SemaDeclCXX.cpp revision ad00b7705f9bbee81beeac428e7c6587734ab5a6
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 } 1143 } 1144 1145 // If no results were found, try to correct typos. 1146 if (R.empty() && BaseType.isNull() && 1147 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1148 R.isSingleResult()) { 1149 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1150 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1151 // We have found a non-static data member with a similar 1152 // name to what was typed; complain and initialize that 1153 // member. 1154 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1155 << MemberOrBase << true << R.getLookupName() 1156 << FixItHint::CreateReplacement(R.getNameLoc(), 1157 R.getLookupName().getAsString()); 1158 Diag(Member->getLocation(), diag::note_previous_decl) 1159 << Member->getDeclName(); 1160 1161 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1162 LParenLoc, RParenLoc); 1163 } 1164 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1165 const CXXBaseSpecifier *DirectBaseSpec; 1166 const CXXBaseSpecifier *VirtualBaseSpec; 1167 if (FindBaseInitializer(*this, ClassDecl, 1168 Context.getTypeDeclType(Type), 1169 DirectBaseSpec, VirtualBaseSpec)) { 1170 // We have found a direct or virtual base class with a 1171 // similar name to what was typed; complain and initialize 1172 // that base class. 1173 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1174 << MemberOrBase << false << R.getLookupName() 1175 << FixItHint::CreateReplacement(R.getNameLoc(), 1176 R.getLookupName().getAsString()); 1177 1178 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1179 : VirtualBaseSpec; 1180 Diag(BaseSpec->getSourceRange().getBegin(), 1181 diag::note_base_class_specified_here) 1182 << BaseSpec->getType() 1183 << BaseSpec->getSourceRange(); 1184 1185 TyD = Type; 1186 } 1187 } 1188 } 1189 1190 if (!TyD && BaseType.isNull()) { 1191 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1192 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1193 return true; 1194 } 1195 } 1196 1197 if (BaseType.isNull()) { 1198 BaseType = Context.getTypeDeclType(TyD); 1199 if (SS.isSet()) { 1200 NestedNameSpecifier *Qualifier = 1201 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1202 1203 // FIXME: preserve source range information 1204 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1205 } 1206 } 1207 } 1208 1209 if (!TInfo) 1210 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1211 1212 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1213 LParenLoc, RParenLoc, ClassDecl); 1214} 1215 1216/// Checks an initializer expression for use of uninitialized fields, such as 1217/// containing the field that is being initialized. Returns true if there is an 1218/// uninitialized field was used an updates the SourceLocation parameter; false 1219/// otherwise. 1220static bool InitExprContainsUninitializedFields(const Stmt *S, 1221 const FieldDecl *LhsField, 1222 SourceLocation *L) { 1223 if (isa<CallExpr>(S)) { 1224 // Do not descend into function calls or constructors, as the use 1225 // of an uninitialized field may be valid. One would have to inspect 1226 // the contents of the function/ctor to determine if it is safe or not. 1227 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1228 // may be safe, depending on what the function/ctor does. 1229 return false; 1230 } 1231 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1232 const NamedDecl *RhsField = ME->getMemberDecl(); 1233 if (RhsField == LhsField) { 1234 // Initializing a field with itself. Throw a warning. 1235 // But wait; there are exceptions! 1236 // Exception #1: The field may not belong to this record. 1237 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1238 const Expr *base = ME->getBase(); 1239 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1240 // Even though the field matches, it does not belong to this record. 1241 return false; 1242 } 1243 // None of the exceptions triggered; return true to indicate an 1244 // uninitialized field was used. 1245 *L = ME->getMemberLoc(); 1246 return true; 1247 } 1248 } 1249 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1250 it != e; ++it) { 1251 if (!*it) { 1252 // An expression such as 'member(arg ?: "")' may trigger this. 1253 continue; 1254 } 1255 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1256 return true; 1257 } 1258 return false; 1259} 1260 1261Sema::MemInitResult 1262Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1263 unsigned NumArgs, SourceLocation IdLoc, 1264 SourceLocation LParenLoc, 1265 SourceLocation RParenLoc) { 1266 // Diagnose value-uses of fields to initialize themselves, e.g. 1267 // foo(foo) 1268 // where foo is not also a parameter to the constructor. 1269 // TODO: implement -Wuninitialized and fold this into that framework. 1270 for (unsigned i = 0; i < NumArgs; ++i) { 1271 SourceLocation L; 1272 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1273 // FIXME: Return true in the case when other fields are used before being 1274 // uninitialized. For example, let this field be the i'th field. When 1275 // initializing the i'th field, throw a warning if any of the >= i'th 1276 // fields are used, as they are not yet initialized. 1277 // Right now we are only handling the case where the i'th field uses 1278 // itself in its initializer. 1279 Diag(L, diag::warn_field_is_uninit); 1280 } 1281 } 1282 1283 bool HasDependentArg = false; 1284 for (unsigned i = 0; i < NumArgs; i++) 1285 HasDependentArg |= Args[i]->isTypeDependent(); 1286 1287 QualType FieldType = Member->getType(); 1288 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1289 FieldType = Array->getElementType(); 1290 if (FieldType->isDependentType() || HasDependentArg) { 1291 // Can't check initialization for a member of dependent type or when 1292 // any of the arguments are type-dependent expressions. 1293 OwningExprResult Init 1294 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1295 RParenLoc)); 1296 1297 // Erase any temporaries within this evaluation context; we're not 1298 // going to track them in the AST, since we'll be rebuilding the 1299 // ASTs during template instantiation. 1300 ExprTemporaries.erase( 1301 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1302 ExprTemporaries.end()); 1303 1304 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1305 LParenLoc, 1306 Init.takeAs<Expr>(), 1307 RParenLoc); 1308 1309 } 1310 1311 if (Member->isInvalidDecl()) 1312 return true; 1313 1314 // Initialize the member. 1315 InitializedEntity MemberEntity = 1316 InitializedEntity::InitializeMember(Member, 0); 1317 InitializationKind Kind = 1318 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1319 1320 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1321 1322 OwningExprResult MemberInit = 1323 InitSeq.Perform(*this, MemberEntity, Kind, 1324 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1325 if (MemberInit.isInvalid()) 1326 return true; 1327 1328 // C++0x [class.base.init]p7: 1329 // The initialization of each base and member constitutes a 1330 // full-expression. 1331 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1332 if (MemberInit.isInvalid()) 1333 return true; 1334 1335 // If we are in a dependent context, template instantiation will 1336 // perform this type-checking again. Just save the arguments that we 1337 // received in a ParenListExpr. 1338 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1339 // of the information that we have about the member 1340 // initializer. However, deconstructing the ASTs is a dicey process, 1341 // and this approach is far more likely to get the corner cases right. 1342 if (CurContext->isDependentContext()) { 1343 // Bump the reference count of all of the arguments. 1344 for (unsigned I = 0; I != NumArgs; ++I) 1345 Args[I]->Retain(); 1346 1347 OwningExprResult Init 1348 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1349 RParenLoc)); 1350 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1351 LParenLoc, 1352 Init.takeAs<Expr>(), 1353 RParenLoc); 1354 } 1355 1356 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1357 LParenLoc, 1358 MemberInit.takeAs<Expr>(), 1359 RParenLoc); 1360} 1361 1362Sema::MemInitResult 1363Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1364 Expr **Args, unsigned NumArgs, 1365 SourceLocation LParenLoc, SourceLocation RParenLoc, 1366 CXXRecordDecl *ClassDecl) { 1367 bool HasDependentArg = false; 1368 for (unsigned i = 0; i < NumArgs; i++) 1369 HasDependentArg |= Args[i]->isTypeDependent(); 1370 1371 SourceLocation BaseLoc = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1372 if (BaseType->isDependentType() || HasDependentArg) { 1373 // Can't check initialization for a base of dependent type or when 1374 // any of the arguments are type-dependent expressions. 1375 OwningExprResult BaseInit 1376 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1377 RParenLoc)); 1378 1379 // Erase any temporaries within this evaluation context; we're not 1380 // going to track them in the AST, since we'll be rebuilding the 1381 // ASTs during template instantiation. 1382 ExprTemporaries.erase( 1383 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1384 ExprTemporaries.end()); 1385 1386 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1387 /*IsVirtual=*/false, 1388 LParenLoc, 1389 BaseInit.takeAs<Expr>(), 1390 RParenLoc); 1391 } 1392 1393 if (!BaseType->isRecordType()) 1394 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1395 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1396 1397 // C++ [class.base.init]p2: 1398 // [...] Unless the mem-initializer-id names a nonstatic data 1399 // member of the constructor’s class or a direct or virtual base 1400 // of that class, the mem-initializer is ill-formed. A 1401 // mem-initializer-list can initialize a base class using any 1402 // name that denotes that base class type. 1403 1404 // Check for direct and virtual base classes. 1405 const CXXBaseSpecifier *DirectBaseSpec = 0; 1406 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1407 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1408 VirtualBaseSpec); 1409 1410 // C++ [base.class.init]p2: 1411 // If a mem-initializer-id is ambiguous because it designates both 1412 // a direct non-virtual base class and an inherited virtual base 1413 // class, the mem-initializer is ill-formed. 1414 if (DirectBaseSpec && VirtualBaseSpec) 1415 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1416 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1417 // C++ [base.class.init]p2: 1418 // Unless the mem-initializer-id names a nonstatic data membeer of the 1419 // constructor's class ot a direst or virtual base of that class, the 1420 // mem-initializer is ill-formed. 1421 if (!DirectBaseSpec && !VirtualBaseSpec) 1422 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1423 << BaseType << Context.getTypeDeclType(ClassDecl) 1424 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1425 1426 CXXBaseSpecifier *BaseSpec 1427 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1428 if (!BaseSpec) 1429 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1430 1431 // Initialize the base. 1432 InitializedEntity BaseEntity = 1433 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1434 InitializationKind Kind = 1435 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1436 1437 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1438 1439 OwningExprResult BaseInit = 1440 InitSeq.Perform(*this, BaseEntity, Kind, 1441 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1442 if (BaseInit.isInvalid()) 1443 return true; 1444 1445 // C++0x [class.base.init]p7: 1446 // The initialization of each base and member constitutes a 1447 // full-expression. 1448 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1449 if (BaseInit.isInvalid()) 1450 return true; 1451 1452 // If we are in a dependent context, template instantiation will 1453 // perform this type-checking again. Just save the arguments that we 1454 // received in a ParenListExpr. 1455 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1456 // of the information that we have about the base 1457 // initializer. However, deconstructing the ASTs is a dicey process, 1458 // and this approach is far more likely to get the corner cases right. 1459 if (CurContext->isDependentContext()) { 1460 // Bump the reference count of all of the arguments. 1461 for (unsigned I = 0; I != NumArgs; ++I) 1462 Args[I]->Retain(); 1463 1464 OwningExprResult Init 1465 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1466 RParenLoc)); 1467 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1468 BaseSpec->isVirtual(), 1469 LParenLoc, 1470 Init.takeAs<Expr>(), 1471 RParenLoc); 1472 } 1473 1474 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1475 BaseSpec->isVirtual(), 1476 LParenLoc, 1477 BaseInit.takeAs<Expr>(), 1478 RParenLoc); 1479} 1480 1481/// ImplicitInitializerKind - How an implicit base or member initializer should 1482/// initialize its base or member. 1483enum ImplicitInitializerKind { 1484 IIK_Default, 1485 IIK_Copy, 1486 IIK_Move 1487}; 1488 1489static bool 1490BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1491 ImplicitInitializerKind ImplicitInitKind, 1492 CXXBaseSpecifier *BaseSpec, 1493 bool IsInheritedVirtualBase, 1494 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1495 InitializedEntity InitEntity 1496 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1497 IsInheritedVirtualBase); 1498 1499 Sema::OwningExprResult BaseInit(SemaRef); 1500 1501 switch (ImplicitInitKind) { 1502 case IIK_Default: { 1503 InitializationKind InitKind 1504 = InitializationKind::CreateDefault(Constructor->getLocation()); 1505 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1506 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1507 Sema::MultiExprArg(SemaRef, 0, 0)); 1508 break; 1509 } 1510 1511 case IIK_Copy: { 1512 ParmVarDecl *Param = Constructor->getParamDecl(0); 1513 QualType ParamType = Param->getType().getNonReferenceType(); 1514 1515 Expr *CopyCtorArg = 1516 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1517 Constructor->getLocation(), ParamType, 0); 1518 1519 // Cast to the base class to avoid ambiguities. 1520 QualType ArgTy = 1521 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1522 ParamType.getQualifiers()); 1523 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1524 CastExpr::CK_UncheckedDerivedToBase, 1525 /*isLvalue=*/true, 1526 CXXBaseSpecifierArray(BaseSpec)); 1527 1528 InitializationKind InitKind 1529 = InitializationKind::CreateDirect(Constructor->getLocation(), 1530 SourceLocation(), SourceLocation()); 1531 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1532 &CopyCtorArg, 1); 1533 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1534 Sema::MultiExprArg(SemaRef, 1535 (void**)&CopyCtorArg, 1)); 1536 break; 1537 } 1538 1539 case IIK_Move: 1540 assert(false && "Unhandled initializer kind!"); 1541 } 1542 1543 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1544 if (BaseInit.isInvalid()) 1545 return true; 1546 1547 CXXBaseInit = 1548 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1549 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1550 SourceLocation()), 1551 BaseSpec->isVirtual(), 1552 SourceLocation(), 1553 BaseInit.takeAs<Expr>(), 1554 SourceLocation()); 1555 1556 return false; 1557} 1558 1559static bool 1560BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1561 ImplicitInitializerKind ImplicitInitKind, 1562 FieldDecl *Field, 1563 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1564 if (Field->isInvalidDecl()) 1565 return true; 1566 1567 if (ImplicitInitKind == IIK_Copy) { 1568 SourceLocation Loc = Constructor->getLocation(); 1569 ParmVarDecl *Param = Constructor->getParamDecl(0); 1570 QualType ParamType = Param->getType().getNonReferenceType(); 1571 1572 Expr *MemberExprBase = 1573 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1574 Loc, ParamType, 0); 1575 1576 // Build a reference to this field within the parameter. 1577 CXXScopeSpec SS; 1578 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1579 Sema::LookupMemberName); 1580 MemberLookup.addDecl(Field, AS_public); 1581 MemberLookup.resolveKind(); 1582 Sema::OwningExprResult CopyCtorArg 1583 = SemaRef.BuildMemberReferenceExpr(SemaRef.Owned(MemberExprBase), 1584 ParamType, Loc, 1585 /*IsArrow=*/false, 1586 SS, 1587 /*FirstQualifierInScope=*/0, 1588 MemberLookup, 1589 /*TemplateArgs=*/0); 1590 if (CopyCtorArg.isInvalid()) 1591 return true; 1592 1593 // When the field we are copying is an array, create index variables for 1594 // each dimension of the array. We use these index variables to subscript 1595 // the source array, and other clients (e.g., CodeGen) will perform the 1596 // necessary iteration with these index variables. 1597 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1598 QualType BaseType = Field->getType(); 1599 QualType SizeType = SemaRef.Context.getSizeType(); 1600 while (const ConstantArrayType *Array 1601 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1602 // Create the iteration variable for this array index. 1603 IdentifierInfo *IterationVarName = 0; 1604 { 1605 llvm::SmallString<8> Str; 1606 llvm::raw_svector_ostream OS(Str); 1607 OS << "__i" << IndexVariables.size(); 1608 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1609 } 1610 VarDecl *IterationVar 1611 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1612 IterationVarName, SizeType, 1613 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1614 VarDecl::None, VarDecl::None); 1615 IndexVariables.push_back(IterationVar); 1616 1617 // Create a reference to the iteration variable. 1618 Sema::OwningExprResult IterationVarRef 1619 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1620 assert(!IterationVarRef.isInvalid() && 1621 "Reference to invented variable cannot fail!"); 1622 1623 // Subscript the array with this iteration variable. 1624 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(move(CopyCtorArg), 1625 Loc, 1626 move(IterationVarRef), 1627 Loc); 1628 if (CopyCtorArg.isInvalid()) 1629 return true; 1630 1631 BaseType = Array->getElementType(); 1632 } 1633 1634 // Construct the entity that we will be initializing. For an array, this 1635 // will be first element in the array, which may require several levels 1636 // of array-subscript entities. 1637 llvm::SmallVector<InitializedEntity, 4> Entities; 1638 Entities.reserve(1 + IndexVariables.size()); 1639 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1640 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1641 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1642 0, 1643 Entities.back())); 1644 1645 // Direct-initialize to use the copy constructor. 1646 InitializationKind InitKind = 1647 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1648 1649 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1650 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1651 &CopyCtorArgE, 1); 1652 1653 Sema::OwningExprResult MemberInit 1654 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1655 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArgE, 1)); 1656 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1657 if (MemberInit.isInvalid()) 1658 return true; 1659 1660 CXXMemberInit 1661 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1662 MemberInit.takeAs<Expr>(), Loc, 1663 IndexVariables.data(), 1664 IndexVariables.size()); 1665 return false; 1666 } 1667 1668 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1669 1670 QualType FieldBaseElementType = 1671 SemaRef.Context.getBaseElementType(Field->getType()); 1672 1673 if (FieldBaseElementType->isRecordType()) { 1674 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1675 InitializationKind InitKind = 1676 InitializationKind::CreateDefault(Constructor->getLocation()); 1677 1678 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1679 Sema::OwningExprResult MemberInit = 1680 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1681 Sema::MultiExprArg(SemaRef, 0, 0)); 1682 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1683 if (MemberInit.isInvalid()) 1684 return true; 1685 1686 CXXMemberInit = 1687 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1688 Field, SourceLocation(), 1689 SourceLocation(), 1690 MemberInit.takeAs<Expr>(), 1691 SourceLocation()); 1692 return false; 1693 } 1694 1695 if (FieldBaseElementType->isReferenceType()) { 1696 SemaRef.Diag(Constructor->getLocation(), 1697 diag::err_uninitialized_member_in_ctor) 1698 << (int)Constructor->isImplicit() 1699 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1700 << 0 << Field->getDeclName(); 1701 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1702 return true; 1703 } 1704 1705 if (FieldBaseElementType.isConstQualified()) { 1706 SemaRef.Diag(Constructor->getLocation(), 1707 diag::err_uninitialized_member_in_ctor) 1708 << (int)Constructor->isImplicit() 1709 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1710 << 1 << Field->getDeclName(); 1711 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1712 return true; 1713 } 1714 1715 // Nothing to initialize. 1716 CXXMemberInit = 0; 1717 return false; 1718} 1719 1720namespace { 1721struct BaseAndFieldInfo { 1722 Sema &S; 1723 CXXConstructorDecl *Ctor; 1724 bool AnyErrorsInInits; 1725 ImplicitInitializerKind IIK; 1726 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1727 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1728 1729 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1730 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1731 // FIXME: Handle implicit move constructors. 1732 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1733 IIK = IIK_Copy; 1734 else 1735 IIK = IIK_Default; 1736 } 1737}; 1738} 1739 1740static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1741 FieldDecl *Top, FieldDecl *Field) { 1742 1743 // Overwhelmingly common case: we have a direct initializer for this field. 1744 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1745 Info.AllToInit.push_back(Init); 1746 1747 if (Field != Top) { 1748 Init->setMember(Top); 1749 Init->setAnonUnionMember(Field); 1750 } 1751 return false; 1752 } 1753 1754 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1755 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1756 assert(FieldClassType && "anonymous struct/union without record type"); 1757 1758 // Walk through the members, tying in any initializers for fields 1759 // we find. The earlier semantic checks should prevent redundant 1760 // initialization of union members, given the requirement that 1761 // union members never have non-trivial default constructors. 1762 1763 // TODO: in C++0x, it might be legal to have union members with 1764 // non-trivial default constructors in unions. Revise this 1765 // implementation then with the appropriate semantics. 1766 CXXRecordDecl *FieldClassDecl 1767 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1768 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1769 EA = FieldClassDecl->field_end(); FA != EA; FA++) 1770 if (CollectFieldInitializer(Info, Top, *FA)) 1771 return true; 1772 } 1773 1774 // Don't try to build an implicit initializer if there were semantic 1775 // errors in any of the initializers (and therefore we might be 1776 // missing some that the user actually wrote). 1777 if (Info.AnyErrorsInInits) 1778 return false; 1779 1780 CXXBaseOrMemberInitializer *Init = 0; 1781 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1782 return true; 1783 1784 // If the member doesn't need to be initialized, Init will still be null. 1785 if (!Init) return false; 1786 1787 Info.AllToInit.push_back(Init); 1788 if (Top != Field) { 1789 Init->setMember(Top); 1790 Init->setAnonUnionMember(Field); 1791 } 1792 return false; 1793} 1794 1795bool 1796Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1797 CXXBaseOrMemberInitializer **Initializers, 1798 unsigned NumInitializers, 1799 bool AnyErrors) { 1800 if (Constructor->getDeclContext()->isDependentContext()) { 1801 // Just store the initializers as written, they will be checked during 1802 // instantiation. 1803 if (NumInitializers > 0) { 1804 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1805 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1806 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1807 memcpy(baseOrMemberInitializers, Initializers, 1808 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1809 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1810 } 1811 1812 return false; 1813 } 1814 1815 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1816 1817 // We need to build the initializer AST according to order of construction 1818 // and not what user specified in the Initializers list. 1819 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1820 if (!ClassDecl) 1821 return true; 1822 1823 bool HadError = false; 1824 1825 for (unsigned i = 0; i < NumInitializers; i++) { 1826 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1827 1828 if (Member->isBaseInitializer()) 1829 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1830 else 1831 Info.AllBaseFields[Member->getMember()] = Member; 1832 } 1833 1834 // Keep track of the direct virtual bases. 1835 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1836 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1837 E = ClassDecl->bases_end(); I != E; ++I) { 1838 if (I->isVirtual()) 1839 DirectVBases.insert(I); 1840 } 1841 1842 // Push virtual bases before others. 1843 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1844 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1845 1846 if (CXXBaseOrMemberInitializer *Value 1847 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1848 Info.AllToInit.push_back(Value); 1849 } else if (!AnyErrors) { 1850 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1851 CXXBaseOrMemberInitializer *CXXBaseInit; 1852 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1853 VBase, IsInheritedVirtualBase, 1854 CXXBaseInit)) { 1855 HadError = true; 1856 continue; 1857 } 1858 1859 Info.AllToInit.push_back(CXXBaseInit); 1860 } 1861 } 1862 1863 // Non-virtual bases. 1864 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1865 E = ClassDecl->bases_end(); Base != E; ++Base) { 1866 // Virtuals are in the virtual base list and already constructed. 1867 if (Base->isVirtual()) 1868 continue; 1869 1870 if (CXXBaseOrMemberInitializer *Value 1871 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1872 Info.AllToInit.push_back(Value); 1873 } else if (!AnyErrors) { 1874 CXXBaseOrMemberInitializer *CXXBaseInit; 1875 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1876 Base, /*IsInheritedVirtualBase=*/false, 1877 CXXBaseInit)) { 1878 HadError = true; 1879 continue; 1880 } 1881 1882 Info.AllToInit.push_back(CXXBaseInit); 1883 } 1884 } 1885 1886 // Fields. 1887 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1888 E = ClassDecl->field_end(); Field != E; ++Field) { 1889 if ((*Field)->getType()->isIncompleteArrayType()) { 1890 assert(ClassDecl->hasFlexibleArrayMember() && 1891 "Incomplete array type is not valid"); 1892 continue; 1893 } 1894 if (CollectFieldInitializer(Info, *Field, *Field)) 1895 HadError = true; 1896 } 1897 1898 NumInitializers = Info.AllToInit.size(); 1899 if (NumInitializers > 0) { 1900 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1901 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1902 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1903 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1904 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1905 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1906 1907 // Constructors implicitly reference the base and member 1908 // destructors. 1909 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1910 Constructor->getParent()); 1911 } 1912 1913 return HadError; 1914} 1915 1916static void *GetKeyForTopLevelField(FieldDecl *Field) { 1917 // For anonymous unions, use the class declaration as the key. 1918 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1919 if (RT->getDecl()->isAnonymousStructOrUnion()) 1920 return static_cast<void *>(RT->getDecl()); 1921 } 1922 return static_cast<void *>(Field); 1923} 1924 1925static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1926 return Context.getCanonicalType(BaseType).getTypePtr(); 1927} 1928 1929static void *GetKeyForMember(ASTContext &Context, 1930 CXXBaseOrMemberInitializer *Member, 1931 bool MemberMaybeAnon = false) { 1932 if (!Member->isMemberInitializer()) 1933 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1934 1935 // For fields injected into the class via declaration of an anonymous union, 1936 // use its anonymous union class declaration as the unique key. 1937 FieldDecl *Field = Member->getMember(); 1938 1939 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1940 // data member of the class. Data member used in the initializer list is 1941 // in AnonUnionMember field. 1942 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1943 Field = Member->getAnonUnionMember(); 1944 1945 // If the field is a member of an anonymous struct or union, our key 1946 // is the anonymous record decl that's a direct child of the class. 1947 RecordDecl *RD = Field->getParent(); 1948 if (RD->isAnonymousStructOrUnion()) { 1949 while (true) { 1950 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1951 if (Parent->isAnonymousStructOrUnion()) 1952 RD = Parent; 1953 else 1954 break; 1955 } 1956 1957 return static_cast<void *>(RD); 1958 } 1959 1960 return static_cast<void *>(Field); 1961} 1962 1963static void 1964DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 1965 const CXXConstructorDecl *Constructor, 1966 CXXBaseOrMemberInitializer **Inits, 1967 unsigned NumInits) { 1968 if (Constructor->getDeclContext()->isDependentContext()) 1969 return; 1970 1971 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 1972 == Diagnostic::Ignored) 1973 return; 1974 1975 // Build the list of bases and members in the order that they'll 1976 // actually be initialized. The explicit initializers should be in 1977 // this same order but may be missing things. 1978 llvm::SmallVector<const void*, 32> IdealInitKeys; 1979 1980 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 1981 1982 // 1. Virtual bases. 1983 for (CXXRecordDecl::base_class_const_iterator VBase = 1984 ClassDecl->vbases_begin(), 1985 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1986 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 1987 1988 // 2. Non-virtual bases. 1989 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 1990 E = ClassDecl->bases_end(); Base != E; ++Base) { 1991 if (Base->isVirtual()) 1992 continue; 1993 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 1994 } 1995 1996 // 3. Direct fields. 1997 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1998 E = ClassDecl->field_end(); Field != E; ++Field) 1999 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2000 2001 unsigned NumIdealInits = IdealInitKeys.size(); 2002 unsigned IdealIndex = 0; 2003 2004 CXXBaseOrMemberInitializer *PrevInit = 0; 2005 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2006 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2007 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2008 2009 // Scan forward to try to find this initializer in the idealized 2010 // initializers list. 2011 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2012 if (InitKey == IdealInitKeys[IdealIndex]) 2013 break; 2014 2015 // If we didn't find this initializer, it must be because we 2016 // scanned past it on a previous iteration. That can only 2017 // happen if we're out of order; emit a warning. 2018 if (IdealIndex == NumIdealInits && PrevInit) { 2019 Sema::SemaDiagnosticBuilder D = 2020 SemaRef.Diag(PrevInit->getSourceLocation(), 2021 diag::warn_initializer_out_of_order); 2022 2023 if (PrevInit->isMemberInitializer()) 2024 D << 0 << PrevInit->getMember()->getDeclName(); 2025 else 2026 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2027 2028 if (Init->isMemberInitializer()) 2029 D << 0 << Init->getMember()->getDeclName(); 2030 else 2031 D << 1 << Init->getBaseClassInfo()->getType(); 2032 2033 // Move back to the initializer's location in the ideal list. 2034 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2035 if (InitKey == IdealInitKeys[IdealIndex]) 2036 break; 2037 2038 assert(IdealIndex != NumIdealInits && 2039 "initializer not found in initializer list"); 2040 } 2041 2042 PrevInit = Init; 2043 } 2044} 2045 2046namespace { 2047bool CheckRedundantInit(Sema &S, 2048 CXXBaseOrMemberInitializer *Init, 2049 CXXBaseOrMemberInitializer *&PrevInit) { 2050 if (!PrevInit) { 2051 PrevInit = Init; 2052 return false; 2053 } 2054 2055 if (FieldDecl *Field = Init->getMember()) 2056 S.Diag(Init->getSourceLocation(), 2057 diag::err_multiple_mem_initialization) 2058 << Field->getDeclName() 2059 << Init->getSourceRange(); 2060 else { 2061 Type *BaseClass = Init->getBaseClass(); 2062 assert(BaseClass && "neither field nor base"); 2063 S.Diag(Init->getSourceLocation(), 2064 diag::err_multiple_base_initialization) 2065 << QualType(BaseClass, 0) 2066 << Init->getSourceRange(); 2067 } 2068 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2069 << 0 << PrevInit->getSourceRange(); 2070 2071 return true; 2072} 2073 2074typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2075typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2076 2077bool CheckRedundantUnionInit(Sema &S, 2078 CXXBaseOrMemberInitializer *Init, 2079 RedundantUnionMap &Unions) { 2080 FieldDecl *Field = Init->getMember(); 2081 RecordDecl *Parent = Field->getParent(); 2082 if (!Parent->isAnonymousStructOrUnion()) 2083 return false; 2084 2085 NamedDecl *Child = Field; 2086 do { 2087 if (Parent->isUnion()) { 2088 UnionEntry &En = Unions[Parent]; 2089 if (En.first && En.first != Child) { 2090 S.Diag(Init->getSourceLocation(), 2091 diag::err_multiple_mem_union_initialization) 2092 << Field->getDeclName() 2093 << Init->getSourceRange(); 2094 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2095 << 0 << En.second->getSourceRange(); 2096 return true; 2097 } else if (!En.first) { 2098 En.first = Child; 2099 En.second = Init; 2100 } 2101 } 2102 2103 Child = Parent; 2104 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2105 } while (Parent->isAnonymousStructOrUnion()); 2106 2107 return false; 2108} 2109} 2110 2111/// ActOnMemInitializers - Handle the member initializers for a constructor. 2112void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 2113 SourceLocation ColonLoc, 2114 MemInitTy **meminits, unsigned NumMemInits, 2115 bool AnyErrors) { 2116 if (!ConstructorDecl) 2117 return; 2118 2119 AdjustDeclIfTemplate(ConstructorDecl); 2120 2121 CXXConstructorDecl *Constructor 2122 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 2123 2124 if (!Constructor) { 2125 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2126 return; 2127 } 2128 2129 CXXBaseOrMemberInitializer **MemInits = 2130 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2131 2132 // Mapping for the duplicate initializers check. 2133 // For member initializers, this is keyed with a FieldDecl*. 2134 // For base initializers, this is keyed with a Type*. 2135 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2136 2137 // Mapping for the inconsistent anonymous-union initializers check. 2138 RedundantUnionMap MemberUnions; 2139 2140 bool HadError = false; 2141 for (unsigned i = 0; i < NumMemInits; i++) { 2142 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2143 2144 // Set the source order index. 2145 Init->setSourceOrder(i); 2146 2147 if (Init->isMemberInitializer()) { 2148 FieldDecl *Field = Init->getMember(); 2149 if (CheckRedundantInit(*this, Init, Members[Field]) || 2150 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2151 HadError = true; 2152 } else { 2153 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2154 if (CheckRedundantInit(*this, Init, Members[Key])) 2155 HadError = true; 2156 } 2157 } 2158 2159 if (HadError) 2160 return; 2161 2162 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2163 2164 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2165} 2166 2167void 2168Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2169 CXXRecordDecl *ClassDecl) { 2170 // Ignore dependent contexts. 2171 if (ClassDecl->isDependentContext()) 2172 return; 2173 2174 // FIXME: all the access-control diagnostics are positioned on the 2175 // field/base declaration. That's probably good; that said, the 2176 // user might reasonably want to know why the destructor is being 2177 // emitted, and we currently don't say. 2178 2179 // Non-static data members. 2180 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2181 E = ClassDecl->field_end(); I != E; ++I) { 2182 FieldDecl *Field = *I; 2183 if (Field->isInvalidDecl()) 2184 continue; 2185 QualType FieldType = Context.getBaseElementType(Field->getType()); 2186 2187 const RecordType* RT = FieldType->getAs<RecordType>(); 2188 if (!RT) 2189 continue; 2190 2191 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2192 if (FieldClassDecl->hasTrivialDestructor()) 2193 continue; 2194 2195 CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 2196 CheckDestructorAccess(Field->getLocation(), Dtor, 2197 PDiag(diag::err_access_dtor_field) 2198 << Field->getDeclName() 2199 << FieldType); 2200 2201 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2202 } 2203 2204 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2205 2206 // Bases. 2207 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2208 E = ClassDecl->bases_end(); Base != E; ++Base) { 2209 // Bases are always records in a well-formed non-dependent class. 2210 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2211 2212 // Remember direct virtual bases. 2213 if (Base->isVirtual()) 2214 DirectVirtualBases.insert(RT); 2215 2216 // Ignore trivial destructors. 2217 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2218 if (BaseClassDecl->hasTrivialDestructor()) 2219 continue; 2220 2221 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2222 2223 // FIXME: caret should be on the start of the class name 2224 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2225 PDiag(diag::err_access_dtor_base) 2226 << Base->getType() 2227 << Base->getSourceRange()); 2228 2229 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2230 } 2231 2232 // Virtual bases. 2233 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2234 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2235 2236 // Bases are always records in a well-formed non-dependent class. 2237 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2238 2239 // Ignore direct virtual bases. 2240 if (DirectVirtualBases.count(RT)) 2241 continue; 2242 2243 // Ignore trivial destructors. 2244 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2245 if (BaseClassDecl->hasTrivialDestructor()) 2246 continue; 2247 2248 CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 2249 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2250 PDiag(diag::err_access_dtor_vbase) 2251 << VBase->getType()); 2252 2253 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2254 } 2255} 2256 2257void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2258 if (!CDtorDecl) 2259 return; 2260 2261 if (CXXConstructorDecl *Constructor 2262 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2263 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2264} 2265 2266bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2267 unsigned DiagID, AbstractDiagSelID SelID, 2268 const CXXRecordDecl *CurrentRD) { 2269 if (SelID == -1) 2270 return RequireNonAbstractType(Loc, T, 2271 PDiag(DiagID), CurrentRD); 2272 else 2273 return RequireNonAbstractType(Loc, T, 2274 PDiag(DiagID) << SelID, CurrentRD); 2275} 2276 2277bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2278 const PartialDiagnostic &PD, 2279 const CXXRecordDecl *CurrentRD) { 2280 if (!getLangOptions().CPlusPlus) 2281 return false; 2282 2283 if (const ArrayType *AT = Context.getAsArrayType(T)) 2284 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2285 CurrentRD); 2286 2287 if (const PointerType *PT = T->getAs<PointerType>()) { 2288 // Find the innermost pointer type. 2289 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2290 PT = T; 2291 2292 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2293 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2294 } 2295 2296 const RecordType *RT = T->getAs<RecordType>(); 2297 if (!RT) 2298 return false; 2299 2300 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2301 2302 if (CurrentRD && CurrentRD != RD) 2303 return false; 2304 2305 // FIXME: is this reasonable? It matches current behavior, but.... 2306 if (!RD->getDefinition()) 2307 return false; 2308 2309 if (!RD->isAbstract()) 2310 return false; 2311 2312 Diag(Loc, PD) << RD->getDeclName(); 2313 2314 // Check if we've already emitted the list of pure virtual functions for this 2315 // class. 2316 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2317 return true; 2318 2319 CXXFinalOverriderMap FinalOverriders; 2320 RD->getFinalOverriders(FinalOverriders); 2321 2322 // Keep a set of seen pure methods so we won't diagnose the same method 2323 // more than once. 2324 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2325 2326 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2327 MEnd = FinalOverriders.end(); 2328 M != MEnd; 2329 ++M) { 2330 for (OverridingMethods::iterator SO = M->second.begin(), 2331 SOEnd = M->second.end(); 2332 SO != SOEnd; ++SO) { 2333 // C++ [class.abstract]p4: 2334 // A class is abstract if it contains or inherits at least one 2335 // pure virtual function for which the final overrider is pure 2336 // virtual. 2337 2338 // 2339 if (SO->second.size() != 1) 2340 continue; 2341 2342 if (!SO->second.front().Method->isPure()) 2343 continue; 2344 2345 if (!SeenPureMethods.insert(SO->second.front().Method)) 2346 continue; 2347 2348 Diag(SO->second.front().Method->getLocation(), 2349 diag::note_pure_virtual_function) 2350 << SO->second.front().Method->getDeclName(); 2351 } 2352 } 2353 2354 if (!PureVirtualClassDiagSet) 2355 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2356 PureVirtualClassDiagSet->insert(RD); 2357 2358 return true; 2359} 2360 2361namespace { 2362 class AbstractClassUsageDiagnoser 2363 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2364 Sema &SemaRef; 2365 CXXRecordDecl *AbstractClass; 2366 2367 bool VisitDeclContext(const DeclContext *DC) { 2368 bool Invalid = false; 2369 2370 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2371 E = DC->decls_end(); I != E; ++I) 2372 Invalid |= Visit(*I); 2373 2374 return Invalid; 2375 } 2376 2377 public: 2378 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2379 : SemaRef(SemaRef), AbstractClass(ac) { 2380 Visit(SemaRef.Context.getTranslationUnitDecl()); 2381 } 2382 2383 bool VisitFunctionDecl(const FunctionDecl *FD) { 2384 if (FD->isThisDeclarationADefinition()) { 2385 // No need to do the check if we're in a definition, because it requires 2386 // that the return/param types are complete. 2387 // because that requires 2388 return VisitDeclContext(FD); 2389 } 2390 2391 // Check the return type. 2392 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2393 bool Invalid = 2394 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2395 diag::err_abstract_type_in_decl, 2396 Sema::AbstractReturnType, 2397 AbstractClass); 2398 2399 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2400 E = FD->param_end(); I != E; ++I) { 2401 const ParmVarDecl *VD = *I; 2402 Invalid |= 2403 SemaRef.RequireNonAbstractType(VD->getLocation(), 2404 VD->getOriginalType(), 2405 diag::err_abstract_type_in_decl, 2406 Sema::AbstractParamType, 2407 AbstractClass); 2408 } 2409 2410 return Invalid; 2411 } 2412 2413 bool VisitDecl(const Decl* D) { 2414 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2415 return VisitDeclContext(DC); 2416 2417 return false; 2418 } 2419 }; 2420} 2421 2422/// \brief Perform semantic checks on a class definition that has been 2423/// completing, introducing implicitly-declared members, checking for 2424/// abstract types, etc. 2425void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { 2426 if (!Record || Record->isInvalidDecl()) 2427 return; 2428 2429 if (!Record->isDependentType()) 2430 AddImplicitlyDeclaredMembersToClass(S, Record); 2431 2432 if (Record->isInvalidDecl()) 2433 return; 2434 2435 // Set access bits correctly on the directly-declared conversions. 2436 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2437 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2438 Convs->setAccess(I, (*I)->getAccess()); 2439 2440 // Determine whether we need to check for final overriders. We do 2441 // this either when there are virtual base classes (in which case we 2442 // may end up finding multiple final overriders for a given virtual 2443 // function) or any of the base classes is abstract (in which case 2444 // we might detect that this class is abstract). 2445 bool CheckFinalOverriders = false; 2446 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2447 !Record->isDependentType()) { 2448 if (Record->getNumVBases()) 2449 CheckFinalOverriders = true; 2450 else if (!Record->isAbstract()) { 2451 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2452 BEnd = Record->bases_end(); 2453 B != BEnd; ++B) { 2454 CXXRecordDecl *BaseDecl 2455 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2456 if (BaseDecl->isAbstract()) { 2457 CheckFinalOverriders = true; 2458 break; 2459 } 2460 } 2461 } 2462 } 2463 2464 if (CheckFinalOverriders) { 2465 CXXFinalOverriderMap FinalOverriders; 2466 Record->getFinalOverriders(FinalOverriders); 2467 2468 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2469 MEnd = FinalOverriders.end(); 2470 M != MEnd; ++M) { 2471 for (OverridingMethods::iterator SO = M->second.begin(), 2472 SOEnd = M->second.end(); 2473 SO != SOEnd; ++SO) { 2474 assert(SO->second.size() > 0 && 2475 "All virtual functions have overridding virtual functions"); 2476 if (SO->second.size() == 1) { 2477 // C++ [class.abstract]p4: 2478 // A class is abstract if it contains or inherits at least one 2479 // pure virtual function for which the final overrider is pure 2480 // virtual. 2481 if (SO->second.front().Method->isPure()) 2482 Record->setAbstract(true); 2483 continue; 2484 } 2485 2486 // C++ [class.virtual]p2: 2487 // In a derived class, if a virtual member function of a base 2488 // class subobject has more than one final overrider the 2489 // program is ill-formed. 2490 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2491 << (NamedDecl *)M->first << Record; 2492 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2493 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2494 OMEnd = SO->second.end(); 2495 OM != OMEnd; ++OM) 2496 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2497 << (NamedDecl *)M->first << OM->Method->getParent(); 2498 2499 Record->setInvalidDecl(); 2500 } 2501 } 2502 } 2503 2504 if (Record->isAbstract() && !Record->isInvalidDecl()) 2505 (void)AbstractClassUsageDiagnoser(*this, Record); 2506 2507 // If this is not an aggregate type and has no user-declared constructor, 2508 // complain about any non-static data members of reference or const scalar 2509 // type, since they will never get initializers. 2510 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2511 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2512 bool Complained = false; 2513 for (RecordDecl::field_iterator F = Record->field_begin(), 2514 FEnd = Record->field_end(); 2515 F != FEnd; ++F) { 2516 if (F->getType()->isReferenceType() || 2517 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2518 if (!Complained) { 2519 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2520 << Record->getTagKind() << Record; 2521 Complained = true; 2522 } 2523 2524 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2525 << F->getType()->isReferenceType() 2526 << F->getDeclName(); 2527 } 2528 } 2529 } 2530 2531 if (Record->isDynamicClass()) 2532 DynamicClasses.push_back(Record); 2533} 2534 2535void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2536 DeclPtrTy TagDecl, 2537 SourceLocation LBrac, 2538 SourceLocation RBrac, 2539 AttributeList *AttrList) { 2540 if (!TagDecl) 2541 return; 2542 2543 AdjustDeclIfTemplate(TagDecl); 2544 2545 ActOnFields(S, RLoc, TagDecl, 2546 (DeclPtrTy*)FieldCollector->getCurFields(), 2547 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2548 2549 CheckCompletedCXXClass(S, 2550 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2551} 2552 2553/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2554/// special functions, such as the default constructor, copy 2555/// constructor, or destructor, to the given C++ class (C++ 2556/// [special]p1). This routine can only be executed just before the 2557/// definition of the class is complete. 2558/// 2559/// The scope, if provided, is the class scope. 2560void Sema::AddImplicitlyDeclaredMembersToClass(Scope *S, 2561 CXXRecordDecl *ClassDecl) { 2562 CanQualType ClassType 2563 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2564 2565 // FIXME: Implicit declarations have exception specifications, which are 2566 // the union of the specifications of the implicitly called functions. 2567 2568 if (!ClassDecl->hasUserDeclaredConstructor()) { 2569 // C++ [class.ctor]p5: 2570 // A default constructor for a class X is a constructor of class X 2571 // that can be called without an argument. If there is no 2572 // user-declared constructor for class X, a default constructor is 2573 // implicitly declared. An implicitly-declared default constructor 2574 // is an inline public member of its class. 2575 DeclarationName Name 2576 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2577 CXXConstructorDecl *DefaultCon = 2578 CXXConstructorDecl::Create(Context, ClassDecl, 2579 ClassDecl->getLocation(), Name, 2580 Context.getFunctionType(Context.VoidTy, 2581 0, 0, false, 0, 2582 /*FIXME*/false, false, 2583 0, 0, 2584 FunctionType::ExtInfo()), 2585 /*TInfo=*/0, 2586 /*isExplicit=*/false, 2587 /*isInline=*/true, 2588 /*isImplicitlyDeclared=*/true); 2589 DefaultCon->setAccess(AS_public); 2590 DefaultCon->setImplicit(); 2591 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 2592 if (S) 2593 PushOnScopeChains(DefaultCon, S, true); 2594 else 2595 ClassDecl->addDecl(DefaultCon); 2596 } 2597 2598 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 2599 // C++ [class.copy]p4: 2600 // If the class definition does not explicitly declare a copy 2601 // constructor, one is declared implicitly. 2602 2603 // C++ [class.copy]p5: 2604 // The implicitly-declared copy constructor for a class X will 2605 // have the form 2606 // 2607 // X::X(const X&) 2608 // 2609 // if 2610 bool HasConstCopyConstructor = true; 2611 2612 // -- each direct or virtual base class B of X has a copy 2613 // constructor whose first parameter is of type const B& or 2614 // const volatile B&, and 2615 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2616 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2617 const CXXRecordDecl *BaseClassDecl 2618 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2619 HasConstCopyConstructor 2620 = BaseClassDecl->hasConstCopyConstructor(Context); 2621 } 2622 2623 // -- for all the nonstatic data members of X that are of a 2624 // class type M (or array thereof), each such class type 2625 // has a copy constructor whose first parameter is of type 2626 // const M& or const volatile M&. 2627 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2628 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2629 ++Field) { 2630 QualType FieldType = (*Field)->getType(); 2631 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2632 FieldType = Array->getElementType(); 2633 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2634 const CXXRecordDecl *FieldClassDecl 2635 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2636 HasConstCopyConstructor 2637 = FieldClassDecl->hasConstCopyConstructor(Context); 2638 } 2639 } 2640 2641 // Otherwise, the implicitly declared copy constructor will have 2642 // the form 2643 // 2644 // X::X(X&) 2645 QualType ArgType = ClassType; 2646 if (HasConstCopyConstructor) 2647 ArgType = ArgType.withConst(); 2648 ArgType = Context.getLValueReferenceType(ArgType); 2649 2650 // An implicitly-declared copy constructor is an inline public 2651 // member of its class. 2652 DeclarationName Name 2653 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2654 CXXConstructorDecl *CopyConstructor 2655 = CXXConstructorDecl::Create(Context, ClassDecl, 2656 ClassDecl->getLocation(), Name, 2657 Context.getFunctionType(Context.VoidTy, 2658 &ArgType, 1, 2659 false, 0, 2660 /*FIXME: hasExceptionSpec*/false, 2661 false, 0, 0, 2662 FunctionType::ExtInfo()), 2663 /*TInfo=*/0, 2664 /*isExplicit=*/false, 2665 /*isInline=*/true, 2666 /*isImplicitlyDeclared=*/true); 2667 CopyConstructor->setAccess(AS_public); 2668 CopyConstructor->setImplicit(); 2669 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2670 2671 // Add the parameter to the constructor. 2672 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2673 ClassDecl->getLocation(), 2674 /*IdentifierInfo=*/0, 2675 ArgType, /*TInfo=*/0, 2676 VarDecl::None, 2677 VarDecl::None, 0); 2678 CopyConstructor->setParams(&FromParam, 1); 2679 if (S) 2680 PushOnScopeChains(CopyConstructor, S, true); 2681 else 2682 ClassDecl->addDecl(CopyConstructor); 2683 } 2684 2685 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2686 // Note: The following rules are largely analoguous to the copy 2687 // constructor rules. Note that virtual bases are not taken into account 2688 // for determining the argument type of the operator. Note also that 2689 // operators taking an object instead of a reference are allowed. 2690 // 2691 // C++ [class.copy]p10: 2692 // If the class definition does not explicitly declare a copy 2693 // assignment operator, one is declared implicitly. 2694 // The implicitly-defined copy assignment operator for a class X 2695 // will have the form 2696 // 2697 // X& X::operator=(const X&) 2698 // 2699 // if 2700 bool HasConstCopyAssignment = true; 2701 2702 // -- each direct base class B of X has a copy assignment operator 2703 // whose parameter is of type const B&, const volatile B& or B, 2704 // and 2705 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2706 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2707 assert(!Base->getType()->isDependentType() && 2708 "Cannot generate implicit members for class with dependent bases."); 2709 const CXXRecordDecl *BaseClassDecl 2710 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2711 const CXXMethodDecl *MD = 0; 2712 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2713 MD); 2714 } 2715 2716 // -- for all the nonstatic data members of X that are of a class 2717 // type M (or array thereof), each such class type has a copy 2718 // assignment operator whose parameter is of type const M&, 2719 // const volatile M& or M. 2720 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2721 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2722 ++Field) { 2723 QualType FieldType = (*Field)->getType(); 2724 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2725 FieldType = Array->getElementType(); 2726 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2727 const CXXRecordDecl *FieldClassDecl 2728 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2729 const CXXMethodDecl *MD = 0; 2730 HasConstCopyAssignment 2731 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2732 } 2733 } 2734 2735 // Otherwise, the implicitly declared copy assignment operator will 2736 // have the form 2737 // 2738 // X& X::operator=(X&) 2739 QualType ArgType = ClassType; 2740 QualType RetType = Context.getLValueReferenceType(ArgType); 2741 if (HasConstCopyAssignment) 2742 ArgType = ArgType.withConst(); 2743 ArgType = Context.getLValueReferenceType(ArgType); 2744 2745 // An implicitly-declared copy assignment operator is an inline public 2746 // member of its class. 2747 DeclarationName Name = 2748 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2749 CXXMethodDecl *CopyAssignment = 2750 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2751 Context.getFunctionType(RetType, &ArgType, 1, 2752 false, 0, 2753 /*FIXME: hasExceptionSpec*/false, 2754 false, 0, 0, 2755 FunctionType::ExtInfo()), 2756 /*TInfo=*/0, /*isStatic=*/false, 2757 /*StorageClassAsWritten=*/FunctionDecl::None, 2758 /*isInline=*/true); 2759 CopyAssignment->setAccess(AS_public); 2760 CopyAssignment->setImplicit(); 2761 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2762 CopyAssignment->setCopyAssignment(true); 2763 2764 // Add the parameter to the operator. 2765 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2766 ClassDecl->getLocation(), 2767 /*Id=*/0, 2768 ArgType, /*TInfo=*/0, 2769 VarDecl::None, 2770 VarDecl::None, 0); 2771 CopyAssignment->setParams(&FromParam, 1); 2772 2773 // Don't call addedAssignmentOperator. There is no way to distinguish an 2774 // implicit from an explicit assignment operator. 2775 if (S) 2776 PushOnScopeChains(CopyAssignment, S, true); 2777 else 2778 ClassDecl->addDecl(CopyAssignment); 2779 AddOverriddenMethods(ClassDecl, CopyAssignment); 2780 } 2781 2782 if (!ClassDecl->hasUserDeclaredDestructor()) { 2783 // C++ [class.dtor]p2: 2784 // If a class has no user-declared destructor, a destructor is 2785 // declared implicitly. An implicitly-declared destructor is an 2786 // inline public member of its class. 2787 QualType Ty = Context.getFunctionType(Context.VoidTy, 2788 0, 0, false, 0, 2789 /*FIXME: hasExceptionSpec*/false, 2790 false, 0, 0, FunctionType::ExtInfo()); 2791 2792 DeclarationName Name 2793 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2794 CXXDestructorDecl *Destructor 2795 = CXXDestructorDecl::Create(Context, ClassDecl, 2796 ClassDecl->getLocation(), Name, Ty, 2797 /*isInline=*/true, 2798 /*isImplicitlyDeclared=*/true); 2799 Destructor->setAccess(AS_public); 2800 Destructor->setImplicit(); 2801 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2802 if (S) 2803 PushOnScopeChains(Destructor, S, true); 2804 else 2805 ClassDecl->addDecl(Destructor); 2806 2807 // This could be uniqued if it ever proves significant. 2808 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 2809 2810 AddOverriddenMethods(ClassDecl, Destructor); 2811 } 2812} 2813 2814void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2815 Decl *D = TemplateD.getAs<Decl>(); 2816 if (!D) 2817 return; 2818 2819 TemplateParameterList *Params = 0; 2820 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2821 Params = Template->getTemplateParameters(); 2822 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2823 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2824 Params = PartialSpec->getTemplateParameters(); 2825 else 2826 return; 2827 2828 for (TemplateParameterList::iterator Param = Params->begin(), 2829 ParamEnd = Params->end(); 2830 Param != ParamEnd; ++Param) { 2831 NamedDecl *Named = cast<NamedDecl>(*Param); 2832 if (Named->getDeclName()) { 2833 S->AddDecl(DeclPtrTy::make(Named)); 2834 IdResolver.AddDecl(Named); 2835 } 2836 } 2837} 2838 2839void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2840 if (!RecordD) return; 2841 AdjustDeclIfTemplate(RecordD); 2842 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2843 PushDeclContext(S, Record); 2844} 2845 2846void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2847 if (!RecordD) return; 2848 PopDeclContext(); 2849} 2850 2851/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2852/// parsing a top-level (non-nested) C++ class, and we are now 2853/// parsing those parts of the given Method declaration that could 2854/// not be parsed earlier (C++ [class.mem]p2), such as default 2855/// arguments. This action should enter the scope of the given 2856/// Method declaration as if we had just parsed the qualified method 2857/// name. However, it should not bring the parameters into scope; 2858/// that will be performed by ActOnDelayedCXXMethodParameter. 2859void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2860} 2861 2862/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2863/// C++ method declaration. We're (re-)introducing the given 2864/// function parameter into scope for use in parsing later parts of 2865/// the method declaration. For example, we could see an 2866/// ActOnParamDefaultArgument event for this parameter. 2867void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2868 if (!ParamD) 2869 return; 2870 2871 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2872 2873 // If this parameter has an unparsed default argument, clear it out 2874 // to make way for the parsed default argument. 2875 if (Param->hasUnparsedDefaultArg()) 2876 Param->setDefaultArg(0); 2877 2878 S->AddDecl(DeclPtrTy::make(Param)); 2879 if (Param->getDeclName()) 2880 IdResolver.AddDecl(Param); 2881} 2882 2883/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2884/// processing the delayed method declaration for Method. The method 2885/// declaration is now considered finished. There may be a separate 2886/// ActOnStartOfFunctionDef action later (not necessarily 2887/// immediately!) for this method, if it was also defined inside the 2888/// class body. 2889void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2890 if (!MethodD) 2891 return; 2892 2893 AdjustDeclIfTemplate(MethodD); 2894 2895 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2896 2897 // Now that we have our default arguments, check the constructor 2898 // again. It could produce additional diagnostics or affect whether 2899 // the class has implicitly-declared destructors, among other 2900 // things. 2901 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2902 CheckConstructor(Constructor); 2903 2904 // Check the default arguments, which we may have added. 2905 if (!Method->isInvalidDecl()) 2906 CheckCXXDefaultArguments(Method); 2907} 2908 2909/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2910/// the well-formedness of the constructor declarator @p D with type @p 2911/// R. If there are any errors in the declarator, this routine will 2912/// emit diagnostics and set the invalid bit to true. In any case, the type 2913/// will be updated to reflect a well-formed type for the constructor and 2914/// returned. 2915QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2916 FunctionDecl::StorageClass &SC) { 2917 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2918 2919 // C++ [class.ctor]p3: 2920 // A constructor shall not be virtual (10.3) or static (9.4). A 2921 // constructor can be invoked for a const, volatile or const 2922 // volatile object. A constructor shall not be declared const, 2923 // volatile, or const volatile (9.3.2). 2924 if (isVirtual) { 2925 if (!D.isInvalidType()) 2926 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2927 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2928 << SourceRange(D.getIdentifierLoc()); 2929 D.setInvalidType(); 2930 } 2931 if (SC == FunctionDecl::Static) { 2932 if (!D.isInvalidType()) 2933 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2934 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2935 << SourceRange(D.getIdentifierLoc()); 2936 D.setInvalidType(); 2937 SC = FunctionDecl::None; 2938 } 2939 2940 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2941 if (FTI.TypeQuals != 0) { 2942 if (FTI.TypeQuals & Qualifiers::Const) 2943 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2944 << "const" << SourceRange(D.getIdentifierLoc()); 2945 if (FTI.TypeQuals & Qualifiers::Volatile) 2946 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2947 << "volatile" << SourceRange(D.getIdentifierLoc()); 2948 if (FTI.TypeQuals & Qualifiers::Restrict) 2949 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2950 << "restrict" << SourceRange(D.getIdentifierLoc()); 2951 } 2952 2953 // Rebuild the function type "R" without any type qualifiers (in 2954 // case any of the errors above fired) and with "void" as the 2955 // return type, since constructors don't have return types. We 2956 // *always* have to do this, because GetTypeForDeclarator will 2957 // put in a result type of "int" when none was specified. 2958 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2959 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2960 Proto->getNumArgs(), 2961 Proto->isVariadic(), 0, 2962 Proto->hasExceptionSpec(), 2963 Proto->hasAnyExceptionSpec(), 2964 Proto->getNumExceptions(), 2965 Proto->exception_begin(), 2966 Proto->getExtInfo()); 2967} 2968 2969/// CheckConstructor - Checks a fully-formed constructor for 2970/// well-formedness, issuing any diagnostics required. Returns true if 2971/// the constructor declarator is invalid. 2972void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2973 CXXRecordDecl *ClassDecl 2974 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2975 if (!ClassDecl) 2976 return Constructor->setInvalidDecl(); 2977 2978 // C++ [class.copy]p3: 2979 // A declaration of a constructor for a class X is ill-formed if 2980 // its first parameter is of type (optionally cv-qualified) X and 2981 // either there are no other parameters or else all other 2982 // parameters have default arguments. 2983 if (!Constructor->isInvalidDecl() && 2984 ((Constructor->getNumParams() == 1) || 2985 (Constructor->getNumParams() > 1 && 2986 Constructor->getParamDecl(1)->hasDefaultArg())) && 2987 Constructor->getTemplateSpecializationKind() 2988 != TSK_ImplicitInstantiation) { 2989 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2990 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2991 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2992 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2993 const char *ConstRef 2994 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2995 : " const &"; 2996 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2997 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 2998 2999 // FIXME: Rather that making the constructor invalid, we should endeavor 3000 // to fix the type. 3001 Constructor->setInvalidDecl(); 3002 } 3003 } 3004 3005 // Notify the class that we've added a constructor. In principle we 3006 // don't need to do this for out-of-line declarations; in practice 3007 // we only instantiate the most recent declaration of a method, so 3008 // we have to call this for everything but friends. 3009 if (!Constructor->getFriendObjectKind()) 3010 ClassDecl->addedConstructor(Context, Constructor); 3011} 3012 3013/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 3014/// issuing any diagnostics required. Returns true on error. 3015bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 3016 CXXRecordDecl *RD = Destructor->getParent(); 3017 3018 if (Destructor->isVirtual()) { 3019 SourceLocation Loc; 3020 3021 if (!Destructor->isImplicit()) 3022 Loc = Destructor->getLocation(); 3023 else 3024 Loc = RD->getLocation(); 3025 3026 // If we have a virtual destructor, look up the deallocation function 3027 FunctionDecl *OperatorDelete = 0; 3028 DeclarationName Name = 3029 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3030 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3031 return true; 3032 3033 Destructor->setOperatorDelete(OperatorDelete); 3034 } 3035 3036 return false; 3037} 3038 3039static inline bool 3040FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3041 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3042 FTI.ArgInfo[0].Param && 3043 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 3044} 3045 3046/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3047/// the well-formednes of the destructor declarator @p D with type @p 3048/// R. If there are any errors in the declarator, this routine will 3049/// emit diagnostics and set the declarator to invalid. Even if this happens, 3050/// will be updated to reflect a well-formed type for the destructor and 3051/// returned. 3052QualType Sema::CheckDestructorDeclarator(Declarator &D, 3053 FunctionDecl::StorageClass& SC) { 3054 // C++ [class.dtor]p1: 3055 // [...] A typedef-name that names a class is a class-name 3056 // (7.1.3); however, a typedef-name that names a class shall not 3057 // be used as the identifier in the declarator for a destructor 3058 // declaration. 3059 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3060 if (isa<TypedefType>(DeclaratorType)) { 3061 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3062 << DeclaratorType; 3063 D.setInvalidType(); 3064 } 3065 3066 // C++ [class.dtor]p2: 3067 // A destructor is used to destroy objects of its class type. A 3068 // destructor takes no parameters, and no return type can be 3069 // specified for it (not even void). The address of a destructor 3070 // shall not be taken. A destructor shall not be static. A 3071 // destructor can be invoked for a const, volatile or const 3072 // volatile object. A destructor shall not be declared const, 3073 // volatile or const volatile (9.3.2). 3074 if (SC == FunctionDecl::Static) { 3075 if (!D.isInvalidType()) 3076 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3077 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3078 << SourceRange(D.getIdentifierLoc()); 3079 SC = FunctionDecl::None; 3080 D.setInvalidType(); 3081 } 3082 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3083 // Destructors don't have return types, but the parser will 3084 // happily parse something like: 3085 // 3086 // class X { 3087 // float ~X(); 3088 // }; 3089 // 3090 // The return type will be eliminated later. 3091 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3092 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3093 << SourceRange(D.getIdentifierLoc()); 3094 } 3095 3096 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3097 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3098 if (FTI.TypeQuals & Qualifiers::Const) 3099 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3100 << "const" << SourceRange(D.getIdentifierLoc()); 3101 if (FTI.TypeQuals & Qualifiers::Volatile) 3102 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3103 << "volatile" << SourceRange(D.getIdentifierLoc()); 3104 if (FTI.TypeQuals & Qualifiers::Restrict) 3105 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3106 << "restrict" << SourceRange(D.getIdentifierLoc()); 3107 D.setInvalidType(); 3108 } 3109 3110 // Make sure we don't have any parameters. 3111 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3112 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3113 3114 // Delete the parameters. 3115 FTI.freeArgs(); 3116 D.setInvalidType(); 3117 } 3118 3119 // Make sure the destructor isn't variadic. 3120 if (FTI.isVariadic) { 3121 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3122 D.setInvalidType(); 3123 } 3124 3125 // Rebuild the function type "R" without any type qualifiers or 3126 // parameters (in case any of the errors above fired) and with 3127 // "void" as the return type, since destructors don't have return 3128 // types. We *always* have to do this, because GetTypeForDeclarator 3129 // will put in a result type of "int" when none was specified. 3130 // FIXME: Exceptions! 3131 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3132 false, false, 0, 0, FunctionType::ExtInfo()); 3133} 3134 3135/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3136/// well-formednes of the conversion function declarator @p D with 3137/// type @p R. If there are any errors in the declarator, this routine 3138/// will emit diagnostics and return true. Otherwise, it will return 3139/// false. Either way, the type @p R will be updated to reflect a 3140/// well-formed type for the conversion operator. 3141void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3142 FunctionDecl::StorageClass& SC) { 3143 // C++ [class.conv.fct]p1: 3144 // Neither parameter types nor return type can be specified. The 3145 // type of a conversion function (8.3.5) is "function taking no 3146 // parameter returning conversion-type-id." 3147 if (SC == FunctionDecl::Static) { 3148 if (!D.isInvalidType()) 3149 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3150 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3151 << SourceRange(D.getIdentifierLoc()); 3152 D.setInvalidType(); 3153 SC = FunctionDecl::None; 3154 } 3155 3156 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3157 3158 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3159 // Conversion functions don't have return types, but the parser will 3160 // happily parse something like: 3161 // 3162 // class X { 3163 // float operator bool(); 3164 // }; 3165 // 3166 // The return type will be changed later anyway. 3167 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3168 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3169 << SourceRange(D.getIdentifierLoc()); 3170 D.setInvalidType(); 3171 } 3172 3173 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3174 3175 // Make sure we don't have any parameters. 3176 if (Proto->getNumArgs() > 0) { 3177 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3178 3179 // Delete the parameters. 3180 D.getTypeObject(0).Fun.freeArgs(); 3181 D.setInvalidType(); 3182 } else if (Proto->isVariadic()) { 3183 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3184 D.setInvalidType(); 3185 } 3186 3187 // Diagnose "&operator bool()" and other such nonsense. This 3188 // is actually a gcc extension which we don't support. 3189 if (Proto->getResultType() != ConvType) { 3190 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3191 << Proto->getResultType(); 3192 D.setInvalidType(); 3193 ConvType = Proto->getResultType(); 3194 } 3195 3196 // C++ [class.conv.fct]p4: 3197 // The conversion-type-id shall not represent a function type nor 3198 // an array type. 3199 if (ConvType->isArrayType()) { 3200 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3201 ConvType = Context.getPointerType(ConvType); 3202 D.setInvalidType(); 3203 } else if (ConvType->isFunctionType()) { 3204 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3205 ConvType = Context.getPointerType(ConvType); 3206 D.setInvalidType(); 3207 } 3208 3209 // Rebuild the function type "R" without any parameters (in case any 3210 // of the errors above fired) and with the conversion type as the 3211 // return type. 3212 if (D.isInvalidType()) { 3213 R = Context.getFunctionType(ConvType, 0, 0, false, 3214 Proto->getTypeQuals(), 3215 Proto->hasExceptionSpec(), 3216 Proto->hasAnyExceptionSpec(), 3217 Proto->getNumExceptions(), 3218 Proto->exception_begin(), 3219 Proto->getExtInfo()); 3220 } 3221 3222 // C++0x explicit conversion operators. 3223 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3224 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3225 diag::warn_explicit_conversion_functions) 3226 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3227} 3228 3229/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3230/// the declaration of the given C++ conversion function. This routine 3231/// is responsible for recording the conversion function in the C++ 3232/// class, if possible. 3233Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3234 assert(Conversion && "Expected to receive a conversion function declaration"); 3235 3236 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3237 3238 // Make sure we aren't redeclaring the conversion function. 3239 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3240 3241 // C++ [class.conv.fct]p1: 3242 // [...] A conversion function is never used to convert a 3243 // (possibly cv-qualified) object to the (possibly cv-qualified) 3244 // same object type (or a reference to it), to a (possibly 3245 // cv-qualified) base class of that type (or a reference to it), 3246 // or to (possibly cv-qualified) void. 3247 // FIXME: Suppress this warning if the conversion function ends up being a 3248 // virtual function that overrides a virtual function in a base class. 3249 QualType ClassType 3250 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3251 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3252 ConvType = ConvTypeRef->getPointeeType(); 3253 if (ConvType->isRecordType()) { 3254 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3255 if (ConvType == ClassType) 3256 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3257 << ClassType; 3258 else if (IsDerivedFrom(ClassType, ConvType)) 3259 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3260 << ClassType << ConvType; 3261 } else if (ConvType->isVoidType()) { 3262 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3263 << ClassType << ConvType; 3264 } 3265 3266 if (Conversion->getPrimaryTemplate()) { 3267 // ignore specializations 3268 } else if (Conversion->getPreviousDeclaration()) { 3269 if (FunctionTemplateDecl *ConversionTemplate 3270 = Conversion->getDescribedFunctionTemplate()) { 3271 if (ClassDecl->replaceConversion( 3272 ConversionTemplate->getPreviousDeclaration(), 3273 ConversionTemplate)) 3274 return DeclPtrTy::make(ConversionTemplate); 3275 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3276 Conversion)) 3277 return DeclPtrTy::make(Conversion); 3278 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3279 } else if (FunctionTemplateDecl *ConversionTemplate 3280 = Conversion->getDescribedFunctionTemplate()) 3281 ClassDecl->addConversionFunction(ConversionTemplate); 3282 else 3283 ClassDecl->addConversionFunction(Conversion); 3284 3285 return DeclPtrTy::make(Conversion); 3286} 3287 3288//===----------------------------------------------------------------------===// 3289// Namespace Handling 3290//===----------------------------------------------------------------------===// 3291 3292/// ActOnStartNamespaceDef - This is called at the start of a namespace 3293/// definition. 3294Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3295 SourceLocation IdentLoc, 3296 IdentifierInfo *II, 3297 SourceLocation LBrace, 3298 AttributeList *AttrList) { 3299 NamespaceDecl *Namespc = 3300 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3301 Namespc->setLBracLoc(LBrace); 3302 3303 Scope *DeclRegionScope = NamespcScope->getParent(); 3304 3305 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3306 3307 if (II) { 3308 // C++ [namespace.def]p2: 3309 // The identifier in an original-namespace-definition shall not have been 3310 // previously defined in the declarative region in which the 3311 // original-namespace-definition appears. The identifier in an 3312 // original-namespace-definition is the name of the namespace. Subsequently 3313 // in that declarative region, it is treated as an original-namespace-name. 3314 3315 NamedDecl *PrevDecl 3316 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3317 ForRedeclaration); 3318 3319 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3320 // This is an extended namespace definition. 3321 // Attach this namespace decl to the chain of extended namespace 3322 // definitions. 3323 OrigNS->setNextNamespace(Namespc); 3324 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3325 3326 // Remove the previous declaration from the scope. 3327 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3328 IdResolver.RemoveDecl(OrigNS); 3329 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3330 } 3331 } else if (PrevDecl) { 3332 // This is an invalid name redefinition. 3333 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3334 << Namespc->getDeclName(); 3335 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3336 Namespc->setInvalidDecl(); 3337 // Continue on to push Namespc as current DeclContext and return it. 3338 } else if (II->isStr("std") && 3339 CurContext->getLookupContext()->isTranslationUnit()) { 3340 // This is the first "real" definition of the namespace "std", so update 3341 // our cache of the "std" namespace to point at this definition. 3342 if (StdNamespace) { 3343 // We had already defined a dummy namespace "std". Link this new 3344 // namespace definition to the dummy namespace "std". 3345 StdNamespace->setNextNamespace(Namespc); 3346 StdNamespace->setLocation(IdentLoc); 3347 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3348 } 3349 3350 // Make our StdNamespace cache point at the first real definition of the 3351 // "std" namespace. 3352 StdNamespace = Namespc; 3353 } 3354 3355 PushOnScopeChains(Namespc, DeclRegionScope); 3356 } else { 3357 // Anonymous namespaces. 3358 assert(Namespc->isAnonymousNamespace()); 3359 3360 // Link the anonymous namespace into its parent. 3361 NamespaceDecl *PrevDecl; 3362 DeclContext *Parent = CurContext->getLookupContext(); 3363 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3364 PrevDecl = TU->getAnonymousNamespace(); 3365 TU->setAnonymousNamespace(Namespc); 3366 } else { 3367 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3368 PrevDecl = ND->getAnonymousNamespace(); 3369 ND->setAnonymousNamespace(Namespc); 3370 } 3371 3372 // Link the anonymous namespace with its previous declaration. 3373 if (PrevDecl) { 3374 assert(PrevDecl->isAnonymousNamespace()); 3375 assert(!PrevDecl->getNextNamespace()); 3376 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3377 PrevDecl->setNextNamespace(Namespc); 3378 } 3379 3380 CurContext->addDecl(Namespc); 3381 3382 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3383 // behaves as if it were replaced by 3384 // namespace unique { /* empty body */ } 3385 // using namespace unique; 3386 // namespace unique { namespace-body } 3387 // where all occurrences of 'unique' in a translation unit are 3388 // replaced by the same identifier and this identifier differs 3389 // from all other identifiers in the entire program. 3390 3391 // We just create the namespace with an empty name and then add an 3392 // implicit using declaration, just like the standard suggests. 3393 // 3394 // CodeGen enforces the "universally unique" aspect by giving all 3395 // declarations semantically contained within an anonymous 3396 // namespace internal linkage. 3397 3398 if (!PrevDecl) { 3399 UsingDirectiveDecl* UD 3400 = UsingDirectiveDecl::Create(Context, CurContext, 3401 /* 'using' */ LBrace, 3402 /* 'namespace' */ SourceLocation(), 3403 /* qualifier */ SourceRange(), 3404 /* NNS */ NULL, 3405 /* identifier */ SourceLocation(), 3406 Namespc, 3407 /* Ancestor */ CurContext); 3408 UD->setImplicit(); 3409 CurContext->addDecl(UD); 3410 } 3411 } 3412 3413 // Although we could have an invalid decl (i.e. the namespace name is a 3414 // redefinition), push it as current DeclContext and try to continue parsing. 3415 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3416 // for the namespace has the declarations that showed up in that particular 3417 // namespace definition. 3418 PushDeclContext(NamespcScope, Namespc); 3419 return DeclPtrTy::make(Namespc); 3420} 3421 3422/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3423/// is a namespace alias, returns the namespace it points to. 3424static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3425 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3426 return AD->getNamespace(); 3427 return dyn_cast_or_null<NamespaceDecl>(D); 3428} 3429 3430/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3431/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3432void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3433 Decl *Dcl = D.getAs<Decl>(); 3434 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3435 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3436 Namespc->setRBracLoc(RBrace); 3437 PopDeclContext(); 3438} 3439 3440Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3441 SourceLocation UsingLoc, 3442 SourceLocation NamespcLoc, 3443 CXXScopeSpec &SS, 3444 SourceLocation IdentLoc, 3445 IdentifierInfo *NamespcName, 3446 AttributeList *AttrList) { 3447 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3448 assert(NamespcName && "Invalid NamespcName."); 3449 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3450 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3451 3452 UsingDirectiveDecl *UDir = 0; 3453 3454 // Lookup namespace name. 3455 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3456 LookupParsedName(R, S, &SS); 3457 if (R.isAmbiguous()) 3458 return DeclPtrTy(); 3459 3460 if (!R.empty()) { 3461 NamedDecl *Named = R.getFoundDecl(); 3462 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3463 && "expected namespace decl"); 3464 // C++ [namespace.udir]p1: 3465 // A using-directive specifies that the names in the nominated 3466 // namespace can be used in the scope in which the 3467 // using-directive appears after the using-directive. During 3468 // unqualified name lookup (3.4.1), the names appear as if they 3469 // were declared in the nearest enclosing namespace which 3470 // contains both the using-directive and the nominated 3471 // namespace. [Note: in this context, "contains" means "contains 3472 // directly or indirectly". ] 3473 3474 // Find enclosing context containing both using-directive and 3475 // nominated namespace. 3476 NamespaceDecl *NS = getNamespaceDecl(Named); 3477 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3478 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3479 CommonAncestor = CommonAncestor->getParent(); 3480 3481 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3482 SS.getRange(), 3483 (NestedNameSpecifier *)SS.getScopeRep(), 3484 IdentLoc, Named, CommonAncestor); 3485 PushUsingDirective(S, UDir); 3486 } else { 3487 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3488 } 3489 3490 // FIXME: We ignore attributes for now. 3491 delete AttrList; 3492 return DeclPtrTy::make(UDir); 3493} 3494 3495void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3496 // If scope has associated entity, then using directive is at namespace 3497 // or translation unit scope. We add UsingDirectiveDecls, into 3498 // it's lookup structure. 3499 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3500 Ctx->addDecl(UDir); 3501 else 3502 // Otherwise it is block-sope. using-directives will affect lookup 3503 // only to the end of scope. 3504 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3505} 3506 3507 3508Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3509 AccessSpecifier AS, 3510 bool HasUsingKeyword, 3511 SourceLocation UsingLoc, 3512 CXXScopeSpec &SS, 3513 UnqualifiedId &Name, 3514 AttributeList *AttrList, 3515 bool IsTypeName, 3516 SourceLocation TypenameLoc) { 3517 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3518 3519 switch (Name.getKind()) { 3520 case UnqualifiedId::IK_Identifier: 3521 case UnqualifiedId::IK_OperatorFunctionId: 3522 case UnqualifiedId::IK_LiteralOperatorId: 3523 case UnqualifiedId::IK_ConversionFunctionId: 3524 break; 3525 3526 case UnqualifiedId::IK_ConstructorName: 3527 case UnqualifiedId::IK_ConstructorTemplateId: 3528 // C++0x inherited constructors. 3529 if (getLangOptions().CPlusPlus0x) break; 3530 3531 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3532 << SS.getRange(); 3533 return DeclPtrTy(); 3534 3535 case UnqualifiedId::IK_DestructorName: 3536 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3537 << SS.getRange(); 3538 return DeclPtrTy(); 3539 3540 case UnqualifiedId::IK_TemplateId: 3541 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3542 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3543 return DeclPtrTy(); 3544 } 3545 3546 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3547 if (!TargetName) 3548 return DeclPtrTy(); 3549 3550 // Warn about using declarations. 3551 // TODO: store that the declaration was written without 'using' and 3552 // talk about access decls instead of using decls in the 3553 // diagnostics. 3554 if (!HasUsingKeyword) { 3555 UsingLoc = Name.getSourceRange().getBegin(); 3556 3557 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3558 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3559 } 3560 3561 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3562 Name.getSourceRange().getBegin(), 3563 TargetName, AttrList, 3564 /* IsInstantiation */ false, 3565 IsTypeName, TypenameLoc); 3566 if (UD) 3567 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3568 3569 return DeclPtrTy::make(UD); 3570} 3571 3572/// Determines whether to create a using shadow decl for a particular 3573/// decl, given the set of decls existing prior to this using lookup. 3574bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3575 const LookupResult &Previous) { 3576 // Diagnose finding a decl which is not from a base class of the 3577 // current class. We do this now because there are cases where this 3578 // function will silently decide not to build a shadow decl, which 3579 // will pre-empt further diagnostics. 3580 // 3581 // We don't need to do this in C++0x because we do the check once on 3582 // the qualifier. 3583 // 3584 // FIXME: diagnose the following if we care enough: 3585 // struct A { int foo; }; 3586 // struct B : A { using A::foo; }; 3587 // template <class T> struct C : A {}; 3588 // template <class T> struct D : C<T> { using B::foo; } // <--- 3589 // This is invalid (during instantiation) in C++03 because B::foo 3590 // resolves to the using decl in B, which is not a base class of D<T>. 3591 // We can't diagnose it immediately because C<T> is an unknown 3592 // specialization. The UsingShadowDecl in D<T> then points directly 3593 // to A::foo, which will look well-formed when we instantiate. 3594 // The right solution is to not collapse the shadow-decl chain. 3595 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3596 DeclContext *OrigDC = Orig->getDeclContext(); 3597 3598 // Handle enums and anonymous structs. 3599 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3600 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3601 while (OrigRec->isAnonymousStructOrUnion()) 3602 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3603 3604 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3605 if (OrigDC == CurContext) { 3606 Diag(Using->getLocation(), 3607 diag::err_using_decl_nested_name_specifier_is_current_class) 3608 << Using->getNestedNameRange(); 3609 Diag(Orig->getLocation(), diag::note_using_decl_target); 3610 return true; 3611 } 3612 3613 Diag(Using->getNestedNameRange().getBegin(), 3614 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3615 << Using->getTargetNestedNameDecl() 3616 << cast<CXXRecordDecl>(CurContext) 3617 << Using->getNestedNameRange(); 3618 Diag(Orig->getLocation(), diag::note_using_decl_target); 3619 return true; 3620 } 3621 } 3622 3623 if (Previous.empty()) return false; 3624 3625 NamedDecl *Target = Orig; 3626 if (isa<UsingShadowDecl>(Target)) 3627 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3628 3629 // If the target happens to be one of the previous declarations, we 3630 // don't have a conflict. 3631 // 3632 // FIXME: but we might be increasing its access, in which case we 3633 // should redeclare it. 3634 NamedDecl *NonTag = 0, *Tag = 0; 3635 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3636 I != E; ++I) { 3637 NamedDecl *D = (*I)->getUnderlyingDecl(); 3638 if (D->getCanonicalDecl() == Target->getCanonicalDecl()) 3639 return false; 3640 3641 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3642 } 3643 3644 if (Target->isFunctionOrFunctionTemplate()) { 3645 FunctionDecl *FD; 3646 if (isa<FunctionTemplateDecl>(Target)) 3647 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3648 else 3649 FD = cast<FunctionDecl>(Target); 3650 3651 NamedDecl *OldDecl = 0; 3652 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3653 case Ovl_Overload: 3654 return false; 3655 3656 case Ovl_NonFunction: 3657 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3658 break; 3659 3660 // We found a decl with the exact signature. 3661 case Ovl_Match: 3662 // If we're in a record, we want to hide the target, so we 3663 // return true (without a diagnostic) to tell the caller not to 3664 // build a shadow decl. 3665 if (CurContext->isRecord()) 3666 return true; 3667 3668 // If we're not in a record, this is an error. 3669 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3670 break; 3671 } 3672 3673 Diag(Target->getLocation(), diag::note_using_decl_target); 3674 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3675 return true; 3676 } 3677 3678 // Target is not a function. 3679 3680 if (isa<TagDecl>(Target)) { 3681 // No conflict between a tag and a non-tag. 3682 if (!Tag) return false; 3683 3684 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3685 Diag(Target->getLocation(), diag::note_using_decl_target); 3686 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3687 return true; 3688 } 3689 3690 // No conflict between a tag and a non-tag. 3691 if (!NonTag) return false; 3692 3693 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3694 Diag(Target->getLocation(), diag::note_using_decl_target); 3695 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3696 return true; 3697} 3698 3699/// Builds a shadow declaration corresponding to a 'using' declaration. 3700UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3701 UsingDecl *UD, 3702 NamedDecl *Orig) { 3703 3704 // If we resolved to another shadow declaration, just coalesce them. 3705 NamedDecl *Target = Orig; 3706 if (isa<UsingShadowDecl>(Target)) { 3707 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3708 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3709 } 3710 3711 UsingShadowDecl *Shadow 3712 = UsingShadowDecl::Create(Context, CurContext, 3713 UD->getLocation(), UD, Target); 3714 UD->addShadowDecl(Shadow); 3715 3716 if (S) 3717 PushOnScopeChains(Shadow, S); 3718 else 3719 CurContext->addDecl(Shadow); 3720 Shadow->setAccess(UD->getAccess()); 3721 3722 // Register it as a conversion if appropriate. 3723 if (Shadow->getDeclName().getNameKind() 3724 == DeclarationName::CXXConversionFunctionName) 3725 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3726 3727 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3728 Shadow->setInvalidDecl(); 3729 3730 return Shadow; 3731} 3732 3733/// Hides a using shadow declaration. This is required by the current 3734/// using-decl implementation when a resolvable using declaration in a 3735/// class is followed by a declaration which would hide or override 3736/// one or more of the using decl's targets; for example: 3737/// 3738/// struct Base { void foo(int); }; 3739/// struct Derived : Base { 3740/// using Base::foo; 3741/// void foo(int); 3742/// }; 3743/// 3744/// The governing language is C++03 [namespace.udecl]p12: 3745/// 3746/// When a using-declaration brings names from a base class into a 3747/// derived class scope, member functions in the derived class 3748/// override and/or hide member functions with the same name and 3749/// parameter types in a base class (rather than conflicting). 3750/// 3751/// There are two ways to implement this: 3752/// (1) optimistically create shadow decls when they're not hidden 3753/// by existing declarations, or 3754/// (2) don't create any shadow decls (or at least don't make them 3755/// visible) until we've fully parsed/instantiated the class. 3756/// The problem with (1) is that we might have to retroactively remove 3757/// a shadow decl, which requires several O(n) operations because the 3758/// decl structures are (very reasonably) not designed for removal. 3759/// (2) avoids this but is very fiddly and phase-dependent. 3760void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3761 if (Shadow->getDeclName().getNameKind() == 3762 DeclarationName::CXXConversionFunctionName) 3763 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3764 3765 // Remove it from the DeclContext... 3766 Shadow->getDeclContext()->removeDecl(Shadow); 3767 3768 // ...and the scope, if applicable... 3769 if (S) { 3770 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3771 IdResolver.RemoveDecl(Shadow); 3772 } 3773 3774 // ...and the using decl. 3775 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3776 3777 // TODO: complain somehow if Shadow was used. It shouldn't 3778 // be possible for this to happen, because...? 3779} 3780 3781/// Builds a using declaration. 3782/// 3783/// \param IsInstantiation - Whether this call arises from an 3784/// instantiation of an unresolved using declaration. We treat 3785/// the lookup differently for these declarations. 3786NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3787 SourceLocation UsingLoc, 3788 CXXScopeSpec &SS, 3789 SourceLocation IdentLoc, 3790 DeclarationName Name, 3791 AttributeList *AttrList, 3792 bool IsInstantiation, 3793 bool IsTypeName, 3794 SourceLocation TypenameLoc) { 3795 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3796 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3797 3798 // FIXME: We ignore attributes for now. 3799 delete AttrList; 3800 3801 if (SS.isEmpty()) { 3802 Diag(IdentLoc, diag::err_using_requires_qualname); 3803 return 0; 3804 } 3805 3806 // Do the redeclaration lookup in the current scope. 3807 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3808 ForRedeclaration); 3809 Previous.setHideTags(false); 3810 if (S) { 3811 LookupName(Previous, S); 3812 3813 // It is really dumb that we have to do this. 3814 LookupResult::Filter F = Previous.makeFilter(); 3815 while (F.hasNext()) { 3816 NamedDecl *D = F.next(); 3817 if (!isDeclInScope(D, CurContext, S)) 3818 F.erase(); 3819 } 3820 F.done(); 3821 } else { 3822 assert(IsInstantiation && "no scope in non-instantiation"); 3823 assert(CurContext->isRecord() && "scope not record in instantiation"); 3824 LookupQualifiedName(Previous, CurContext); 3825 } 3826 3827 NestedNameSpecifier *NNS = 3828 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3829 3830 // Check for invalid redeclarations. 3831 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3832 return 0; 3833 3834 // Check for bad qualifiers. 3835 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3836 return 0; 3837 3838 DeclContext *LookupContext = computeDeclContext(SS); 3839 NamedDecl *D; 3840 if (!LookupContext) { 3841 if (IsTypeName) { 3842 // FIXME: not all declaration name kinds are legal here 3843 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3844 UsingLoc, TypenameLoc, 3845 SS.getRange(), NNS, 3846 IdentLoc, Name); 3847 } else { 3848 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3849 UsingLoc, SS.getRange(), NNS, 3850 IdentLoc, Name); 3851 } 3852 } else { 3853 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3854 SS.getRange(), UsingLoc, NNS, Name, 3855 IsTypeName); 3856 } 3857 D->setAccess(AS); 3858 CurContext->addDecl(D); 3859 3860 if (!LookupContext) return D; 3861 UsingDecl *UD = cast<UsingDecl>(D); 3862 3863 if (RequireCompleteDeclContext(SS, LookupContext)) { 3864 UD->setInvalidDecl(); 3865 return UD; 3866 } 3867 3868 // Look up the target name. 3869 3870 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3871 3872 // Unlike most lookups, we don't always want to hide tag 3873 // declarations: tag names are visible through the using declaration 3874 // even if hidden by ordinary names, *except* in a dependent context 3875 // where it's important for the sanity of two-phase lookup. 3876 if (!IsInstantiation) 3877 R.setHideTags(false); 3878 3879 LookupQualifiedName(R, LookupContext); 3880 3881 if (R.empty()) { 3882 Diag(IdentLoc, diag::err_no_member) 3883 << Name << LookupContext << SS.getRange(); 3884 UD->setInvalidDecl(); 3885 return UD; 3886 } 3887 3888 if (R.isAmbiguous()) { 3889 UD->setInvalidDecl(); 3890 return UD; 3891 } 3892 3893 if (IsTypeName) { 3894 // If we asked for a typename and got a non-type decl, error out. 3895 if (!R.getAsSingle<TypeDecl>()) { 3896 Diag(IdentLoc, diag::err_using_typename_non_type); 3897 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3898 Diag((*I)->getUnderlyingDecl()->getLocation(), 3899 diag::note_using_decl_target); 3900 UD->setInvalidDecl(); 3901 return UD; 3902 } 3903 } else { 3904 // If we asked for a non-typename and we got a type, error out, 3905 // but only if this is an instantiation of an unresolved using 3906 // decl. Otherwise just silently find the type name. 3907 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3908 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3909 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3910 UD->setInvalidDecl(); 3911 return UD; 3912 } 3913 } 3914 3915 // C++0x N2914 [namespace.udecl]p6: 3916 // A using-declaration shall not name a namespace. 3917 if (R.getAsSingle<NamespaceDecl>()) { 3918 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3919 << SS.getRange(); 3920 UD->setInvalidDecl(); 3921 return UD; 3922 } 3923 3924 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3925 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3926 BuildUsingShadowDecl(S, UD, *I); 3927 } 3928 3929 return UD; 3930} 3931 3932/// Checks that the given using declaration is not an invalid 3933/// redeclaration. Note that this is checking only for the using decl 3934/// itself, not for any ill-formedness among the UsingShadowDecls. 3935bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3936 bool isTypeName, 3937 const CXXScopeSpec &SS, 3938 SourceLocation NameLoc, 3939 const LookupResult &Prev) { 3940 // C++03 [namespace.udecl]p8: 3941 // C++0x [namespace.udecl]p10: 3942 // A using-declaration is a declaration and can therefore be used 3943 // repeatedly where (and only where) multiple declarations are 3944 // allowed. 3945 // 3946 // That's in non-member contexts. 3947 if (!CurContext->getLookupContext()->isRecord()) 3948 return false; 3949 3950 NestedNameSpecifier *Qual 3951 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3952 3953 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3954 NamedDecl *D = *I; 3955 3956 bool DTypename; 3957 NestedNameSpecifier *DQual; 3958 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3959 DTypename = UD->isTypeName(); 3960 DQual = UD->getTargetNestedNameDecl(); 3961 } else if (UnresolvedUsingValueDecl *UD 3962 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3963 DTypename = false; 3964 DQual = UD->getTargetNestedNameSpecifier(); 3965 } else if (UnresolvedUsingTypenameDecl *UD 3966 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3967 DTypename = true; 3968 DQual = UD->getTargetNestedNameSpecifier(); 3969 } else continue; 3970 3971 // using decls differ if one says 'typename' and the other doesn't. 3972 // FIXME: non-dependent using decls? 3973 if (isTypeName != DTypename) continue; 3974 3975 // using decls differ if they name different scopes (but note that 3976 // template instantiation can cause this check to trigger when it 3977 // didn't before instantiation). 3978 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3979 Context.getCanonicalNestedNameSpecifier(DQual)) 3980 continue; 3981 3982 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3983 Diag(D->getLocation(), diag::note_using_decl) << 1; 3984 return true; 3985 } 3986 3987 return false; 3988} 3989 3990 3991/// Checks that the given nested-name qualifier used in a using decl 3992/// in the current context is appropriately related to the current 3993/// scope. If an error is found, diagnoses it and returns true. 3994bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3995 const CXXScopeSpec &SS, 3996 SourceLocation NameLoc) { 3997 DeclContext *NamedContext = computeDeclContext(SS); 3998 3999 if (!CurContext->isRecord()) { 4000 // C++03 [namespace.udecl]p3: 4001 // C++0x [namespace.udecl]p8: 4002 // A using-declaration for a class member shall be a member-declaration. 4003 4004 // If we weren't able to compute a valid scope, it must be a 4005 // dependent class scope. 4006 if (!NamedContext || NamedContext->isRecord()) { 4007 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4008 << SS.getRange(); 4009 return true; 4010 } 4011 4012 // Otherwise, everything is known to be fine. 4013 return false; 4014 } 4015 4016 // The current scope is a record. 4017 4018 // If the named context is dependent, we can't decide much. 4019 if (!NamedContext) { 4020 // FIXME: in C++0x, we can diagnose if we can prove that the 4021 // nested-name-specifier does not refer to a base class, which is 4022 // still possible in some cases. 4023 4024 // Otherwise we have to conservatively report that things might be 4025 // okay. 4026 return false; 4027 } 4028 4029 if (!NamedContext->isRecord()) { 4030 // Ideally this would point at the last name in the specifier, 4031 // but we don't have that level of source info. 4032 Diag(SS.getRange().getBegin(), 4033 diag::err_using_decl_nested_name_specifier_is_not_class) 4034 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4035 return true; 4036 } 4037 4038 if (getLangOptions().CPlusPlus0x) { 4039 // C++0x [namespace.udecl]p3: 4040 // In a using-declaration used as a member-declaration, the 4041 // nested-name-specifier shall name a base class of the class 4042 // being defined. 4043 4044 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4045 cast<CXXRecordDecl>(NamedContext))) { 4046 if (CurContext == NamedContext) { 4047 Diag(NameLoc, 4048 diag::err_using_decl_nested_name_specifier_is_current_class) 4049 << SS.getRange(); 4050 return true; 4051 } 4052 4053 Diag(SS.getRange().getBegin(), 4054 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4055 << (NestedNameSpecifier*) SS.getScopeRep() 4056 << cast<CXXRecordDecl>(CurContext) 4057 << SS.getRange(); 4058 return true; 4059 } 4060 4061 return false; 4062 } 4063 4064 // C++03 [namespace.udecl]p4: 4065 // A using-declaration used as a member-declaration shall refer 4066 // to a member of a base class of the class being defined [etc.]. 4067 4068 // Salient point: SS doesn't have to name a base class as long as 4069 // lookup only finds members from base classes. Therefore we can 4070 // diagnose here only if we can prove that that can't happen, 4071 // i.e. if the class hierarchies provably don't intersect. 4072 4073 // TODO: it would be nice if "definitely valid" results were cached 4074 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4075 // need to be repeated. 4076 4077 struct UserData { 4078 llvm::DenseSet<const CXXRecordDecl*> Bases; 4079 4080 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4081 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4082 Data->Bases.insert(Base); 4083 return true; 4084 } 4085 4086 bool hasDependentBases(const CXXRecordDecl *Class) { 4087 return !Class->forallBases(collect, this); 4088 } 4089 4090 /// Returns true if the base is dependent or is one of the 4091 /// accumulated base classes. 4092 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4093 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4094 return !Data->Bases.count(Base); 4095 } 4096 4097 bool mightShareBases(const CXXRecordDecl *Class) { 4098 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4099 } 4100 }; 4101 4102 UserData Data; 4103 4104 // Returns false if we find a dependent base. 4105 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4106 return false; 4107 4108 // Returns false if the class has a dependent base or if it or one 4109 // of its bases is present in the base set of the current context. 4110 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4111 return false; 4112 4113 Diag(SS.getRange().getBegin(), 4114 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4115 << (NestedNameSpecifier*) SS.getScopeRep() 4116 << cast<CXXRecordDecl>(CurContext) 4117 << SS.getRange(); 4118 4119 return true; 4120} 4121 4122Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 4123 SourceLocation NamespaceLoc, 4124 SourceLocation AliasLoc, 4125 IdentifierInfo *Alias, 4126 CXXScopeSpec &SS, 4127 SourceLocation IdentLoc, 4128 IdentifierInfo *Ident) { 4129 4130 // Lookup the namespace name. 4131 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4132 LookupParsedName(R, S, &SS); 4133 4134 // Check if we have a previous declaration with the same name. 4135 NamedDecl *PrevDecl 4136 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4137 ForRedeclaration); 4138 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4139 PrevDecl = 0; 4140 4141 if (PrevDecl) { 4142 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4143 // We already have an alias with the same name that points to the same 4144 // namespace, so don't create a new one. 4145 // FIXME: At some point, we'll want to create the (redundant) 4146 // declaration to maintain better source information. 4147 if (!R.isAmbiguous() && !R.empty() && 4148 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4149 return DeclPtrTy(); 4150 } 4151 4152 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4153 diag::err_redefinition_different_kind; 4154 Diag(AliasLoc, DiagID) << Alias; 4155 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4156 return DeclPtrTy(); 4157 } 4158 4159 if (R.isAmbiguous()) 4160 return DeclPtrTy(); 4161 4162 if (R.empty()) { 4163 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4164 return DeclPtrTy(); 4165 } 4166 4167 NamespaceAliasDecl *AliasDecl = 4168 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4169 Alias, SS.getRange(), 4170 (NestedNameSpecifier *)SS.getScopeRep(), 4171 IdentLoc, R.getFoundDecl()); 4172 4173 PushOnScopeChains(AliasDecl, S); 4174 return DeclPtrTy::make(AliasDecl); 4175} 4176 4177namespace { 4178 /// \brief Scoped object used to handle the state changes required in Sema 4179 /// to implicitly define the body of a C++ member function; 4180 class ImplicitlyDefinedFunctionScope { 4181 Sema &S; 4182 DeclContext *PreviousContext; 4183 4184 public: 4185 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4186 : S(S), PreviousContext(S.CurContext) 4187 { 4188 S.CurContext = Method; 4189 S.PushFunctionScope(); 4190 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4191 } 4192 4193 ~ImplicitlyDefinedFunctionScope() { 4194 S.PopExpressionEvaluationContext(); 4195 S.PopFunctionOrBlockScope(); 4196 S.CurContext = PreviousContext; 4197 } 4198 }; 4199} 4200 4201void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4202 CXXConstructorDecl *Constructor) { 4203 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4204 !Constructor->isUsed()) && 4205 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4206 4207 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4208 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4209 4210 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4211 ErrorTrap Trap(*this); 4212 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4213 Trap.hasErrorOccurred()) { 4214 Diag(CurrentLocation, diag::note_member_synthesized_at) 4215 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4216 Constructor->setInvalidDecl(); 4217 } else { 4218 Constructor->setUsed(); 4219 MarkVTableUsed(CurrentLocation, ClassDecl); 4220 } 4221} 4222 4223void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4224 CXXDestructorDecl *Destructor) { 4225 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 4226 "DefineImplicitDestructor - call it for implicit default dtor"); 4227 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4228 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4229 4230 if (Destructor->isInvalidDecl()) 4231 return; 4232 4233 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4234 4235 ErrorTrap Trap(*this); 4236 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4237 Destructor->getParent()); 4238 4239 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4240 Diag(CurrentLocation, diag::note_member_synthesized_at) 4241 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4242 4243 Destructor->setInvalidDecl(); 4244 return; 4245 } 4246 4247 Destructor->setUsed(); 4248 MarkVTableUsed(CurrentLocation, ClassDecl); 4249} 4250 4251/// \brief Builds a statement that copies the given entity from \p From to 4252/// \c To. 4253/// 4254/// This routine is used to copy the members of a class with an 4255/// implicitly-declared copy assignment operator. When the entities being 4256/// copied are arrays, this routine builds for loops to copy them. 4257/// 4258/// \param S The Sema object used for type-checking. 4259/// 4260/// \param Loc The location where the implicit copy is being generated. 4261/// 4262/// \param T The type of the expressions being copied. Both expressions must 4263/// have this type. 4264/// 4265/// \param To The expression we are copying to. 4266/// 4267/// \param From The expression we are copying from. 4268/// 4269/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4270/// Otherwise, it's a non-static member subobject. 4271/// 4272/// \param Depth Internal parameter recording the depth of the recursion. 4273/// 4274/// \returns A statement or a loop that copies the expressions. 4275static Sema::OwningStmtResult 4276BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4277 Sema::OwningExprResult To, Sema::OwningExprResult From, 4278 bool CopyingBaseSubobject, unsigned Depth = 0) { 4279 typedef Sema::OwningStmtResult OwningStmtResult; 4280 typedef Sema::OwningExprResult OwningExprResult; 4281 4282 // C++0x [class.copy]p30: 4283 // Each subobject is assigned in the manner appropriate to its type: 4284 // 4285 // - if the subobject is of class type, the copy assignment operator 4286 // for the class is used (as if by explicit qualification; that is, 4287 // ignoring any possible virtual overriding functions in more derived 4288 // classes); 4289 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4290 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4291 4292 // Look for operator=. 4293 DeclarationName Name 4294 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4295 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4296 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4297 4298 // Filter out any result that isn't a copy-assignment operator. 4299 LookupResult::Filter F = OpLookup.makeFilter(); 4300 while (F.hasNext()) { 4301 NamedDecl *D = F.next(); 4302 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4303 if (Method->isCopyAssignmentOperator()) 4304 continue; 4305 4306 F.erase(); 4307 } 4308 F.done(); 4309 4310 // Suppress the protected check (C++ [class.protected]) for each of the 4311 // assignment operators we found. This strange dance is required when 4312 // we're assigning via a base classes's copy-assignment operator. To 4313 // ensure that we're getting the right base class subobject (without 4314 // ambiguities), we need to cast "this" to that subobject type; to 4315 // ensure that we don't go through the virtual call mechanism, we need 4316 // to qualify the operator= name with the base class (see below). However, 4317 // this means that if the base class has a protected copy assignment 4318 // operator, the protected member access check will fail. So, we 4319 // rewrite "protected" access to "public" access in this case, since we 4320 // know by construction that we're calling from a derived class. 4321 if (CopyingBaseSubobject) { 4322 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4323 L != LEnd; ++L) { 4324 if (L.getAccess() == AS_protected) 4325 L.setAccess(AS_public); 4326 } 4327 } 4328 4329 // Create the nested-name-specifier that will be used to qualify the 4330 // reference to operator=; this is required to suppress the virtual 4331 // call mechanism. 4332 CXXScopeSpec SS; 4333 SS.setRange(Loc); 4334 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4335 T.getTypePtr())); 4336 4337 // Create the reference to operator=. 4338 OwningExprResult OpEqualRef 4339 = S.BuildMemberReferenceExpr(move(To), T, Loc, /*isArrow=*/false, SS, 4340 /*FirstQualifierInScope=*/0, OpLookup, 4341 /*TemplateArgs=*/0, 4342 /*SuppressQualifierCheck=*/true); 4343 if (OpEqualRef.isInvalid()) 4344 return S.StmtError(); 4345 4346 // Build the call to the assignment operator. 4347 Expr *FromE = From.takeAs<Expr>(); 4348 OwningExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4349 OpEqualRef.takeAs<Expr>(), 4350 Loc, &FromE, 1, 0, Loc); 4351 if (Call.isInvalid()) 4352 return S.StmtError(); 4353 4354 return S.Owned(Call.takeAs<Stmt>()); 4355 } 4356 4357 // - if the subobject is of scalar type, the built-in assignment 4358 // operator is used. 4359 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4360 if (!ArrayTy) { 4361 OwningExprResult Assignment = S.CreateBuiltinBinOp(Loc, 4362 BinaryOperator::Assign, 4363 To.takeAs<Expr>(), 4364 From.takeAs<Expr>()); 4365 if (Assignment.isInvalid()) 4366 return S.StmtError(); 4367 4368 return S.Owned(Assignment.takeAs<Stmt>()); 4369 } 4370 4371 // - if the subobject is an array, each element is assigned, in the 4372 // manner appropriate to the element type; 4373 4374 // Construct a loop over the array bounds, e.g., 4375 // 4376 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4377 // 4378 // that will copy each of the array elements. 4379 QualType SizeType = S.Context.getSizeType(); 4380 4381 // Create the iteration variable. 4382 IdentifierInfo *IterationVarName = 0; 4383 { 4384 llvm::SmallString<8> Str; 4385 llvm::raw_svector_ostream OS(Str); 4386 OS << "__i" << Depth; 4387 IterationVarName = &S.Context.Idents.get(OS.str()); 4388 } 4389 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4390 IterationVarName, SizeType, 4391 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4392 VarDecl::None, VarDecl::None); 4393 4394 // Initialize the iteration variable to zero. 4395 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4396 IterationVar->setInit(new (S.Context) IntegerLiteral(Zero, SizeType, Loc)); 4397 4398 // Create a reference to the iteration variable; we'll use this several 4399 // times throughout. 4400 Expr *IterationVarRef 4401 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4402 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4403 4404 // Create the DeclStmt that holds the iteration variable. 4405 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4406 4407 // Create the comparison against the array bound. 4408 llvm::APInt Upper = ArrayTy->getSize(); 4409 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4410 OwningExprResult Comparison 4411 = S.Owned(new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4412 new (S.Context) IntegerLiteral(Upper, SizeType, Loc), 4413 BinaryOperator::NE, S.Context.BoolTy, Loc)); 4414 4415 // Create the pre-increment of the iteration variable. 4416 OwningExprResult Increment 4417 = S.Owned(new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4418 UnaryOperator::PreInc, 4419 SizeType, Loc)); 4420 4421 // Subscript the "from" and "to" expressions with the iteration variable. 4422 From = S.CreateBuiltinArraySubscriptExpr(move(From), Loc, 4423 S.Owned(IterationVarRef->Retain()), 4424 Loc); 4425 To = S.CreateBuiltinArraySubscriptExpr(move(To), Loc, 4426 S.Owned(IterationVarRef->Retain()), 4427 Loc); 4428 assert(!From.isInvalid() && "Builtin subscripting can't fail!"); 4429 assert(!To.isInvalid() && "Builtin subscripting can't fail!"); 4430 4431 // Build the copy for an individual element of the array. 4432 OwningStmtResult Copy = BuildSingleCopyAssign(S, Loc, 4433 ArrayTy->getElementType(), 4434 move(To), move(From), 4435 CopyingBaseSubobject, Depth+1); 4436 if (Copy.isInvalid()) { 4437 InitStmt->Destroy(S.Context); 4438 return S.StmtError(); 4439 } 4440 4441 // Construct the loop that copies all elements of this array. 4442 return S.ActOnForStmt(Loc, Loc, S.Owned(InitStmt), 4443 S.MakeFullExpr(Comparison), 4444 Sema::DeclPtrTy(), 4445 S.MakeFullExpr(Increment), 4446 Loc, move(Copy)); 4447} 4448 4449void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4450 CXXMethodDecl *CopyAssignOperator) { 4451 assert((CopyAssignOperator->isImplicit() && 4452 CopyAssignOperator->isOverloadedOperator() && 4453 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4454 !CopyAssignOperator->isUsed()) && 4455 "DefineImplicitCopyAssignment called for wrong function"); 4456 4457 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4458 4459 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4460 CopyAssignOperator->setInvalidDecl(); 4461 return; 4462 } 4463 4464 CopyAssignOperator->setUsed(); 4465 4466 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4467 ErrorTrap Trap(*this); 4468 4469 // C++0x [class.copy]p30: 4470 // The implicitly-defined or explicitly-defaulted copy assignment operator 4471 // for a non-union class X performs memberwise copy assignment of its 4472 // subobjects. The direct base classes of X are assigned first, in the 4473 // order of their declaration in the base-specifier-list, and then the 4474 // immediate non-static data members of X are assigned, in the order in 4475 // which they were declared in the class definition. 4476 4477 // The statements that form the synthesized function body. 4478 ASTOwningVector<&ActionBase::DeleteStmt> Statements(*this); 4479 4480 // The parameter for the "other" object, which we are copying from. 4481 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4482 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4483 QualType OtherRefType = Other->getType(); 4484 if (const LValueReferenceType *OtherRef 4485 = OtherRefType->getAs<LValueReferenceType>()) { 4486 OtherRefType = OtherRef->getPointeeType(); 4487 OtherQuals = OtherRefType.getQualifiers(); 4488 } 4489 4490 // Our location for everything implicitly-generated. 4491 SourceLocation Loc = CopyAssignOperator->getLocation(); 4492 4493 // Construct a reference to the "other" object. We'll be using this 4494 // throughout the generated ASTs. 4495 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4496 assert(OtherRef && "Reference to parameter cannot fail!"); 4497 4498 // Construct the "this" pointer. We'll be using this throughout the generated 4499 // ASTs. 4500 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4501 assert(This && "Reference to this cannot fail!"); 4502 4503 // Assign base classes. 4504 bool Invalid = false; 4505 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4506 E = ClassDecl->bases_end(); Base != E; ++Base) { 4507 // Form the assignment: 4508 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4509 QualType BaseType = Base->getType().getUnqualifiedType(); 4510 CXXRecordDecl *BaseClassDecl = 0; 4511 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4512 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4513 else { 4514 Invalid = true; 4515 continue; 4516 } 4517 4518 // Construct the "from" expression, which is an implicit cast to the 4519 // appropriately-qualified base type. 4520 Expr *From = OtherRef->Retain(); 4521 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4522 CastExpr::CK_UncheckedDerivedToBase, /*isLvalue=*/true, 4523 CXXBaseSpecifierArray(Base)); 4524 4525 // Dereference "this". 4526 OwningExprResult To = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4527 Owned(This->Retain())); 4528 4529 // Implicitly cast "this" to the appropriately-qualified base type. 4530 Expr *ToE = To.takeAs<Expr>(); 4531 ImpCastExprToType(ToE, 4532 Context.getCVRQualifiedType(BaseType, 4533 CopyAssignOperator->getTypeQualifiers()), 4534 CastExpr::CK_UncheckedDerivedToBase, 4535 /*isLvalue=*/true, CXXBaseSpecifierArray(Base)); 4536 To = Owned(ToE); 4537 4538 // Build the copy. 4539 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4540 move(To), Owned(From), 4541 /*CopyingBaseSubobject=*/true); 4542 if (Copy.isInvalid()) { 4543 Diag(CurrentLocation, diag::note_member_synthesized_at) 4544 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4545 CopyAssignOperator->setInvalidDecl(); 4546 return; 4547 } 4548 4549 // Success! Record the copy. 4550 Statements.push_back(Copy.takeAs<Expr>()); 4551 } 4552 4553 // \brief Reference to the __builtin_memcpy function. 4554 Expr *BuiltinMemCpyRef = 0; 4555 // \brief Reference to the objc_memmove_collectable function. 4556 Expr *CollectableMemCpyRef = 0; 4557 4558 // Assign non-static members. 4559 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4560 FieldEnd = ClassDecl->field_end(); 4561 Field != FieldEnd; ++Field) { 4562 // Check for members of reference type; we can't copy those. 4563 if (Field->getType()->isReferenceType()) { 4564 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4565 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4566 Diag(Field->getLocation(), diag::note_declared_at); 4567 Diag(CurrentLocation, diag::note_member_synthesized_at) 4568 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4569 Invalid = true; 4570 continue; 4571 } 4572 4573 // Check for members of const-qualified, non-class type. 4574 QualType BaseType = Context.getBaseElementType(Field->getType()); 4575 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4576 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4577 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4578 Diag(Field->getLocation(), diag::note_declared_at); 4579 Diag(CurrentLocation, diag::note_member_synthesized_at) 4580 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4581 Invalid = true; 4582 continue; 4583 } 4584 4585 QualType FieldType = Field->getType().getNonReferenceType(); 4586 if (FieldType->isIncompleteArrayType()) { 4587 assert(ClassDecl->hasFlexibleArrayMember() && 4588 "Incomplete array type is not valid"); 4589 continue; 4590 } 4591 4592 // Build references to the field in the object we're copying from and to. 4593 CXXScopeSpec SS; // Intentionally empty 4594 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 4595 LookupMemberName); 4596 MemberLookup.addDecl(*Field); 4597 MemberLookup.resolveKind(); 4598 OwningExprResult From = BuildMemberReferenceExpr(Owned(OtherRef->Retain()), 4599 OtherRefType, 4600 Loc, /*IsArrow=*/false, 4601 SS, 0, MemberLookup, 0); 4602 OwningExprResult To = BuildMemberReferenceExpr(Owned(This->Retain()), 4603 This->getType(), 4604 Loc, /*IsArrow=*/true, 4605 SS, 0, MemberLookup, 0); 4606 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 4607 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 4608 4609 // If the field should be copied with __builtin_memcpy rather than via 4610 // explicit assignments, do so. This optimization only applies for arrays 4611 // of scalars and arrays of class type with trivial copy-assignment 4612 // operators. 4613 if (FieldType->isArrayType() && 4614 (!BaseType->isRecordType() || 4615 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 4616 ->hasTrivialCopyAssignment())) { 4617 // Compute the size of the memory buffer to be copied. 4618 QualType SizeType = Context.getSizeType(); 4619 llvm::APInt Size(Context.getTypeSize(SizeType), 4620 Context.getTypeSizeInChars(BaseType).getQuantity()); 4621 for (const ConstantArrayType *Array 4622 = Context.getAsConstantArrayType(FieldType); 4623 Array; 4624 Array = Context.getAsConstantArrayType(Array->getElementType())) { 4625 llvm::APInt ArraySize = Array->getSize(); 4626 ArraySize.zextOrTrunc(Size.getBitWidth()); 4627 Size *= ArraySize; 4628 } 4629 4630 // Take the address of the field references for "from" and "to". 4631 From = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(From)); 4632 To = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(To)); 4633 4634 bool NeedsCollectableMemCpy = 4635 (BaseType->isRecordType() && 4636 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 4637 4638 if (NeedsCollectableMemCpy) { 4639 if (!CollectableMemCpyRef) { 4640 // Create a reference to the objc_memmove_collectable function. 4641 LookupResult R(*this, &Context.Idents.get("objc_memmove_collectable"), 4642 Loc, LookupOrdinaryName); 4643 LookupName(R, TUScope, true); 4644 4645 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 4646 if (!CollectableMemCpy) { 4647 // Something went horribly wrong earlier, and we will have 4648 // complained about it. 4649 Invalid = true; 4650 continue; 4651 } 4652 4653 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 4654 CollectableMemCpy->getType(), 4655 Loc, 0).takeAs<Expr>(); 4656 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 4657 } 4658 } 4659 // Create a reference to the __builtin_memcpy builtin function. 4660 else if (!BuiltinMemCpyRef) { 4661 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 4662 LookupOrdinaryName); 4663 LookupName(R, TUScope, true); 4664 4665 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 4666 if (!BuiltinMemCpy) { 4667 // Something went horribly wrong earlier, and we will have complained 4668 // about it. 4669 Invalid = true; 4670 continue; 4671 } 4672 4673 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 4674 BuiltinMemCpy->getType(), 4675 Loc, 0).takeAs<Expr>(); 4676 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 4677 } 4678 4679 ASTOwningVector<&ActionBase::DeleteExpr> CallArgs(*this); 4680 CallArgs.push_back(To.takeAs<Expr>()); 4681 CallArgs.push_back(From.takeAs<Expr>()); 4682 CallArgs.push_back(new (Context) IntegerLiteral(Size, SizeType, Loc)); 4683 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 4684 Commas.push_back(Loc); 4685 Commas.push_back(Loc); 4686 OwningExprResult Call = ExprError(); 4687 if (NeedsCollectableMemCpy) 4688 Call = ActOnCallExpr(/*Scope=*/0, 4689 Owned(CollectableMemCpyRef->Retain()), 4690 Loc, move_arg(CallArgs), 4691 Commas.data(), Loc); 4692 else 4693 Call = ActOnCallExpr(/*Scope=*/0, 4694 Owned(BuiltinMemCpyRef->Retain()), 4695 Loc, move_arg(CallArgs), 4696 Commas.data(), Loc); 4697 4698 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 4699 Statements.push_back(Call.takeAs<Expr>()); 4700 continue; 4701 } 4702 4703 // Build the copy of this field. 4704 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 4705 move(To), move(From), 4706 /*CopyingBaseSubobject=*/false); 4707 if (Copy.isInvalid()) { 4708 Diag(CurrentLocation, diag::note_member_synthesized_at) 4709 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4710 CopyAssignOperator->setInvalidDecl(); 4711 return; 4712 } 4713 4714 // Success! Record the copy. 4715 Statements.push_back(Copy.takeAs<Stmt>()); 4716 } 4717 4718 if (!Invalid) { 4719 // Add a "return *this;" 4720 OwningExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4721 Owned(This->Retain())); 4722 4723 OwningStmtResult Return = ActOnReturnStmt(Loc, move(ThisObj)); 4724 if (Return.isInvalid()) 4725 Invalid = true; 4726 else { 4727 Statements.push_back(Return.takeAs<Stmt>()); 4728 4729 if (Trap.hasErrorOccurred()) { 4730 Diag(CurrentLocation, diag::note_member_synthesized_at) 4731 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4732 Invalid = true; 4733 } 4734 } 4735 } 4736 4737 if (Invalid) { 4738 CopyAssignOperator->setInvalidDecl(); 4739 return; 4740 } 4741 4742 OwningStmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 4743 /*isStmtExpr=*/false); 4744 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 4745 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 4746} 4747 4748void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 4749 CXXConstructorDecl *CopyConstructor, 4750 unsigned TypeQuals) { 4751 assert((CopyConstructor->isImplicit() && 4752 CopyConstructor->isCopyConstructor(TypeQuals) && 4753 !CopyConstructor->isUsed()) && 4754 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 4755 4756 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 4757 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 4758 4759 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 4760 ErrorTrap Trap(*this); 4761 4762 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 4763 Trap.hasErrorOccurred()) { 4764 Diag(CurrentLocation, diag::note_member_synthesized_at) 4765 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 4766 CopyConstructor->setInvalidDecl(); 4767 } else { 4768 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 4769 CopyConstructor->getLocation(), 4770 MultiStmtArg(*this, 0, 0), 4771 /*isStmtExpr=*/false) 4772 .takeAs<Stmt>()); 4773 } 4774 4775 CopyConstructor->setUsed(); 4776} 4777 4778Sema::OwningExprResult 4779Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4780 CXXConstructorDecl *Constructor, 4781 MultiExprArg ExprArgs, 4782 bool RequiresZeroInit, 4783 CXXConstructExpr::ConstructionKind ConstructKind) { 4784 bool Elidable = false; 4785 4786 // C++0x [class.copy]p34: 4787 // When certain criteria are met, an implementation is allowed to 4788 // omit the copy/move construction of a class object, even if the 4789 // copy/move constructor and/or destructor for the object have 4790 // side effects. [...] 4791 // - when a temporary class object that has not been bound to a 4792 // reference (12.2) would be copied/moved to a class object 4793 // with the same cv-unqualified type, the copy/move operation 4794 // can be omitted by constructing the temporary object 4795 // directly into the target of the omitted copy/move 4796 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 4797 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 4798 Elidable = SubExpr->isTemporaryObject() && 4799 Context.hasSameUnqualifiedType(SubExpr->getType(), 4800 Context.getTypeDeclType(Constructor->getParent())); 4801 } 4802 4803 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4804 Elidable, move(ExprArgs), RequiresZeroInit, 4805 ConstructKind); 4806} 4807 4808/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4809/// including handling of its default argument expressions. 4810Sema::OwningExprResult 4811Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4812 CXXConstructorDecl *Constructor, bool Elidable, 4813 MultiExprArg ExprArgs, 4814 bool RequiresZeroInit, 4815 CXXConstructExpr::ConstructionKind ConstructKind) { 4816 unsigned NumExprs = ExprArgs.size(); 4817 Expr **Exprs = (Expr **)ExprArgs.release(); 4818 4819 MarkDeclarationReferenced(ConstructLoc, Constructor); 4820 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4821 Constructor, Elidable, Exprs, NumExprs, 4822 RequiresZeroInit, ConstructKind)); 4823} 4824 4825bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4826 CXXConstructorDecl *Constructor, 4827 MultiExprArg Exprs) { 4828 OwningExprResult TempResult = 4829 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4830 move(Exprs)); 4831 if (TempResult.isInvalid()) 4832 return true; 4833 4834 Expr *Temp = TempResult.takeAs<Expr>(); 4835 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4836 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4837 VD->setInit(Temp); 4838 4839 return false; 4840} 4841 4842void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4843 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4844 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4845 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 4846 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4847 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4848 CheckDestructorAccess(VD->getLocation(), Destructor, 4849 PDiag(diag::err_access_dtor_var) 4850 << VD->getDeclName() 4851 << VD->getType()); 4852 } 4853} 4854 4855/// AddCXXDirectInitializerToDecl - This action is called immediately after 4856/// ActOnDeclarator, when a C++ direct initializer is present. 4857/// e.g: "int x(1);" 4858void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4859 SourceLocation LParenLoc, 4860 MultiExprArg Exprs, 4861 SourceLocation *CommaLocs, 4862 SourceLocation RParenLoc) { 4863 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4864 Decl *RealDecl = Dcl.getAs<Decl>(); 4865 4866 // If there is no declaration, there was an error parsing it. Just ignore 4867 // the initializer. 4868 if (RealDecl == 0) 4869 return; 4870 4871 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4872 if (!VDecl) { 4873 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4874 RealDecl->setInvalidDecl(); 4875 return; 4876 } 4877 4878 // We will represent direct-initialization similarly to copy-initialization: 4879 // int x(1); -as-> int x = 1; 4880 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4881 // 4882 // Clients that want to distinguish between the two forms, can check for 4883 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4884 // A major benefit is that clients that don't particularly care about which 4885 // exactly form was it (like the CodeGen) can handle both cases without 4886 // special case code. 4887 4888 // C++ 8.5p11: 4889 // The form of initialization (using parentheses or '=') is generally 4890 // insignificant, but does matter when the entity being initialized has a 4891 // class type. 4892 QualType DeclInitType = VDecl->getType(); 4893 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4894 DeclInitType = Context.getBaseElementType(Array); 4895 4896 if (!VDecl->getType()->isDependentType() && 4897 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4898 diag::err_typecheck_decl_incomplete_type)) { 4899 VDecl->setInvalidDecl(); 4900 return; 4901 } 4902 4903 // The variable can not have an abstract class type. 4904 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4905 diag::err_abstract_type_in_decl, 4906 AbstractVariableType)) 4907 VDecl->setInvalidDecl(); 4908 4909 const VarDecl *Def; 4910 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4911 Diag(VDecl->getLocation(), diag::err_redefinition) 4912 << VDecl->getDeclName(); 4913 Diag(Def->getLocation(), diag::note_previous_definition); 4914 VDecl->setInvalidDecl(); 4915 return; 4916 } 4917 4918 // If either the declaration has a dependent type or if any of the 4919 // expressions is type-dependent, we represent the initialization 4920 // via a ParenListExpr for later use during template instantiation. 4921 if (VDecl->getType()->isDependentType() || 4922 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4923 // Let clients know that initialization was done with a direct initializer. 4924 VDecl->setCXXDirectInitializer(true); 4925 4926 // Store the initialization expressions as a ParenListExpr. 4927 unsigned NumExprs = Exprs.size(); 4928 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4929 (Expr **)Exprs.release(), 4930 NumExprs, RParenLoc)); 4931 return; 4932 } 4933 4934 // Capture the variable that is being initialized and the style of 4935 // initialization. 4936 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4937 4938 // FIXME: Poor source location information. 4939 InitializationKind Kind 4940 = InitializationKind::CreateDirect(VDecl->getLocation(), 4941 LParenLoc, RParenLoc); 4942 4943 InitializationSequence InitSeq(*this, Entity, Kind, 4944 (Expr**)Exprs.get(), Exprs.size()); 4945 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4946 if (Result.isInvalid()) { 4947 VDecl->setInvalidDecl(); 4948 return; 4949 } 4950 4951 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4952 VDecl->setInit(Result.takeAs<Expr>()); 4953 VDecl->setCXXDirectInitializer(true); 4954 4955 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4956 FinalizeVarWithDestructor(VDecl, Record); 4957} 4958 4959/// \brief Given a constructor and the set of arguments provided for the 4960/// constructor, convert the arguments and add any required default arguments 4961/// to form a proper call to this constructor. 4962/// 4963/// \returns true if an error occurred, false otherwise. 4964bool 4965Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4966 MultiExprArg ArgsPtr, 4967 SourceLocation Loc, 4968 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4969 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4970 unsigned NumArgs = ArgsPtr.size(); 4971 Expr **Args = (Expr **)ArgsPtr.get(); 4972 4973 const FunctionProtoType *Proto 4974 = Constructor->getType()->getAs<FunctionProtoType>(); 4975 assert(Proto && "Constructor without a prototype?"); 4976 unsigned NumArgsInProto = Proto->getNumArgs(); 4977 4978 // If too few arguments are available, we'll fill in the rest with defaults. 4979 if (NumArgs < NumArgsInProto) 4980 ConvertedArgs.reserve(NumArgsInProto); 4981 else 4982 ConvertedArgs.reserve(NumArgs); 4983 4984 VariadicCallType CallType = 4985 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4986 llvm::SmallVector<Expr *, 8> AllArgs; 4987 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4988 Proto, 0, Args, NumArgs, AllArgs, 4989 CallType); 4990 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4991 ConvertedArgs.push_back(AllArgs[i]); 4992 return Invalid; 4993} 4994 4995static inline bool 4996CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4997 const FunctionDecl *FnDecl) { 4998 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4999 if (isa<NamespaceDecl>(DC)) { 5000 return SemaRef.Diag(FnDecl->getLocation(), 5001 diag::err_operator_new_delete_declared_in_namespace) 5002 << FnDecl->getDeclName(); 5003 } 5004 5005 if (isa<TranslationUnitDecl>(DC) && 5006 FnDecl->getStorageClass() == FunctionDecl::Static) { 5007 return SemaRef.Diag(FnDecl->getLocation(), 5008 diag::err_operator_new_delete_declared_static) 5009 << FnDecl->getDeclName(); 5010 } 5011 5012 return false; 5013} 5014 5015static inline bool 5016CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5017 CanQualType ExpectedResultType, 5018 CanQualType ExpectedFirstParamType, 5019 unsigned DependentParamTypeDiag, 5020 unsigned InvalidParamTypeDiag) { 5021 QualType ResultType = 5022 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5023 5024 // Check that the result type is not dependent. 5025 if (ResultType->isDependentType()) 5026 return SemaRef.Diag(FnDecl->getLocation(), 5027 diag::err_operator_new_delete_dependent_result_type) 5028 << FnDecl->getDeclName() << ExpectedResultType; 5029 5030 // Check that the result type is what we expect. 5031 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5032 return SemaRef.Diag(FnDecl->getLocation(), 5033 diag::err_operator_new_delete_invalid_result_type) 5034 << FnDecl->getDeclName() << ExpectedResultType; 5035 5036 // A function template must have at least 2 parameters. 5037 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5038 return SemaRef.Diag(FnDecl->getLocation(), 5039 diag::err_operator_new_delete_template_too_few_parameters) 5040 << FnDecl->getDeclName(); 5041 5042 // The function decl must have at least 1 parameter. 5043 if (FnDecl->getNumParams() == 0) 5044 return SemaRef.Diag(FnDecl->getLocation(), 5045 diag::err_operator_new_delete_too_few_parameters) 5046 << FnDecl->getDeclName(); 5047 5048 // Check the the first parameter type is not dependent. 5049 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5050 if (FirstParamType->isDependentType()) 5051 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5052 << FnDecl->getDeclName() << ExpectedFirstParamType; 5053 5054 // Check that the first parameter type is what we expect. 5055 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5056 ExpectedFirstParamType) 5057 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5058 << FnDecl->getDeclName() << ExpectedFirstParamType; 5059 5060 return false; 5061} 5062 5063static bool 5064CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5065 // C++ [basic.stc.dynamic.allocation]p1: 5066 // A program is ill-formed if an allocation function is declared in a 5067 // namespace scope other than global scope or declared static in global 5068 // scope. 5069 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5070 return true; 5071 5072 CanQualType SizeTy = 5073 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5074 5075 // C++ [basic.stc.dynamic.allocation]p1: 5076 // The return type shall be void*. The first parameter shall have type 5077 // std::size_t. 5078 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5079 SizeTy, 5080 diag::err_operator_new_dependent_param_type, 5081 diag::err_operator_new_param_type)) 5082 return true; 5083 5084 // C++ [basic.stc.dynamic.allocation]p1: 5085 // The first parameter shall not have an associated default argument. 5086 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5087 return SemaRef.Diag(FnDecl->getLocation(), 5088 diag::err_operator_new_default_arg) 5089 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5090 5091 return false; 5092} 5093 5094static bool 5095CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5096 // C++ [basic.stc.dynamic.deallocation]p1: 5097 // A program is ill-formed if deallocation functions are declared in a 5098 // namespace scope other than global scope or declared static in global 5099 // scope. 5100 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5101 return true; 5102 5103 // C++ [basic.stc.dynamic.deallocation]p2: 5104 // Each deallocation function shall return void and its first parameter 5105 // shall be void*. 5106 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5107 SemaRef.Context.VoidPtrTy, 5108 diag::err_operator_delete_dependent_param_type, 5109 diag::err_operator_delete_param_type)) 5110 return true; 5111 5112 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5113 if (FirstParamType->isDependentType()) 5114 return SemaRef.Diag(FnDecl->getLocation(), 5115 diag::err_operator_delete_dependent_param_type) 5116 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5117 5118 if (SemaRef.Context.getCanonicalType(FirstParamType) != 5119 SemaRef.Context.VoidPtrTy) 5120 return SemaRef.Diag(FnDecl->getLocation(), 5121 diag::err_operator_delete_param_type) 5122 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5123 5124 return false; 5125} 5126 5127/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5128/// of this overloaded operator is well-formed. If so, returns false; 5129/// otherwise, emits appropriate diagnostics and returns true. 5130bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5131 assert(FnDecl && FnDecl->isOverloadedOperator() && 5132 "Expected an overloaded operator declaration"); 5133 5134 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5135 5136 // C++ [over.oper]p5: 5137 // The allocation and deallocation functions, operator new, 5138 // operator new[], operator delete and operator delete[], are 5139 // described completely in 3.7.3. The attributes and restrictions 5140 // found in the rest of this subclause do not apply to them unless 5141 // explicitly stated in 3.7.3. 5142 if (Op == OO_Delete || Op == OO_Array_Delete) 5143 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5144 5145 if (Op == OO_New || Op == OO_Array_New) 5146 return CheckOperatorNewDeclaration(*this, FnDecl); 5147 5148 // C++ [over.oper]p6: 5149 // An operator function shall either be a non-static member 5150 // function or be a non-member function and have at least one 5151 // parameter whose type is a class, a reference to a class, an 5152 // enumeration, or a reference to an enumeration. 5153 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5154 if (MethodDecl->isStatic()) 5155 return Diag(FnDecl->getLocation(), 5156 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5157 } else { 5158 bool ClassOrEnumParam = false; 5159 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5160 ParamEnd = FnDecl->param_end(); 5161 Param != ParamEnd; ++Param) { 5162 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5163 if (ParamType->isDependentType() || ParamType->isRecordType() || 5164 ParamType->isEnumeralType()) { 5165 ClassOrEnumParam = true; 5166 break; 5167 } 5168 } 5169 5170 if (!ClassOrEnumParam) 5171 return Diag(FnDecl->getLocation(), 5172 diag::err_operator_overload_needs_class_or_enum) 5173 << FnDecl->getDeclName(); 5174 } 5175 5176 // C++ [over.oper]p8: 5177 // An operator function cannot have default arguments (8.3.6), 5178 // except where explicitly stated below. 5179 // 5180 // Only the function-call operator allows default arguments 5181 // (C++ [over.call]p1). 5182 if (Op != OO_Call) { 5183 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5184 Param != FnDecl->param_end(); ++Param) { 5185 if ((*Param)->hasDefaultArg()) 5186 return Diag((*Param)->getLocation(), 5187 diag::err_operator_overload_default_arg) 5188 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5189 } 5190 } 5191 5192 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5193 { false, false, false } 5194#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5195 , { Unary, Binary, MemberOnly } 5196#include "clang/Basic/OperatorKinds.def" 5197 }; 5198 5199 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5200 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5201 bool MustBeMemberOperator = OperatorUses[Op][2]; 5202 5203 // C++ [over.oper]p8: 5204 // [...] Operator functions cannot have more or fewer parameters 5205 // than the number required for the corresponding operator, as 5206 // described in the rest of this subclause. 5207 unsigned NumParams = FnDecl->getNumParams() 5208 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5209 if (Op != OO_Call && 5210 ((NumParams == 1 && !CanBeUnaryOperator) || 5211 (NumParams == 2 && !CanBeBinaryOperator) || 5212 (NumParams < 1) || (NumParams > 2))) { 5213 // We have the wrong number of parameters. 5214 unsigned ErrorKind; 5215 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5216 ErrorKind = 2; // 2 -> unary or binary. 5217 } else if (CanBeUnaryOperator) { 5218 ErrorKind = 0; // 0 -> unary 5219 } else { 5220 assert(CanBeBinaryOperator && 5221 "All non-call overloaded operators are unary or binary!"); 5222 ErrorKind = 1; // 1 -> binary 5223 } 5224 5225 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5226 << FnDecl->getDeclName() << NumParams << ErrorKind; 5227 } 5228 5229 // Overloaded operators other than operator() cannot be variadic. 5230 if (Op != OO_Call && 5231 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5232 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5233 << FnDecl->getDeclName(); 5234 } 5235 5236 // Some operators must be non-static member functions. 5237 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5238 return Diag(FnDecl->getLocation(), 5239 diag::err_operator_overload_must_be_member) 5240 << FnDecl->getDeclName(); 5241 } 5242 5243 // C++ [over.inc]p1: 5244 // The user-defined function called operator++ implements the 5245 // prefix and postfix ++ operator. If this function is a member 5246 // function with no parameters, or a non-member function with one 5247 // parameter of class or enumeration type, it defines the prefix 5248 // increment operator ++ for objects of that type. If the function 5249 // is a member function with one parameter (which shall be of type 5250 // int) or a non-member function with two parameters (the second 5251 // of which shall be of type int), it defines the postfix 5252 // increment operator ++ for objects of that type. 5253 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5254 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5255 bool ParamIsInt = false; 5256 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5257 ParamIsInt = BT->getKind() == BuiltinType::Int; 5258 5259 if (!ParamIsInt) 5260 return Diag(LastParam->getLocation(), 5261 diag::err_operator_overload_post_incdec_must_be_int) 5262 << LastParam->getType() << (Op == OO_MinusMinus); 5263 } 5264 5265 // Notify the class if it got an assignment operator. 5266 if (Op == OO_Equal) { 5267 // Would have returned earlier otherwise. 5268 assert(isa<CXXMethodDecl>(FnDecl) && 5269 "Overloaded = not member, but not filtered."); 5270 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5271 Method->getParent()->addedAssignmentOperator(Context, Method); 5272 } 5273 5274 return false; 5275} 5276 5277/// CheckLiteralOperatorDeclaration - Check whether the declaration 5278/// of this literal operator function is well-formed. If so, returns 5279/// false; otherwise, emits appropriate diagnostics and returns true. 5280bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5281 DeclContext *DC = FnDecl->getDeclContext(); 5282 Decl::Kind Kind = DC->getDeclKind(); 5283 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5284 Kind != Decl::LinkageSpec) { 5285 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5286 << FnDecl->getDeclName(); 5287 return true; 5288 } 5289 5290 bool Valid = false; 5291 5292 // template <char...> type operator "" name() is the only valid template 5293 // signature, and the only valid signature with no parameters. 5294 if (FnDecl->param_size() == 0) { 5295 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5296 // Must have only one template parameter 5297 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5298 if (Params->size() == 1) { 5299 NonTypeTemplateParmDecl *PmDecl = 5300 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5301 5302 // The template parameter must be a char parameter pack. 5303 // FIXME: This test will always fail because non-type parameter packs 5304 // have not been implemented. 5305 if (PmDecl && PmDecl->isTemplateParameterPack() && 5306 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5307 Valid = true; 5308 } 5309 } 5310 } else { 5311 // Check the first parameter 5312 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5313 5314 QualType T = (*Param)->getType(); 5315 5316 // unsigned long long int, long double, and any character type are allowed 5317 // as the only parameters. 5318 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5319 Context.hasSameType(T, Context.LongDoubleTy) || 5320 Context.hasSameType(T, Context.CharTy) || 5321 Context.hasSameType(T, Context.WCharTy) || 5322 Context.hasSameType(T, Context.Char16Ty) || 5323 Context.hasSameType(T, Context.Char32Ty)) { 5324 if (++Param == FnDecl->param_end()) 5325 Valid = true; 5326 goto FinishedParams; 5327 } 5328 5329 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5330 const PointerType *PT = T->getAs<PointerType>(); 5331 if (!PT) 5332 goto FinishedParams; 5333 T = PT->getPointeeType(); 5334 if (!T.isConstQualified()) 5335 goto FinishedParams; 5336 T = T.getUnqualifiedType(); 5337 5338 // Move on to the second parameter; 5339 ++Param; 5340 5341 // If there is no second parameter, the first must be a const char * 5342 if (Param == FnDecl->param_end()) { 5343 if (Context.hasSameType(T, Context.CharTy)) 5344 Valid = true; 5345 goto FinishedParams; 5346 } 5347 5348 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5349 // are allowed as the first parameter to a two-parameter function 5350 if (!(Context.hasSameType(T, Context.CharTy) || 5351 Context.hasSameType(T, Context.WCharTy) || 5352 Context.hasSameType(T, Context.Char16Ty) || 5353 Context.hasSameType(T, Context.Char32Ty))) 5354 goto FinishedParams; 5355 5356 // The second and final parameter must be an std::size_t 5357 T = (*Param)->getType().getUnqualifiedType(); 5358 if (Context.hasSameType(T, Context.getSizeType()) && 5359 ++Param == FnDecl->param_end()) 5360 Valid = true; 5361 } 5362 5363 // FIXME: This diagnostic is absolutely terrible. 5364FinishedParams: 5365 if (!Valid) { 5366 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5367 << FnDecl->getDeclName(); 5368 return true; 5369 } 5370 5371 return false; 5372} 5373 5374/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5375/// linkage specification, including the language and (if present) 5376/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5377/// the location of the language string literal, which is provided 5378/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5379/// the '{' brace. Otherwise, this linkage specification does not 5380/// have any braces. 5381Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5382 SourceLocation ExternLoc, 5383 SourceLocation LangLoc, 5384 llvm::StringRef Lang, 5385 SourceLocation LBraceLoc) { 5386 LinkageSpecDecl::LanguageIDs Language; 5387 if (Lang == "\"C\"") 5388 Language = LinkageSpecDecl::lang_c; 5389 else if (Lang == "\"C++\"") 5390 Language = LinkageSpecDecl::lang_cxx; 5391 else { 5392 Diag(LangLoc, diag::err_bad_language); 5393 return DeclPtrTy(); 5394 } 5395 5396 // FIXME: Add all the various semantics of linkage specifications 5397 5398 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5399 LangLoc, Language, 5400 LBraceLoc.isValid()); 5401 CurContext->addDecl(D); 5402 PushDeclContext(S, D); 5403 return DeclPtrTy::make(D); 5404} 5405 5406/// ActOnFinishLinkageSpecification - Completely the definition of 5407/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5408/// valid, it's the position of the closing '}' brace in a linkage 5409/// specification that uses braces. 5410Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5411 DeclPtrTy LinkageSpec, 5412 SourceLocation RBraceLoc) { 5413 if (LinkageSpec) 5414 PopDeclContext(); 5415 return LinkageSpec; 5416} 5417 5418/// \brief Perform semantic analysis for the variable declaration that 5419/// occurs within a C++ catch clause, returning the newly-created 5420/// variable. 5421VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5422 TypeSourceInfo *TInfo, 5423 IdentifierInfo *Name, 5424 SourceLocation Loc, 5425 SourceRange Range) { 5426 bool Invalid = false; 5427 5428 // Arrays and functions decay. 5429 if (ExDeclType->isArrayType()) 5430 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5431 else if (ExDeclType->isFunctionType()) 5432 ExDeclType = Context.getPointerType(ExDeclType); 5433 5434 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5435 // The exception-declaration shall not denote a pointer or reference to an 5436 // incomplete type, other than [cv] void*. 5437 // N2844 forbids rvalue references. 5438 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5439 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5440 Invalid = true; 5441 } 5442 5443 // GCC allows catching pointers and references to incomplete types 5444 // as an extension; so do we, but we warn by default. 5445 5446 QualType BaseType = ExDeclType; 5447 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5448 unsigned DK = diag::err_catch_incomplete; 5449 bool IncompleteCatchIsInvalid = true; 5450 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5451 BaseType = Ptr->getPointeeType(); 5452 Mode = 1; 5453 DK = diag::ext_catch_incomplete_ptr; 5454 IncompleteCatchIsInvalid = false; 5455 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5456 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5457 BaseType = Ref->getPointeeType(); 5458 Mode = 2; 5459 DK = diag::ext_catch_incomplete_ref; 5460 IncompleteCatchIsInvalid = false; 5461 } 5462 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5463 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5464 IncompleteCatchIsInvalid) 5465 Invalid = true; 5466 5467 if (!Invalid && !ExDeclType->isDependentType() && 5468 RequireNonAbstractType(Loc, ExDeclType, 5469 diag::err_abstract_type_in_decl, 5470 AbstractVariableType)) 5471 Invalid = true; 5472 5473 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5474 Name, ExDeclType, TInfo, VarDecl::None, 5475 VarDecl::None); 5476 ExDecl->setExceptionVariable(true); 5477 5478 if (!Invalid) { 5479 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5480 // C++ [except.handle]p16: 5481 // The object declared in an exception-declaration or, if the 5482 // exception-declaration does not specify a name, a temporary (12.2) is 5483 // copy-initialized (8.5) from the exception object. [...] 5484 // The object is destroyed when the handler exits, after the destruction 5485 // of any automatic objects initialized within the handler. 5486 // 5487 // We just pretend to initialize the object with itself, then make sure 5488 // it can be destroyed later. 5489 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5490 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5491 Loc, ExDeclType, 0); 5492 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5493 SourceLocation()); 5494 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5495 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5496 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5497 if (Result.isInvalid()) 5498 Invalid = true; 5499 else 5500 FinalizeVarWithDestructor(ExDecl, RecordTy); 5501 } 5502 } 5503 5504 if (Invalid) 5505 ExDecl->setInvalidDecl(); 5506 5507 return ExDecl; 5508} 5509 5510/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5511/// handler. 5512Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5513 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 5514 QualType ExDeclType = TInfo->getType(); 5515 5516 bool Invalid = D.isInvalidType(); 5517 IdentifierInfo *II = D.getIdentifier(); 5518 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 5519 LookupOrdinaryName, 5520 ForRedeclaration)) { 5521 // The scope should be freshly made just for us. There is just no way 5522 // it contains any previous declaration. 5523 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5524 if (PrevDecl->isTemplateParameter()) { 5525 // Maybe we will complain about the shadowed template parameter. 5526 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5527 } 5528 } 5529 5530 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5531 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5532 << D.getCXXScopeSpec().getRange(); 5533 Invalid = true; 5534 } 5535 5536 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5537 D.getIdentifier(), 5538 D.getIdentifierLoc(), 5539 D.getDeclSpec().getSourceRange()); 5540 5541 if (Invalid) 5542 ExDecl->setInvalidDecl(); 5543 5544 // Add the exception declaration into this scope. 5545 if (II) 5546 PushOnScopeChains(ExDecl, S); 5547 else 5548 CurContext->addDecl(ExDecl); 5549 5550 ProcessDeclAttributes(S, ExDecl, D); 5551 return DeclPtrTy::make(ExDecl); 5552} 5553 5554Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5555 ExprArg assertexpr, 5556 ExprArg assertmessageexpr) { 5557 Expr *AssertExpr = (Expr *)assertexpr.get(); 5558 StringLiteral *AssertMessage = 5559 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5560 5561 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5562 llvm::APSInt Value(32); 5563 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5564 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5565 AssertExpr->getSourceRange(); 5566 return DeclPtrTy(); 5567 } 5568 5569 if (Value == 0) { 5570 Diag(AssertLoc, diag::err_static_assert_failed) 5571 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5572 } 5573 } 5574 5575 assertexpr.release(); 5576 assertmessageexpr.release(); 5577 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5578 AssertExpr, AssertMessage); 5579 5580 CurContext->addDecl(Decl); 5581 return DeclPtrTy::make(Decl); 5582} 5583 5584/// \brief Perform semantic analysis of the given friend type declaration. 5585/// 5586/// \returns A friend declaration that. 5587FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 5588 TypeSourceInfo *TSInfo) { 5589 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 5590 5591 QualType T = TSInfo->getType(); 5592 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 5593 5594 if (!getLangOptions().CPlusPlus0x) { 5595 // C++03 [class.friend]p2: 5596 // An elaborated-type-specifier shall be used in a friend declaration 5597 // for a class.* 5598 // 5599 // * The class-key of the elaborated-type-specifier is required. 5600 if (!ActiveTemplateInstantiations.empty()) { 5601 // Do not complain about the form of friend template types during 5602 // template instantiation; we will already have complained when the 5603 // template was declared. 5604 } else if (!T->isElaboratedTypeSpecifier()) { 5605 // If we evaluated the type to a record type, suggest putting 5606 // a tag in front. 5607 if (const RecordType *RT = T->getAs<RecordType>()) { 5608 RecordDecl *RD = RT->getDecl(); 5609 5610 std::string InsertionText = std::string(" ") + RD->getKindName(); 5611 5612 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 5613 << (unsigned) RD->getTagKind() 5614 << T 5615 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 5616 InsertionText); 5617 } else { 5618 Diag(FriendLoc, diag::ext_nonclass_type_friend) 5619 << T 5620 << SourceRange(FriendLoc, TypeRange.getEnd()); 5621 } 5622 } else if (T->getAs<EnumType>()) { 5623 Diag(FriendLoc, diag::ext_enum_friend) 5624 << T 5625 << SourceRange(FriendLoc, TypeRange.getEnd()); 5626 } 5627 } 5628 5629 // C++0x [class.friend]p3: 5630 // If the type specifier in a friend declaration designates a (possibly 5631 // cv-qualified) class type, that class is declared as a friend; otherwise, 5632 // the friend declaration is ignored. 5633 5634 // FIXME: C++0x has some syntactic restrictions on friend type declarations 5635 // in [class.friend]p3 that we do not implement. 5636 5637 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 5638} 5639 5640/// Handle a friend type declaration. This works in tandem with 5641/// ActOnTag. 5642/// 5643/// Notes on friend class templates: 5644/// 5645/// We generally treat friend class declarations as if they were 5646/// declaring a class. So, for example, the elaborated type specifier 5647/// in a friend declaration is required to obey the restrictions of a 5648/// class-head (i.e. no typedefs in the scope chain), template 5649/// parameters are required to match up with simple template-ids, &c. 5650/// However, unlike when declaring a template specialization, it's 5651/// okay to refer to a template specialization without an empty 5652/// template parameter declaration, e.g. 5653/// friend class A<T>::B<unsigned>; 5654/// We permit this as a special case; if there are any template 5655/// parameters present at all, require proper matching, i.e. 5656/// template <> template <class T> friend class A<int>::B; 5657Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5658 MultiTemplateParamsArg TempParams) { 5659 SourceLocation Loc = DS.getSourceRange().getBegin(); 5660 5661 assert(DS.isFriendSpecified()); 5662 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5663 5664 // Try to convert the decl specifier to a type. This works for 5665 // friend templates because ActOnTag never produces a ClassTemplateDecl 5666 // for a TUK_Friend. 5667 Declarator TheDeclarator(DS, Declarator::MemberContext); 5668 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 5669 QualType T = TSI->getType(); 5670 if (TheDeclarator.isInvalidType()) 5671 return DeclPtrTy(); 5672 5673 // This is definitely an error in C++98. It's probably meant to 5674 // be forbidden in C++0x, too, but the specification is just 5675 // poorly written. 5676 // 5677 // The problem is with declarations like the following: 5678 // template <T> friend A<T>::foo; 5679 // where deciding whether a class C is a friend or not now hinges 5680 // on whether there exists an instantiation of A that causes 5681 // 'foo' to equal C. There are restrictions on class-heads 5682 // (which we declare (by fiat) elaborated friend declarations to 5683 // be) that makes this tractable. 5684 // 5685 // FIXME: handle "template <> friend class A<T>;", which 5686 // is possibly well-formed? Who even knows? 5687 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5688 Diag(Loc, diag::err_tagless_friend_type_template) 5689 << DS.getSourceRange(); 5690 return DeclPtrTy(); 5691 } 5692 5693 // C++98 [class.friend]p1: A friend of a class is a function 5694 // or class that is not a member of the class . . . 5695 // This is fixed in DR77, which just barely didn't make the C++03 5696 // deadline. It's also a very silly restriction that seriously 5697 // affects inner classes and which nobody else seems to implement; 5698 // thus we never diagnose it, not even in -pedantic. 5699 // 5700 // But note that we could warn about it: it's always useless to 5701 // friend one of your own members (it's not, however, worthless to 5702 // friend a member of an arbitrary specialization of your template). 5703 5704 Decl *D; 5705 if (unsigned NumTempParamLists = TempParams.size()) 5706 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5707 NumTempParamLists, 5708 (TemplateParameterList**) TempParams.release(), 5709 TSI, 5710 DS.getFriendSpecLoc()); 5711 else 5712 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5713 5714 if (!D) 5715 return DeclPtrTy(); 5716 5717 D->setAccess(AS_public); 5718 CurContext->addDecl(D); 5719 5720 return DeclPtrTy::make(D); 5721} 5722 5723Sema::DeclPtrTy 5724Sema::ActOnFriendFunctionDecl(Scope *S, 5725 Declarator &D, 5726 bool IsDefinition, 5727 MultiTemplateParamsArg TemplateParams) { 5728 const DeclSpec &DS = D.getDeclSpec(); 5729 5730 assert(DS.isFriendSpecified()); 5731 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5732 5733 SourceLocation Loc = D.getIdentifierLoc(); 5734 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 5735 QualType T = TInfo->getType(); 5736 5737 // C++ [class.friend]p1 5738 // A friend of a class is a function or class.... 5739 // Note that this sees through typedefs, which is intended. 5740 // It *doesn't* see through dependent types, which is correct 5741 // according to [temp.arg.type]p3: 5742 // If a declaration acquires a function type through a 5743 // type dependent on a template-parameter and this causes 5744 // a declaration that does not use the syntactic form of a 5745 // function declarator to have a function type, the program 5746 // is ill-formed. 5747 if (!T->isFunctionType()) { 5748 Diag(Loc, diag::err_unexpected_friend); 5749 5750 // It might be worthwhile to try to recover by creating an 5751 // appropriate declaration. 5752 return DeclPtrTy(); 5753 } 5754 5755 // C++ [namespace.memdef]p3 5756 // - If a friend declaration in a non-local class first declares a 5757 // class or function, the friend class or function is a member 5758 // of the innermost enclosing namespace. 5759 // - The name of the friend is not found by simple name lookup 5760 // until a matching declaration is provided in that namespace 5761 // scope (either before or after the class declaration granting 5762 // friendship). 5763 // - If a friend function is called, its name may be found by the 5764 // name lookup that considers functions from namespaces and 5765 // classes associated with the types of the function arguments. 5766 // - When looking for a prior declaration of a class or a function 5767 // declared as a friend, scopes outside the innermost enclosing 5768 // namespace scope are not considered. 5769 5770 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5771 DeclarationName Name = GetNameForDeclarator(D); 5772 assert(Name); 5773 5774 // The context we found the declaration in, or in which we should 5775 // create the declaration. 5776 DeclContext *DC; 5777 5778 // FIXME: handle local classes 5779 5780 // Recover from invalid scope qualifiers as if they just weren't there. 5781 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5782 ForRedeclaration); 5783 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5784 DC = computeDeclContext(ScopeQual); 5785 5786 // FIXME: handle dependent contexts 5787 if (!DC) return DeclPtrTy(); 5788 if (RequireCompleteDeclContext(ScopeQual, DC)) return DeclPtrTy(); 5789 5790 LookupQualifiedName(Previous, DC); 5791 5792 // Ignore things found implicitly in the wrong scope. 5793 // TODO: better diagnostics for this case. Suggesting the right 5794 // qualified scope would be nice... 5795 LookupResult::Filter F = Previous.makeFilter(); 5796 while (F.hasNext()) { 5797 NamedDecl *D = F.next(); 5798 if (!D->getDeclContext()->getLookupContext()->Equals(DC)) 5799 F.erase(); 5800 } 5801 F.done(); 5802 5803 if (Previous.empty()) { 5804 D.setInvalidType(); 5805 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5806 return DeclPtrTy(); 5807 } 5808 5809 // C++ [class.friend]p1: A friend of a class is a function or 5810 // class that is not a member of the class . . . 5811 if (DC->Equals(CurContext)) 5812 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5813 5814 // Otherwise walk out to the nearest namespace scope looking for matches. 5815 } else { 5816 // TODO: handle local class contexts. 5817 5818 DC = CurContext; 5819 while (true) { 5820 // Skip class contexts. If someone can cite chapter and verse 5821 // for this behavior, that would be nice --- it's what GCC and 5822 // EDG do, and it seems like a reasonable intent, but the spec 5823 // really only says that checks for unqualified existing 5824 // declarations should stop at the nearest enclosing namespace, 5825 // not that they should only consider the nearest enclosing 5826 // namespace. 5827 while (DC->isRecord()) 5828 DC = DC->getParent(); 5829 5830 LookupQualifiedName(Previous, DC); 5831 5832 // TODO: decide what we think about using declarations. 5833 if (!Previous.empty()) 5834 break; 5835 5836 if (DC->isFileContext()) break; 5837 DC = DC->getParent(); 5838 } 5839 5840 // C++ [class.friend]p1: A friend of a class is a function or 5841 // class that is not a member of the class . . . 5842 // C++0x changes this for both friend types and functions. 5843 // Most C++ 98 compilers do seem to give an error here, so 5844 // we do, too. 5845 if (!Previous.empty() && DC->Equals(CurContext) 5846 && !getLangOptions().CPlusPlus0x) 5847 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5848 } 5849 5850 if (DC->isFileContext()) { 5851 // This implies that it has to be an operator or function. 5852 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5853 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5854 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5855 Diag(Loc, diag::err_introducing_special_friend) << 5856 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5857 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5858 return DeclPtrTy(); 5859 } 5860 } 5861 5862 bool Redeclaration = false; 5863 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5864 move(TemplateParams), 5865 IsDefinition, 5866 Redeclaration); 5867 if (!ND) return DeclPtrTy(); 5868 5869 assert(ND->getDeclContext() == DC); 5870 assert(ND->getLexicalDeclContext() == CurContext); 5871 5872 // Add the function declaration to the appropriate lookup tables, 5873 // adjusting the redeclarations list as necessary. We don't 5874 // want to do this yet if the friending class is dependent. 5875 // 5876 // Also update the scope-based lookup if the target context's 5877 // lookup context is in lexical scope. 5878 if (!CurContext->isDependentContext()) { 5879 DC = DC->getLookupContext(); 5880 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5881 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5882 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5883 } 5884 5885 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5886 D.getIdentifierLoc(), ND, 5887 DS.getFriendSpecLoc()); 5888 FrD->setAccess(AS_public); 5889 CurContext->addDecl(FrD); 5890 5891 return DeclPtrTy::make(ND); 5892} 5893 5894void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5895 AdjustDeclIfTemplate(dcl); 5896 5897 Decl *Dcl = dcl.getAs<Decl>(); 5898 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5899 if (!Fn) { 5900 Diag(DelLoc, diag::err_deleted_non_function); 5901 return; 5902 } 5903 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5904 Diag(DelLoc, diag::err_deleted_decl_not_first); 5905 Diag(Prev->getLocation(), diag::note_previous_declaration); 5906 // If the declaration wasn't the first, we delete the function anyway for 5907 // recovery. 5908 } 5909 Fn->setDeleted(); 5910} 5911 5912static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5913 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5914 ++CI) { 5915 Stmt *SubStmt = *CI; 5916 if (!SubStmt) 5917 continue; 5918 if (isa<ReturnStmt>(SubStmt)) 5919 Self.Diag(SubStmt->getSourceRange().getBegin(), 5920 diag::err_return_in_constructor_handler); 5921 if (!isa<Expr>(SubStmt)) 5922 SearchForReturnInStmt(Self, SubStmt); 5923 } 5924} 5925 5926void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5927 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5928 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5929 SearchForReturnInStmt(*this, Handler); 5930 } 5931} 5932 5933bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5934 const CXXMethodDecl *Old) { 5935 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5936 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5937 5938 if (Context.hasSameType(NewTy, OldTy) || 5939 NewTy->isDependentType() || OldTy->isDependentType()) 5940 return false; 5941 5942 // Check if the return types are covariant 5943 QualType NewClassTy, OldClassTy; 5944 5945 /// Both types must be pointers or references to classes. 5946 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5947 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5948 NewClassTy = NewPT->getPointeeType(); 5949 OldClassTy = OldPT->getPointeeType(); 5950 } 5951 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5952 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5953 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5954 NewClassTy = NewRT->getPointeeType(); 5955 OldClassTy = OldRT->getPointeeType(); 5956 } 5957 } 5958 } 5959 5960 // The return types aren't either both pointers or references to a class type. 5961 if (NewClassTy.isNull()) { 5962 Diag(New->getLocation(), 5963 diag::err_different_return_type_for_overriding_virtual_function) 5964 << New->getDeclName() << NewTy << OldTy; 5965 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5966 5967 return true; 5968 } 5969 5970 // C++ [class.virtual]p6: 5971 // If the return type of D::f differs from the return type of B::f, the 5972 // class type in the return type of D::f shall be complete at the point of 5973 // declaration of D::f or shall be the class type D. 5974 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5975 if (!RT->isBeingDefined() && 5976 RequireCompleteType(New->getLocation(), NewClassTy, 5977 PDiag(diag::err_covariant_return_incomplete) 5978 << New->getDeclName())) 5979 return true; 5980 } 5981 5982 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5983 // Check if the new class derives from the old class. 5984 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5985 Diag(New->getLocation(), 5986 diag::err_covariant_return_not_derived) 5987 << New->getDeclName() << NewTy << OldTy; 5988 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5989 return true; 5990 } 5991 5992 // Check if we the conversion from derived to base is valid. 5993 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5994 diag::err_covariant_return_inaccessible_base, 5995 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5996 // FIXME: Should this point to the return type? 5997 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 5998 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5999 return true; 6000 } 6001 } 6002 6003 // The qualifiers of the return types must be the same. 6004 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6005 Diag(New->getLocation(), 6006 diag::err_covariant_return_type_different_qualifications) 6007 << New->getDeclName() << NewTy << OldTy; 6008 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6009 return true; 6010 }; 6011 6012 6013 // The new class type must have the same or less qualifiers as the old type. 6014 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6015 Diag(New->getLocation(), 6016 diag::err_covariant_return_type_class_type_more_qualified) 6017 << New->getDeclName() << NewTy << OldTy; 6018 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6019 return true; 6020 }; 6021 6022 return false; 6023} 6024 6025bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6026 const CXXMethodDecl *Old) 6027{ 6028 if (Old->hasAttr<FinalAttr>()) { 6029 Diag(New->getLocation(), diag::err_final_function_overridden) 6030 << New->getDeclName(); 6031 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6032 return true; 6033 } 6034 6035 return false; 6036} 6037 6038/// \brief Mark the given method pure. 6039/// 6040/// \param Method the method to be marked pure. 6041/// 6042/// \param InitRange the source range that covers the "0" initializer. 6043bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6044 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6045 Method->setPure(); 6046 6047 // A class is abstract if at least one function is pure virtual. 6048 Method->getParent()->setAbstract(true); 6049 return false; 6050 } 6051 6052 if (!Method->isInvalidDecl()) 6053 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6054 << Method->getDeclName() << InitRange; 6055 return true; 6056} 6057 6058/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6059/// an initializer for the out-of-line declaration 'Dcl'. The scope 6060/// is a fresh scope pushed for just this purpose. 6061/// 6062/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6063/// static data member of class X, names should be looked up in the scope of 6064/// class X. 6065void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6066 // If there is no declaration, there was an error parsing it. 6067 Decl *D = Dcl.getAs<Decl>(); 6068 if (D == 0) return; 6069 6070 // We should only get called for declarations with scope specifiers, like: 6071 // int foo::bar; 6072 assert(D->isOutOfLine()); 6073 EnterDeclaratorContext(S, D->getDeclContext()); 6074} 6075 6076/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6077/// initializer for the out-of-line declaration 'Dcl'. 6078void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6079 // If there is no declaration, there was an error parsing it. 6080 Decl *D = Dcl.getAs<Decl>(); 6081 if (D == 0) return; 6082 6083 assert(D->isOutOfLine()); 6084 ExitDeclaratorContext(S); 6085} 6086 6087/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6088/// C++ if/switch/while/for statement. 6089/// e.g: "if (int x = f()) {...}" 6090Action::DeclResult 6091Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6092 // C++ 6.4p2: 6093 // The declarator shall not specify a function or an array. 6094 // The type-specifier-seq shall not contain typedef and shall not declare a 6095 // new class or enumeration. 6096 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6097 "Parser allowed 'typedef' as storage class of condition decl."); 6098 6099 TagDecl *OwnedTag = 0; 6100 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6101 QualType Ty = TInfo->getType(); 6102 6103 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6104 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6105 // would be created and CXXConditionDeclExpr wants a VarDecl. 6106 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6107 << D.getSourceRange(); 6108 return DeclResult(); 6109 } else if (OwnedTag && OwnedTag->isDefinition()) { 6110 // The type-specifier-seq shall not declare a new class or enumeration. 6111 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6112 } 6113 6114 DeclPtrTy Dcl = ActOnDeclarator(S, D); 6115 if (!Dcl) 6116 return DeclResult(); 6117 6118 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 6119 VD->setDeclaredInCondition(true); 6120 return Dcl; 6121} 6122 6123void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6124 bool DefinitionRequired) { 6125 // Ignore any vtable uses in unevaluated operands or for classes that do 6126 // not have a vtable. 6127 if (!Class->isDynamicClass() || Class->isDependentContext() || 6128 CurContext->isDependentContext() || 6129 ExprEvalContexts.back().Context == Unevaluated) 6130 return; 6131 6132 // Try to insert this class into the map. 6133 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6134 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6135 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6136 if (!Pos.second) { 6137 // If we already had an entry, check to see if we are promoting this vtable 6138 // to required a definition. If so, we need to reappend to the VTableUses 6139 // list, since we may have already processed the first entry. 6140 if (DefinitionRequired && !Pos.first->second) { 6141 Pos.first->second = true; 6142 } else { 6143 // Otherwise, we can early exit. 6144 return; 6145 } 6146 } 6147 6148 // Local classes need to have their virtual members marked 6149 // immediately. For all other classes, we mark their virtual members 6150 // at the end of the translation unit. 6151 if (Class->isLocalClass()) 6152 MarkVirtualMembersReferenced(Loc, Class); 6153 else 6154 VTableUses.push_back(std::make_pair(Class, Loc)); 6155} 6156 6157bool Sema::DefineUsedVTables() { 6158 // If any dynamic classes have their key function defined within 6159 // this translation unit, then those vtables are considered "used" and must 6160 // be emitted. 6161 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6162 if (const CXXMethodDecl *KeyFunction 6163 = Context.getKeyFunction(DynamicClasses[I])) { 6164 const FunctionDecl *Definition = 0; 6165 if (KeyFunction->getBody(Definition)) 6166 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6167 } 6168 } 6169 6170 if (VTableUses.empty()) 6171 return false; 6172 6173 // Note: The VTableUses vector could grow as a result of marking 6174 // the members of a class as "used", so we check the size each 6175 // time through the loop and prefer indices (with are stable) to 6176 // iterators (which are not). 6177 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6178 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6179 if (!Class) 6180 continue; 6181 6182 SourceLocation Loc = VTableUses[I].second; 6183 6184 // If this class has a key function, but that key function is 6185 // defined in another translation unit, we don't need to emit the 6186 // vtable even though we're using it. 6187 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6188 if (KeyFunction && !KeyFunction->getBody()) { 6189 switch (KeyFunction->getTemplateSpecializationKind()) { 6190 case TSK_Undeclared: 6191 case TSK_ExplicitSpecialization: 6192 case TSK_ExplicitInstantiationDeclaration: 6193 // The key function is in another translation unit. 6194 continue; 6195 6196 case TSK_ExplicitInstantiationDefinition: 6197 case TSK_ImplicitInstantiation: 6198 // We will be instantiating the key function. 6199 break; 6200 } 6201 } else if (!KeyFunction) { 6202 // If we have a class with no key function that is the subject 6203 // of an explicit instantiation declaration, suppress the 6204 // vtable; it will live with the explicit instantiation 6205 // definition. 6206 bool IsExplicitInstantiationDeclaration 6207 = Class->getTemplateSpecializationKind() 6208 == TSK_ExplicitInstantiationDeclaration; 6209 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6210 REnd = Class->redecls_end(); 6211 R != REnd; ++R) { 6212 TemplateSpecializationKind TSK 6213 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6214 if (TSK == TSK_ExplicitInstantiationDeclaration) 6215 IsExplicitInstantiationDeclaration = true; 6216 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6217 IsExplicitInstantiationDeclaration = false; 6218 break; 6219 } 6220 } 6221 6222 if (IsExplicitInstantiationDeclaration) 6223 continue; 6224 } 6225 6226 // Mark all of the virtual members of this class as referenced, so 6227 // that we can build a vtable. Then, tell the AST consumer that a 6228 // vtable for this class is required. 6229 MarkVirtualMembersReferenced(Loc, Class); 6230 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6231 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6232 6233 // Optionally warn if we're emitting a weak vtable. 6234 if (Class->getLinkage() == ExternalLinkage && 6235 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6236 if (!KeyFunction || (KeyFunction->getBody() && KeyFunction->isInlined())) 6237 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6238 } 6239 } 6240 VTableUses.clear(); 6241 6242 return true; 6243} 6244 6245void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6246 const CXXRecordDecl *RD) { 6247 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6248 e = RD->method_end(); i != e; ++i) { 6249 CXXMethodDecl *MD = *i; 6250 6251 // C++ [basic.def.odr]p2: 6252 // [...] A virtual member function is used if it is not pure. [...] 6253 if (MD->isVirtual() && !MD->isPure()) 6254 MarkDeclarationReferenced(Loc, MD); 6255 } 6256 6257 // Only classes that have virtual bases need a VTT. 6258 if (RD->getNumVBases() == 0) 6259 return; 6260 6261 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6262 e = RD->bases_end(); i != e; ++i) { 6263 const CXXRecordDecl *Base = 6264 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6265 if (i->isVirtual()) 6266 continue; 6267 if (Base->getNumVBases() == 0) 6268 continue; 6269 MarkVirtualMembersReferenced(Loc, Base); 6270 } 6271} 6272 6273/// SetIvarInitializers - This routine builds initialization ASTs for the 6274/// Objective-C implementation whose ivars need be initialized. 6275void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6276 if (!getLangOptions().CPlusPlus) 6277 return; 6278 if (const ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6279 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6280 CollectIvarsToConstructOrDestruct(OID, ivars); 6281 if (ivars.empty()) 6282 return; 6283 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6284 for (unsigned i = 0; i < ivars.size(); i++) { 6285 FieldDecl *Field = ivars[i]; 6286 if (Field->isInvalidDecl()) 6287 continue; 6288 6289 CXXBaseOrMemberInitializer *Member; 6290 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6291 InitializationKind InitKind = 6292 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6293 6294 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6295 Sema::OwningExprResult MemberInit = 6296 InitSeq.Perform(*this, InitEntity, InitKind, 6297 Sema::MultiExprArg(*this, 0, 0)); 6298 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 6299 // Note, MemberInit could actually come back empty if no initialization 6300 // is required (e.g., because it would call a trivial default constructor) 6301 if (!MemberInit.get() || MemberInit.isInvalid()) 6302 continue; 6303 6304 Member = 6305 new (Context) CXXBaseOrMemberInitializer(Context, 6306 Field, SourceLocation(), 6307 SourceLocation(), 6308 MemberInit.takeAs<Expr>(), 6309 SourceLocation()); 6310 AllToInit.push_back(Member); 6311 6312 // Be sure that the destructor is accessible and is marked as referenced. 6313 if (const RecordType *RecordTy 6314 = Context.getBaseElementType(Field->getType()) 6315 ->getAs<RecordType>()) { 6316 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6317 if (CXXDestructorDecl *Destructor 6318 = const_cast<CXXDestructorDecl*>(RD->getDestructor(Context))) { 6319 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6320 CheckDestructorAccess(Field->getLocation(), Destructor, 6321 PDiag(diag::err_access_dtor_ivar) 6322 << Context.getBaseElementType(Field->getType())); 6323 } 6324 } 6325 } 6326 ObjCImplementation->setIvarInitializers(Context, 6327 AllToInit.data(), AllToInit.size()); 6328 } 6329} 6330