SemaDeclCXX.cpp revision 55bcace250e1ff366e4482714b344b8cbc8be5f3
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(FD, Previous, OldDecl)) { 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 (isa<UsingShadowDecl>(OldDecl)) { 3663 // Silently ignore the possible conflict. 3664 return false; 3665 } 3666 3667 // If we're in a record, we want to hide the target, so we 3668 // return true (without a diagnostic) to tell the caller not to 3669 // build a shadow decl. 3670 if (CurContext->isRecord()) 3671 return true; 3672 3673 // If we're not in a record, this is an error. 3674 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3675 break; 3676 } 3677 3678 Diag(Target->getLocation(), diag::note_using_decl_target); 3679 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3680 return true; 3681 } 3682 3683 // Target is not a function. 3684 3685 if (isa<TagDecl>(Target)) { 3686 // No conflict between a tag and a non-tag. 3687 if (!Tag) return false; 3688 3689 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3690 Diag(Target->getLocation(), diag::note_using_decl_target); 3691 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3692 return true; 3693 } 3694 3695 // No conflict between a tag and a non-tag. 3696 if (!NonTag) return false; 3697 3698 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3699 Diag(Target->getLocation(), diag::note_using_decl_target); 3700 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3701 return true; 3702} 3703 3704/// Builds a shadow declaration corresponding to a 'using' declaration. 3705UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3706 UsingDecl *UD, 3707 NamedDecl *Orig) { 3708 3709 // If we resolved to another shadow declaration, just coalesce them. 3710 NamedDecl *Target = Orig; 3711 if (isa<UsingShadowDecl>(Target)) { 3712 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3713 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3714 } 3715 3716 UsingShadowDecl *Shadow 3717 = UsingShadowDecl::Create(Context, CurContext, 3718 UD->getLocation(), UD, Target); 3719 UD->addShadowDecl(Shadow); 3720 3721 if (S) 3722 PushOnScopeChains(Shadow, S); 3723 else 3724 CurContext->addDecl(Shadow); 3725 Shadow->setAccess(UD->getAccess()); 3726 3727 // Register it as a conversion if appropriate. 3728 if (Shadow->getDeclName().getNameKind() 3729 == DeclarationName::CXXConversionFunctionName) 3730 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3731 3732 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3733 Shadow->setInvalidDecl(); 3734 3735 return Shadow; 3736} 3737 3738/// Hides a using shadow declaration. This is required by the current 3739/// using-decl implementation when a resolvable using declaration in a 3740/// class is followed by a declaration which would hide or override 3741/// one or more of the using decl's targets; for example: 3742/// 3743/// struct Base { void foo(int); }; 3744/// struct Derived : Base { 3745/// using Base::foo; 3746/// void foo(int); 3747/// }; 3748/// 3749/// The governing language is C++03 [namespace.udecl]p12: 3750/// 3751/// When a using-declaration brings names from a base class into a 3752/// derived class scope, member functions in the derived class 3753/// override and/or hide member functions with the same name and 3754/// parameter types in a base class (rather than conflicting). 3755/// 3756/// There are two ways to implement this: 3757/// (1) optimistically create shadow decls when they're not hidden 3758/// by existing declarations, or 3759/// (2) don't create any shadow decls (or at least don't make them 3760/// visible) until we've fully parsed/instantiated the class. 3761/// The problem with (1) is that we might have to retroactively remove 3762/// a shadow decl, which requires several O(n) operations because the 3763/// decl structures are (very reasonably) not designed for removal. 3764/// (2) avoids this but is very fiddly and phase-dependent. 3765void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3766 if (Shadow->getDeclName().getNameKind() == 3767 DeclarationName::CXXConversionFunctionName) 3768 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3769 3770 // Remove it from the DeclContext... 3771 Shadow->getDeclContext()->removeDecl(Shadow); 3772 3773 // ...and the scope, if applicable... 3774 if (S) { 3775 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3776 IdResolver.RemoveDecl(Shadow); 3777 } 3778 3779 // ...and the using decl. 3780 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3781 3782 // TODO: complain somehow if Shadow was used. It shouldn't 3783 // be possible for this to happen, because...? 3784} 3785 3786/// Builds a using declaration. 3787/// 3788/// \param IsInstantiation - Whether this call arises from an 3789/// instantiation of an unresolved using declaration. We treat 3790/// the lookup differently for these declarations. 3791NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3792 SourceLocation UsingLoc, 3793 CXXScopeSpec &SS, 3794 SourceLocation IdentLoc, 3795 DeclarationName Name, 3796 AttributeList *AttrList, 3797 bool IsInstantiation, 3798 bool IsTypeName, 3799 SourceLocation TypenameLoc) { 3800 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3801 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3802 3803 // FIXME: We ignore attributes for now. 3804 delete AttrList; 3805 3806 if (SS.isEmpty()) { 3807 Diag(IdentLoc, diag::err_using_requires_qualname); 3808 return 0; 3809 } 3810 3811 // Do the redeclaration lookup in the current scope. 3812 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3813 ForRedeclaration); 3814 Previous.setHideTags(false); 3815 if (S) { 3816 LookupName(Previous, S); 3817 3818 // It is really dumb that we have to do this. 3819 LookupResult::Filter F = Previous.makeFilter(); 3820 while (F.hasNext()) { 3821 NamedDecl *D = F.next(); 3822 if (!isDeclInScope(D, CurContext, S)) 3823 F.erase(); 3824 } 3825 F.done(); 3826 } else { 3827 assert(IsInstantiation && "no scope in non-instantiation"); 3828 assert(CurContext->isRecord() && "scope not record in instantiation"); 3829 LookupQualifiedName(Previous, CurContext); 3830 } 3831 3832 NestedNameSpecifier *NNS = 3833 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3834 3835 // Check for invalid redeclarations. 3836 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3837 return 0; 3838 3839 // Check for bad qualifiers. 3840 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3841 return 0; 3842 3843 DeclContext *LookupContext = computeDeclContext(SS); 3844 NamedDecl *D; 3845 if (!LookupContext) { 3846 if (IsTypeName) { 3847 // FIXME: not all declaration name kinds are legal here 3848 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3849 UsingLoc, TypenameLoc, 3850 SS.getRange(), NNS, 3851 IdentLoc, Name); 3852 } else { 3853 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3854 UsingLoc, SS.getRange(), NNS, 3855 IdentLoc, Name); 3856 } 3857 } else { 3858 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3859 SS.getRange(), UsingLoc, NNS, Name, 3860 IsTypeName); 3861 } 3862 D->setAccess(AS); 3863 CurContext->addDecl(D); 3864 3865 if (!LookupContext) return D; 3866 UsingDecl *UD = cast<UsingDecl>(D); 3867 3868 if (RequireCompleteDeclContext(SS, LookupContext)) { 3869 UD->setInvalidDecl(); 3870 return UD; 3871 } 3872 3873 // Look up the target name. 3874 3875 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3876 3877 // Unlike most lookups, we don't always want to hide tag 3878 // declarations: tag names are visible through the using declaration 3879 // even if hidden by ordinary names, *except* in a dependent context 3880 // where it's important for the sanity of two-phase lookup. 3881 if (!IsInstantiation) 3882 R.setHideTags(false); 3883 3884 LookupQualifiedName(R, LookupContext); 3885 3886 if (R.empty()) { 3887 Diag(IdentLoc, diag::err_no_member) 3888 << Name << LookupContext << SS.getRange(); 3889 UD->setInvalidDecl(); 3890 return UD; 3891 } 3892 3893 if (R.isAmbiguous()) { 3894 UD->setInvalidDecl(); 3895 return UD; 3896 } 3897 3898 if (IsTypeName) { 3899 // If we asked for a typename and got a non-type decl, error out. 3900 if (!R.getAsSingle<TypeDecl>()) { 3901 Diag(IdentLoc, diag::err_using_typename_non_type); 3902 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3903 Diag((*I)->getUnderlyingDecl()->getLocation(), 3904 diag::note_using_decl_target); 3905 UD->setInvalidDecl(); 3906 return UD; 3907 } 3908 } else { 3909 // If we asked for a non-typename and we got a type, error out, 3910 // but only if this is an instantiation of an unresolved using 3911 // decl. Otherwise just silently find the type name. 3912 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3913 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3914 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3915 UD->setInvalidDecl(); 3916 return UD; 3917 } 3918 } 3919 3920 // C++0x N2914 [namespace.udecl]p6: 3921 // A using-declaration shall not name a namespace. 3922 if (R.getAsSingle<NamespaceDecl>()) { 3923 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3924 << SS.getRange(); 3925 UD->setInvalidDecl(); 3926 return UD; 3927 } 3928 3929 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3930 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3931 BuildUsingShadowDecl(S, UD, *I); 3932 } 3933 3934 return UD; 3935} 3936 3937/// Checks that the given using declaration is not an invalid 3938/// redeclaration. Note that this is checking only for the using decl 3939/// itself, not for any ill-formedness among the UsingShadowDecls. 3940bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3941 bool isTypeName, 3942 const CXXScopeSpec &SS, 3943 SourceLocation NameLoc, 3944 const LookupResult &Prev) { 3945 // C++03 [namespace.udecl]p8: 3946 // C++0x [namespace.udecl]p10: 3947 // A using-declaration is a declaration and can therefore be used 3948 // repeatedly where (and only where) multiple declarations are 3949 // allowed. 3950 // 3951 // That's in non-member contexts. 3952 if (!CurContext->getLookupContext()->isRecord()) 3953 return false; 3954 3955 NestedNameSpecifier *Qual 3956 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3957 3958 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3959 NamedDecl *D = *I; 3960 3961 bool DTypename; 3962 NestedNameSpecifier *DQual; 3963 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3964 DTypename = UD->isTypeName(); 3965 DQual = UD->getTargetNestedNameDecl(); 3966 } else if (UnresolvedUsingValueDecl *UD 3967 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3968 DTypename = false; 3969 DQual = UD->getTargetNestedNameSpecifier(); 3970 } else if (UnresolvedUsingTypenameDecl *UD 3971 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3972 DTypename = true; 3973 DQual = UD->getTargetNestedNameSpecifier(); 3974 } else continue; 3975 3976 // using decls differ if one says 'typename' and the other doesn't. 3977 // FIXME: non-dependent using decls? 3978 if (isTypeName != DTypename) continue; 3979 3980 // using decls differ if they name different scopes (but note that 3981 // template instantiation can cause this check to trigger when it 3982 // didn't before instantiation). 3983 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3984 Context.getCanonicalNestedNameSpecifier(DQual)) 3985 continue; 3986 3987 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3988 Diag(D->getLocation(), diag::note_using_decl) << 1; 3989 return true; 3990 } 3991 3992 return false; 3993} 3994 3995 3996/// Checks that the given nested-name qualifier used in a using decl 3997/// in the current context is appropriately related to the current 3998/// scope. If an error is found, diagnoses it and returns true. 3999bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4000 const CXXScopeSpec &SS, 4001 SourceLocation NameLoc) { 4002 DeclContext *NamedContext = computeDeclContext(SS); 4003 4004 if (!CurContext->isRecord()) { 4005 // C++03 [namespace.udecl]p3: 4006 // C++0x [namespace.udecl]p8: 4007 // A using-declaration for a class member shall be a member-declaration. 4008 4009 // If we weren't able to compute a valid scope, it must be a 4010 // dependent class scope. 4011 if (!NamedContext || NamedContext->isRecord()) { 4012 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4013 << SS.getRange(); 4014 return true; 4015 } 4016 4017 // Otherwise, everything is known to be fine. 4018 return false; 4019 } 4020 4021 // The current scope is a record. 4022 4023 // If the named context is dependent, we can't decide much. 4024 if (!NamedContext) { 4025 // FIXME: in C++0x, we can diagnose if we can prove that the 4026 // nested-name-specifier does not refer to a base class, which is 4027 // still possible in some cases. 4028 4029 // Otherwise we have to conservatively report that things might be 4030 // okay. 4031 return false; 4032 } 4033 4034 if (!NamedContext->isRecord()) { 4035 // Ideally this would point at the last name in the specifier, 4036 // but we don't have that level of source info. 4037 Diag(SS.getRange().getBegin(), 4038 diag::err_using_decl_nested_name_specifier_is_not_class) 4039 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4040 return true; 4041 } 4042 4043 if (getLangOptions().CPlusPlus0x) { 4044 // C++0x [namespace.udecl]p3: 4045 // In a using-declaration used as a member-declaration, the 4046 // nested-name-specifier shall name a base class of the class 4047 // being defined. 4048 4049 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4050 cast<CXXRecordDecl>(NamedContext))) { 4051 if (CurContext == NamedContext) { 4052 Diag(NameLoc, 4053 diag::err_using_decl_nested_name_specifier_is_current_class) 4054 << SS.getRange(); 4055 return true; 4056 } 4057 4058 Diag(SS.getRange().getBegin(), 4059 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4060 << (NestedNameSpecifier*) SS.getScopeRep() 4061 << cast<CXXRecordDecl>(CurContext) 4062 << SS.getRange(); 4063 return true; 4064 } 4065 4066 return false; 4067 } 4068 4069 // C++03 [namespace.udecl]p4: 4070 // A using-declaration used as a member-declaration shall refer 4071 // to a member of a base class of the class being defined [etc.]. 4072 4073 // Salient point: SS doesn't have to name a base class as long as 4074 // lookup only finds members from base classes. Therefore we can 4075 // diagnose here only if we can prove that that can't happen, 4076 // i.e. if the class hierarchies provably don't intersect. 4077 4078 // TODO: it would be nice if "definitely valid" results were cached 4079 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4080 // need to be repeated. 4081 4082 struct UserData { 4083 llvm::DenseSet<const CXXRecordDecl*> Bases; 4084 4085 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4086 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4087 Data->Bases.insert(Base); 4088 return true; 4089 } 4090 4091 bool hasDependentBases(const CXXRecordDecl *Class) { 4092 return !Class->forallBases(collect, this); 4093 } 4094 4095 /// Returns true if the base is dependent or is one of the 4096 /// accumulated base classes. 4097 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4098 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4099 return !Data->Bases.count(Base); 4100 } 4101 4102 bool mightShareBases(const CXXRecordDecl *Class) { 4103 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4104 } 4105 }; 4106 4107 UserData Data; 4108 4109 // Returns false if we find a dependent base. 4110 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4111 return false; 4112 4113 // Returns false if the class has a dependent base or if it or one 4114 // of its bases is present in the base set of the current context. 4115 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4116 return false; 4117 4118 Diag(SS.getRange().getBegin(), 4119 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4120 << (NestedNameSpecifier*) SS.getScopeRep() 4121 << cast<CXXRecordDecl>(CurContext) 4122 << SS.getRange(); 4123 4124 return true; 4125} 4126 4127Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 4128 SourceLocation NamespaceLoc, 4129 SourceLocation AliasLoc, 4130 IdentifierInfo *Alias, 4131 CXXScopeSpec &SS, 4132 SourceLocation IdentLoc, 4133 IdentifierInfo *Ident) { 4134 4135 // Lookup the namespace name. 4136 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4137 LookupParsedName(R, S, &SS); 4138 4139 // Check if we have a previous declaration with the same name. 4140 NamedDecl *PrevDecl 4141 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4142 ForRedeclaration); 4143 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4144 PrevDecl = 0; 4145 4146 if (PrevDecl) { 4147 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4148 // We already have an alias with the same name that points to the same 4149 // namespace, so don't create a new one. 4150 // FIXME: At some point, we'll want to create the (redundant) 4151 // declaration to maintain better source information. 4152 if (!R.isAmbiguous() && !R.empty() && 4153 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4154 return DeclPtrTy(); 4155 } 4156 4157 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4158 diag::err_redefinition_different_kind; 4159 Diag(AliasLoc, DiagID) << Alias; 4160 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4161 return DeclPtrTy(); 4162 } 4163 4164 if (R.isAmbiguous()) 4165 return DeclPtrTy(); 4166 4167 if (R.empty()) { 4168 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4169 return DeclPtrTy(); 4170 } 4171 4172 NamespaceAliasDecl *AliasDecl = 4173 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4174 Alias, SS.getRange(), 4175 (NestedNameSpecifier *)SS.getScopeRep(), 4176 IdentLoc, R.getFoundDecl()); 4177 4178 PushOnScopeChains(AliasDecl, S); 4179 return DeclPtrTy::make(AliasDecl); 4180} 4181 4182namespace { 4183 /// \brief Scoped object used to handle the state changes required in Sema 4184 /// to implicitly define the body of a C++ member function; 4185 class ImplicitlyDefinedFunctionScope { 4186 Sema &S; 4187 DeclContext *PreviousContext; 4188 4189 public: 4190 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4191 : S(S), PreviousContext(S.CurContext) 4192 { 4193 S.CurContext = Method; 4194 S.PushFunctionScope(); 4195 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4196 } 4197 4198 ~ImplicitlyDefinedFunctionScope() { 4199 S.PopExpressionEvaluationContext(); 4200 S.PopFunctionOrBlockScope(); 4201 S.CurContext = PreviousContext; 4202 } 4203 }; 4204} 4205 4206void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4207 CXXConstructorDecl *Constructor) { 4208 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4209 !Constructor->isUsed()) && 4210 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4211 4212 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4213 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4214 4215 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4216 ErrorTrap Trap(*this); 4217 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4218 Trap.hasErrorOccurred()) { 4219 Diag(CurrentLocation, diag::note_member_synthesized_at) 4220 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4221 Constructor->setInvalidDecl(); 4222 } else { 4223 Constructor->setUsed(); 4224 MarkVTableUsed(CurrentLocation, ClassDecl); 4225 } 4226} 4227 4228void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4229 CXXDestructorDecl *Destructor) { 4230 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 4231 "DefineImplicitDestructor - call it for implicit default dtor"); 4232 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4233 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4234 4235 if (Destructor->isInvalidDecl()) 4236 return; 4237 4238 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4239 4240 ErrorTrap Trap(*this); 4241 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4242 Destructor->getParent()); 4243 4244 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4245 Diag(CurrentLocation, diag::note_member_synthesized_at) 4246 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4247 4248 Destructor->setInvalidDecl(); 4249 return; 4250 } 4251 4252 Destructor->setUsed(); 4253 MarkVTableUsed(CurrentLocation, ClassDecl); 4254} 4255 4256/// \brief Builds a statement that copies the given entity from \p From to 4257/// \c To. 4258/// 4259/// This routine is used to copy the members of a class with an 4260/// implicitly-declared copy assignment operator. When the entities being 4261/// copied are arrays, this routine builds for loops to copy them. 4262/// 4263/// \param S The Sema object used for type-checking. 4264/// 4265/// \param Loc The location where the implicit copy is being generated. 4266/// 4267/// \param T The type of the expressions being copied. Both expressions must 4268/// have this type. 4269/// 4270/// \param To The expression we are copying to. 4271/// 4272/// \param From The expression we are copying from. 4273/// 4274/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4275/// Otherwise, it's a non-static member subobject. 4276/// 4277/// \param Depth Internal parameter recording the depth of the recursion. 4278/// 4279/// \returns A statement or a loop that copies the expressions. 4280static Sema::OwningStmtResult 4281BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4282 Sema::OwningExprResult To, Sema::OwningExprResult From, 4283 bool CopyingBaseSubobject, unsigned Depth = 0) { 4284 typedef Sema::OwningStmtResult OwningStmtResult; 4285 typedef Sema::OwningExprResult OwningExprResult; 4286 4287 // C++0x [class.copy]p30: 4288 // Each subobject is assigned in the manner appropriate to its type: 4289 // 4290 // - if the subobject is of class type, the copy assignment operator 4291 // for the class is used (as if by explicit qualification; that is, 4292 // ignoring any possible virtual overriding functions in more derived 4293 // classes); 4294 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4295 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4296 4297 // Look for operator=. 4298 DeclarationName Name 4299 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4300 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4301 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4302 4303 // Filter out any result that isn't a copy-assignment operator. 4304 LookupResult::Filter F = OpLookup.makeFilter(); 4305 while (F.hasNext()) { 4306 NamedDecl *D = F.next(); 4307 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4308 if (Method->isCopyAssignmentOperator()) 4309 continue; 4310 4311 F.erase(); 4312 } 4313 F.done(); 4314 4315 // Suppress the protected check (C++ [class.protected]) for each of the 4316 // assignment operators we found. This strange dance is required when 4317 // we're assigning via a base classes's copy-assignment operator. To 4318 // ensure that we're getting the right base class subobject (without 4319 // ambiguities), we need to cast "this" to that subobject type; to 4320 // ensure that we don't go through the virtual call mechanism, we need 4321 // to qualify the operator= name with the base class (see below). However, 4322 // this means that if the base class has a protected copy assignment 4323 // operator, the protected member access check will fail. So, we 4324 // rewrite "protected" access to "public" access in this case, since we 4325 // know by construction that we're calling from a derived class. 4326 if (CopyingBaseSubobject) { 4327 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4328 L != LEnd; ++L) { 4329 if (L.getAccess() == AS_protected) 4330 L.setAccess(AS_public); 4331 } 4332 } 4333 4334 // Create the nested-name-specifier that will be used to qualify the 4335 // reference to operator=; this is required to suppress the virtual 4336 // call mechanism. 4337 CXXScopeSpec SS; 4338 SS.setRange(Loc); 4339 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4340 T.getTypePtr())); 4341 4342 // Create the reference to operator=. 4343 OwningExprResult OpEqualRef 4344 = S.BuildMemberReferenceExpr(move(To), T, Loc, /*isArrow=*/false, SS, 4345 /*FirstQualifierInScope=*/0, OpLookup, 4346 /*TemplateArgs=*/0, 4347 /*SuppressQualifierCheck=*/true); 4348 if (OpEqualRef.isInvalid()) 4349 return S.StmtError(); 4350 4351 // Build the call to the assignment operator. 4352 Expr *FromE = From.takeAs<Expr>(); 4353 OwningExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4354 OpEqualRef.takeAs<Expr>(), 4355 Loc, &FromE, 1, 0, Loc); 4356 if (Call.isInvalid()) 4357 return S.StmtError(); 4358 4359 return S.Owned(Call.takeAs<Stmt>()); 4360 } 4361 4362 // - if the subobject is of scalar type, the built-in assignment 4363 // operator is used. 4364 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4365 if (!ArrayTy) { 4366 OwningExprResult Assignment = S.CreateBuiltinBinOp(Loc, 4367 BinaryOperator::Assign, 4368 To.takeAs<Expr>(), 4369 From.takeAs<Expr>()); 4370 if (Assignment.isInvalid()) 4371 return S.StmtError(); 4372 4373 return S.Owned(Assignment.takeAs<Stmt>()); 4374 } 4375 4376 // - if the subobject is an array, each element is assigned, in the 4377 // manner appropriate to the element type; 4378 4379 // Construct a loop over the array bounds, e.g., 4380 // 4381 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4382 // 4383 // that will copy each of the array elements. 4384 QualType SizeType = S.Context.getSizeType(); 4385 4386 // Create the iteration variable. 4387 IdentifierInfo *IterationVarName = 0; 4388 { 4389 llvm::SmallString<8> Str; 4390 llvm::raw_svector_ostream OS(Str); 4391 OS << "__i" << Depth; 4392 IterationVarName = &S.Context.Idents.get(OS.str()); 4393 } 4394 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4395 IterationVarName, SizeType, 4396 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4397 VarDecl::None, VarDecl::None); 4398 4399 // Initialize the iteration variable to zero. 4400 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4401 IterationVar->setInit(new (S.Context) IntegerLiteral(Zero, SizeType, Loc)); 4402 4403 // Create a reference to the iteration variable; we'll use this several 4404 // times throughout. 4405 Expr *IterationVarRef 4406 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4407 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4408 4409 // Create the DeclStmt that holds the iteration variable. 4410 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4411 4412 // Create the comparison against the array bound. 4413 llvm::APInt Upper = ArrayTy->getSize(); 4414 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4415 OwningExprResult Comparison 4416 = S.Owned(new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4417 new (S.Context) IntegerLiteral(Upper, SizeType, Loc), 4418 BinaryOperator::NE, S.Context.BoolTy, Loc)); 4419 4420 // Create the pre-increment of the iteration variable. 4421 OwningExprResult Increment 4422 = S.Owned(new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4423 UnaryOperator::PreInc, 4424 SizeType, Loc)); 4425 4426 // Subscript the "from" and "to" expressions with the iteration variable. 4427 From = S.CreateBuiltinArraySubscriptExpr(move(From), Loc, 4428 S.Owned(IterationVarRef->Retain()), 4429 Loc); 4430 To = S.CreateBuiltinArraySubscriptExpr(move(To), Loc, 4431 S.Owned(IterationVarRef->Retain()), 4432 Loc); 4433 assert(!From.isInvalid() && "Builtin subscripting can't fail!"); 4434 assert(!To.isInvalid() && "Builtin subscripting can't fail!"); 4435 4436 // Build the copy for an individual element of the array. 4437 OwningStmtResult Copy = BuildSingleCopyAssign(S, Loc, 4438 ArrayTy->getElementType(), 4439 move(To), move(From), 4440 CopyingBaseSubobject, Depth+1); 4441 if (Copy.isInvalid()) { 4442 InitStmt->Destroy(S.Context); 4443 return S.StmtError(); 4444 } 4445 4446 // Construct the loop that copies all elements of this array. 4447 return S.ActOnForStmt(Loc, Loc, S.Owned(InitStmt), 4448 S.MakeFullExpr(Comparison), 4449 Sema::DeclPtrTy(), 4450 S.MakeFullExpr(Increment), 4451 Loc, move(Copy)); 4452} 4453 4454void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4455 CXXMethodDecl *CopyAssignOperator) { 4456 assert((CopyAssignOperator->isImplicit() && 4457 CopyAssignOperator->isOverloadedOperator() && 4458 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4459 !CopyAssignOperator->isUsed()) && 4460 "DefineImplicitCopyAssignment called for wrong function"); 4461 4462 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4463 4464 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4465 CopyAssignOperator->setInvalidDecl(); 4466 return; 4467 } 4468 4469 CopyAssignOperator->setUsed(); 4470 4471 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4472 ErrorTrap Trap(*this); 4473 4474 // C++0x [class.copy]p30: 4475 // The implicitly-defined or explicitly-defaulted copy assignment operator 4476 // for a non-union class X performs memberwise copy assignment of its 4477 // subobjects. The direct base classes of X are assigned first, in the 4478 // order of their declaration in the base-specifier-list, and then the 4479 // immediate non-static data members of X are assigned, in the order in 4480 // which they were declared in the class definition. 4481 4482 // The statements that form the synthesized function body. 4483 ASTOwningVector<&ActionBase::DeleteStmt> Statements(*this); 4484 4485 // The parameter for the "other" object, which we are copying from. 4486 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4487 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4488 QualType OtherRefType = Other->getType(); 4489 if (const LValueReferenceType *OtherRef 4490 = OtherRefType->getAs<LValueReferenceType>()) { 4491 OtherRefType = OtherRef->getPointeeType(); 4492 OtherQuals = OtherRefType.getQualifiers(); 4493 } 4494 4495 // Our location for everything implicitly-generated. 4496 SourceLocation Loc = CopyAssignOperator->getLocation(); 4497 4498 // Construct a reference to the "other" object. We'll be using this 4499 // throughout the generated ASTs. 4500 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4501 assert(OtherRef && "Reference to parameter cannot fail!"); 4502 4503 // Construct the "this" pointer. We'll be using this throughout the generated 4504 // ASTs. 4505 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4506 assert(This && "Reference to this cannot fail!"); 4507 4508 // Assign base classes. 4509 bool Invalid = false; 4510 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4511 E = ClassDecl->bases_end(); Base != E; ++Base) { 4512 // Form the assignment: 4513 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4514 QualType BaseType = Base->getType().getUnqualifiedType(); 4515 CXXRecordDecl *BaseClassDecl = 0; 4516 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4517 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4518 else { 4519 Invalid = true; 4520 continue; 4521 } 4522 4523 // Construct the "from" expression, which is an implicit cast to the 4524 // appropriately-qualified base type. 4525 Expr *From = OtherRef->Retain(); 4526 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4527 CastExpr::CK_UncheckedDerivedToBase, /*isLvalue=*/true, 4528 CXXBaseSpecifierArray(Base)); 4529 4530 // Dereference "this". 4531 OwningExprResult To = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4532 Owned(This->Retain())); 4533 4534 // Implicitly cast "this" to the appropriately-qualified base type. 4535 Expr *ToE = To.takeAs<Expr>(); 4536 ImpCastExprToType(ToE, 4537 Context.getCVRQualifiedType(BaseType, 4538 CopyAssignOperator->getTypeQualifiers()), 4539 CastExpr::CK_UncheckedDerivedToBase, 4540 /*isLvalue=*/true, CXXBaseSpecifierArray(Base)); 4541 To = Owned(ToE); 4542 4543 // Build the copy. 4544 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4545 move(To), Owned(From), 4546 /*CopyingBaseSubobject=*/true); 4547 if (Copy.isInvalid()) { 4548 Diag(CurrentLocation, diag::note_member_synthesized_at) 4549 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4550 CopyAssignOperator->setInvalidDecl(); 4551 return; 4552 } 4553 4554 // Success! Record the copy. 4555 Statements.push_back(Copy.takeAs<Expr>()); 4556 } 4557 4558 // \brief Reference to the __builtin_memcpy function. 4559 Expr *BuiltinMemCpyRef = 0; 4560 // \brief Reference to the objc_memmove_collectable function. 4561 Expr *CollectableMemCpyRef = 0; 4562 4563 // Assign non-static members. 4564 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4565 FieldEnd = ClassDecl->field_end(); 4566 Field != FieldEnd; ++Field) { 4567 // Check for members of reference type; we can't copy those. 4568 if (Field->getType()->isReferenceType()) { 4569 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4570 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4571 Diag(Field->getLocation(), diag::note_declared_at); 4572 Diag(CurrentLocation, diag::note_member_synthesized_at) 4573 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4574 Invalid = true; 4575 continue; 4576 } 4577 4578 // Check for members of const-qualified, non-class type. 4579 QualType BaseType = Context.getBaseElementType(Field->getType()); 4580 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4581 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4582 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4583 Diag(Field->getLocation(), diag::note_declared_at); 4584 Diag(CurrentLocation, diag::note_member_synthesized_at) 4585 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4586 Invalid = true; 4587 continue; 4588 } 4589 4590 QualType FieldType = Field->getType().getNonReferenceType(); 4591 if (FieldType->isIncompleteArrayType()) { 4592 assert(ClassDecl->hasFlexibleArrayMember() && 4593 "Incomplete array type is not valid"); 4594 continue; 4595 } 4596 4597 // Build references to the field in the object we're copying from and to. 4598 CXXScopeSpec SS; // Intentionally empty 4599 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 4600 LookupMemberName); 4601 MemberLookup.addDecl(*Field); 4602 MemberLookup.resolveKind(); 4603 OwningExprResult From = BuildMemberReferenceExpr(Owned(OtherRef->Retain()), 4604 OtherRefType, 4605 Loc, /*IsArrow=*/false, 4606 SS, 0, MemberLookup, 0); 4607 OwningExprResult To = BuildMemberReferenceExpr(Owned(This->Retain()), 4608 This->getType(), 4609 Loc, /*IsArrow=*/true, 4610 SS, 0, MemberLookup, 0); 4611 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 4612 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 4613 4614 // If the field should be copied with __builtin_memcpy rather than via 4615 // explicit assignments, do so. This optimization only applies for arrays 4616 // of scalars and arrays of class type with trivial copy-assignment 4617 // operators. 4618 if (FieldType->isArrayType() && 4619 (!BaseType->isRecordType() || 4620 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 4621 ->hasTrivialCopyAssignment())) { 4622 // Compute the size of the memory buffer to be copied. 4623 QualType SizeType = Context.getSizeType(); 4624 llvm::APInt Size(Context.getTypeSize(SizeType), 4625 Context.getTypeSizeInChars(BaseType).getQuantity()); 4626 for (const ConstantArrayType *Array 4627 = Context.getAsConstantArrayType(FieldType); 4628 Array; 4629 Array = Context.getAsConstantArrayType(Array->getElementType())) { 4630 llvm::APInt ArraySize = Array->getSize(); 4631 ArraySize.zextOrTrunc(Size.getBitWidth()); 4632 Size *= ArraySize; 4633 } 4634 4635 // Take the address of the field references for "from" and "to". 4636 From = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(From)); 4637 To = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(To)); 4638 4639 bool NeedsCollectableMemCpy = 4640 (BaseType->isRecordType() && 4641 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 4642 4643 if (NeedsCollectableMemCpy) { 4644 if (!CollectableMemCpyRef) { 4645 // Create a reference to the objc_memmove_collectable function. 4646 LookupResult R(*this, &Context.Idents.get("objc_memmove_collectable"), 4647 Loc, LookupOrdinaryName); 4648 LookupName(R, TUScope, true); 4649 4650 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 4651 if (!CollectableMemCpy) { 4652 // Something went horribly wrong earlier, and we will have 4653 // complained about it. 4654 Invalid = true; 4655 continue; 4656 } 4657 4658 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 4659 CollectableMemCpy->getType(), 4660 Loc, 0).takeAs<Expr>(); 4661 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 4662 } 4663 } 4664 // Create a reference to the __builtin_memcpy builtin function. 4665 else if (!BuiltinMemCpyRef) { 4666 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 4667 LookupOrdinaryName); 4668 LookupName(R, TUScope, true); 4669 4670 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 4671 if (!BuiltinMemCpy) { 4672 // Something went horribly wrong earlier, and we will have complained 4673 // about it. 4674 Invalid = true; 4675 continue; 4676 } 4677 4678 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 4679 BuiltinMemCpy->getType(), 4680 Loc, 0).takeAs<Expr>(); 4681 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 4682 } 4683 4684 ASTOwningVector<&ActionBase::DeleteExpr> CallArgs(*this); 4685 CallArgs.push_back(To.takeAs<Expr>()); 4686 CallArgs.push_back(From.takeAs<Expr>()); 4687 CallArgs.push_back(new (Context) IntegerLiteral(Size, SizeType, Loc)); 4688 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 4689 Commas.push_back(Loc); 4690 Commas.push_back(Loc); 4691 OwningExprResult Call = ActOnCallExpr(/*Scope=*/0, 4692 NeedsCollectableMemCpy ? 4693 Owned(CollectableMemCpyRef->Retain()) : 4694 Owned(BuiltinMemCpyRef->Retain()), 4695 Loc, move_arg(CallArgs), 4696 Commas.data(), Loc); 4697 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 4698 Statements.push_back(Call.takeAs<Expr>()); 4699 continue; 4700 } 4701 4702 // Build the copy of this field. 4703 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 4704 move(To), move(From), 4705 /*CopyingBaseSubobject=*/false); 4706 if (Copy.isInvalid()) { 4707 Diag(CurrentLocation, diag::note_member_synthesized_at) 4708 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4709 CopyAssignOperator->setInvalidDecl(); 4710 return; 4711 } 4712 4713 // Success! Record the copy. 4714 Statements.push_back(Copy.takeAs<Stmt>()); 4715 } 4716 4717 if (!Invalid) { 4718 // Add a "return *this;" 4719 OwningExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4720 Owned(This->Retain())); 4721 4722 OwningStmtResult Return = ActOnReturnStmt(Loc, move(ThisObj)); 4723 if (Return.isInvalid()) 4724 Invalid = true; 4725 else { 4726 Statements.push_back(Return.takeAs<Stmt>()); 4727 4728 if (Trap.hasErrorOccurred()) { 4729 Diag(CurrentLocation, diag::note_member_synthesized_at) 4730 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4731 Invalid = true; 4732 } 4733 } 4734 } 4735 4736 if (Invalid) { 4737 CopyAssignOperator->setInvalidDecl(); 4738 return; 4739 } 4740 4741 OwningStmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 4742 /*isStmtExpr=*/false); 4743 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 4744 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 4745} 4746 4747void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 4748 CXXConstructorDecl *CopyConstructor, 4749 unsigned TypeQuals) { 4750 assert((CopyConstructor->isImplicit() && 4751 CopyConstructor->isCopyConstructor(TypeQuals) && 4752 !CopyConstructor->isUsed()) && 4753 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 4754 4755 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 4756 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 4757 4758 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 4759 ErrorTrap Trap(*this); 4760 4761 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 4762 Trap.hasErrorOccurred()) { 4763 Diag(CurrentLocation, diag::note_member_synthesized_at) 4764 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 4765 CopyConstructor->setInvalidDecl(); 4766 } else { 4767 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 4768 CopyConstructor->getLocation(), 4769 MultiStmtArg(*this, 0, 0), 4770 /*isStmtExpr=*/false) 4771 .takeAs<Stmt>()); 4772 } 4773 4774 CopyConstructor->setUsed(); 4775} 4776 4777Sema::OwningExprResult 4778Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4779 CXXConstructorDecl *Constructor, 4780 MultiExprArg ExprArgs, 4781 bool RequiresZeroInit, 4782 CXXConstructExpr::ConstructionKind ConstructKind) { 4783 bool Elidable = false; 4784 4785 // C++0x [class.copy]p34: 4786 // When certain criteria are met, an implementation is allowed to 4787 // omit the copy/move construction of a class object, even if the 4788 // copy/move constructor and/or destructor for the object have 4789 // side effects. [...] 4790 // - when a temporary class object that has not been bound to a 4791 // reference (12.2) would be copied/moved to a class object 4792 // with the same cv-unqualified type, the copy/move operation 4793 // can be omitted by constructing the temporary object 4794 // directly into the target of the omitted copy/move 4795 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 4796 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 4797 Elidable = SubExpr->isTemporaryObject() && 4798 Context.hasSameUnqualifiedType(SubExpr->getType(), 4799 Context.getTypeDeclType(Constructor->getParent())); 4800 } 4801 4802 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 4803 Elidable, move(ExprArgs), RequiresZeroInit, 4804 ConstructKind); 4805} 4806 4807/// BuildCXXConstructExpr - Creates a complete call to a constructor, 4808/// including handling of its default argument expressions. 4809Sema::OwningExprResult 4810Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 4811 CXXConstructorDecl *Constructor, bool Elidable, 4812 MultiExprArg ExprArgs, 4813 bool RequiresZeroInit, 4814 CXXConstructExpr::ConstructionKind ConstructKind) { 4815 unsigned NumExprs = ExprArgs.size(); 4816 Expr **Exprs = (Expr **)ExprArgs.release(); 4817 4818 MarkDeclarationReferenced(ConstructLoc, Constructor); 4819 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 4820 Constructor, Elidable, Exprs, NumExprs, 4821 RequiresZeroInit, ConstructKind)); 4822} 4823 4824bool Sema::InitializeVarWithConstructor(VarDecl *VD, 4825 CXXConstructorDecl *Constructor, 4826 MultiExprArg Exprs) { 4827 OwningExprResult TempResult = 4828 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 4829 move(Exprs)); 4830 if (TempResult.isInvalid()) 4831 return true; 4832 4833 Expr *Temp = TempResult.takeAs<Expr>(); 4834 MarkDeclarationReferenced(VD->getLocation(), Constructor); 4835 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 4836 VD->setInit(Temp); 4837 4838 return false; 4839} 4840 4841void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 4842 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 4843 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 4844 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 4845 CXXDestructorDecl *Destructor = ClassDecl->getDestructor(Context); 4846 MarkDeclarationReferenced(VD->getLocation(), Destructor); 4847 CheckDestructorAccess(VD->getLocation(), Destructor, 4848 PDiag(diag::err_access_dtor_var) 4849 << VD->getDeclName() 4850 << VD->getType()); 4851 } 4852} 4853 4854/// AddCXXDirectInitializerToDecl - This action is called immediately after 4855/// ActOnDeclarator, when a C++ direct initializer is present. 4856/// e.g: "int x(1);" 4857void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 4858 SourceLocation LParenLoc, 4859 MultiExprArg Exprs, 4860 SourceLocation *CommaLocs, 4861 SourceLocation RParenLoc) { 4862 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 4863 Decl *RealDecl = Dcl.getAs<Decl>(); 4864 4865 // If there is no declaration, there was an error parsing it. Just ignore 4866 // the initializer. 4867 if (RealDecl == 0) 4868 return; 4869 4870 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4871 if (!VDecl) { 4872 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4873 RealDecl->setInvalidDecl(); 4874 return; 4875 } 4876 4877 // We will represent direct-initialization similarly to copy-initialization: 4878 // int x(1); -as-> int x = 1; 4879 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 4880 // 4881 // Clients that want to distinguish between the two forms, can check for 4882 // direct initializer using VarDecl::hasCXXDirectInitializer(). 4883 // A major benefit is that clients that don't particularly care about which 4884 // exactly form was it (like the CodeGen) can handle both cases without 4885 // special case code. 4886 4887 // C++ 8.5p11: 4888 // The form of initialization (using parentheses or '=') is generally 4889 // insignificant, but does matter when the entity being initialized has a 4890 // class type. 4891 QualType DeclInitType = VDecl->getType(); 4892 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 4893 DeclInitType = Context.getBaseElementType(Array); 4894 4895 if (!VDecl->getType()->isDependentType() && 4896 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 4897 diag::err_typecheck_decl_incomplete_type)) { 4898 VDecl->setInvalidDecl(); 4899 return; 4900 } 4901 4902 // The variable can not have an abstract class type. 4903 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4904 diag::err_abstract_type_in_decl, 4905 AbstractVariableType)) 4906 VDecl->setInvalidDecl(); 4907 4908 const VarDecl *Def; 4909 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4910 Diag(VDecl->getLocation(), diag::err_redefinition) 4911 << VDecl->getDeclName(); 4912 Diag(Def->getLocation(), diag::note_previous_definition); 4913 VDecl->setInvalidDecl(); 4914 return; 4915 } 4916 4917 // If either the declaration has a dependent type or if any of the 4918 // expressions is type-dependent, we represent the initialization 4919 // via a ParenListExpr for later use during template instantiation. 4920 if (VDecl->getType()->isDependentType() || 4921 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 4922 // Let clients know that initialization was done with a direct initializer. 4923 VDecl->setCXXDirectInitializer(true); 4924 4925 // Store the initialization expressions as a ParenListExpr. 4926 unsigned NumExprs = Exprs.size(); 4927 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 4928 (Expr **)Exprs.release(), 4929 NumExprs, RParenLoc)); 4930 return; 4931 } 4932 4933 // Capture the variable that is being initialized and the style of 4934 // initialization. 4935 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4936 4937 // FIXME: Poor source location information. 4938 InitializationKind Kind 4939 = InitializationKind::CreateDirect(VDecl->getLocation(), 4940 LParenLoc, RParenLoc); 4941 4942 InitializationSequence InitSeq(*this, Entity, Kind, 4943 (Expr**)Exprs.get(), Exprs.size()); 4944 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 4945 if (Result.isInvalid()) { 4946 VDecl->setInvalidDecl(); 4947 return; 4948 } 4949 4950 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 4951 VDecl->setInit(Result.takeAs<Expr>()); 4952 VDecl->setCXXDirectInitializer(true); 4953 4954 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 4955 FinalizeVarWithDestructor(VDecl, Record); 4956} 4957 4958/// \brief Given a constructor and the set of arguments provided for the 4959/// constructor, convert the arguments and add any required default arguments 4960/// to form a proper call to this constructor. 4961/// 4962/// \returns true if an error occurred, false otherwise. 4963bool 4964Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 4965 MultiExprArg ArgsPtr, 4966 SourceLocation Loc, 4967 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 4968 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 4969 unsigned NumArgs = ArgsPtr.size(); 4970 Expr **Args = (Expr **)ArgsPtr.get(); 4971 4972 const FunctionProtoType *Proto 4973 = Constructor->getType()->getAs<FunctionProtoType>(); 4974 assert(Proto && "Constructor without a prototype?"); 4975 unsigned NumArgsInProto = Proto->getNumArgs(); 4976 4977 // If too few arguments are available, we'll fill in the rest with defaults. 4978 if (NumArgs < NumArgsInProto) 4979 ConvertedArgs.reserve(NumArgsInProto); 4980 else 4981 ConvertedArgs.reserve(NumArgs); 4982 4983 VariadicCallType CallType = 4984 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 4985 llvm::SmallVector<Expr *, 8> AllArgs; 4986 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 4987 Proto, 0, Args, NumArgs, AllArgs, 4988 CallType); 4989 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 4990 ConvertedArgs.push_back(AllArgs[i]); 4991 return Invalid; 4992} 4993 4994static inline bool 4995CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 4996 const FunctionDecl *FnDecl) { 4997 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 4998 if (isa<NamespaceDecl>(DC)) { 4999 return SemaRef.Diag(FnDecl->getLocation(), 5000 diag::err_operator_new_delete_declared_in_namespace) 5001 << FnDecl->getDeclName(); 5002 } 5003 5004 if (isa<TranslationUnitDecl>(DC) && 5005 FnDecl->getStorageClass() == FunctionDecl::Static) { 5006 return SemaRef.Diag(FnDecl->getLocation(), 5007 diag::err_operator_new_delete_declared_static) 5008 << FnDecl->getDeclName(); 5009 } 5010 5011 return false; 5012} 5013 5014static inline bool 5015CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5016 CanQualType ExpectedResultType, 5017 CanQualType ExpectedFirstParamType, 5018 unsigned DependentParamTypeDiag, 5019 unsigned InvalidParamTypeDiag) { 5020 QualType ResultType = 5021 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5022 5023 // Check that the result type is not dependent. 5024 if (ResultType->isDependentType()) 5025 return SemaRef.Diag(FnDecl->getLocation(), 5026 diag::err_operator_new_delete_dependent_result_type) 5027 << FnDecl->getDeclName() << ExpectedResultType; 5028 5029 // Check that the result type is what we expect. 5030 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5031 return SemaRef.Diag(FnDecl->getLocation(), 5032 diag::err_operator_new_delete_invalid_result_type) 5033 << FnDecl->getDeclName() << ExpectedResultType; 5034 5035 // A function template must have at least 2 parameters. 5036 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5037 return SemaRef.Diag(FnDecl->getLocation(), 5038 diag::err_operator_new_delete_template_too_few_parameters) 5039 << FnDecl->getDeclName(); 5040 5041 // The function decl must have at least 1 parameter. 5042 if (FnDecl->getNumParams() == 0) 5043 return SemaRef.Diag(FnDecl->getLocation(), 5044 diag::err_operator_new_delete_too_few_parameters) 5045 << FnDecl->getDeclName(); 5046 5047 // Check the the first parameter type is not dependent. 5048 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5049 if (FirstParamType->isDependentType()) 5050 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5051 << FnDecl->getDeclName() << ExpectedFirstParamType; 5052 5053 // Check that the first parameter type is what we expect. 5054 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5055 ExpectedFirstParamType) 5056 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5057 << FnDecl->getDeclName() << ExpectedFirstParamType; 5058 5059 return false; 5060} 5061 5062static bool 5063CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5064 // C++ [basic.stc.dynamic.allocation]p1: 5065 // A program is ill-formed if an allocation function is declared in a 5066 // namespace scope other than global scope or declared static in global 5067 // scope. 5068 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5069 return true; 5070 5071 CanQualType SizeTy = 5072 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5073 5074 // C++ [basic.stc.dynamic.allocation]p1: 5075 // The return type shall be void*. The first parameter shall have type 5076 // std::size_t. 5077 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5078 SizeTy, 5079 diag::err_operator_new_dependent_param_type, 5080 diag::err_operator_new_param_type)) 5081 return true; 5082 5083 // C++ [basic.stc.dynamic.allocation]p1: 5084 // The first parameter shall not have an associated default argument. 5085 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5086 return SemaRef.Diag(FnDecl->getLocation(), 5087 diag::err_operator_new_default_arg) 5088 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5089 5090 return false; 5091} 5092 5093static bool 5094CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5095 // C++ [basic.stc.dynamic.deallocation]p1: 5096 // A program is ill-formed if deallocation functions are declared in a 5097 // namespace scope other than global scope or declared static in global 5098 // scope. 5099 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5100 return true; 5101 5102 // C++ [basic.stc.dynamic.deallocation]p2: 5103 // Each deallocation function shall return void and its first parameter 5104 // shall be void*. 5105 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5106 SemaRef.Context.VoidPtrTy, 5107 diag::err_operator_delete_dependent_param_type, 5108 diag::err_operator_delete_param_type)) 5109 return true; 5110 5111 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5112 if (FirstParamType->isDependentType()) 5113 return SemaRef.Diag(FnDecl->getLocation(), 5114 diag::err_operator_delete_dependent_param_type) 5115 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5116 5117 if (SemaRef.Context.getCanonicalType(FirstParamType) != 5118 SemaRef.Context.VoidPtrTy) 5119 return SemaRef.Diag(FnDecl->getLocation(), 5120 diag::err_operator_delete_param_type) 5121 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5122 5123 return false; 5124} 5125 5126/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5127/// of this overloaded operator is well-formed. If so, returns false; 5128/// otherwise, emits appropriate diagnostics and returns true. 5129bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5130 assert(FnDecl && FnDecl->isOverloadedOperator() && 5131 "Expected an overloaded operator declaration"); 5132 5133 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5134 5135 // C++ [over.oper]p5: 5136 // The allocation and deallocation functions, operator new, 5137 // operator new[], operator delete and operator delete[], are 5138 // described completely in 3.7.3. The attributes and restrictions 5139 // found in the rest of this subclause do not apply to them unless 5140 // explicitly stated in 3.7.3. 5141 if (Op == OO_Delete || Op == OO_Array_Delete) 5142 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5143 5144 if (Op == OO_New || Op == OO_Array_New) 5145 return CheckOperatorNewDeclaration(*this, FnDecl); 5146 5147 // C++ [over.oper]p6: 5148 // An operator function shall either be a non-static member 5149 // function or be a non-member function and have at least one 5150 // parameter whose type is a class, a reference to a class, an 5151 // enumeration, or a reference to an enumeration. 5152 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5153 if (MethodDecl->isStatic()) 5154 return Diag(FnDecl->getLocation(), 5155 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5156 } else { 5157 bool ClassOrEnumParam = false; 5158 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5159 ParamEnd = FnDecl->param_end(); 5160 Param != ParamEnd; ++Param) { 5161 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5162 if (ParamType->isDependentType() || ParamType->isRecordType() || 5163 ParamType->isEnumeralType()) { 5164 ClassOrEnumParam = true; 5165 break; 5166 } 5167 } 5168 5169 if (!ClassOrEnumParam) 5170 return Diag(FnDecl->getLocation(), 5171 diag::err_operator_overload_needs_class_or_enum) 5172 << FnDecl->getDeclName(); 5173 } 5174 5175 // C++ [over.oper]p8: 5176 // An operator function cannot have default arguments (8.3.6), 5177 // except where explicitly stated below. 5178 // 5179 // Only the function-call operator allows default arguments 5180 // (C++ [over.call]p1). 5181 if (Op != OO_Call) { 5182 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5183 Param != FnDecl->param_end(); ++Param) { 5184 if ((*Param)->hasDefaultArg()) 5185 return Diag((*Param)->getLocation(), 5186 diag::err_operator_overload_default_arg) 5187 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5188 } 5189 } 5190 5191 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5192 { false, false, false } 5193#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5194 , { Unary, Binary, MemberOnly } 5195#include "clang/Basic/OperatorKinds.def" 5196 }; 5197 5198 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5199 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5200 bool MustBeMemberOperator = OperatorUses[Op][2]; 5201 5202 // C++ [over.oper]p8: 5203 // [...] Operator functions cannot have more or fewer parameters 5204 // than the number required for the corresponding operator, as 5205 // described in the rest of this subclause. 5206 unsigned NumParams = FnDecl->getNumParams() 5207 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5208 if (Op != OO_Call && 5209 ((NumParams == 1 && !CanBeUnaryOperator) || 5210 (NumParams == 2 && !CanBeBinaryOperator) || 5211 (NumParams < 1) || (NumParams > 2))) { 5212 // We have the wrong number of parameters. 5213 unsigned ErrorKind; 5214 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5215 ErrorKind = 2; // 2 -> unary or binary. 5216 } else if (CanBeUnaryOperator) { 5217 ErrorKind = 0; // 0 -> unary 5218 } else { 5219 assert(CanBeBinaryOperator && 5220 "All non-call overloaded operators are unary or binary!"); 5221 ErrorKind = 1; // 1 -> binary 5222 } 5223 5224 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5225 << FnDecl->getDeclName() << NumParams << ErrorKind; 5226 } 5227 5228 // Overloaded operators other than operator() cannot be variadic. 5229 if (Op != OO_Call && 5230 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5231 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5232 << FnDecl->getDeclName(); 5233 } 5234 5235 // Some operators must be non-static member functions. 5236 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5237 return Diag(FnDecl->getLocation(), 5238 diag::err_operator_overload_must_be_member) 5239 << FnDecl->getDeclName(); 5240 } 5241 5242 // C++ [over.inc]p1: 5243 // The user-defined function called operator++ implements the 5244 // prefix and postfix ++ operator. If this function is a member 5245 // function with no parameters, or a non-member function with one 5246 // parameter of class or enumeration type, it defines the prefix 5247 // increment operator ++ for objects of that type. If the function 5248 // is a member function with one parameter (which shall be of type 5249 // int) or a non-member function with two parameters (the second 5250 // of which shall be of type int), it defines the postfix 5251 // increment operator ++ for objects of that type. 5252 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5253 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5254 bool ParamIsInt = false; 5255 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5256 ParamIsInt = BT->getKind() == BuiltinType::Int; 5257 5258 if (!ParamIsInt) 5259 return Diag(LastParam->getLocation(), 5260 diag::err_operator_overload_post_incdec_must_be_int) 5261 << LastParam->getType() << (Op == OO_MinusMinus); 5262 } 5263 5264 // Notify the class if it got an assignment operator. 5265 if (Op == OO_Equal) { 5266 // Would have returned earlier otherwise. 5267 assert(isa<CXXMethodDecl>(FnDecl) && 5268 "Overloaded = not member, but not filtered."); 5269 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5270 Method->getParent()->addedAssignmentOperator(Context, Method); 5271 } 5272 5273 return false; 5274} 5275 5276/// CheckLiteralOperatorDeclaration - Check whether the declaration 5277/// of this literal operator function is well-formed. If so, returns 5278/// false; otherwise, emits appropriate diagnostics and returns true. 5279bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5280 DeclContext *DC = FnDecl->getDeclContext(); 5281 Decl::Kind Kind = DC->getDeclKind(); 5282 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5283 Kind != Decl::LinkageSpec) { 5284 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5285 << FnDecl->getDeclName(); 5286 return true; 5287 } 5288 5289 bool Valid = false; 5290 5291 // template <char...> type operator "" name() is the only valid template 5292 // signature, and the only valid signature with no parameters. 5293 if (FnDecl->param_size() == 0) { 5294 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5295 // Must have only one template parameter 5296 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5297 if (Params->size() == 1) { 5298 NonTypeTemplateParmDecl *PmDecl = 5299 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5300 5301 // The template parameter must be a char parameter pack. 5302 // FIXME: This test will always fail because non-type parameter packs 5303 // have not been implemented. 5304 if (PmDecl && PmDecl->isTemplateParameterPack() && 5305 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5306 Valid = true; 5307 } 5308 } 5309 } else { 5310 // Check the first parameter 5311 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5312 5313 QualType T = (*Param)->getType(); 5314 5315 // unsigned long long int, long double, and any character type are allowed 5316 // as the only parameters. 5317 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5318 Context.hasSameType(T, Context.LongDoubleTy) || 5319 Context.hasSameType(T, Context.CharTy) || 5320 Context.hasSameType(T, Context.WCharTy) || 5321 Context.hasSameType(T, Context.Char16Ty) || 5322 Context.hasSameType(T, Context.Char32Ty)) { 5323 if (++Param == FnDecl->param_end()) 5324 Valid = true; 5325 goto FinishedParams; 5326 } 5327 5328 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5329 const PointerType *PT = T->getAs<PointerType>(); 5330 if (!PT) 5331 goto FinishedParams; 5332 T = PT->getPointeeType(); 5333 if (!T.isConstQualified()) 5334 goto FinishedParams; 5335 T = T.getUnqualifiedType(); 5336 5337 // Move on to the second parameter; 5338 ++Param; 5339 5340 // If there is no second parameter, the first must be a const char * 5341 if (Param == FnDecl->param_end()) { 5342 if (Context.hasSameType(T, Context.CharTy)) 5343 Valid = true; 5344 goto FinishedParams; 5345 } 5346 5347 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5348 // are allowed as the first parameter to a two-parameter function 5349 if (!(Context.hasSameType(T, Context.CharTy) || 5350 Context.hasSameType(T, Context.WCharTy) || 5351 Context.hasSameType(T, Context.Char16Ty) || 5352 Context.hasSameType(T, Context.Char32Ty))) 5353 goto FinishedParams; 5354 5355 // The second and final parameter must be an std::size_t 5356 T = (*Param)->getType().getUnqualifiedType(); 5357 if (Context.hasSameType(T, Context.getSizeType()) && 5358 ++Param == FnDecl->param_end()) 5359 Valid = true; 5360 } 5361 5362 // FIXME: This diagnostic is absolutely terrible. 5363FinishedParams: 5364 if (!Valid) { 5365 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5366 << FnDecl->getDeclName(); 5367 return true; 5368 } 5369 5370 return false; 5371} 5372 5373/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5374/// linkage specification, including the language and (if present) 5375/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5376/// the location of the language string literal, which is provided 5377/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5378/// the '{' brace. Otherwise, this linkage specification does not 5379/// have any braces. 5380Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5381 SourceLocation ExternLoc, 5382 SourceLocation LangLoc, 5383 llvm::StringRef Lang, 5384 SourceLocation LBraceLoc) { 5385 LinkageSpecDecl::LanguageIDs Language; 5386 if (Lang == "\"C\"") 5387 Language = LinkageSpecDecl::lang_c; 5388 else if (Lang == "\"C++\"") 5389 Language = LinkageSpecDecl::lang_cxx; 5390 else { 5391 Diag(LangLoc, diag::err_bad_language); 5392 return DeclPtrTy(); 5393 } 5394 5395 // FIXME: Add all the various semantics of linkage specifications 5396 5397 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5398 LangLoc, Language, 5399 LBraceLoc.isValid()); 5400 CurContext->addDecl(D); 5401 PushDeclContext(S, D); 5402 return DeclPtrTy::make(D); 5403} 5404 5405/// ActOnFinishLinkageSpecification - Completely the definition of 5406/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5407/// valid, it's the position of the closing '}' brace in a linkage 5408/// specification that uses braces. 5409Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5410 DeclPtrTy LinkageSpec, 5411 SourceLocation RBraceLoc) { 5412 if (LinkageSpec) 5413 PopDeclContext(); 5414 return LinkageSpec; 5415} 5416 5417/// \brief Perform semantic analysis for the variable declaration that 5418/// occurs within a C++ catch clause, returning the newly-created 5419/// variable. 5420VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5421 TypeSourceInfo *TInfo, 5422 IdentifierInfo *Name, 5423 SourceLocation Loc, 5424 SourceRange Range) { 5425 bool Invalid = false; 5426 5427 // Arrays and functions decay. 5428 if (ExDeclType->isArrayType()) 5429 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5430 else if (ExDeclType->isFunctionType()) 5431 ExDeclType = Context.getPointerType(ExDeclType); 5432 5433 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5434 // The exception-declaration shall not denote a pointer or reference to an 5435 // incomplete type, other than [cv] void*. 5436 // N2844 forbids rvalue references. 5437 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5438 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5439 Invalid = true; 5440 } 5441 5442 // GCC allows catching pointers and references to incomplete types 5443 // as an extension; so do we, but we warn by default. 5444 5445 QualType BaseType = ExDeclType; 5446 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5447 unsigned DK = diag::err_catch_incomplete; 5448 bool IncompleteCatchIsInvalid = true; 5449 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5450 BaseType = Ptr->getPointeeType(); 5451 Mode = 1; 5452 DK = diag::ext_catch_incomplete_ptr; 5453 IncompleteCatchIsInvalid = false; 5454 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5455 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5456 BaseType = Ref->getPointeeType(); 5457 Mode = 2; 5458 DK = diag::ext_catch_incomplete_ref; 5459 IncompleteCatchIsInvalid = false; 5460 } 5461 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5462 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5463 IncompleteCatchIsInvalid) 5464 Invalid = true; 5465 5466 if (!Invalid && !ExDeclType->isDependentType() && 5467 RequireNonAbstractType(Loc, ExDeclType, 5468 diag::err_abstract_type_in_decl, 5469 AbstractVariableType)) 5470 Invalid = true; 5471 5472 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 5473 Name, ExDeclType, TInfo, VarDecl::None, 5474 VarDecl::None); 5475 ExDecl->setExceptionVariable(true); 5476 5477 if (!Invalid) { 5478 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 5479 // C++ [except.handle]p16: 5480 // The object declared in an exception-declaration or, if the 5481 // exception-declaration does not specify a name, a temporary (12.2) is 5482 // copy-initialized (8.5) from the exception object. [...] 5483 // The object is destroyed when the handler exits, after the destruction 5484 // of any automatic objects initialized within the handler. 5485 // 5486 // We just pretend to initialize the object with itself, then make sure 5487 // it can be destroyed later. 5488 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 5489 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 5490 Loc, ExDeclType, 0); 5491 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 5492 SourceLocation()); 5493 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 5494 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5495 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 5496 if (Result.isInvalid()) 5497 Invalid = true; 5498 else 5499 FinalizeVarWithDestructor(ExDecl, RecordTy); 5500 } 5501 } 5502 5503 if (Invalid) 5504 ExDecl->setInvalidDecl(); 5505 5506 return ExDecl; 5507} 5508 5509/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 5510/// handler. 5511Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 5512 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 5513 QualType ExDeclType = TInfo->getType(); 5514 5515 bool Invalid = D.isInvalidType(); 5516 IdentifierInfo *II = D.getIdentifier(); 5517 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 5518 LookupOrdinaryName, 5519 ForRedeclaration)) { 5520 // The scope should be freshly made just for us. There is just no way 5521 // it contains any previous declaration. 5522 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 5523 if (PrevDecl->isTemplateParameter()) { 5524 // Maybe we will complain about the shadowed template parameter. 5525 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5526 } 5527 } 5528 5529 if (D.getCXXScopeSpec().isSet() && !Invalid) { 5530 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 5531 << D.getCXXScopeSpec().getRange(); 5532 Invalid = true; 5533 } 5534 5535 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 5536 D.getIdentifier(), 5537 D.getIdentifierLoc(), 5538 D.getDeclSpec().getSourceRange()); 5539 5540 if (Invalid) 5541 ExDecl->setInvalidDecl(); 5542 5543 // Add the exception declaration into this scope. 5544 if (II) 5545 PushOnScopeChains(ExDecl, S); 5546 else 5547 CurContext->addDecl(ExDecl); 5548 5549 ProcessDeclAttributes(S, ExDecl, D); 5550 return DeclPtrTy::make(ExDecl); 5551} 5552 5553Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 5554 ExprArg assertexpr, 5555 ExprArg assertmessageexpr) { 5556 Expr *AssertExpr = (Expr *)assertexpr.get(); 5557 StringLiteral *AssertMessage = 5558 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 5559 5560 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 5561 llvm::APSInt Value(32); 5562 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 5563 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 5564 AssertExpr->getSourceRange(); 5565 return DeclPtrTy(); 5566 } 5567 5568 if (Value == 0) { 5569 Diag(AssertLoc, diag::err_static_assert_failed) 5570 << AssertMessage->getString() << AssertExpr->getSourceRange(); 5571 } 5572 } 5573 5574 assertexpr.release(); 5575 assertmessageexpr.release(); 5576 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 5577 AssertExpr, AssertMessage); 5578 5579 CurContext->addDecl(Decl); 5580 return DeclPtrTy::make(Decl); 5581} 5582 5583/// \brief Perform semantic analysis of the given friend type declaration. 5584/// 5585/// \returns A friend declaration that. 5586FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 5587 TypeSourceInfo *TSInfo) { 5588 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 5589 5590 QualType T = TSInfo->getType(); 5591 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 5592 5593 if (!getLangOptions().CPlusPlus0x) { 5594 // C++03 [class.friend]p2: 5595 // An elaborated-type-specifier shall be used in a friend declaration 5596 // for a class.* 5597 // 5598 // * The class-key of the elaborated-type-specifier is required. 5599 if (!ActiveTemplateInstantiations.empty()) { 5600 // Do not complain about the form of friend template types during 5601 // template instantiation; we will already have complained when the 5602 // template was declared. 5603 } else if (!T->isElaboratedTypeSpecifier()) { 5604 // If we evaluated the type to a record type, suggest putting 5605 // a tag in front. 5606 if (const RecordType *RT = T->getAs<RecordType>()) { 5607 RecordDecl *RD = RT->getDecl(); 5608 5609 std::string InsertionText = std::string(" ") + RD->getKindName(); 5610 5611 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 5612 << (unsigned) RD->getTagKind() 5613 << T 5614 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 5615 InsertionText); 5616 } else { 5617 Diag(FriendLoc, diag::ext_nonclass_type_friend) 5618 << T 5619 << SourceRange(FriendLoc, TypeRange.getEnd()); 5620 } 5621 } else if (T->getAs<EnumType>()) { 5622 Diag(FriendLoc, diag::ext_enum_friend) 5623 << T 5624 << SourceRange(FriendLoc, TypeRange.getEnd()); 5625 } 5626 } 5627 5628 // C++0x [class.friend]p3: 5629 // If the type specifier in a friend declaration designates a (possibly 5630 // cv-qualified) class type, that class is declared as a friend; otherwise, 5631 // the friend declaration is ignored. 5632 5633 // FIXME: C++0x has some syntactic restrictions on friend type declarations 5634 // in [class.friend]p3 that we do not implement. 5635 5636 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 5637} 5638 5639/// Handle a friend type declaration. This works in tandem with 5640/// ActOnTag. 5641/// 5642/// Notes on friend class templates: 5643/// 5644/// We generally treat friend class declarations as if they were 5645/// declaring a class. So, for example, the elaborated type specifier 5646/// in a friend declaration is required to obey the restrictions of a 5647/// class-head (i.e. no typedefs in the scope chain), template 5648/// parameters are required to match up with simple template-ids, &c. 5649/// However, unlike when declaring a template specialization, it's 5650/// okay to refer to a template specialization without an empty 5651/// template parameter declaration, e.g. 5652/// friend class A<T>::B<unsigned>; 5653/// We permit this as a special case; if there are any template 5654/// parameters present at all, require proper matching, i.e. 5655/// template <> template <class T> friend class A<int>::B; 5656Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 5657 MultiTemplateParamsArg TempParams) { 5658 SourceLocation Loc = DS.getSourceRange().getBegin(); 5659 5660 assert(DS.isFriendSpecified()); 5661 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5662 5663 // Try to convert the decl specifier to a type. This works for 5664 // friend templates because ActOnTag never produces a ClassTemplateDecl 5665 // for a TUK_Friend. 5666 Declarator TheDeclarator(DS, Declarator::MemberContext); 5667 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 5668 QualType T = TSI->getType(); 5669 if (TheDeclarator.isInvalidType()) 5670 return DeclPtrTy(); 5671 5672 // This is definitely an error in C++98. It's probably meant to 5673 // be forbidden in C++0x, too, but the specification is just 5674 // poorly written. 5675 // 5676 // The problem is with declarations like the following: 5677 // template <T> friend A<T>::foo; 5678 // where deciding whether a class C is a friend or not now hinges 5679 // on whether there exists an instantiation of A that causes 5680 // 'foo' to equal C. There are restrictions on class-heads 5681 // (which we declare (by fiat) elaborated friend declarations to 5682 // be) that makes this tractable. 5683 // 5684 // FIXME: handle "template <> friend class A<T>;", which 5685 // is possibly well-formed? Who even knows? 5686 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 5687 Diag(Loc, diag::err_tagless_friend_type_template) 5688 << DS.getSourceRange(); 5689 return DeclPtrTy(); 5690 } 5691 5692 // C++98 [class.friend]p1: A friend of a class is a function 5693 // or class that is not a member of the class . . . 5694 // This is fixed in DR77, which just barely didn't make the C++03 5695 // deadline. It's also a very silly restriction that seriously 5696 // affects inner classes and which nobody else seems to implement; 5697 // thus we never diagnose it, not even in -pedantic. 5698 // 5699 // But note that we could warn about it: it's always useless to 5700 // friend one of your own members (it's not, however, worthless to 5701 // friend a member of an arbitrary specialization of your template). 5702 5703 Decl *D; 5704 if (unsigned NumTempParamLists = TempParams.size()) 5705 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 5706 NumTempParamLists, 5707 (TemplateParameterList**) TempParams.release(), 5708 TSI, 5709 DS.getFriendSpecLoc()); 5710 else 5711 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 5712 5713 if (!D) 5714 return DeclPtrTy(); 5715 5716 D->setAccess(AS_public); 5717 CurContext->addDecl(D); 5718 5719 return DeclPtrTy::make(D); 5720} 5721 5722Sema::DeclPtrTy 5723Sema::ActOnFriendFunctionDecl(Scope *S, 5724 Declarator &D, 5725 bool IsDefinition, 5726 MultiTemplateParamsArg TemplateParams) { 5727 const DeclSpec &DS = D.getDeclSpec(); 5728 5729 assert(DS.isFriendSpecified()); 5730 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 5731 5732 SourceLocation Loc = D.getIdentifierLoc(); 5733 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 5734 QualType T = TInfo->getType(); 5735 5736 // C++ [class.friend]p1 5737 // A friend of a class is a function or class.... 5738 // Note that this sees through typedefs, which is intended. 5739 // It *doesn't* see through dependent types, which is correct 5740 // according to [temp.arg.type]p3: 5741 // If a declaration acquires a function type through a 5742 // type dependent on a template-parameter and this causes 5743 // a declaration that does not use the syntactic form of a 5744 // function declarator to have a function type, the program 5745 // is ill-formed. 5746 if (!T->isFunctionType()) { 5747 Diag(Loc, diag::err_unexpected_friend); 5748 5749 // It might be worthwhile to try to recover by creating an 5750 // appropriate declaration. 5751 return DeclPtrTy(); 5752 } 5753 5754 // C++ [namespace.memdef]p3 5755 // - If a friend declaration in a non-local class first declares a 5756 // class or function, the friend class or function is a member 5757 // of the innermost enclosing namespace. 5758 // - The name of the friend is not found by simple name lookup 5759 // until a matching declaration is provided in that namespace 5760 // scope (either before or after the class declaration granting 5761 // friendship). 5762 // - If a friend function is called, its name may be found by the 5763 // name lookup that considers functions from namespaces and 5764 // classes associated with the types of the function arguments. 5765 // - When looking for a prior declaration of a class or a function 5766 // declared as a friend, scopes outside the innermost enclosing 5767 // namespace scope are not considered. 5768 5769 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 5770 DeclarationName Name = GetNameForDeclarator(D); 5771 assert(Name); 5772 5773 // The context we found the declaration in, or in which we should 5774 // create the declaration. 5775 DeclContext *DC; 5776 5777 // FIXME: handle local classes 5778 5779 // Recover from invalid scope qualifiers as if they just weren't there. 5780 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 5781 ForRedeclaration); 5782 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 5783 DC = computeDeclContext(ScopeQual); 5784 5785 // FIXME: handle dependent contexts 5786 if (!DC) return DeclPtrTy(); 5787 if (RequireCompleteDeclContext(ScopeQual, DC)) return DeclPtrTy(); 5788 5789 LookupQualifiedName(Previous, DC); 5790 5791 // Ignore things found implicitly in the wrong scope. 5792 // TODO: better diagnostics for this case. Suggesting the right 5793 // qualified scope would be nice... 5794 LookupResult::Filter F = Previous.makeFilter(); 5795 while (F.hasNext()) { 5796 NamedDecl *D = F.next(); 5797 if (!D->getDeclContext()->getLookupContext()->Equals(DC)) 5798 F.erase(); 5799 } 5800 F.done(); 5801 5802 if (Previous.empty()) { 5803 D.setInvalidType(); 5804 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 5805 return DeclPtrTy(); 5806 } 5807 5808 // C++ [class.friend]p1: A friend of a class is a function or 5809 // class that is not a member of the class . . . 5810 if (DC->Equals(CurContext)) 5811 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5812 5813 // Otherwise walk out to the nearest namespace scope looking for matches. 5814 } else { 5815 // TODO: handle local class contexts. 5816 5817 DC = CurContext; 5818 while (true) { 5819 // Skip class contexts. If someone can cite chapter and verse 5820 // for this behavior, that would be nice --- it's what GCC and 5821 // EDG do, and it seems like a reasonable intent, but the spec 5822 // really only says that checks for unqualified existing 5823 // declarations should stop at the nearest enclosing namespace, 5824 // not that they should only consider the nearest enclosing 5825 // namespace. 5826 while (DC->isRecord()) 5827 DC = DC->getParent(); 5828 5829 LookupQualifiedName(Previous, DC); 5830 5831 // TODO: decide what we think about using declarations. 5832 if (!Previous.empty()) 5833 break; 5834 5835 if (DC->isFileContext()) break; 5836 DC = DC->getParent(); 5837 } 5838 5839 // C++ [class.friend]p1: A friend of a class is a function or 5840 // class that is not a member of the class . . . 5841 // C++0x changes this for both friend types and functions. 5842 // Most C++ 98 compilers do seem to give an error here, so 5843 // we do, too. 5844 if (!Previous.empty() && DC->Equals(CurContext) 5845 && !getLangOptions().CPlusPlus0x) 5846 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 5847 } 5848 5849 if (DC->isFileContext()) { 5850 // This implies that it has to be an operator or function. 5851 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 5852 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 5853 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 5854 Diag(Loc, diag::err_introducing_special_friend) << 5855 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 5856 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 5857 return DeclPtrTy(); 5858 } 5859 } 5860 5861 bool Redeclaration = false; 5862 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 5863 move(TemplateParams), 5864 IsDefinition, 5865 Redeclaration); 5866 if (!ND) return DeclPtrTy(); 5867 5868 assert(ND->getDeclContext() == DC); 5869 assert(ND->getLexicalDeclContext() == CurContext); 5870 5871 // Add the function declaration to the appropriate lookup tables, 5872 // adjusting the redeclarations list as necessary. We don't 5873 // want to do this yet if the friending class is dependent. 5874 // 5875 // Also update the scope-based lookup if the target context's 5876 // lookup context is in lexical scope. 5877 if (!CurContext->isDependentContext()) { 5878 DC = DC->getLookupContext(); 5879 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 5880 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5881 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 5882 } 5883 5884 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 5885 D.getIdentifierLoc(), ND, 5886 DS.getFriendSpecLoc()); 5887 FrD->setAccess(AS_public); 5888 CurContext->addDecl(FrD); 5889 5890 return DeclPtrTy::make(ND); 5891} 5892 5893void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 5894 AdjustDeclIfTemplate(dcl); 5895 5896 Decl *Dcl = dcl.getAs<Decl>(); 5897 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 5898 if (!Fn) { 5899 Diag(DelLoc, diag::err_deleted_non_function); 5900 return; 5901 } 5902 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 5903 Diag(DelLoc, diag::err_deleted_decl_not_first); 5904 Diag(Prev->getLocation(), diag::note_previous_declaration); 5905 // If the declaration wasn't the first, we delete the function anyway for 5906 // recovery. 5907 } 5908 Fn->setDeleted(); 5909} 5910 5911static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 5912 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 5913 ++CI) { 5914 Stmt *SubStmt = *CI; 5915 if (!SubStmt) 5916 continue; 5917 if (isa<ReturnStmt>(SubStmt)) 5918 Self.Diag(SubStmt->getSourceRange().getBegin(), 5919 diag::err_return_in_constructor_handler); 5920 if (!isa<Expr>(SubStmt)) 5921 SearchForReturnInStmt(Self, SubStmt); 5922 } 5923} 5924 5925void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 5926 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 5927 CXXCatchStmt *Handler = TryBlock->getHandler(I); 5928 SearchForReturnInStmt(*this, Handler); 5929 } 5930} 5931 5932bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 5933 const CXXMethodDecl *Old) { 5934 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 5935 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 5936 5937 if (Context.hasSameType(NewTy, OldTy) || 5938 NewTy->isDependentType() || OldTy->isDependentType()) 5939 return false; 5940 5941 // Check if the return types are covariant 5942 QualType NewClassTy, OldClassTy; 5943 5944 /// Both types must be pointers or references to classes. 5945 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 5946 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 5947 NewClassTy = NewPT->getPointeeType(); 5948 OldClassTy = OldPT->getPointeeType(); 5949 } 5950 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 5951 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 5952 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 5953 NewClassTy = NewRT->getPointeeType(); 5954 OldClassTy = OldRT->getPointeeType(); 5955 } 5956 } 5957 } 5958 5959 // The return types aren't either both pointers or references to a class type. 5960 if (NewClassTy.isNull()) { 5961 Diag(New->getLocation(), 5962 diag::err_different_return_type_for_overriding_virtual_function) 5963 << New->getDeclName() << NewTy << OldTy; 5964 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5965 5966 return true; 5967 } 5968 5969 // C++ [class.virtual]p6: 5970 // If the return type of D::f differs from the return type of B::f, the 5971 // class type in the return type of D::f shall be complete at the point of 5972 // declaration of D::f or shall be the class type D. 5973 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 5974 if (!RT->isBeingDefined() && 5975 RequireCompleteType(New->getLocation(), NewClassTy, 5976 PDiag(diag::err_covariant_return_incomplete) 5977 << New->getDeclName())) 5978 return true; 5979 } 5980 5981 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 5982 // Check if the new class derives from the old class. 5983 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 5984 Diag(New->getLocation(), 5985 diag::err_covariant_return_not_derived) 5986 << New->getDeclName() << NewTy << OldTy; 5987 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5988 return true; 5989 } 5990 5991 // Check if we the conversion from derived to base is valid. 5992 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 5993 diag::err_covariant_return_inaccessible_base, 5994 diag::err_covariant_return_ambiguous_derived_to_base_conv, 5995 // FIXME: Should this point to the return type? 5996 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 5997 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 5998 return true; 5999 } 6000 } 6001 6002 // The qualifiers of the return types must be the same. 6003 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6004 Diag(New->getLocation(), 6005 diag::err_covariant_return_type_different_qualifications) 6006 << New->getDeclName() << NewTy << OldTy; 6007 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6008 return true; 6009 }; 6010 6011 6012 // The new class type must have the same or less qualifiers as the old type. 6013 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6014 Diag(New->getLocation(), 6015 diag::err_covariant_return_type_class_type_more_qualified) 6016 << New->getDeclName() << NewTy << OldTy; 6017 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6018 return true; 6019 }; 6020 6021 return false; 6022} 6023 6024bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6025 const CXXMethodDecl *Old) 6026{ 6027 if (Old->hasAttr<FinalAttr>()) { 6028 Diag(New->getLocation(), diag::err_final_function_overridden) 6029 << New->getDeclName(); 6030 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6031 return true; 6032 } 6033 6034 return false; 6035} 6036 6037/// \brief Mark the given method pure. 6038/// 6039/// \param Method the method to be marked pure. 6040/// 6041/// \param InitRange the source range that covers the "0" initializer. 6042bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6043 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6044 Method->setPure(); 6045 6046 // A class is abstract if at least one function is pure virtual. 6047 Method->getParent()->setAbstract(true); 6048 return false; 6049 } 6050 6051 if (!Method->isInvalidDecl()) 6052 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6053 << Method->getDeclName() << InitRange; 6054 return true; 6055} 6056 6057/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6058/// an initializer for the out-of-line declaration 'Dcl'. The scope 6059/// is a fresh scope pushed for just this purpose. 6060/// 6061/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6062/// static data member of class X, names should be looked up in the scope of 6063/// class X. 6064void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6065 // If there is no declaration, there was an error parsing it. 6066 Decl *D = Dcl.getAs<Decl>(); 6067 if (D == 0) return; 6068 6069 // We should only get called for declarations with scope specifiers, like: 6070 // int foo::bar; 6071 assert(D->isOutOfLine()); 6072 EnterDeclaratorContext(S, D->getDeclContext()); 6073} 6074 6075/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6076/// initializer for the out-of-line declaration 'Dcl'. 6077void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6078 // If there is no declaration, there was an error parsing it. 6079 Decl *D = Dcl.getAs<Decl>(); 6080 if (D == 0) return; 6081 6082 assert(D->isOutOfLine()); 6083 ExitDeclaratorContext(S); 6084} 6085 6086/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6087/// C++ if/switch/while/for statement. 6088/// e.g: "if (int x = f()) {...}" 6089Action::DeclResult 6090Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6091 // C++ 6.4p2: 6092 // The declarator shall not specify a function or an array. 6093 // The type-specifier-seq shall not contain typedef and shall not declare a 6094 // new class or enumeration. 6095 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6096 "Parser allowed 'typedef' as storage class of condition decl."); 6097 6098 TagDecl *OwnedTag = 0; 6099 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6100 QualType Ty = TInfo->getType(); 6101 6102 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6103 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6104 // would be created and CXXConditionDeclExpr wants a VarDecl. 6105 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6106 << D.getSourceRange(); 6107 return DeclResult(); 6108 } else if (OwnedTag && OwnedTag->isDefinition()) { 6109 // The type-specifier-seq shall not declare a new class or enumeration. 6110 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6111 } 6112 6113 DeclPtrTy Dcl = ActOnDeclarator(S, D); 6114 if (!Dcl) 6115 return DeclResult(); 6116 6117 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 6118 VD->setDeclaredInCondition(true); 6119 return Dcl; 6120} 6121 6122void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6123 bool DefinitionRequired) { 6124 // Ignore any vtable uses in unevaluated operands or for classes that do 6125 // not have a vtable. 6126 if (!Class->isDynamicClass() || Class->isDependentContext() || 6127 CurContext->isDependentContext() || 6128 ExprEvalContexts.back().Context == Unevaluated) 6129 return; 6130 6131 // Try to insert this class into the map. 6132 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6133 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6134 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6135 if (!Pos.second) { 6136 // If we already had an entry, check to see if we are promoting this vtable 6137 // to required a definition. If so, we need to reappend to the VTableUses 6138 // list, since we may have already processed the first entry. 6139 if (DefinitionRequired && !Pos.first->second) { 6140 Pos.first->second = true; 6141 } else { 6142 // Otherwise, we can early exit. 6143 return; 6144 } 6145 } 6146 6147 // Local classes need to have their virtual members marked 6148 // immediately. For all other classes, we mark their virtual members 6149 // at the end of the translation unit. 6150 if (Class->isLocalClass()) 6151 MarkVirtualMembersReferenced(Loc, Class); 6152 else 6153 VTableUses.push_back(std::make_pair(Class, Loc)); 6154} 6155 6156bool Sema::DefineUsedVTables() { 6157 // If any dynamic classes have their key function defined within 6158 // this translation unit, then those vtables are considered "used" and must 6159 // be emitted. 6160 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6161 if (const CXXMethodDecl *KeyFunction 6162 = Context.getKeyFunction(DynamicClasses[I])) { 6163 const FunctionDecl *Definition = 0; 6164 if (KeyFunction->getBody(Definition)) 6165 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6166 } 6167 } 6168 6169 if (VTableUses.empty()) 6170 return false; 6171 6172 // Note: The VTableUses vector could grow as a result of marking 6173 // the members of a class as "used", so we check the size each 6174 // time through the loop and prefer indices (with are stable) to 6175 // iterators (which are not). 6176 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6177 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6178 if (!Class) 6179 continue; 6180 6181 SourceLocation Loc = VTableUses[I].second; 6182 6183 // If this class has a key function, but that key function is 6184 // defined in another translation unit, we don't need to emit the 6185 // vtable even though we're using it. 6186 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6187 if (KeyFunction && !KeyFunction->getBody()) { 6188 switch (KeyFunction->getTemplateSpecializationKind()) { 6189 case TSK_Undeclared: 6190 case TSK_ExplicitSpecialization: 6191 case TSK_ExplicitInstantiationDeclaration: 6192 // The key function is in another translation unit. 6193 continue; 6194 6195 case TSK_ExplicitInstantiationDefinition: 6196 case TSK_ImplicitInstantiation: 6197 // We will be instantiating the key function. 6198 break; 6199 } 6200 } else if (!KeyFunction) { 6201 // If we have a class with no key function that is the subject 6202 // of an explicit instantiation declaration, suppress the 6203 // vtable; it will live with the explicit instantiation 6204 // definition. 6205 bool IsExplicitInstantiationDeclaration 6206 = Class->getTemplateSpecializationKind() 6207 == TSK_ExplicitInstantiationDeclaration; 6208 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6209 REnd = Class->redecls_end(); 6210 R != REnd; ++R) { 6211 TemplateSpecializationKind TSK 6212 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6213 if (TSK == TSK_ExplicitInstantiationDeclaration) 6214 IsExplicitInstantiationDeclaration = true; 6215 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6216 IsExplicitInstantiationDeclaration = false; 6217 break; 6218 } 6219 } 6220 6221 if (IsExplicitInstantiationDeclaration) 6222 continue; 6223 } 6224 6225 // Mark all of the virtual members of this class as referenced, so 6226 // that we can build a vtable. Then, tell the AST consumer that a 6227 // vtable for this class is required. 6228 MarkVirtualMembersReferenced(Loc, Class); 6229 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6230 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6231 6232 // Optionally warn if we're emitting a weak vtable. 6233 if (Class->getLinkage() == ExternalLinkage && 6234 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6235 if (!KeyFunction || (KeyFunction->getBody() && KeyFunction->isInlined())) 6236 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6237 } 6238 } 6239 VTableUses.clear(); 6240 6241 return true; 6242} 6243 6244void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6245 const CXXRecordDecl *RD) { 6246 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6247 e = RD->method_end(); i != e; ++i) { 6248 CXXMethodDecl *MD = *i; 6249 6250 // C++ [basic.def.odr]p2: 6251 // [...] A virtual member function is used if it is not pure. [...] 6252 if (MD->isVirtual() && !MD->isPure()) 6253 MarkDeclarationReferenced(Loc, MD); 6254 } 6255 6256 // Only classes that have virtual bases need a VTT. 6257 if (RD->getNumVBases() == 0) 6258 return; 6259 6260 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6261 e = RD->bases_end(); i != e; ++i) { 6262 const CXXRecordDecl *Base = 6263 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6264 if (i->isVirtual()) 6265 continue; 6266 if (Base->getNumVBases() == 0) 6267 continue; 6268 MarkVirtualMembersReferenced(Loc, Base); 6269 } 6270} 6271 6272/// SetIvarInitializers - This routine builds initialization ASTs for the 6273/// Objective-C implementation whose ivars need be initialized. 6274void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6275 if (!getLangOptions().CPlusPlus) 6276 return; 6277 if (const ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6278 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6279 CollectIvarsToConstructOrDestruct(OID, ivars); 6280 if (ivars.empty()) 6281 return; 6282 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6283 for (unsigned i = 0; i < ivars.size(); i++) { 6284 FieldDecl *Field = ivars[i]; 6285 if (Field->isInvalidDecl()) 6286 continue; 6287 6288 CXXBaseOrMemberInitializer *Member; 6289 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6290 InitializationKind InitKind = 6291 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6292 6293 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6294 Sema::OwningExprResult MemberInit = 6295 InitSeq.Perform(*this, InitEntity, InitKind, 6296 Sema::MultiExprArg(*this, 0, 0)); 6297 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 6298 // Note, MemberInit could actually come back empty if no initialization 6299 // is required (e.g., because it would call a trivial default constructor) 6300 if (!MemberInit.get() || MemberInit.isInvalid()) 6301 continue; 6302 6303 Member = 6304 new (Context) CXXBaseOrMemberInitializer(Context, 6305 Field, SourceLocation(), 6306 SourceLocation(), 6307 MemberInit.takeAs<Expr>(), 6308 SourceLocation()); 6309 AllToInit.push_back(Member); 6310 6311 // Be sure that the destructor is accessible and is marked as referenced. 6312 if (const RecordType *RecordTy 6313 = Context.getBaseElementType(Field->getType()) 6314 ->getAs<RecordType>()) { 6315 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6316 if (CXXDestructorDecl *Destructor 6317 = const_cast<CXXDestructorDecl*>(RD->getDestructor(Context))) { 6318 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6319 CheckDestructorAccess(Field->getLocation(), Destructor, 6320 PDiag(diag::err_access_dtor_ivar) 6321 << Context.getBaseElementType(Field->getType())); 6322 } 6323 } 6324 } 6325 ObjCImplementation->setIvarInitializers(Context, 6326 AllToInit.data(), AllToInit.size()); 6327 } 6328} 6329