SemaDeclCXX.cpp revision 0f2b97d1b0bfbcec727a386dc9e5cf06051cb29b
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 if (!Param->hasUnparsedDefaultArg()) 416 Param->getDefaultArg()->Destroy(Context); 417 Param->setDefaultArg(0); 418 } 419 } 420 } 421} 422 423/// isCurrentClassName - Determine whether the identifier II is the 424/// name of the class type currently being defined. In the case of 425/// nested classes, this will only return true if II is the name of 426/// the innermost class. 427bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 428 const CXXScopeSpec *SS) { 429 assert(getLangOptions().CPlusPlus && "No class names in C!"); 430 431 CXXRecordDecl *CurDecl; 432 if (SS && SS->isSet() && !SS->isInvalid()) { 433 DeclContext *DC = computeDeclContext(*SS, true); 434 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 435 } else 436 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 437 438 if (CurDecl && CurDecl->getIdentifier()) 439 return &II == CurDecl->getIdentifier(); 440 else 441 return false; 442} 443 444/// \brief Check the validity of a C++ base class specifier. 445/// 446/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 447/// and returns NULL otherwise. 448CXXBaseSpecifier * 449Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 450 SourceRange SpecifierRange, 451 bool Virtual, AccessSpecifier Access, 452 QualType BaseType, 453 SourceLocation BaseLoc) { 454 // C++ [class.union]p1: 455 // A union shall not have base classes. 456 if (Class->isUnion()) { 457 Diag(Class->getLocation(), diag::err_base_clause_on_union) 458 << SpecifierRange; 459 return 0; 460 } 461 462 if (BaseType->isDependentType()) 463 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 464 Class->getTagKind() == TTK_Class, 465 Access, BaseType); 466 467 // Base specifiers must be record types. 468 if (!BaseType->isRecordType()) { 469 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 470 return 0; 471 } 472 473 // C++ [class.union]p1: 474 // A union shall not be used as a base class. 475 if (BaseType->isUnionType()) { 476 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 477 return 0; 478 } 479 480 // C++ [class.derived]p2: 481 // The class-name in a base-specifier shall not be an incompletely 482 // defined class. 483 if (RequireCompleteType(BaseLoc, BaseType, 484 PDiag(diag::err_incomplete_base_class) 485 << SpecifierRange)) 486 return 0; 487 488 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 489 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 490 assert(BaseDecl && "Record type has no declaration"); 491 BaseDecl = BaseDecl->getDefinition(); 492 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 493 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 494 assert(CXXBaseDecl && "Base type is not a C++ type"); 495 496 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 497 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 498 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 499 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 500 << BaseType; 501 return 0; 502 } 503 504 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 505 506 // Create the base specifier. 507 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 508 Class->getTagKind() == TTK_Class, 509 Access, BaseType); 510} 511 512void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 513 const CXXRecordDecl *BaseClass, 514 bool BaseIsVirtual) { 515 // A class with a non-empty base class is not empty. 516 // FIXME: Standard ref? 517 if (!BaseClass->isEmpty()) 518 Class->setEmpty(false); 519 520 // C++ [class.virtual]p1: 521 // A class that [...] inherits a virtual function is called a polymorphic 522 // class. 523 if (BaseClass->isPolymorphic()) 524 Class->setPolymorphic(true); 525 526 // C++ [dcl.init.aggr]p1: 527 // An aggregate is [...] a class with [...] no base classes [...]. 528 Class->setAggregate(false); 529 530 // C++ [class]p4: 531 // A POD-struct is an aggregate class... 532 Class->setPOD(false); 533 534 if (BaseIsVirtual) { 535 // C++ [class.ctor]p5: 536 // A constructor is trivial if its class has no virtual base classes. 537 Class->setHasTrivialConstructor(false); 538 539 // C++ [class.copy]p6: 540 // A copy constructor is trivial if its class has no virtual base classes. 541 Class->setHasTrivialCopyConstructor(false); 542 543 // C++ [class.copy]p11: 544 // A copy assignment operator is trivial if its class has no virtual 545 // base classes. 546 Class->setHasTrivialCopyAssignment(false); 547 548 // C++0x [meta.unary.prop] is_empty: 549 // T is a class type, but not a union type, with ... no virtual base 550 // classes 551 Class->setEmpty(false); 552 } else { 553 // C++ [class.ctor]p5: 554 // A constructor is trivial if all the direct base classes of its 555 // class have trivial constructors. 556 if (!BaseClass->hasTrivialConstructor()) 557 Class->setHasTrivialConstructor(false); 558 559 // C++ [class.copy]p6: 560 // A copy constructor is trivial if all the direct base classes of its 561 // class have trivial copy constructors. 562 if (!BaseClass->hasTrivialCopyConstructor()) 563 Class->setHasTrivialCopyConstructor(false); 564 565 // C++ [class.copy]p11: 566 // A copy assignment operator is trivial if all the direct base classes 567 // of its class have trivial copy assignment operators. 568 if (!BaseClass->hasTrivialCopyAssignment()) 569 Class->setHasTrivialCopyAssignment(false); 570 } 571 572 // C++ [class.ctor]p3: 573 // A destructor is trivial if all the direct base classes of its class 574 // have trivial destructors. 575 if (!BaseClass->hasTrivialDestructor()) 576 Class->setHasTrivialDestructor(false); 577} 578 579/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 580/// one entry in the base class list of a class specifier, for 581/// example: 582/// class foo : public bar, virtual private baz { 583/// 'public bar' and 'virtual private baz' are each base-specifiers. 584Sema::BaseResult 585Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 586 bool Virtual, AccessSpecifier Access, 587 TypeTy *basetype, SourceLocation BaseLoc) { 588 if (!classdecl) 589 return true; 590 591 AdjustDeclIfTemplate(classdecl); 592 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 593 if (!Class) 594 return true; 595 596 QualType BaseType = GetTypeFromParser(basetype); 597 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 598 Virtual, Access, 599 BaseType, BaseLoc)) 600 return BaseSpec; 601 602 return true; 603} 604 605/// \brief Performs the actual work of attaching the given base class 606/// specifiers to a C++ class. 607bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 608 unsigned NumBases) { 609 if (NumBases == 0) 610 return false; 611 612 // Used to keep track of which base types we have already seen, so 613 // that we can properly diagnose redundant direct base types. Note 614 // that the key is always the unqualified canonical type of the base 615 // class. 616 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 617 618 // Copy non-redundant base specifiers into permanent storage. 619 unsigned NumGoodBases = 0; 620 bool Invalid = false; 621 for (unsigned idx = 0; idx < NumBases; ++idx) { 622 QualType NewBaseType 623 = Context.getCanonicalType(Bases[idx]->getType()); 624 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 625 if (!Class->hasObjectMember()) { 626 if (const RecordType *FDTTy = 627 NewBaseType.getTypePtr()->getAs<RecordType>()) 628 if (FDTTy->getDecl()->hasObjectMember()) 629 Class->setHasObjectMember(true); 630 } 631 632 if (KnownBaseTypes[NewBaseType]) { 633 // C++ [class.mi]p3: 634 // A class shall not be specified as a direct base class of a 635 // derived class more than once. 636 Diag(Bases[idx]->getSourceRange().getBegin(), 637 diag::err_duplicate_base_class) 638 << KnownBaseTypes[NewBaseType]->getType() 639 << Bases[idx]->getSourceRange(); 640 641 // Delete the duplicate base class specifier; we're going to 642 // overwrite its pointer later. 643 Context.Deallocate(Bases[idx]); 644 645 Invalid = true; 646 } else { 647 // Okay, add this new base class. 648 KnownBaseTypes[NewBaseType] = Bases[idx]; 649 Bases[NumGoodBases++] = Bases[idx]; 650 } 651 } 652 653 // Attach the remaining base class specifiers to the derived class. 654 Class->setBases(Bases, NumGoodBases); 655 656 // Delete the remaining (good) base class specifiers, since their 657 // data has been copied into the CXXRecordDecl. 658 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 659 Context.Deallocate(Bases[idx]); 660 661 return Invalid; 662} 663 664/// ActOnBaseSpecifiers - Attach the given base specifiers to the 665/// class, after checking whether there are any duplicate base 666/// classes. 667void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 668 unsigned NumBases) { 669 if (!ClassDecl || !Bases || !NumBases) 670 return; 671 672 AdjustDeclIfTemplate(ClassDecl); 673 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 674 (CXXBaseSpecifier**)(Bases), NumBases); 675} 676 677static CXXRecordDecl *GetClassForType(QualType T) { 678 if (const RecordType *RT = T->getAs<RecordType>()) 679 return cast<CXXRecordDecl>(RT->getDecl()); 680 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 681 return ICT->getDecl(); 682 else 683 return 0; 684} 685 686/// \brief Determine whether the type \p Derived is a C++ class that is 687/// derived from the type \p Base. 688bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 689 if (!getLangOptions().CPlusPlus) 690 return false; 691 692 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 693 if (!DerivedRD) 694 return false; 695 696 CXXRecordDecl *BaseRD = GetClassForType(Base); 697 if (!BaseRD) 698 return false; 699 700 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 701 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 702} 703 704/// \brief Determine whether the type \p Derived is a C++ class that is 705/// derived from the type \p Base. 706bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 707 if (!getLangOptions().CPlusPlus) 708 return false; 709 710 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 711 if (!DerivedRD) 712 return false; 713 714 CXXRecordDecl *BaseRD = GetClassForType(Base); 715 if (!BaseRD) 716 return false; 717 718 return DerivedRD->isDerivedFrom(BaseRD, Paths); 719} 720 721void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 722 CXXBaseSpecifierArray &BasePathArray) { 723 assert(BasePathArray.empty() && "Base path array must be empty!"); 724 assert(Paths.isRecordingPaths() && "Must record paths!"); 725 726 const CXXBasePath &Path = Paths.front(); 727 728 // We first go backward and check if we have a virtual base. 729 // FIXME: It would be better if CXXBasePath had the base specifier for 730 // the nearest virtual base. 731 unsigned Start = 0; 732 for (unsigned I = Path.size(); I != 0; --I) { 733 if (Path[I - 1].Base->isVirtual()) { 734 Start = I - 1; 735 break; 736 } 737 } 738 739 // Now add all bases. 740 for (unsigned I = Start, E = Path.size(); I != E; ++I) 741 BasePathArray.push_back(Path[I].Base); 742} 743 744/// \brief Determine whether the given base path includes a virtual 745/// base class. 746bool Sema::BasePathInvolvesVirtualBase(const CXXBaseSpecifierArray &BasePath) { 747 for (CXXBaseSpecifierArray::iterator B = BasePath.begin(), 748 BEnd = BasePath.end(); 749 B != BEnd; ++B) 750 if ((*B)->isVirtual()) 751 return true; 752 753 return false; 754} 755 756/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 757/// conversion (where Derived and Base are class types) is 758/// well-formed, meaning that the conversion is unambiguous (and 759/// that all of the base classes are accessible). Returns true 760/// and emits a diagnostic if the code is ill-formed, returns false 761/// otherwise. Loc is the location where this routine should point to 762/// if there is an error, and Range is the source range to highlight 763/// if there is an error. 764bool 765Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 766 unsigned InaccessibleBaseID, 767 unsigned AmbigiousBaseConvID, 768 SourceLocation Loc, SourceRange Range, 769 DeclarationName Name, 770 CXXBaseSpecifierArray *BasePath) { 771 // First, determine whether the path from Derived to Base is 772 // ambiguous. This is slightly more expensive than checking whether 773 // the Derived to Base conversion exists, because here we need to 774 // explore multiple paths to determine if there is an ambiguity. 775 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 776 /*DetectVirtual=*/false); 777 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 778 assert(DerivationOkay && 779 "Can only be used with a derived-to-base conversion"); 780 (void)DerivationOkay; 781 782 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 783 if (InaccessibleBaseID) { 784 // Check that the base class can be accessed. 785 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 786 InaccessibleBaseID)) { 787 case AR_inaccessible: 788 return true; 789 case AR_accessible: 790 case AR_dependent: 791 case AR_delayed: 792 break; 793 } 794 } 795 796 // Build a base path if necessary. 797 if (BasePath) 798 BuildBasePathArray(Paths, *BasePath); 799 return false; 800 } 801 802 // We know that the derived-to-base conversion is ambiguous, and 803 // we're going to produce a diagnostic. Perform the derived-to-base 804 // search just one more time to compute all of the possible paths so 805 // that we can print them out. This is more expensive than any of 806 // the previous derived-to-base checks we've done, but at this point 807 // performance isn't as much of an issue. 808 Paths.clear(); 809 Paths.setRecordingPaths(true); 810 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 811 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 812 (void)StillOkay; 813 814 // Build up a textual representation of the ambiguous paths, e.g., 815 // D -> B -> A, that will be used to illustrate the ambiguous 816 // conversions in the diagnostic. We only print one of the paths 817 // to each base class subobject. 818 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 819 820 Diag(Loc, AmbigiousBaseConvID) 821 << Derived << Base << PathDisplayStr << Range << Name; 822 return true; 823} 824 825bool 826Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 827 SourceLocation Loc, SourceRange Range, 828 CXXBaseSpecifierArray *BasePath, 829 bool IgnoreAccess) { 830 return CheckDerivedToBaseConversion(Derived, Base, 831 IgnoreAccess ? 0 832 : diag::err_upcast_to_inaccessible_base, 833 diag::err_ambiguous_derived_to_base_conv, 834 Loc, Range, DeclarationName(), 835 BasePath); 836} 837 838 839/// @brief Builds a string representing ambiguous paths from a 840/// specific derived class to different subobjects of the same base 841/// class. 842/// 843/// This function builds a string that can be used in error messages 844/// to show the different paths that one can take through the 845/// inheritance hierarchy to go from the derived class to different 846/// subobjects of a base class. The result looks something like this: 847/// @code 848/// struct D -> struct B -> struct A 849/// struct D -> struct C -> struct A 850/// @endcode 851std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 852 std::string PathDisplayStr; 853 std::set<unsigned> DisplayedPaths; 854 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 855 Path != Paths.end(); ++Path) { 856 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 857 // We haven't displayed a path to this particular base 858 // class subobject yet. 859 PathDisplayStr += "\n "; 860 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 861 for (CXXBasePath::const_iterator Element = Path->begin(); 862 Element != Path->end(); ++Element) 863 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 864 } 865 } 866 867 return PathDisplayStr; 868} 869 870//===----------------------------------------------------------------------===// 871// C++ class member Handling 872//===----------------------------------------------------------------------===// 873 874/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 875Sema::DeclPtrTy 876Sema::ActOnAccessSpecifier(AccessSpecifier Access, 877 SourceLocation ASLoc, SourceLocation ColonLoc) { 878 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 879 AccessSpecDecl* ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 880 ASLoc, ColonLoc); 881 CurContext->addHiddenDecl(ASDecl); 882 return DeclPtrTy::make(ASDecl); 883} 884 885/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 886/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 887/// bitfield width if there is one and 'InitExpr' specifies the initializer if 888/// any. 889Sema::DeclPtrTy 890Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 891 MultiTemplateParamsArg TemplateParameterLists, 892 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 893 bool Deleted) { 894 const DeclSpec &DS = D.getDeclSpec(); 895 DeclarationName Name = GetNameForDeclarator(D); 896 Expr *BitWidth = static_cast<Expr*>(BW); 897 Expr *Init = static_cast<Expr*>(InitExpr); 898 SourceLocation Loc = D.getIdentifierLoc(); 899 900 assert(isa<CXXRecordDecl>(CurContext)); 901 assert(!DS.isFriendSpecified()); 902 903 bool isFunc = false; 904 if (D.isFunctionDeclarator()) 905 isFunc = true; 906 else if (D.getNumTypeObjects() == 0 && 907 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 908 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 909 isFunc = TDType->isFunctionType(); 910 } 911 912 // C++ 9.2p6: A member shall not be declared to have automatic storage 913 // duration (auto, register) or with the extern storage-class-specifier. 914 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 915 // data members and cannot be applied to names declared const or static, 916 // and cannot be applied to reference members. 917 switch (DS.getStorageClassSpec()) { 918 case DeclSpec::SCS_unspecified: 919 case DeclSpec::SCS_typedef: 920 case DeclSpec::SCS_static: 921 // FALL THROUGH. 922 break; 923 case DeclSpec::SCS_mutable: 924 if (isFunc) { 925 if (DS.getStorageClassSpecLoc().isValid()) 926 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 927 else 928 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 929 930 // FIXME: It would be nicer if the keyword was ignored only for this 931 // declarator. Otherwise we could get follow-up errors. 932 D.getMutableDeclSpec().ClearStorageClassSpecs(); 933 } 934 break; 935 default: 936 if (DS.getStorageClassSpecLoc().isValid()) 937 Diag(DS.getStorageClassSpecLoc(), 938 diag::err_storageclass_invalid_for_member); 939 else 940 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 941 D.getMutableDeclSpec().ClearStorageClassSpecs(); 942 } 943 944 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 945 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 946 !isFunc); 947 948 Decl *Member; 949 if (isInstField) { 950 // FIXME: Check for template parameters! 951 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 952 AS); 953 assert(Member && "HandleField never returns null"); 954 } else { 955 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 956 .getAs<Decl>(); 957 if (!Member) { 958 if (BitWidth) DeleteExpr(BitWidth); 959 return DeclPtrTy(); 960 } 961 962 // Non-instance-fields can't have a bitfield. 963 if (BitWidth) { 964 if (Member->isInvalidDecl()) { 965 // don't emit another diagnostic. 966 } else if (isa<VarDecl>(Member)) { 967 // C++ 9.6p3: A bit-field shall not be a static member. 968 // "static member 'A' cannot be a bit-field" 969 Diag(Loc, diag::err_static_not_bitfield) 970 << Name << BitWidth->getSourceRange(); 971 } else if (isa<TypedefDecl>(Member)) { 972 // "typedef member 'x' cannot be a bit-field" 973 Diag(Loc, diag::err_typedef_not_bitfield) 974 << Name << BitWidth->getSourceRange(); 975 } else { 976 // A function typedef ("typedef int f(); f a;"). 977 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 978 Diag(Loc, diag::err_not_integral_type_bitfield) 979 << Name << cast<ValueDecl>(Member)->getType() 980 << BitWidth->getSourceRange(); 981 } 982 983 DeleteExpr(BitWidth); 984 BitWidth = 0; 985 Member->setInvalidDecl(); 986 } 987 988 Member->setAccess(AS); 989 990 // If we have declared a member function template, set the access of the 991 // templated declaration as well. 992 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 993 FunTmpl->getTemplatedDecl()->setAccess(AS); 994 } 995 996 assert((Name || isInstField) && "No identifier for non-field ?"); 997 998 if (Init) 999 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 1000 if (Deleted) // FIXME: Source location is not very good. 1001 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 1002 1003 if (isInstField) { 1004 FieldCollector->Add(cast<FieldDecl>(Member)); 1005 return DeclPtrTy(); 1006 } 1007 return DeclPtrTy::make(Member); 1008} 1009 1010/// \brief Find the direct and/or virtual base specifiers that 1011/// correspond to the given base type, for use in base initialization 1012/// within a constructor. 1013static bool FindBaseInitializer(Sema &SemaRef, 1014 CXXRecordDecl *ClassDecl, 1015 QualType BaseType, 1016 const CXXBaseSpecifier *&DirectBaseSpec, 1017 const CXXBaseSpecifier *&VirtualBaseSpec) { 1018 // First, check for a direct base class. 1019 DirectBaseSpec = 0; 1020 for (CXXRecordDecl::base_class_const_iterator Base 1021 = ClassDecl->bases_begin(); 1022 Base != ClassDecl->bases_end(); ++Base) { 1023 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1024 // We found a direct base of this type. That's what we're 1025 // initializing. 1026 DirectBaseSpec = &*Base; 1027 break; 1028 } 1029 } 1030 1031 // Check for a virtual base class. 1032 // FIXME: We might be able to short-circuit this if we know in advance that 1033 // there are no virtual bases. 1034 VirtualBaseSpec = 0; 1035 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1036 // We haven't found a base yet; search the class hierarchy for a 1037 // virtual base class. 1038 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1039 /*DetectVirtual=*/false); 1040 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1041 BaseType, Paths)) { 1042 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1043 Path != Paths.end(); ++Path) { 1044 if (Path->back().Base->isVirtual()) { 1045 VirtualBaseSpec = Path->back().Base; 1046 break; 1047 } 1048 } 1049 } 1050 } 1051 1052 return DirectBaseSpec || VirtualBaseSpec; 1053} 1054 1055/// ActOnMemInitializer - Handle a C++ member initializer. 1056Sema::MemInitResult 1057Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1058 Scope *S, 1059 CXXScopeSpec &SS, 1060 IdentifierInfo *MemberOrBase, 1061 TypeTy *TemplateTypeTy, 1062 SourceLocation IdLoc, 1063 SourceLocation LParenLoc, 1064 ExprTy **Args, unsigned NumArgs, 1065 SourceLocation *CommaLocs, 1066 SourceLocation RParenLoc) { 1067 if (!ConstructorD) 1068 return true; 1069 1070 AdjustDeclIfTemplate(ConstructorD); 1071 1072 CXXConstructorDecl *Constructor 1073 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1074 if (!Constructor) { 1075 // The user wrote a constructor initializer on a function that is 1076 // not a C++ constructor. Ignore the error for now, because we may 1077 // have more member initializers coming; we'll diagnose it just 1078 // once in ActOnMemInitializers. 1079 return true; 1080 } 1081 1082 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1083 1084 // C++ [class.base.init]p2: 1085 // Names in a mem-initializer-id are looked up in the scope of the 1086 // constructor’s class and, if not found in that scope, are looked 1087 // up in the scope containing the constructor’s 1088 // definition. [Note: if the constructor’s class contains a member 1089 // with the same name as a direct or virtual base class of the 1090 // class, a mem-initializer-id naming the member or base class and 1091 // composed of a single identifier refers to the class member. A 1092 // mem-initializer-id for the hidden base class may be specified 1093 // using a qualified name. ] 1094 if (!SS.getScopeRep() && !TemplateTypeTy) { 1095 // Look for a member, first. 1096 FieldDecl *Member = 0; 1097 DeclContext::lookup_result Result 1098 = ClassDecl->lookup(MemberOrBase); 1099 if (Result.first != Result.second) 1100 Member = dyn_cast<FieldDecl>(*Result.first); 1101 1102 // FIXME: Handle members of an anonymous union. 1103 1104 if (Member) 1105 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1106 LParenLoc, RParenLoc); 1107 } 1108 // It didn't name a member, so see if it names a class. 1109 QualType BaseType; 1110 TypeSourceInfo *TInfo = 0; 1111 1112 if (TemplateTypeTy) { 1113 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1114 } else { 1115 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1116 LookupParsedName(R, S, &SS); 1117 1118 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1119 if (!TyD) { 1120 if (R.isAmbiguous()) return true; 1121 1122 // We don't want access-control diagnostics here. 1123 R.suppressDiagnostics(); 1124 1125 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1126 bool NotUnknownSpecialization = false; 1127 DeclContext *DC = computeDeclContext(SS, false); 1128 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1129 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1130 1131 if (!NotUnknownSpecialization) { 1132 // When the scope specifier can refer to a member of an unknown 1133 // specialization, we take it as a type name. 1134 BaseType = CheckTypenameType(ETK_None, 1135 (NestedNameSpecifier *)SS.getScopeRep(), 1136 *MemberOrBase, SourceLocation(), 1137 SS.getRange(), IdLoc); 1138 if (BaseType.isNull()) 1139 return true; 1140 1141 R.clear(); 1142 R.setLookupName(MemberOrBase); 1143 } 1144 } 1145 1146 // If no results were found, try to correct typos. 1147 if (R.empty() && BaseType.isNull() && 1148 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1149 R.isSingleResult()) { 1150 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1151 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1152 // We have found a non-static data member with a similar 1153 // name to what was typed; complain and initialize that 1154 // member. 1155 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1156 << MemberOrBase << true << R.getLookupName() 1157 << FixItHint::CreateReplacement(R.getNameLoc(), 1158 R.getLookupName().getAsString()); 1159 Diag(Member->getLocation(), diag::note_previous_decl) 1160 << Member->getDeclName(); 1161 1162 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1163 LParenLoc, RParenLoc); 1164 } 1165 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1166 const CXXBaseSpecifier *DirectBaseSpec; 1167 const CXXBaseSpecifier *VirtualBaseSpec; 1168 if (FindBaseInitializer(*this, ClassDecl, 1169 Context.getTypeDeclType(Type), 1170 DirectBaseSpec, VirtualBaseSpec)) { 1171 // We have found a direct or virtual base class with a 1172 // similar name to what was typed; complain and initialize 1173 // that base class. 1174 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1175 << MemberOrBase << false << R.getLookupName() 1176 << FixItHint::CreateReplacement(R.getNameLoc(), 1177 R.getLookupName().getAsString()); 1178 1179 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1180 : VirtualBaseSpec; 1181 Diag(BaseSpec->getSourceRange().getBegin(), 1182 diag::note_base_class_specified_here) 1183 << BaseSpec->getType() 1184 << BaseSpec->getSourceRange(); 1185 1186 TyD = Type; 1187 } 1188 } 1189 } 1190 1191 if (!TyD && BaseType.isNull()) { 1192 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1193 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1194 return true; 1195 } 1196 } 1197 1198 if (BaseType.isNull()) { 1199 BaseType = Context.getTypeDeclType(TyD); 1200 if (SS.isSet()) { 1201 NestedNameSpecifier *Qualifier = 1202 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1203 1204 // FIXME: preserve source range information 1205 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1206 } 1207 } 1208 } 1209 1210 if (!TInfo) 1211 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1212 1213 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1214 LParenLoc, RParenLoc, ClassDecl); 1215} 1216 1217/// Checks an initializer expression for use of uninitialized fields, such as 1218/// containing the field that is being initialized. Returns true if there is an 1219/// uninitialized field was used an updates the SourceLocation parameter; false 1220/// otherwise. 1221static bool InitExprContainsUninitializedFields(const Stmt *S, 1222 const FieldDecl *LhsField, 1223 SourceLocation *L) { 1224 if (isa<CallExpr>(S)) { 1225 // Do not descend into function calls or constructors, as the use 1226 // of an uninitialized field may be valid. One would have to inspect 1227 // the contents of the function/ctor to determine if it is safe or not. 1228 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1229 // may be safe, depending on what the function/ctor does. 1230 return false; 1231 } 1232 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1233 const NamedDecl *RhsField = ME->getMemberDecl(); 1234 if (RhsField == LhsField) { 1235 // Initializing a field with itself. Throw a warning. 1236 // But wait; there are exceptions! 1237 // Exception #1: The field may not belong to this record. 1238 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1239 const Expr *base = ME->getBase(); 1240 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1241 // Even though the field matches, it does not belong to this record. 1242 return false; 1243 } 1244 // None of the exceptions triggered; return true to indicate an 1245 // uninitialized field was used. 1246 *L = ME->getMemberLoc(); 1247 return true; 1248 } 1249 } 1250 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1251 it != e; ++it) { 1252 if (!*it) { 1253 // An expression such as 'member(arg ?: "")' may trigger this. 1254 continue; 1255 } 1256 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1257 return true; 1258 } 1259 return false; 1260} 1261 1262Sema::MemInitResult 1263Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1264 unsigned NumArgs, SourceLocation IdLoc, 1265 SourceLocation LParenLoc, 1266 SourceLocation RParenLoc) { 1267 // Diagnose value-uses of fields to initialize themselves, e.g. 1268 // foo(foo) 1269 // where foo is not also a parameter to the constructor. 1270 // TODO: implement -Wuninitialized and fold this into that framework. 1271 for (unsigned i = 0; i < NumArgs; ++i) { 1272 SourceLocation L; 1273 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1274 // FIXME: Return true in the case when other fields are used before being 1275 // uninitialized. For example, let this field be the i'th field. When 1276 // initializing the i'th field, throw a warning if any of the >= i'th 1277 // fields are used, as they are not yet initialized. 1278 // Right now we are only handling the case where the i'th field uses 1279 // itself in its initializer. 1280 Diag(L, diag::warn_field_is_uninit); 1281 } 1282 } 1283 1284 bool HasDependentArg = false; 1285 for (unsigned i = 0; i < NumArgs; i++) 1286 HasDependentArg |= Args[i]->isTypeDependent(); 1287 1288 if (Member->getType()->isDependentType() || HasDependentArg) { 1289 // Can't check initialization for a member of dependent type or when 1290 // any of the arguments are type-dependent expressions. 1291 OwningExprResult Init 1292 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1293 RParenLoc)); 1294 1295 // Erase any temporaries within this evaluation context; we're not 1296 // going to track them in the AST, since we'll be rebuilding the 1297 // ASTs during template instantiation. 1298 ExprTemporaries.erase( 1299 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1300 ExprTemporaries.end()); 1301 1302 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1303 LParenLoc, 1304 Init.takeAs<Expr>(), 1305 RParenLoc); 1306 1307 } 1308 1309 if (Member->isInvalidDecl()) 1310 return true; 1311 1312 // Initialize the member. 1313 InitializedEntity MemberEntity = 1314 InitializedEntity::InitializeMember(Member, 0); 1315 InitializationKind Kind = 1316 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1317 1318 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1319 1320 OwningExprResult MemberInit = 1321 InitSeq.Perform(*this, MemberEntity, Kind, 1322 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1323 if (MemberInit.isInvalid()) 1324 return true; 1325 1326 // C++0x [class.base.init]p7: 1327 // The initialization of each base and member constitutes a 1328 // full-expression. 1329 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1330 if (MemberInit.isInvalid()) 1331 return true; 1332 1333 // If we are in a dependent context, template instantiation will 1334 // perform this type-checking again. Just save the arguments that we 1335 // received in a ParenListExpr. 1336 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1337 // of the information that we have about the member 1338 // initializer. However, deconstructing the ASTs is a dicey process, 1339 // and this approach is far more likely to get the corner cases right. 1340 if (CurContext->isDependentContext()) { 1341 // Bump the reference count of all of the arguments. 1342 for (unsigned I = 0; I != NumArgs; ++I) 1343 Args[I]->Retain(); 1344 1345 OwningExprResult Init 1346 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1347 RParenLoc)); 1348 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1349 LParenLoc, 1350 Init.takeAs<Expr>(), 1351 RParenLoc); 1352 } 1353 1354 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1355 LParenLoc, 1356 MemberInit.takeAs<Expr>(), 1357 RParenLoc); 1358} 1359 1360Sema::MemInitResult 1361Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1362 Expr **Args, unsigned NumArgs, 1363 SourceLocation LParenLoc, SourceLocation RParenLoc, 1364 CXXRecordDecl *ClassDecl) { 1365 bool HasDependentArg = false; 1366 for (unsigned i = 0; i < NumArgs; i++) 1367 HasDependentArg |= Args[i]->isTypeDependent(); 1368 1369 SourceLocation BaseLoc 1370 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1371 1372 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1373 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1374 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1375 1376 // C++ [class.base.init]p2: 1377 // [...] Unless the mem-initializer-id names a nonstatic data 1378 // member of the constructor’s class or a direct or virtual base 1379 // of that class, the mem-initializer is ill-formed. A 1380 // mem-initializer-list can initialize a base class using any 1381 // name that denotes that base class type. 1382 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1383 1384 // Check for direct and virtual base classes. 1385 const CXXBaseSpecifier *DirectBaseSpec = 0; 1386 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1387 if (!Dependent) { 1388 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1389 VirtualBaseSpec); 1390 1391 // C++ [base.class.init]p2: 1392 // Unless the mem-initializer-id names a nonstatic data member of the 1393 // constructor's class or a direct or virtual base of that class, the 1394 // mem-initializer is ill-formed. 1395 if (!DirectBaseSpec && !VirtualBaseSpec) { 1396 // If the class has any dependent bases, then it's possible that 1397 // one of those types will resolve to the same type as 1398 // BaseType. Therefore, just treat this as a dependent base 1399 // class initialization. FIXME: Should we try to check the 1400 // initialization anyway? It seems odd. 1401 if (ClassDecl->hasAnyDependentBases()) 1402 Dependent = true; 1403 else 1404 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1405 << BaseType << Context.getTypeDeclType(ClassDecl) 1406 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1407 } 1408 } 1409 1410 if (Dependent) { 1411 // Can't check initialization for a base of dependent type or when 1412 // any of the arguments are type-dependent expressions. 1413 OwningExprResult BaseInit 1414 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1415 RParenLoc)); 1416 1417 // Erase any temporaries within this evaluation context; we're not 1418 // going to track them in the AST, since we'll be rebuilding the 1419 // ASTs during template instantiation. 1420 ExprTemporaries.erase( 1421 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1422 ExprTemporaries.end()); 1423 1424 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1425 /*IsVirtual=*/false, 1426 LParenLoc, 1427 BaseInit.takeAs<Expr>(), 1428 RParenLoc); 1429 } 1430 1431 // C++ [base.class.init]p2: 1432 // If a mem-initializer-id is ambiguous because it designates both 1433 // a direct non-virtual base class and an inherited virtual base 1434 // class, the mem-initializer is ill-formed. 1435 if (DirectBaseSpec && VirtualBaseSpec) 1436 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1437 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1438 1439 CXXBaseSpecifier *BaseSpec 1440 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1441 if (!BaseSpec) 1442 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1443 1444 // Initialize the base. 1445 InitializedEntity BaseEntity = 1446 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1447 InitializationKind Kind = 1448 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1449 1450 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1451 1452 OwningExprResult BaseInit = 1453 InitSeq.Perform(*this, BaseEntity, Kind, 1454 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1455 if (BaseInit.isInvalid()) 1456 return true; 1457 1458 // C++0x [class.base.init]p7: 1459 // The initialization of each base and member constitutes a 1460 // full-expression. 1461 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1462 if (BaseInit.isInvalid()) 1463 return true; 1464 1465 // If we are in a dependent context, template instantiation will 1466 // perform this type-checking again. Just save the arguments that we 1467 // received in a ParenListExpr. 1468 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1469 // of the information that we have about the base 1470 // initializer. However, deconstructing the ASTs is a dicey process, 1471 // and this approach is far more likely to get the corner cases right. 1472 if (CurContext->isDependentContext()) { 1473 // Bump the reference count of all of the arguments. 1474 for (unsigned I = 0; I != NumArgs; ++I) 1475 Args[I]->Retain(); 1476 1477 OwningExprResult Init 1478 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1479 RParenLoc)); 1480 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1481 BaseSpec->isVirtual(), 1482 LParenLoc, 1483 Init.takeAs<Expr>(), 1484 RParenLoc); 1485 } 1486 1487 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1488 BaseSpec->isVirtual(), 1489 LParenLoc, 1490 BaseInit.takeAs<Expr>(), 1491 RParenLoc); 1492} 1493 1494/// ImplicitInitializerKind - How an implicit base or member initializer should 1495/// initialize its base or member. 1496enum ImplicitInitializerKind { 1497 IIK_Default, 1498 IIK_Copy, 1499 IIK_Move 1500}; 1501 1502static bool 1503BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1504 ImplicitInitializerKind ImplicitInitKind, 1505 CXXBaseSpecifier *BaseSpec, 1506 bool IsInheritedVirtualBase, 1507 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1508 InitializedEntity InitEntity 1509 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1510 IsInheritedVirtualBase); 1511 1512 Sema::OwningExprResult BaseInit(SemaRef); 1513 1514 switch (ImplicitInitKind) { 1515 case IIK_Default: { 1516 InitializationKind InitKind 1517 = InitializationKind::CreateDefault(Constructor->getLocation()); 1518 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1519 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1520 Sema::MultiExprArg(SemaRef, 0, 0)); 1521 break; 1522 } 1523 1524 case IIK_Copy: { 1525 ParmVarDecl *Param = Constructor->getParamDecl(0); 1526 QualType ParamType = Param->getType().getNonReferenceType(); 1527 1528 Expr *CopyCtorArg = 1529 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1530 Constructor->getLocation(), ParamType, 0); 1531 1532 // Cast to the base class to avoid ambiguities. 1533 QualType ArgTy = 1534 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1535 ParamType.getQualifiers()); 1536 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1537 CastExpr::CK_UncheckedDerivedToBase, 1538 ImplicitCastExpr::LValue, 1539 CXXBaseSpecifierArray(BaseSpec)); 1540 1541 InitializationKind InitKind 1542 = InitializationKind::CreateDirect(Constructor->getLocation(), 1543 SourceLocation(), SourceLocation()); 1544 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1545 &CopyCtorArg, 1); 1546 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1547 Sema::MultiExprArg(SemaRef, 1548 (void**)&CopyCtorArg, 1)); 1549 break; 1550 } 1551 1552 case IIK_Move: 1553 assert(false && "Unhandled initializer kind!"); 1554 } 1555 1556 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1557 if (BaseInit.isInvalid()) 1558 return true; 1559 1560 CXXBaseInit = 1561 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1562 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1563 SourceLocation()), 1564 BaseSpec->isVirtual(), 1565 SourceLocation(), 1566 BaseInit.takeAs<Expr>(), 1567 SourceLocation()); 1568 1569 return false; 1570} 1571 1572static bool 1573BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1574 ImplicitInitializerKind ImplicitInitKind, 1575 FieldDecl *Field, 1576 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1577 if (Field->isInvalidDecl()) 1578 return true; 1579 1580 SourceLocation Loc = Constructor->getLocation(); 1581 1582 if (ImplicitInitKind == IIK_Copy) { 1583 ParmVarDecl *Param = Constructor->getParamDecl(0); 1584 QualType ParamType = Param->getType().getNonReferenceType(); 1585 1586 Expr *MemberExprBase = 1587 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1588 Loc, ParamType, 0); 1589 1590 // Build a reference to this field within the parameter. 1591 CXXScopeSpec SS; 1592 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1593 Sema::LookupMemberName); 1594 MemberLookup.addDecl(Field, AS_public); 1595 MemberLookup.resolveKind(); 1596 Sema::OwningExprResult CopyCtorArg 1597 = SemaRef.BuildMemberReferenceExpr(SemaRef.Owned(MemberExprBase), 1598 ParamType, Loc, 1599 /*IsArrow=*/false, 1600 SS, 1601 /*FirstQualifierInScope=*/0, 1602 MemberLookup, 1603 /*TemplateArgs=*/0); 1604 if (CopyCtorArg.isInvalid()) 1605 return true; 1606 1607 // When the field we are copying is an array, create index variables for 1608 // each dimension of the array. We use these index variables to subscript 1609 // the source array, and other clients (e.g., CodeGen) will perform the 1610 // necessary iteration with these index variables. 1611 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1612 QualType BaseType = Field->getType(); 1613 QualType SizeType = SemaRef.Context.getSizeType(); 1614 while (const ConstantArrayType *Array 1615 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1616 // Create the iteration variable for this array index. 1617 IdentifierInfo *IterationVarName = 0; 1618 { 1619 llvm::SmallString<8> Str; 1620 llvm::raw_svector_ostream OS(Str); 1621 OS << "__i" << IndexVariables.size(); 1622 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1623 } 1624 VarDecl *IterationVar 1625 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1626 IterationVarName, SizeType, 1627 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1628 VarDecl::None, VarDecl::None); 1629 IndexVariables.push_back(IterationVar); 1630 1631 // Create a reference to the iteration variable. 1632 Sema::OwningExprResult IterationVarRef 1633 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1634 assert(!IterationVarRef.isInvalid() && 1635 "Reference to invented variable cannot fail!"); 1636 1637 // Subscript the array with this iteration variable. 1638 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(move(CopyCtorArg), 1639 Loc, 1640 move(IterationVarRef), 1641 Loc); 1642 if (CopyCtorArg.isInvalid()) 1643 return true; 1644 1645 BaseType = Array->getElementType(); 1646 } 1647 1648 // Construct the entity that we will be initializing. For an array, this 1649 // will be first element in the array, which may require several levels 1650 // of array-subscript entities. 1651 llvm::SmallVector<InitializedEntity, 4> Entities; 1652 Entities.reserve(1 + IndexVariables.size()); 1653 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1654 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1655 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1656 0, 1657 Entities.back())); 1658 1659 // Direct-initialize to use the copy constructor. 1660 InitializationKind InitKind = 1661 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1662 1663 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1664 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1665 &CopyCtorArgE, 1); 1666 1667 Sema::OwningExprResult MemberInit 1668 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1669 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArgE, 1)); 1670 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1671 if (MemberInit.isInvalid()) 1672 return true; 1673 1674 CXXMemberInit 1675 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1676 MemberInit.takeAs<Expr>(), Loc, 1677 IndexVariables.data(), 1678 IndexVariables.size()); 1679 return false; 1680 } 1681 1682 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1683 1684 QualType FieldBaseElementType = 1685 SemaRef.Context.getBaseElementType(Field->getType()); 1686 1687 if (FieldBaseElementType->isRecordType()) { 1688 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1689 InitializationKind InitKind = 1690 InitializationKind::CreateDefault(Loc); 1691 1692 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1693 Sema::OwningExprResult MemberInit = 1694 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1695 Sema::MultiExprArg(SemaRef, 0, 0)); 1696 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1697 if (MemberInit.isInvalid()) 1698 return true; 1699 1700 CXXMemberInit = 1701 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1702 Field, Loc, Loc, 1703 MemberInit.takeAs<Expr>(), 1704 Loc); 1705 return false; 1706 } 1707 1708 if (FieldBaseElementType->isReferenceType()) { 1709 SemaRef.Diag(Constructor->getLocation(), 1710 diag::err_uninitialized_member_in_ctor) 1711 << (int)Constructor->isImplicit() 1712 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1713 << 0 << Field->getDeclName(); 1714 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1715 return true; 1716 } 1717 1718 if (FieldBaseElementType.isConstQualified()) { 1719 SemaRef.Diag(Constructor->getLocation(), 1720 diag::err_uninitialized_member_in_ctor) 1721 << (int)Constructor->isImplicit() 1722 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1723 << 1 << Field->getDeclName(); 1724 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1725 return true; 1726 } 1727 1728 // Nothing to initialize. 1729 CXXMemberInit = 0; 1730 return false; 1731} 1732 1733namespace { 1734struct BaseAndFieldInfo { 1735 Sema &S; 1736 CXXConstructorDecl *Ctor; 1737 bool AnyErrorsInInits; 1738 ImplicitInitializerKind IIK; 1739 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1740 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1741 1742 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1743 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1744 // FIXME: Handle implicit move constructors. 1745 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1746 IIK = IIK_Copy; 1747 else 1748 IIK = IIK_Default; 1749 } 1750}; 1751} 1752 1753static void RecordFieldInitializer(BaseAndFieldInfo &Info, 1754 FieldDecl *Top, FieldDecl *Field, 1755 CXXBaseOrMemberInitializer *Init) { 1756 // If the member doesn't need to be initialized, Init will still be null. 1757 if (!Init) 1758 return; 1759 1760 Info.AllToInit.push_back(Init); 1761 if (Field != Top) { 1762 Init->setMember(Top); 1763 Init->setAnonUnionMember(Field); 1764 } 1765} 1766 1767static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1768 FieldDecl *Top, FieldDecl *Field) { 1769 1770 // Overwhelmingly common case: we have a direct initializer for this field. 1771 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1772 RecordFieldInitializer(Info, Top, Field, Init); 1773 return false; 1774 } 1775 1776 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1777 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1778 assert(FieldClassType && "anonymous struct/union without record type"); 1779 CXXRecordDecl *FieldClassDecl 1780 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1781 1782 // Even though union members never have non-trivial default 1783 // constructions in C++03, we still build member initializers for aggregate 1784 // record types which can be union members, and C++0x allows non-trivial 1785 // default constructors for union members, so we ensure that only one 1786 // member is initialized for these. 1787 if (FieldClassDecl->isUnion()) { 1788 // First check for an explicit initializer for one field. 1789 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1790 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1791 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1792 RecordFieldInitializer(Info, Top, *FA, Init); 1793 1794 // Once we've initialized a field of an anonymous union, the union 1795 // field in the class is also initialized, so exit immediately. 1796 return false; 1797 } 1798 } 1799 1800 // Fallthrough and construct a default initializer for the union as 1801 // a whole, which can call its default constructor if such a thing exists 1802 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1803 // behavior going forward with C++0x, when anonymous unions there are 1804 // finalized, we should revisit this. 1805 } else { 1806 // For structs, we simply descend through to initialize all members where 1807 // necessary. 1808 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1809 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1810 if (CollectFieldInitializer(Info, Top, *FA)) 1811 return true; 1812 } 1813 } 1814 } 1815 1816 // Don't try to build an implicit initializer if there were semantic 1817 // errors in any of the initializers (and therefore we might be 1818 // missing some that the user actually wrote). 1819 if (Info.AnyErrorsInInits) 1820 return false; 1821 1822 CXXBaseOrMemberInitializer *Init = 0; 1823 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1824 return true; 1825 1826 RecordFieldInitializer(Info, Top, Field, Init); 1827 return false; 1828} 1829 1830bool 1831Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1832 CXXBaseOrMemberInitializer **Initializers, 1833 unsigned NumInitializers, 1834 bool AnyErrors) { 1835 if (Constructor->getDeclContext()->isDependentContext()) { 1836 // Just store the initializers as written, they will be checked during 1837 // instantiation. 1838 if (NumInitializers > 0) { 1839 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1840 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1841 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1842 memcpy(baseOrMemberInitializers, Initializers, 1843 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1844 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1845 } 1846 1847 return false; 1848 } 1849 1850 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1851 1852 // We need to build the initializer AST according to order of construction 1853 // and not what user specified in the Initializers list. 1854 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1855 if (!ClassDecl) 1856 return true; 1857 1858 bool HadError = false; 1859 1860 for (unsigned i = 0; i < NumInitializers; i++) { 1861 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1862 1863 if (Member->isBaseInitializer()) 1864 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1865 else 1866 Info.AllBaseFields[Member->getMember()] = Member; 1867 } 1868 1869 // Keep track of the direct virtual bases. 1870 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1871 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1872 E = ClassDecl->bases_end(); I != E; ++I) { 1873 if (I->isVirtual()) 1874 DirectVBases.insert(I); 1875 } 1876 1877 // Push virtual bases before others. 1878 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1879 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1880 1881 if (CXXBaseOrMemberInitializer *Value 1882 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1883 Info.AllToInit.push_back(Value); 1884 } else if (!AnyErrors) { 1885 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1886 CXXBaseOrMemberInitializer *CXXBaseInit; 1887 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1888 VBase, IsInheritedVirtualBase, 1889 CXXBaseInit)) { 1890 HadError = true; 1891 continue; 1892 } 1893 1894 Info.AllToInit.push_back(CXXBaseInit); 1895 } 1896 } 1897 1898 // Non-virtual bases. 1899 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1900 E = ClassDecl->bases_end(); Base != E; ++Base) { 1901 // Virtuals are in the virtual base list and already constructed. 1902 if (Base->isVirtual()) 1903 continue; 1904 1905 if (CXXBaseOrMemberInitializer *Value 1906 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1907 Info.AllToInit.push_back(Value); 1908 } else if (!AnyErrors) { 1909 CXXBaseOrMemberInitializer *CXXBaseInit; 1910 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1911 Base, /*IsInheritedVirtualBase=*/false, 1912 CXXBaseInit)) { 1913 HadError = true; 1914 continue; 1915 } 1916 1917 Info.AllToInit.push_back(CXXBaseInit); 1918 } 1919 } 1920 1921 // Fields. 1922 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1923 E = ClassDecl->field_end(); Field != E; ++Field) { 1924 if ((*Field)->getType()->isIncompleteArrayType()) { 1925 assert(ClassDecl->hasFlexibleArrayMember() && 1926 "Incomplete array type is not valid"); 1927 continue; 1928 } 1929 if (CollectFieldInitializer(Info, *Field, *Field)) 1930 HadError = true; 1931 } 1932 1933 NumInitializers = Info.AllToInit.size(); 1934 if (NumInitializers > 0) { 1935 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1936 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1937 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1938 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1939 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1940 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1941 1942 // Constructors implicitly reference the base and member 1943 // destructors. 1944 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1945 Constructor->getParent()); 1946 } 1947 1948 return HadError; 1949} 1950 1951static void *GetKeyForTopLevelField(FieldDecl *Field) { 1952 // For anonymous unions, use the class declaration as the key. 1953 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1954 if (RT->getDecl()->isAnonymousStructOrUnion()) 1955 return static_cast<void *>(RT->getDecl()); 1956 } 1957 return static_cast<void *>(Field); 1958} 1959 1960static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1961 return Context.getCanonicalType(BaseType).getTypePtr(); 1962} 1963 1964static void *GetKeyForMember(ASTContext &Context, 1965 CXXBaseOrMemberInitializer *Member, 1966 bool MemberMaybeAnon = false) { 1967 if (!Member->isMemberInitializer()) 1968 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1969 1970 // For fields injected into the class via declaration of an anonymous union, 1971 // use its anonymous union class declaration as the unique key. 1972 FieldDecl *Field = Member->getMember(); 1973 1974 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1975 // data member of the class. Data member used in the initializer list is 1976 // in AnonUnionMember field. 1977 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1978 Field = Member->getAnonUnionMember(); 1979 1980 // If the field is a member of an anonymous struct or union, our key 1981 // is the anonymous record decl that's a direct child of the class. 1982 RecordDecl *RD = Field->getParent(); 1983 if (RD->isAnonymousStructOrUnion()) { 1984 while (true) { 1985 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1986 if (Parent->isAnonymousStructOrUnion()) 1987 RD = Parent; 1988 else 1989 break; 1990 } 1991 1992 return static_cast<void *>(RD); 1993 } 1994 1995 return static_cast<void *>(Field); 1996} 1997 1998static void 1999DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2000 const CXXConstructorDecl *Constructor, 2001 CXXBaseOrMemberInitializer **Inits, 2002 unsigned NumInits) { 2003 if (Constructor->getDeclContext()->isDependentContext()) 2004 return; 2005 2006 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 2007 == Diagnostic::Ignored) 2008 return; 2009 2010 // Build the list of bases and members in the order that they'll 2011 // actually be initialized. The explicit initializers should be in 2012 // this same order but may be missing things. 2013 llvm::SmallVector<const void*, 32> IdealInitKeys; 2014 2015 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2016 2017 // 1. Virtual bases. 2018 for (CXXRecordDecl::base_class_const_iterator VBase = 2019 ClassDecl->vbases_begin(), 2020 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2021 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2022 2023 // 2. Non-virtual bases. 2024 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2025 E = ClassDecl->bases_end(); Base != E; ++Base) { 2026 if (Base->isVirtual()) 2027 continue; 2028 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2029 } 2030 2031 // 3. Direct fields. 2032 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2033 E = ClassDecl->field_end(); Field != E; ++Field) 2034 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2035 2036 unsigned NumIdealInits = IdealInitKeys.size(); 2037 unsigned IdealIndex = 0; 2038 2039 CXXBaseOrMemberInitializer *PrevInit = 0; 2040 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2041 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2042 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2043 2044 // Scan forward to try to find this initializer in the idealized 2045 // initializers list. 2046 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2047 if (InitKey == IdealInitKeys[IdealIndex]) 2048 break; 2049 2050 // If we didn't find this initializer, it must be because we 2051 // scanned past it on a previous iteration. That can only 2052 // happen if we're out of order; emit a warning. 2053 if (IdealIndex == NumIdealInits && PrevInit) { 2054 Sema::SemaDiagnosticBuilder D = 2055 SemaRef.Diag(PrevInit->getSourceLocation(), 2056 diag::warn_initializer_out_of_order); 2057 2058 if (PrevInit->isMemberInitializer()) 2059 D << 0 << PrevInit->getMember()->getDeclName(); 2060 else 2061 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2062 2063 if (Init->isMemberInitializer()) 2064 D << 0 << Init->getMember()->getDeclName(); 2065 else 2066 D << 1 << Init->getBaseClassInfo()->getType(); 2067 2068 // Move back to the initializer's location in the ideal list. 2069 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2070 if (InitKey == IdealInitKeys[IdealIndex]) 2071 break; 2072 2073 assert(IdealIndex != NumIdealInits && 2074 "initializer not found in initializer list"); 2075 } 2076 2077 PrevInit = Init; 2078 } 2079} 2080 2081namespace { 2082bool CheckRedundantInit(Sema &S, 2083 CXXBaseOrMemberInitializer *Init, 2084 CXXBaseOrMemberInitializer *&PrevInit) { 2085 if (!PrevInit) { 2086 PrevInit = Init; 2087 return false; 2088 } 2089 2090 if (FieldDecl *Field = Init->getMember()) 2091 S.Diag(Init->getSourceLocation(), 2092 diag::err_multiple_mem_initialization) 2093 << Field->getDeclName() 2094 << Init->getSourceRange(); 2095 else { 2096 Type *BaseClass = Init->getBaseClass(); 2097 assert(BaseClass && "neither field nor base"); 2098 S.Diag(Init->getSourceLocation(), 2099 diag::err_multiple_base_initialization) 2100 << QualType(BaseClass, 0) 2101 << Init->getSourceRange(); 2102 } 2103 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2104 << 0 << PrevInit->getSourceRange(); 2105 2106 return true; 2107} 2108 2109typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2110typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2111 2112bool CheckRedundantUnionInit(Sema &S, 2113 CXXBaseOrMemberInitializer *Init, 2114 RedundantUnionMap &Unions) { 2115 FieldDecl *Field = Init->getMember(); 2116 RecordDecl *Parent = Field->getParent(); 2117 if (!Parent->isAnonymousStructOrUnion()) 2118 return false; 2119 2120 NamedDecl *Child = Field; 2121 do { 2122 if (Parent->isUnion()) { 2123 UnionEntry &En = Unions[Parent]; 2124 if (En.first && En.first != Child) { 2125 S.Diag(Init->getSourceLocation(), 2126 diag::err_multiple_mem_union_initialization) 2127 << Field->getDeclName() 2128 << Init->getSourceRange(); 2129 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2130 << 0 << En.second->getSourceRange(); 2131 return true; 2132 } else if (!En.first) { 2133 En.first = Child; 2134 En.second = Init; 2135 } 2136 } 2137 2138 Child = Parent; 2139 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2140 } while (Parent->isAnonymousStructOrUnion()); 2141 2142 return false; 2143} 2144} 2145 2146/// ActOnMemInitializers - Handle the member initializers for a constructor. 2147void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 2148 SourceLocation ColonLoc, 2149 MemInitTy **meminits, unsigned NumMemInits, 2150 bool AnyErrors) { 2151 if (!ConstructorDecl) 2152 return; 2153 2154 AdjustDeclIfTemplate(ConstructorDecl); 2155 2156 CXXConstructorDecl *Constructor 2157 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 2158 2159 if (!Constructor) { 2160 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2161 return; 2162 } 2163 2164 CXXBaseOrMemberInitializer **MemInits = 2165 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2166 2167 // Mapping for the duplicate initializers check. 2168 // For member initializers, this is keyed with a FieldDecl*. 2169 // For base initializers, this is keyed with a Type*. 2170 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2171 2172 // Mapping for the inconsistent anonymous-union initializers check. 2173 RedundantUnionMap MemberUnions; 2174 2175 bool HadError = false; 2176 for (unsigned i = 0; i < NumMemInits; i++) { 2177 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2178 2179 // Set the source order index. 2180 Init->setSourceOrder(i); 2181 2182 if (Init->isMemberInitializer()) { 2183 FieldDecl *Field = Init->getMember(); 2184 if (CheckRedundantInit(*this, Init, Members[Field]) || 2185 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2186 HadError = true; 2187 } else { 2188 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2189 if (CheckRedundantInit(*this, Init, Members[Key])) 2190 HadError = true; 2191 } 2192 } 2193 2194 if (HadError) 2195 return; 2196 2197 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2198 2199 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2200} 2201 2202void 2203Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2204 CXXRecordDecl *ClassDecl) { 2205 // Ignore dependent contexts. 2206 if (ClassDecl->isDependentContext()) 2207 return; 2208 2209 // FIXME: all the access-control diagnostics are positioned on the 2210 // field/base declaration. That's probably good; that said, the 2211 // user might reasonably want to know why the destructor is being 2212 // emitted, and we currently don't say. 2213 2214 // Non-static data members. 2215 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2216 E = ClassDecl->field_end(); I != E; ++I) { 2217 FieldDecl *Field = *I; 2218 if (Field->isInvalidDecl()) 2219 continue; 2220 QualType FieldType = Context.getBaseElementType(Field->getType()); 2221 2222 const RecordType* RT = FieldType->getAs<RecordType>(); 2223 if (!RT) 2224 continue; 2225 2226 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2227 if (FieldClassDecl->hasTrivialDestructor()) 2228 continue; 2229 2230 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2231 CheckDestructorAccess(Field->getLocation(), Dtor, 2232 PDiag(diag::err_access_dtor_field) 2233 << Field->getDeclName() 2234 << FieldType); 2235 2236 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2237 } 2238 2239 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2240 2241 // Bases. 2242 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2243 E = ClassDecl->bases_end(); Base != E; ++Base) { 2244 // Bases are always records in a well-formed non-dependent class. 2245 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2246 2247 // Remember direct virtual bases. 2248 if (Base->isVirtual()) 2249 DirectVirtualBases.insert(RT); 2250 2251 // Ignore trivial destructors. 2252 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2253 if (BaseClassDecl->hasTrivialDestructor()) 2254 continue; 2255 2256 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2257 2258 // FIXME: caret should be on the start of the class name 2259 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2260 PDiag(diag::err_access_dtor_base) 2261 << Base->getType() 2262 << Base->getSourceRange()); 2263 2264 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2265 } 2266 2267 // Virtual bases. 2268 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2269 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2270 2271 // Bases are always records in a well-formed non-dependent class. 2272 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2273 2274 // Ignore direct virtual bases. 2275 if (DirectVirtualBases.count(RT)) 2276 continue; 2277 2278 // Ignore trivial destructors. 2279 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2280 if (BaseClassDecl->hasTrivialDestructor()) 2281 continue; 2282 2283 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2284 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2285 PDiag(diag::err_access_dtor_vbase) 2286 << VBase->getType()); 2287 2288 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2289 } 2290} 2291 2292void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2293 if (!CDtorDecl) 2294 return; 2295 2296 if (CXXConstructorDecl *Constructor 2297 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2298 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2299} 2300 2301bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2302 unsigned DiagID, AbstractDiagSelID SelID, 2303 const CXXRecordDecl *CurrentRD) { 2304 if (SelID == -1) 2305 return RequireNonAbstractType(Loc, T, 2306 PDiag(DiagID), CurrentRD); 2307 else 2308 return RequireNonAbstractType(Loc, T, 2309 PDiag(DiagID) << SelID, CurrentRD); 2310} 2311 2312bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2313 const PartialDiagnostic &PD, 2314 const CXXRecordDecl *CurrentRD) { 2315 if (!getLangOptions().CPlusPlus) 2316 return false; 2317 2318 if (const ArrayType *AT = Context.getAsArrayType(T)) 2319 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2320 CurrentRD); 2321 2322 if (const PointerType *PT = T->getAs<PointerType>()) { 2323 // Find the innermost pointer type. 2324 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2325 PT = T; 2326 2327 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2328 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2329 } 2330 2331 const RecordType *RT = T->getAs<RecordType>(); 2332 if (!RT) 2333 return false; 2334 2335 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2336 2337 if (CurrentRD && CurrentRD != RD) 2338 return false; 2339 2340 // FIXME: is this reasonable? It matches current behavior, but.... 2341 if (!RD->getDefinition()) 2342 return false; 2343 2344 if (!RD->isAbstract()) 2345 return false; 2346 2347 Diag(Loc, PD) << RD->getDeclName(); 2348 2349 // Check if we've already emitted the list of pure virtual functions for this 2350 // class. 2351 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2352 return true; 2353 2354 CXXFinalOverriderMap FinalOverriders; 2355 RD->getFinalOverriders(FinalOverriders); 2356 2357 // Keep a set of seen pure methods so we won't diagnose the same method 2358 // more than once. 2359 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2360 2361 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2362 MEnd = FinalOverriders.end(); 2363 M != MEnd; 2364 ++M) { 2365 for (OverridingMethods::iterator SO = M->second.begin(), 2366 SOEnd = M->second.end(); 2367 SO != SOEnd; ++SO) { 2368 // C++ [class.abstract]p4: 2369 // A class is abstract if it contains or inherits at least one 2370 // pure virtual function for which the final overrider is pure 2371 // virtual. 2372 2373 // 2374 if (SO->second.size() != 1) 2375 continue; 2376 2377 if (!SO->second.front().Method->isPure()) 2378 continue; 2379 2380 if (!SeenPureMethods.insert(SO->second.front().Method)) 2381 continue; 2382 2383 Diag(SO->second.front().Method->getLocation(), 2384 diag::note_pure_virtual_function) 2385 << SO->second.front().Method->getDeclName(); 2386 } 2387 } 2388 2389 if (!PureVirtualClassDiagSet) 2390 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2391 PureVirtualClassDiagSet->insert(RD); 2392 2393 return true; 2394} 2395 2396namespace { 2397 class AbstractClassUsageDiagnoser 2398 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2399 Sema &SemaRef; 2400 CXXRecordDecl *AbstractClass; 2401 2402 bool VisitDeclContext(const DeclContext *DC) { 2403 bool Invalid = false; 2404 2405 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2406 E = DC->decls_end(); I != E; ++I) 2407 Invalid |= Visit(*I); 2408 2409 return Invalid; 2410 } 2411 2412 public: 2413 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2414 : SemaRef(SemaRef), AbstractClass(ac) { 2415 Visit(SemaRef.Context.getTranslationUnitDecl()); 2416 } 2417 2418 bool VisitFunctionDecl(const FunctionDecl *FD) { 2419 if (FD->isThisDeclarationADefinition()) { 2420 // No need to do the check if we're in a definition, because it requires 2421 // that the return/param types are complete. 2422 // because that requires 2423 return VisitDeclContext(FD); 2424 } 2425 2426 // Check the return type. 2427 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2428 bool Invalid = 2429 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2430 diag::err_abstract_type_in_decl, 2431 Sema::AbstractReturnType, 2432 AbstractClass); 2433 2434 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2435 E = FD->param_end(); I != E; ++I) { 2436 const ParmVarDecl *VD = *I; 2437 Invalid |= 2438 SemaRef.RequireNonAbstractType(VD->getLocation(), 2439 VD->getOriginalType(), 2440 diag::err_abstract_type_in_decl, 2441 Sema::AbstractParamType, 2442 AbstractClass); 2443 } 2444 2445 return Invalid; 2446 } 2447 2448 bool VisitDecl(const Decl* D) { 2449 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2450 return VisitDeclContext(DC); 2451 2452 return false; 2453 } 2454 }; 2455} 2456 2457/// \brief Perform semantic checks on a class definition that has been 2458/// completing, introducing implicitly-declared members, checking for 2459/// abstract types, etc. 2460void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2461 if (!Record || Record->isInvalidDecl()) 2462 return; 2463 2464 if (!Record->isDependentType()) 2465 AddImplicitlyDeclaredMembersToClass(Record); 2466 2467 if (Record->isInvalidDecl()) 2468 return; 2469 2470 // Set access bits correctly on the directly-declared conversions. 2471 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2472 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2473 Convs->setAccess(I, (*I)->getAccess()); 2474 2475 // Determine whether we need to check for final overriders. We do 2476 // this either when there are virtual base classes (in which case we 2477 // may end up finding multiple final overriders for a given virtual 2478 // function) or any of the base classes is abstract (in which case 2479 // we might detect that this class is abstract). 2480 bool CheckFinalOverriders = false; 2481 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2482 !Record->isDependentType()) { 2483 if (Record->getNumVBases()) 2484 CheckFinalOverriders = true; 2485 else if (!Record->isAbstract()) { 2486 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2487 BEnd = Record->bases_end(); 2488 B != BEnd; ++B) { 2489 CXXRecordDecl *BaseDecl 2490 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2491 if (BaseDecl->isAbstract()) { 2492 CheckFinalOverriders = true; 2493 break; 2494 } 2495 } 2496 } 2497 } 2498 2499 if (CheckFinalOverriders) { 2500 CXXFinalOverriderMap FinalOverriders; 2501 Record->getFinalOverriders(FinalOverriders); 2502 2503 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2504 MEnd = FinalOverriders.end(); 2505 M != MEnd; ++M) { 2506 for (OverridingMethods::iterator SO = M->second.begin(), 2507 SOEnd = M->second.end(); 2508 SO != SOEnd; ++SO) { 2509 assert(SO->second.size() > 0 && 2510 "All virtual functions have overridding virtual functions"); 2511 if (SO->second.size() == 1) { 2512 // C++ [class.abstract]p4: 2513 // A class is abstract if it contains or inherits at least one 2514 // pure virtual function for which the final overrider is pure 2515 // virtual. 2516 if (SO->second.front().Method->isPure()) 2517 Record->setAbstract(true); 2518 continue; 2519 } 2520 2521 // C++ [class.virtual]p2: 2522 // In a derived class, if a virtual member function of a base 2523 // class subobject has more than one final overrider the 2524 // program is ill-formed. 2525 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2526 << (NamedDecl *)M->first << Record; 2527 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2528 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2529 OMEnd = SO->second.end(); 2530 OM != OMEnd; ++OM) 2531 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2532 << (NamedDecl *)M->first << OM->Method->getParent(); 2533 2534 Record->setInvalidDecl(); 2535 } 2536 } 2537 } 2538 2539 if (Record->isAbstract() && !Record->isInvalidDecl()) 2540 (void)AbstractClassUsageDiagnoser(*this, Record); 2541 2542 // If this is not an aggregate type and has no user-declared constructor, 2543 // complain about any non-static data members of reference or const scalar 2544 // type, since they will never get initializers. 2545 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2546 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2547 bool Complained = false; 2548 for (RecordDecl::field_iterator F = Record->field_begin(), 2549 FEnd = Record->field_end(); 2550 F != FEnd; ++F) { 2551 if (F->getType()->isReferenceType() || 2552 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2553 if (!Complained) { 2554 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2555 << Record->getTagKind() << Record; 2556 Complained = true; 2557 } 2558 2559 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2560 << F->getType()->isReferenceType() 2561 << F->getDeclName(); 2562 } 2563 } 2564 } 2565 2566 if (Record->isDynamicClass()) 2567 DynamicClasses.push_back(Record); 2568} 2569 2570void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2571 DeclPtrTy TagDecl, 2572 SourceLocation LBrac, 2573 SourceLocation RBrac, 2574 AttributeList *AttrList) { 2575 if (!TagDecl) 2576 return; 2577 2578 AdjustDeclIfTemplate(TagDecl); 2579 2580 ActOnFields(S, RLoc, TagDecl, 2581 (DeclPtrTy*)FieldCollector->getCurFields(), 2582 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2583 2584 CheckCompletedCXXClass( 2585 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2586} 2587 2588namespace { 2589 /// \brief Helper class that collects exception specifications for 2590 /// implicitly-declared special member functions. 2591 class ImplicitExceptionSpecification { 2592 ASTContext &Context; 2593 bool AllowsAllExceptions; 2594 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2595 llvm::SmallVector<QualType, 4> Exceptions; 2596 2597 public: 2598 explicit ImplicitExceptionSpecification(ASTContext &Context) 2599 : Context(Context), AllowsAllExceptions(false) { } 2600 2601 /// \brief Whether the special member function should have any 2602 /// exception specification at all. 2603 bool hasExceptionSpecification() const { 2604 return !AllowsAllExceptions; 2605 } 2606 2607 /// \brief Whether the special member function should have a 2608 /// throw(...) exception specification (a Microsoft extension). 2609 bool hasAnyExceptionSpecification() const { 2610 return false; 2611 } 2612 2613 /// \brief The number of exceptions in the exception specification. 2614 unsigned size() const { return Exceptions.size(); } 2615 2616 /// \brief The set of exceptions in the exception specification. 2617 const QualType *data() const { return Exceptions.data(); } 2618 2619 /// \brief Note that 2620 void CalledDecl(CXXMethodDecl *Method) { 2621 // If we already know that we allow all exceptions, do nothing. 2622 if (AllowsAllExceptions || !Method) 2623 return; 2624 2625 const FunctionProtoType *Proto 2626 = Method->getType()->getAs<FunctionProtoType>(); 2627 2628 // If this function can throw any exceptions, make a note of that. 2629 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2630 AllowsAllExceptions = true; 2631 ExceptionsSeen.clear(); 2632 Exceptions.clear(); 2633 return; 2634 } 2635 2636 // Record the exceptions in this function's exception specification. 2637 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2638 EEnd = Proto->exception_end(); 2639 E != EEnd; ++E) 2640 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2641 Exceptions.push_back(*E); 2642 } 2643 }; 2644} 2645 2646 2647/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2648/// special functions, such as the default constructor, copy 2649/// constructor, or destructor, to the given C++ class (C++ 2650/// [special]p1). This routine can only be executed just before the 2651/// definition of the class is complete. 2652void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2653 if (!ClassDecl->hasUserDeclaredConstructor()) 2654 ++ASTContext::NumImplicitDefaultConstructors; 2655 2656 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2657 ++ASTContext::NumImplicitCopyConstructors; 2658 2659 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2660 ++ASTContext::NumImplicitCopyAssignmentOperators; 2661 2662 // If we have a dynamic class, then the copy assignment operator may be 2663 // virtual, so we have to declare it immediately. This ensures that, e.g., 2664 // it shows up in the right place in the vtable and that we diagnose 2665 // problems with the implicit exception specification. 2666 if (ClassDecl->isDynamicClass()) 2667 DeclareImplicitCopyAssignment(ClassDecl); 2668 } 2669 2670 if (!ClassDecl->hasUserDeclaredDestructor()) { 2671 ++ASTContext::NumImplicitDestructors; 2672 2673 // If we have a dynamic class, then the destructor may be virtual, so we 2674 // have to declare the destructor immediately. This ensures that, e.g., it 2675 // shows up in the right place in the vtable and that we diagnose problems 2676 // with the implicit exception specification. 2677 if (ClassDecl->isDynamicClass()) 2678 DeclareImplicitDestructor(ClassDecl); 2679 } 2680} 2681 2682void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2683 Decl *D = TemplateD.getAs<Decl>(); 2684 if (!D) 2685 return; 2686 2687 TemplateParameterList *Params = 0; 2688 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2689 Params = Template->getTemplateParameters(); 2690 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2691 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2692 Params = PartialSpec->getTemplateParameters(); 2693 else 2694 return; 2695 2696 for (TemplateParameterList::iterator Param = Params->begin(), 2697 ParamEnd = Params->end(); 2698 Param != ParamEnd; ++Param) { 2699 NamedDecl *Named = cast<NamedDecl>(*Param); 2700 if (Named->getDeclName()) { 2701 S->AddDecl(DeclPtrTy::make(Named)); 2702 IdResolver.AddDecl(Named); 2703 } 2704 } 2705} 2706 2707void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2708 if (!RecordD) return; 2709 AdjustDeclIfTemplate(RecordD); 2710 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2711 PushDeclContext(S, Record); 2712} 2713 2714void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2715 if (!RecordD) return; 2716 PopDeclContext(); 2717} 2718 2719/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2720/// parsing a top-level (non-nested) C++ class, and we are now 2721/// parsing those parts of the given Method declaration that could 2722/// not be parsed earlier (C++ [class.mem]p2), such as default 2723/// arguments. This action should enter the scope of the given 2724/// Method declaration as if we had just parsed the qualified method 2725/// name. However, it should not bring the parameters into scope; 2726/// that will be performed by ActOnDelayedCXXMethodParameter. 2727void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2728} 2729 2730/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2731/// C++ method declaration. We're (re-)introducing the given 2732/// function parameter into scope for use in parsing later parts of 2733/// the method declaration. For example, we could see an 2734/// ActOnParamDefaultArgument event for this parameter. 2735void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2736 if (!ParamD) 2737 return; 2738 2739 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2740 2741 // If this parameter has an unparsed default argument, clear it out 2742 // to make way for the parsed default argument. 2743 if (Param->hasUnparsedDefaultArg()) 2744 Param->setDefaultArg(0); 2745 2746 S->AddDecl(DeclPtrTy::make(Param)); 2747 if (Param->getDeclName()) 2748 IdResolver.AddDecl(Param); 2749} 2750 2751/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2752/// processing the delayed method declaration for Method. The method 2753/// declaration is now considered finished. There may be a separate 2754/// ActOnStartOfFunctionDef action later (not necessarily 2755/// immediately!) for this method, if it was also defined inside the 2756/// class body. 2757void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2758 if (!MethodD) 2759 return; 2760 2761 AdjustDeclIfTemplate(MethodD); 2762 2763 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2764 2765 // Now that we have our default arguments, check the constructor 2766 // again. It could produce additional diagnostics or affect whether 2767 // the class has implicitly-declared destructors, among other 2768 // things. 2769 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2770 CheckConstructor(Constructor); 2771 2772 // Check the default arguments, which we may have added. 2773 if (!Method->isInvalidDecl()) 2774 CheckCXXDefaultArguments(Method); 2775} 2776 2777/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2778/// the well-formedness of the constructor declarator @p D with type @p 2779/// R. If there are any errors in the declarator, this routine will 2780/// emit diagnostics and set the invalid bit to true. In any case, the type 2781/// will be updated to reflect a well-formed type for the constructor and 2782/// returned. 2783QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2784 FunctionDecl::StorageClass &SC) { 2785 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2786 2787 // C++ [class.ctor]p3: 2788 // A constructor shall not be virtual (10.3) or static (9.4). A 2789 // constructor can be invoked for a const, volatile or const 2790 // volatile object. A constructor shall not be declared const, 2791 // volatile, or const volatile (9.3.2). 2792 if (isVirtual) { 2793 if (!D.isInvalidType()) 2794 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2795 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2796 << SourceRange(D.getIdentifierLoc()); 2797 D.setInvalidType(); 2798 } 2799 if (SC == FunctionDecl::Static) { 2800 if (!D.isInvalidType()) 2801 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2802 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2803 << SourceRange(D.getIdentifierLoc()); 2804 D.setInvalidType(); 2805 SC = FunctionDecl::None; 2806 } 2807 2808 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2809 if (FTI.TypeQuals != 0) { 2810 if (FTI.TypeQuals & Qualifiers::Const) 2811 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2812 << "const" << SourceRange(D.getIdentifierLoc()); 2813 if (FTI.TypeQuals & Qualifiers::Volatile) 2814 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2815 << "volatile" << SourceRange(D.getIdentifierLoc()); 2816 if (FTI.TypeQuals & Qualifiers::Restrict) 2817 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2818 << "restrict" << SourceRange(D.getIdentifierLoc()); 2819 } 2820 2821 // Rebuild the function type "R" without any type qualifiers (in 2822 // case any of the errors above fired) and with "void" as the 2823 // return type, since constructors don't have return types. 2824 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2825 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2826 Proto->getNumArgs(), 2827 Proto->isVariadic(), 0, 2828 Proto->hasExceptionSpec(), 2829 Proto->hasAnyExceptionSpec(), 2830 Proto->getNumExceptions(), 2831 Proto->exception_begin(), 2832 Proto->getExtInfo()); 2833} 2834 2835/// CheckConstructor - Checks a fully-formed constructor for 2836/// well-formedness, issuing any diagnostics required. Returns true if 2837/// the constructor declarator is invalid. 2838void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2839 CXXRecordDecl *ClassDecl 2840 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2841 if (!ClassDecl) 2842 return Constructor->setInvalidDecl(); 2843 2844 // C++ [class.copy]p3: 2845 // A declaration of a constructor for a class X is ill-formed if 2846 // its first parameter is of type (optionally cv-qualified) X and 2847 // either there are no other parameters or else all other 2848 // parameters have default arguments. 2849 if (!Constructor->isInvalidDecl() && 2850 ((Constructor->getNumParams() == 1) || 2851 (Constructor->getNumParams() > 1 && 2852 Constructor->getParamDecl(1)->hasDefaultArg())) && 2853 Constructor->getTemplateSpecializationKind() 2854 != TSK_ImplicitInstantiation) { 2855 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2856 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2857 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2858 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2859 const char *ConstRef 2860 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2861 : " const &"; 2862 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2863 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 2864 2865 // FIXME: Rather that making the constructor invalid, we should endeavor 2866 // to fix the type. 2867 Constructor->setInvalidDecl(); 2868 } 2869 } 2870 2871 // Notify the class that we've added a constructor. In principle we 2872 // don't need to do this for out-of-line declarations; in practice 2873 // we only instantiate the most recent declaration of a method, so 2874 // we have to call this for everything but friends. 2875 if (!Constructor->getFriendObjectKind()) 2876 ClassDecl->addedConstructor(Context, Constructor); 2877} 2878 2879/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2880/// issuing any diagnostics required. Returns true on error. 2881bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2882 CXXRecordDecl *RD = Destructor->getParent(); 2883 2884 if (Destructor->isVirtual()) { 2885 SourceLocation Loc; 2886 2887 if (!Destructor->isImplicit()) 2888 Loc = Destructor->getLocation(); 2889 else 2890 Loc = RD->getLocation(); 2891 2892 // If we have a virtual destructor, look up the deallocation function 2893 FunctionDecl *OperatorDelete = 0; 2894 DeclarationName Name = 2895 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2896 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2897 return true; 2898 2899 MarkDeclarationReferenced(Loc, OperatorDelete); 2900 2901 Destructor->setOperatorDelete(OperatorDelete); 2902 } 2903 2904 return false; 2905} 2906 2907static inline bool 2908FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2909 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2910 FTI.ArgInfo[0].Param && 2911 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2912} 2913 2914/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2915/// the well-formednes of the destructor declarator @p D with type @p 2916/// R. If there are any errors in the declarator, this routine will 2917/// emit diagnostics and set the declarator to invalid. Even if this happens, 2918/// will be updated to reflect a well-formed type for the destructor and 2919/// returned. 2920QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 2921 FunctionDecl::StorageClass& SC) { 2922 // C++ [class.dtor]p1: 2923 // [...] A typedef-name that names a class is a class-name 2924 // (7.1.3); however, a typedef-name that names a class shall not 2925 // be used as the identifier in the declarator for a destructor 2926 // declaration. 2927 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2928 if (isa<TypedefType>(DeclaratorType)) 2929 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2930 << DeclaratorType; 2931 2932 // C++ [class.dtor]p2: 2933 // A destructor is used to destroy objects of its class type. A 2934 // destructor takes no parameters, and no return type can be 2935 // specified for it (not even void). The address of a destructor 2936 // shall not be taken. A destructor shall not be static. A 2937 // destructor can be invoked for a const, volatile or const 2938 // volatile object. A destructor shall not be declared const, 2939 // volatile or const volatile (9.3.2). 2940 if (SC == FunctionDecl::Static) { 2941 if (!D.isInvalidType()) 2942 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2943 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2944 << SourceRange(D.getIdentifierLoc()) 2945 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2946 2947 SC = FunctionDecl::None; 2948 } 2949 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2950 // Destructors don't have return types, but the parser will 2951 // happily parse something like: 2952 // 2953 // class X { 2954 // float ~X(); 2955 // }; 2956 // 2957 // The return type will be eliminated later. 2958 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2959 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2960 << SourceRange(D.getIdentifierLoc()); 2961 } 2962 2963 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2964 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2965 if (FTI.TypeQuals & Qualifiers::Const) 2966 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2967 << "const" << SourceRange(D.getIdentifierLoc()); 2968 if (FTI.TypeQuals & Qualifiers::Volatile) 2969 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2970 << "volatile" << SourceRange(D.getIdentifierLoc()); 2971 if (FTI.TypeQuals & Qualifiers::Restrict) 2972 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2973 << "restrict" << SourceRange(D.getIdentifierLoc()); 2974 D.setInvalidType(); 2975 } 2976 2977 // Make sure we don't have any parameters. 2978 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2979 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2980 2981 // Delete the parameters. 2982 FTI.freeArgs(); 2983 D.setInvalidType(); 2984 } 2985 2986 // Make sure the destructor isn't variadic. 2987 if (FTI.isVariadic) { 2988 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2989 D.setInvalidType(); 2990 } 2991 2992 // Rebuild the function type "R" without any type qualifiers or 2993 // parameters (in case any of the errors above fired) and with 2994 // "void" as the return type, since destructors don't have return 2995 // types. 2996 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2997 if (!Proto) 2998 return QualType(); 2999 3000 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3001 Proto->hasExceptionSpec(), 3002 Proto->hasAnyExceptionSpec(), 3003 Proto->getNumExceptions(), 3004 Proto->exception_begin(), 3005 Proto->getExtInfo()); 3006} 3007 3008/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3009/// well-formednes of the conversion function declarator @p D with 3010/// type @p R. If there are any errors in the declarator, this routine 3011/// will emit diagnostics and return true. Otherwise, it will return 3012/// false. Either way, the type @p R will be updated to reflect a 3013/// well-formed type for the conversion operator. 3014void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3015 FunctionDecl::StorageClass& SC) { 3016 // C++ [class.conv.fct]p1: 3017 // Neither parameter types nor return type can be specified. The 3018 // type of a conversion function (8.3.5) is "function taking no 3019 // parameter returning conversion-type-id." 3020 if (SC == FunctionDecl::Static) { 3021 if (!D.isInvalidType()) 3022 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3023 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3024 << SourceRange(D.getIdentifierLoc()); 3025 D.setInvalidType(); 3026 SC = FunctionDecl::None; 3027 } 3028 3029 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3030 3031 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3032 // Conversion functions don't have return types, but the parser will 3033 // happily parse something like: 3034 // 3035 // class X { 3036 // float operator bool(); 3037 // }; 3038 // 3039 // The return type will be changed later anyway. 3040 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3041 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3042 << SourceRange(D.getIdentifierLoc()); 3043 D.setInvalidType(); 3044 } 3045 3046 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3047 3048 // Make sure we don't have any parameters. 3049 if (Proto->getNumArgs() > 0) { 3050 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3051 3052 // Delete the parameters. 3053 D.getTypeObject(0).Fun.freeArgs(); 3054 D.setInvalidType(); 3055 } else if (Proto->isVariadic()) { 3056 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3057 D.setInvalidType(); 3058 } 3059 3060 // Diagnose "&operator bool()" and other such nonsense. This 3061 // is actually a gcc extension which we don't support. 3062 if (Proto->getResultType() != ConvType) { 3063 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3064 << Proto->getResultType(); 3065 D.setInvalidType(); 3066 ConvType = Proto->getResultType(); 3067 } 3068 3069 // C++ [class.conv.fct]p4: 3070 // The conversion-type-id shall not represent a function type nor 3071 // an array type. 3072 if (ConvType->isArrayType()) { 3073 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3074 ConvType = Context.getPointerType(ConvType); 3075 D.setInvalidType(); 3076 } else if (ConvType->isFunctionType()) { 3077 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3078 ConvType = Context.getPointerType(ConvType); 3079 D.setInvalidType(); 3080 } 3081 3082 // Rebuild the function type "R" without any parameters (in case any 3083 // of the errors above fired) and with the conversion type as the 3084 // return type. 3085 if (D.isInvalidType()) { 3086 R = Context.getFunctionType(ConvType, 0, 0, false, 3087 Proto->getTypeQuals(), 3088 Proto->hasExceptionSpec(), 3089 Proto->hasAnyExceptionSpec(), 3090 Proto->getNumExceptions(), 3091 Proto->exception_begin(), 3092 Proto->getExtInfo()); 3093 } 3094 3095 // C++0x explicit conversion operators. 3096 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3097 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3098 diag::warn_explicit_conversion_functions) 3099 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3100} 3101 3102/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3103/// the declaration of the given C++ conversion function. This routine 3104/// is responsible for recording the conversion function in the C++ 3105/// class, if possible. 3106Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3107 assert(Conversion && "Expected to receive a conversion function declaration"); 3108 3109 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3110 3111 // Make sure we aren't redeclaring the conversion function. 3112 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3113 3114 // C++ [class.conv.fct]p1: 3115 // [...] A conversion function is never used to convert a 3116 // (possibly cv-qualified) object to the (possibly cv-qualified) 3117 // same object type (or a reference to it), to a (possibly 3118 // cv-qualified) base class of that type (or a reference to it), 3119 // or to (possibly cv-qualified) void. 3120 // FIXME: Suppress this warning if the conversion function ends up being a 3121 // virtual function that overrides a virtual function in a base class. 3122 QualType ClassType 3123 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3124 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3125 ConvType = ConvTypeRef->getPointeeType(); 3126 if (ConvType->isRecordType()) { 3127 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3128 if (ConvType == ClassType) 3129 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3130 << ClassType; 3131 else if (IsDerivedFrom(ClassType, ConvType)) 3132 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3133 << ClassType << ConvType; 3134 } else if (ConvType->isVoidType()) { 3135 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3136 << ClassType << ConvType; 3137 } 3138 3139 if (Conversion->getPrimaryTemplate()) { 3140 // ignore specializations 3141 } else if (Conversion->getPreviousDeclaration()) { 3142 if (FunctionTemplateDecl *ConversionTemplate 3143 = Conversion->getDescribedFunctionTemplate()) { 3144 if (ClassDecl->replaceConversion( 3145 ConversionTemplate->getPreviousDeclaration(), 3146 ConversionTemplate)) 3147 return DeclPtrTy::make(ConversionTemplate); 3148 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3149 Conversion)) 3150 return DeclPtrTy::make(Conversion); 3151 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3152 } else if (FunctionTemplateDecl *ConversionTemplate 3153 = Conversion->getDescribedFunctionTemplate()) 3154 ClassDecl->addConversionFunction(ConversionTemplate); 3155 else 3156 ClassDecl->addConversionFunction(Conversion); 3157 3158 return DeclPtrTy::make(Conversion); 3159} 3160 3161//===----------------------------------------------------------------------===// 3162// Namespace Handling 3163//===----------------------------------------------------------------------===// 3164 3165/// ActOnStartNamespaceDef - This is called at the start of a namespace 3166/// definition. 3167Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3168 SourceLocation IdentLoc, 3169 IdentifierInfo *II, 3170 SourceLocation LBrace, 3171 AttributeList *AttrList) { 3172 NamespaceDecl *Namespc = 3173 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3174 Namespc->setLBracLoc(LBrace); 3175 3176 Scope *DeclRegionScope = NamespcScope->getParent(); 3177 3178 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3179 3180 if (II) { 3181 // C++ [namespace.def]p2: 3182 // The identifier in an original-namespace-definition shall not have been 3183 // previously defined in the declarative region in which the 3184 // original-namespace-definition appears. The identifier in an 3185 // original-namespace-definition is the name of the namespace. Subsequently 3186 // in that declarative region, it is treated as an original-namespace-name. 3187 3188 NamedDecl *PrevDecl 3189 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3190 ForRedeclaration); 3191 3192 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3193 // This is an extended namespace definition. 3194 // Attach this namespace decl to the chain of extended namespace 3195 // definitions. 3196 OrigNS->setNextNamespace(Namespc); 3197 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3198 3199 // Remove the previous declaration from the scope. 3200 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3201 IdResolver.RemoveDecl(OrigNS); 3202 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3203 } 3204 } else if (PrevDecl) { 3205 // This is an invalid name redefinition. 3206 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3207 << Namespc->getDeclName(); 3208 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3209 Namespc->setInvalidDecl(); 3210 // Continue on to push Namespc as current DeclContext and return it. 3211 } else if (II->isStr("std") && 3212 CurContext->getLookupContext()->isTranslationUnit()) { 3213 // This is the first "real" definition of the namespace "std", so update 3214 // our cache of the "std" namespace to point at this definition. 3215 if (StdNamespace) { 3216 // We had already defined a dummy namespace "std". Link this new 3217 // namespace definition to the dummy namespace "std". 3218 StdNamespace->setNextNamespace(Namespc); 3219 StdNamespace->setLocation(IdentLoc); 3220 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3221 } 3222 3223 // Make our StdNamespace cache point at the first real definition of the 3224 // "std" namespace. 3225 StdNamespace = Namespc; 3226 } 3227 3228 PushOnScopeChains(Namespc, DeclRegionScope); 3229 } else { 3230 // Anonymous namespaces. 3231 assert(Namespc->isAnonymousNamespace()); 3232 3233 // Link the anonymous namespace into its parent. 3234 NamespaceDecl *PrevDecl; 3235 DeclContext *Parent = CurContext->getLookupContext(); 3236 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3237 PrevDecl = TU->getAnonymousNamespace(); 3238 TU->setAnonymousNamespace(Namespc); 3239 } else { 3240 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3241 PrevDecl = ND->getAnonymousNamespace(); 3242 ND->setAnonymousNamespace(Namespc); 3243 } 3244 3245 // Link the anonymous namespace with its previous declaration. 3246 if (PrevDecl) { 3247 assert(PrevDecl->isAnonymousNamespace()); 3248 assert(!PrevDecl->getNextNamespace()); 3249 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3250 PrevDecl->setNextNamespace(Namespc); 3251 } 3252 3253 CurContext->addDecl(Namespc); 3254 3255 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3256 // behaves as if it were replaced by 3257 // namespace unique { /* empty body */ } 3258 // using namespace unique; 3259 // namespace unique { namespace-body } 3260 // where all occurrences of 'unique' in a translation unit are 3261 // replaced by the same identifier and this identifier differs 3262 // from all other identifiers in the entire program. 3263 3264 // We just create the namespace with an empty name and then add an 3265 // implicit using declaration, just like the standard suggests. 3266 // 3267 // CodeGen enforces the "universally unique" aspect by giving all 3268 // declarations semantically contained within an anonymous 3269 // namespace internal linkage. 3270 3271 if (!PrevDecl) { 3272 UsingDirectiveDecl* UD 3273 = UsingDirectiveDecl::Create(Context, CurContext, 3274 /* 'using' */ LBrace, 3275 /* 'namespace' */ SourceLocation(), 3276 /* qualifier */ SourceRange(), 3277 /* NNS */ NULL, 3278 /* identifier */ SourceLocation(), 3279 Namespc, 3280 /* Ancestor */ CurContext); 3281 UD->setImplicit(); 3282 CurContext->addDecl(UD); 3283 } 3284 } 3285 3286 // Although we could have an invalid decl (i.e. the namespace name is a 3287 // redefinition), push it as current DeclContext and try to continue parsing. 3288 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3289 // for the namespace has the declarations that showed up in that particular 3290 // namespace definition. 3291 PushDeclContext(NamespcScope, Namespc); 3292 return DeclPtrTy::make(Namespc); 3293} 3294 3295/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3296/// is a namespace alias, returns the namespace it points to. 3297static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3298 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3299 return AD->getNamespace(); 3300 return dyn_cast_or_null<NamespaceDecl>(D); 3301} 3302 3303/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3304/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3305void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3306 Decl *Dcl = D.getAs<Decl>(); 3307 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3308 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3309 Namespc->setRBracLoc(RBrace); 3310 PopDeclContext(); 3311} 3312 3313/// \brief Retrieve the special "std" namespace, which may require us to 3314/// implicitly define the namespace. 3315NamespaceDecl *Sema::getStdNamespace() { 3316 if (!StdNamespace) { 3317 // The "std" namespace has not yet been defined, so build one implicitly. 3318 StdNamespace = NamespaceDecl::Create(Context, 3319 Context.getTranslationUnitDecl(), 3320 SourceLocation(), 3321 &PP.getIdentifierTable().get("std")); 3322 StdNamespace->setImplicit(true); 3323 } 3324 3325 return StdNamespace; 3326} 3327 3328Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3329 SourceLocation UsingLoc, 3330 SourceLocation NamespcLoc, 3331 CXXScopeSpec &SS, 3332 SourceLocation IdentLoc, 3333 IdentifierInfo *NamespcName, 3334 AttributeList *AttrList) { 3335 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3336 assert(NamespcName && "Invalid NamespcName."); 3337 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3338 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3339 3340 UsingDirectiveDecl *UDir = 0; 3341 NestedNameSpecifier *Qualifier = 0; 3342 if (SS.isSet()) 3343 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3344 3345 // Lookup namespace name. 3346 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3347 LookupParsedName(R, S, &SS); 3348 if (R.isAmbiguous()) 3349 return DeclPtrTy(); 3350 3351 if (R.empty()) { 3352 // Allow "using namespace std;" or "using namespace ::std;" even if 3353 // "std" hasn't been defined yet, for GCC compatibility. 3354 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3355 NamespcName->isStr("std")) { 3356 Diag(IdentLoc, diag::ext_using_undefined_std); 3357 R.addDecl(getStdNamespace()); 3358 R.resolveKind(); 3359 } 3360 // Otherwise, attempt typo correction. 3361 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3362 CTC_NoKeywords, 0)) { 3363 if (R.getAsSingle<NamespaceDecl>() || 3364 R.getAsSingle<NamespaceAliasDecl>()) { 3365 if (DeclContext *DC = computeDeclContext(SS, false)) 3366 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3367 << NamespcName << DC << Corrected << SS.getRange() 3368 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3369 else 3370 Diag(IdentLoc, diag::err_using_directive_suggest) 3371 << NamespcName << Corrected 3372 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3373 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3374 << Corrected; 3375 3376 NamespcName = Corrected.getAsIdentifierInfo(); 3377 } else { 3378 R.clear(); 3379 R.setLookupName(NamespcName); 3380 } 3381 } 3382 } 3383 3384 if (!R.empty()) { 3385 NamedDecl *Named = R.getFoundDecl(); 3386 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3387 && "expected namespace decl"); 3388 // C++ [namespace.udir]p1: 3389 // A using-directive specifies that the names in the nominated 3390 // namespace can be used in the scope in which the 3391 // using-directive appears after the using-directive. During 3392 // unqualified name lookup (3.4.1), the names appear as if they 3393 // were declared in the nearest enclosing namespace which 3394 // contains both the using-directive and the nominated 3395 // namespace. [Note: in this context, "contains" means "contains 3396 // directly or indirectly". ] 3397 3398 // Find enclosing context containing both using-directive and 3399 // nominated namespace. 3400 NamespaceDecl *NS = getNamespaceDecl(Named); 3401 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3402 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3403 CommonAncestor = CommonAncestor->getParent(); 3404 3405 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3406 SS.getRange(), 3407 (NestedNameSpecifier *)SS.getScopeRep(), 3408 IdentLoc, Named, CommonAncestor); 3409 PushUsingDirective(S, UDir); 3410 } else { 3411 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3412 } 3413 3414 // FIXME: We ignore attributes for now. 3415 delete AttrList; 3416 return DeclPtrTy::make(UDir); 3417} 3418 3419void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3420 // If scope has associated entity, then using directive is at namespace 3421 // or translation unit scope. We add UsingDirectiveDecls, into 3422 // it's lookup structure. 3423 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3424 Ctx->addDecl(UDir); 3425 else 3426 // Otherwise it is block-sope. using-directives will affect lookup 3427 // only to the end of scope. 3428 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3429} 3430 3431 3432Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3433 AccessSpecifier AS, 3434 bool HasUsingKeyword, 3435 SourceLocation UsingLoc, 3436 CXXScopeSpec &SS, 3437 UnqualifiedId &Name, 3438 AttributeList *AttrList, 3439 bool IsTypeName, 3440 SourceLocation TypenameLoc) { 3441 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3442 3443 switch (Name.getKind()) { 3444 case UnqualifiedId::IK_Identifier: 3445 case UnqualifiedId::IK_OperatorFunctionId: 3446 case UnqualifiedId::IK_LiteralOperatorId: 3447 case UnqualifiedId::IK_ConversionFunctionId: 3448 break; 3449 3450 case UnqualifiedId::IK_ConstructorName: 3451 case UnqualifiedId::IK_ConstructorTemplateId: 3452 // C++0x inherited constructors. 3453 if (getLangOptions().CPlusPlus0x) break; 3454 3455 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3456 << SS.getRange(); 3457 return DeclPtrTy(); 3458 3459 case UnqualifiedId::IK_DestructorName: 3460 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3461 << SS.getRange(); 3462 return DeclPtrTy(); 3463 3464 case UnqualifiedId::IK_TemplateId: 3465 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3466 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3467 return DeclPtrTy(); 3468 } 3469 3470 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3471 if (!TargetName) 3472 return DeclPtrTy(); 3473 3474 // Warn about using declarations. 3475 // TODO: store that the declaration was written without 'using' and 3476 // talk about access decls instead of using decls in the 3477 // diagnostics. 3478 if (!HasUsingKeyword) { 3479 UsingLoc = Name.getSourceRange().getBegin(); 3480 3481 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3482 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3483 } 3484 3485 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3486 Name.getSourceRange().getBegin(), 3487 TargetName, AttrList, 3488 /* IsInstantiation */ false, 3489 IsTypeName, TypenameLoc); 3490 if (UD) 3491 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3492 3493 return DeclPtrTy::make(UD); 3494} 3495 3496/// \brief Determine whether a using declaration considers the given 3497/// declarations as "equivalent", e.g., if they are redeclarations of 3498/// the same entity or are both typedefs of the same type. 3499static bool 3500IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3501 bool &SuppressRedeclaration) { 3502 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3503 SuppressRedeclaration = false; 3504 return true; 3505 } 3506 3507 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3508 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3509 SuppressRedeclaration = true; 3510 return Context.hasSameType(TD1->getUnderlyingType(), 3511 TD2->getUnderlyingType()); 3512 } 3513 3514 return false; 3515} 3516 3517 3518/// Determines whether to create a using shadow decl for a particular 3519/// decl, given the set of decls existing prior to this using lookup. 3520bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3521 const LookupResult &Previous) { 3522 // Diagnose finding a decl which is not from a base class of the 3523 // current class. We do this now because there are cases where this 3524 // function will silently decide not to build a shadow decl, which 3525 // will pre-empt further diagnostics. 3526 // 3527 // We don't need to do this in C++0x because we do the check once on 3528 // the qualifier. 3529 // 3530 // FIXME: diagnose the following if we care enough: 3531 // struct A { int foo; }; 3532 // struct B : A { using A::foo; }; 3533 // template <class T> struct C : A {}; 3534 // template <class T> struct D : C<T> { using B::foo; } // <--- 3535 // This is invalid (during instantiation) in C++03 because B::foo 3536 // resolves to the using decl in B, which is not a base class of D<T>. 3537 // We can't diagnose it immediately because C<T> is an unknown 3538 // specialization. The UsingShadowDecl in D<T> then points directly 3539 // to A::foo, which will look well-formed when we instantiate. 3540 // The right solution is to not collapse the shadow-decl chain. 3541 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3542 DeclContext *OrigDC = Orig->getDeclContext(); 3543 3544 // Handle enums and anonymous structs. 3545 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3546 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3547 while (OrigRec->isAnonymousStructOrUnion()) 3548 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3549 3550 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3551 if (OrigDC == CurContext) { 3552 Diag(Using->getLocation(), 3553 diag::err_using_decl_nested_name_specifier_is_current_class) 3554 << Using->getNestedNameRange(); 3555 Diag(Orig->getLocation(), diag::note_using_decl_target); 3556 return true; 3557 } 3558 3559 Diag(Using->getNestedNameRange().getBegin(), 3560 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3561 << Using->getTargetNestedNameDecl() 3562 << cast<CXXRecordDecl>(CurContext) 3563 << Using->getNestedNameRange(); 3564 Diag(Orig->getLocation(), diag::note_using_decl_target); 3565 return true; 3566 } 3567 } 3568 3569 if (Previous.empty()) return false; 3570 3571 NamedDecl *Target = Orig; 3572 if (isa<UsingShadowDecl>(Target)) 3573 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3574 3575 // If the target happens to be one of the previous declarations, we 3576 // don't have a conflict. 3577 // 3578 // FIXME: but we might be increasing its access, in which case we 3579 // should redeclare it. 3580 NamedDecl *NonTag = 0, *Tag = 0; 3581 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3582 I != E; ++I) { 3583 NamedDecl *D = (*I)->getUnderlyingDecl(); 3584 bool Result; 3585 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3586 return Result; 3587 3588 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3589 } 3590 3591 if (Target->isFunctionOrFunctionTemplate()) { 3592 FunctionDecl *FD; 3593 if (isa<FunctionTemplateDecl>(Target)) 3594 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3595 else 3596 FD = cast<FunctionDecl>(Target); 3597 3598 NamedDecl *OldDecl = 0; 3599 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3600 case Ovl_Overload: 3601 return false; 3602 3603 case Ovl_NonFunction: 3604 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3605 break; 3606 3607 // We found a decl with the exact signature. 3608 case Ovl_Match: 3609 // If we're in a record, we want to hide the target, so we 3610 // return true (without a diagnostic) to tell the caller not to 3611 // build a shadow decl. 3612 if (CurContext->isRecord()) 3613 return true; 3614 3615 // If we're not in a record, this is an error. 3616 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3617 break; 3618 } 3619 3620 Diag(Target->getLocation(), diag::note_using_decl_target); 3621 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3622 return true; 3623 } 3624 3625 // Target is not a function. 3626 3627 if (isa<TagDecl>(Target)) { 3628 // No conflict between a tag and a non-tag. 3629 if (!Tag) return false; 3630 3631 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3632 Diag(Target->getLocation(), diag::note_using_decl_target); 3633 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3634 return true; 3635 } 3636 3637 // No conflict between a tag and a non-tag. 3638 if (!NonTag) return false; 3639 3640 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3641 Diag(Target->getLocation(), diag::note_using_decl_target); 3642 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3643 return true; 3644} 3645 3646/// Builds a shadow declaration corresponding to a 'using' declaration. 3647UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3648 UsingDecl *UD, 3649 NamedDecl *Orig) { 3650 3651 // If we resolved to another shadow declaration, just coalesce them. 3652 NamedDecl *Target = Orig; 3653 if (isa<UsingShadowDecl>(Target)) { 3654 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3655 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3656 } 3657 3658 UsingShadowDecl *Shadow 3659 = UsingShadowDecl::Create(Context, CurContext, 3660 UD->getLocation(), UD, Target); 3661 UD->addShadowDecl(Shadow); 3662 3663 if (S) 3664 PushOnScopeChains(Shadow, S); 3665 else 3666 CurContext->addDecl(Shadow); 3667 Shadow->setAccess(UD->getAccess()); 3668 3669 // Register it as a conversion if appropriate. 3670 if (Shadow->getDeclName().getNameKind() 3671 == DeclarationName::CXXConversionFunctionName) 3672 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3673 3674 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3675 Shadow->setInvalidDecl(); 3676 3677 return Shadow; 3678} 3679 3680/// Hides a using shadow declaration. This is required by the current 3681/// using-decl implementation when a resolvable using declaration in a 3682/// class is followed by a declaration which would hide or override 3683/// one or more of the using decl's targets; for example: 3684/// 3685/// struct Base { void foo(int); }; 3686/// struct Derived : Base { 3687/// using Base::foo; 3688/// void foo(int); 3689/// }; 3690/// 3691/// The governing language is C++03 [namespace.udecl]p12: 3692/// 3693/// When a using-declaration brings names from a base class into a 3694/// derived class scope, member functions in the derived class 3695/// override and/or hide member functions with the same name and 3696/// parameter types in a base class (rather than conflicting). 3697/// 3698/// There are two ways to implement this: 3699/// (1) optimistically create shadow decls when they're not hidden 3700/// by existing declarations, or 3701/// (2) don't create any shadow decls (or at least don't make them 3702/// visible) until we've fully parsed/instantiated the class. 3703/// The problem with (1) is that we might have to retroactively remove 3704/// a shadow decl, which requires several O(n) operations because the 3705/// decl structures are (very reasonably) not designed for removal. 3706/// (2) avoids this but is very fiddly and phase-dependent. 3707void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3708 if (Shadow->getDeclName().getNameKind() == 3709 DeclarationName::CXXConversionFunctionName) 3710 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3711 3712 // Remove it from the DeclContext... 3713 Shadow->getDeclContext()->removeDecl(Shadow); 3714 3715 // ...and the scope, if applicable... 3716 if (S) { 3717 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3718 IdResolver.RemoveDecl(Shadow); 3719 } 3720 3721 // ...and the using decl. 3722 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3723 3724 // TODO: complain somehow if Shadow was used. It shouldn't 3725 // be possible for this to happen, because...? 3726} 3727 3728/// Builds a using declaration. 3729/// 3730/// \param IsInstantiation - Whether this call arises from an 3731/// instantiation of an unresolved using declaration. We treat 3732/// the lookup differently for these declarations. 3733NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3734 SourceLocation UsingLoc, 3735 CXXScopeSpec &SS, 3736 SourceLocation IdentLoc, 3737 DeclarationName Name, 3738 AttributeList *AttrList, 3739 bool IsInstantiation, 3740 bool IsTypeName, 3741 SourceLocation TypenameLoc) { 3742 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3743 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3744 3745 // FIXME: We ignore attributes for now. 3746 delete AttrList; 3747 3748 if (SS.isEmpty()) { 3749 Diag(IdentLoc, diag::err_using_requires_qualname); 3750 return 0; 3751 } 3752 3753 // Do the redeclaration lookup in the current scope. 3754 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3755 ForRedeclaration); 3756 Previous.setHideTags(false); 3757 if (S) { 3758 LookupName(Previous, S); 3759 3760 // It is really dumb that we have to do this. 3761 LookupResult::Filter F = Previous.makeFilter(); 3762 while (F.hasNext()) { 3763 NamedDecl *D = F.next(); 3764 if (!isDeclInScope(D, CurContext, S)) 3765 F.erase(); 3766 } 3767 F.done(); 3768 } else { 3769 assert(IsInstantiation && "no scope in non-instantiation"); 3770 assert(CurContext->isRecord() && "scope not record in instantiation"); 3771 LookupQualifiedName(Previous, CurContext); 3772 } 3773 3774 NestedNameSpecifier *NNS = 3775 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3776 3777 // Check for invalid redeclarations. 3778 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3779 return 0; 3780 3781 // Check for bad qualifiers. 3782 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3783 return 0; 3784 3785 DeclContext *LookupContext = computeDeclContext(SS); 3786 NamedDecl *D; 3787 if (!LookupContext) { 3788 if (IsTypeName) { 3789 // FIXME: not all declaration name kinds are legal here 3790 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3791 UsingLoc, TypenameLoc, 3792 SS.getRange(), NNS, 3793 IdentLoc, Name); 3794 } else { 3795 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3796 UsingLoc, SS.getRange(), NNS, 3797 IdentLoc, Name); 3798 } 3799 } else { 3800 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3801 SS.getRange(), UsingLoc, NNS, Name, 3802 IsTypeName); 3803 } 3804 D->setAccess(AS); 3805 CurContext->addDecl(D); 3806 3807 if (!LookupContext) return D; 3808 UsingDecl *UD = cast<UsingDecl>(D); 3809 3810 if (RequireCompleteDeclContext(SS, LookupContext)) { 3811 UD->setInvalidDecl(); 3812 return UD; 3813 } 3814 3815 // Look up the target name. 3816 3817 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3818 3819 // Unlike most lookups, we don't always want to hide tag 3820 // declarations: tag names are visible through the using declaration 3821 // even if hidden by ordinary names, *except* in a dependent context 3822 // where it's important for the sanity of two-phase lookup. 3823 if (!IsInstantiation) 3824 R.setHideTags(false); 3825 3826 LookupQualifiedName(R, LookupContext); 3827 3828 if (R.empty()) { 3829 Diag(IdentLoc, diag::err_no_member) 3830 << Name << LookupContext << SS.getRange(); 3831 UD->setInvalidDecl(); 3832 return UD; 3833 } 3834 3835 if (R.isAmbiguous()) { 3836 UD->setInvalidDecl(); 3837 return UD; 3838 } 3839 3840 if (IsTypeName) { 3841 // If we asked for a typename and got a non-type decl, error out. 3842 if (!R.getAsSingle<TypeDecl>()) { 3843 Diag(IdentLoc, diag::err_using_typename_non_type); 3844 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3845 Diag((*I)->getUnderlyingDecl()->getLocation(), 3846 diag::note_using_decl_target); 3847 UD->setInvalidDecl(); 3848 return UD; 3849 } 3850 } else { 3851 // If we asked for a non-typename and we got a type, error out, 3852 // but only if this is an instantiation of an unresolved using 3853 // decl. Otherwise just silently find the type name. 3854 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3855 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3856 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3857 UD->setInvalidDecl(); 3858 return UD; 3859 } 3860 } 3861 3862 // C++0x N2914 [namespace.udecl]p6: 3863 // A using-declaration shall not name a namespace. 3864 if (R.getAsSingle<NamespaceDecl>()) { 3865 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3866 << SS.getRange(); 3867 UD->setInvalidDecl(); 3868 return UD; 3869 } 3870 3871 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3872 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3873 BuildUsingShadowDecl(S, UD, *I); 3874 } 3875 3876 return UD; 3877} 3878 3879/// Checks that the given using declaration is not an invalid 3880/// redeclaration. Note that this is checking only for the using decl 3881/// itself, not for any ill-formedness among the UsingShadowDecls. 3882bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3883 bool isTypeName, 3884 const CXXScopeSpec &SS, 3885 SourceLocation NameLoc, 3886 const LookupResult &Prev) { 3887 // C++03 [namespace.udecl]p8: 3888 // C++0x [namespace.udecl]p10: 3889 // A using-declaration is a declaration and can therefore be used 3890 // repeatedly where (and only where) multiple declarations are 3891 // allowed. 3892 // 3893 // That's in non-member contexts. 3894 if (!CurContext->getLookupContext()->isRecord()) 3895 return false; 3896 3897 NestedNameSpecifier *Qual 3898 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3899 3900 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3901 NamedDecl *D = *I; 3902 3903 bool DTypename; 3904 NestedNameSpecifier *DQual; 3905 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3906 DTypename = UD->isTypeName(); 3907 DQual = UD->getTargetNestedNameDecl(); 3908 } else if (UnresolvedUsingValueDecl *UD 3909 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3910 DTypename = false; 3911 DQual = UD->getTargetNestedNameSpecifier(); 3912 } else if (UnresolvedUsingTypenameDecl *UD 3913 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3914 DTypename = true; 3915 DQual = UD->getTargetNestedNameSpecifier(); 3916 } else continue; 3917 3918 // using decls differ if one says 'typename' and the other doesn't. 3919 // FIXME: non-dependent using decls? 3920 if (isTypeName != DTypename) continue; 3921 3922 // using decls differ if they name different scopes (but note that 3923 // template instantiation can cause this check to trigger when it 3924 // didn't before instantiation). 3925 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3926 Context.getCanonicalNestedNameSpecifier(DQual)) 3927 continue; 3928 3929 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3930 Diag(D->getLocation(), diag::note_using_decl) << 1; 3931 return true; 3932 } 3933 3934 return false; 3935} 3936 3937 3938/// Checks that the given nested-name qualifier used in a using decl 3939/// in the current context is appropriately related to the current 3940/// scope. If an error is found, diagnoses it and returns true. 3941bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3942 const CXXScopeSpec &SS, 3943 SourceLocation NameLoc) { 3944 DeclContext *NamedContext = computeDeclContext(SS); 3945 3946 if (!CurContext->isRecord()) { 3947 // C++03 [namespace.udecl]p3: 3948 // C++0x [namespace.udecl]p8: 3949 // A using-declaration for a class member shall be a member-declaration. 3950 3951 // If we weren't able to compute a valid scope, it must be a 3952 // dependent class scope. 3953 if (!NamedContext || NamedContext->isRecord()) { 3954 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3955 << SS.getRange(); 3956 return true; 3957 } 3958 3959 // Otherwise, everything is known to be fine. 3960 return false; 3961 } 3962 3963 // The current scope is a record. 3964 3965 // If the named context is dependent, we can't decide much. 3966 if (!NamedContext) { 3967 // FIXME: in C++0x, we can diagnose if we can prove that the 3968 // nested-name-specifier does not refer to a base class, which is 3969 // still possible in some cases. 3970 3971 // Otherwise we have to conservatively report that things might be 3972 // okay. 3973 return false; 3974 } 3975 3976 if (!NamedContext->isRecord()) { 3977 // Ideally this would point at the last name in the specifier, 3978 // but we don't have that level of source info. 3979 Diag(SS.getRange().getBegin(), 3980 diag::err_using_decl_nested_name_specifier_is_not_class) 3981 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3982 return true; 3983 } 3984 3985 if (getLangOptions().CPlusPlus0x) { 3986 // C++0x [namespace.udecl]p3: 3987 // In a using-declaration used as a member-declaration, the 3988 // nested-name-specifier shall name a base class of the class 3989 // being defined. 3990 3991 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3992 cast<CXXRecordDecl>(NamedContext))) { 3993 if (CurContext == NamedContext) { 3994 Diag(NameLoc, 3995 diag::err_using_decl_nested_name_specifier_is_current_class) 3996 << SS.getRange(); 3997 return true; 3998 } 3999 4000 Diag(SS.getRange().getBegin(), 4001 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4002 << (NestedNameSpecifier*) SS.getScopeRep() 4003 << cast<CXXRecordDecl>(CurContext) 4004 << SS.getRange(); 4005 return true; 4006 } 4007 4008 return false; 4009 } 4010 4011 // C++03 [namespace.udecl]p4: 4012 // A using-declaration used as a member-declaration shall refer 4013 // to a member of a base class of the class being defined [etc.]. 4014 4015 // Salient point: SS doesn't have to name a base class as long as 4016 // lookup only finds members from base classes. Therefore we can 4017 // diagnose here only if we can prove that that can't happen, 4018 // i.e. if the class hierarchies provably don't intersect. 4019 4020 // TODO: it would be nice if "definitely valid" results were cached 4021 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4022 // need to be repeated. 4023 4024 struct UserData { 4025 llvm::DenseSet<const CXXRecordDecl*> Bases; 4026 4027 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4028 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4029 Data->Bases.insert(Base); 4030 return true; 4031 } 4032 4033 bool hasDependentBases(const CXXRecordDecl *Class) { 4034 return !Class->forallBases(collect, this); 4035 } 4036 4037 /// Returns true if the base is dependent or is one of the 4038 /// accumulated base classes. 4039 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4040 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4041 return !Data->Bases.count(Base); 4042 } 4043 4044 bool mightShareBases(const CXXRecordDecl *Class) { 4045 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4046 } 4047 }; 4048 4049 UserData Data; 4050 4051 // Returns false if we find a dependent base. 4052 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4053 return false; 4054 4055 // Returns false if the class has a dependent base or if it or one 4056 // of its bases is present in the base set of the current context. 4057 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4058 return false; 4059 4060 Diag(SS.getRange().getBegin(), 4061 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4062 << (NestedNameSpecifier*) SS.getScopeRep() 4063 << cast<CXXRecordDecl>(CurContext) 4064 << SS.getRange(); 4065 4066 return true; 4067} 4068 4069Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 4070 SourceLocation NamespaceLoc, 4071 SourceLocation AliasLoc, 4072 IdentifierInfo *Alias, 4073 CXXScopeSpec &SS, 4074 SourceLocation IdentLoc, 4075 IdentifierInfo *Ident) { 4076 4077 // Lookup the namespace name. 4078 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4079 LookupParsedName(R, S, &SS); 4080 4081 // Check if we have a previous declaration with the same name. 4082 NamedDecl *PrevDecl 4083 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4084 ForRedeclaration); 4085 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4086 PrevDecl = 0; 4087 4088 if (PrevDecl) { 4089 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4090 // We already have an alias with the same name that points to the same 4091 // namespace, so don't create a new one. 4092 // FIXME: At some point, we'll want to create the (redundant) 4093 // declaration to maintain better source information. 4094 if (!R.isAmbiguous() && !R.empty() && 4095 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4096 return DeclPtrTy(); 4097 } 4098 4099 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4100 diag::err_redefinition_different_kind; 4101 Diag(AliasLoc, DiagID) << Alias; 4102 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4103 return DeclPtrTy(); 4104 } 4105 4106 if (R.isAmbiguous()) 4107 return DeclPtrTy(); 4108 4109 if (R.empty()) { 4110 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4111 CTC_NoKeywords, 0)) { 4112 if (R.getAsSingle<NamespaceDecl>() || 4113 R.getAsSingle<NamespaceAliasDecl>()) { 4114 if (DeclContext *DC = computeDeclContext(SS, false)) 4115 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4116 << Ident << DC << Corrected << SS.getRange() 4117 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4118 else 4119 Diag(IdentLoc, diag::err_using_directive_suggest) 4120 << Ident << Corrected 4121 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4122 4123 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4124 << Corrected; 4125 4126 Ident = Corrected.getAsIdentifierInfo(); 4127 } else { 4128 R.clear(); 4129 R.setLookupName(Ident); 4130 } 4131 } 4132 4133 if (R.empty()) { 4134 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4135 return DeclPtrTy(); 4136 } 4137 } 4138 4139 NamespaceAliasDecl *AliasDecl = 4140 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4141 Alias, SS.getRange(), 4142 (NestedNameSpecifier *)SS.getScopeRep(), 4143 IdentLoc, R.getFoundDecl()); 4144 4145 PushOnScopeChains(AliasDecl, S); 4146 return DeclPtrTy::make(AliasDecl); 4147} 4148 4149namespace { 4150 /// \brief Scoped object used to handle the state changes required in Sema 4151 /// to implicitly define the body of a C++ member function; 4152 class ImplicitlyDefinedFunctionScope { 4153 Sema &S; 4154 DeclContext *PreviousContext; 4155 4156 public: 4157 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4158 : S(S), PreviousContext(S.CurContext) 4159 { 4160 S.CurContext = Method; 4161 S.PushFunctionScope(); 4162 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4163 } 4164 4165 ~ImplicitlyDefinedFunctionScope() { 4166 S.PopExpressionEvaluationContext(); 4167 S.PopFunctionOrBlockScope(); 4168 S.CurContext = PreviousContext; 4169 } 4170 }; 4171} 4172 4173CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4174 CXXRecordDecl *ClassDecl) { 4175 // C++ [class.ctor]p5: 4176 // A default constructor for a class X is a constructor of class X 4177 // that can be called without an argument. If there is no 4178 // user-declared constructor for class X, a default constructor is 4179 // implicitly declared. An implicitly-declared default constructor 4180 // is an inline public member of its class. 4181 assert(!ClassDecl->hasUserDeclaredConstructor() && 4182 "Should not build implicit default constructor!"); 4183 4184 // C++ [except.spec]p14: 4185 // An implicitly declared special member function (Clause 12) shall have an 4186 // exception-specification. [...] 4187 ImplicitExceptionSpecification ExceptSpec(Context); 4188 4189 // Direct base-class destructors. 4190 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4191 BEnd = ClassDecl->bases_end(); 4192 B != BEnd; ++B) { 4193 if (B->isVirtual()) // Handled below. 4194 continue; 4195 4196 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4197 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4198 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4199 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4200 else if (CXXConstructorDecl *Constructor 4201 = BaseClassDecl->getDefaultConstructor()) 4202 ExceptSpec.CalledDecl(Constructor); 4203 } 4204 } 4205 4206 // Virtual base-class destructors. 4207 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4208 BEnd = ClassDecl->vbases_end(); 4209 B != BEnd; ++B) { 4210 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4211 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4212 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4213 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4214 else if (CXXConstructorDecl *Constructor 4215 = BaseClassDecl->getDefaultConstructor()) 4216 ExceptSpec.CalledDecl(Constructor); 4217 } 4218 } 4219 4220 // Field destructors. 4221 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4222 FEnd = ClassDecl->field_end(); 4223 F != FEnd; ++F) { 4224 if (const RecordType *RecordTy 4225 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4226 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4227 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4228 ExceptSpec.CalledDecl( 4229 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4230 else if (CXXConstructorDecl *Constructor 4231 = FieldClassDecl->getDefaultConstructor()) 4232 ExceptSpec.CalledDecl(Constructor); 4233 } 4234 } 4235 4236 4237 // Create the actual constructor declaration. 4238 CanQualType ClassType 4239 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4240 DeclarationName Name 4241 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4242 CXXConstructorDecl *DefaultCon 4243 = CXXConstructorDecl::Create(Context, ClassDecl, 4244 ClassDecl->getLocation(), Name, 4245 Context.getFunctionType(Context.VoidTy, 4246 0, 0, false, 0, 4247 ExceptSpec.hasExceptionSpecification(), 4248 ExceptSpec.hasAnyExceptionSpecification(), 4249 ExceptSpec.size(), 4250 ExceptSpec.data(), 4251 FunctionType::ExtInfo()), 4252 /*TInfo=*/0, 4253 /*isExplicit=*/false, 4254 /*isInline=*/true, 4255 /*isImplicitlyDeclared=*/true); 4256 DefaultCon->setAccess(AS_public); 4257 DefaultCon->setImplicit(); 4258 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4259 4260 // Note that we have declared this constructor. 4261 ClassDecl->setDeclaredDefaultConstructor(true); 4262 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4263 4264 if (Scope *S = getScopeForContext(ClassDecl)) 4265 PushOnScopeChains(DefaultCon, S, false); 4266 ClassDecl->addDecl(DefaultCon); 4267 4268 return DefaultCon; 4269} 4270 4271void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4272 CXXConstructorDecl *Constructor) { 4273 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4274 !Constructor->isUsed(false)) && 4275 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4276 4277 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4278 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4279 4280 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4281 ErrorTrap Trap(*this); 4282 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4283 Trap.hasErrorOccurred()) { 4284 Diag(CurrentLocation, diag::note_member_synthesized_at) 4285 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4286 Constructor->setInvalidDecl(); 4287 } else { 4288 Constructor->setUsed(); 4289 MarkVTableUsed(CurrentLocation, ClassDecl); 4290 } 4291} 4292 4293CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4294 // C++ [class.dtor]p2: 4295 // If a class has no user-declared destructor, a destructor is 4296 // declared implicitly. An implicitly-declared destructor is an 4297 // inline public member of its class. 4298 4299 // C++ [except.spec]p14: 4300 // An implicitly declared special member function (Clause 12) shall have 4301 // an exception-specification. 4302 ImplicitExceptionSpecification ExceptSpec(Context); 4303 4304 // Direct base-class destructors. 4305 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4306 BEnd = ClassDecl->bases_end(); 4307 B != BEnd; ++B) { 4308 if (B->isVirtual()) // Handled below. 4309 continue; 4310 4311 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4312 ExceptSpec.CalledDecl( 4313 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4314 } 4315 4316 // Virtual base-class destructors. 4317 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4318 BEnd = ClassDecl->vbases_end(); 4319 B != BEnd; ++B) { 4320 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4321 ExceptSpec.CalledDecl( 4322 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4323 } 4324 4325 // Field destructors. 4326 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4327 FEnd = ClassDecl->field_end(); 4328 F != FEnd; ++F) { 4329 if (const RecordType *RecordTy 4330 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4331 ExceptSpec.CalledDecl( 4332 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4333 } 4334 4335 // Create the actual destructor declaration. 4336 QualType Ty = Context.getFunctionType(Context.VoidTy, 4337 0, 0, false, 0, 4338 ExceptSpec.hasExceptionSpecification(), 4339 ExceptSpec.hasAnyExceptionSpecification(), 4340 ExceptSpec.size(), 4341 ExceptSpec.data(), 4342 FunctionType::ExtInfo()); 4343 4344 CanQualType ClassType 4345 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4346 DeclarationName Name 4347 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4348 CXXDestructorDecl *Destructor 4349 = CXXDestructorDecl::Create(Context, ClassDecl, 4350 ClassDecl->getLocation(), Name, Ty, 4351 /*isInline=*/true, 4352 /*isImplicitlyDeclared=*/true); 4353 Destructor->setAccess(AS_public); 4354 Destructor->setImplicit(); 4355 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4356 4357 // Note that we have declared this destructor. 4358 ClassDecl->setDeclaredDestructor(true); 4359 ++ASTContext::NumImplicitDestructorsDeclared; 4360 4361 // Introduce this destructor into its scope. 4362 if (Scope *S = getScopeForContext(ClassDecl)) 4363 PushOnScopeChains(Destructor, S, false); 4364 ClassDecl->addDecl(Destructor); 4365 4366 // This could be uniqued if it ever proves significant. 4367 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4368 4369 AddOverriddenMethods(ClassDecl, Destructor); 4370 4371 return Destructor; 4372} 4373 4374void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4375 CXXDestructorDecl *Destructor) { 4376 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4377 "DefineImplicitDestructor - call it for implicit default dtor"); 4378 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4379 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4380 4381 if (Destructor->isInvalidDecl()) 4382 return; 4383 4384 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4385 4386 ErrorTrap Trap(*this); 4387 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4388 Destructor->getParent()); 4389 4390 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4391 Diag(CurrentLocation, diag::note_member_synthesized_at) 4392 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4393 4394 Destructor->setInvalidDecl(); 4395 return; 4396 } 4397 4398 Destructor->setUsed(); 4399 MarkVTableUsed(CurrentLocation, ClassDecl); 4400} 4401 4402/// \brief Builds a statement that copies the given entity from \p From to 4403/// \c To. 4404/// 4405/// This routine is used to copy the members of a class with an 4406/// implicitly-declared copy assignment operator. When the entities being 4407/// copied are arrays, this routine builds for loops to copy them. 4408/// 4409/// \param S The Sema object used for type-checking. 4410/// 4411/// \param Loc The location where the implicit copy is being generated. 4412/// 4413/// \param T The type of the expressions being copied. Both expressions must 4414/// have this type. 4415/// 4416/// \param To The expression we are copying to. 4417/// 4418/// \param From The expression we are copying from. 4419/// 4420/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4421/// Otherwise, it's a non-static member subobject. 4422/// 4423/// \param Depth Internal parameter recording the depth of the recursion. 4424/// 4425/// \returns A statement or a loop that copies the expressions. 4426static Sema::OwningStmtResult 4427BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4428 Sema::OwningExprResult To, Sema::OwningExprResult From, 4429 bool CopyingBaseSubobject, unsigned Depth = 0) { 4430 typedef Sema::OwningStmtResult OwningStmtResult; 4431 typedef Sema::OwningExprResult OwningExprResult; 4432 4433 // C++0x [class.copy]p30: 4434 // Each subobject is assigned in the manner appropriate to its type: 4435 // 4436 // - if the subobject is of class type, the copy assignment operator 4437 // for the class is used (as if by explicit qualification; that is, 4438 // ignoring any possible virtual overriding functions in more derived 4439 // classes); 4440 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4441 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4442 4443 // Look for operator=. 4444 DeclarationName Name 4445 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4446 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4447 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4448 4449 // Filter out any result that isn't a copy-assignment operator. 4450 LookupResult::Filter F = OpLookup.makeFilter(); 4451 while (F.hasNext()) { 4452 NamedDecl *D = F.next(); 4453 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4454 if (Method->isCopyAssignmentOperator()) 4455 continue; 4456 4457 F.erase(); 4458 } 4459 F.done(); 4460 4461 // Suppress the protected check (C++ [class.protected]) for each of the 4462 // assignment operators we found. This strange dance is required when 4463 // we're assigning via a base classes's copy-assignment operator. To 4464 // ensure that we're getting the right base class subobject (without 4465 // ambiguities), we need to cast "this" to that subobject type; to 4466 // ensure that we don't go through the virtual call mechanism, we need 4467 // to qualify the operator= name with the base class (see below). However, 4468 // this means that if the base class has a protected copy assignment 4469 // operator, the protected member access check will fail. So, we 4470 // rewrite "protected" access to "public" access in this case, since we 4471 // know by construction that we're calling from a derived class. 4472 if (CopyingBaseSubobject) { 4473 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4474 L != LEnd; ++L) { 4475 if (L.getAccess() == AS_protected) 4476 L.setAccess(AS_public); 4477 } 4478 } 4479 4480 // Create the nested-name-specifier that will be used to qualify the 4481 // reference to operator=; this is required to suppress the virtual 4482 // call mechanism. 4483 CXXScopeSpec SS; 4484 SS.setRange(Loc); 4485 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4486 T.getTypePtr())); 4487 4488 // Create the reference to operator=. 4489 OwningExprResult OpEqualRef 4490 = S.BuildMemberReferenceExpr(move(To), T, Loc, /*isArrow=*/false, SS, 4491 /*FirstQualifierInScope=*/0, OpLookup, 4492 /*TemplateArgs=*/0, 4493 /*SuppressQualifierCheck=*/true); 4494 if (OpEqualRef.isInvalid()) 4495 return S.StmtError(); 4496 4497 // Build the call to the assignment operator. 4498 Expr *FromE = From.takeAs<Expr>(); 4499 OwningExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4500 OpEqualRef.takeAs<Expr>(), 4501 Loc, &FromE, 1, 0, Loc); 4502 if (Call.isInvalid()) 4503 return S.StmtError(); 4504 4505 return S.Owned(Call.takeAs<Stmt>()); 4506 } 4507 4508 // - if the subobject is of scalar type, the built-in assignment 4509 // operator is used. 4510 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4511 if (!ArrayTy) { 4512 OwningExprResult Assignment = S.CreateBuiltinBinOp(Loc, 4513 BinaryOperator::Assign, 4514 To.takeAs<Expr>(), 4515 From.takeAs<Expr>()); 4516 if (Assignment.isInvalid()) 4517 return S.StmtError(); 4518 4519 return S.Owned(Assignment.takeAs<Stmt>()); 4520 } 4521 4522 // - if the subobject is an array, each element is assigned, in the 4523 // manner appropriate to the element type; 4524 4525 // Construct a loop over the array bounds, e.g., 4526 // 4527 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4528 // 4529 // that will copy each of the array elements. 4530 QualType SizeType = S.Context.getSizeType(); 4531 4532 // Create the iteration variable. 4533 IdentifierInfo *IterationVarName = 0; 4534 { 4535 llvm::SmallString<8> Str; 4536 llvm::raw_svector_ostream OS(Str); 4537 OS << "__i" << Depth; 4538 IterationVarName = &S.Context.Idents.get(OS.str()); 4539 } 4540 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4541 IterationVarName, SizeType, 4542 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4543 VarDecl::None, VarDecl::None); 4544 4545 // Initialize the iteration variable to zero. 4546 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4547 IterationVar->setInit(new (S.Context) IntegerLiteral(Zero, SizeType, Loc)); 4548 4549 // Create a reference to the iteration variable; we'll use this several 4550 // times throughout. 4551 Expr *IterationVarRef 4552 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4553 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4554 4555 // Create the DeclStmt that holds the iteration variable. 4556 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4557 4558 // Create the comparison against the array bound. 4559 llvm::APInt Upper = ArrayTy->getSize(); 4560 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4561 OwningExprResult Comparison 4562 = S.Owned(new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4563 new (S.Context) IntegerLiteral(Upper, SizeType, Loc), 4564 BinaryOperator::NE, S.Context.BoolTy, Loc)); 4565 4566 // Create the pre-increment of the iteration variable. 4567 OwningExprResult Increment 4568 = S.Owned(new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4569 UnaryOperator::PreInc, 4570 SizeType, Loc)); 4571 4572 // Subscript the "from" and "to" expressions with the iteration variable. 4573 From = S.CreateBuiltinArraySubscriptExpr(move(From), Loc, 4574 S.Owned(IterationVarRef->Retain()), 4575 Loc); 4576 To = S.CreateBuiltinArraySubscriptExpr(move(To), Loc, 4577 S.Owned(IterationVarRef->Retain()), 4578 Loc); 4579 assert(!From.isInvalid() && "Builtin subscripting can't fail!"); 4580 assert(!To.isInvalid() && "Builtin subscripting can't fail!"); 4581 4582 // Build the copy for an individual element of the array. 4583 OwningStmtResult Copy = BuildSingleCopyAssign(S, Loc, 4584 ArrayTy->getElementType(), 4585 move(To), move(From), 4586 CopyingBaseSubobject, Depth+1); 4587 if (Copy.isInvalid()) { 4588 InitStmt->Destroy(S.Context); 4589 return S.StmtError(); 4590 } 4591 4592 // Construct the loop that copies all elements of this array. 4593 return S.ActOnForStmt(Loc, Loc, S.Owned(InitStmt), 4594 S.MakeFullExpr(Comparison), 4595 Sema::DeclPtrTy(), 4596 S.MakeFullExpr(Increment), 4597 Loc, move(Copy)); 4598} 4599 4600/// \brief Determine whether the given class has a copy assignment operator 4601/// that accepts a const-qualified argument. 4602static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4603 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4604 4605 if (!Class->hasDeclaredCopyAssignment()) 4606 S.DeclareImplicitCopyAssignment(Class); 4607 4608 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4609 DeclarationName OpName 4610 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4611 4612 DeclContext::lookup_const_iterator Op, OpEnd; 4613 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4614 // C++ [class.copy]p9: 4615 // A user-declared copy assignment operator is a non-static non-template 4616 // member function of class X with exactly one parameter of type X, X&, 4617 // const X&, volatile X& or const volatile X&. 4618 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4619 if (!Method) 4620 continue; 4621 4622 if (Method->isStatic()) 4623 continue; 4624 if (Method->getPrimaryTemplate()) 4625 continue; 4626 const FunctionProtoType *FnType = 4627 Method->getType()->getAs<FunctionProtoType>(); 4628 assert(FnType && "Overloaded operator has no prototype."); 4629 // Don't assert on this; an invalid decl might have been left in the AST. 4630 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4631 continue; 4632 bool AcceptsConst = true; 4633 QualType ArgType = FnType->getArgType(0); 4634 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4635 ArgType = Ref->getPointeeType(); 4636 // Is it a non-const lvalue reference? 4637 if (!ArgType.isConstQualified()) 4638 AcceptsConst = false; 4639 } 4640 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4641 continue; 4642 4643 // We have a single argument of type cv X or cv X&, i.e. we've found the 4644 // copy assignment operator. Return whether it accepts const arguments. 4645 return AcceptsConst; 4646 } 4647 assert(Class->isInvalidDecl() && 4648 "No copy assignment operator declared in valid code."); 4649 return false; 4650} 4651 4652CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4653 // Note: The following rules are largely analoguous to the copy 4654 // constructor rules. Note that virtual bases are not taken into account 4655 // for determining the argument type of the operator. Note also that 4656 // operators taking an object instead of a reference are allowed. 4657 4658 4659 // C++ [class.copy]p10: 4660 // If the class definition does not explicitly declare a copy 4661 // assignment operator, one is declared implicitly. 4662 // The implicitly-defined copy assignment operator for a class X 4663 // will have the form 4664 // 4665 // X& X::operator=(const X&) 4666 // 4667 // if 4668 bool HasConstCopyAssignment = true; 4669 4670 // -- each direct base class B of X has a copy assignment operator 4671 // whose parameter is of type const B&, const volatile B& or B, 4672 // and 4673 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4674 BaseEnd = ClassDecl->bases_end(); 4675 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4676 assert(!Base->getType()->isDependentType() && 4677 "Cannot generate implicit members for class with dependent bases."); 4678 const CXXRecordDecl *BaseClassDecl 4679 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4680 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4681 } 4682 4683 // -- for all the nonstatic data members of X that are of a class 4684 // type M (or array thereof), each such class type has a copy 4685 // assignment operator whose parameter is of type const M&, 4686 // const volatile M& or M. 4687 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4688 FieldEnd = ClassDecl->field_end(); 4689 HasConstCopyAssignment && Field != FieldEnd; 4690 ++Field) { 4691 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4692 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4693 const CXXRecordDecl *FieldClassDecl 4694 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4695 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4696 } 4697 } 4698 4699 // Otherwise, the implicitly declared copy assignment operator will 4700 // have the form 4701 // 4702 // X& X::operator=(X&) 4703 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4704 QualType RetType = Context.getLValueReferenceType(ArgType); 4705 if (HasConstCopyAssignment) 4706 ArgType = ArgType.withConst(); 4707 ArgType = Context.getLValueReferenceType(ArgType); 4708 4709 // C++ [except.spec]p14: 4710 // An implicitly declared special member function (Clause 12) shall have an 4711 // exception-specification. [...] 4712 ImplicitExceptionSpecification ExceptSpec(Context); 4713 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4714 BaseEnd = ClassDecl->bases_end(); 4715 Base != BaseEnd; ++Base) { 4716 CXXRecordDecl *BaseClassDecl 4717 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4718 4719 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4720 DeclareImplicitCopyAssignment(BaseClassDecl); 4721 4722 if (CXXMethodDecl *CopyAssign 4723 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4724 ExceptSpec.CalledDecl(CopyAssign); 4725 } 4726 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4727 FieldEnd = ClassDecl->field_end(); 4728 Field != FieldEnd; 4729 ++Field) { 4730 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4731 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4732 CXXRecordDecl *FieldClassDecl 4733 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4734 4735 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 4736 DeclareImplicitCopyAssignment(FieldClassDecl); 4737 4738 if (CXXMethodDecl *CopyAssign 4739 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4740 ExceptSpec.CalledDecl(CopyAssign); 4741 } 4742 } 4743 4744 // An implicitly-declared copy assignment operator is an inline public 4745 // member of its class. 4746 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4747 CXXMethodDecl *CopyAssignment 4748 = CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 4749 Context.getFunctionType(RetType, &ArgType, 1, 4750 false, 0, 4751 ExceptSpec.hasExceptionSpecification(), 4752 ExceptSpec.hasAnyExceptionSpecification(), 4753 ExceptSpec.size(), 4754 ExceptSpec.data(), 4755 FunctionType::ExtInfo()), 4756 /*TInfo=*/0, /*isStatic=*/false, 4757 /*StorageClassAsWritten=*/FunctionDecl::None, 4758 /*isInline=*/true); 4759 CopyAssignment->setAccess(AS_public); 4760 CopyAssignment->setImplicit(); 4761 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4762 CopyAssignment->setCopyAssignment(true); 4763 4764 // Add the parameter to the operator. 4765 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4766 ClassDecl->getLocation(), 4767 /*Id=*/0, 4768 ArgType, /*TInfo=*/0, 4769 VarDecl::None, 4770 VarDecl::None, 0); 4771 CopyAssignment->setParams(&FromParam, 1); 4772 4773 // Note that we have added this copy-assignment operator. 4774 ClassDecl->setDeclaredCopyAssignment(true); 4775 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 4776 4777 if (Scope *S = getScopeForContext(ClassDecl)) 4778 PushOnScopeChains(CopyAssignment, S, false); 4779 ClassDecl->addDecl(CopyAssignment); 4780 4781 AddOverriddenMethods(ClassDecl, CopyAssignment); 4782 return CopyAssignment; 4783} 4784 4785void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4786 CXXMethodDecl *CopyAssignOperator) { 4787 assert((CopyAssignOperator->isImplicit() && 4788 CopyAssignOperator->isOverloadedOperator() && 4789 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4790 !CopyAssignOperator->isUsed(false)) && 4791 "DefineImplicitCopyAssignment called for wrong function"); 4792 4793 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4794 4795 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4796 CopyAssignOperator->setInvalidDecl(); 4797 return; 4798 } 4799 4800 CopyAssignOperator->setUsed(); 4801 4802 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4803 ErrorTrap Trap(*this); 4804 4805 // C++0x [class.copy]p30: 4806 // The implicitly-defined or explicitly-defaulted copy assignment operator 4807 // for a non-union class X performs memberwise copy assignment of its 4808 // subobjects. The direct base classes of X are assigned first, in the 4809 // order of their declaration in the base-specifier-list, and then the 4810 // immediate non-static data members of X are assigned, in the order in 4811 // which they were declared in the class definition. 4812 4813 // The statements that form the synthesized function body. 4814 ASTOwningVector<&ActionBase::DeleteStmt> Statements(*this); 4815 4816 // The parameter for the "other" object, which we are copying from. 4817 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4818 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4819 QualType OtherRefType = Other->getType(); 4820 if (const LValueReferenceType *OtherRef 4821 = OtherRefType->getAs<LValueReferenceType>()) { 4822 OtherRefType = OtherRef->getPointeeType(); 4823 OtherQuals = OtherRefType.getQualifiers(); 4824 } 4825 4826 // Our location for everything implicitly-generated. 4827 SourceLocation Loc = CopyAssignOperator->getLocation(); 4828 4829 // Construct a reference to the "other" object. We'll be using this 4830 // throughout the generated ASTs. 4831 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4832 assert(OtherRef && "Reference to parameter cannot fail!"); 4833 4834 // Construct the "this" pointer. We'll be using this throughout the generated 4835 // ASTs. 4836 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4837 assert(This && "Reference to this cannot fail!"); 4838 4839 // Assign base classes. 4840 bool Invalid = false; 4841 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4842 E = ClassDecl->bases_end(); Base != E; ++Base) { 4843 // Form the assignment: 4844 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4845 QualType BaseType = Base->getType().getUnqualifiedType(); 4846 CXXRecordDecl *BaseClassDecl = 0; 4847 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4848 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4849 else { 4850 Invalid = true; 4851 continue; 4852 } 4853 4854 // Construct the "from" expression, which is an implicit cast to the 4855 // appropriately-qualified base type. 4856 Expr *From = OtherRef->Retain(); 4857 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4858 CastExpr::CK_UncheckedDerivedToBase, 4859 ImplicitCastExpr::LValue, CXXBaseSpecifierArray(Base)); 4860 4861 // Dereference "this". 4862 OwningExprResult To = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4863 Owned(This->Retain())); 4864 4865 // Implicitly cast "this" to the appropriately-qualified base type. 4866 Expr *ToE = To.takeAs<Expr>(); 4867 ImpCastExprToType(ToE, 4868 Context.getCVRQualifiedType(BaseType, 4869 CopyAssignOperator->getTypeQualifiers()), 4870 CastExpr::CK_UncheckedDerivedToBase, 4871 ImplicitCastExpr::LValue, CXXBaseSpecifierArray(Base)); 4872 To = Owned(ToE); 4873 4874 // Build the copy. 4875 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4876 move(To), Owned(From), 4877 /*CopyingBaseSubobject=*/true); 4878 if (Copy.isInvalid()) { 4879 Diag(CurrentLocation, diag::note_member_synthesized_at) 4880 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4881 CopyAssignOperator->setInvalidDecl(); 4882 return; 4883 } 4884 4885 // Success! Record the copy. 4886 Statements.push_back(Copy.takeAs<Expr>()); 4887 } 4888 4889 // \brief Reference to the __builtin_memcpy function. 4890 Expr *BuiltinMemCpyRef = 0; 4891 // \brief Reference to the __builtin_objc_memmove_collectable function. 4892 Expr *CollectableMemCpyRef = 0; 4893 4894 // Assign non-static members. 4895 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4896 FieldEnd = ClassDecl->field_end(); 4897 Field != FieldEnd; ++Field) { 4898 // Check for members of reference type; we can't copy those. 4899 if (Field->getType()->isReferenceType()) { 4900 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4901 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4902 Diag(Field->getLocation(), diag::note_declared_at); 4903 Diag(CurrentLocation, diag::note_member_synthesized_at) 4904 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4905 Invalid = true; 4906 continue; 4907 } 4908 4909 // Check for members of const-qualified, non-class type. 4910 QualType BaseType = Context.getBaseElementType(Field->getType()); 4911 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4912 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4913 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4914 Diag(Field->getLocation(), diag::note_declared_at); 4915 Diag(CurrentLocation, diag::note_member_synthesized_at) 4916 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4917 Invalid = true; 4918 continue; 4919 } 4920 4921 QualType FieldType = Field->getType().getNonReferenceType(); 4922 if (FieldType->isIncompleteArrayType()) { 4923 assert(ClassDecl->hasFlexibleArrayMember() && 4924 "Incomplete array type is not valid"); 4925 continue; 4926 } 4927 4928 // Build references to the field in the object we're copying from and to. 4929 CXXScopeSpec SS; // Intentionally empty 4930 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 4931 LookupMemberName); 4932 MemberLookup.addDecl(*Field); 4933 MemberLookup.resolveKind(); 4934 OwningExprResult From = BuildMemberReferenceExpr(Owned(OtherRef->Retain()), 4935 OtherRefType, 4936 Loc, /*IsArrow=*/false, 4937 SS, 0, MemberLookup, 0); 4938 OwningExprResult To = BuildMemberReferenceExpr(Owned(This->Retain()), 4939 This->getType(), 4940 Loc, /*IsArrow=*/true, 4941 SS, 0, MemberLookup, 0); 4942 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 4943 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 4944 4945 // If the field should be copied with __builtin_memcpy rather than via 4946 // explicit assignments, do so. This optimization only applies for arrays 4947 // of scalars and arrays of class type with trivial copy-assignment 4948 // operators. 4949 if (FieldType->isArrayType() && 4950 (!BaseType->isRecordType() || 4951 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 4952 ->hasTrivialCopyAssignment())) { 4953 // Compute the size of the memory buffer to be copied. 4954 QualType SizeType = Context.getSizeType(); 4955 llvm::APInt Size(Context.getTypeSize(SizeType), 4956 Context.getTypeSizeInChars(BaseType).getQuantity()); 4957 for (const ConstantArrayType *Array 4958 = Context.getAsConstantArrayType(FieldType); 4959 Array; 4960 Array = Context.getAsConstantArrayType(Array->getElementType())) { 4961 llvm::APInt ArraySize = Array->getSize(); 4962 ArraySize.zextOrTrunc(Size.getBitWidth()); 4963 Size *= ArraySize; 4964 } 4965 4966 // Take the address of the field references for "from" and "to". 4967 From = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(From)); 4968 To = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(To)); 4969 4970 bool NeedsCollectableMemCpy = 4971 (BaseType->isRecordType() && 4972 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 4973 4974 if (NeedsCollectableMemCpy) { 4975 if (!CollectableMemCpyRef) { 4976 // Create a reference to the __builtin_objc_memmove_collectable function. 4977 LookupResult R(*this, 4978 &Context.Idents.get("__builtin_objc_memmove_collectable"), 4979 Loc, LookupOrdinaryName); 4980 LookupName(R, TUScope, true); 4981 4982 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 4983 if (!CollectableMemCpy) { 4984 // Something went horribly wrong earlier, and we will have 4985 // complained about it. 4986 Invalid = true; 4987 continue; 4988 } 4989 4990 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 4991 CollectableMemCpy->getType(), 4992 Loc, 0).takeAs<Expr>(); 4993 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 4994 } 4995 } 4996 // Create a reference to the __builtin_memcpy builtin function. 4997 else if (!BuiltinMemCpyRef) { 4998 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 4999 LookupOrdinaryName); 5000 LookupName(R, TUScope, true); 5001 5002 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5003 if (!BuiltinMemCpy) { 5004 // Something went horribly wrong earlier, and we will have complained 5005 // about it. 5006 Invalid = true; 5007 continue; 5008 } 5009 5010 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5011 BuiltinMemCpy->getType(), 5012 Loc, 0).takeAs<Expr>(); 5013 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5014 } 5015 5016 ASTOwningVector<&ActionBase::DeleteExpr> CallArgs(*this); 5017 CallArgs.push_back(To.takeAs<Expr>()); 5018 CallArgs.push_back(From.takeAs<Expr>()); 5019 CallArgs.push_back(new (Context) IntegerLiteral(Size, SizeType, Loc)); 5020 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 5021 Commas.push_back(Loc); 5022 Commas.push_back(Loc); 5023 OwningExprResult Call = ExprError(); 5024 if (NeedsCollectableMemCpy) 5025 Call = ActOnCallExpr(/*Scope=*/0, 5026 Owned(CollectableMemCpyRef->Retain()), 5027 Loc, move_arg(CallArgs), 5028 Commas.data(), Loc); 5029 else 5030 Call = ActOnCallExpr(/*Scope=*/0, 5031 Owned(BuiltinMemCpyRef->Retain()), 5032 Loc, move_arg(CallArgs), 5033 Commas.data(), Loc); 5034 5035 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5036 Statements.push_back(Call.takeAs<Expr>()); 5037 continue; 5038 } 5039 5040 // Build the copy of this field. 5041 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5042 move(To), move(From), 5043 /*CopyingBaseSubobject=*/false); 5044 if (Copy.isInvalid()) { 5045 Diag(CurrentLocation, diag::note_member_synthesized_at) 5046 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5047 CopyAssignOperator->setInvalidDecl(); 5048 return; 5049 } 5050 5051 // Success! Record the copy. 5052 Statements.push_back(Copy.takeAs<Stmt>()); 5053 } 5054 5055 if (!Invalid) { 5056 // Add a "return *this;" 5057 OwningExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 5058 Owned(This->Retain())); 5059 5060 OwningStmtResult Return = ActOnReturnStmt(Loc, move(ThisObj)); 5061 if (Return.isInvalid()) 5062 Invalid = true; 5063 else { 5064 Statements.push_back(Return.takeAs<Stmt>()); 5065 5066 if (Trap.hasErrorOccurred()) { 5067 Diag(CurrentLocation, diag::note_member_synthesized_at) 5068 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5069 Invalid = true; 5070 } 5071 } 5072 } 5073 5074 if (Invalid) { 5075 CopyAssignOperator->setInvalidDecl(); 5076 return; 5077 } 5078 5079 OwningStmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5080 /*isStmtExpr=*/false); 5081 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5082 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5083} 5084 5085CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5086 CXXRecordDecl *ClassDecl) { 5087 // C++ [class.copy]p4: 5088 // If the class definition does not explicitly declare a copy 5089 // constructor, one is declared implicitly. 5090 5091 // C++ [class.copy]p5: 5092 // The implicitly-declared copy constructor for a class X will 5093 // have the form 5094 // 5095 // X::X(const X&) 5096 // 5097 // if 5098 bool HasConstCopyConstructor = true; 5099 5100 // -- each direct or virtual base class B of X has a copy 5101 // constructor whose first parameter is of type const B& or 5102 // const volatile B&, and 5103 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5104 BaseEnd = ClassDecl->bases_end(); 5105 HasConstCopyConstructor && Base != BaseEnd; 5106 ++Base) { 5107 // Virtual bases are handled below. 5108 if (Base->isVirtual()) 5109 continue; 5110 5111 CXXRecordDecl *BaseClassDecl 5112 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5113 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5114 DeclareImplicitCopyConstructor(BaseClassDecl); 5115 5116 HasConstCopyConstructor 5117 = BaseClassDecl->hasConstCopyConstructor(Context); 5118 } 5119 5120 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5121 BaseEnd = ClassDecl->vbases_end(); 5122 HasConstCopyConstructor && Base != BaseEnd; 5123 ++Base) { 5124 CXXRecordDecl *BaseClassDecl 5125 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5126 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5127 DeclareImplicitCopyConstructor(BaseClassDecl); 5128 5129 HasConstCopyConstructor 5130 = BaseClassDecl->hasConstCopyConstructor(Context); 5131 } 5132 5133 // -- for all the nonstatic data members of X that are of a 5134 // class type M (or array thereof), each such class type 5135 // has a copy constructor whose first parameter is of type 5136 // const M& or const volatile M&. 5137 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5138 FieldEnd = ClassDecl->field_end(); 5139 HasConstCopyConstructor && Field != FieldEnd; 5140 ++Field) { 5141 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5142 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5143 CXXRecordDecl *FieldClassDecl 5144 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5145 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5146 DeclareImplicitCopyConstructor(FieldClassDecl); 5147 5148 HasConstCopyConstructor 5149 = FieldClassDecl->hasConstCopyConstructor(Context); 5150 } 5151 } 5152 5153 // Otherwise, the implicitly declared copy constructor will have 5154 // the form 5155 // 5156 // X::X(X&) 5157 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5158 QualType ArgType = ClassType; 5159 if (HasConstCopyConstructor) 5160 ArgType = ArgType.withConst(); 5161 ArgType = Context.getLValueReferenceType(ArgType); 5162 5163 // C++ [except.spec]p14: 5164 // An implicitly declared special member function (Clause 12) shall have an 5165 // exception-specification. [...] 5166 ImplicitExceptionSpecification ExceptSpec(Context); 5167 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5168 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5169 BaseEnd = ClassDecl->bases_end(); 5170 Base != BaseEnd; 5171 ++Base) { 5172 // Virtual bases are handled below. 5173 if (Base->isVirtual()) 5174 continue; 5175 5176 CXXRecordDecl *BaseClassDecl 5177 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5178 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5179 DeclareImplicitCopyConstructor(BaseClassDecl); 5180 5181 if (CXXConstructorDecl *CopyConstructor 5182 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5183 ExceptSpec.CalledDecl(CopyConstructor); 5184 } 5185 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5186 BaseEnd = ClassDecl->vbases_end(); 5187 Base != BaseEnd; 5188 ++Base) { 5189 CXXRecordDecl *BaseClassDecl 5190 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5191 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5192 DeclareImplicitCopyConstructor(BaseClassDecl); 5193 5194 if (CXXConstructorDecl *CopyConstructor 5195 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5196 ExceptSpec.CalledDecl(CopyConstructor); 5197 } 5198 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5199 FieldEnd = ClassDecl->field_end(); 5200 Field != FieldEnd; 5201 ++Field) { 5202 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5203 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5204 CXXRecordDecl *FieldClassDecl 5205 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5206 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5207 DeclareImplicitCopyConstructor(FieldClassDecl); 5208 5209 if (CXXConstructorDecl *CopyConstructor 5210 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5211 ExceptSpec.CalledDecl(CopyConstructor); 5212 } 5213 } 5214 5215 // An implicitly-declared copy constructor is an inline public 5216 // member of its class. 5217 DeclarationName Name 5218 = Context.DeclarationNames.getCXXConstructorName( 5219 Context.getCanonicalType(ClassType)); 5220 CXXConstructorDecl *CopyConstructor 5221 = CXXConstructorDecl::Create(Context, ClassDecl, 5222 ClassDecl->getLocation(), Name, 5223 Context.getFunctionType(Context.VoidTy, 5224 &ArgType, 1, 5225 false, 0, 5226 ExceptSpec.hasExceptionSpecification(), 5227 ExceptSpec.hasAnyExceptionSpecification(), 5228 ExceptSpec.size(), 5229 ExceptSpec.data(), 5230 FunctionType::ExtInfo()), 5231 /*TInfo=*/0, 5232 /*isExplicit=*/false, 5233 /*isInline=*/true, 5234 /*isImplicitlyDeclared=*/true); 5235 CopyConstructor->setAccess(AS_public); 5236 CopyConstructor->setImplicit(); 5237 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5238 5239 // Note that we have declared this constructor. 5240 ClassDecl->setDeclaredCopyConstructor(true); 5241 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5242 5243 // Add the parameter to the constructor. 5244 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5245 ClassDecl->getLocation(), 5246 /*IdentifierInfo=*/0, 5247 ArgType, /*TInfo=*/0, 5248 VarDecl::None, 5249 VarDecl::None, 0); 5250 CopyConstructor->setParams(&FromParam, 1); 5251 if (Scope *S = getScopeForContext(ClassDecl)) 5252 PushOnScopeChains(CopyConstructor, S, false); 5253 ClassDecl->addDecl(CopyConstructor); 5254 5255 return CopyConstructor; 5256} 5257 5258void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5259 CXXConstructorDecl *CopyConstructor, 5260 unsigned TypeQuals) { 5261 assert((CopyConstructor->isImplicit() && 5262 CopyConstructor->isCopyConstructor(TypeQuals) && 5263 !CopyConstructor->isUsed(false)) && 5264 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5265 5266 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5267 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5268 5269 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5270 ErrorTrap Trap(*this); 5271 5272 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5273 Trap.hasErrorOccurred()) { 5274 Diag(CurrentLocation, diag::note_member_synthesized_at) 5275 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5276 CopyConstructor->setInvalidDecl(); 5277 } else { 5278 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5279 CopyConstructor->getLocation(), 5280 MultiStmtArg(*this, 0, 0), 5281 /*isStmtExpr=*/false) 5282 .takeAs<Stmt>()); 5283 } 5284 5285 CopyConstructor->setUsed(); 5286} 5287 5288Sema::OwningExprResult 5289Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5290 CXXConstructorDecl *Constructor, 5291 MultiExprArg ExprArgs, 5292 bool RequiresZeroInit, 5293 CXXConstructExpr::ConstructionKind ConstructKind) { 5294 bool Elidable = false; 5295 5296 // C++0x [class.copy]p34: 5297 // When certain criteria are met, an implementation is allowed to 5298 // omit the copy/move construction of a class object, even if the 5299 // copy/move constructor and/or destructor for the object have 5300 // side effects. [...] 5301 // - when a temporary class object that has not been bound to a 5302 // reference (12.2) would be copied/moved to a class object 5303 // with the same cv-unqualified type, the copy/move operation 5304 // can be omitted by constructing the temporary object 5305 // directly into the target of the omitted copy/move 5306 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5307 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5308 Elidable = SubExpr->isTemporaryObject() && 5309 Context.hasSameUnqualifiedType(SubExpr->getType(), 5310 Context.getTypeDeclType(Constructor->getParent())); 5311 } 5312 5313 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5314 Elidable, move(ExprArgs), RequiresZeroInit, 5315 ConstructKind); 5316} 5317 5318/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5319/// including handling of its default argument expressions. 5320Sema::OwningExprResult 5321Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5322 CXXConstructorDecl *Constructor, bool Elidable, 5323 MultiExprArg ExprArgs, 5324 bool RequiresZeroInit, 5325 CXXConstructExpr::ConstructionKind ConstructKind) { 5326 unsigned NumExprs = ExprArgs.size(); 5327 Expr **Exprs = (Expr **)ExprArgs.release(); 5328 5329 MarkDeclarationReferenced(ConstructLoc, Constructor); 5330 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5331 Constructor, Elidable, Exprs, NumExprs, 5332 RequiresZeroInit, ConstructKind)); 5333} 5334 5335bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5336 CXXConstructorDecl *Constructor, 5337 MultiExprArg Exprs) { 5338 OwningExprResult TempResult = 5339 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5340 move(Exprs)); 5341 if (TempResult.isInvalid()) 5342 return true; 5343 5344 Expr *Temp = TempResult.takeAs<Expr>(); 5345 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5346 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 5347 VD->setInit(Temp); 5348 5349 return false; 5350} 5351 5352void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5353 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5354 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5355 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5356 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5357 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5358 CheckDestructorAccess(VD->getLocation(), Destructor, 5359 PDiag(diag::err_access_dtor_var) 5360 << VD->getDeclName() 5361 << VD->getType()); 5362 } 5363} 5364 5365/// AddCXXDirectInitializerToDecl - This action is called immediately after 5366/// ActOnDeclarator, when a C++ direct initializer is present. 5367/// e.g: "int x(1);" 5368void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 5369 SourceLocation LParenLoc, 5370 MultiExprArg Exprs, 5371 SourceLocation *CommaLocs, 5372 SourceLocation RParenLoc) { 5373 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5374 Decl *RealDecl = Dcl.getAs<Decl>(); 5375 5376 // If there is no declaration, there was an error parsing it. Just ignore 5377 // the initializer. 5378 if (RealDecl == 0) 5379 return; 5380 5381 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5382 if (!VDecl) { 5383 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5384 RealDecl->setInvalidDecl(); 5385 return; 5386 } 5387 5388 // We will represent direct-initialization similarly to copy-initialization: 5389 // int x(1); -as-> int x = 1; 5390 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5391 // 5392 // Clients that want to distinguish between the two forms, can check for 5393 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5394 // A major benefit is that clients that don't particularly care about which 5395 // exactly form was it (like the CodeGen) can handle both cases without 5396 // special case code. 5397 5398 // C++ 8.5p11: 5399 // The form of initialization (using parentheses or '=') is generally 5400 // insignificant, but does matter when the entity being initialized has a 5401 // class type. 5402 QualType DeclInitType = VDecl->getType(); 5403 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 5404 DeclInitType = Context.getBaseElementType(Array); 5405 5406 if (!VDecl->getType()->isDependentType() && 5407 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5408 diag::err_typecheck_decl_incomplete_type)) { 5409 VDecl->setInvalidDecl(); 5410 return; 5411 } 5412 5413 // The variable can not have an abstract class type. 5414 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5415 diag::err_abstract_type_in_decl, 5416 AbstractVariableType)) 5417 VDecl->setInvalidDecl(); 5418 5419 const VarDecl *Def; 5420 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5421 Diag(VDecl->getLocation(), diag::err_redefinition) 5422 << VDecl->getDeclName(); 5423 Diag(Def->getLocation(), diag::note_previous_definition); 5424 VDecl->setInvalidDecl(); 5425 return; 5426 } 5427 5428 // If either the declaration has a dependent type or if any of the 5429 // expressions is type-dependent, we represent the initialization 5430 // via a ParenListExpr for later use during template instantiation. 5431 if (VDecl->getType()->isDependentType() || 5432 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5433 // Let clients know that initialization was done with a direct initializer. 5434 VDecl->setCXXDirectInitializer(true); 5435 5436 // Store the initialization expressions as a ParenListExpr. 5437 unsigned NumExprs = Exprs.size(); 5438 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5439 (Expr **)Exprs.release(), 5440 NumExprs, RParenLoc)); 5441 return; 5442 } 5443 5444 // Capture the variable that is being initialized and the style of 5445 // initialization. 5446 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5447 5448 // FIXME: Poor source location information. 5449 InitializationKind Kind 5450 = InitializationKind::CreateDirect(VDecl->getLocation(), 5451 LParenLoc, RParenLoc); 5452 5453 InitializationSequence InitSeq(*this, Entity, Kind, 5454 (Expr**)Exprs.get(), Exprs.size()); 5455 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5456 if (Result.isInvalid()) { 5457 VDecl->setInvalidDecl(); 5458 return; 5459 } 5460 5461 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 5462 VDecl->setInit(Result.takeAs<Expr>()); 5463 VDecl->setCXXDirectInitializer(true); 5464 5465 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5466 FinalizeVarWithDestructor(VDecl, Record); 5467} 5468 5469/// \brief Given a constructor and the set of arguments provided for the 5470/// constructor, convert the arguments and add any required default arguments 5471/// to form a proper call to this constructor. 5472/// 5473/// \returns true if an error occurred, false otherwise. 5474bool 5475Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5476 MultiExprArg ArgsPtr, 5477 SourceLocation Loc, 5478 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 5479 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5480 unsigned NumArgs = ArgsPtr.size(); 5481 Expr **Args = (Expr **)ArgsPtr.get(); 5482 5483 const FunctionProtoType *Proto 5484 = Constructor->getType()->getAs<FunctionProtoType>(); 5485 assert(Proto && "Constructor without a prototype?"); 5486 unsigned NumArgsInProto = Proto->getNumArgs(); 5487 5488 // If too few arguments are available, we'll fill in the rest with defaults. 5489 if (NumArgs < NumArgsInProto) 5490 ConvertedArgs.reserve(NumArgsInProto); 5491 else 5492 ConvertedArgs.reserve(NumArgs); 5493 5494 VariadicCallType CallType = 5495 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5496 llvm::SmallVector<Expr *, 8> AllArgs; 5497 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5498 Proto, 0, Args, NumArgs, AllArgs, 5499 CallType); 5500 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5501 ConvertedArgs.push_back(AllArgs[i]); 5502 return Invalid; 5503} 5504 5505static inline bool 5506CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5507 const FunctionDecl *FnDecl) { 5508 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 5509 if (isa<NamespaceDecl>(DC)) { 5510 return SemaRef.Diag(FnDecl->getLocation(), 5511 diag::err_operator_new_delete_declared_in_namespace) 5512 << FnDecl->getDeclName(); 5513 } 5514 5515 if (isa<TranslationUnitDecl>(DC) && 5516 FnDecl->getStorageClass() == FunctionDecl::Static) { 5517 return SemaRef.Diag(FnDecl->getLocation(), 5518 diag::err_operator_new_delete_declared_static) 5519 << FnDecl->getDeclName(); 5520 } 5521 5522 return false; 5523} 5524 5525static inline bool 5526CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5527 CanQualType ExpectedResultType, 5528 CanQualType ExpectedFirstParamType, 5529 unsigned DependentParamTypeDiag, 5530 unsigned InvalidParamTypeDiag) { 5531 QualType ResultType = 5532 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5533 5534 // Check that the result type is not dependent. 5535 if (ResultType->isDependentType()) 5536 return SemaRef.Diag(FnDecl->getLocation(), 5537 diag::err_operator_new_delete_dependent_result_type) 5538 << FnDecl->getDeclName() << ExpectedResultType; 5539 5540 // Check that the result type is what we expect. 5541 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5542 return SemaRef.Diag(FnDecl->getLocation(), 5543 diag::err_operator_new_delete_invalid_result_type) 5544 << FnDecl->getDeclName() << ExpectedResultType; 5545 5546 // A function template must have at least 2 parameters. 5547 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5548 return SemaRef.Diag(FnDecl->getLocation(), 5549 diag::err_operator_new_delete_template_too_few_parameters) 5550 << FnDecl->getDeclName(); 5551 5552 // The function decl must have at least 1 parameter. 5553 if (FnDecl->getNumParams() == 0) 5554 return SemaRef.Diag(FnDecl->getLocation(), 5555 diag::err_operator_new_delete_too_few_parameters) 5556 << FnDecl->getDeclName(); 5557 5558 // Check the the first parameter type is not dependent. 5559 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5560 if (FirstParamType->isDependentType()) 5561 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5562 << FnDecl->getDeclName() << ExpectedFirstParamType; 5563 5564 // Check that the first parameter type is what we expect. 5565 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5566 ExpectedFirstParamType) 5567 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5568 << FnDecl->getDeclName() << ExpectedFirstParamType; 5569 5570 return false; 5571} 5572 5573static bool 5574CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5575 // C++ [basic.stc.dynamic.allocation]p1: 5576 // A program is ill-formed if an allocation function is declared in a 5577 // namespace scope other than global scope or declared static in global 5578 // scope. 5579 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5580 return true; 5581 5582 CanQualType SizeTy = 5583 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5584 5585 // C++ [basic.stc.dynamic.allocation]p1: 5586 // The return type shall be void*. The first parameter shall have type 5587 // std::size_t. 5588 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5589 SizeTy, 5590 diag::err_operator_new_dependent_param_type, 5591 diag::err_operator_new_param_type)) 5592 return true; 5593 5594 // C++ [basic.stc.dynamic.allocation]p1: 5595 // The first parameter shall not have an associated default argument. 5596 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5597 return SemaRef.Diag(FnDecl->getLocation(), 5598 diag::err_operator_new_default_arg) 5599 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5600 5601 return false; 5602} 5603 5604static bool 5605CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5606 // C++ [basic.stc.dynamic.deallocation]p1: 5607 // A program is ill-formed if deallocation functions are declared in a 5608 // namespace scope other than global scope or declared static in global 5609 // scope. 5610 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5611 return true; 5612 5613 // C++ [basic.stc.dynamic.deallocation]p2: 5614 // Each deallocation function shall return void and its first parameter 5615 // shall be void*. 5616 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5617 SemaRef.Context.VoidPtrTy, 5618 diag::err_operator_delete_dependent_param_type, 5619 diag::err_operator_delete_param_type)) 5620 return true; 5621 5622 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5623 if (FirstParamType->isDependentType()) 5624 return SemaRef.Diag(FnDecl->getLocation(), 5625 diag::err_operator_delete_dependent_param_type) 5626 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5627 5628 if (SemaRef.Context.getCanonicalType(FirstParamType) != 5629 SemaRef.Context.VoidPtrTy) 5630 return SemaRef.Diag(FnDecl->getLocation(), 5631 diag::err_operator_delete_param_type) 5632 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5633 5634 return false; 5635} 5636 5637/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5638/// of this overloaded operator is well-formed. If so, returns false; 5639/// otherwise, emits appropriate diagnostics and returns true. 5640bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5641 assert(FnDecl && FnDecl->isOverloadedOperator() && 5642 "Expected an overloaded operator declaration"); 5643 5644 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5645 5646 // C++ [over.oper]p5: 5647 // The allocation and deallocation functions, operator new, 5648 // operator new[], operator delete and operator delete[], are 5649 // described completely in 3.7.3. The attributes and restrictions 5650 // found in the rest of this subclause do not apply to them unless 5651 // explicitly stated in 3.7.3. 5652 if (Op == OO_Delete || Op == OO_Array_Delete) 5653 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5654 5655 if (Op == OO_New || Op == OO_Array_New) 5656 return CheckOperatorNewDeclaration(*this, FnDecl); 5657 5658 // C++ [over.oper]p6: 5659 // An operator function shall either be a non-static member 5660 // function or be a non-member function and have at least one 5661 // parameter whose type is a class, a reference to a class, an 5662 // enumeration, or a reference to an enumeration. 5663 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5664 if (MethodDecl->isStatic()) 5665 return Diag(FnDecl->getLocation(), 5666 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5667 } else { 5668 bool ClassOrEnumParam = false; 5669 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5670 ParamEnd = FnDecl->param_end(); 5671 Param != ParamEnd; ++Param) { 5672 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5673 if (ParamType->isDependentType() || ParamType->isRecordType() || 5674 ParamType->isEnumeralType()) { 5675 ClassOrEnumParam = true; 5676 break; 5677 } 5678 } 5679 5680 if (!ClassOrEnumParam) 5681 return Diag(FnDecl->getLocation(), 5682 diag::err_operator_overload_needs_class_or_enum) 5683 << FnDecl->getDeclName(); 5684 } 5685 5686 // C++ [over.oper]p8: 5687 // An operator function cannot have default arguments (8.3.6), 5688 // except where explicitly stated below. 5689 // 5690 // Only the function-call operator allows default arguments 5691 // (C++ [over.call]p1). 5692 if (Op != OO_Call) { 5693 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5694 Param != FnDecl->param_end(); ++Param) { 5695 if ((*Param)->hasDefaultArg()) 5696 return Diag((*Param)->getLocation(), 5697 diag::err_operator_overload_default_arg) 5698 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5699 } 5700 } 5701 5702 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5703 { false, false, false } 5704#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5705 , { Unary, Binary, MemberOnly } 5706#include "clang/Basic/OperatorKinds.def" 5707 }; 5708 5709 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5710 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5711 bool MustBeMemberOperator = OperatorUses[Op][2]; 5712 5713 // C++ [over.oper]p8: 5714 // [...] Operator functions cannot have more or fewer parameters 5715 // than the number required for the corresponding operator, as 5716 // described in the rest of this subclause. 5717 unsigned NumParams = FnDecl->getNumParams() 5718 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5719 if (Op != OO_Call && 5720 ((NumParams == 1 && !CanBeUnaryOperator) || 5721 (NumParams == 2 && !CanBeBinaryOperator) || 5722 (NumParams < 1) || (NumParams > 2))) { 5723 // We have the wrong number of parameters. 5724 unsigned ErrorKind; 5725 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5726 ErrorKind = 2; // 2 -> unary or binary. 5727 } else if (CanBeUnaryOperator) { 5728 ErrorKind = 0; // 0 -> unary 5729 } else { 5730 assert(CanBeBinaryOperator && 5731 "All non-call overloaded operators are unary or binary!"); 5732 ErrorKind = 1; // 1 -> binary 5733 } 5734 5735 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5736 << FnDecl->getDeclName() << NumParams << ErrorKind; 5737 } 5738 5739 // Overloaded operators other than operator() cannot be variadic. 5740 if (Op != OO_Call && 5741 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5742 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5743 << FnDecl->getDeclName(); 5744 } 5745 5746 // Some operators must be non-static member functions. 5747 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5748 return Diag(FnDecl->getLocation(), 5749 diag::err_operator_overload_must_be_member) 5750 << FnDecl->getDeclName(); 5751 } 5752 5753 // C++ [over.inc]p1: 5754 // The user-defined function called operator++ implements the 5755 // prefix and postfix ++ operator. If this function is a member 5756 // function with no parameters, or a non-member function with one 5757 // parameter of class or enumeration type, it defines the prefix 5758 // increment operator ++ for objects of that type. If the function 5759 // is a member function with one parameter (which shall be of type 5760 // int) or a non-member function with two parameters (the second 5761 // of which shall be of type int), it defines the postfix 5762 // increment operator ++ for objects of that type. 5763 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5764 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5765 bool ParamIsInt = false; 5766 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5767 ParamIsInt = BT->getKind() == BuiltinType::Int; 5768 5769 if (!ParamIsInt) 5770 return Diag(LastParam->getLocation(), 5771 diag::err_operator_overload_post_incdec_must_be_int) 5772 << LastParam->getType() << (Op == OO_MinusMinus); 5773 } 5774 5775 // Notify the class if it got an assignment operator. 5776 if (Op == OO_Equal) { 5777 // Would have returned earlier otherwise. 5778 assert(isa<CXXMethodDecl>(FnDecl) && 5779 "Overloaded = not member, but not filtered."); 5780 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5781 Method->getParent()->addedAssignmentOperator(Context, Method); 5782 } 5783 5784 return false; 5785} 5786 5787/// CheckLiteralOperatorDeclaration - Check whether the declaration 5788/// of this literal operator function is well-formed. If so, returns 5789/// false; otherwise, emits appropriate diagnostics and returns true. 5790bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5791 DeclContext *DC = FnDecl->getDeclContext(); 5792 Decl::Kind Kind = DC->getDeclKind(); 5793 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5794 Kind != Decl::LinkageSpec) { 5795 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5796 << FnDecl->getDeclName(); 5797 return true; 5798 } 5799 5800 bool Valid = false; 5801 5802 // template <char...> type operator "" name() is the only valid template 5803 // signature, and the only valid signature with no parameters. 5804 if (FnDecl->param_size() == 0) { 5805 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5806 // Must have only one template parameter 5807 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5808 if (Params->size() == 1) { 5809 NonTypeTemplateParmDecl *PmDecl = 5810 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5811 5812 // The template parameter must be a char parameter pack. 5813 // FIXME: This test will always fail because non-type parameter packs 5814 // have not been implemented. 5815 if (PmDecl && PmDecl->isTemplateParameterPack() && 5816 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5817 Valid = true; 5818 } 5819 } 5820 } else { 5821 // Check the first parameter 5822 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5823 5824 QualType T = (*Param)->getType(); 5825 5826 // unsigned long long int, long double, and any character type are allowed 5827 // as the only parameters. 5828 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5829 Context.hasSameType(T, Context.LongDoubleTy) || 5830 Context.hasSameType(T, Context.CharTy) || 5831 Context.hasSameType(T, Context.WCharTy) || 5832 Context.hasSameType(T, Context.Char16Ty) || 5833 Context.hasSameType(T, Context.Char32Ty)) { 5834 if (++Param == FnDecl->param_end()) 5835 Valid = true; 5836 goto FinishedParams; 5837 } 5838 5839 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5840 const PointerType *PT = T->getAs<PointerType>(); 5841 if (!PT) 5842 goto FinishedParams; 5843 T = PT->getPointeeType(); 5844 if (!T.isConstQualified()) 5845 goto FinishedParams; 5846 T = T.getUnqualifiedType(); 5847 5848 // Move on to the second parameter; 5849 ++Param; 5850 5851 // If there is no second parameter, the first must be a const char * 5852 if (Param == FnDecl->param_end()) { 5853 if (Context.hasSameType(T, Context.CharTy)) 5854 Valid = true; 5855 goto FinishedParams; 5856 } 5857 5858 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5859 // are allowed as the first parameter to a two-parameter function 5860 if (!(Context.hasSameType(T, Context.CharTy) || 5861 Context.hasSameType(T, Context.WCharTy) || 5862 Context.hasSameType(T, Context.Char16Ty) || 5863 Context.hasSameType(T, Context.Char32Ty))) 5864 goto FinishedParams; 5865 5866 // The second and final parameter must be an std::size_t 5867 T = (*Param)->getType().getUnqualifiedType(); 5868 if (Context.hasSameType(T, Context.getSizeType()) && 5869 ++Param == FnDecl->param_end()) 5870 Valid = true; 5871 } 5872 5873 // FIXME: This diagnostic is absolutely terrible. 5874FinishedParams: 5875 if (!Valid) { 5876 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5877 << FnDecl->getDeclName(); 5878 return true; 5879 } 5880 5881 return false; 5882} 5883 5884/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5885/// linkage specification, including the language and (if present) 5886/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5887/// the location of the language string literal, which is provided 5888/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5889/// the '{' brace. Otherwise, this linkage specification does not 5890/// have any braces. 5891Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5892 SourceLocation ExternLoc, 5893 SourceLocation LangLoc, 5894 llvm::StringRef Lang, 5895 SourceLocation LBraceLoc) { 5896 LinkageSpecDecl::LanguageIDs Language; 5897 if (Lang == "\"C\"") 5898 Language = LinkageSpecDecl::lang_c; 5899 else if (Lang == "\"C++\"") 5900 Language = LinkageSpecDecl::lang_cxx; 5901 else { 5902 Diag(LangLoc, diag::err_bad_language); 5903 return DeclPtrTy(); 5904 } 5905 5906 // FIXME: Add all the various semantics of linkage specifications 5907 5908 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5909 LangLoc, Language, 5910 LBraceLoc.isValid()); 5911 CurContext->addDecl(D); 5912 PushDeclContext(S, D); 5913 return DeclPtrTy::make(D); 5914} 5915 5916/// ActOnFinishLinkageSpecification - Completely the definition of 5917/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5918/// valid, it's the position of the closing '}' brace in a linkage 5919/// specification that uses braces. 5920Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5921 DeclPtrTy LinkageSpec, 5922 SourceLocation RBraceLoc) { 5923 if (LinkageSpec) 5924 PopDeclContext(); 5925 return LinkageSpec; 5926} 5927 5928/// \brief Perform semantic analysis for the variable declaration that 5929/// occurs within a C++ catch clause, returning the newly-created 5930/// variable. 5931VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5932 TypeSourceInfo *TInfo, 5933 IdentifierInfo *Name, 5934 SourceLocation Loc, 5935 SourceRange Range) { 5936 bool Invalid = false; 5937 5938 // Arrays and functions decay. 5939 if (ExDeclType->isArrayType()) 5940 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5941 else if (ExDeclType->isFunctionType()) 5942 ExDeclType = Context.getPointerType(ExDeclType); 5943 5944 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5945 // The exception-declaration shall not denote a pointer or reference to an 5946 // incomplete type, other than [cv] void*. 5947 // N2844 forbids rvalue references. 5948 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5949 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5950 Invalid = true; 5951 } 5952 5953 // GCC allows catching pointers and references to incomplete types 5954 // as an extension; so do we, but we warn by default. 5955 5956 QualType BaseType = ExDeclType; 5957 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5958 unsigned DK = diag::err_catch_incomplete; 5959 bool IncompleteCatchIsInvalid = true; 5960 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5961 BaseType = Ptr->getPointeeType(); 5962 Mode = 1; 5963 DK = diag::ext_catch_incomplete_ptr; 5964 IncompleteCatchIsInvalid = false; 5965 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5966 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5967 BaseType = Ref->getPointeeType(); 5968 Mode = 2; 5969 DK = diag::ext_catch_incomplete_ref; 5970 IncompleteCatchIsInvalid = false; 5971 } 5972 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5973 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5974 IncompleteCatchIsInvalid) 5975 Invalid = true; 5976 5977 if (!Invalid && !ExDeclType->isDependentType() && 5978 RequireNonAbstractType(Loc, ExDeclType, 5979 diag::err_abstract_type_in_decl, 5980 AbstractVariableType)) 5981 Invalid = true; 5982 5983 // Only the non-fragile NeXT runtime currently supports C++ catches 5984 // of ObjC types, and no runtime supports catching ObjC types by value. 5985 if (!Invalid && getLangOptions().ObjC1) { 5986 QualType T = ExDeclType; 5987 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 5988 T = RT->getPointeeType(); 5989 5990 if (T->isObjCObjectType()) { 5991 Diag(Loc, diag::err_objc_object_catch); 5992 Invalid = true; 5993 } else if (T->isObjCObjectPointerType()) { 5994 if (!getLangOptions().NeXTRuntime) { 5995 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 5996 Invalid = true; 5997 } else if (!getLangOptions().ObjCNonFragileABI) { 5998 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 5999 Invalid = true; 6000 } 6001 } 6002 } 6003 6004 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6005 Name, ExDeclType, TInfo, VarDecl::None, 6006 VarDecl::None); 6007 ExDecl->setExceptionVariable(true); 6008 6009 if (!Invalid) { 6010 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6011 // C++ [except.handle]p16: 6012 // The object declared in an exception-declaration or, if the 6013 // exception-declaration does not specify a name, a temporary (12.2) is 6014 // copy-initialized (8.5) from the exception object. [...] 6015 // The object is destroyed when the handler exits, after the destruction 6016 // of any automatic objects initialized within the handler. 6017 // 6018 // We just pretend to initialize the object with itself, then make sure 6019 // it can be destroyed later. 6020 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6021 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6022 Loc, ExDeclType, 0); 6023 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6024 SourceLocation()); 6025 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6026 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6027 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 6028 if (Result.isInvalid()) 6029 Invalid = true; 6030 else 6031 FinalizeVarWithDestructor(ExDecl, RecordTy); 6032 } 6033 } 6034 6035 if (Invalid) 6036 ExDecl->setInvalidDecl(); 6037 6038 return ExDecl; 6039} 6040 6041/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6042/// handler. 6043Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6044 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6045 QualType ExDeclType = TInfo->getType(); 6046 6047 bool Invalid = D.isInvalidType(); 6048 IdentifierInfo *II = D.getIdentifier(); 6049 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6050 LookupOrdinaryName, 6051 ForRedeclaration)) { 6052 // The scope should be freshly made just for us. There is just no way 6053 // it contains any previous declaration. 6054 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 6055 if (PrevDecl->isTemplateParameter()) { 6056 // Maybe we will complain about the shadowed template parameter. 6057 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6058 } 6059 } 6060 6061 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6062 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6063 << D.getCXXScopeSpec().getRange(); 6064 Invalid = true; 6065 } 6066 6067 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 6068 D.getIdentifier(), 6069 D.getIdentifierLoc(), 6070 D.getDeclSpec().getSourceRange()); 6071 6072 if (Invalid) 6073 ExDecl->setInvalidDecl(); 6074 6075 // Add the exception declaration into this scope. 6076 if (II) 6077 PushOnScopeChains(ExDecl, S); 6078 else 6079 CurContext->addDecl(ExDecl); 6080 6081 ProcessDeclAttributes(S, ExDecl, D); 6082 return DeclPtrTy::make(ExDecl); 6083} 6084 6085Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6086 ExprArg assertexpr, 6087 ExprArg assertmessageexpr) { 6088 Expr *AssertExpr = (Expr *)assertexpr.get(); 6089 StringLiteral *AssertMessage = 6090 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 6091 6092 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6093 llvm::APSInt Value(32); 6094 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6095 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6096 AssertExpr->getSourceRange(); 6097 return DeclPtrTy(); 6098 } 6099 6100 if (Value == 0) { 6101 Diag(AssertLoc, diag::err_static_assert_failed) 6102 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6103 } 6104 } 6105 6106 assertexpr.release(); 6107 assertmessageexpr.release(); 6108 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6109 AssertExpr, AssertMessage); 6110 6111 CurContext->addDecl(Decl); 6112 return DeclPtrTy::make(Decl); 6113} 6114 6115/// \brief Perform semantic analysis of the given friend type declaration. 6116/// 6117/// \returns A friend declaration that. 6118FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6119 TypeSourceInfo *TSInfo) { 6120 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6121 6122 QualType T = TSInfo->getType(); 6123 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6124 6125 if (!getLangOptions().CPlusPlus0x) { 6126 // C++03 [class.friend]p2: 6127 // An elaborated-type-specifier shall be used in a friend declaration 6128 // for a class.* 6129 // 6130 // * The class-key of the elaborated-type-specifier is required. 6131 if (!ActiveTemplateInstantiations.empty()) { 6132 // Do not complain about the form of friend template types during 6133 // template instantiation; we will already have complained when the 6134 // template was declared. 6135 } else if (!T->isElaboratedTypeSpecifier()) { 6136 // If we evaluated the type to a record type, suggest putting 6137 // a tag in front. 6138 if (const RecordType *RT = T->getAs<RecordType>()) { 6139 RecordDecl *RD = RT->getDecl(); 6140 6141 std::string InsertionText = std::string(" ") + RD->getKindName(); 6142 6143 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6144 << (unsigned) RD->getTagKind() 6145 << T 6146 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6147 InsertionText); 6148 } else { 6149 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6150 << T 6151 << SourceRange(FriendLoc, TypeRange.getEnd()); 6152 } 6153 } else if (T->getAs<EnumType>()) { 6154 Diag(FriendLoc, diag::ext_enum_friend) 6155 << T 6156 << SourceRange(FriendLoc, TypeRange.getEnd()); 6157 } 6158 } 6159 6160 // C++0x [class.friend]p3: 6161 // If the type specifier in a friend declaration designates a (possibly 6162 // cv-qualified) class type, that class is declared as a friend; otherwise, 6163 // the friend declaration is ignored. 6164 6165 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6166 // in [class.friend]p3 that we do not implement. 6167 6168 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6169} 6170 6171/// Handle a friend type declaration. This works in tandem with 6172/// ActOnTag. 6173/// 6174/// Notes on friend class templates: 6175/// 6176/// We generally treat friend class declarations as if they were 6177/// declaring a class. So, for example, the elaborated type specifier 6178/// in a friend declaration is required to obey the restrictions of a 6179/// class-head (i.e. no typedefs in the scope chain), template 6180/// parameters are required to match up with simple template-ids, &c. 6181/// However, unlike when declaring a template specialization, it's 6182/// okay to refer to a template specialization without an empty 6183/// template parameter declaration, e.g. 6184/// friend class A<T>::B<unsigned>; 6185/// We permit this as a special case; if there are any template 6186/// parameters present at all, require proper matching, i.e. 6187/// template <> template <class T> friend class A<int>::B; 6188Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6189 MultiTemplateParamsArg TempParams) { 6190 SourceLocation Loc = DS.getSourceRange().getBegin(); 6191 6192 assert(DS.isFriendSpecified()); 6193 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6194 6195 // Try to convert the decl specifier to a type. This works for 6196 // friend templates because ActOnTag never produces a ClassTemplateDecl 6197 // for a TUK_Friend. 6198 Declarator TheDeclarator(DS, Declarator::MemberContext); 6199 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6200 QualType T = TSI->getType(); 6201 if (TheDeclarator.isInvalidType()) 6202 return DeclPtrTy(); 6203 6204 // This is definitely an error in C++98. It's probably meant to 6205 // be forbidden in C++0x, too, but the specification is just 6206 // poorly written. 6207 // 6208 // The problem is with declarations like the following: 6209 // template <T> friend A<T>::foo; 6210 // where deciding whether a class C is a friend or not now hinges 6211 // on whether there exists an instantiation of A that causes 6212 // 'foo' to equal C. There are restrictions on class-heads 6213 // (which we declare (by fiat) elaborated friend declarations to 6214 // be) that makes this tractable. 6215 // 6216 // FIXME: handle "template <> friend class A<T>;", which 6217 // is possibly well-formed? Who even knows? 6218 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6219 Diag(Loc, diag::err_tagless_friend_type_template) 6220 << DS.getSourceRange(); 6221 return DeclPtrTy(); 6222 } 6223 6224 // C++98 [class.friend]p1: A friend of a class is a function 6225 // or class that is not a member of the class . . . 6226 // This is fixed in DR77, which just barely didn't make the C++03 6227 // deadline. It's also a very silly restriction that seriously 6228 // affects inner classes and which nobody else seems to implement; 6229 // thus we never diagnose it, not even in -pedantic. 6230 // 6231 // But note that we could warn about it: it's always useless to 6232 // friend one of your own members (it's not, however, worthless to 6233 // friend a member of an arbitrary specialization of your template). 6234 6235 Decl *D; 6236 if (unsigned NumTempParamLists = TempParams.size()) 6237 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6238 NumTempParamLists, 6239 (TemplateParameterList**) TempParams.release(), 6240 TSI, 6241 DS.getFriendSpecLoc()); 6242 else 6243 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6244 6245 if (!D) 6246 return DeclPtrTy(); 6247 6248 D->setAccess(AS_public); 6249 CurContext->addDecl(D); 6250 6251 return DeclPtrTy::make(D); 6252} 6253 6254Sema::DeclPtrTy 6255Sema::ActOnFriendFunctionDecl(Scope *S, 6256 Declarator &D, 6257 bool IsDefinition, 6258 MultiTemplateParamsArg TemplateParams) { 6259 const DeclSpec &DS = D.getDeclSpec(); 6260 6261 assert(DS.isFriendSpecified()); 6262 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6263 6264 SourceLocation Loc = D.getIdentifierLoc(); 6265 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6266 QualType T = TInfo->getType(); 6267 6268 // C++ [class.friend]p1 6269 // A friend of a class is a function or class.... 6270 // Note that this sees through typedefs, which is intended. 6271 // It *doesn't* see through dependent types, which is correct 6272 // according to [temp.arg.type]p3: 6273 // If a declaration acquires a function type through a 6274 // type dependent on a template-parameter and this causes 6275 // a declaration that does not use the syntactic form of a 6276 // function declarator to have a function type, the program 6277 // is ill-formed. 6278 if (!T->isFunctionType()) { 6279 Diag(Loc, diag::err_unexpected_friend); 6280 6281 // It might be worthwhile to try to recover by creating an 6282 // appropriate declaration. 6283 return DeclPtrTy(); 6284 } 6285 6286 // C++ [namespace.memdef]p3 6287 // - If a friend declaration in a non-local class first declares a 6288 // class or function, the friend class or function is a member 6289 // of the innermost enclosing namespace. 6290 // - The name of the friend is not found by simple name lookup 6291 // until a matching declaration is provided in that namespace 6292 // scope (either before or after the class declaration granting 6293 // friendship). 6294 // - If a friend function is called, its name may be found by the 6295 // name lookup that considers functions from namespaces and 6296 // classes associated with the types of the function arguments. 6297 // - When looking for a prior declaration of a class or a function 6298 // declared as a friend, scopes outside the innermost enclosing 6299 // namespace scope are not considered. 6300 6301 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 6302 DeclarationName Name = GetNameForDeclarator(D); 6303 assert(Name); 6304 6305 // The context we found the declaration in, or in which we should 6306 // create the declaration. 6307 DeclContext *DC; 6308 6309 // FIXME: handle local classes 6310 6311 // Recover from invalid scope qualifiers as if they just weren't there. 6312 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 6313 ForRedeclaration); 6314 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 6315 DC = computeDeclContext(ScopeQual); 6316 6317 // FIXME: handle dependent contexts 6318 if (!DC) return DeclPtrTy(); 6319 if (RequireCompleteDeclContext(ScopeQual, DC)) return DeclPtrTy(); 6320 6321 LookupQualifiedName(Previous, DC); 6322 6323 // Ignore things found implicitly in the wrong scope. 6324 // TODO: better diagnostics for this case. Suggesting the right 6325 // qualified scope would be nice... 6326 LookupResult::Filter F = Previous.makeFilter(); 6327 while (F.hasNext()) { 6328 NamedDecl *D = F.next(); 6329 if (!D->getDeclContext()->getLookupContext()->Equals(DC)) 6330 F.erase(); 6331 } 6332 F.done(); 6333 6334 if (Previous.empty()) { 6335 D.setInvalidType(); 6336 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6337 return DeclPtrTy(); 6338 } 6339 6340 // C++ [class.friend]p1: A friend of a class is a function or 6341 // class that is not a member of the class . . . 6342 if (DC->Equals(CurContext)) 6343 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6344 6345 // Otherwise walk out to the nearest namespace scope looking for matches. 6346 } else { 6347 // TODO: handle local class contexts. 6348 6349 DC = CurContext; 6350 while (true) { 6351 // Skip class contexts. If someone can cite chapter and verse 6352 // for this behavior, that would be nice --- it's what GCC and 6353 // EDG do, and it seems like a reasonable intent, but the spec 6354 // really only says that checks for unqualified existing 6355 // declarations should stop at the nearest enclosing namespace, 6356 // not that they should only consider the nearest enclosing 6357 // namespace. 6358 while (DC->isRecord()) 6359 DC = DC->getParent(); 6360 6361 LookupQualifiedName(Previous, DC); 6362 6363 // TODO: decide what we think about using declarations. 6364 if (!Previous.empty()) 6365 break; 6366 6367 if (DC->isFileContext()) break; 6368 DC = DC->getParent(); 6369 } 6370 6371 // C++ [class.friend]p1: A friend of a class is a function or 6372 // class that is not a member of the class . . . 6373 // C++0x changes this for both friend types and functions. 6374 // Most C++ 98 compilers do seem to give an error here, so 6375 // we do, too. 6376 if (!Previous.empty() && DC->Equals(CurContext) 6377 && !getLangOptions().CPlusPlus0x) 6378 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6379 } 6380 6381 if (DC->isFileContext()) { 6382 // This implies that it has to be an operator or function. 6383 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6384 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6385 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6386 Diag(Loc, diag::err_introducing_special_friend) << 6387 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6388 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6389 return DeclPtrTy(); 6390 } 6391 } 6392 6393 bool Redeclaration = false; 6394 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 6395 move(TemplateParams), 6396 IsDefinition, 6397 Redeclaration); 6398 if (!ND) return DeclPtrTy(); 6399 6400 assert(ND->getDeclContext() == DC); 6401 assert(ND->getLexicalDeclContext() == CurContext); 6402 6403 // Add the function declaration to the appropriate lookup tables, 6404 // adjusting the redeclarations list as necessary. We don't 6405 // want to do this yet if the friending class is dependent. 6406 // 6407 // Also update the scope-based lookup if the target context's 6408 // lookup context is in lexical scope. 6409 if (!CurContext->isDependentContext()) { 6410 DC = DC->getLookupContext(); 6411 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6412 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6413 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6414 } 6415 6416 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6417 D.getIdentifierLoc(), ND, 6418 DS.getFriendSpecLoc()); 6419 FrD->setAccess(AS_public); 6420 CurContext->addDecl(FrD); 6421 6422 return DeclPtrTy::make(ND); 6423} 6424 6425void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 6426 AdjustDeclIfTemplate(dcl); 6427 6428 Decl *Dcl = dcl.getAs<Decl>(); 6429 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6430 if (!Fn) { 6431 Diag(DelLoc, diag::err_deleted_non_function); 6432 return; 6433 } 6434 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6435 Diag(DelLoc, diag::err_deleted_decl_not_first); 6436 Diag(Prev->getLocation(), diag::note_previous_declaration); 6437 // If the declaration wasn't the first, we delete the function anyway for 6438 // recovery. 6439 } 6440 Fn->setDeleted(); 6441} 6442 6443static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6444 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6445 ++CI) { 6446 Stmt *SubStmt = *CI; 6447 if (!SubStmt) 6448 continue; 6449 if (isa<ReturnStmt>(SubStmt)) 6450 Self.Diag(SubStmt->getSourceRange().getBegin(), 6451 diag::err_return_in_constructor_handler); 6452 if (!isa<Expr>(SubStmt)) 6453 SearchForReturnInStmt(Self, SubStmt); 6454 } 6455} 6456 6457void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6458 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6459 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6460 SearchForReturnInStmt(*this, Handler); 6461 } 6462} 6463 6464bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6465 const CXXMethodDecl *Old) { 6466 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6467 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6468 6469 if (Context.hasSameType(NewTy, OldTy) || 6470 NewTy->isDependentType() || OldTy->isDependentType()) 6471 return false; 6472 6473 // Check if the return types are covariant 6474 QualType NewClassTy, OldClassTy; 6475 6476 /// Both types must be pointers or references to classes. 6477 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6478 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6479 NewClassTy = NewPT->getPointeeType(); 6480 OldClassTy = OldPT->getPointeeType(); 6481 } 6482 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6483 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6484 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6485 NewClassTy = NewRT->getPointeeType(); 6486 OldClassTy = OldRT->getPointeeType(); 6487 } 6488 } 6489 } 6490 6491 // The return types aren't either both pointers or references to a class type. 6492 if (NewClassTy.isNull()) { 6493 Diag(New->getLocation(), 6494 diag::err_different_return_type_for_overriding_virtual_function) 6495 << New->getDeclName() << NewTy << OldTy; 6496 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6497 6498 return true; 6499 } 6500 6501 // C++ [class.virtual]p6: 6502 // If the return type of D::f differs from the return type of B::f, the 6503 // class type in the return type of D::f shall be complete at the point of 6504 // declaration of D::f or shall be the class type D. 6505 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6506 if (!RT->isBeingDefined() && 6507 RequireCompleteType(New->getLocation(), NewClassTy, 6508 PDiag(diag::err_covariant_return_incomplete) 6509 << New->getDeclName())) 6510 return true; 6511 } 6512 6513 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6514 // Check if the new class derives from the old class. 6515 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6516 Diag(New->getLocation(), 6517 diag::err_covariant_return_not_derived) 6518 << New->getDeclName() << NewTy << OldTy; 6519 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6520 return true; 6521 } 6522 6523 // Check if we the conversion from derived to base is valid. 6524 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6525 diag::err_covariant_return_inaccessible_base, 6526 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6527 // FIXME: Should this point to the return type? 6528 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6529 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6530 return true; 6531 } 6532 } 6533 6534 // The qualifiers of the return types must be the same. 6535 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6536 Diag(New->getLocation(), 6537 diag::err_covariant_return_type_different_qualifications) 6538 << New->getDeclName() << NewTy << OldTy; 6539 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6540 return true; 6541 }; 6542 6543 6544 // The new class type must have the same or less qualifiers as the old type. 6545 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6546 Diag(New->getLocation(), 6547 diag::err_covariant_return_type_class_type_more_qualified) 6548 << New->getDeclName() << NewTy << OldTy; 6549 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6550 return true; 6551 }; 6552 6553 return false; 6554} 6555 6556bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6557 const CXXMethodDecl *Old) 6558{ 6559 if (Old->hasAttr<FinalAttr>()) { 6560 Diag(New->getLocation(), diag::err_final_function_overridden) 6561 << New->getDeclName(); 6562 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6563 return true; 6564 } 6565 6566 return false; 6567} 6568 6569/// \brief Mark the given method pure. 6570/// 6571/// \param Method the method to be marked pure. 6572/// 6573/// \param InitRange the source range that covers the "0" initializer. 6574bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6575 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6576 Method->setPure(); 6577 6578 // A class is abstract if at least one function is pure virtual. 6579 Method->getParent()->setAbstract(true); 6580 return false; 6581 } 6582 6583 if (!Method->isInvalidDecl()) 6584 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6585 << Method->getDeclName() << InitRange; 6586 return true; 6587} 6588 6589/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6590/// an initializer for the out-of-line declaration 'Dcl'. The scope 6591/// is a fresh scope pushed for just this purpose. 6592/// 6593/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6594/// static data member of class X, names should be looked up in the scope of 6595/// class X. 6596void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6597 // If there is no declaration, there was an error parsing it. 6598 Decl *D = Dcl.getAs<Decl>(); 6599 if (D == 0) return; 6600 6601 // We should only get called for declarations with scope specifiers, like: 6602 // int foo::bar; 6603 assert(D->isOutOfLine()); 6604 EnterDeclaratorContext(S, D->getDeclContext()); 6605} 6606 6607/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6608/// initializer for the out-of-line declaration 'Dcl'. 6609void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6610 // If there is no declaration, there was an error parsing it. 6611 Decl *D = Dcl.getAs<Decl>(); 6612 if (D == 0) return; 6613 6614 assert(D->isOutOfLine()); 6615 ExitDeclaratorContext(S); 6616} 6617 6618/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6619/// C++ if/switch/while/for statement. 6620/// e.g: "if (int x = f()) {...}" 6621Action::DeclResult 6622Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6623 // C++ 6.4p2: 6624 // The declarator shall not specify a function or an array. 6625 // The type-specifier-seq shall not contain typedef and shall not declare a 6626 // new class or enumeration. 6627 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6628 "Parser allowed 'typedef' as storage class of condition decl."); 6629 6630 TagDecl *OwnedTag = 0; 6631 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6632 QualType Ty = TInfo->getType(); 6633 6634 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6635 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6636 // would be created and CXXConditionDeclExpr wants a VarDecl. 6637 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6638 << D.getSourceRange(); 6639 return DeclResult(); 6640 } else if (OwnedTag && OwnedTag->isDefinition()) { 6641 // The type-specifier-seq shall not declare a new class or enumeration. 6642 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6643 } 6644 6645 DeclPtrTy Dcl = ActOnDeclarator(S, D); 6646 if (!Dcl) 6647 return DeclResult(); 6648 6649 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 6650 VD->setDeclaredInCondition(true); 6651 return Dcl; 6652} 6653 6654void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6655 bool DefinitionRequired) { 6656 // Ignore any vtable uses in unevaluated operands or for classes that do 6657 // not have a vtable. 6658 if (!Class->isDynamicClass() || Class->isDependentContext() || 6659 CurContext->isDependentContext() || 6660 ExprEvalContexts.back().Context == Unevaluated) 6661 return; 6662 6663 // Try to insert this class into the map. 6664 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6665 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6666 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6667 if (!Pos.second) { 6668 // If we already had an entry, check to see if we are promoting this vtable 6669 // to required a definition. If so, we need to reappend to the VTableUses 6670 // list, since we may have already processed the first entry. 6671 if (DefinitionRequired && !Pos.first->second) { 6672 Pos.first->second = true; 6673 } else { 6674 // Otherwise, we can early exit. 6675 return; 6676 } 6677 } 6678 6679 // Local classes need to have their virtual members marked 6680 // immediately. For all other classes, we mark their virtual members 6681 // at the end of the translation unit. 6682 if (Class->isLocalClass()) 6683 MarkVirtualMembersReferenced(Loc, Class); 6684 else 6685 VTableUses.push_back(std::make_pair(Class, Loc)); 6686} 6687 6688bool Sema::DefineUsedVTables() { 6689 // If any dynamic classes have their key function defined within 6690 // this translation unit, then those vtables are considered "used" and must 6691 // be emitted. 6692 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6693 if (const CXXMethodDecl *KeyFunction 6694 = Context.getKeyFunction(DynamicClasses[I])) { 6695 const FunctionDecl *Definition = 0; 6696 if (KeyFunction->hasBody(Definition)) 6697 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6698 } 6699 } 6700 6701 if (VTableUses.empty()) 6702 return false; 6703 6704 // Note: The VTableUses vector could grow as a result of marking 6705 // the members of a class as "used", so we check the size each 6706 // time through the loop and prefer indices (with are stable) to 6707 // iterators (which are not). 6708 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6709 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6710 if (!Class) 6711 continue; 6712 6713 SourceLocation Loc = VTableUses[I].second; 6714 6715 // If this class has a key function, but that key function is 6716 // defined in another translation unit, we don't need to emit the 6717 // vtable even though we're using it. 6718 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6719 if (KeyFunction && !KeyFunction->hasBody()) { 6720 switch (KeyFunction->getTemplateSpecializationKind()) { 6721 case TSK_Undeclared: 6722 case TSK_ExplicitSpecialization: 6723 case TSK_ExplicitInstantiationDeclaration: 6724 // The key function is in another translation unit. 6725 continue; 6726 6727 case TSK_ExplicitInstantiationDefinition: 6728 case TSK_ImplicitInstantiation: 6729 // We will be instantiating the key function. 6730 break; 6731 } 6732 } else if (!KeyFunction) { 6733 // If we have a class with no key function that is the subject 6734 // of an explicit instantiation declaration, suppress the 6735 // vtable; it will live with the explicit instantiation 6736 // definition. 6737 bool IsExplicitInstantiationDeclaration 6738 = Class->getTemplateSpecializationKind() 6739 == TSK_ExplicitInstantiationDeclaration; 6740 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6741 REnd = Class->redecls_end(); 6742 R != REnd; ++R) { 6743 TemplateSpecializationKind TSK 6744 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6745 if (TSK == TSK_ExplicitInstantiationDeclaration) 6746 IsExplicitInstantiationDeclaration = true; 6747 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6748 IsExplicitInstantiationDeclaration = false; 6749 break; 6750 } 6751 } 6752 6753 if (IsExplicitInstantiationDeclaration) 6754 continue; 6755 } 6756 6757 // Mark all of the virtual members of this class as referenced, so 6758 // that we can build a vtable. Then, tell the AST consumer that a 6759 // vtable for this class is required. 6760 MarkVirtualMembersReferenced(Loc, Class); 6761 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6762 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6763 6764 // Optionally warn if we're emitting a weak vtable. 6765 if (Class->getLinkage() == ExternalLinkage && 6766 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6767 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 6768 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6769 } 6770 } 6771 VTableUses.clear(); 6772 6773 return true; 6774} 6775 6776void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6777 const CXXRecordDecl *RD) { 6778 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6779 e = RD->method_end(); i != e; ++i) { 6780 CXXMethodDecl *MD = *i; 6781 6782 // C++ [basic.def.odr]p2: 6783 // [...] A virtual member function is used if it is not pure. [...] 6784 if (MD->isVirtual() && !MD->isPure()) 6785 MarkDeclarationReferenced(Loc, MD); 6786 } 6787 6788 // Only classes that have virtual bases need a VTT. 6789 if (RD->getNumVBases() == 0) 6790 return; 6791 6792 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6793 e = RD->bases_end(); i != e; ++i) { 6794 const CXXRecordDecl *Base = 6795 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6796 if (i->isVirtual()) 6797 continue; 6798 if (Base->getNumVBases() == 0) 6799 continue; 6800 MarkVirtualMembersReferenced(Loc, Base); 6801 } 6802} 6803 6804/// SetIvarInitializers - This routine builds initialization ASTs for the 6805/// Objective-C implementation whose ivars need be initialized. 6806void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6807 if (!getLangOptions().CPlusPlus) 6808 return; 6809 if (const ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6810 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6811 CollectIvarsToConstructOrDestruct(OID, ivars); 6812 if (ivars.empty()) 6813 return; 6814 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6815 for (unsigned i = 0; i < ivars.size(); i++) { 6816 FieldDecl *Field = ivars[i]; 6817 if (Field->isInvalidDecl()) 6818 continue; 6819 6820 CXXBaseOrMemberInitializer *Member; 6821 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6822 InitializationKind InitKind = 6823 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6824 6825 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6826 Sema::OwningExprResult MemberInit = 6827 InitSeq.Perform(*this, InitEntity, InitKind, 6828 Sema::MultiExprArg(*this, 0, 0)); 6829 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 6830 // Note, MemberInit could actually come back empty if no initialization 6831 // is required (e.g., because it would call a trivial default constructor) 6832 if (!MemberInit.get() || MemberInit.isInvalid()) 6833 continue; 6834 6835 Member = 6836 new (Context) CXXBaseOrMemberInitializer(Context, 6837 Field, SourceLocation(), 6838 SourceLocation(), 6839 MemberInit.takeAs<Expr>(), 6840 SourceLocation()); 6841 AllToInit.push_back(Member); 6842 6843 // Be sure that the destructor is accessible and is marked as referenced. 6844 if (const RecordType *RecordTy 6845 = Context.getBaseElementType(Field->getType()) 6846 ->getAs<RecordType>()) { 6847 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6848 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 6849 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6850 CheckDestructorAccess(Field->getLocation(), Destructor, 6851 PDiag(diag::err_access_dtor_ivar) 6852 << Context.getBaseElementType(Field->getType())); 6853 } 6854 } 6855 } 6856 ObjCImplementation->setIvarInitializers(Context, 6857 AllToInit.data(), AllToInit.size()); 6858 } 6859} 6860