SemaDeclCXX.cpp revision 1827403a7138946305c0058f262e02b595cf882f
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 QualType FieldType = Member->getType(); 1289 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1290 FieldType = Array->getElementType(); 1291 if (FieldType->isDependentType() || HasDependentArg) { 1292 // Can't check initialization for a member of dependent type or when 1293 // any of the arguments are type-dependent expressions. 1294 OwningExprResult Init 1295 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1296 RParenLoc)); 1297 1298 // Erase any temporaries within this evaluation context; we're not 1299 // going to track them in the AST, since we'll be rebuilding the 1300 // ASTs during template instantiation. 1301 ExprTemporaries.erase( 1302 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1303 ExprTemporaries.end()); 1304 1305 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1306 LParenLoc, 1307 Init.takeAs<Expr>(), 1308 RParenLoc); 1309 1310 } 1311 1312 if (Member->isInvalidDecl()) 1313 return true; 1314 1315 // Initialize the member. 1316 InitializedEntity MemberEntity = 1317 InitializedEntity::InitializeMember(Member, 0); 1318 InitializationKind Kind = 1319 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1320 1321 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1322 1323 OwningExprResult MemberInit = 1324 InitSeq.Perform(*this, MemberEntity, Kind, 1325 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1326 if (MemberInit.isInvalid()) 1327 return true; 1328 1329 // C++0x [class.base.init]p7: 1330 // The initialization of each base and member constitutes a 1331 // full-expression. 1332 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1333 if (MemberInit.isInvalid()) 1334 return true; 1335 1336 // If we are in a dependent context, template instantiation will 1337 // perform this type-checking again. Just save the arguments that we 1338 // received in a ParenListExpr. 1339 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1340 // of the information that we have about the member 1341 // initializer. However, deconstructing the ASTs is a dicey process, 1342 // and this approach is far more likely to get the corner cases right. 1343 if (CurContext->isDependentContext()) { 1344 // Bump the reference count of all of the arguments. 1345 for (unsigned I = 0; I != NumArgs; ++I) 1346 Args[I]->Retain(); 1347 1348 OwningExprResult Init 1349 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1350 RParenLoc)); 1351 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1352 LParenLoc, 1353 Init.takeAs<Expr>(), 1354 RParenLoc); 1355 } 1356 1357 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1358 LParenLoc, 1359 MemberInit.takeAs<Expr>(), 1360 RParenLoc); 1361} 1362 1363Sema::MemInitResult 1364Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1365 Expr **Args, unsigned NumArgs, 1366 SourceLocation LParenLoc, SourceLocation RParenLoc, 1367 CXXRecordDecl *ClassDecl) { 1368 bool HasDependentArg = false; 1369 for (unsigned i = 0; i < NumArgs; i++) 1370 HasDependentArg |= Args[i]->isTypeDependent(); 1371 1372 SourceLocation BaseLoc 1373 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1374 1375 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1376 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1377 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1378 1379 // C++ [class.base.init]p2: 1380 // [...] Unless the mem-initializer-id names a nonstatic data 1381 // member of the constructor’s class or a direct or virtual base 1382 // of that class, the mem-initializer is ill-formed. A 1383 // mem-initializer-list can initialize a base class using any 1384 // name that denotes that base class type. 1385 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1386 1387 // Check for direct and virtual base classes. 1388 const CXXBaseSpecifier *DirectBaseSpec = 0; 1389 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1390 if (!Dependent) { 1391 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1392 VirtualBaseSpec); 1393 1394 // C++ [base.class.init]p2: 1395 // Unless the mem-initializer-id names a nonstatic data member of the 1396 // constructor's class or a direct or virtual base of that class, the 1397 // mem-initializer is ill-formed. 1398 if (!DirectBaseSpec && !VirtualBaseSpec) { 1399 // If the class has any dependent bases, then it's possible that 1400 // one of those types will resolve to the same type as 1401 // BaseType. Therefore, just treat this as a dependent base 1402 // class initialization. FIXME: Should we try to check the 1403 // initialization anyway? It seems odd. 1404 if (ClassDecl->hasAnyDependentBases()) 1405 Dependent = true; 1406 else 1407 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1408 << BaseType << Context.getTypeDeclType(ClassDecl) 1409 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1410 } 1411 } 1412 1413 if (Dependent) { 1414 // Can't check initialization for a base of dependent type or when 1415 // any of the arguments are type-dependent expressions. 1416 OwningExprResult BaseInit 1417 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1418 RParenLoc)); 1419 1420 // Erase any temporaries within this evaluation context; we're not 1421 // going to track them in the AST, since we'll be rebuilding the 1422 // ASTs during template instantiation. 1423 ExprTemporaries.erase( 1424 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1425 ExprTemporaries.end()); 1426 1427 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1428 /*IsVirtual=*/false, 1429 LParenLoc, 1430 BaseInit.takeAs<Expr>(), 1431 RParenLoc); 1432 } 1433 1434 // C++ [base.class.init]p2: 1435 // If a mem-initializer-id is ambiguous because it designates both 1436 // a direct non-virtual base class and an inherited virtual base 1437 // class, the mem-initializer is ill-formed. 1438 if (DirectBaseSpec && VirtualBaseSpec) 1439 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1440 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1441 1442 CXXBaseSpecifier *BaseSpec 1443 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1444 if (!BaseSpec) 1445 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1446 1447 // Initialize the base. 1448 InitializedEntity BaseEntity = 1449 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1450 InitializationKind Kind = 1451 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1452 1453 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1454 1455 OwningExprResult BaseInit = 1456 InitSeq.Perform(*this, BaseEntity, Kind, 1457 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1458 if (BaseInit.isInvalid()) 1459 return true; 1460 1461 // C++0x [class.base.init]p7: 1462 // The initialization of each base and member constitutes a 1463 // full-expression. 1464 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1465 if (BaseInit.isInvalid()) 1466 return true; 1467 1468 // If we are in a dependent context, template instantiation will 1469 // perform this type-checking again. Just save the arguments that we 1470 // received in a ParenListExpr. 1471 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1472 // of the information that we have about the base 1473 // initializer. However, deconstructing the ASTs is a dicey process, 1474 // and this approach is far more likely to get the corner cases right. 1475 if (CurContext->isDependentContext()) { 1476 // Bump the reference count of all of the arguments. 1477 for (unsigned I = 0; I != NumArgs; ++I) 1478 Args[I]->Retain(); 1479 1480 OwningExprResult Init 1481 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1482 RParenLoc)); 1483 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1484 BaseSpec->isVirtual(), 1485 LParenLoc, 1486 Init.takeAs<Expr>(), 1487 RParenLoc); 1488 } 1489 1490 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1491 BaseSpec->isVirtual(), 1492 LParenLoc, 1493 BaseInit.takeAs<Expr>(), 1494 RParenLoc); 1495} 1496 1497/// ImplicitInitializerKind - How an implicit base or member initializer should 1498/// initialize its base or member. 1499enum ImplicitInitializerKind { 1500 IIK_Default, 1501 IIK_Copy, 1502 IIK_Move 1503}; 1504 1505static bool 1506BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1507 ImplicitInitializerKind ImplicitInitKind, 1508 CXXBaseSpecifier *BaseSpec, 1509 bool IsInheritedVirtualBase, 1510 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1511 InitializedEntity InitEntity 1512 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1513 IsInheritedVirtualBase); 1514 1515 Sema::OwningExprResult BaseInit(SemaRef); 1516 1517 switch (ImplicitInitKind) { 1518 case IIK_Default: { 1519 InitializationKind InitKind 1520 = InitializationKind::CreateDefault(Constructor->getLocation()); 1521 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1522 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1523 Sema::MultiExprArg(SemaRef, 0, 0)); 1524 break; 1525 } 1526 1527 case IIK_Copy: { 1528 ParmVarDecl *Param = Constructor->getParamDecl(0); 1529 QualType ParamType = Param->getType().getNonReferenceType(); 1530 1531 Expr *CopyCtorArg = 1532 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1533 Constructor->getLocation(), ParamType, 0); 1534 1535 // Cast to the base class to avoid ambiguities. 1536 QualType ArgTy = 1537 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1538 ParamType.getQualifiers()); 1539 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1540 CastExpr::CK_UncheckedDerivedToBase, 1541 /*isLvalue=*/true, 1542 CXXBaseSpecifierArray(BaseSpec)); 1543 1544 InitializationKind InitKind 1545 = InitializationKind::CreateDirect(Constructor->getLocation(), 1546 SourceLocation(), SourceLocation()); 1547 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1548 &CopyCtorArg, 1); 1549 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1550 Sema::MultiExprArg(SemaRef, 1551 (void**)&CopyCtorArg, 1)); 1552 break; 1553 } 1554 1555 case IIK_Move: 1556 assert(false && "Unhandled initializer kind!"); 1557 } 1558 1559 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1560 if (BaseInit.isInvalid()) 1561 return true; 1562 1563 CXXBaseInit = 1564 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1565 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1566 SourceLocation()), 1567 BaseSpec->isVirtual(), 1568 SourceLocation(), 1569 BaseInit.takeAs<Expr>(), 1570 SourceLocation()); 1571 1572 return false; 1573} 1574 1575static bool 1576BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1577 ImplicitInitializerKind ImplicitInitKind, 1578 FieldDecl *Field, 1579 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1580 if (Field->isInvalidDecl()) 1581 return true; 1582 1583 SourceLocation Loc = Constructor->getLocation(); 1584 1585 if (ImplicitInitKind == IIK_Copy) { 1586 ParmVarDecl *Param = Constructor->getParamDecl(0); 1587 QualType ParamType = Param->getType().getNonReferenceType(); 1588 1589 Expr *MemberExprBase = 1590 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1591 Loc, ParamType, 0); 1592 1593 // Build a reference to this field within the parameter. 1594 CXXScopeSpec SS; 1595 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1596 Sema::LookupMemberName); 1597 MemberLookup.addDecl(Field, AS_public); 1598 MemberLookup.resolveKind(); 1599 Sema::OwningExprResult CopyCtorArg 1600 = SemaRef.BuildMemberReferenceExpr(SemaRef.Owned(MemberExprBase), 1601 ParamType, Loc, 1602 /*IsArrow=*/false, 1603 SS, 1604 /*FirstQualifierInScope=*/0, 1605 MemberLookup, 1606 /*TemplateArgs=*/0); 1607 if (CopyCtorArg.isInvalid()) 1608 return true; 1609 1610 // When the field we are copying is an array, create index variables for 1611 // each dimension of the array. We use these index variables to subscript 1612 // the source array, and other clients (e.g., CodeGen) will perform the 1613 // necessary iteration with these index variables. 1614 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1615 QualType BaseType = Field->getType(); 1616 QualType SizeType = SemaRef.Context.getSizeType(); 1617 while (const ConstantArrayType *Array 1618 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1619 // Create the iteration variable for this array index. 1620 IdentifierInfo *IterationVarName = 0; 1621 { 1622 llvm::SmallString<8> Str; 1623 llvm::raw_svector_ostream OS(Str); 1624 OS << "__i" << IndexVariables.size(); 1625 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1626 } 1627 VarDecl *IterationVar 1628 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1629 IterationVarName, SizeType, 1630 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1631 VarDecl::None, VarDecl::None); 1632 IndexVariables.push_back(IterationVar); 1633 1634 // Create a reference to the iteration variable. 1635 Sema::OwningExprResult IterationVarRef 1636 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1637 assert(!IterationVarRef.isInvalid() && 1638 "Reference to invented variable cannot fail!"); 1639 1640 // Subscript the array with this iteration variable. 1641 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(move(CopyCtorArg), 1642 Loc, 1643 move(IterationVarRef), 1644 Loc); 1645 if (CopyCtorArg.isInvalid()) 1646 return true; 1647 1648 BaseType = Array->getElementType(); 1649 } 1650 1651 // Construct the entity that we will be initializing. For an array, this 1652 // will be first element in the array, which may require several levels 1653 // of array-subscript entities. 1654 llvm::SmallVector<InitializedEntity, 4> Entities; 1655 Entities.reserve(1 + IndexVariables.size()); 1656 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1657 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1658 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1659 0, 1660 Entities.back())); 1661 1662 // Direct-initialize to use the copy constructor. 1663 InitializationKind InitKind = 1664 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1665 1666 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1667 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1668 &CopyCtorArgE, 1); 1669 1670 Sema::OwningExprResult MemberInit 1671 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1672 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArgE, 1)); 1673 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1674 if (MemberInit.isInvalid()) 1675 return true; 1676 1677 CXXMemberInit 1678 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1679 MemberInit.takeAs<Expr>(), Loc, 1680 IndexVariables.data(), 1681 IndexVariables.size()); 1682 return false; 1683 } 1684 1685 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1686 1687 QualType FieldBaseElementType = 1688 SemaRef.Context.getBaseElementType(Field->getType()); 1689 1690 if (FieldBaseElementType->isRecordType()) { 1691 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1692 InitializationKind InitKind = 1693 InitializationKind::CreateDefault(Loc); 1694 1695 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1696 Sema::OwningExprResult MemberInit = 1697 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1698 Sema::MultiExprArg(SemaRef, 0, 0)); 1699 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1700 if (MemberInit.isInvalid()) 1701 return true; 1702 1703 CXXMemberInit = 1704 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1705 Field, Loc, Loc, 1706 MemberInit.takeAs<Expr>(), 1707 Loc); 1708 return false; 1709 } 1710 1711 if (FieldBaseElementType->isReferenceType()) { 1712 SemaRef.Diag(Constructor->getLocation(), 1713 diag::err_uninitialized_member_in_ctor) 1714 << (int)Constructor->isImplicit() 1715 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1716 << 0 << Field->getDeclName(); 1717 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1718 return true; 1719 } 1720 1721 if (FieldBaseElementType.isConstQualified()) { 1722 SemaRef.Diag(Constructor->getLocation(), 1723 diag::err_uninitialized_member_in_ctor) 1724 << (int)Constructor->isImplicit() 1725 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1726 << 1 << Field->getDeclName(); 1727 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1728 return true; 1729 } 1730 1731 // Nothing to initialize. 1732 CXXMemberInit = 0; 1733 return false; 1734} 1735 1736namespace { 1737struct BaseAndFieldInfo { 1738 Sema &S; 1739 CXXConstructorDecl *Ctor; 1740 bool AnyErrorsInInits; 1741 ImplicitInitializerKind IIK; 1742 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1743 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1744 1745 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1746 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1747 // FIXME: Handle implicit move constructors. 1748 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1749 IIK = IIK_Copy; 1750 else 1751 IIK = IIK_Default; 1752 } 1753}; 1754} 1755 1756static void RecordFieldInitializer(BaseAndFieldInfo &Info, 1757 FieldDecl *Top, FieldDecl *Field, 1758 CXXBaseOrMemberInitializer *Init) { 1759 // If the member doesn't need to be initialized, Init will still be null. 1760 if (!Init) 1761 return; 1762 1763 Info.AllToInit.push_back(Init); 1764 if (Field != Top) { 1765 Init->setMember(Top); 1766 Init->setAnonUnionMember(Field); 1767 } 1768} 1769 1770static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1771 FieldDecl *Top, FieldDecl *Field) { 1772 1773 // Overwhelmingly common case: we have a direct initializer for this field. 1774 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1775 RecordFieldInitializer(Info, Top, Field, Init); 1776 return false; 1777 } 1778 1779 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1780 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1781 assert(FieldClassType && "anonymous struct/union without record type"); 1782 CXXRecordDecl *FieldClassDecl 1783 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1784 1785 // Even though union members never have non-trivial default 1786 // constructions in C++03, we still build member initializers for aggregate 1787 // record types which can be union members, and C++0x allows non-trivial 1788 // default constructors for union members, so we ensure that only one 1789 // member is initialized for these. 1790 if (FieldClassDecl->isUnion()) { 1791 // First check for an explicit initializer for one field. 1792 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1793 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1794 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1795 RecordFieldInitializer(Info, Top, *FA, Init); 1796 1797 // Once we've initialized a field of an anonymous union, the union 1798 // field in the class is also initialized, so exit immediately. 1799 return false; 1800 } 1801 } 1802 1803 // Fallthrough and construct a default initializer for the union as 1804 // a whole, which can call its default constructor if such a thing exists 1805 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1806 // behavior going forward with C++0x, when anonymous unions there are 1807 // finalized, we should revisit this. 1808 } else { 1809 // For structs, we simply descend through to initialize all members where 1810 // necessary. 1811 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1812 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1813 if (CollectFieldInitializer(Info, Top, *FA)) 1814 return true; 1815 } 1816 } 1817 } 1818 1819 // Don't try to build an implicit initializer if there were semantic 1820 // errors in any of the initializers (and therefore we might be 1821 // missing some that the user actually wrote). 1822 if (Info.AnyErrorsInInits) 1823 return false; 1824 1825 CXXBaseOrMemberInitializer *Init = 0; 1826 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1827 return true; 1828 1829 RecordFieldInitializer(Info, Top, Field, Init); 1830 return false; 1831} 1832 1833bool 1834Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1835 CXXBaseOrMemberInitializer **Initializers, 1836 unsigned NumInitializers, 1837 bool AnyErrors) { 1838 if (Constructor->getDeclContext()->isDependentContext()) { 1839 // Just store the initializers as written, they will be checked during 1840 // instantiation. 1841 if (NumInitializers > 0) { 1842 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1843 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1844 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1845 memcpy(baseOrMemberInitializers, Initializers, 1846 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1847 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1848 } 1849 1850 return false; 1851 } 1852 1853 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1854 1855 // We need to build the initializer AST according to order of construction 1856 // and not what user specified in the Initializers list. 1857 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1858 if (!ClassDecl) 1859 return true; 1860 1861 bool HadError = false; 1862 1863 for (unsigned i = 0; i < NumInitializers; i++) { 1864 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1865 1866 if (Member->isBaseInitializer()) 1867 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1868 else 1869 Info.AllBaseFields[Member->getMember()] = Member; 1870 } 1871 1872 // Keep track of the direct virtual bases. 1873 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1874 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1875 E = ClassDecl->bases_end(); I != E; ++I) { 1876 if (I->isVirtual()) 1877 DirectVBases.insert(I); 1878 } 1879 1880 // Push virtual bases before others. 1881 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1882 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1883 1884 if (CXXBaseOrMemberInitializer *Value 1885 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1886 Info.AllToInit.push_back(Value); 1887 } else if (!AnyErrors) { 1888 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1889 CXXBaseOrMemberInitializer *CXXBaseInit; 1890 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1891 VBase, IsInheritedVirtualBase, 1892 CXXBaseInit)) { 1893 HadError = true; 1894 continue; 1895 } 1896 1897 Info.AllToInit.push_back(CXXBaseInit); 1898 } 1899 } 1900 1901 // Non-virtual bases. 1902 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1903 E = ClassDecl->bases_end(); Base != E; ++Base) { 1904 // Virtuals are in the virtual base list and already constructed. 1905 if (Base->isVirtual()) 1906 continue; 1907 1908 if (CXXBaseOrMemberInitializer *Value 1909 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1910 Info.AllToInit.push_back(Value); 1911 } else if (!AnyErrors) { 1912 CXXBaseOrMemberInitializer *CXXBaseInit; 1913 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1914 Base, /*IsInheritedVirtualBase=*/false, 1915 CXXBaseInit)) { 1916 HadError = true; 1917 continue; 1918 } 1919 1920 Info.AllToInit.push_back(CXXBaseInit); 1921 } 1922 } 1923 1924 // Fields. 1925 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1926 E = ClassDecl->field_end(); Field != E; ++Field) { 1927 if ((*Field)->getType()->isIncompleteArrayType()) { 1928 assert(ClassDecl->hasFlexibleArrayMember() && 1929 "Incomplete array type is not valid"); 1930 continue; 1931 } 1932 if (CollectFieldInitializer(Info, *Field, *Field)) 1933 HadError = true; 1934 } 1935 1936 NumInitializers = Info.AllToInit.size(); 1937 if (NumInitializers > 0) { 1938 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1939 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1940 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1941 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1942 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1943 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1944 1945 // Constructors implicitly reference the base and member 1946 // destructors. 1947 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1948 Constructor->getParent()); 1949 } 1950 1951 return HadError; 1952} 1953 1954static void *GetKeyForTopLevelField(FieldDecl *Field) { 1955 // For anonymous unions, use the class declaration as the key. 1956 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1957 if (RT->getDecl()->isAnonymousStructOrUnion()) 1958 return static_cast<void *>(RT->getDecl()); 1959 } 1960 return static_cast<void *>(Field); 1961} 1962 1963static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1964 return Context.getCanonicalType(BaseType).getTypePtr(); 1965} 1966 1967static void *GetKeyForMember(ASTContext &Context, 1968 CXXBaseOrMemberInitializer *Member, 1969 bool MemberMaybeAnon = false) { 1970 if (!Member->isMemberInitializer()) 1971 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1972 1973 // For fields injected into the class via declaration of an anonymous union, 1974 // use its anonymous union class declaration as the unique key. 1975 FieldDecl *Field = Member->getMember(); 1976 1977 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1978 // data member of the class. Data member used in the initializer list is 1979 // in AnonUnionMember field. 1980 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1981 Field = Member->getAnonUnionMember(); 1982 1983 // If the field is a member of an anonymous struct or union, our key 1984 // is the anonymous record decl that's a direct child of the class. 1985 RecordDecl *RD = Field->getParent(); 1986 if (RD->isAnonymousStructOrUnion()) { 1987 while (true) { 1988 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1989 if (Parent->isAnonymousStructOrUnion()) 1990 RD = Parent; 1991 else 1992 break; 1993 } 1994 1995 return static_cast<void *>(RD); 1996 } 1997 1998 return static_cast<void *>(Field); 1999} 2000 2001static void 2002DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2003 const CXXConstructorDecl *Constructor, 2004 CXXBaseOrMemberInitializer **Inits, 2005 unsigned NumInits) { 2006 if (Constructor->getDeclContext()->isDependentContext()) 2007 return; 2008 2009 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 2010 == Diagnostic::Ignored) 2011 return; 2012 2013 // Build the list of bases and members in the order that they'll 2014 // actually be initialized. The explicit initializers should be in 2015 // this same order but may be missing things. 2016 llvm::SmallVector<const void*, 32> IdealInitKeys; 2017 2018 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2019 2020 // 1. Virtual bases. 2021 for (CXXRecordDecl::base_class_const_iterator VBase = 2022 ClassDecl->vbases_begin(), 2023 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2024 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2025 2026 // 2. Non-virtual bases. 2027 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2028 E = ClassDecl->bases_end(); Base != E; ++Base) { 2029 if (Base->isVirtual()) 2030 continue; 2031 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2032 } 2033 2034 // 3. Direct fields. 2035 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2036 E = ClassDecl->field_end(); Field != E; ++Field) 2037 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2038 2039 unsigned NumIdealInits = IdealInitKeys.size(); 2040 unsigned IdealIndex = 0; 2041 2042 CXXBaseOrMemberInitializer *PrevInit = 0; 2043 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2044 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2045 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2046 2047 // Scan forward to try to find this initializer in the idealized 2048 // initializers list. 2049 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2050 if (InitKey == IdealInitKeys[IdealIndex]) 2051 break; 2052 2053 // If we didn't find this initializer, it must be because we 2054 // scanned past it on a previous iteration. That can only 2055 // happen if we're out of order; emit a warning. 2056 if (IdealIndex == NumIdealInits && PrevInit) { 2057 Sema::SemaDiagnosticBuilder D = 2058 SemaRef.Diag(PrevInit->getSourceLocation(), 2059 diag::warn_initializer_out_of_order); 2060 2061 if (PrevInit->isMemberInitializer()) 2062 D << 0 << PrevInit->getMember()->getDeclName(); 2063 else 2064 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2065 2066 if (Init->isMemberInitializer()) 2067 D << 0 << Init->getMember()->getDeclName(); 2068 else 2069 D << 1 << Init->getBaseClassInfo()->getType(); 2070 2071 // Move back to the initializer's location in the ideal list. 2072 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2073 if (InitKey == IdealInitKeys[IdealIndex]) 2074 break; 2075 2076 assert(IdealIndex != NumIdealInits && 2077 "initializer not found in initializer list"); 2078 } 2079 2080 PrevInit = Init; 2081 } 2082} 2083 2084namespace { 2085bool CheckRedundantInit(Sema &S, 2086 CXXBaseOrMemberInitializer *Init, 2087 CXXBaseOrMemberInitializer *&PrevInit) { 2088 if (!PrevInit) { 2089 PrevInit = Init; 2090 return false; 2091 } 2092 2093 if (FieldDecl *Field = Init->getMember()) 2094 S.Diag(Init->getSourceLocation(), 2095 diag::err_multiple_mem_initialization) 2096 << Field->getDeclName() 2097 << Init->getSourceRange(); 2098 else { 2099 Type *BaseClass = Init->getBaseClass(); 2100 assert(BaseClass && "neither field nor base"); 2101 S.Diag(Init->getSourceLocation(), 2102 diag::err_multiple_base_initialization) 2103 << QualType(BaseClass, 0) 2104 << Init->getSourceRange(); 2105 } 2106 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2107 << 0 << PrevInit->getSourceRange(); 2108 2109 return true; 2110} 2111 2112typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2113typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2114 2115bool CheckRedundantUnionInit(Sema &S, 2116 CXXBaseOrMemberInitializer *Init, 2117 RedundantUnionMap &Unions) { 2118 FieldDecl *Field = Init->getMember(); 2119 RecordDecl *Parent = Field->getParent(); 2120 if (!Parent->isAnonymousStructOrUnion()) 2121 return false; 2122 2123 NamedDecl *Child = Field; 2124 do { 2125 if (Parent->isUnion()) { 2126 UnionEntry &En = Unions[Parent]; 2127 if (En.first && En.first != Child) { 2128 S.Diag(Init->getSourceLocation(), 2129 diag::err_multiple_mem_union_initialization) 2130 << Field->getDeclName() 2131 << Init->getSourceRange(); 2132 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2133 << 0 << En.second->getSourceRange(); 2134 return true; 2135 } else if (!En.first) { 2136 En.first = Child; 2137 En.second = Init; 2138 } 2139 } 2140 2141 Child = Parent; 2142 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2143 } while (Parent->isAnonymousStructOrUnion()); 2144 2145 return false; 2146} 2147} 2148 2149/// ActOnMemInitializers - Handle the member initializers for a constructor. 2150void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 2151 SourceLocation ColonLoc, 2152 MemInitTy **meminits, unsigned NumMemInits, 2153 bool AnyErrors) { 2154 if (!ConstructorDecl) 2155 return; 2156 2157 AdjustDeclIfTemplate(ConstructorDecl); 2158 2159 CXXConstructorDecl *Constructor 2160 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 2161 2162 if (!Constructor) { 2163 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2164 return; 2165 } 2166 2167 CXXBaseOrMemberInitializer **MemInits = 2168 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2169 2170 // Mapping for the duplicate initializers check. 2171 // For member initializers, this is keyed with a FieldDecl*. 2172 // For base initializers, this is keyed with a Type*. 2173 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2174 2175 // Mapping for the inconsistent anonymous-union initializers check. 2176 RedundantUnionMap MemberUnions; 2177 2178 bool HadError = false; 2179 for (unsigned i = 0; i < NumMemInits; i++) { 2180 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2181 2182 // Set the source order index. 2183 Init->setSourceOrder(i); 2184 2185 if (Init->isMemberInitializer()) { 2186 FieldDecl *Field = Init->getMember(); 2187 if (CheckRedundantInit(*this, Init, Members[Field]) || 2188 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2189 HadError = true; 2190 } else { 2191 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2192 if (CheckRedundantInit(*this, Init, Members[Key])) 2193 HadError = true; 2194 } 2195 } 2196 2197 if (HadError) 2198 return; 2199 2200 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2201 2202 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2203} 2204 2205void 2206Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2207 CXXRecordDecl *ClassDecl) { 2208 // Ignore dependent contexts. 2209 if (ClassDecl->isDependentContext()) 2210 return; 2211 2212 // FIXME: all the access-control diagnostics are positioned on the 2213 // field/base declaration. That's probably good; that said, the 2214 // user might reasonably want to know why the destructor is being 2215 // emitted, and we currently don't say. 2216 2217 // Non-static data members. 2218 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2219 E = ClassDecl->field_end(); I != E; ++I) { 2220 FieldDecl *Field = *I; 2221 if (Field->isInvalidDecl()) 2222 continue; 2223 QualType FieldType = Context.getBaseElementType(Field->getType()); 2224 2225 const RecordType* RT = FieldType->getAs<RecordType>(); 2226 if (!RT) 2227 continue; 2228 2229 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2230 if (FieldClassDecl->hasTrivialDestructor()) 2231 continue; 2232 2233 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2234 CheckDestructorAccess(Field->getLocation(), Dtor, 2235 PDiag(diag::err_access_dtor_field) 2236 << Field->getDeclName() 2237 << FieldType); 2238 2239 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2240 } 2241 2242 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2243 2244 // Bases. 2245 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2246 E = ClassDecl->bases_end(); Base != E; ++Base) { 2247 // Bases are always records in a well-formed non-dependent class. 2248 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2249 2250 // Remember direct virtual bases. 2251 if (Base->isVirtual()) 2252 DirectVirtualBases.insert(RT); 2253 2254 // Ignore trivial destructors. 2255 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2256 if (BaseClassDecl->hasTrivialDestructor()) 2257 continue; 2258 2259 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2260 2261 // FIXME: caret should be on the start of the class name 2262 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2263 PDiag(diag::err_access_dtor_base) 2264 << Base->getType() 2265 << Base->getSourceRange()); 2266 2267 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2268 } 2269 2270 // Virtual bases. 2271 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2272 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2273 2274 // Bases are always records in a well-formed non-dependent class. 2275 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2276 2277 // Ignore direct virtual bases. 2278 if (DirectVirtualBases.count(RT)) 2279 continue; 2280 2281 // Ignore trivial destructors. 2282 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2283 if (BaseClassDecl->hasTrivialDestructor()) 2284 continue; 2285 2286 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2287 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2288 PDiag(diag::err_access_dtor_vbase) 2289 << VBase->getType()); 2290 2291 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2292 } 2293} 2294 2295void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2296 if (!CDtorDecl) 2297 return; 2298 2299 if (CXXConstructorDecl *Constructor 2300 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2301 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2302} 2303 2304bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2305 unsigned DiagID, AbstractDiagSelID SelID, 2306 const CXXRecordDecl *CurrentRD) { 2307 if (SelID == -1) 2308 return RequireNonAbstractType(Loc, T, 2309 PDiag(DiagID), CurrentRD); 2310 else 2311 return RequireNonAbstractType(Loc, T, 2312 PDiag(DiagID) << SelID, CurrentRD); 2313} 2314 2315bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2316 const PartialDiagnostic &PD, 2317 const CXXRecordDecl *CurrentRD) { 2318 if (!getLangOptions().CPlusPlus) 2319 return false; 2320 2321 if (const ArrayType *AT = Context.getAsArrayType(T)) 2322 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2323 CurrentRD); 2324 2325 if (const PointerType *PT = T->getAs<PointerType>()) { 2326 // Find the innermost pointer type. 2327 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2328 PT = T; 2329 2330 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2331 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2332 } 2333 2334 const RecordType *RT = T->getAs<RecordType>(); 2335 if (!RT) 2336 return false; 2337 2338 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2339 2340 if (CurrentRD && CurrentRD != RD) 2341 return false; 2342 2343 // FIXME: is this reasonable? It matches current behavior, but.... 2344 if (!RD->getDefinition()) 2345 return false; 2346 2347 if (!RD->isAbstract()) 2348 return false; 2349 2350 Diag(Loc, PD) << RD->getDeclName(); 2351 2352 // Check if we've already emitted the list of pure virtual functions for this 2353 // class. 2354 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2355 return true; 2356 2357 CXXFinalOverriderMap FinalOverriders; 2358 RD->getFinalOverriders(FinalOverriders); 2359 2360 // Keep a set of seen pure methods so we won't diagnose the same method 2361 // more than once. 2362 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2363 2364 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2365 MEnd = FinalOverriders.end(); 2366 M != MEnd; 2367 ++M) { 2368 for (OverridingMethods::iterator SO = M->second.begin(), 2369 SOEnd = M->second.end(); 2370 SO != SOEnd; ++SO) { 2371 // C++ [class.abstract]p4: 2372 // A class is abstract if it contains or inherits at least one 2373 // pure virtual function for which the final overrider is pure 2374 // virtual. 2375 2376 // 2377 if (SO->second.size() != 1) 2378 continue; 2379 2380 if (!SO->second.front().Method->isPure()) 2381 continue; 2382 2383 if (!SeenPureMethods.insert(SO->second.front().Method)) 2384 continue; 2385 2386 Diag(SO->second.front().Method->getLocation(), 2387 diag::note_pure_virtual_function) 2388 << SO->second.front().Method->getDeclName(); 2389 } 2390 } 2391 2392 if (!PureVirtualClassDiagSet) 2393 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2394 PureVirtualClassDiagSet->insert(RD); 2395 2396 return true; 2397} 2398 2399namespace { 2400 class AbstractClassUsageDiagnoser 2401 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2402 Sema &SemaRef; 2403 CXXRecordDecl *AbstractClass; 2404 2405 bool VisitDeclContext(const DeclContext *DC) { 2406 bool Invalid = false; 2407 2408 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2409 E = DC->decls_end(); I != E; ++I) 2410 Invalid |= Visit(*I); 2411 2412 return Invalid; 2413 } 2414 2415 public: 2416 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2417 : SemaRef(SemaRef), AbstractClass(ac) { 2418 Visit(SemaRef.Context.getTranslationUnitDecl()); 2419 } 2420 2421 bool VisitFunctionDecl(const FunctionDecl *FD) { 2422 if (FD->isThisDeclarationADefinition()) { 2423 // No need to do the check if we're in a definition, because it requires 2424 // that the return/param types are complete. 2425 // because that requires 2426 return VisitDeclContext(FD); 2427 } 2428 2429 // Check the return type. 2430 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2431 bool Invalid = 2432 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2433 diag::err_abstract_type_in_decl, 2434 Sema::AbstractReturnType, 2435 AbstractClass); 2436 2437 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2438 E = FD->param_end(); I != E; ++I) { 2439 const ParmVarDecl *VD = *I; 2440 Invalid |= 2441 SemaRef.RequireNonAbstractType(VD->getLocation(), 2442 VD->getOriginalType(), 2443 diag::err_abstract_type_in_decl, 2444 Sema::AbstractParamType, 2445 AbstractClass); 2446 } 2447 2448 return Invalid; 2449 } 2450 2451 bool VisitDecl(const Decl* D) { 2452 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2453 return VisitDeclContext(DC); 2454 2455 return false; 2456 } 2457 }; 2458} 2459 2460/// \brief Perform semantic checks on a class definition that has been 2461/// completing, introducing implicitly-declared members, checking for 2462/// abstract types, etc. 2463void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2464 if (!Record || Record->isInvalidDecl()) 2465 return; 2466 2467 if (!Record->isDependentType()) 2468 AddImplicitlyDeclaredMembersToClass(Record); 2469 2470 if (Record->isInvalidDecl()) 2471 return; 2472 2473 // Set access bits correctly on the directly-declared conversions. 2474 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2475 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2476 Convs->setAccess(I, (*I)->getAccess()); 2477 2478 // Determine whether we need to check for final overriders. We do 2479 // this either when there are virtual base classes (in which case we 2480 // may end up finding multiple final overriders for a given virtual 2481 // function) or any of the base classes is abstract (in which case 2482 // we might detect that this class is abstract). 2483 bool CheckFinalOverriders = false; 2484 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2485 !Record->isDependentType()) { 2486 if (Record->getNumVBases()) 2487 CheckFinalOverriders = true; 2488 else if (!Record->isAbstract()) { 2489 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2490 BEnd = Record->bases_end(); 2491 B != BEnd; ++B) { 2492 CXXRecordDecl *BaseDecl 2493 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2494 if (BaseDecl->isAbstract()) { 2495 CheckFinalOverriders = true; 2496 break; 2497 } 2498 } 2499 } 2500 } 2501 2502 if (CheckFinalOverriders) { 2503 CXXFinalOverriderMap FinalOverriders; 2504 Record->getFinalOverriders(FinalOverriders); 2505 2506 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2507 MEnd = FinalOverriders.end(); 2508 M != MEnd; ++M) { 2509 for (OverridingMethods::iterator SO = M->second.begin(), 2510 SOEnd = M->second.end(); 2511 SO != SOEnd; ++SO) { 2512 assert(SO->second.size() > 0 && 2513 "All virtual functions have overridding virtual functions"); 2514 if (SO->second.size() == 1) { 2515 // C++ [class.abstract]p4: 2516 // A class is abstract if it contains or inherits at least one 2517 // pure virtual function for which the final overrider is pure 2518 // virtual. 2519 if (SO->second.front().Method->isPure()) 2520 Record->setAbstract(true); 2521 continue; 2522 } 2523 2524 // C++ [class.virtual]p2: 2525 // In a derived class, if a virtual member function of a base 2526 // class subobject has more than one final overrider the 2527 // program is ill-formed. 2528 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2529 << (NamedDecl *)M->first << Record; 2530 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2531 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2532 OMEnd = SO->second.end(); 2533 OM != OMEnd; ++OM) 2534 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2535 << (NamedDecl *)M->first << OM->Method->getParent(); 2536 2537 Record->setInvalidDecl(); 2538 } 2539 } 2540 } 2541 2542 if (Record->isAbstract() && !Record->isInvalidDecl()) 2543 (void)AbstractClassUsageDiagnoser(*this, Record); 2544 2545 // If this is not an aggregate type and has no user-declared constructor, 2546 // complain about any non-static data members of reference or const scalar 2547 // type, since they will never get initializers. 2548 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2549 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2550 bool Complained = false; 2551 for (RecordDecl::field_iterator F = Record->field_begin(), 2552 FEnd = Record->field_end(); 2553 F != FEnd; ++F) { 2554 if (F->getType()->isReferenceType() || 2555 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2556 if (!Complained) { 2557 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2558 << Record->getTagKind() << Record; 2559 Complained = true; 2560 } 2561 2562 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2563 << F->getType()->isReferenceType() 2564 << F->getDeclName(); 2565 } 2566 } 2567 } 2568 2569 if (Record->isDynamicClass()) 2570 DynamicClasses.push_back(Record); 2571} 2572 2573void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2574 DeclPtrTy TagDecl, 2575 SourceLocation LBrac, 2576 SourceLocation RBrac, 2577 AttributeList *AttrList) { 2578 if (!TagDecl) 2579 return; 2580 2581 AdjustDeclIfTemplate(TagDecl); 2582 2583 ActOnFields(S, RLoc, TagDecl, 2584 (DeclPtrTy*)FieldCollector->getCurFields(), 2585 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2586 2587 CheckCompletedCXXClass( 2588 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2589} 2590 2591namespace { 2592 /// \brief Helper class that collects exception specifications for 2593 /// implicitly-declared special member functions. 2594 class ImplicitExceptionSpecification { 2595 ASTContext &Context; 2596 bool AllowsAllExceptions; 2597 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2598 llvm::SmallVector<QualType, 4> Exceptions; 2599 2600 public: 2601 explicit ImplicitExceptionSpecification(ASTContext &Context) 2602 : Context(Context), AllowsAllExceptions(false) { } 2603 2604 /// \brief Whether the special member function should have any 2605 /// exception specification at all. 2606 bool hasExceptionSpecification() const { 2607 return !AllowsAllExceptions; 2608 } 2609 2610 /// \brief Whether the special member function should have a 2611 /// throw(...) exception specification (a Microsoft extension). 2612 bool hasAnyExceptionSpecification() const { 2613 return false; 2614 } 2615 2616 /// \brief The number of exceptions in the exception specification. 2617 unsigned size() const { return Exceptions.size(); } 2618 2619 /// \brief The set of exceptions in the exception specification. 2620 const QualType *data() const { return Exceptions.data(); } 2621 2622 /// \brief Note that 2623 void CalledDecl(CXXMethodDecl *Method) { 2624 // If we already know that we allow all exceptions, do nothing. 2625 if (AllowsAllExceptions || !Method) 2626 return; 2627 2628 const FunctionProtoType *Proto 2629 = Method->getType()->getAs<FunctionProtoType>(); 2630 2631 // If this function can throw any exceptions, make a note of that. 2632 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2633 AllowsAllExceptions = true; 2634 ExceptionsSeen.clear(); 2635 Exceptions.clear(); 2636 return; 2637 } 2638 2639 // Record the exceptions in this function's exception specification. 2640 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2641 EEnd = Proto->exception_end(); 2642 E != EEnd; ++E) 2643 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2644 Exceptions.push_back(*E); 2645 } 2646 }; 2647} 2648 2649 2650/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2651/// special functions, such as the default constructor, copy 2652/// constructor, or destructor, to the given C++ class (C++ 2653/// [special]p1). This routine can only be executed just before the 2654/// definition of the class is complete. 2655void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2656 if (!ClassDecl->hasUserDeclaredConstructor()) 2657 ++ASTContext::NumImplicitDefaultConstructors; 2658 2659 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2660 ++ASTContext::NumImplicitCopyConstructors; 2661 2662 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2663 ++ASTContext::NumImplicitCopyAssignmentOperators; 2664 2665 // If we have a dynamic class, then the copy assignment operator may be 2666 // virtual, so we have to declare it immediately. This ensures that, e.g., 2667 // it shows up in the right place in the vtable and that we diagnose 2668 // problems with the implicit exception specification. 2669 if (ClassDecl->isDynamicClass()) 2670 DeclareImplicitCopyAssignment(ClassDecl); 2671 } 2672 2673 if (!ClassDecl->hasUserDeclaredDestructor()) { 2674 ++ASTContext::NumImplicitDestructors; 2675 2676 // If we have a dynamic class, then the destructor may be virtual, so we 2677 // have to declare the destructor immediately. This ensures that, e.g., it 2678 // shows up in the right place in the vtable and that we diagnose problems 2679 // with the implicit exception specification. 2680 if (ClassDecl->isDynamicClass()) 2681 DeclareImplicitDestructor(ClassDecl); 2682 } 2683} 2684 2685void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2686 Decl *D = TemplateD.getAs<Decl>(); 2687 if (!D) 2688 return; 2689 2690 TemplateParameterList *Params = 0; 2691 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2692 Params = Template->getTemplateParameters(); 2693 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2694 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2695 Params = PartialSpec->getTemplateParameters(); 2696 else 2697 return; 2698 2699 for (TemplateParameterList::iterator Param = Params->begin(), 2700 ParamEnd = Params->end(); 2701 Param != ParamEnd; ++Param) { 2702 NamedDecl *Named = cast<NamedDecl>(*Param); 2703 if (Named->getDeclName()) { 2704 S->AddDecl(DeclPtrTy::make(Named)); 2705 IdResolver.AddDecl(Named); 2706 } 2707 } 2708} 2709 2710void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2711 if (!RecordD) return; 2712 AdjustDeclIfTemplate(RecordD); 2713 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2714 PushDeclContext(S, Record); 2715} 2716 2717void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2718 if (!RecordD) return; 2719 PopDeclContext(); 2720} 2721 2722/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2723/// parsing a top-level (non-nested) C++ class, and we are now 2724/// parsing those parts of the given Method declaration that could 2725/// not be parsed earlier (C++ [class.mem]p2), such as default 2726/// arguments. This action should enter the scope of the given 2727/// Method declaration as if we had just parsed the qualified method 2728/// name. However, it should not bring the parameters into scope; 2729/// that will be performed by ActOnDelayedCXXMethodParameter. 2730void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2731} 2732 2733/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2734/// C++ method declaration. We're (re-)introducing the given 2735/// function parameter into scope for use in parsing later parts of 2736/// the method declaration. For example, we could see an 2737/// ActOnParamDefaultArgument event for this parameter. 2738void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2739 if (!ParamD) 2740 return; 2741 2742 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2743 2744 // If this parameter has an unparsed default argument, clear it out 2745 // to make way for the parsed default argument. 2746 if (Param->hasUnparsedDefaultArg()) 2747 Param->setDefaultArg(0); 2748 2749 S->AddDecl(DeclPtrTy::make(Param)); 2750 if (Param->getDeclName()) 2751 IdResolver.AddDecl(Param); 2752} 2753 2754/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2755/// processing the delayed method declaration for Method. The method 2756/// declaration is now considered finished. There may be a separate 2757/// ActOnStartOfFunctionDef action later (not necessarily 2758/// immediately!) for this method, if it was also defined inside the 2759/// class body. 2760void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2761 if (!MethodD) 2762 return; 2763 2764 AdjustDeclIfTemplate(MethodD); 2765 2766 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2767 2768 // Now that we have our default arguments, check the constructor 2769 // again. It could produce additional diagnostics or affect whether 2770 // the class has implicitly-declared destructors, among other 2771 // things. 2772 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2773 CheckConstructor(Constructor); 2774 2775 // Check the default arguments, which we may have added. 2776 if (!Method->isInvalidDecl()) 2777 CheckCXXDefaultArguments(Method); 2778} 2779 2780/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2781/// the well-formedness of the constructor declarator @p D with type @p 2782/// R. If there are any errors in the declarator, this routine will 2783/// emit diagnostics and set the invalid bit to true. In any case, the type 2784/// will be updated to reflect a well-formed type for the constructor and 2785/// returned. 2786QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2787 FunctionDecl::StorageClass &SC) { 2788 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2789 2790 // C++ [class.ctor]p3: 2791 // A constructor shall not be virtual (10.3) or static (9.4). A 2792 // constructor can be invoked for a const, volatile or const 2793 // volatile object. A constructor shall not be declared const, 2794 // volatile, or const volatile (9.3.2). 2795 if (isVirtual) { 2796 if (!D.isInvalidType()) 2797 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2798 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2799 << SourceRange(D.getIdentifierLoc()); 2800 D.setInvalidType(); 2801 } 2802 if (SC == FunctionDecl::Static) { 2803 if (!D.isInvalidType()) 2804 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2805 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2806 << SourceRange(D.getIdentifierLoc()); 2807 D.setInvalidType(); 2808 SC = FunctionDecl::None; 2809 } 2810 2811 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2812 if (FTI.TypeQuals != 0) { 2813 if (FTI.TypeQuals & Qualifiers::Const) 2814 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2815 << "const" << SourceRange(D.getIdentifierLoc()); 2816 if (FTI.TypeQuals & Qualifiers::Volatile) 2817 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2818 << "volatile" << SourceRange(D.getIdentifierLoc()); 2819 if (FTI.TypeQuals & Qualifiers::Restrict) 2820 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2821 << "restrict" << SourceRange(D.getIdentifierLoc()); 2822 } 2823 2824 // Rebuild the function type "R" without any type qualifiers (in 2825 // case any of the errors above fired) and with "void" as the 2826 // return type, since constructors don't have return types. 2827 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2828 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2829 Proto->getNumArgs(), 2830 Proto->isVariadic(), 0, 2831 Proto->hasExceptionSpec(), 2832 Proto->hasAnyExceptionSpec(), 2833 Proto->getNumExceptions(), 2834 Proto->exception_begin(), 2835 Proto->getExtInfo()); 2836} 2837 2838/// CheckConstructor - Checks a fully-formed constructor for 2839/// well-formedness, issuing any diagnostics required. Returns true if 2840/// the constructor declarator is invalid. 2841void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2842 CXXRecordDecl *ClassDecl 2843 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2844 if (!ClassDecl) 2845 return Constructor->setInvalidDecl(); 2846 2847 // C++ [class.copy]p3: 2848 // A declaration of a constructor for a class X is ill-formed if 2849 // its first parameter is of type (optionally cv-qualified) X and 2850 // either there are no other parameters or else all other 2851 // parameters have default arguments. 2852 if (!Constructor->isInvalidDecl() && 2853 ((Constructor->getNumParams() == 1) || 2854 (Constructor->getNumParams() > 1 && 2855 Constructor->getParamDecl(1)->hasDefaultArg())) && 2856 Constructor->getTemplateSpecializationKind() 2857 != TSK_ImplicitInstantiation) { 2858 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2859 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2860 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2861 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2862 const char *ConstRef 2863 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2864 : " const &"; 2865 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2866 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 2867 2868 // FIXME: Rather that making the constructor invalid, we should endeavor 2869 // to fix the type. 2870 Constructor->setInvalidDecl(); 2871 } 2872 } 2873 2874 // Notify the class that we've added a constructor. In principle we 2875 // don't need to do this for out-of-line declarations; in practice 2876 // we only instantiate the most recent declaration of a method, so 2877 // we have to call this for everything but friends. 2878 if (!Constructor->getFriendObjectKind()) 2879 ClassDecl->addedConstructor(Context, Constructor); 2880} 2881 2882/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2883/// issuing any diagnostics required. Returns true on error. 2884bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2885 CXXRecordDecl *RD = Destructor->getParent(); 2886 2887 if (Destructor->isVirtual()) { 2888 SourceLocation Loc; 2889 2890 if (!Destructor->isImplicit()) 2891 Loc = Destructor->getLocation(); 2892 else 2893 Loc = RD->getLocation(); 2894 2895 // If we have a virtual destructor, look up the deallocation function 2896 FunctionDecl *OperatorDelete = 0; 2897 DeclarationName Name = 2898 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2899 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2900 return true; 2901 2902 Destructor->setOperatorDelete(OperatorDelete); 2903 } 2904 2905 return false; 2906} 2907 2908static inline bool 2909FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2910 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2911 FTI.ArgInfo[0].Param && 2912 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2913} 2914 2915/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2916/// the well-formednes of the destructor declarator @p D with type @p 2917/// R. If there are any errors in the declarator, this routine will 2918/// emit diagnostics and set the declarator to invalid. Even if this happens, 2919/// will be updated to reflect a well-formed type for the destructor and 2920/// returned. 2921QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 2922 FunctionDecl::StorageClass& SC) { 2923 // C++ [class.dtor]p1: 2924 // [...] A typedef-name that names a class is a class-name 2925 // (7.1.3); however, a typedef-name that names a class shall not 2926 // be used as the identifier in the declarator for a destructor 2927 // declaration. 2928 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2929 if (isa<TypedefType>(DeclaratorType)) 2930 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2931 << DeclaratorType; 2932 2933 // C++ [class.dtor]p2: 2934 // A destructor is used to destroy objects of its class type. A 2935 // destructor takes no parameters, and no return type can be 2936 // specified for it (not even void). The address of a destructor 2937 // shall not be taken. A destructor shall not be static. A 2938 // destructor can be invoked for a const, volatile or const 2939 // volatile object. A destructor shall not be declared const, 2940 // volatile or const volatile (9.3.2). 2941 if (SC == FunctionDecl::Static) { 2942 if (!D.isInvalidType()) 2943 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2944 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2945 << SourceRange(D.getIdentifierLoc()) 2946 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2947 2948 SC = FunctionDecl::None; 2949 } 2950 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2951 // Destructors don't have return types, but the parser will 2952 // happily parse something like: 2953 // 2954 // class X { 2955 // float ~X(); 2956 // }; 2957 // 2958 // The return type will be eliminated later. 2959 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2960 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2961 << SourceRange(D.getIdentifierLoc()); 2962 } 2963 2964 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2965 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2966 if (FTI.TypeQuals & Qualifiers::Const) 2967 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2968 << "const" << SourceRange(D.getIdentifierLoc()); 2969 if (FTI.TypeQuals & Qualifiers::Volatile) 2970 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2971 << "volatile" << SourceRange(D.getIdentifierLoc()); 2972 if (FTI.TypeQuals & Qualifiers::Restrict) 2973 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2974 << "restrict" << SourceRange(D.getIdentifierLoc()); 2975 D.setInvalidType(); 2976 } 2977 2978 // Make sure we don't have any parameters. 2979 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2980 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2981 2982 // Delete the parameters. 2983 FTI.freeArgs(); 2984 D.setInvalidType(); 2985 } 2986 2987 // Make sure the destructor isn't variadic. 2988 if (FTI.isVariadic) { 2989 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2990 D.setInvalidType(); 2991 } 2992 2993 // Rebuild the function type "R" without any type qualifiers or 2994 // parameters (in case any of the errors above fired) and with 2995 // "void" as the return type, since destructors don't have return 2996 // types. 2997 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2998 if (!Proto) 2999 return QualType(); 3000 3001 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3002 Proto->hasExceptionSpec(), 3003 Proto->hasAnyExceptionSpec(), 3004 Proto->getNumExceptions(), 3005 Proto->exception_begin(), 3006 Proto->getExtInfo()); 3007} 3008 3009/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3010/// well-formednes of the conversion function declarator @p D with 3011/// type @p R. If there are any errors in the declarator, this routine 3012/// will emit diagnostics and return true. Otherwise, it will return 3013/// false. Either way, the type @p R will be updated to reflect a 3014/// well-formed type for the conversion operator. 3015void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3016 FunctionDecl::StorageClass& SC) { 3017 // C++ [class.conv.fct]p1: 3018 // Neither parameter types nor return type can be specified. The 3019 // type of a conversion function (8.3.5) is "function taking no 3020 // parameter returning conversion-type-id." 3021 if (SC == FunctionDecl::Static) { 3022 if (!D.isInvalidType()) 3023 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3024 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3025 << SourceRange(D.getIdentifierLoc()); 3026 D.setInvalidType(); 3027 SC = FunctionDecl::None; 3028 } 3029 3030 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3031 3032 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3033 // Conversion functions don't have return types, but the parser will 3034 // happily parse something like: 3035 // 3036 // class X { 3037 // float operator bool(); 3038 // }; 3039 // 3040 // The return type will be changed later anyway. 3041 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3042 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3043 << SourceRange(D.getIdentifierLoc()); 3044 D.setInvalidType(); 3045 } 3046 3047 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3048 3049 // Make sure we don't have any parameters. 3050 if (Proto->getNumArgs() > 0) { 3051 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3052 3053 // Delete the parameters. 3054 D.getTypeObject(0).Fun.freeArgs(); 3055 D.setInvalidType(); 3056 } else if (Proto->isVariadic()) { 3057 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3058 D.setInvalidType(); 3059 } 3060 3061 // Diagnose "&operator bool()" and other such nonsense. This 3062 // is actually a gcc extension which we don't support. 3063 if (Proto->getResultType() != ConvType) { 3064 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3065 << Proto->getResultType(); 3066 D.setInvalidType(); 3067 ConvType = Proto->getResultType(); 3068 } 3069 3070 // C++ [class.conv.fct]p4: 3071 // The conversion-type-id shall not represent a function type nor 3072 // an array type. 3073 if (ConvType->isArrayType()) { 3074 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3075 ConvType = Context.getPointerType(ConvType); 3076 D.setInvalidType(); 3077 } else if (ConvType->isFunctionType()) { 3078 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3079 ConvType = Context.getPointerType(ConvType); 3080 D.setInvalidType(); 3081 } 3082 3083 // Rebuild the function type "R" without any parameters (in case any 3084 // of the errors above fired) and with the conversion type as the 3085 // return type. 3086 if (D.isInvalidType()) { 3087 R = Context.getFunctionType(ConvType, 0, 0, false, 3088 Proto->getTypeQuals(), 3089 Proto->hasExceptionSpec(), 3090 Proto->hasAnyExceptionSpec(), 3091 Proto->getNumExceptions(), 3092 Proto->exception_begin(), 3093 Proto->getExtInfo()); 3094 } 3095 3096 // C++0x explicit conversion operators. 3097 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3098 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3099 diag::warn_explicit_conversion_functions) 3100 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3101} 3102 3103/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3104/// the declaration of the given C++ conversion function. This routine 3105/// is responsible for recording the conversion function in the C++ 3106/// class, if possible. 3107Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3108 assert(Conversion && "Expected to receive a conversion function declaration"); 3109 3110 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3111 3112 // Make sure we aren't redeclaring the conversion function. 3113 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3114 3115 // C++ [class.conv.fct]p1: 3116 // [...] A conversion function is never used to convert a 3117 // (possibly cv-qualified) object to the (possibly cv-qualified) 3118 // same object type (or a reference to it), to a (possibly 3119 // cv-qualified) base class of that type (or a reference to it), 3120 // or to (possibly cv-qualified) void. 3121 // FIXME: Suppress this warning if the conversion function ends up being a 3122 // virtual function that overrides a virtual function in a base class. 3123 QualType ClassType 3124 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3125 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3126 ConvType = ConvTypeRef->getPointeeType(); 3127 if (ConvType->isRecordType()) { 3128 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3129 if (ConvType == ClassType) 3130 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3131 << ClassType; 3132 else if (IsDerivedFrom(ClassType, ConvType)) 3133 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3134 << ClassType << ConvType; 3135 } else if (ConvType->isVoidType()) { 3136 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3137 << ClassType << ConvType; 3138 } 3139 3140 if (Conversion->getPrimaryTemplate()) { 3141 // ignore specializations 3142 } else if (Conversion->getPreviousDeclaration()) { 3143 if (FunctionTemplateDecl *ConversionTemplate 3144 = Conversion->getDescribedFunctionTemplate()) { 3145 if (ClassDecl->replaceConversion( 3146 ConversionTemplate->getPreviousDeclaration(), 3147 ConversionTemplate)) 3148 return DeclPtrTy::make(ConversionTemplate); 3149 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3150 Conversion)) 3151 return DeclPtrTy::make(Conversion); 3152 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3153 } else if (FunctionTemplateDecl *ConversionTemplate 3154 = Conversion->getDescribedFunctionTemplate()) 3155 ClassDecl->addConversionFunction(ConversionTemplate); 3156 else 3157 ClassDecl->addConversionFunction(Conversion); 3158 3159 return DeclPtrTy::make(Conversion); 3160} 3161 3162//===----------------------------------------------------------------------===// 3163// Namespace Handling 3164//===----------------------------------------------------------------------===// 3165 3166/// ActOnStartNamespaceDef - This is called at the start of a namespace 3167/// definition. 3168Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3169 SourceLocation IdentLoc, 3170 IdentifierInfo *II, 3171 SourceLocation LBrace, 3172 AttributeList *AttrList) { 3173 NamespaceDecl *Namespc = 3174 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3175 Namespc->setLBracLoc(LBrace); 3176 3177 Scope *DeclRegionScope = NamespcScope->getParent(); 3178 3179 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3180 3181 if (II) { 3182 // C++ [namespace.def]p2: 3183 // The identifier in an original-namespace-definition shall not have been 3184 // previously defined in the declarative region in which the 3185 // original-namespace-definition appears. The identifier in an 3186 // original-namespace-definition is the name of the namespace. Subsequently 3187 // in that declarative region, it is treated as an original-namespace-name. 3188 3189 NamedDecl *PrevDecl 3190 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3191 ForRedeclaration); 3192 3193 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3194 // This is an extended namespace definition. 3195 // Attach this namespace decl to the chain of extended namespace 3196 // definitions. 3197 OrigNS->setNextNamespace(Namespc); 3198 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3199 3200 // Remove the previous declaration from the scope. 3201 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3202 IdResolver.RemoveDecl(OrigNS); 3203 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3204 } 3205 } else if (PrevDecl) { 3206 // This is an invalid name redefinition. 3207 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3208 << Namespc->getDeclName(); 3209 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3210 Namespc->setInvalidDecl(); 3211 // Continue on to push Namespc as current DeclContext and return it. 3212 } else if (II->isStr("std") && 3213 CurContext->getLookupContext()->isTranslationUnit()) { 3214 // This is the first "real" definition of the namespace "std", so update 3215 // our cache of the "std" namespace to point at this definition. 3216 if (StdNamespace) { 3217 // We had already defined a dummy namespace "std". Link this new 3218 // namespace definition to the dummy namespace "std". 3219 StdNamespace->setNextNamespace(Namespc); 3220 StdNamespace->setLocation(IdentLoc); 3221 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3222 } 3223 3224 // Make our StdNamespace cache point at the first real definition of the 3225 // "std" namespace. 3226 StdNamespace = Namespc; 3227 } 3228 3229 PushOnScopeChains(Namespc, DeclRegionScope); 3230 } else { 3231 // Anonymous namespaces. 3232 assert(Namespc->isAnonymousNamespace()); 3233 3234 // Link the anonymous namespace into its parent. 3235 NamespaceDecl *PrevDecl; 3236 DeclContext *Parent = CurContext->getLookupContext(); 3237 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3238 PrevDecl = TU->getAnonymousNamespace(); 3239 TU->setAnonymousNamespace(Namespc); 3240 } else { 3241 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3242 PrevDecl = ND->getAnonymousNamespace(); 3243 ND->setAnonymousNamespace(Namespc); 3244 } 3245 3246 // Link the anonymous namespace with its previous declaration. 3247 if (PrevDecl) { 3248 assert(PrevDecl->isAnonymousNamespace()); 3249 assert(!PrevDecl->getNextNamespace()); 3250 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3251 PrevDecl->setNextNamespace(Namespc); 3252 } 3253 3254 CurContext->addDecl(Namespc); 3255 3256 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3257 // behaves as if it were replaced by 3258 // namespace unique { /* empty body */ } 3259 // using namespace unique; 3260 // namespace unique { namespace-body } 3261 // where all occurrences of 'unique' in a translation unit are 3262 // replaced by the same identifier and this identifier differs 3263 // from all other identifiers in the entire program. 3264 3265 // We just create the namespace with an empty name and then add an 3266 // implicit using declaration, just like the standard suggests. 3267 // 3268 // CodeGen enforces the "universally unique" aspect by giving all 3269 // declarations semantically contained within an anonymous 3270 // namespace internal linkage. 3271 3272 if (!PrevDecl) { 3273 UsingDirectiveDecl* UD 3274 = UsingDirectiveDecl::Create(Context, CurContext, 3275 /* 'using' */ LBrace, 3276 /* 'namespace' */ SourceLocation(), 3277 /* qualifier */ SourceRange(), 3278 /* NNS */ NULL, 3279 /* identifier */ SourceLocation(), 3280 Namespc, 3281 /* Ancestor */ CurContext); 3282 UD->setImplicit(); 3283 CurContext->addDecl(UD); 3284 } 3285 } 3286 3287 // Although we could have an invalid decl (i.e. the namespace name is a 3288 // redefinition), push it as current DeclContext and try to continue parsing. 3289 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3290 // for the namespace has the declarations that showed up in that particular 3291 // namespace definition. 3292 PushDeclContext(NamespcScope, Namespc); 3293 return DeclPtrTy::make(Namespc); 3294} 3295 3296/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3297/// is a namespace alias, returns the namespace it points to. 3298static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3299 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3300 return AD->getNamespace(); 3301 return dyn_cast_or_null<NamespaceDecl>(D); 3302} 3303 3304/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3305/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3306void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3307 Decl *Dcl = D.getAs<Decl>(); 3308 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3309 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3310 Namespc->setRBracLoc(RBrace); 3311 PopDeclContext(); 3312} 3313 3314/// \brief Retrieve the special "std" namespace, which may require us to 3315/// implicitly define the namespace. 3316NamespaceDecl *Sema::getStdNamespace() { 3317 if (!StdNamespace) { 3318 // The "std" namespace has not yet been defined, so build one implicitly. 3319 StdNamespace = NamespaceDecl::Create(Context, 3320 Context.getTranslationUnitDecl(), 3321 SourceLocation(), 3322 &PP.getIdentifierTable().get("std")); 3323 StdNamespace->setImplicit(true); 3324 } 3325 3326 return StdNamespace; 3327} 3328 3329Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3330 SourceLocation UsingLoc, 3331 SourceLocation NamespcLoc, 3332 CXXScopeSpec &SS, 3333 SourceLocation IdentLoc, 3334 IdentifierInfo *NamespcName, 3335 AttributeList *AttrList) { 3336 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3337 assert(NamespcName && "Invalid NamespcName."); 3338 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3339 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3340 3341 UsingDirectiveDecl *UDir = 0; 3342 NestedNameSpecifier *Qualifier = 0; 3343 if (SS.isSet()) 3344 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3345 3346 // Lookup namespace name. 3347 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3348 LookupParsedName(R, S, &SS); 3349 if (R.isAmbiguous()) 3350 return DeclPtrTy(); 3351 3352 if (R.empty()) { 3353 // Allow "using namespace std;" or "using namespace ::std;" even if 3354 // "std" hasn't been defined yet, for GCC compatibility. 3355 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3356 NamespcName->isStr("std")) { 3357 Diag(IdentLoc, diag::ext_using_undefined_std); 3358 R.addDecl(getStdNamespace()); 3359 R.resolveKind(); 3360 } 3361 // Otherwise, attempt typo correction. 3362 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3363 CTC_NoKeywords, 0)) { 3364 if (R.getAsSingle<NamespaceDecl>() || 3365 R.getAsSingle<NamespaceAliasDecl>()) { 3366 if (DeclContext *DC = computeDeclContext(SS, false)) 3367 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3368 << NamespcName << DC << Corrected << SS.getRange() 3369 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3370 else 3371 Diag(IdentLoc, diag::err_using_directive_suggest) 3372 << NamespcName << Corrected 3373 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3374 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3375 << Corrected; 3376 3377 NamespcName = Corrected.getAsIdentifierInfo(); 3378 } else { 3379 R.clear(); 3380 R.setLookupName(NamespcName); 3381 } 3382 } 3383 } 3384 3385 if (!R.empty()) { 3386 NamedDecl *Named = R.getFoundDecl(); 3387 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3388 && "expected namespace decl"); 3389 // C++ [namespace.udir]p1: 3390 // A using-directive specifies that the names in the nominated 3391 // namespace can be used in the scope in which the 3392 // using-directive appears after the using-directive. During 3393 // unqualified name lookup (3.4.1), the names appear as if they 3394 // were declared in the nearest enclosing namespace which 3395 // contains both the using-directive and the nominated 3396 // namespace. [Note: in this context, "contains" means "contains 3397 // directly or indirectly". ] 3398 3399 // Find enclosing context containing both using-directive and 3400 // nominated namespace. 3401 NamespaceDecl *NS = getNamespaceDecl(Named); 3402 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3403 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3404 CommonAncestor = CommonAncestor->getParent(); 3405 3406 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3407 SS.getRange(), 3408 (NestedNameSpecifier *)SS.getScopeRep(), 3409 IdentLoc, Named, CommonAncestor); 3410 PushUsingDirective(S, UDir); 3411 } else { 3412 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3413 } 3414 3415 // FIXME: We ignore attributes for now. 3416 delete AttrList; 3417 return DeclPtrTy::make(UDir); 3418} 3419 3420void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3421 // If scope has associated entity, then using directive is at namespace 3422 // or translation unit scope. We add UsingDirectiveDecls, into 3423 // it's lookup structure. 3424 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3425 Ctx->addDecl(UDir); 3426 else 3427 // Otherwise it is block-sope. using-directives will affect lookup 3428 // only to the end of scope. 3429 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3430} 3431 3432 3433Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3434 AccessSpecifier AS, 3435 bool HasUsingKeyword, 3436 SourceLocation UsingLoc, 3437 CXXScopeSpec &SS, 3438 UnqualifiedId &Name, 3439 AttributeList *AttrList, 3440 bool IsTypeName, 3441 SourceLocation TypenameLoc) { 3442 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3443 3444 switch (Name.getKind()) { 3445 case UnqualifiedId::IK_Identifier: 3446 case UnqualifiedId::IK_OperatorFunctionId: 3447 case UnqualifiedId::IK_LiteralOperatorId: 3448 case UnqualifiedId::IK_ConversionFunctionId: 3449 break; 3450 3451 case UnqualifiedId::IK_ConstructorName: 3452 case UnqualifiedId::IK_ConstructorTemplateId: 3453 // C++0x inherited constructors. 3454 if (getLangOptions().CPlusPlus0x) break; 3455 3456 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3457 << SS.getRange(); 3458 return DeclPtrTy(); 3459 3460 case UnqualifiedId::IK_DestructorName: 3461 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3462 << SS.getRange(); 3463 return DeclPtrTy(); 3464 3465 case UnqualifiedId::IK_TemplateId: 3466 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3467 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3468 return DeclPtrTy(); 3469 } 3470 3471 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3472 if (!TargetName) 3473 return DeclPtrTy(); 3474 3475 // Warn about using declarations. 3476 // TODO: store that the declaration was written without 'using' and 3477 // talk about access decls instead of using decls in the 3478 // diagnostics. 3479 if (!HasUsingKeyword) { 3480 UsingLoc = Name.getSourceRange().getBegin(); 3481 3482 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3483 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3484 } 3485 3486 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3487 Name.getSourceRange().getBegin(), 3488 TargetName, AttrList, 3489 /* IsInstantiation */ false, 3490 IsTypeName, TypenameLoc); 3491 if (UD) 3492 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3493 3494 return DeclPtrTy::make(UD); 3495} 3496 3497/// Determines whether to create a using shadow decl for a particular 3498/// decl, given the set of decls existing prior to this using lookup. 3499bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3500 const LookupResult &Previous) { 3501 // Diagnose finding a decl which is not from a base class of the 3502 // current class. We do this now because there are cases where this 3503 // function will silently decide not to build a shadow decl, which 3504 // will pre-empt further diagnostics. 3505 // 3506 // We don't need to do this in C++0x because we do the check once on 3507 // the qualifier. 3508 // 3509 // FIXME: diagnose the following if we care enough: 3510 // struct A { int foo; }; 3511 // struct B : A { using A::foo; }; 3512 // template <class T> struct C : A {}; 3513 // template <class T> struct D : C<T> { using B::foo; } // <--- 3514 // This is invalid (during instantiation) in C++03 because B::foo 3515 // resolves to the using decl in B, which is not a base class of D<T>. 3516 // We can't diagnose it immediately because C<T> is an unknown 3517 // specialization. The UsingShadowDecl in D<T> then points directly 3518 // to A::foo, which will look well-formed when we instantiate. 3519 // The right solution is to not collapse the shadow-decl chain. 3520 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3521 DeclContext *OrigDC = Orig->getDeclContext(); 3522 3523 // Handle enums and anonymous structs. 3524 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3525 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3526 while (OrigRec->isAnonymousStructOrUnion()) 3527 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3528 3529 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3530 if (OrigDC == CurContext) { 3531 Diag(Using->getLocation(), 3532 diag::err_using_decl_nested_name_specifier_is_current_class) 3533 << Using->getNestedNameRange(); 3534 Diag(Orig->getLocation(), diag::note_using_decl_target); 3535 return true; 3536 } 3537 3538 Diag(Using->getNestedNameRange().getBegin(), 3539 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3540 << Using->getTargetNestedNameDecl() 3541 << cast<CXXRecordDecl>(CurContext) 3542 << Using->getNestedNameRange(); 3543 Diag(Orig->getLocation(), diag::note_using_decl_target); 3544 return true; 3545 } 3546 } 3547 3548 if (Previous.empty()) return false; 3549 3550 NamedDecl *Target = Orig; 3551 if (isa<UsingShadowDecl>(Target)) 3552 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3553 3554 // If the target happens to be one of the previous declarations, we 3555 // don't have a conflict. 3556 // 3557 // FIXME: but we might be increasing its access, in which case we 3558 // should redeclare it. 3559 NamedDecl *NonTag = 0, *Tag = 0; 3560 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3561 I != E; ++I) { 3562 NamedDecl *D = (*I)->getUnderlyingDecl(); 3563 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3564 return false; 3565 3566 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3567 } 3568 3569 if (Target->isFunctionOrFunctionTemplate()) { 3570 FunctionDecl *FD; 3571 if (isa<FunctionTemplateDecl>(Target)) 3572 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3573 else 3574 FD = cast<FunctionDecl>(Target); 3575 3576 NamedDecl *OldDecl = 0; 3577 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3578 case Ovl_Overload: 3579 return false; 3580 3581 case Ovl_NonFunction: 3582 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3583 break; 3584 3585 // We found a decl with the exact signature. 3586 case Ovl_Match: 3587 // If we're in a record, we want to hide the target, so we 3588 // return true (without a diagnostic) to tell the caller not to 3589 // build a shadow decl. 3590 if (CurContext->isRecord()) 3591 return true; 3592 3593 // If we're not in a record, this is an error. 3594 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3595 break; 3596 } 3597 3598 Diag(Target->getLocation(), diag::note_using_decl_target); 3599 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3600 return true; 3601 } 3602 3603 // Target is not a function. 3604 3605 if (isa<TagDecl>(Target)) { 3606 // No conflict between a tag and a non-tag. 3607 if (!Tag) return false; 3608 3609 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3610 Diag(Target->getLocation(), diag::note_using_decl_target); 3611 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3612 return true; 3613 } 3614 3615 // No conflict between a tag and a non-tag. 3616 if (!NonTag) return false; 3617 3618 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3619 Diag(Target->getLocation(), diag::note_using_decl_target); 3620 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3621 return true; 3622} 3623 3624/// Builds a shadow declaration corresponding to a 'using' declaration. 3625UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3626 UsingDecl *UD, 3627 NamedDecl *Orig) { 3628 3629 // If we resolved to another shadow declaration, just coalesce them. 3630 NamedDecl *Target = Orig; 3631 if (isa<UsingShadowDecl>(Target)) { 3632 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3633 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3634 } 3635 3636 UsingShadowDecl *Shadow 3637 = UsingShadowDecl::Create(Context, CurContext, 3638 UD->getLocation(), UD, Target); 3639 UD->addShadowDecl(Shadow); 3640 3641 if (S) 3642 PushOnScopeChains(Shadow, S); 3643 else 3644 CurContext->addDecl(Shadow); 3645 Shadow->setAccess(UD->getAccess()); 3646 3647 // Register it as a conversion if appropriate. 3648 if (Shadow->getDeclName().getNameKind() 3649 == DeclarationName::CXXConversionFunctionName) 3650 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3651 3652 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3653 Shadow->setInvalidDecl(); 3654 3655 return Shadow; 3656} 3657 3658/// Hides a using shadow declaration. This is required by the current 3659/// using-decl implementation when a resolvable using declaration in a 3660/// class is followed by a declaration which would hide or override 3661/// one or more of the using decl's targets; for example: 3662/// 3663/// struct Base { void foo(int); }; 3664/// struct Derived : Base { 3665/// using Base::foo; 3666/// void foo(int); 3667/// }; 3668/// 3669/// The governing language is C++03 [namespace.udecl]p12: 3670/// 3671/// When a using-declaration brings names from a base class into a 3672/// derived class scope, member functions in the derived class 3673/// override and/or hide member functions with the same name and 3674/// parameter types in a base class (rather than conflicting). 3675/// 3676/// There are two ways to implement this: 3677/// (1) optimistically create shadow decls when they're not hidden 3678/// by existing declarations, or 3679/// (2) don't create any shadow decls (or at least don't make them 3680/// visible) until we've fully parsed/instantiated the class. 3681/// The problem with (1) is that we might have to retroactively remove 3682/// a shadow decl, which requires several O(n) operations because the 3683/// decl structures are (very reasonably) not designed for removal. 3684/// (2) avoids this but is very fiddly and phase-dependent. 3685void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3686 if (Shadow->getDeclName().getNameKind() == 3687 DeclarationName::CXXConversionFunctionName) 3688 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3689 3690 // Remove it from the DeclContext... 3691 Shadow->getDeclContext()->removeDecl(Shadow); 3692 3693 // ...and the scope, if applicable... 3694 if (S) { 3695 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3696 IdResolver.RemoveDecl(Shadow); 3697 } 3698 3699 // ...and the using decl. 3700 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3701 3702 // TODO: complain somehow if Shadow was used. It shouldn't 3703 // be possible for this to happen, because...? 3704} 3705 3706/// Builds a using declaration. 3707/// 3708/// \param IsInstantiation - Whether this call arises from an 3709/// instantiation of an unresolved using declaration. We treat 3710/// the lookup differently for these declarations. 3711NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3712 SourceLocation UsingLoc, 3713 CXXScopeSpec &SS, 3714 SourceLocation IdentLoc, 3715 DeclarationName Name, 3716 AttributeList *AttrList, 3717 bool IsInstantiation, 3718 bool IsTypeName, 3719 SourceLocation TypenameLoc) { 3720 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3721 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3722 3723 // FIXME: We ignore attributes for now. 3724 delete AttrList; 3725 3726 if (SS.isEmpty()) { 3727 Diag(IdentLoc, diag::err_using_requires_qualname); 3728 return 0; 3729 } 3730 3731 // Do the redeclaration lookup in the current scope. 3732 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3733 ForRedeclaration); 3734 Previous.setHideTags(false); 3735 if (S) { 3736 LookupName(Previous, S); 3737 3738 // It is really dumb that we have to do this. 3739 LookupResult::Filter F = Previous.makeFilter(); 3740 while (F.hasNext()) { 3741 NamedDecl *D = F.next(); 3742 if (!isDeclInScope(D, CurContext, S)) 3743 F.erase(); 3744 } 3745 F.done(); 3746 } else { 3747 assert(IsInstantiation && "no scope in non-instantiation"); 3748 assert(CurContext->isRecord() && "scope not record in instantiation"); 3749 LookupQualifiedName(Previous, CurContext); 3750 } 3751 3752 NestedNameSpecifier *NNS = 3753 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3754 3755 // Check for invalid redeclarations. 3756 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3757 return 0; 3758 3759 // Check for bad qualifiers. 3760 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3761 return 0; 3762 3763 DeclContext *LookupContext = computeDeclContext(SS); 3764 NamedDecl *D; 3765 if (!LookupContext) { 3766 if (IsTypeName) { 3767 // FIXME: not all declaration name kinds are legal here 3768 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3769 UsingLoc, TypenameLoc, 3770 SS.getRange(), NNS, 3771 IdentLoc, Name); 3772 } else { 3773 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3774 UsingLoc, SS.getRange(), NNS, 3775 IdentLoc, Name); 3776 } 3777 } else { 3778 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3779 SS.getRange(), UsingLoc, NNS, Name, 3780 IsTypeName); 3781 } 3782 D->setAccess(AS); 3783 CurContext->addDecl(D); 3784 3785 if (!LookupContext) return D; 3786 UsingDecl *UD = cast<UsingDecl>(D); 3787 3788 if (RequireCompleteDeclContext(SS, LookupContext)) { 3789 UD->setInvalidDecl(); 3790 return UD; 3791 } 3792 3793 // Look up the target name. 3794 3795 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3796 3797 // Unlike most lookups, we don't always want to hide tag 3798 // declarations: tag names are visible through the using declaration 3799 // even if hidden by ordinary names, *except* in a dependent context 3800 // where it's important for the sanity of two-phase lookup. 3801 if (!IsInstantiation) 3802 R.setHideTags(false); 3803 3804 LookupQualifiedName(R, LookupContext); 3805 3806 if (R.empty()) { 3807 Diag(IdentLoc, diag::err_no_member) 3808 << Name << LookupContext << SS.getRange(); 3809 UD->setInvalidDecl(); 3810 return UD; 3811 } 3812 3813 if (R.isAmbiguous()) { 3814 UD->setInvalidDecl(); 3815 return UD; 3816 } 3817 3818 if (IsTypeName) { 3819 // If we asked for a typename and got a non-type decl, error out. 3820 if (!R.getAsSingle<TypeDecl>()) { 3821 Diag(IdentLoc, diag::err_using_typename_non_type); 3822 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3823 Diag((*I)->getUnderlyingDecl()->getLocation(), 3824 diag::note_using_decl_target); 3825 UD->setInvalidDecl(); 3826 return UD; 3827 } 3828 } else { 3829 // If we asked for a non-typename and we got a type, error out, 3830 // but only if this is an instantiation of an unresolved using 3831 // decl. Otherwise just silently find the type name. 3832 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3833 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3834 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3835 UD->setInvalidDecl(); 3836 return UD; 3837 } 3838 } 3839 3840 // C++0x N2914 [namespace.udecl]p6: 3841 // A using-declaration shall not name a namespace. 3842 if (R.getAsSingle<NamespaceDecl>()) { 3843 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3844 << SS.getRange(); 3845 UD->setInvalidDecl(); 3846 return UD; 3847 } 3848 3849 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3850 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3851 BuildUsingShadowDecl(S, UD, *I); 3852 } 3853 3854 return UD; 3855} 3856 3857/// Checks that the given using declaration is not an invalid 3858/// redeclaration. Note that this is checking only for the using decl 3859/// itself, not for any ill-formedness among the UsingShadowDecls. 3860bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3861 bool isTypeName, 3862 const CXXScopeSpec &SS, 3863 SourceLocation NameLoc, 3864 const LookupResult &Prev) { 3865 // C++03 [namespace.udecl]p8: 3866 // C++0x [namespace.udecl]p10: 3867 // A using-declaration is a declaration and can therefore be used 3868 // repeatedly where (and only where) multiple declarations are 3869 // allowed. 3870 // 3871 // That's in non-member contexts. 3872 if (!CurContext->getLookupContext()->isRecord()) 3873 return false; 3874 3875 NestedNameSpecifier *Qual 3876 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3877 3878 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3879 NamedDecl *D = *I; 3880 3881 bool DTypename; 3882 NestedNameSpecifier *DQual; 3883 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3884 DTypename = UD->isTypeName(); 3885 DQual = UD->getTargetNestedNameDecl(); 3886 } else if (UnresolvedUsingValueDecl *UD 3887 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3888 DTypename = false; 3889 DQual = UD->getTargetNestedNameSpecifier(); 3890 } else if (UnresolvedUsingTypenameDecl *UD 3891 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3892 DTypename = true; 3893 DQual = UD->getTargetNestedNameSpecifier(); 3894 } else continue; 3895 3896 // using decls differ if one says 'typename' and the other doesn't. 3897 // FIXME: non-dependent using decls? 3898 if (isTypeName != DTypename) continue; 3899 3900 // using decls differ if they name different scopes (but note that 3901 // template instantiation can cause this check to trigger when it 3902 // didn't before instantiation). 3903 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3904 Context.getCanonicalNestedNameSpecifier(DQual)) 3905 continue; 3906 3907 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3908 Diag(D->getLocation(), diag::note_using_decl) << 1; 3909 return true; 3910 } 3911 3912 return false; 3913} 3914 3915 3916/// Checks that the given nested-name qualifier used in a using decl 3917/// in the current context is appropriately related to the current 3918/// scope. If an error is found, diagnoses it and returns true. 3919bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3920 const CXXScopeSpec &SS, 3921 SourceLocation NameLoc) { 3922 DeclContext *NamedContext = computeDeclContext(SS); 3923 3924 if (!CurContext->isRecord()) { 3925 // C++03 [namespace.udecl]p3: 3926 // C++0x [namespace.udecl]p8: 3927 // A using-declaration for a class member shall be a member-declaration. 3928 3929 // If we weren't able to compute a valid scope, it must be a 3930 // dependent class scope. 3931 if (!NamedContext || NamedContext->isRecord()) { 3932 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3933 << SS.getRange(); 3934 return true; 3935 } 3936 3937 // Otherwise, everything is known to be fine. 3938 return false; 3939 } 3940 3941 // The current scope is a record. 3942 3943 // If the named context is dependent, we can't decide much. 3944 if (!NamedContext) { 3945 // FIXME: in C++0x, we can diagnose if we can prove that the 3946 // nested-name-specifier does not refer to a base class, which is 3947 // still possible in some cases. 3948 3949 // Otherwise we have to conservatively report that things might be 3950 // okay. 3951 return false; 3952 } 3953 3954 if (!NamedContext->isRecord()) { 3955 // Ideally this would point at the last name in the specifier, 3956 // but we don't have that level of source info. 3957 Diag(SS.getRange().getBegin(), 3958 diag::err_using_decl_nested_name_specifier_is_not_class) 3959 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3960 return true; 3961 } 3962 3963 if (getLangOptions().CPlusPlus0x) { 3964 // C++0x [namespace.udecl]p3: 3965 // In a using-declaration used as a member-declaration, the 3966 // nested-name-specifier shall name a base class of the class 3967 // being defined. 3968 3969 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3970 cast<CXXRecordDecl>(NamedContext))) { 3971 if (CurContext == NamedContext) { 3972 Diag(NameLoc, 3973 diag::err_using_decl_nested_name_specifier_is_current_class) 3974 << SS.getRange(); 3975 return true; 3976 } 3977 3978 Diag(SS.getRange().getBegin(), 3979 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3980 << (NestedNameSpecifier*) SS.getScopeRep() 3981 << cast<CXXRecordDecl>(CurContext) 3982 << SS.getRange(); 3983 return true; 3984 } 3985 3986 return false; 3987 } 3988 3989 // C++03 [namespace.udecl]p4: 3990 // A using-declaration used as a member-declaration shall refer 3991 // to a member of a base class of the class being defined [etc.]. 3992 3993 // Salient point: SS doesn't have to name a base class as long as 3994 // lookup only finds members from base classes. Therefore we can 3995 // diagnose here only if we can prove that that can't happen, 3996 // i.e. if the class hierarchies provably don't intersect. 3997 3998 // TODO: it would be nice if "definitely valid" results were cached 3999 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4000 // need to be repeated. 4001 4002 struct UserData { 4003 llvm::DenseSet<const CXXRecordDecl*> Bases; 4004 4005 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4006 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4007 Data->Bases.insert(Base); 4008 return true; 4009 } 4010 4011 bool hasDependentBases(const CXXRecordDecl *Class) { 4012 return !Class->forallBases(collect, this); 4013 } 4014 4015 /// Returns true if the base is dependent or is one of the 4016 /// accumulated base classes. 4017 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4018 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4019 return !Data->Bases.count(Base); 4020 } 4021 4022 bool mightShareBases(const CXXRecordDecl *Class) { 4023 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4024 } 4025 }; 4026 4027 UserData Data; 4028 4029 // Returns false if we find a dependent base. 4030 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4031 return false; 4032 4033 // Returns false if the class has a dependent base or if it or one 4034 // of its bases is present in the base set of the current context. 4035 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4036 return false; 4037 4038 Diag(SS.getRange().getBegin(), 4039 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4040 << (NestedNameSpecifier*) SS.getScopeRep() 4041 << cast<CXXRecordDecl>(CurContext) 4042 << SS.getRange(); 4043 4044 return true; 4045} 4046 4047Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 4048 SourceLocation NamespaceLoc, 4049 SourceLocation AliasLoc, 4050 IdentifierInfo *Alias, 4051 CXXScopeSpec &SS, 4052 SourceLocation IdentLoc, 4053 IdentifierInfo *Ident) { 4054 4055 // Lookup the namespace name. 4056 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4057 LookupParsedName(R, S, &SS); 4058 4059 // Check if we have a previous declaration with the same name. 4060 NamedDecl *PrevDecl 4061 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4062 ForRedeclaration); 4063 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4064 PrevDecl = 0; 4065 4066 if (PrevDecl) { 4067 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4068 // We already have an alias with the same name that points to the same 4069 // namespace, so don't create a new one. 4070 // FIXME: At some point, we'll want to create the (redundant) 4071 // declaration to maintain better source information. 4072 if (!R.isAmbiguous() && !R.empty() && 4073 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4074 return DeclPtrTy(); 4075 } 4076 4077 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4078 diag::err_redefinition_different_kind; 4079 Diag(AliasLoc, DiagID) << Alias; 4080 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4081 return DeclPtrTy(); 4082 } 4083 4084 if (R.isAmbiguous()) 4085 return DeclPtrTy(); 4086 4087 if (R.empty()) { 4088 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4089 CTC_NoKeywords, 0)) { 4090 if (R.getAsSingle<NamespaceDecl>() || 4091 R.getAsSingle<NamespaceAliasDecl>()) { 4092 if (DeclContext *DC = computeDeclContext(SS, false)) 4093 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4094 << Ident << DC << Corrected << SS.getRange() 4095 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4096 else 4097 Diag(IdentLoc, diag::err_using_directive_suggest) 4098 << Ident << Corrected 4099 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4100 4101 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4102 << Corrected; 4103 4104 Ident = Corrected.getAsIdentifierInfo(); 4105 } else { 4106 R.clear(); 4107 R.setLookupName(Ident); 4108 } 4109 } 4110 4111 if (R.empty()) { 4112 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4113 return DeclPtrTy(); 4114 } 4115 } 4116 4117 NamespaceAliasDecl *AliasDecl = 4118 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4119 Alias, SS.getRange(), 4120 (NestedNameSpecifier *)SS.getScopeRep(), 4121 IdentLoc, R.getFoundDecl()); 4122 4123 PushOnScopeChains(AliasDecl, S); 4124 return DeclPtrTy::make(AliasDecl); 4125} 4126 4127namespace { 4128 /// \brief Scoped object used to handle the state changes required in Sema 4129 /// to implicitly define the body of a C++ member function; 4130 class ImplicitlyDefinedFunctionScope { 4131 Sema &S; 4132 DeclContext *PreviousContext; 4133 4134 public: 4135 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4136 : S(S), PreviousContext(S.CurContext) 4137 { 4138 S.CurContext = Method; 4139 S.PushFunctionScope(); 4140 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4141 } 4142 4143 ~ImplicitlyDefinedFunctionScope() { 4144 S.PopExpressionEvaluationContext(); 4145 S.PopFunctionOrBlockScope(); 4146 S.CurContext = PreviousContext; 4147 } 4148 }; 4149} 4150 4151CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4152 CXXRecordDecl *ClassDecl) { 4153 // C++ [class.ctor]p5: 4154 // A default constructor for a class X is a constructor of class X 4155 // that can be called without an argument. If there is no 4156 // user-declared constructor for class X, a default constructor is 4157 // implicitly declared. An implicitly-declared default constructor 4158 // is an inline public member of its class. 4159 assert(!ClassDecl->hasUserDeclaredConstructor() && 4160 "Should not build implicit default constructor!"); 4161 4162 // FIXME: HACK HACK HACK 4163 if (Context.getExternalSource()) { 4164 // This hack ensures that, when using precompiled headers, the lookup 4165 // table in the DeclContext has already loaded the constructor declarations 4166 // so that we can add a new one. The real fix will go into DeclContext, 4167 // when I figure out what that is. 4168 CanQualType T 4169 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4170 ClassDecl->lookup(Context.DeclarationNames.getCXXConstructorName(T)); 4171 } 4172 4173 // C++ [except.spec]p14: 4174 // An implicitly declared special member function (Clause 12) shall have an 4175 // exception-specification. [...] 4176 ImplicitExceptionSpecification ExceptSpec(Context); 4177 4178 // Direct base-class destructors. 4179 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4180 BEnd = ClassDecl->bases_end(); 4181 B != BEnd; ++B) { 4182 if (B->isVirtual()) // Handled below. 4183 continue; 4184 4185 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4186 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4187 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4188 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4189 else if (CXXConstructorDecl *Constructor 4190 = BaseClassDecl->getDefaultConstructor()) 4191 ExceptSpec.CalledDecl(Constructor); 4192 } 4193 } 4194 4195 // Virtual base-class destructors. 4196 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4197 BEnd = ClassDecl->vbases_end(); 4198 B != BEnd; ++B) { 4199 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4200 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4201 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4202 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4203 else if (CXXConstructorDecl *Constructor 4204 = BaseClassDecl->getDefaultConstructor()) 4205 ExceptSpec.CalledDecl(Constructor); 4206 } 4207 } 4208 4209 // Field destructors. 4210 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4211 FEnd = ClassDecl->field_end(); 4212 F != FEnd; ++F) { 4213 if (const RecordType *RecordTy 4214 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4215 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4216 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4217 ExceptSpec.CalledDecl( 4218 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4219 else if (CXXConstructorDecl *Constructor 4220 = FieldClassDecl->getDefaultConstructor()) 4221 ExceptSpec.CalledDecl(Constructor); 4222 } 4223 } 4224 4225 4226 // Create the actual constructor declaration. 4227 CanQualType ClassType 4228 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4229 DeclarationName Name 4230 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4231 CXXConstructorDecl *DefaultCon 4232 = CXXConstructorDecl::Create(Context, ClassDecl, 4233 ClassDecl->getLocation(), Name, 4234 Context.getFunctionType(Context.VoidTy, 4235 0, 0, false, 0, 4236 ExceptSpec.hasExceptionSpecification(), 4237 ExceptSpec.hasAnyExceptionSpecification(), 4238 ExceptSpec.size(), 4239 ExceptSpec.data(), 4240 FunctionType::ExtInfo()), 4241 /*TInfo=*/0, 4242 /*isExplicit=*/false, 4243 /*isInline=*/true, 4244 /*isImplicitlyDeclared=*/true); 4245 DefaultCon->setAccess(AS_public); 4246 DefaultCon->setImplicit(); 4247 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4248 4249 // Note that we have declared this constructor. 4250 ClassDecl->setDeclaredDefaultConstructor(true); 4251 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4252 4253 if (Scope *S = getScopeForContext(ClassDecl)) 4254 PushOnScopeChains(DefaultCon, S, false); 4255 ClassDecl->addDecl(DefaultCon); 4256 4257 return DefaultCon; 4258} 4259 4260void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4261 CXXConstructorDecl *Constructor) { 4262 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4263 !Constructor->isUsed(false)) && 4264 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4265 4266 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4267 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4268 4269 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4270 ErrorTrap Trap(*this); 4271 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4272 Trap.hasErrorOccurred()) { 4273 Diag(CurrentLocation, diag::note_member_synthesized_at) 4274 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4275 Constructor->setInvalidDecl(); 4276 } else { 4277 Constructor->setUsed(); 4278 MarkVTableUsed(CurrentLocation, ClassDecl); 4279 } 4280} 4281 4282CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4283 // C++ [class.dtor]p2: 4284 // If a class has no user-declared destructor, a destructor is 4285 // declared implicitly. An implicitly-declared destructor is an 4286 // inline public member of its class. 4287 4288 // C++ [except.spec]p14: 4289 // An implicitly declared special member function (Clause 12) shall have 4290 // an exception-specification. 4291 ImplicitExceptionSpecification ExceptSpec(Context); 4292 4293 // Direct base-class destructors. 4294 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4295 BEnd = ClassDecl->bases_end(); 4296 B != BEnd; ++B) { 4297 if (B->isVirtual()) // Handled below. 4298 continue; 4299 4300 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4301 ExceptSpec.CalledDecl( 4302 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4303 } 4304 4305 // Virtual base-class destructors. 4306 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4307 BEnd = ClassDecl->vbases_end(); 4308 B != BEnd; ++B) { 4309 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4310 ExceptSpec.CalledDecl( 4311 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4312 } 4313 4314 // Field destructors. 4315 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4316 FEnd = ClassDecl->field_end(); 4317 F != FEnd; ++F) { 4318 if (const RecordType *RecordTy 4319 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4320 ExceptSpec.CalledDecl( 4321 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4322 } 4323 4324 // Create the actual destructor declaration. 4325 QualType Ty = Context.getFunctionType(Context.VoidTy, 4326 0, 0, false, 0, 4327 ExceptSpec.hasExceptionSpecification(), 4328 ExceptSpec.hasAnyExceptionSpecification(), 4329 ExceptSpec.size(), 4330 ExceptSpec.data(), 4331 FunctionType::ExtInfo()); 4332 4333 CanQualType ClassType 4334 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4335 DeclarationName Name 4336 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4337 CXXDestructorDecl *Destructor 4338 = CXXDestructorDecl::Create(Context, ClassDecl, 4339 ClassDecl->getLocation(), Name, Ty, 4340 /*isInline=*/true, 4341 /*isImplicitlyDeclared=*/true); 4342 Destructor->setAccess(AS_public); 4343 Destructor->setImplicit(); 4344 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4345 4346 // Note that we have declared this destructor. 4347 ClassDecl->setDeclaredDestructor(true); 4348 ++ASTContext::NumImplicitDestructorsDeclared; 4349 4350 // Introduce this destructor into its scope. 4351 if (Scope *S = getScopeForContext(ClassDecl)) 4352 PushOnScopeChains(Destructor, S, false); 4353 ClassDecl->addDecl(Destructor); 4354 4355 // This could be uniqued if it ever proves significant. 4356 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4357 4358 AddOverriddenMethods(ClassDecl, Destructor); 4359 4360 return Destructor; 4361} 4362 4363void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4364 CXXDestructorDecl *Destructor) { 4365 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4366 "DefineImplicitDestructor - call it for implicit default dtor"); 4367 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4368 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4369 4370 if (Destructor->isInvalidDecl()) 4371 return; 4372 4373 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4374 4375 ErrorTrap Trap(*this); 4376 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4377 Destructor->getParent()); 4378 4379 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4380 Diag(CurrentLocation, diag::note_member_synthesized_at) 4381 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4382 4383 Destructor->setInvalidDecl(); 4384 return; 4385 } 4386 4387 Destructor->setUsed(); 4388 MarkVTableUsed(CurrentLocation, ClassDecl); 4389} 4390 4391/// \brief Builds a statement that copies the given entity from \p From to 4392/// \c To. 4393/// 4394/// This routine is used to copy the members of a class with an 4395/// implicitly-declared copy assignment operator. When the entities being 4396/// copied are arrays, this routine builds for loops to copy them. 4397/// 4398/// \param S The Sema object used for type-checking. 4399/// 4400/// \param Loc The location where the implicit copy is being generated. 4401/// 4402/// \param T The type of the expressions being copied. Both expressions must 4403/// have this type. 4404/// 4405/// \param To The expression we are copying to. 4406/// 4407/// \param From The expression we are copying from. 4408/// 4409/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4410/// Otherwise, it's a non-static member subobject. 4411/// 4412/// \param Depth Internal parameter recording the depth of the recursion. 4413/// 4414/// \returns A statement or a loop that copies the expressions. 4415static Sema::OwningStmtResult 4416BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4417 Sema::OwningExprResult To, Sema::OwningExprResult From, 4418 bool CopyingBaseSubobject, unsigned Depth = 0) { 4419 typedef Sema::OwningStmtResult OwningStmtResult; 4420 typedef Sema::OwningExprResult OwningExprResult; 4421 4422 // C++0x [class.copy]p30: 4423 // Each subobject is assigned in the manner appropriate to its type: 4424 // 4425 // - if the subobject is of class type, the copy assignment operator 4426 // for the class is used (as if by explicit qualification; that is, 4427 // ignoring any possible virtual overriding functions in more derived 4428 // classes); 4429 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4430 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4431 4432 // Look for operator=. 4433 DeclarationName Name 4434 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4435 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4436 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4437 4438 // Filter out any result that isn't a copy-assignment operator. 4439 LookupResult::Filter F = OpLookup.makeFilter(); 4440 while (F.hasNext()) { 4441 NamedDecl *D = F.next(); 4442 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4443 if (Method->isCopyAssignmentOperator()) 4444 continue; 4445 4446 F.erase(); 4447 } 4448 F.done(); 4449 4450 // Suppress the protected check (C++ [class.protected]) for each of the 4451 // assignment operators we found. This strange dance is required when 4452 // we're assigning via a base classes's copy-assignment operator. To 4453 // ensure that we're getting the right base class subobject (without 4454 // ambiguities), we need to cast "this" to that subobject type; to 4455 // ensure that we don't go through the virtual call mechanism, we need 4456 // to qualify the operator= name with the base class (see below). However, 4457 // this means that if the base class has a protected copy assignment 4458 // operator, the protected member access check will fail. So, we 4459 // rewrite "protected" access to "public" access in this case, since we 4460 // know by construction that we're calling from a derived class. 4461 if (CopyingBaseSubobject) { 4462 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4463 L != LEnd; ++L) { 4464 if (L.getAccess() == AS_protected) 4465 L.setAccess(AS_public); 4466 } 4467 } 4468 4469 // Create the nested-name-specifier that will be used to qualify the 4470 // reference to operator=; this is required to suppress the virtual 4471 // call mechanism. 4472 CXXScopeSpec SS; 4473 SS.setRange(Loc); 4474 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4475 T.getTypePtr())); 4476 4477 // Create the reference to operator=. 4478 OwningExprResult OpEqualRef 4479 = S.BuildMemberReferenceExpr(move(To), T, Loc, /*isArrow=*/false, SS, 4480 /*FirstQualifierInScope=*/0, OpLookup, 4481 /*TemplateArgs=*/0, 4482 /*SuppressQualifierCheck=*/true); 4483 if (OpEqualRef.isInvalid()) 4484 return S.StmtError(); 4485 4486 // Build the call to the assignment operator. 4487 Expr *FromE = From.takeAs<Expr>(); 4488 OwningExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4489 OpEqualRef.takeAs<Expr>(), 4490 Loc, &FromE, 1, 0, Loc); 4491 if (Call.isInvalid()) 4492 return S.StmtError(); 4493 4494 return S.Owned(Call.takeAs<Stmt>()); 4495 } 4496 4497 // - if the subobject is of scalar type, the built-in assignment 4498 // operator is used. 4499 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4500 if (!ArrayTy) { 4501 OwningExprResult Assignment = S.CreateBuiltinBinOp(Loc, 4502 BinaryOperator::Assign, 4503 To.takeAs<Expr>(), 4504 From.takeAs<Expr>()); 4505 if (Assignment.isInvalid()) 4506 return S.StmtError(); 4507 4508 return S.Owned(Assignment.takeAs<Stmt>()); 4509 } 4510 4511 // - if the subobject is an array, each element is assigned, in the 4512 // manner appropriate to the element type; 4513 4514 // Construct a loop over the array bounds, e.g., 4515 // 4516 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4517 // 4518 // that will copy each of the array elements. 4519 QualType SizeType = S.Context.getSizeType(); 4520 4521 // Create the iteration variable. 4522 IdentifierInfo *IterationVarName = 0; 4523 { 4524 llvm::SmallString<8> Str; 4525 llvm::raw_svector_ostream OS(Str); 4526 OS << "__i" << Depth; 4527 IterationVarName = &S.Context.Idents.get(OS.str()); 4528 } 4529 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4530 IterationVarName, SizeType, 4531 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4532 VarDecl::None, VarDecl::None); 4533 4534 // Initialize the iteration variable to zero. 4535 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4536 IterationVar->setInit(new (S.Context) IntegerLiteral(Zero, SizeType, Loc)); 4537 4538 // Create a reference to the iteration variable; we'll use this several 4539 // times throughout. 4540 Expr *IterationVarRef 4541 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4542 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4543 4544 // Create the DeclStmt that holds the iteration variable. 4545 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4546 4547 // Create the comparison against the array bound. 4548 llvm::APInt Upper = ArrayTy->getSize(); 4549 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4550 OwningExprResult Comparison 4551 = S.Owned(new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4552 new (S.Context) IntegerLiteral(Upper, SizeType, Loc), 4553 BinaryOperator::NE, S.Context.BoolTy, Loc)); 4554 4555 // Create the pre-increment of the iteration variable. 4556 OwningExprResult Increment 4557 = S.Owned(new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4558 UnaryOperator::PreInc, 4559 SizeType, Loc)); 4560 4561 // Subscript the "from" and "to" expressions with the iteration variable. 4562 From = S.CreateBuiltinArraySubscriptExpr(move(From), Loc, 4563 S.Owned(IterationVarRef->Retain()), 4564 Loc); 4565 To = S.CreateBuiltinArraySubscriptExpr(move(To), Loc, 4566 S.Owned(IterationVarRef->Retain()), 4567 Loc); 4568 assert(!From.isInvalid() && "Builtin subscripting can't fail!"); 4569 assert(!To.isInvalid() && "Builtin subscripting can't fail!"); 4570 4571 // Build the copy for an individual element of the array. 4572 OwningStmtResult Copy = BuildSingleCopyAssign(S, Loc, 4573 ArrayTy->getElementType(), 4574 move(To), move(From), 4575 CopyingBaseSubobject, Depth+1); 4576 if (Copy.isInvalid()) { 4577 InitStmt->Destroy(S.Context); 4578 return S.StmtError(); 4579 } 4580 4581 // Construct the loop that copies all elements of this array. 4582 return S.ActOnForStmt(Loc, Loc, S.Owned(InitStmt), 4583 S.MakeFullExpr(Comparison), 4584 Sema::DeclPtrTy(), 4585 S.MakeFullExpr(Increment), 4586 Loc, move(Copy)); 4587} 4588 4589/// \brief Determine whether the given class has a copy assignment operator 4590/// that accepts a const-qualified argument. 4591static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4592 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4593 4594 if (!Class->hasDeclaredCopyAssignment()) 4595 S.DeclareImplicitCopyAssignment(Class); 4596 4597 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4598 DeclarationName OpName 4599 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4600 4601 DeclContext::lookup_const_iterator Op, OpEnd; 4602 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4603 // C++ [class.copy]p9: 4604 // A user-declared copy assignment operator is a non-static non-template 4605 // member function of class X with exactly one parameter of type X, X&, 4606 // const X&, volatile X& or const volatile X&. 4607 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4608 if (!Method) 4609 continue; 4610 4611 if (Method->isStatic()) 4612 continue; 4613 if (Method->getPrimaryTemplate()) 4614 continue; 4615 const FunctionProtoType *FnType = 4616 Method->getType()->getAs<FunctionProtoType>(); 4617 assert(FnType && "Overloaded operator has no prototype."); 4618 // Don't assert on this; an invalid decl might have been left in the AST. 4619 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4620 continue; 4621 bool AcceptsConst = true; 4622 QualType ArgType = FnType->getArgType(0); 4623 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4624 ArgType = Ref->getPointeeType(); 4625 // Is it a non-const lvalue reference? 4626 if (!ArgType.isConstQualified()) 4627 AcceptsConst = false; 4628 } 4629 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4630 continue; 4631 4632 // We have a single argument of type cv X or cv X&, i.e. we've found the 4633 // copy assignment operator. Return whether it accepts const arguments. 4634 return AcceptsConst; 4635 } 4636 assert(Class->isInvalidDecl() && 4637 "No copy assignment operator declared in valid code."); 4638 return false; 4639} 4640 4641CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4642 // Note: The following rules are largely analoguous to the copy 4643 // constructor rules. Note that virtual bases are not taken into account 4644 // for determining the argument type of the operator. Note also that 4645 // operators taking an object instead of a reference are allowed. 4646 4647 4648 // FIXME: HACK HACK HACK 4649 if (Context.getExternalSource()) { 4650 // This hack ensures that, when using precompiled headers, the lookup 4651 // table in the DeclContext has already loaded the assignment operator 4652 // declarations so that we can add a new one. The real fix will go into 4653 // DeclContext, when I figure out what that is. 4654 ClassDecl->lookup(Context.DeclarationNames.getCXXOperatorName(OO_Equal)); 4655 } 4656 4657 // C++ [class.copy]p10: 4658 // If the class definition does not explicitly declare a copy 4659 // assignment operator, one is declared implicitly. 4660 // The implicitly-defined copy assignment operator for a class X 4661 // will have the form 4662 // 4663 // X& X::operator=(const X&) 4664 // 4665 // if 4666 bool HasConstCopyAssignment = true; 4667 4668 // -- each direct base class B of X has a copy assignment operator 4669 // whose parameter is of type const B&, const volatile B& or B, 4670 // and 4671 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4672 BaseEnd = ClassDecl->bases_end(); 4673 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4674 assert(!Base->getType()->isDependentType() && 4675 "Cannot generate implicit members for class with dependent bases."); 4676 const CXXRecordDecl *BaseClassDecl 4677 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4678 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4679 } 4680 4681 // -- for all the nonstatic data members of X that are of a class 4682 // type M (or array thereof), each such class type has a copy 4683 // assignment operator whose parameter is of type const M&, 4684 // const volatile M& or M. 4685 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4686 FieldEnd = ClassDecl->field_end(); 4687 HasConstCopyAssignment && Field != FieldEnd; 4688 ++Field) { 4689 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4690 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4691 const CXXRecordDecl *FieldClassDecl 4692 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4693 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4694 } 4695 } 4696 4697 // Otherwise, the implicitly declared copy assignment operator will 4698 // have the form 4699 // 4700 // X& X::operator=(X&) 4701 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4702 QualType RetType = Context.getLValueReferenceType(ArgType); 4703 if (HasConstCopyAssignment) 4704 ArgType = ArgType.withConst(); 4705 ArgType = Context.getLValueReferenceType(ArgType); 4706 4707 // C++ [except.spec]p14: 4708 // An implicitly declared special member function (Clause 12) shall have an 4709 // exception-specification. [...] 4710 ImplicitExceptionSpecification ExceptSpec(Context); 4711 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4712 BaseEnd = ClassDecl->bases_end(); 4713 Base != BaseEnd; ++Base) { 4714 CXXRecordDecl *BaseClassDecl 4715 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4716 4717 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4718 DeclareImplicitCopyAssignment(BaseClassDecl); 4719 4720 if (CXXMethodDecl *CopyAssign 4721 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4722 ExceptSpec.CalledDecl(CopyAssign); 4723 } 4724 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4725 FieldEnd = ClassDecl->field_end(); 4726 Field != FieldEnd; 4727 ++Field) { 4728 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4729 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4730 CXXRecordDecl *FieldClassDecl 4731 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4732 4733 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 4734 DeclareImplicitCopyAssignment(FieldClassDecl); 4735 4736 if (CXXMethodDecl *CopyAssign 4737 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4738 ExceptSpec.CalledDecl(CopyAssign); 4739 } 4740 } 4741 4742 // An implicitly-declared copy assignment operator is an inline public 4743 // member of its class. 4744 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4745 CXXMethodDecl *CopyAssignment 4746 = CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 4747 Context.getFunctionType(RetType, &ArgType, 1, 4748 false, 0, 4749 ExceptSpec.hasExceptionSpecification(), 4750 ExceptSpec.hasAnyExceptionSpecification(), 4751 ExceptSpec.size(), 4752 ExceptSpec.data(), 4753 FunctionType::ExtInfo()), 4754 /*TInfo=*/0, /*isStatic=*/false, 4755 /*StorageClassAsWritten=*/FunctionDecl::None, 4756 /*isInline=*/true); 4757 CopyAssignment->setAccess(AS_public); 4758 CopyAssignment->setImplicit(); 4759 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4760 CopyAssignment->setCopyAssignment(true); 4761 4762 // Add the parameter to the operator. 4763 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4764 ClassDecl->getLocation(), 4765 /*Id=*/0, 4766 ArgType, /*TInfo=*/0, 4767 VarDecl::None, 4768 VarDecl::None, 0); 4769 CopyAssignment->setParams(&FromParam, 1); 4770 4771 // Note that we have added this copy-assignment operator. 4772 ClassDecl->setDeclaredCopyAssignment(true); 4773 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 4774 4775 if (Scope *S = getScopeForContext(ClassDecl)) 4776 PushOnScopeChains(CopyAssignment, S, false); 4777 ClassDecl->addDecl(CopyAssignment); 4778 4779 AddOverriddenMethods(ClassDecl, CopyAssignment); 4780 return CopyAssignment; 4781} 4782 4783void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4784 CXXMethodDecl *CopyAssignOperator) { 4785 assert((CopyAssignOperator->isImplicit() && 4786 CopyAssignOperator->isOverloadedOperator() && 4787 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4788 !CopyAssignOperator->isUsed(false)) && 4789 "DefineImplicitCopyAssignment called for wrong function"); 4790 4791 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4792 4793 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4794 CopyAssignOperator->setInvalidDecl(); 4795 return; 4796 } 4797 4798 CopyAssignOperator->setUsed(); 4799 4800 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4801 ErrorTrap Trap(*this); 4802 4803 // C++0x [class.copy]p30: 4804 // The implicitly-defined or explicitly-defaulted copy assignment operator 4805 // for a non-union class X performs memberwise copy assignment of its 4806 // subobjects. The direct base classes of X are assigned first, in the 4807 // order of their declaration in the base-specifier-list, and then the 4808 // immediate non-static data members of X are assigned, in the order in 4809 // which they were declared in the class definition. 4810 4811 // The statements that form the synthesized function body. 4812 ASTOwningVector<&ActionBase::DeleteStmt> Statements(*this); 4813 4814 // The parameter for the "other" object, which we are copying from. 4815 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4816 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4817 QualType OtherRefType = Other->getType(); 4818 if (const LValueReferenceType *OtherRef 4819 = OtherRefType->getAs<LValueReferenceType>()) { 4820 OtherRefType = OtherRef->getPointeeType(); 4821 OtherQuals = OtherRefType.getQualifiers(); 4822 } 4823 4824 // Our location for everything implicitly-generated. 4825 SourceLocation Loc = CopyAssignOperator->getLocation(); 4826 4827 // Construct a reference to the "other" object. We'll be using this 4828 // throughout the generated ASTs. 4829 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4830 assert(OtherRef && "Reference to parameter cannot fail!"); 4831 4832 // Construct the "this" pointer. We'll be using this throughout the generated 4833 // ASTs. 4834 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4835 assert(This && "Reference to this cannot fail!"); 4836 4837 // Assign base classes. 4838 bool Invalid = false; 4839 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4840 E = ClassDecl->bases_end(); Base != E; ++Base) { 4841 // Form the assignment: 4842 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4843 QualType BaseType = Base->getType().getUnqualifiedType(); 4844 CXXRecordDecl *BaseClassDecl = 0; 4845 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4846 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4847 else { 4848 Invalid = true; 4849 continue; 4850 } 4851 4852 // Construct the "from" expression, which is an implicit cast to the 4853 // appropriately-qualified base type. 4854 Expr *From = OtherRef->Retain(); 4855 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4856 CastExpr::CK_UncheckedDerivedToBase, /*isLvalue=*/true, 4857 CXXBaseSpecifierArray(Base)); 4858 4859 // Dereference "this". 4860 OwningExprResult To = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4861 Owned(This->Retain())); 4862 4863 // Implicitly cast "this" to the appropriately-qualified base type. 4864 Expr *ToE = To.takeAs<Expr>(); 4865 ImpCastExprToType(ToE, 4866 Context.getCVRQualifiedType(BaseType, 4867 CopyAssignOperator->getTypeQualifiers()), 4868 CastExpr::CK_UncheckedDerivedToBase, 4869 /*isLvalue=*/true, CXXBaseSpecifierArray(Base)); 4870 To = Owned(ToE); 4871 4872 // Build the copy. 4873 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4874 move(To), Owned(From), 4875 /*CopyingBaseSubobject=*/true); 4876 if (Copy.isInvalid()) { 4877 Diag(CurrentLocation, diag::note_member_synthesized_at) 4878 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4879 CopyAssignOperator->setInvalidDecl(); 4880 return; 4881 } 4882 4883 // Success! Record the copy. 4884 Statements.push_back(Copy.takeAs<Expr>()); 4885 } 4886 4887 // \brief Reference to the __builtin_memcpy function. 4888 Expr *BuiltinMemCpyRef = 0; 4889 // \brief Reference to the __builtin_objc_memmove_collectable function. 4890 Expr *CollectableMemCpyRef = 0; 4891 4892 // Assign non-static members. 4893 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4894 FieldEnd = ClassDecl->field_end(); 4895 Field != FieldEnd; ++Field) { 4896 // Check for members of reference type; we can't copy those. 4897 if (Field->getType()->isReferenceType()) { 4898 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4899 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4900 Diag(Field->getLocation(), diag::note_declared_at); 4901 Diag(CurrentLocation, diag::note_member_synthesized_at) 4902 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4903 Invalid = true; 4904 continue; 4905 } 4906 4907 // Check for members of const-qualified, non-class type. 4908 QualType BaseType = Context.getBaseElementType(Field->getType()); 4909 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4910 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4911 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4912 Diag(Field->getLocation(), diag::note_declared_at); 4913 Diag(CurrentLocation, diag::note_member_synthesized_at) 4914 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4915 Invalid = true; 4916 continue; 4917 } 4918 4919 QualType FieldType = Field->getType().getNonReferenceType(); 4920 if (FieldType->isIncompleteArrayType()) { 4921 assert(ClassDecl->hasFlexibleArrayMember() && 4922 "Incomplete array type is not valid"); 4923 continue; 4924 } 4925 4926 // Build references to the field in the object we're copying from and to. 4927 CXXScopeSpec SS; // Intentionally empty 4928 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 4929 LookupMemberName); 4930 MemberLookup.addDecl(*Field); 4931 MemberLookup.resolveKind(); 4932 OwningExprResult From = BuildMemberReferenceExpr(Owned(OtherRef->Retain()), 4933 OtherRefType, 4934 Loc, /*IsArrow=*/false, 4935 SS, 0, MemberLookup, 0); 4936 OwningExprResult To = BuildMemberReferenceExpr(Owned(This->Retain()), 4937 This->getType(), 4938 Loc, /*IsArrow=*/true, 4939 SS, 0, MemberLookup, 0); 4940 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 4941 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 4942 4943 // If the field should be copied with __builtin_memcpy rather than via 4944 // explicit assignments, do so. This optimization only applies for arrays 4945 // of scalars and arrays of class type with trivial copy-assignment 4946 // operators. 4947 if (FieldType->isArrayType() && 4948 (!BaseType->isRecordType() || 4949 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 4950 ->hasTrivialCopyAssignment())) { 4951 // Compute the size of the memory buffer to be copied. 4952 QualType SizeType = Context.getSizeType(); 4953 llvm::APInt Size(Context.getTypeSize(SizeType), 4954 Context.getTypeSizeInChars(BaseType).getQuantity()); 4955 for (const ConstantArrayType *Array 4956 = Context.getAsConstantArrayType(FieldType); 4957 Array; 4958 Array = Context.getAsConstantArrayType(Array->getElementType())) { 4959 llvm::APInt ArraySize = Array->getSize(); 4960 ArraySize.zextOrTrunc(Size.getBitWidth()); 4961 Size *= ArraySize; 4962 } 4963 4964 // Take the address of the field references for "from" and "to". 4965 From = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(From)); 4966 To = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(To)); 4967 4968 bool NeedsCollectableMemCpy = 4969 (BaseType->isRecordType() && 4970 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 4971 4972 if (NeedsCollectableMemCpy) { 4973 if (!CollectableMemCpyRef) { 4974 // Create a reference to the __builtin_objc_memmove_collectable function. 4975 LookupResult R(*this, 4976 &Context.Idents.get("__builtin_objc_memmove_collectable"), 4977 Loc, LookupOrdinaryName); 4978 LookupName(R, TUScope, true); 4979 4980 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 4981 if (!CollectableMemCpy) { 4982 // Something went horribly wrong earlier, and we will have 4983 // complained about it. 4984 Invalid = true; 4985 continue; 4986 } 4987 4988 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 4989 CollectableMemCpy->getType(), 4990 Loc, 0).takeAs<Expr>(); 4991 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 4992 } 4993 } 4994 // Create a reference to the __builtin_memcpy builtin function. 4995 else if (!BuiltinMemCpyRef) { 4996 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 4997 LookupOrdinaryName); 4998 LookupName(R, TUScope, true); 4999 5000 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5001 if (!BuiltinMemCpy) { 5002 // Something went horribly wrong earlier, and we will have complained 5003 // about it. 5004 Invalid = true; 5005 continue; 5006 } 5007 5008 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5009 BuiltinMemCpy->getType(), 5010 Loc, 0).takeAs<Expr>(); 5011 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5012 } 5013 5014 ASTOwningVector<&ActionBase::DeleteExpr> CallArgs(*this); 5015 CallArgs.push_back(To.takeAs<Expr>()); 5016 CallArgs.push_back(From.takeAs<Expr>()); 5017 CallArgs.push_back(new (Context) IntegerLiteral(Size, SizeType, Loc)); 5018 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 5019 Commas.push_back(Loc); 5020 Commas.push_back(Loc); 5021 OwningExprResult Call = ExprError(); 5022 if (NeedsCollectableMemCpy) 5023 Call = ActOnCallExpr(/*Scope=*/0, 5024 Owned(CollectableMemCpyRef->Retain()), 5025 Loc, move_arg(CallArgs), 5026 Commas.data(), Loc); 5027 else 5028 Call = ActOnCallExpr(/*Scope=*/0, 5029 Owned(BuiltinMemCpyRef->Retain()), 5030 Loc, move_arg(CallArgs), 5031 Commas.data(), Loc); 5032 5033 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5034 Statements.push_back(Call.takeAs<Expr>()); 5035 continue; 5036 } 5037 5038 // Build the copy of this field. 5039 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5040 move(To), move(From), 5041 /*CopyingBaseSubobject=*/false); 5042 if (Copy.isInvalid()) { 5043 Diag(CurrentLocation, diag::note_member_synthesized_at) 5044 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5045 CopyAssignOperator->setInvalidDecl(); 5046 return; 5047 } 5048 5049 // Success! Record the copy. 5050 Statements.push_back(Copy.takeAs<Stmt>()); 5051 } 5052 5053 if (!Invalid) { 5054 // Add a "return *this;" 5055 OwningExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 5056 Owned(This->Retain())); 5057 5058 OwningStmtResult Return = ActOnReturnStmt(Loc, move(ThisObj)); 5059 if (Return.isInvalid()) 5060 Invalid = true; 5061 else { 5062 Statements.push_back(Return.takeAs<Stmt>()); 5063 5064 if (Trap.hasErrorOccurred()) { 5065 Diag(CurrentLocation, diag::note_member_synthesized_at) 5066 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5067 Invalid = true; 5068 } 5069 } 5070 } 5071 5072 if (Invalid) { 5073 CopyAssignOperator->setInvalidDecl(); 5074 return; 5075 } 5076 5077 OwningStmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5078 /*isStmtExpr=*/false); 5079 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5080 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5081} 5082 5083CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5084 CXXRecordDecl *ClassDecl) { 5085 // C++ [class.copy]p4: 5086 // If the class definition does not explicitly declare a copy 5087 // constructor, one is declared implicitly. 5088 5089 // FIXME: HACK HACK HACK 5090 if (Context.getExternalSource()) { 5091 // This hack ensures that, when using precompiled headers, the lookup 5092 // table in the DeclContext has already loaded the constructor declarations 5093 // so that we can add a new one. The real fix will go into DeclContext, 5094 // when I figure out what that is. 5095 CanQualType T 5096 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5097 ClassDecl->lookup(Context.DeclarationNames.getCXXConstructorName(T)); 5098 } 5099 5100 // C++ [class.copy]p5: 5101 // The implicitly-declared copy constructor for a class X will 5102 // have the form 5103 // 5104 // X::X(const X&) 5105 // 5106 // if 5107 bool HasConstCopyConstructor = true; 5108 5109 // -- each direct or virtual base class B of X has a copy 5110 // constructor whose first parameter is of type const B& or 5111 // const volatile B&, and 5112 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5113 BaseEnd = ClassDecl->bases_end(); 5114 HasConstCopyConstructor && Base != BaseEnd; 5115 ++Base) { 5116 // Virtual bases are handled below. 5117 if (Base->isVirtual()) 5118 continue; 5119 5120 CXXRecordDecl *BaseClassDecl 5121 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5122 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5123 DeclareImplicitCopyConstructor(BaseClassDecl); 5124 5125 HasConstCopyConstructor 5126 = BaseClassDecl->hasConstCopyConstructor(Context); 5127 } 5128 5129 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5130 BaseEnd = ClassDecl->vbases_end(); 5131 HasConstCopyConstructor && Base != BaseEnd; 5132 ++Base) { 5133 CXXRecordDecl *BaseClassDecl 5134 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5135 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5136 DeclareImplicitCopyConstructor(BaseClassDecl); 5137 5138 HasConstCopyConstructor 5139 = BaseClassDecl->hasConstCopyConstructor(Context); 5140 } 5141 5142 // -- for all the nonstatic data members of X that are of a 5143 // class type M (or array thereof), each such class type 5144 // has a copy constructor whose first parameter is of type 5145 // const M& or const volatile M&. 5146 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5147 FieldEnd = ClassDecl->field_end(); 5148 HasConstCopyConstructor && Field != FieldEnd; 5149 ++Field) { 5150 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5151 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5152 CXXRecordDecl *FieldClassDecl 5153 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5154 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5155 DeclareImplicitCopyConstructor(FieldClassDecl); 5156 5157 HasConstCopyConstructor 5158 = FieldClassDecl->hasConstCopyConstructor(Context); 5159 } 5160 } 5161 5162 // Otherwise, the implicitly declared copy constructor will have 5163 // the form 5164 // 5165 // X::X(X&) 5166 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5167 QualType ArgType = ClassType; 5168 if (HasConstCopyConstructor) 5169 ArgType = ArgType.withConst(); 5170 ArgType = Context.getLValueReferenceType(ArgType); 5171 5172 // C++ [except.spec]p14: 5173 // An implicitly declared special member function (Clause 12) shall have an 5174 // exception-specification. [...] 5175 ImplicitExceptionSpecification ExceptSpec(Context); 5176 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5177 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5178 BaseEnd = ClassDecl->bases_end(); 5179 Base != BaseEnd; 5180 ++Base) { 5181 // Virtual bases are handled below. 5182 if (Base->isVirtual()) 5183 continue; 5184 5185 CXXRecordDecl *BaseClassDecl 5186 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5187 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5188 DeclareImplicitCopyConstructor(BaseClassDecl); 5189 5190 if (CXXConstructorDecl *CopyConstructor 5191 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5192 ExceptSpec.CalledDecl(CopyConstructor); 5193 } 5194 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5195 BaseEnd = ClassDecl->vbases_end(); 5196 Base != BaseEnd; 5197 ++Base) { 5198 CXXRecordDecl *BaseClassDecl 5199 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5200 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5201 DeclareImplicitCopyConstructor(BaseClassDecl); 5202 5203 if (CXXConstructorDecl *CopyConstructor 5204 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5205 ExceptSpec.CalledDecl(CopyConstructor); 5206 } 5207 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5208 FieldEnd = ClassDecl->field_end(); 5209 Field != FieldEnd; 5210 ++Field) { 5211 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5212 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5213 CXXRecordDecl *FieldClassDecl 5214 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5215 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5216 DeclareImplicitCopyConstructor(FieldClassDecl); 5217 5218 if (CXXConstructorDecl *CopyConstructor 5219 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5220 ExceptSpec.CalledDecl(CopyConstructor); 5221 } 5222 } 5223 5224 // An implicitly-declared copy constructor is an inline public 5225 // member of its class. 5226 DeclarationName Name 5227 = Context.DeclarationNames.getCXXConstructorName( 5228 Context.getCanonicalType(ClassType)); 5229 CXXConstructorDecl *CopyConstructor 5230 = CXXConstructorDecl::Create(Context, ClassDecl, 5231 ClassDecl->getLocation(), Name, 5232 Context.getFunctionType(Context.VoidTy, 5233 &ArgType, 1, 5234 false, 0, 5235 ExceptSpec.hasExceptionSpecification(), 5236 ExceptSpec.hasAnyExceptionSpecification(), 5237 ExceptSpec.size(), 5238 ExceptSpec.data(), 5239 FunctionType::ExtInfo()), 5240 /*TInfo=*/0, 5241 /*isExplicit=*/false, 5242 /*isInline=*/true, 5243 /*isImplicitlyDeclared=*/true); 5244 CopyConstructor->setAccess(AS_public); 5245 CopyConstructor->setImplicit(); 5246 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5247 5248 // Note that we have declared this constructor. 5249 ClassDecl->setDeclaredCopyConstructor(true); 5250 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5251 5252 // Add the parameter to the constructor. 5253 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5254 ClassDecl->getLocation(), 5255 /*IdentifierInfo=*/0, 5256 ArgType, /*TInfo=*/0, 5257 VarDecl::None, 5258 VarDecl::None, 0); 5259 CopyConstructor->setParams(&FromParam, 1); 5260 if (Scope *S = getScopeForContext(ClassDecl)) 5261 PushOnScopeChains(CopyConstructor, S, false); 5262 ClassDecl->addDecl(CopyConstructor); 5263 5264 return CopyConstructor; 5265} 5266 5267void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5268 CXXConstructorDecl *CopyConstructor, 5269 unsigned TypeQuals) { 5270 assert((CopyConstructor->isImplicit() && 5271 CopyConstructor->isCopyConstructor(TypeQuals) && 5272 !CopyConstructor->isUsed(false)) && 5273 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5274 5275 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5276 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5277 5278 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5279 ErrorTrap Trap(*this); 5280 5281 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5282 Trap.hasErrorOccurred()) { 5283 Diag(CurrentLocation, diag::note_member_synthesized_at) 5284 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5285 CopyConstructor->setInvalidDecl(); 5286 } else { 5287 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5288 CopyConstructor->getLocation(), 5289 MultiStmtArg(*this, 0, 0), 5290 /*isStmtExpr=*/false) 5291 .takeAs<Stmt>()); 5292 } 5293 5294 CopyConstructor->setUsed(); 5295} 5296 5297Sema::OwningExprResult 5298Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5299 CXXConstructorDecl *Constructor, 5300 MultiExprArg ExprArgs, 5301 bool RequiresZeroInit, 5302 CXXConstructExpr::ConstructionKind ConstructKind) { 5303 bool Elidable = false; 5304 5305 // C++0x [class.copy]p34: 5306 // When certain criteria are met, an implementation is allowed to 5307 // omit the copy/move construction of a class object, even if the 5308 // copy/move constructor and/or destructor for the object have 5309 // side effects. [...] 5310 // - when a temporary class object that has not been bound to a 5311 // reference (12.2) would be copied/moved to a class object 5312 // with the same cv-unqualified type, the copy/move operation 5313 // can be omitted by constructing the temporary object 5314 // directly into the target of the omitted copy/move 5315 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5316 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5317 Elidable = SubExpr->isTemporaryObject() && 5318 Context.hasSameUnqualifiedType(SubExpr->getType(), 5319 Context.getTypeDeclType(Constructor->getParent())); 5320 } 5321 5322 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5323 Elidable, move(ExprArgs), RequiresZeroInit, 5324 ConstructKind); 5325} 5326 5327/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5328/// including handling of its default argument expressions. 5329Sema::OwningExprResult 5330Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5331 CXXConstructorDecl *Constructor, bool Elidable, 5332 MultiExprArg ExprArgs, 5333 bool RequiresZeroInit, 5334 CXXConstructExpr::ConstructionKind ConstructKind) { 5335 unsigned NumExprs = ExprArgs.size(); 5336 Expr **Exprs = (Expr **)ExprArgs.release(); 5337 5338 MarkDeclarationReferenced(ConstructLoc, Constructor); 5339 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5340 Constructor, Elidable, Exprs, NumExprs, 5341 RequiresZeroInit, ConstructKind)); 5342} 5343 5344bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5345 CXXConstructorDecl *Constructor, 5346 MultiExprArg Exprs) { 5347 OwningExprResult TempResult = 5348 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5349 move(Exprs)); 5350 if (TempResult.isInvalid()) 5351 return true; 5352 5353 Expr *Temp = TempResult.takeAs<Expr>(); 5354 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5355 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 5356 VD->setInit(Temp); 5357 5358 return false; 5359} 5360 5361void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5362 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5363 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5364 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5365 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5366 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5367 CheckDestructorAccess(VD->getLocation(), Destructor, 5368 PDiag(diag::err_access_dtor_var) 5369 << VD->getDeclName() 5370 << VD->getType()); 5371 } 5372} 5373 5374/// AddCXXDirectInitializerToDecl - This action is called immediately after 5375/// ActOnDeclarator, when a C++ direct initializer is present. 5376/// e.g: "int x(1);" 5377void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 5378 SourceLocation LParenLoc, 5379 MultiExprArg Exprs, 5380 SourceLocation *CommaLocs, 5381 SourceLocation RParenLoc) { 5382 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5383 Decl *RealDecl = Dcl.getAs<Decl>(); 5384 5385 // If there is no declaration, there was an error parsing it. Just ignore 5386 // the initializer. 5387 if (RealDecl == 0) 5388 return; 5389 5390 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5391 if (!VDecl) { 5392 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5393 RealDecl->setInvalidDecl(); 5394 return; 5395 } 5396 5397 // We will represent direct-initialization similarly to copy-initialization: 5398 // int x(1); -as-> int x = 1; 5399 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5400 // 5401 // Clients that want to distinguish between the two forms, can check for 5402 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5403 // A major benefit is that clients that don't particularly care about which 5404 // exactly form was it (like the CodeGen) can handle both cases without 5405 // special case code. 5406 5407 // C++ 8.5p11: 5408 // The form of initialization (using parentheses or '=') is generally 5409 // insignificant, but does matter when the entity being initialized has a 5410 // class type. 5411 QualType DeclInitType = VDecl->getType(); 5412 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 5413 DeclInitType = Context.getBaseElementType(Array); 5414 5415 if (!VDecl->getType()->isDependentType() && 5416 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5417 diag::err_typecheck_decl_incomplete_type)) { 5418 VDecl->setInvalidDecl(); 5419 return; 5420 } 5421 5422 // The variable can not have an abstract class type. 5423 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5424 diag::err_abstract_type_in_decl, 5425 AbstractVariableType)) 5426 VDecl->setInvalidDecl(); 5427 5428 const VarDecl *Def; 5429 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5430 Diag(VDecl->getLocation(), diag::err_redefinition) 5431 << VDecl->getDeclName(); 5432 Diag(Def->getLocation(), diag::note_previous_definition); 5433 VDecl->setInvalidDecl(); 5434 return; 5435 } 5436 5437 // If either the declaration has a dependent type or if any of the 5438 // expressions is type-dependent, we represent the initialization 5439 // via a ParenListExpr for later use during template instantiation. 5440 if (VDecl->getType()->isDependentType() || 5441 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5442 // Let clients know that initialization was done with a direct initializer. 5443 VDecl->setCXXDirectInitializer(true); 5444 5445 // Store the initialization expressions as a ParenListExpr. 5446 unsigned NumExprs = Exprs.size(); 5447 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5448 (Expr **)Exprs.release(), 5449 NumExprs, RParenLoc)); 5450 return; 5451 } 5452 5453 // Capture the variable that is being initialized and the style of 5454 // initialization. 5455 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5456 5457 // FIXME: Poor source location information. 5458 InitializationKind Kind 5459 = InitializationKind::CreateDirect(VDecl->getLocation(), 5460 LParenLoc, RParenLoc); 5461 5462 InitializationSequence InitSeq(*this, Entity, Kind, 5463 (Expr**)Exprs.get(), Exprs.size()); 5464 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5465 if (Result.isInvalid()) { 5466 VDecl->setInvalidDecl(); 5467 return; 5468 } 5469 5470 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 5471 VDecl->setInit(Result.takeAs<Expr>()); 5472 VDecl->setCXXDirectInitializer(true); 5473 5474 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5475 FinalizeVarWithDestructor(VDecl, Record); 5476} 5477 5478/// \brief Given a constructor and the set of arguments provided for the 5479/// constructor, convert the arguments and add any required default arguments 5480/// to form a proper call to this constructor. 5481/// 5482/// \returns true if an error occurred, false otherwise. 5483bool 5484Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5485 MultiExprArg ArgsPtr, 5486 SourceLocation Loc, 5487 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 5488 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5489 unsigned NumArgs = ArgsPtr.size(); 5490 Expr **Args = (Expr **)ArgsPtr.get(); 5491 5492 const FunctionProtoType *Proto 5493 = Constructor->getType()->getAs<FunctionProtoType>(); 5494 assert(Proto && "Constructor without a prototype?"); 5495 unsigned NumArgsInProto = Proto->getNumArgs(); 5496 5497 // If too few arguments are available, we'll fill in the rest with defaults. 5498 if (NumArgs < NumArgsInProto) 5499 ConvertedArgs.reserve(NumArgsInProto); 5500 else 5501 ConvertedArgs.reserve(NumArgs); 5502 5503 VariadicCallType CallType = 5504 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5505 llvm::SmallVector<Expr *, 8> AllArgs; 5506 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5507 Proto, 0, Args, NumArgs, AllArgs, 5508 CallType); 5509 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5510 ConvertedArgs.push_back(AllArgs[i]); 5511 return Invalid; 5512} 5513 5514static inline bool 5515CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5516 const FunctionDecl *FnDecl) { 5517 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 5518 if (isa<NamespaceDecl>(DC)) { 5519 return SemaRef.Diag(FnDecl->getLocation(), 5520 diag::err_operator_new_delete_declared_in_namespace) 5521 << FnDecl->getDeclName(); 5522 } 5523 5524 if (isa<TranslationUnitDecl>(DC) && 5525 FnDecl->getStorageClass() == FunctionDecl::Static) { 5526 return SemaRef.Diag(FnDecl->getLocation(), 5527 diag::err_operator_new_delete_declared_static) 5528 << FnDecl->getDeclName(); 5529 } 5530 5531 return false; 5532} 5533 5534static inline bool 5535CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5536 CanQualType ExpectedResultType, 5537 CanQualType ExpectedFirstParamType, 5538 unsigned DependentParamTypeDiag, 5539 unsigned InvalidParamTypeDiag) { 5540 QualType ResultType = 5541 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5542 5543 // Check that the result type is not dependent. 5544 if (ResultType->isDependentType()) 5545 return SemaRef.Diag(FnDecl->getLocation(), 5546 diag::err_operator_new_delete_dependent_result_type) 5547 << FnDecl->getDeclName() << ExpectedResultType; 5548 5549 // Check that the result type is what we expect. 5550 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5551 return SemaRef.Diag(FnDecl->getLocation(), 5552 diag::err_operator_new_delete_invalid_result_type) 5553 << FnDecl->getDeclName() << ExpectedResultType; 5554 5555 // A function template must have at least 2 parameters. 5556 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5557 return SemaRef.Diag(FnDecl->getLocation(), 5558 diag::err_operator_new_delete_template_too_few_parameters) 5559 << FnDecl->getDeclName(); 5560 5561 // The function decl must have at least 1 parameter. 5562 if (FnDecl->getNumParams() == 0) 5563 return SemaRef.Diag(FnDecl->getLocation(), 5564 diag::err_operator_new_delete_too_few_parameters) 5565 << FnDecl->getDeclName(); 5566 5567 // Check the the first parameter type is not dependent. 5568 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5569 if (FirstParamType->isDependentType()) 5570 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5571 << FnDecl->getDeclName() << ExpectedFirstParamType; 5572 5573 // Check that the first parameter type is what we expect. 5574 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5575 ExpectedFirstParamType) 5576 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5577 << FnDecl->getDeclName() << ExpectedFirstParamType; 5578 5579 return false; 5580} 5581 5582static bool 5583CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5584 // C++ [basic.stc.dynamic.allocation]p1: 5585 // A program is ill-formed if an allocation function is declared in a 5586 // namespace scope other than global scope or declared static in global 5587 // scope. 5588 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5589 return true; 5590 5591 CanQualType SizeTy = 5592 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5593 5594 // C++ [basic.stc.dynamic.allocation]p1: 5595 // The return type shall be void*. The first parameter shall have type 5596 // std::size_t. 5597 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5598 SizeTy, 5599 diag::err_operator_new_dependent_param_type, 5600 diag::err_operator_new_param_type)) 5601 return true; 5602 5603 // C++ [basic.stc.dynamic.allocation]p1: 5604 // The first parameter shall not have an associated default argument. 5605 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5606 return SemaRef.Diag(FnDecl->getLocation(), 5607 diag::err_operator_new_default_arg) 5608 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5609 5610 return false; 5611} 5612 5613static bool 5614CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5615 // C++ [basic.stc.dynamic.deallocation]p1: 5616 // A program is ill-formed if deallocation functions are declared in a 5617 // namespace scope other than global scope or declared static in global 5618 // scope. 5619 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5620 return true; 5621 5622 // C++ [basic.stc.dynamic.deallocation]p2: 5623 // Each deallocation function shall return void and its first parameter 5624 // shall be void*. 5625 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5626 SemaRef.Context.VoidPtrTy, 5627 diag::err_operator_delete_dependent_param_type, 5628 diag::err_operator_delete_param_type)) 5629 return true; 5630 5631 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5632 if (FirstParamType->isDependentType()) 5633 return SemaRef.Diag(FnDecl->getLocation(), 5634 diag::err_operator_delete_dependent_param_type) 5635 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5636 5637 if (SemaRef.Context.getCanonicalType(FirstParamType) != 5638 SemaRef.Context.VoidPtrTy) 5639 return SemaRef.Diag(FnDecl->getLocation(), 5640 diag::err_operator_delete_param_type) 5641 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5642 5643 return false; 5644} 5645 5646/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5647/// of this overloaded operator is well-formed. If so, returns false; 5648/// otherwise, emits appropriate diagnostics and returns true. 5649bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5650 assert(FnDecl && FnDecl->isOverloadedOperator() && 5651 "Expected an overloaded operator declaration"); 5652 5653 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5654 5655 // C++ [over.oper]p5: 5656 // The allocation and deallocation functions, operator new, 5657 // operator new[], operator delete and operator delete[], are 5658 // described completely in 3.7.3. The attributes and restrictions 5659 // found in the rest of this subclause do not apply to them unless 5660 // explicitly stated in 3.7.3. 5661 if (Op == OO_Delete || Op == OO_Array_Delete) 5662 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5663 5664 if (Op == OO_New || Op == OO_Array_New) 5665 return CheckOperatorNewDeclaration(*this, FnDecl); 5666 5667 // C++ [over.oper]p6: 5668 // An operator function shall either be a non-static member 5669 // function or be a non-member function and have at least one 5670 // parameter whose type is a class, a reference to a class, an 5671 // enumeration, or a reference to an enumeration. 5672 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5673 if (MethodDecl->isStatic()) 5674 return Diag(FnDecl->getLocation(), 5675 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5676 } else { 5677 bool ClassOrEnumParam = false; 5678 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5679 ParamEnd = FnDecl->param_end(); 5680 Param != ParamEnd; ++Param) { 5681 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5682 if (ParamType->isDependentType() || ParamType->isRecordType() || 5683 ParamType->isEnumeralType()) { 5684 ClassOrEnumParam = true; 5685 break; 5686 } 5687 } 5688 5689 if (!ClassOrEnumParam) 5690 return Diag(FnDecl->getLocation(), 5691 diag::err_operator_overload_needs_class_or_enum) 5692 << FnDecl->getDeclName(); 5693 } 5694 5695 // C++ [over.oper]p8: 5696 // An operator function cannot have default arguments (8.3.6), 5697 // except where explicitly stated below. 5698 // 5699 // Only the function-call operator allows default arguments 5700 // (C++ [over.call]p1). 5701 if (Op != OO_Call) { 5702 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5703 Param != FnDecl->param_end(); ++Param) { 5704 if ((*Param)->hasDefaultArg()) 5705 return Diag((*Param)->getLocation(), 5706 diag::err_operator_overload_default_arg) 5707 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5708 } 5709 } 5710 5711 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5712 { false, false, false } 5713#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5714 , { Unary, Binary, MemberOnly } 5715#include "clang/Basic/OperatorKinds.def" 5716 }; 5717 5718 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5719 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5720 bool MustBeMemberOperator = OperatorUses[Op][2]; 5721 5722 // C++ [over.oper]p8: 5723 // [...] Operator functions cannot have more or fewer parameters 5724 // than the number required for the corresponding operator, as 5725 // described in the rest of this subclause. 5726 unsigned NumParams = FnDecl->getNumParams() 5727 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5728 if (Op != OO_Call && 5729 ((NumParams == 1 && !CanBeUnaryOperator) || 5730 (NumParams == 2 && !CanBeBinaryOperator) || 5731 (NumParams < 1) || (NumParams > 2))) { 5732 // We have the wrong number of parameters. 5733 unsigned ErrorKind; 5734 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5735 ErrorKind = 2; // 2 -> unary or binary. 5736 } else if (CanBeUnaryOperator) { 5737 ErrorKind = 0; // 0 -> unary 5738 } else { 5739 assert(CanBeBinaryOperator && 5740 "All non-call overloaded operators are unary or binary!"); 5741 ErrorKind = 1; // 1 -> binary 5742 } 5743 5744 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5745 << FnDecl->getDeclName() << NumParams << ErrorKind; 5746 } 5747 5748 // Overloaded operators other than operator() cannot be variadic. 5749 if (Op != OO_Call && 5750 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5751 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5752 << FnDecl->getDeclName(); 5753 } 5754 5755 // Some operators must be non-static member functions. 5756 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5757 return Diag(FnDecl->getLocation(), 5758 diag::err_operator_overload_must_be_member) 5759 << FnDecl->getDeclName(); 5760 } 5761 5762 // C++ [over.inc]p1: 5763 // The user-defined function called operator++ implements the 5764 // prefix and postfix ++ operator. If this function is a member 5765 // function with no parameters, or a non-member function with one 5766 // parameter of class or enumeration type, it defines the prefix 5767 // increment operator ++ for objects of that type. If the function 5768 // is a member function with one parameter (which shall be of type 5769 // int) or a non-member function with two parameters (the second 5770 // of which shall be of type int), it defines the postfix 5771 // increment operator ++ for objects of that type. 5772 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5773 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5774 bool ParamIsInt = false; 5775 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5776 ParamIsInt = BT->getKind() == BuiltinType::Int; 5777 5778 if (!ParamIsInt) 5779 return Diag(LastParam->getLocation(), 5780 diag::err_operator_overload_post_incdec_must_be_int) 5781 << LastParam->getType() << (Op == OO_MinusMinus); 5782 } 5783 5784 // Notify the class if it got an assignment operator. 5785 if (Op == OO_Equal) { 5786 // Would have returned earlier otherwise. 5787 assert(isa<CXXMethodDecl>(FnDecl) && 5788 "Overloaded = not member, but not filtered."); 5789 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5790 Method->getParent()->addedAssignmentOperator(Context, Method); 5791 } 5792 5793 return false; 5794} 5795 5796/// CheckLiteralOperatorDeclaration - Check whether the declaration 5797/// of this literal operator function is well-formed. If so, returns 5798/// false; otherwise, emits appropriate diagnostics and returns true. 5799bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5800 DeclContext *DC = FnDecl->getDeclContext(); 5801 Decl::Kind Kind = DC->getDeclKind(); 5802 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5803 Kind != Decl::LinkageSpec) { 5804 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5805 << FnDecl->getDeclName(); 5806 return true; 5807 } 5808 5809 bool Valid = false; 5810 5811 // template <char...> type operator "" name() is the only valid template 5812 // signature, and the only valid signature with no parameters. 5813 if (FnDecl->param_size() == 0) { 5814 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5815 // Must have only one template parameter 5816 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5817 if (Params->size() == 1) { 5818 NonTypeTemplateParmDecl *PmDecl = 5819 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5820 5821 // The template parameter must be a char parameter pack. 5822 // FIXME: This test will always fail because non-type parameter packs 5823 // have not been implemented. 5824 if (PmDecl && PmDecl->isTemplateParameterPack() && 5825 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5826 Valid = true; 5827 } 5828 } 5829 } else { 5830 // Check the first parameter 5831 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5832 5833 QualType T = (*Param)->getType(); 5834 5835 // unsigned long long int, long double, and any character type are allowed 5836 // as the only parameters. 5837 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5838 Context.hasSameType(T, Context.LongDoubleTy) || 5839 Context.hasSameType(T, Context.CharTy) || 5840 Context.hasSameType(T, Context.WCharTy) || 5841 Context.hasSameType(T, Context.Char16Ty) || 5842 Context.hasSameType(T, Context.Char32Ty)) { 5843 if (++Param == FnDecl->param_end()) 5844 Valid = true; 5845 goto FinishedParams; 5846 } 5847 5848 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5849 const PointerType *PT = T->getAs<PointerType>(); 5850 if (!PT) 5851 goto FinishedParams; 5852 T = PT->getPointeeType(); 5853 if (!T.isConstQualified()) 5854 goto FinishedParams; 5855 T = T.getUnqualifiedType(); 5856 5857 // Move on to the second parameter; 5858 ++Param; 5859 5860 // If there is no second parameter, the first must be a const char * 5861 if (Param == FnDecl->param_end()) { 5862 if (Context.hasSameType(T, Context.CharTy)) 5863 Valid = true; 5864 goto FinishedParams; 5865 } 5866 5867 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5868 // are allowed as the first parameter to a two-parameter function 5869 if (!(Context.hasSameType(T, Context.CharTy) || 5870 Context.hasSameType(T, Context.WCharTy) || 5871 Context.hasSameType(T, Context.Char16Ty) || 5872 Context.hasSameType(T, Context.Char32Ty))) 5873 goto FinishedParams; 5874 5875 // The second and final parameter must be an std::size_t 5876 T = (*Param)->getType().getUnqualifiedType(); 5877 if (Context.hasSameType(T, Context.getSizeType()) && 5878 ++Param == FnDecl->param_end()) 5879 Valid = true; 5880 } 5881 5882 // FIXME: This diagnostic is absolutely terrible. 5883FinishedParams: 5884 if (!Valid) { 5885 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5886 << FnDecl->getDeclName(); 5887 return true; 5888 } 5889 5890 return false; 5891} 5892 5893/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5894/// linkage specification, including the language and (if present) 5895/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5896/// the location of the language string literal, which is provided 5897/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5898/// the '{' brace. Otherwise, this linkage specification does not 5899/// have any braces. 5900Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5901 SourceLocation ExternLoc, 5902 SourceLocation LangLoc, 5903 llvm::StringRef Lang, 5904 SourceLocation LBraceLoc) { 5905 LinkageSpecDecl::LanguageIDs Language; 5906 if (Lang == "\"C\"") 5907 Language = LinkageSpecDecl::lang_c; 5908 else if (Lang == "\"C++\"") 5909 Language = LinkageSpecDecl::lang_cxx; 5910 else { 5911 Diag(LangLoc, diag::err_bad_language); 5912 return DeclPtrTy(); 5913 } 5914 5915 // FIXME: Add all the various semantics of linkage specifications 5916 5917 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5918 LangLoc, Language, 5919 LBraceLoc.isValid()); 5920 CurContext->addDecl(D); 5921 PushDeclContext(S, D); 5922 return DeclPtrTy::make(D); 5923} 5924 5925/// ActOnFinishLinkageSpecification - Completely the definition of 5926/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5927/// valid, it's the position of the closing '}' brace in a linkage 5928/// specification that uses braces. 5929Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5930 DeclPtrTy LinkageSpec, 5931 SourceLocation RBraceLoc) { 5932 if (LinkageSpec) 5933 PopDeclContext(); 5934 return LinkageSpec; 5935} 5936 5937/// \brief Perform semantic analysis for the variable declaration that 5938/// occurs within a C++ catch clause, returning the newly-created 5939/// variable. 5940VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5941 TypeSourceInfo *TInfo, 5942 IdentifierInfo *Name, 5943 SourceLocation Loc, 5944 SourceRange Range) { 5945 bool Invalid = false; 5946 5947 // Arrays and functions decay. 5948 if (ExDeclType->isArrayType()) 5949 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5950 else if (ExDeclType->isFunctionType()) 5951 ExDeclType = Context.getPointerType(ExDeclType); 5952 5953 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5954 // The exception-declaration shall not denote a pointer or reference to an 5955 // incomplete type, other than [cv] void*. 5956 // N2844 forbids rvalue references. 5957 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5958 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5959 Invalid = true; 5960 } 5961 5962 // GCC allows catching pointers and references to incomplete types 5963 // as an extension; so do we, but we warn by default. 5964 5965 QualType BaseType = ExDeclType; 5966 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5967 unsigned DK = diag::err_catch_incomplete; 5968 bool IncompleteCatchIsInvalid = true; 5969 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5970 BaseType = Ptr->getPointeeType(); 5971 Mode = 1; 5972 DK = diag::ext_catch_incomplete_ptr; 5973 IncompleteCatchIsInvalid = false; 5974 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5975 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5976 BaseType = Ref->getPointeeType(); 5977 Mode = 2; 5978 DK = diag::ext_catch_incomplete_ref; 5979 IncompleteCatchIsInvalid = false; 5980 } 5981 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5982 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5983 IncompleteCatchIsInvalid) 5984 Invalid = true; 5985 5986 if (!Invalid && !ExDeclType->isDependentType() && 5987 RequireNonAbstractType(Loc, ExDeclType, 5988 diag::err_abstract_type_in_decl, 5989 AbstractVariableType)) 5990 Invalid = true; 5991 5992 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5993 Name, ExDeclType, TInfo, VarDecl::None, 5994 VarDecl::None); 5995 ExDecl->setExceptionVariable(true); 5996 5997 if (!Invalid) { 5998 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5999 // C++ [except.handle]p16: 6000 // The object declared in an exception-declaration or, if the 6001 // exception-declaration does not specify a name, a temporary (12.2) is 6002 // copy-initialized (8.5) from the exception object. [...] 6003 // The object is destroyed when the handler exits, after the destruction 6004 // of any automatic objects initialized within the handler. 6005 // 6006 // We just pretend to initialize the object with itself, then make sure 6007 // it can be destroyed later. 6008 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6009 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6010 Loc, ExDeclType, 0); 6011 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6012 SourceLocation()); 6013 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6014 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6015 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 6016 if (Result.isInvalid()) 6017 Invalid = true; 6018 else 6019 FinalizeVarWithDestructor(ExDecl, RecordTy); 6020 } 6021 } 6022 6023 if (Invalid) 6024 ExDecl->setInvalidDecl(); 6025 6026 return ExDecl; 6027} 6028 6029/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6030/// handler. 6031Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6032 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6033 QualType ExDeclType = TInfo->getType(); 6034 6035 bool Invalid = D.isInvalidType(); 6036 IdentifierInfo *II = D.getIdentifier(); 6037 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6038 LookupOrdinaryName, 6039 ForRedeclaration)) { 6040 // The scope should be freshly made just for us. There is just no way 6041 // it contains any previous declaration. 6042 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 6043 if (PrevDecl->isTemplateParameter()) { 6044 // Maybe we will complain about the shadowed template parameter. 6045 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6046 } 6047 } 6048 6049 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6050 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6051 << D.getCXXScopeSpec().getRange(); 6052 Invalid = true; 6053 } 6054 6055 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 6056 D.getIdentifier(), 6057 D.getIdentifierLoc(), 6058 D.getDeclSpec().getSourceRange()); 6059 6060 if (Invalid) 6061 ExDecl->setInvalidDecl(); 6062 6063 // Add the exception declaration into this scope. 6064 if (II) 6065 PushOnScopeChains(ExDecl, S); 6066 else 6067 CurContext->addDecl(ExDecl); 6068 6069 ProcessDeclAttributes(S, ExDecl, D); 6070 return DeclPtrTy::make(ExDecl); 6071} 6072 6073Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6074 ExprArg assertexpr, 6075 ExprArg assertmessageexpr) { 6076 Expr *AssertExpr = (Expr *)assertexpr.get(); 6077 StringLiteral *AssertMessage = 6078 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 6079 6080 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6081 llvm::APSInt Value(32); 6082 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6083 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6084 AssertExpr->getSourceRange(); 6085 return DeclPtrTy(); 6086 } 6087 6088 if (Value == 0) { 6089 Diag(AssertLoc, diag::err_static_assert_failed) 6090 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6091 } 6092 } 6093 6094 assertexpr.release(); 6095 assertmessageexpr.release(); 6096 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6097 AssertExpr, AssertMessage); 6098 6099 CurContext->addDecl(Decl); 6100 return DeclPtrTy::make(Decl); 6101} 6102 6103/// \brief Perform semantic analysis of the given friend type declaration. 6104/// 6105/// \returns A friend declaration that. 6106FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6107 TypeSourceInfo *TSInfo) { 6108 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6109 6110 QualType T = TSInfo->getType(); 6111 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6112 6113 if (!getLangOptions().CPlusPlus0x) { 6114 // C++03 [class.friend]p2: 6115 // An elaborated-type-specifier shall be used in a friend declaration 6116 // for a class.* 6117 // 6118 // * The class-key of the elaborated-type-specifier is required. 6119 if (!ActiveTemplateInstantiations.empty()) { 6120 // Do not complain about the form of friend template types during 6121 // template instantiation; we will already have complained when the 6122 // template was declared. 6123 } else if (!T->isElaboratedTypeSpecifier()) { 6124 // If we evaluated the type to a record type, suggest putting 6125 // a tag in front. 6126 if (const RecordType *RT = T->getAs<RecordType>()) { 6127 RecordDecl *RD = RT->getDecl(); 6128 6129 std::string InsertionText = std::string(" ") + RD->getKindName(); 6130 6131 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6132 << (unsigned) RD->getTagKind() 6133 << T 6134 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6135 InsertionText); 6136 } else { 6137 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6138 << T 6139 << SourceRange(FriendLoc, TypeRange.getEnd()); 6140 } 6141 } else if (T->getAs<EnumType>()) { 6142 Diag(FriendLoc, diag::ext_enum_friend) 6143 << T 6144 << SourceRange(FriendLoc, TypeRange.getEnd()); 6145 } 6146 } 6147 6148 // C++0x [class.friend]p3: 6149 // If the type specifier in a friend declaration designates a (possibly 6150 // cv-qualified) class type, that class is declared as a friend; otherwise, 6151 // the friend declaration is ignored. 6152 6153 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6154 // in [class.friend]p3 that we do not implement. 6155 6156 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6157} 6158 6159/// Handle a friend type declaration. This works in tandem with 6160/// ActOnTag. 6161/// 6162/// Notes on friend class templates: 6163/// 6164/// We generally treat friend class declarations as if they were 6165/// declaring a class. So, for example, the elaborated type specifier 6166/// in a friend declaration is required to obey the restrictions of a 6167/// class-head (i.e. no typedefs in the scope chain), template 6168/// parameters are required to match up with simple template-ids, &c. 6169/// However, unlike when declaring a template specialization, it's 6170/// okay to refer to a template specialization without an empty 6171/// template parameter declaration, e.g. 6172/// friend class A<T>::B<unsigned>; 6173/// We permit this as a special case; if there are any template 6174/// parameters present at all, require proper matching, i.e. 6175/// template <> template <class T> friend class A<int>::B; 6176Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6177 MultiTemplateParamsArg TempParams) { 6178 SourceLocation Loc = DS.getSourceRange().getBegin(); 6179 6180 assert(DS.isFriendSpecified()); 6181 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6182 6183 // Try to convert the decl specifier to a type. This works for 6184 // friend templates because ActOnTag never produces a ClassTemplateDecl 6185 // for a TUK_Friend. 6186 Declarator TheDeclarator(DS, Declarator::MemberContext); 6187 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6188 QualType T = TSI->getType(); 6189 if (TheDeclarator.isInvalidType()) 6190 return DeclPtrTy(); 6191 6192 // This is definitely an error in C++98. It's probably meant to 6193 // be forbidden in C++0x, too, but the specification is just 6194 // poorly written. 6195 // 6196 // The problem is with declarations like the following: 6197 // template <T> friend A<T>::foo; 6198 // where deciding whether a class C is a friend or not now hinges 6199 // on whether there exists an instantiation of A that causes 6200 // 'foo' to equal C. There are restrictions on class-heads 6201 // (which we declare (by fiat) elaborated friend declarations to 6202 // be) that makes this tractable. 6203 // 6204 // FIXME: handle "template <> friend class A<T>;", which 6205 // is possibly well-formed? Who even knows? 6206 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6207 Diag(Loc, diag::err_tagless_friend_type_template) 6208 << DS.getSourceRange(); 6209 return DeclPtrTy(); 6210 } 6211 6212 // C++98 [class.friend]p1: A friend of a class is a function 6213 // or class that is not a member of the class . . . 6214 // This is fixed in DR77, which just barely didn't make the C++03 6215 // deadline. It's also a very silly restriction that seriously 6216 // affects inner classes and which nobody else seems to implement; 6217 // thus we never diagnose it, not even in -pedantic. 6218 // 6219 // But note that we could warn about it: it's always useless to 6220 // friend one of your own members (it's not, however, worthless to 6221 // friend a member of an arbitrary specialization of your template). 6222 6223 Decl *D; 6224 if (unsigned NumTempParamLists = TempParams.size()) 6225 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6226 NumTempParamLists, 6227 (TemplateParameterList**) TempParams.release(), 6228 TSI, 6229 DS.getFriendSpecLoc()); 6230 else 6231 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6232 6233 if (!D) 6234 return DeclPtrTy(); 6235 6236 D->setAccess(AS_public); 6237 CurContext->addDecl(D); 6238 6239 return DeclPtrTy::make(D); 6240} 6241 6242Sema::DeclPtrTy 6243Sema::ActOnFriendFunctionDecl(Scope *S, 6244 Declarator &D, 6245 bool IsDefinition, 6246 MultiTemplateParamsArg TemplateParams) { 6247 const DeclSpec &DS = D.getDeclSpec(); 6248 6249 assert(DS.isFriendSpecified()); 6250 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6251 6252 SourceLocation Loc = D.getIdentifierLoc(); 6253 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6254 QualType T = TInfo->getType(); 6255 6256 // C++ [class.friend]p1 6257 // A friend of a class is a function or class.... 6258 // Note that this sees through typedefs, which is intended. 6259 // It *doesn't* see through dependent types, which is correct 6260 // according to [temp.arg.type]p3: 6261 // If a declaration acquires a function type through a 6262 // type dependent on a template-parameter and this causes 6263 // a declaration that does not use the syntactic form of a 6264 // function declarator to have a function type, the program 6265 // is ill-formed. 6266 if (!T->isFunctionType()) { 6267 Diag(Loc, diag::err_unexpected_friend); 6268 6269 // It might be worthwhile to try to recover by creating an 6270 // appropriate declaration. 6271 return DeclPtrTy(); 6272 } 6273 6274 // C++ [namespace.memdef]p3 6275 // - If a friend declaration in a non-local class first declares a 6276 // class or function, the friend class or function is a member 6277 // of the innermost enclosing namespace. 6278 // - The name of the friend is not found by simple name lookup 6279 // until a matching declaration is provided in that namespace 6280 // scope (either before or after the class declaration granting 6281 // friendship). 6282 // - If a friend function is called, its name may be found by the 6283 // name lookup that considers functions from namespaces and 6284 // classes associated with the types of the function arguments. 6285 // - When looking for a prior declaration of a class or a function 6286 // declared as a friend, scopes outside the innermost enclosing 6287 // namespace scope are not considered. 6288 6289 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 6290 DeclarationName Name = GetNameForDeclarator(D); 6291 assert(Name); 6292 6293 // The context we found the declaration in, or in which we should 6294 // create the declaration. 6295 DeclContext *DC; 6296 6297 // FIXME: handle local classes 6298 6299 // Recover from invalid scope qualifiers as if they just weren't there. 6300 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 6301 ForRedeclaration); 6302 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 6303 DC = computeDeclContext(ScopeQual); 6304 6305 // FIXME: handle dependent contexts 6306 if (!DC) return DeclPtrTy(); 6307 if (RequireCompleteDeclContext(ScopeQual, DC)) return DeclPtrTy(); 6308 6309 LookupQualifiedName(Previous, DC); 6310 6311 // Ignore things found implicitly in the wrong scope. 6312 // TODO: better diagnostics for this case. Suggesting the right 6313 // qualified scope would be nice... 6314 LookupResult::Filter F = Previous.makeFilter(); 6315 while (F.hasNext()) { 6316 NamedDecl *D = F.next(); 6317 if (!D->getDeclContext()->getLookupContext()->Equals(DC)) 6318 F.erase(); 6319 } 6320 F.done(); 6321 6322 if (Previous.empty()) { 6323 D.setInvalidType(); 6324 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6325 return DeclPtrTy(); 6326 } 6327 6328 // C++ [class.friend]p1: A friend of a class is a function or 6329 // class that is not a member of the class . . . 6330 if (DC->Equals(CurContext)) 6331 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6332 6333 // Otherwise walk out to the nearest namespace scope looking for matches. 6334 } else { 6335 // TODO: handle local class contexts. 6336 6337 DC = CurContext; 6338 while (true) { 6339 // Skip class contexts. If someone can cite chapter and verse 6340 // for this behavior, that would be nice --- it's what GCC and 6341 // EDG do, and it seems like a reasonable intent, but the spec 6342 // really only says that checks for unqualified existing 6343 // declarations should stop at the nearest enclosing namespace, 6344 // not that they should only consider the nearest enclosing 6345 // namespace. 6346 while (DC->isRecord()) 6347 DC = DC->getParent(); 6348 6349 LookupQualifiedName(Previous, DC); 6350 6351 // TODO: decide what we think about using declarations. 6352 if (!Previous.empty()) 6353 break; 6354 6355 if (DC->isFileContext()) break; 6356 DC = DC->getParent(); 6357 } 6358 6359 // C++ [class.friend]p1: A friend of a class is a function or 6360 // class that is not a member of the class . . . 6361 // C++0x changes this for both friend types and functions. 6362 // Most C++ 98 compilers do seem to give an error here, so 6363 // we do, too. 6364 if (!Previous.empty() && DC->Equals(CurContext) 6365 && !getLangOptions().CPlusPlus0x) 6366 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6367 } 6368 6369 if (DC->isFileContext()) { 6370 // This implies that it has to be an operator or function. 6371 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6372 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6373 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6374 Diag(Loc, diag::err_introducing_special_friend) << 6375 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6376 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6377 return DeclPtrTy(); 6378 } 6379 } 6380 6381 bool Redeclaration = false; 6382 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 6383 move(TemplateParams), 6384 IsDefinition, 6385 Redeclaration); 6386 if (!ND) return DeclPtrTy(); 6387 6388 assert(ND->getDeclContext() == DC); 6389 assert(ND->getLexicalDeclContext() == CurContext); 6390 6391 // Add the function declaration to the appropriate lookup tables, 6392 // adjusting the redeclarations list as necessary. We don't 6393 // want to do this yet if the friending class is dependent. 6394 // 6395 // Also update the scope-based lookup if the target context's 6396 // lookup context is in lexical scope. 6397 if (!CurContext->isDependentContext()) { 6398 DC = DC->getLookupContext(); 6399 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6400 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6401 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6402 } 6403 6404 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6405 D.getIdentifierLoc(), ND, 6406 DS.getFriendSpecLoc()); 6407 FrD->setAccess(AS_public); 6408 CurContext->addDecl(FrD); 6409 6410 return DeclPtrTy::make(ND); 6411} 6412 6413void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 6414 AdjustDeclIfTemplate(dcl); 6415 6416 Decl *Dcl = dcl.getAs<Decl>(); 6417 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6418 if (!Fn) { 6419 Diag(DelLoc, diag::err_deleted_non_function); 6420 return; 6421 } 6422 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6423 Diag(DelLoc, diag::err_deleted_decl_not_first); 6424 Diag(Prev->getLocation(), diag::note_previous_declaration); 6425 // If the declaration wasn't the first, we delete the function anyway for 6426 // recovery. 6427 } 6428 Fn->setDeleted(); 6429} 6430 6431static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6432 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6433 ++CI) { 6434 Stmt *SubStmt = *CI; 6435 if (!SubStmt) 6436 continue; 6437 if (isa<ReturnStmt>(SubStmt)) 6438 Self.Diag(SubStmt->getSourceRange().getBegin(), 6439 diag::err_return_in_constructor_handler); 6440 if (!isa<Expr>(SubStmt)) 6441 SearchForReturnInStmt(Self, SubStmt); 6442 } 6443} 6444 6445void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6446 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6447 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6448 SearchForReturnInStmt(*this, Handler); 6449 } 6450} 6451 6452bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6453 const CXXMethodDecl *Old) { 6454 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6455 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6456 6457 if (Context.hasSameType(NewTy, OldTy) || 6458 NewTy->isDependentType() || OldTy->isDependentType()) 6459 return false; 6460 6461 // Check if the return types are covariant 6462 QualType NewClassTy, OldClassTy; 6463 6464 /// Both types must be pointers or references to classes. 6465 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6466 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6467 NewClassTy = NewPT->getPointeeType(); 6468 OldClassTy = OldPT->getPointeeType(); 6469 } 6470 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6471 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6472 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6473 NewClassTy = NewRT->getPointeeType(); 6474 OldClassTy = OldRT->getPointeeType(); 6475 } 6476 } 6477 } 6478 6479 // The return types aren't either both pointers or references to a class type. 6480 if (NewClassTy.isNull()) { 6481 Diag(New->getLocation(), 6482 diag::err_different_return_type_for_overriding_virtual_function) 6483 << New->getDeclName() << NewTy << OldTy; 6484 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6485 6486 return true; 6487 } 6488 6489 // C++ [class.virtual]p6: 6490 // If the return type of D::f differs from the return type of B::f, the 6491 // class type in the return type of D::f shall be complete at the point of 6492 // declaration of D::f or shall be the class type D. 6493 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6494 if (!RT->isBeingDefined() && 6495 RequireCompleteType(New->getLocation(), NewClassTy, 6496 PDiag(diag::err_covariant_return_incomplete) 6497 << New->getDeclName())) 6498 return true; 6499 } 6500 6501 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6502 // Check if the new class derives from the old class. 6503 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6504 Diag(New->getLocation(), 6505 diag::err_covariant_return_not_derived) 6506 << New->getDeclName() << NewTy << OldTy; 6507 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6508 return true; 6509 } 6510 6511 // Check if we the conversion from derived to base is valid. 6512 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6513 diag::err_covariant_return_inaccessible_base, 6514 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6515 // FIXME: Should this point to the return type? 6516 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6517 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6518 return true; 6519 } 6520 } 6521 6522 // The qualifiers of the return types must be the same. 6523 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6524 Diag(New->getLocation(), 6525 diag::err_covariant_return_type_different_qualifications) 6526 << New->getDeclName() << NewTy << OldTy; 6527 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6528 return true; 6529 }; 6530 6531 6532 // The new class type must have the same or less qualifiers as the old type. 6533 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6534 Diag(New->getLocation(), 6535 diag::err_covariant_return_type_class_type_more_qualified) 6536 << New->getDeclName() << NewTy << OldTy; 6537 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6538 return true; 6539 }; 6540 6541 return false; 6542} 6543 6544bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6545 const CXXMethodDecl *Old) 6546{ 6547 if (Old->hasAttr<FinalAttr>()) { 6548 Diag(New->getLocation(), diag::err_final_function_overridden) 6549 << New->getDeclName(); 6550 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6551 return true; 6552 } 6553 6554 return false; 6555} 6556 6557/// \brief Mark the given method pure. 6558/// 6559/// \param Method the method to be marked pure. 6560/// 6561/// \param InitRange the source range that covers the "0" initializer. 6562bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6563 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6564 Method->setPure(); 6565 6566 // A class is abstract if at least one function is pure virtual. 6567 Method->getParent()->setAbstract(true); 6568 return false; 6569 } 6570 6571 if (!Method->isInvalidDecl()) 6572 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6573 << Method->getDeclName() << InitRange; 6574 return true; 6575} 6576 6577/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6578/// an initializer for the out-of-line declaration 'Dcl'. The scope 6579/// is a fresh scope pushed for just this purpose. 6580/// 6581/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6582/// static data member of class X, names should be looked up in the scope of 6583/// class X. 6584void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6585 // If there is no declaration, there was an error parsing it. 6586 Decl *D = Dcl.getAs<Decl>(); 6587 if (D == 0) return; 6588 6589 // We should only get called for declarations with scope specifiers, like: 6590 // int foo::bar; 6591 assert(D->isOutOfLine()); 6592 EnterDeclaratorContext(S, D->getDeclContext()); 6593} 6594 6595/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6596/// initializer for the out-of-line declaration 'Dcl'. 6597void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6598 // If there is no declaration, there was an error parsing it. 6599 Decl *D = Dcl.getAs<Decl>(); 6600 if (D == 0) return; 6601 6602 assert(D->isOutOfLine()); 6603 ExitDeclaratorContext(S); 6604} 6605 6606/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6607/// C++ if/switch/while/for statement. 6608/// e.g: "if (int x = f()) {...}" 6609Action::DeclResult 6610Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6611 // C++ 6.4p2: 6612 // The declarator shall not specify a function or an array. 6613 // The type-specifier-seq shall not contain typedef and shall not declare a 6614 // new class or enumeration. 6615 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6616 "Parser allowed 'typedef' as storage class of condition decl."); 6617 6618 TagDecl *OwnedTag = 0; 6619 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6620 QualType Ty = TInfo->getType(); 6621 6622 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6623 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6624 // would be created and CXXConditionDeclExpr wants a VarDecl. 6625 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6626 << D.getSourceRange(); 6627 return DeclResult(); 6628 } else if (OwnedTag && OwnedTag->isDefinition()) { 6629 // The type-specifier-seq shall not declare a new class or enumeration. 6630 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6631 } 6632 6633 DeclPtrTy Dcl = ActOnDeclarator(S, D); 6634 if (!Dcl) 6635 return DeclResult(); 6636 6637 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 6638 VD->setDeclaredInCondition(true); 6639 return Dcl; 6640} 6641 6642void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6643 bool DefinitionRequired) { 6644 // Ignore any vtable uses in unevaluated operands or for classes that do 6645 // not have a vtable. 6646 if (!Class->isDynamicClass() || Class->isDependentContext() || 6647 CurContext->isDependentContext() || 6648 ExprEvalContexts.back().Context == Unevaluated) 6649 return; 6650 6651 // Try to insert this class into the map. 6652 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6653 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6654 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6655 if (!Pos.second) { 6656 // If we already had an entry, check to see if we are promoting this vtable 6657 // to required a definition. If so, we need to reappend to the VTableUses 6658 // list, since we may have already processed the first entry. 6659 if (DefinitionRequired && !Pos.first->second) { 6660 Pos.first->second = true; 6661 } else { 6662 // Otherwise, we can early exit. 6663 return; 6664 } 6665 } 6666 6667 // Local classes need to have their virtual members marked 6668 // immediately. For all other classes, we mark their virtual members 6669 // at the end of the translation unit. 6670 if (Class->isLocalClass()) 6671 MarkVirtualMembersReferenced(Loc, Class); 6672 else 6673 VTableUses.push_back(std::make_pair(Class, Loc)); 6674} 6675 6676bool Sema::DefineUsedVTables() { 6677 // If any dynamic classes have their key function defined within 6678 // this translation unit, then those vtables are considered "used" and must 6679 // be emitted. 6680 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6681 if (const CXXMethodDecl *KeyFunction 6682 = Context.getKeyFunction(DynamicClasses[I])) { 6683 const FunctionDecl *Definition = 0; 6684 if (KeyFunction->getBody(Definition)) 6685 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6686 } 6687 } 6688 6689 if (VTableUses.empty()) 6690 return false; 6691 6692 // Note: The VTableUses vector could grow as a result of marking 6693 // the members of a class as "used", so we check the size each 6694 // time through the loop and prefer indices (with are stable) to 6695 // iterators (which are not). 6696 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6697 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6698 if (!Class) 6699 continue; 6700 6701 SourceLocation Loc = VTableUses[I].second; 6702 6703 // If this class has a key function, but that key function is 6704 // defined in another translation unit, we don't need to emit the 6705 // vtable even though we're using it. 6706 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6707 if (KeyFunction && !KeyFunction->getBody()) { 6708 switch (KeyFunction->getTemplateSpecializationKind()) { 6709 case TSK_Undeclared: 6710 case TSK_ExplicitSpecialization: 6711 case TSK_ExplicitInstantiationDeclaration: 6712 // The key function is in another translation unit. 6713 continue; 6714 6715 case TSK_ExplicitInstantiationDefinition: 6716 case TSK_ImplicitInstantiation: 6717 // We will be instantiating the key function. 6718 break; 6719 } 6720 } else if (!KeyFunction) { 6721 // If we have a class with no key function that is the subject 6722 // of an explicit instantiation declaration, suppress the 6723 // vtable; it will live with the explicit instantiation 6724 // definition. 6725 bool IsExplicitInstantiationDeclaration 6726 = Class->getTemplateSpecializationKind() 6727 == TSK_ExplicitInstantiationDeclaration; 6728 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6729 REnd = Class->redecls_end(); 6730 R != REnd; ++R) { 6731 TemplateSpecializationKind TSK 6732 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6733 if (TSK == TSK_ExplicitInstantiationDeclaration) 6734 IsExplicitInstantiationDeclaration = true; 6735 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6736 IsExplicitInstantiationDeclaration = false; 6737 break; 6738 } 6739 } 6740 6741 if (IsExplicitInstantiationDeclaration) 6742 continue; 6743 } 6744 6745 // Mark all of the virtual members of this class as referenced, so 6746 // that we can build a vtable. Then, tell the AST consumer that a 6747 // vtable for this class is required. 6748 MarkVirtualMembersReferenced(Loc, Class); 6749 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6750 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6751 6752 // Optionally warn if we're emitting a weak vtable. 6753 if (Class->getLinkage() == ExternalLinkage && 6754 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6755 if (!KeyFunction || (KeyFunction->getBody() && KeyFunction->isInlined())) 6756 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6757 } 6758 } 6759 VTableUses.clear(); 6760 6761 return true; 6762} 6763 6764void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6765 const CXXRecordDecl *RD) { 6766 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6767 e = RD->method_end(); i != e; ++i) { 6768 CXXMethodDecl *MD = *i; 6769 6770 // C++ [basic.def.odr]p2: 6771 // [...] A virtual member function is used if it is not pure. [...] 6772 if (MD->isVirtual() && !MD->isPure()) 6773 MarkDeclarationReferenced(Loc, MD); 6774 } 6775 6776 // Only classes that have virtual bases need a VTT. 6777 if (RD->getNumVBases() == 0) 6778 return; 6779 6780 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6781 e = RD->bases_end(); i != e; ++i) { 6782 const CXXRecordDecl *Base = 6783 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6784 if (i->isVirtual()) 6785 continue; 6786 if (Base->getNumVBases() == 0) 6787 continue; 6788 MarkVirtualMembersReferenced(Loc, Base); 6789 } 6790} 6791 6792/// SetIvarInitializers - This routine builds initialization ASTs for the 6793/// Objective-C implementation whose ivars need be initialized. 6794void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6795 if (!getLangOptions().CPlusPlus) 6796 return; 6797 if (const ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6798 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6799 CollectIvarsToConstructOrDestruct(OID, ivars); 6800 if (ivars.empty()) 6801 return; 6802 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6803 for (unsigned i = 0; i < ivars.size(); i++) { 6804 FieldDecl *Field = ivars[i]; 6805 if (Field->isInvalidDecl()) 6806 continue; 6807 6808 CXXBaseOrMemberInitializer *Member; 6809 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6810 InitializationKind InitKind = 6811 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6812 6813 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6814 Sema::OwningExprResult MemberInit = 6815 InitSeq.Perform(*this, InitEntity, InitKind, 6816 Sema::MultiExprArg(*this, 0, 0)); 6817 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 6818 // Note, MemberInit could actually come back empty if no initialization 6819 // is required (e.g., because it would call a trivial default constructor) 6820 if (!MemberInit.get() || MemberInit.isInvalid()) 6821 continue; 6822 6823 Member = 6824 new (Context) CXXBaseOrMemberInitializer(Context, 6825 Field, SourceLocation(), 6826 SourceLocation(), 6827 MemberInit.takeAs<Expr>(), 6828 SourceLocation()); 6829 AllToInit.push_back(Member); 6830 6831 // Be sure that the destructor is accessible and is marked as referenced. 6832 if (const RecordType *RecordTy 6833 = Context.getBaseElementType(Field->getType()) 6834 ->getAs<RecordType>()) { 6835 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6836 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 6837 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6838 CheckDestructorAccess(Field->getLocation(), Destructor, 6839 PDiag(diag::err_access_dtor_ivar) 6840 << Context.getBaseElementType(Field->getType())); 6841 } 6842 } 6843 } 6844 ObjCImplementation->setIvarInitializers(Context, 6845 AllToInit.data(), AllToInit.size()); 6846 } 6847} 6848