DC->isFileContext()) break; 6374 DC = DC->getParent(); 6375 } 6376 6377 // C++ [class.friend]p1: A friend of a class is a function or 6378 // class that is not a member of the class . . . 6379 // C++0x changes this for both friend types and functions. 6380 // Most C++ 98 compilers do seem to give an error here, so 6381 // we do, too. 6382 if (!Previous.empty() && DC->Equals(CurContext) 6383 && !getLangOptions().CPlusPlus0x) 6384 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6385 } 6386 6387 if (DC->isFileContext()) { 6388 // This implies that it has to be an operator or function. 6389 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6390 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6391 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6392 Diag(Loc, diag::err_introducing_special_friend) << 6393 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6394 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6395 return DeclPtrTy(); 6396 } 6397 } 6398 6399 bool Redeclaration = false; 6400 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 6401 move(TemplateParams), 6402 IsDefinition, 6403 Redeclaration); 6404 if (!ND) return DeclPtrTy(); 6405 6406 assert(ND->getDeclContext() == DC); 6407 assert(ND->getLexicalDeclContext() == CurContext); 6408 6409 // Add the function declaration to the appropriate lookup tables, 6410 // adjusting the redeclarations list as necessary. We don't 6411 // want to do this yet if the friending class is dependent. 6412 // 6413 // Also update the scope-based lookup if the target context's 6414 // lookup context is in lexical scope. 6415 if (!CurContext->isDependentContext()) { 6416 DC = DC->getLookupContext(); 6417 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6418 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6419 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6420 } 6421 6422 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6423 D.getIdentifierLoc(), ND, 6424 DS.getFriendSpecLoc()); 6425 FrD->setAccess(AS_public); 6426 CurContext->addDecl(FrD); 6427 6428 return DeclPtrTy::make(ND); 6429} 6430 6431void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 6432 AdjustDeclIfTemplate(dcl); 6433 6434 Decl *Dcl = dcl.getAs<Decl>(); 6435 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6436 if (!Fn) { 6437 Diag(DelLoc, diag::err_deleted_non_function); 6438 return; 6439 } 6440 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6441 Diag(DelLoc, diag::err_deleted_decl_not_first); 6442 Diag(Prev->getLocation(), diag::note_previous_declaration); 6443 // If the declaration wasn't the first, we delete the function anyway for 6444 // recovery. 6445 } 6446 Fn->setDeleted(); 6447} 6448 6449static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6450 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6451 ++CI) { 6452 Stmt *SubStmt = *CI; 6453 if (!SubStmt) 6454 continue; 6455 if (isa<ReturnStmt>(SubStmt)) 6456 Self.Diag(SubStmt->getSourceRange().getBegin(), 6457 diag::err_return_in_constructor_handler); 6458 if (!isa<Expr>(SubStmt)) 6459 SearchForReturnInStmt(Self, SubStmt); 6460 } 6461} 6462 6463void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6464 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6465 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6466 SearchForReturnInStmt(*this, Handler); 6467 } 6468} 6469 6470bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6471 const CXXMethodDecl *Old) { 6472 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6473 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6474 6475 if (Context.hasSameType(NewTy, OldTy) || 6476 NewTy->isDependentType() || OldTy->isDependentType()) 6477 return false; 6478 6479 // Check if the return types are covariant 6480 QualType NewClassTy, OldClassTy; 6481 6482 /// Both types must be pointers or references to classes. 6483 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6484 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6485 NewClassTy = NewPT->getPointeeType(); 6486 OldClassTy = OldPT->getPointeeType(); 6487 } 6488 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6489 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6490 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6491 NewClassTy = NewRT->getPointeeType(); 6492 OldClassTy = OldRT->getPointeeType(); 6493 } 6494 } 6495 } 6496 6497 // The return types aren't either both pointers or references to a class type. 6498 if (NewClassTy.isNull()) { 6499 Diag(New->getLocation(), 6500 diag::err_different_return_type_for_overriding_virtual_function) 6501 << New->getDeclName() << NewTy << OldTy; 6502 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6503 6504 return true; 6505 } 6506 6507 // C++ [class.virtual]p6: 6508 // If the return type of D::f differs from the return type of B::f, the 6509 // class type in the return type of D::f shall be complete at the point of 6510 // declaration of D::f or shall be the class type D. 6511 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6512 if (!RT->isBeingDefined() && 6513 RequireCompleteType(New->getLocation(), NewClassTy, 6514 PDiag(diag::err_covariant_return_incomplete) 6515 << New->getDeclName())) 6516 return true; 6517 } 6518 6519 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6520 // Check if the new class derives from the old class. 6521 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6522 Diag(New->getLocation(), 6523 diag::err_covariant_return_not_derived) 6524 << New->getDeclName() << NewTy << OldTy; 6525 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6526 return true; 6527 } 6528 6529 // Check if we the conversion from derived to base is valid. 6530 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6531 diag::err_covariant_return_inaccessible_base, 6532 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6533 // FIXME: Should this point to the return type? 6534 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6535 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6536 return true; 6537 } 6538 } 6539 6540 // The qualifiers of the return types must be the same. 6541 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6542 Diag(New->getLocation(), 6543 diag::err_covariant_return_type_different_qualifications) 6544 << New->getDeclName() << NewTy << OldTy; 6545 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6546 return true; 6547 }; 6548 6549 6550 // The new class type must have the same or less qualifiers as the old type. 6551 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6552 Diag(New->getLocation(), 6553 diag::err_covariant_return_type_class_type_more_qualified) 6554 << New->getDeclName() << NewTy << OldTy; 6555 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6556 return true; 6557 }; 6558 6559 return false; 6560} 6561 6562bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6563 const CXXMethodDecl *Old) 6564{ 6565 if (Old->hasAttr<FinalAttr>()) { 6566 Diag(New->getLocation(), diag::err_final_function_overridden) 6567 << New->getDeclName(); 6568 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6569 return true; 6570 } 6571 6572 return false; 6573} 6574 6575/// \brief Mark the given method pure. 6576/// 6577/// \param Method the method to be marked pure. 6578/// 6579/// \param InitRange the source range that covers the "0" initializer. 6580bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6581 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6582 Method->setPure(); 6583 6584 // A class is abstract if at least one function is pure virtual. 6585 Method->getParent()->setAbstract(true); 6586 return false; 6587 } 6588 6589 if (!Method->isInvalidDecl()) 6590 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6591 << Method->getDeclName() << InitRange; 6592 return true; 6593} 6594 6595/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6596/// an initializer for the out-of-line declaration 'Dcl'. The scope 6597/// is a fresh scope pushed for just this purpose. 6598/// 6599/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6600/// static data member of class X, names should be looked up in the scope of 6601/// class X. 6602void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6603 // If there is no declaration, there was an error parsing it. 6604 Decl *D = Dcl.getAs<Decl>(); 6605 if (D == 0) return; 6606 6607 // We should only get called for declarations with scope specifiers, like: 6608 // int foo::bar; 6609 assert(D->isOutOfLine()); 6610 EnterDeclaratorContext(S, D->getDeclContext()); 6611} 6612 6613/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6614/// initializer for the out-of-line declaration 'Dcl'. 6615void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6616 // If there is no declaration, there was an error parsing it. 6617 Decl *D = Dcl.getAs<Decl>(); 6618 if (D == 0) return; 6619 6620 assert(D->isOutOfLine()); 6621 ExitDeclaratorContext(S); 6622} 6623 6624/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6625/// C++ if/switch/while/for statement. 6626/// e.g: "if (int x = f()) {...}" 6627Action::DeclResult 6628Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6629 // C++ 6.4p2: 6630 // The declarator shall not specify a function or an array. 6631 // The type-specifier-seq shall not contain typedef and shall not declare a 6632 // new class or enumeration. 6633 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6634 "Parser allowed 'typedef' as storage class of condition decl."); 6635 6636 TagDecl *OwnedTag = 0; 6637 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6638 QualType Ty = TInfo->getType(); 6639 6640 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6641 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6642 // would be created and CXXConditionDeclExpr wants a VarDecl. 6643 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6644 << D.getSourceRange(); 6645 return DeclResult(); 6646 } else if (OwnedTag && OwnedTag->isDefinition()) { 6647 // The type-specifier-seq shall not declare a new class or enumeration. 6648 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6649 } 6650 6651 DeclPtrTy Dcl = ActOnDeclarator(S, D); 6652 if (!Dcl) 6653 return DeclResult(); 6654 6655 return Dcl; 6656} 6657 6658void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6659 bool DefinitionRequired) { 6660 // Ignore any vtable uses in unevaluated operands or for classes that do 6661 // not have a vtable. 6662 if (!Class->isDynamicClass() || Class->isDependentContext() || 6663 CurContext->isDependentContext() || 6664 ExprEvalContexts.back().Context == Unevaluated) 6665 return; 6666 6667 // Try to insert this class into the map. 6668 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6669 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6670 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6671 if (!Pos.second) { 6672 // If we already had an entry, check to see if we are promoting this vtable 6673 // to required a definition. If so, we need to reappend to the VTableUses 6674 // list, since we may have already processed the first entry. 6675 if (DefinitionRequired && !Pos.first->second) { 6676 Pos.first->second = true; 6677 } else { 6678 // Otherwise, we can early exit. 6679 return; 6680 } 6681 } 6682 6683 // Local classes need to have their virtual members marked 6684 // immediately. For all other classes, we mark their virtual members 6685 // at the end of the translation unit. 6686 if (Class->isLocalClass()) 6687 MarkVirtualMembersReferenced(Loc, Class); 6688 else 6689 VTableUses.push_back(std::make_pair(Class, Loc)); 6690} 6691 6692bool Sema::DefineUsedVTables() { 6693 // If any dynamic classes have their key function defined within 6694 // this translation unit, then those vtables are considered "used" and must 6695 // be emitted. 6696 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6697 if (const CXXMethodDecl *KeyFunction 6698 = Context.getKeyFunction(DynamicClasses[I])) { 6699 const FunctionDecl *Definition = 0; 6700 if (KeyFunction->hasBody(Definition)) 6701 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6702 } 6703 } 6704 6705 if (VTableUses.empty()) 6706 return false; 6707 6708 // Note: The VTableUses vector could grow as a result of marking 6709 // the members of a class as "used", so we check the size each 6710 // time through the loop and prefer indices (with are stable) to 6711 // iterators (which are not). 6712 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6713 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6714 if (!Class) 6715 continue; 6716 6717 SourceLocation Loc = VTableUses[I].second; 6718 6719 // If this class has a key function, but that key function is 6720 // defined in another translation unit, we don't need to emit the 6721 // vtable even though we're using it. 6722 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6723 if (KeyFunction && !KeyFunction->hasBody()) { 6724 switch (KeyFunction->getTemplateSpecializationKind()) { 6725 case TSK_Undeclared: 6726 case TSK_ExplicitSpecialization: 6727 case TSK_ExplicitInstantiationDeclaration: 6728 // The key function is in another translation unit. 6729 continue; 6730 6731 case TSK_ExplicitInstantiationDefinition: 6732 case TSK_ImplicitInstantiation: 6733 // We will be instantiating the key function. 6734 break; 6735 } 6736 } else if (!KeyFunction) { 6737 // If we have a class with no key function that is the subject 6738 // of an explicit instantiation declaration, suppress the 6739 // vtable; it will live with the explicit instantiation 6740 // definition. 6741 bool IsExplicitInstantiationDeclaration 6742 = Class->getTemplateSpecializationKind() 6743 == TSK_ExplicitInstantiationDeclaration; 6744 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6745 REnd = Class->redecls_end(); 6746 R != REnd; ++R) { 6747 TemplateSpecializationKind TSK 6748 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6749 if (TSK == TSK_ExplicitInstantiationDeclaration) 6750 IsExplicitInstantiationDeclaration = true; 6751 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6752 IsExplicitInstantiationDeclaration = false; 6753 break; 6754 } 6755 } 6756 6757 if (IsExplicitInstantiationDeclaration) 6758 continue; 6759 } 6760 6761 // Mark all of the virtual members of this class as referenced, so 6762 // that we can build a vtable. Then, tell the AST consumer that a 6763 // vtable for this class is required. 6764 MarkVirtualMembersReferenced(Loc, Class); 6765 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6766 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6767 6768 // Optionally warn if we're emitting a weak vtable. 6769 if (Class->getLinkage() == ExternalLinkage && 6770 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6771 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 6772 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6773 } 6774 } 6775 VTableUses.clear(); 6776 6777 return true; 6778} 6779 6780void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6781 const CXXRecordDecl *RD) { 6782 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6783 e = RD->method_end(); i != e; ++i) { 6784 CXXMethodDecl *MD = *i; 6785 6786 // C++ [basic.def.odr]p2: 6787 // [...] A virtual member function is used if it is not pure. [...] 6788 if (MD->isVirtual() && !MD->isPure()) 6789 MarkDeclarationReferenced(Loc, MD); 6790 } 6791 6792 // Only classes that have virtual bases need a VTT. 6793 if (RD->getNumVBases() == 0) 6794 return; 6795 6796 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6797 e = RD->bases_end(); i != e; ++i) { 6798 const CXXRecordDecl *Base = 6799 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6800 if (Base->getNumVBases() == 0) 6801 continue; 6802 MarkVirtualMembersReferenced(Loc, Base); 6803 } 6804} 6805 6806/// SetIvarInitializers - This routine builds initialization ASTs for the 6807/// Objective-C implementation whose ivars need be initialized. 6808void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6809 if (!getLangOptions().CPlusPlus) 6810 return; 6811 if (const ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6812 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6813 CollectIvarsToConstructOrDestruct(OID, ivars); 6814 if (ivars.empty()) 6815 return; 6816 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6817 for (unsigned i = 0; i < ivars.size(); i++) { 6818 FieldDecl *Field = ivars[i]; 6819 if (Field->isInvalidDecl()) 6820 continue; 6821 6822 CXXBaseOrMemberInitializer *Member; 6823 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6824 InitializationKind InitKind = 6825 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6826 6827 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6828 Sema::OwningExprResult MemberInit = 6829 InitSeq.Perform(*this, InitEntity, InitKind, 6830 Sema::MultiExprArg(*this, 0, 0)); 6831 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 6832 // Note, MemberInit could actually come back empty if no initialization 6833 // is required (e.g., because it would call a trivial default constructor) 6834 if (!MemberInit.get() || MemberInit.isInvalid()) 6835 continue; 6836 6837 Member = 6838 new (Context) CXXBaseOrMemberInitializer(Context, 6839 Field, SourceLocation(), 6840 SourceLocation(), 6841 MemberInit.takeAs<Expr>(), 6842 SourceLocation()); 6843 AllToInit.push_back(Member); 6844 6845 // Be sure that the destructor is accessible and is marked as referenced. 6846 if (const RecordType *RecordTy 6847 = Context.getBaseElementType(Field->getType()) 6848 ->getAs<RecordType>()) { 6849 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6850 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 6851 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6852 CheckDestructorAccess(Field->getLocation(), Destructor, 6853 PDiag(diag::err_access_dtor_ivar) 6854 << Context.getBaseElementType(Field->getType())); 6855 } 6856 } 6857 } 6858 ObjCImplementation->setIvarInitializers(Context, 6859 AllToInit.data(), AllToInit.size()); 6860 } 6861} 6862