SemaDeclCXX.cpp revision 26faaac4b636eafc2d686516f068170652c83fd9
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/CharUnits.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/RecordLayout.h" 23#include "clang/AST/StmtVisitor.h" 24#include "clang/AST/TypeLoc.h" 25#include "clang/AST/TypeOrdering.h" 26#include "clang/Parse/DeclSpec.h" 27#include "clang/Parse/Template.h" 28#include "clang/Basic/PartialDiagnostic.h" 29#include "clang/Lex/Preprocessor.h" 30#include "llvm/ADT/STLExtras.h" 31#include <map> 32#include <set> 33 34using namespace clang; 35 36//===----------------------------------------------------------------------===// 37// CheckDefaultArgumentVisitor 38//===----------------------------------------------------------------------===// 39 40namespace { 41 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 42 /// the default argument of a parameter to determine whether it 43 /// contains any ill-formed subexpressions. For example, this will 44 /// diagnose the use of local variables or parameters within the 45 /// default argument expression. 46 class CheckDefaultArgumentVisitor 47 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 48 Expr *DefaultArg; 49 Sema *S; 50 51 public: 52 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 53 : DefaultArg(defarg), S(s) {} 54 55 bool VisitExpr(Expr *Node); 56 bool VisitDeclRefExpr(DeclRefExpr *DRE); 57 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 58 }; 59 60 /// VisitExpr - Visit all of the children of this expression. 61 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 62 bool IsInvalid = false; 63 for (Stmt::child_iterator I = Node->child_begin(), 64 E = Node->child_end(); I != E; ++I) 65 IsInvalid |= Visit(*I); 66 return IsInvalid; 67 } 68 69 /// VisitDeclRefExpr - Visit a reference to a declaration, to 70 /// determine whether this declaration can be used in the default 71 /// argument expression. 72 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 73 NamedDecl *Decl = DRE->getDecl(); 74 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 75 // C++ [dcl.fct.default]p9 76 // Default arguments are evaluated each time the function is 77 // called. The order of evaluation of function arguments is 78 // unspecified. Consequently, parameters of a function shall not 79 // be used in default argument expressions, even if they are not 80 // evaluated. Parameters of a function declared before a default 81 // argument expression are in scope and can hide namespace and 82 // class member names. 83 return S->Diag(DRE->getSourceRange().getBegin(), 84 diag::err_param_default_argument_references_param) 85 << Param->getDeclName() << DefaultArg->getSourceRange(); 86 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 87 // C++ [dcl.fct.default]p7 88 // Local variables shall not be used in default argument 89 // expressions. 90 if (VDecl->isBlockVarDecl()) 91 return S->Diag(DRE->getSourceRange().getBegin(), 92 diag::err_param_default_argument_references_local) 93 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 94 } 95 96 return false; 97 } 98 99 /// VisitCXXThisExpr - Visit a C++ "this" expression. 100 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 101 // C++ [dcl.fct.default]p8: 102 // The keyword this shall not be used in a default argument of a 103 // member function. 104 return S->Diag(ThisE->getSourceRange().getBegin(), 105 diag::err_param_default_argument_references_this) 106 << ThisE->getSourceRange(); 107 } 108} 109 110bool 111Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 112 SourceLocation EqualLoc) { 113 if (RequireCompleteType(Param->getLocation(), Param->getType(), 114 diag::err_typecheck_decl_incomplete_type)) { 115 Param->setInvalidDecl(); 116 return true; 117 } 118 119 Expr *Arg = (Expr *)DefaultArg.get(); 120 121 // C++ [dcl.fct.default]p5 122 // A default argument expression is implicitly converted (clause 123 // 4) to the parameter type. The default argument expression has 124 // the same semantic constraints as the initializer expression in 125 // a declaration of a variable of the parameter type, using the 126 // copy-initialization semantics (8.5). 127 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 128 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 129 EqualLoc); 130 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 131 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 132 MultiExprArg(*this, (void**)&Arg, 1)); 133 if (Result.isInvalid()) 134 return true; 135 Arg = Result.takeAs<Expr>(); 136 137 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 138 139 // Okay: add the default argument to the parameter 140 Param->setDefaultArg(Arg); 141 142 DefaultArg.release(); 143 144 return false; 145} 146 147/// ActOnParamDefaultArgument - Check whether the default argument 148/// provided for a function parameter is well-formed. If so, attach it 149/// to the parameter declaration. 150void 151Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 152 ExprArg defarg) { 153 if (!param || !defarg.get()) 154 return; 155 156 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 157 UnparsedDefaultArgLocs.erase(Param); 158 159 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 160 161 // Default arguments are only permitted in C++ 162 if (!getLangOptions().CPlusPlus) { 163 Diag(EqualLoc, diag::err_param_default_argument) 164 << DefaultArg->getSourceRange(); 165 Param->setInvalidDecl(); 166 return; 167 } 168 169 // Check that the default argument is well-formed 170 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 171 if (DefaultArgChecker.Visit(DefaultArg.get())) { 172 Param->setInvalidDecl(); 173 return; 174 } 175 176 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 177} 178 179/// ActOnParamUnparsedDefaultArgument - We've seen a default 180/// argument for a function parameter, but we can't parse it yet 181/// because we're inside a class definition. Note that this default 182/// argument will be parsed later. 183void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 184 SourceLocation EqualLoc, 185 SourceLocation ArgLoc) { 186 if (!param) 187 return; 188 189 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 190 if (Param) 191 Param->setUnparsedDefaultArg(); 192 193 UnparsedDefaultArgLocs[Param] = ArgLoc; 194} 195 196/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 197/// the default argument for the parameter param failed. 198void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 199 if (!param) 200 return; 201 202 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 203 204 Param->setInvalidDecl(); 205 206 UnparsedDefaultArgLocs.erase(Param); 207} 208 209/// CheckExtraCXXDefaultArguments - Check for any extra default 210/// arguments in the declarator, which is not a function declaration 211/// or definition and therefore is not permitted to have default 212/// arguments. This routine should be invoked for every declarator 213/// that is not a function declaration or definition. 214void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 215 // C++ [dcl.fct.default]p3 216 // A default argument expression shall be specified only in the 217 // parameter-declaration-clause of a function declaration or in a 218 // template-parameter (14.1). It shall not be specified for a 219 // parameter pack. If it is specified in a 220 // parameter-declaration-clause, it shall not occur within a 221 // declarator or abstract-declarator of a parameter-declaration. 222 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 223 DeclaratorChunk &chunk = D.getTypeObject(i); 224 if (chunk.Kind == DeclaratorChunk::Function) { 225 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 226 ParmVarDecl *Param = 227 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 228 if (Param->hasUnparsedDefaultArg()) { 229 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 230 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 231 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 232 delete Toks; 233 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 234 } else if (Param->getDefaultArg()) { 235 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 236 << Param->getDefaultArg()->getSourceRange(); 237 Param->setDefaultArg(0); 238 } 239 } 240 } 241 } 242} 243 244// MergeCXXFunctionDecl - Merge two declarations of the same C++ 245// function, once we already know that they have the same 246// type. Subroutine of MergeFunctionDecl. Returns true if there was an 247// error, false otherwise. 248bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 249 bool Invalid = false; 250 251 // C++ [dcl.fct.default]p4: 252 // For non-template functions, default arguments can be added in 253 // later declarations of a function in the same 254 // scope. Declarations in different scopes have completely 255 // distinct sets of default arguments. That is, declarations in 256 // inner scopes do not acquire default arguments from 257 // declarations in outer scopes, and vice versa. In a given 258 // function declaration, all parameters subsequent to a 259 // parameter with a default argument shall have default 260 // arguments supplied in this or previous declarations. A 261 // default argument shall not be redefined by a later 262 // declaration (not even to the same value). 263 // 264 // C++ [dcl.fct.default]p6: 265 // Except for member functions of class templates, the default arguments 266 // in a member function definition that appears outside of the class 267 // definition are added to the set of default arguments provided by the 268 // member function declaration in the class definition. 269 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 270 ParmVarDecl *OldParam = Old->getParamDecl(p); 271 ParmVarDecl *NewParam = New->getParamDecl(p); 272 273 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 274 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 275 // hint here. Alternatively, we could walk the type-source information 276 // for NewParam to find the last source location in the type... but it 277 // isn't worth the effort right now. This is the kind of test case that 278 // is hard to get right: 279 280 // int f(int); 281 // void g(int (*fp)(int) = f); 282 // void g(int (*fp)(int) = &f); 283 Diag(NewParam->getLocation(), 284 diag::err_param_default_argument_redefinition) 285 << NewParam->getDefaultArgRange(); 286 287 // Look for the function declaration where the default argument was 288 // actually written, which may be a declaration prior to Old. 289 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 290 Older; Older = Older->getPreviousDeclaration()) { 291 if (!Older->getParamDecl(p)->hasDefaultArg()) 292 break; 293 294 OldParam = Older->getParamDecl(p); 295 } 296 297 Diag(OldParam->getLocation(), diag::note_previous_definition) 298 << OldParam->getDefaultArgRange(); 299 Invalid = true; 300 } else if (OldParam->hasDefaultArg()) { 301 // Merge the old default argument into the new parameter. 302 // It's important to use getInit() here; getDefaultArg() 303 // strips off any top-level CXXExprWithTemporaries. 304 NewParam->setHasInheritedDefaultArg(); 305 if (OldParam->hasUninstantiatedDefaultArg()) 306 NewParam->setUninstantiatedDefaultArg( 307 OldParam->getUninstantiatedDefaultArg()); 308 else 309 NewParam->setDefaultArg(OldParam->getInit()); 310 } else if (NewParam->hasDefaultArg()) { 311 if (New->getDescribedFunctionTemplate()) { 312 // Paragraph 4, quoted above, only applies to non-template functions. 313 Diag(NewParam->getLocation(), 314 diag::err_param_default_argument_template_redecl) 315 << NewParam->getDefaultArgRange(); 316 Diag(Old->getLocation(), diag::note_template_prev_declaration) 317 << false; 318 } else if (New->getTemplateSpecializationKind() 319 != TSK_ImplicitInstantiation && 320 New->getTemplateSpecializationKind() != TSK_Undeclared) { 321 // C++ [temp.expr.spec]p21: 322 // Default function arguments shall not be specified in a declaration 323 // or a definition for one of the following explicit specializations: 324 // - the explicit specialization of a function template; 325 // - the explicit specialization of a member function template; 326 // - the explicit specialization of a member function of a class 327 // template where the class template specialization to which the 328 // member function specialization belongs is implicitly 329 // instantiated. 330 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 331 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 332 << New->getDeclName() 333 << NewParam->getDefaultArgRange(); 334 } else if (New->getDeclContext()->isDependentContext()) { 335 // C++ [dcl.fct.default]p6 (DR217): 336 // Default arguments for a member function of a class template shall 337 // be specified on the initial declaration of the member function 338 // within the class template. 339 // 340 // Reading the tea leaves a bit in DR217 and its reference to DR205 341 // leads me to the conclusion that one cannot add default function 342 // arguments for an out-of-line definition of a member function of a 343 // dependent type. 344 int WhichKind = 2; 345 if (CXXRecordDecl *Record 346 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 347 if (Record->getDescribedClassTemplate()) 348 WhichKind = 0; 349 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 350 WhichKind = 1; 351 else 352 WhichKind = 2; 353 } 354 355 Diag(NewParam->getLocation(), 356 diag::err_param_default_argument_member_template_redecl) 357 << WhichKind 358 << NewParam->getDefaultArgRange(); 359 } 360 } 361 } 362 363 if (CheckEquivalentExceptionSpec(Old, New)) 364 Invalid = true; 365 366 return Invalid; 367} 368 369/// CheckCXXDefaultArguments - Verify that the default arguments for a 370/// function declaration are well-formed according to C++ 371/// [dcl.fct.default]. 372void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 373 unsigned NumParams = FD->getNumParams(); 374 unsigned p; 375 376 // Find first parameter with a default argument 377 for (p = 0; p < NumParams; ++p) { 378 ParmVarDecl *Param = FD->getParamDecl(p); 379 if (Param->hasDefaultArg()) 380 break; 381 } 382 383 // C++ [dcl.fct.default]p4: 384 // In a given function declaration, all parameters 385 // subsequent to a parameter with a default argument shall 386 // have default arguments supplied in this or previous 387 // declarations. A default argument shall not be redefined 388 // by a later declaration (not even to the same value). 389 unsigned LastMissingDefaultArg = 0; 390 for (; p < NumParams; ++p) { 391 ParmVarDecl *Param = FD->getParamDecl(p); 392 if (!Param->hasDefaultArg()) { 393 if (Param->isInvalidDecl()) 394 /* We already complained about this parameter. */; 395 else if (Param->getIdentifier()) 396 Diag(Param->getLocation(), 397 diag::err_param_default_argument_missing_name) 398 << Param->getIdentifier(); 399 else 400 Diag(Param->getLocation(), 401 diag::err_param_default_argument_missing); 402 403 LastMissingDefaultArg = p; 404 } 405 } 406 407 if (LastMissingDefaultArg > 0) { 408 // Some default arguments were missing. Clear out all of the 409 // default arguments up to (and including) the last missing 410 // default argument, so that we leave the function parameters 411 // in a semantically valid state. 412 for (p = 0; p <= LastMissingDefaultArg; ++p) { 413 ParmVarDecl *Param = FD->getParamDecl(p); 414 if (Param->hasDefaultArg()) { 415 Param->setDefaultArg(0); 416 } 417 } 418 } 419} 420 421/// isCurrentClassName - Determine whether the identifier II is the 422/// name of the class type currently being defined. In the case of 423/// nested classes, this will only return true if II is the name of 424/// the innermost class. 425bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 426 const CXXScopeSpec *SS) { 427 assert(getLangOptions().CPlusPlus && "No class names in C!"); 428 429 CXXRecordDecl *CurDecl; 430 if (SS && SS->isSet() && !SS->isInvalid()) { 431 DeclContext *DC = computeDeclContext(*SS, true); 432 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 433 } else 434 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 435 436 if (CurDecl && CurDecl->getIdentifier()) 437 return &II == CurDecl->getIdentifier(); 438 else 439 return false; 440} 441 442/// \brief Check the validity of a C++ base class specifier. 443/// 444/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 445/// and returns NULL otherwise. 446CXXBaseSpecifier * 447Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 448 SourceRange SpecifierRange, 449 bool Virtual, AccessSpecifier Access, 450 TypeSourceInfo *TInfo) { 451 QualType BaseType = TInfo->getType(); 452 453 // C++ [class.union]p1: 454 // A union shall not have base classes. 455 if (Class->isUnion()) { 456 Diag(Class->getLocation(), diag::err_base_clause_on_union) 457 << SpecifierRange; 458 return 0; 459 } 460 461 if (BaseType->isDependentType()) 462 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 463 Class->getTagKind() == TTK_Class, 464 Access, TInfo); 465 466 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 467 468 // Base specifiers must be record types. 469 if (!BaseType->isRecordType()) { 470 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 471 return 0; 472 } 473 474 // C++ [class.union]p1: 475 // A union shall not be used as a base class. 476 if (BaseType->isUnionType()) { 477 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 478 return 0; 479 } 480 481 // C++ [class.derived]p2: 482 // The class-name in a base-specifier shall not be an incompletely 483 // defined class. 484 if (RequireCompleteType(BaseLoc, BaseType, 485 PDiag(diag::err_incomplete_base_class) 486 << SpecifierRange)) 487 return 0; 488 489 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 490 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 491 assert(BaseDecl && "Record type has no declaration"); 492 BaseDecl = BaseDecl->getDefinition(); 493 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 494 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 495 assert(CXXBaseDecl && "Base type is not a C++ type"); 496 497 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 498 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 499 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 500 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 501 << BaseType; 502 return 0; 503 } 504 505 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 506 507 // Create the base specifier. 508 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 509 Class->getTagKind() == TTK_Class, 510 Access, TInfo); 511} 512 513void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 514 const CXXRecordDecl *BaseClass, 515 bool BaseIsVirtual) { 516 // A class with a non-empty base class is not empty. 517 // FIXME: Standard ref? 518 if (!BaseClass->isEmpty()) 519 Class->setEmpty(false); 520 521 // C++ [class.virtual]p1: 522 // A class that [...] inherits a virtual function is called a polymorphic 523 // class. 524 if (BaseClass->isPolymorphic()) 525 Class->setPolymorphic(true); 526 527 // C++ [dcl.init.aggr]p1: 528 // An aggregate is [...] a class with [...] no base classes [...]. 529 Class->setAggregate(false); 530 531 // C++ [class]p4: 532 // A POD-struct is an aggregate class... 533 Class->setPOD(false); 534 535 if (BaseIsVirtual) { 536 // C++ [class.ctor]p5: 537 // A constructor is trivial if its class has no virtual base classes. 538 Class->setHasTrivialConstructor(false); 539 540 // C++ [class.copy]p6: 541 // A copy constructor is trivial if its class has no virtual base classes. 542 Class->setHasTrivialCopyConstructor(false); 543 544 // C++ [class.copy]p11: 545 // A copy assignment operator is trivial if its class has no virtual 546 // base classes. 547 Class->setHasTrivialCopyAssignment(false); 548 549 // C++0x [meta.unary.prop] is_empty: 550 // T is a class type, but not a union type, with ... no virtual base 551 // classes 552 Class->setEmpty(false); 553 } else { 554 // C++ [class.ctor]p5: 555 // A constructor is trivial if all the direct base classes of its 556 // class have trivial constructors. 557 if (!BaseClass->hasTrivialConstructor()) 558 Class->setHasTrivialConstructor(false); 559 560 // C++ [class.copy]p6: 561 // A copy constructor is trivial if all the direct base classes of its 562 // class have trivial copy constructors. 563 if (!BaseClass->hasTrivialCopyConstructor()) 564 Class->setHasTrivialCopyConstructor(false); 565 566 // C++ [class.copy]p11: 567 // A copy assignment operator is trivial if all the direct base classes 568 // of its class have trivial copy assignment operators. 569 if (!BaseClass->hasTrivialCopyAssignment()) 570 Class->setHasTrivialCopyAssignment(false); 571 } 572 573 // C++ [class.ctor]p3: 574 // A destructor is trivial if all the direct base classes of its class 575 // have trivial destructors. 576 if (!BaseClass->hasTrivialDestructor()) 577 Class->setHasTrivialDestructor(false); 578} 579 580/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 581/// one entry in the base class list of a class specifier, for 582/// example: 583/// class foo : public bar, virtual private baz { 584/// 'public bar' and 'virtual private baz' are each base-specifiers. 585Sema::BaseResult 586Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 587 bool Virtual, AccessSpecifier Access, 588 TypeTy *basetype, SourceLocation BaseLoc) { 589 if (!classdecl) 590 return true; 591 592 AdjustDeclIfTemplate(classdecl); 593 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 594 if (!Class) 595 return true; 596 597 TypeSourceInfo *TInfo = 0; 598 GetTypeFromParser(basetype, &TInfo); 599 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 600 Virtual, Access, TInfo)) 601 return BaseSpec; 602 603 return true; 604} 605 606/// \brief Performs the actual work of attaching the given base class 607/// specifiers to a C++ class. 608bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 609 unsigned NumBases) { 610 if (NumBases == 0) 611 return false; 612 613 // Used to keep track of which base types we have already seen, so 614 // that we can properly diagnose redundant direct base types. Note 615 // that the key is always the unqualified canonical type of the base 616 // class. 617 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 618 619 // Copy non-redundant base specifiers into permanent storage. 620 unsigned NumGoodBases = 0; 621 bool Invalid = false; 622 for (unsigned idx = 0; idx < NumBases; ++idx) { 623 QualType NewBaseType 624 = Context.getCanonicalType(Bases[idx]->getType()); 625 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 626 if (!Class->hasObjectMember()) { 627 if (const RecordType *FDTTy = 628 NewBaseType.getTypePtr()->getAs<RecordType>()) 629 if (FDTTy->getDecl()->hasObjectMember()) 630 Class->setHasObjectMember(true); 631 } 632 633 if (KnownBaseTypes[NewBaseType]) { 634 // C++ [class.mi]p3: 635 // A class shall not be specified as a direct base class of a 636 // derived class more than once. 637 Diag(Bases[idx]->getSourceRange().getBegin(), 638 diag::err_duplicate_base_class) 639 << KnownBaseTypes[NewBaseType]->getType() 640 << Bases[idx]->getSourceRange(); 641 642 // Delete the duplicate base class specifier; we're going to 643 // overwrite its pointer later. 644 Context.Deallocate(Bases[idx]); 645 646 Invalid = true; 647 } else { 648 // Okay, add this new base class. 649 KnownBaseTypes[NewBaseType] = Bases[idx]; 650 Bases[NumGoodBases++] = Bases[idx]; 651 } 652 } 653 654 // Attach the remaining base class specifiers to the derived class. 655 Class->setBases(Bases, NumGoodBases); 656 657 // Delete the remaining (good) base class specifiers, since their 658 // data has been copied into the CXXRecordDecl. 659 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 660 Context.Deallocate(Bases[idx]); 661 662 return Invalid; 663} 664 665/// ActOnBaseSpecifiers - Attach the given base specifiers to the 666/// class, after checking whether there are any duplicate base 667/// classes. 668void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 669 unsigned NumBases) { 670 if (!ClassDecl || !Bases || !NumBases) 671 return; 672 673 AdjustDeclIfTemplate(ClassDecl); 674 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 675 (CXXBaseSpecifier**)(Bases), NumBases); 676} 677 678static CXXRecordDecl *GetClassForType(QualType T) { 679 if (const RecordType *RT = T->getAs<RecordType>()) 680 return cast<CXXRecordDecl>(RT->getDecl()); 681 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 682 return ICT->getDecl(); 683 else 684 return 0; 685} 686 687/// \brief Determine whether the type \p Derived is a C++ class that is 688/// derived from the type \p Base. 689bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 690 if (!getLangOptions().CPlusPlus) 691 return false; 692 693 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 694 if (!DerivedRD) 695 return false; 696 697 CXXRecordDecl *BaseRD = GetClassForType(Base); 698 if (!BaseRD) 699 return false; 700 701 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 702 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 703} 704 705/// \brief Determine whether the type \p Derived is a C++ class that is 706/// derived from the type \p Base. 707bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 708 if (!getLangOptions().CPlusPlus) 709 return false; 710 711 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 712 if (!DerivedRD) 713 return false; 714 715 CXXRecordDecl *BaseRD = GetClassForType(Base); 716 if (!BaseRD) 717 return false; 718 719 return DerivedRD->isDerivedFrom(BaseRD, Paths); 720} 721 722void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 723 CXXBaseSpecifierArray &BasePathArray) { 724 assert(BasePathArray.empty() && "Base path array must be empty!"); 725 assert(Paths.isRecordingPaths() && "Must record paths!"); 726 727 const CXXBasePath &Path = Paths.front(); 728 729 // We first go backward and check if we have a virtual base. 730 // FIXME: It would be better if CXXBasePath had the base specifier for 731 // the nearest virtual base. 732 unsigned Start = 0; 733 for (unsigned I = Path.size(); I != 0; --I) { 734 if (Path[I - 1].Base->isVirtual()) { 735 Start = I - 1; 736 break; 737 } 738 } 739 740 // Now add all bases. 741 for (unsigned I = Start, E = Path.size(); I != E; ++I) 742 BasePathArray.push_back(Path[I].Base); 743} 744 745/// \brief Determine whether the given base path includes a virtual 746/// base class. 747bool Sema::BasePathInvolvesVirtualBase(const CXXBaseSpecifierArray &BasePath) { 748 for (CXXBaseSpecifierArray::iterator B = BasePath.begin(), 749 BEnd = BasePath.end(); 750 B != BEnd; ++B) 751 if ((*B)->isVirtual()) 752 return true; 753 754 return false; 755} 756 757/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 758/// conversion (where Derived and Base are class types) is 759/// well-formed, meaning that the conversion is unambiguous (and 760/// that all of the base classes are accessible). Returns true 761/// and emits a diagnostic if the code is ill-formed, returns false 762/// otherwise. Loc is the location where this routine should point to 763/// if there is an error, and Range is the source range to highlight 764/// if there is an error. 765bool 766Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 767 unsigned InaccessibleBaseID, 768 unsigned AmbigiousBaseConvID, 769 SourceLocation Loc, SourceRange Range, 770 DeclarationName Name, 771 CXXBaseSpecifierArray *BasePath) { 772 // First, determine whether the path from Derived to Base is 773 // ambiguous. This is slightly more expensive than checking whether 774 // the Derived to Base conversion exists, because here we need to 775 // explore multiple paths to determine if there is an ambiguity. 776 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 777 /*DetectVirtual=*/false); 778 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 779 assert(DerivationOkay && 780 "Can only be used with a derived-to-base conversion"); 781 (void)DerivationOkay; 782 783 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 784 if (InaccessibleBaseID) { 785 // Check that the base class can be accessed. 786 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 787 InaccessibleBaseID)) { 788 case AR_inaccessible: 789 return true; 790 case AR_accessible: 791 case AR_dependent: 792 case AR_delayed: 793 break; 794 } 795 } 796 797 // Build a base path if necessary. 798 if (BasePath) 799 BuildBasePathArray(Paths, *BasePath); 800 return false; 801 } 802 803 // We know that the derived-to-base conversion is ambiguous, and 804 // we're going to produce a diagnostic. Perform the derived-to-base 805 // search just one more time to compute all of the possible paths so 806 // that we can print them out. This is more expensive than any of 807 // the previous derived-to-base checks we've done, but at this point 808 // performance isn't as much of an issue. 809 Paths.clear(); 810 Paths.setRecordingPaths(true); 811 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 812 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 813 (void)StillOkay; 814 815 // Build up a textual representation of the ambiguous paths, e.g., 816 // D -> B -> A, that will be used to illustrate the ambiguous 817 // conversions in the diagnostic. We only print one of the paths 818 // to each base class subobject. 819 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 820 821 Diag(Loc, AmbigiousBaseConvID) 822 << Derived << Base << PathDisplayStr << Range << Name; 823 return true; 824} 825 826bool 827Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 828 SourceLocation Loc, SourceRange Range, 829 CXXBaseSpecifierArray *BasePath, 830 bool IgnoreAccess) { 831 return CheckDerivedToBaseConversion(Derived, Base, 832 IgnoreAccess ? 0 833 : diag::err_upcast_to_inaccessible_base, 834 diag::err_ambiguous_derived_to_base_conv, 835 Loc, Range, DeclarationName(), 836 BasePath); 837} 838 839 840/// @brief Builds a string representing ambiguous paths from a 841/// specific derived class to different subobjects of the same base 842/// class. 843/// 844/// This function builds a string that can be used in error messages 845/// to show the different paths that one can take through the 846/// inheritance hierarchy to go from the derived class to different 847/// subobjects of a base class. The result looks something like this: 848/// @code 849/// struct D -> struct B -> struct A 850/// struct D -> struct C -> struct A 851/// @endcode 852std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 853 std::string PathDisplayStr; 854 std::set<unsigned> DisplayedPaths; 855 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 856 Path != Paths.end(); ++Path) { 857 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 858 // We haven't displayed a path to this particular base 859 // class subobject yet. 860 PathDisplayStr += "\n "; 861 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 862 for (CXXBasePath::const_iterator Element = Path->begin(); 863 Element != Path->end(); ++Element) 864 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 865 } 866 } 867 868 return PathDisplayStr; 869} 870 871//===----------------------------------------------------------------------===// 872// C++ class member Handling 873//===----------------------------------------------------------------------===// 874 875/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 876Sema::DeclPtrTy 877Sema::ActOnAccessSpecifier(AccessSpecifier Access, 878 SourceLocation ASLoc, SourceLocation ColonLoc) { 879 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 880 AccessSpecDecl* ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 881 ASLoc, ColonLoc); 882 CurContext->addHiddenDecl(ASDecl); 883 return DeclPtrTy::make(ASDecl); 884} 885 886/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 887/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 888/// bitfield width if there is one and 'InitExpr' specifies the initializer if 889/// any. 890Sema::DeclPtrTy 891Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 892 MultiTemplateParamsArg TemplateParameterLists, 893 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 894 bool Deleted) { 895 const DeclSpec &DS = D.getDeclSpec(); 896 DeclarationName Name = GetNameForDeclarator(D); 897 Expr *BitWidth = static_cast<Expr*>(BW); 898 Expr *Init = static_cast<Expr*>(InitExpr); 899 SourceLocation Loc = D.getIdentifierLoc(); 900 901 assert(isa<CXXRecordDecl>(CurContext)); 902 assert(!DS.isFriendSpecified()); 903 904 bool isFunc = false; 905 if (D.isFunctionDeclarator()) 906 isFunc = true; 907 else if (D.getNumTypeObjects() == 0 && 908 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 909 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 910 isFunc = TDType->isFunctionType(); 911 } 912 913 // C++ 9.2p6: A member shall not be declared to have automatic storage 914 // duration (auto, register) or with the extern storage-class-specifier. 915 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 916 // data members and cannot be applied to names declared const or static, 917 // and cannot be applied to reference members. 918 switch (DS.getStorageClassSpec()) { 919 case DeclSpec::SCS_unspecified: 920 case DeclSpec::SCS_typedef: 921 case DeclSpec::SCS_static: 922 // FALL THROUGH. 923 break; 924 case DeclSpec::SCS_mutable: 925 if (isFunc) { 926 if (DS.getStorageClassSpecLoc().isValid()) 927 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 928 else 929 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 930 931 // FIXME: It would be nicer if the keyword was ignored only for this 932 // declarator. Otherwise we could get follow-up errors. 933 D.getMutableDeclSpec().ClearStorageClassSpecs(); 934 } 935 break; 936 default: 937 if (DS.getStorageClassSpecLoc().isValid()) 938 Diag(DS.getStorageClassSpecLoc(), 939 diag::err_storageclass_invalid_for_member); 940 else 941 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 942 D.getMutableDeclSpec().ClearStorageClassSpecs(); 943 } 944 945 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 946 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 947 !isFunc); 948 949 Decl *Member; 950 if (isInstField) { 951 // FIXME: Check for template parameters! 952 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 953 AS); 954 assert(Member && "HandleField never returns null"); 955 } else { 956 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 957 .getAs<Decl>(); 958 if (!Member) { 959 if (BitWidth) DeleteExpr(BitWidth); 960 return DeclPtrTy(); 961 } 962 963 // Non-instance-fields can't have a bitfield. 964 if (BitWidth) { 965 if (Member->isInvalidDecl()) { 966 // don't emit another diagnostic. 967 } else if (isa<VarDecl>(Member)) { 968 // C++ 9.6p3: A bit-field shall not be a static member. 969 // "static member 'A' cannot be a bit-field" 970 Diag(Loc, diag::err_static_not_bitfield) 971 << Name << BitWidth->getSourceRange(); 972 } else if (isa<TypedefDecl>(Member)) { 973 // "typedef member 'x' cannot be a bit-field" 974 Diag(Loc, diag::err_typedef_not_bitfield) 975 << Name << BitWidth->getSourceRange(); 976 } else { 977 // A function typedef ("typedef int f(); f a;"). 978 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 979 Diag(Loc, diag::err_not_integral_type_bitfield) 980 << Name << cast<ValueDecl>(Member)->getType() 981 << BitWidth->getSourceRange(); 982 } 983 984 DeleteExpr(BitWidth); 985 BitWidth = 0; 986 Member->setInvalidDecl(); 987 } 988 989 Member->setAccess(AS); 990 991 // If we have declared a member function template, set the access of the 992 // templated declaration as well. 993 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 994 FunTmpl->getTemplatedDecl()->setAccess(AS); 995 } 996 997 assert((Name || isInstField) && "No identifier for non-field ?"); 998 999 if (Init) 1000 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 1001 if (Deleted) // FIXME: Source location is not very good. 1002 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 1003 1004 if (isInstField) { 1005 FieldCollector->Add(cast<FieldDecl>(Member)); 1006 return DeclPtrTy(); 1007 } 1008 return DeclPtrTy::make(Member); 1009} 1010 1011/// \brief Find the direct and/or virtual base specifiers that 1012/// correspond to the given base type, for use in base initialization 1013/// within a constructor. 1014static bool FindBaseInitializer(Sema &SemaRef, 1015 CXXRecordDecl *ClassDecl, 1016 QualType BaseType, 1017 const CXXBaseSpecifier *&DirectBaseSpec, 1018 const CXXBaseSpecifier *&VirtualBaseSpec) { 1019 // First, check for a direct base class. 1020 DirectBaseSpec = 0; 1021 for (CXXRecordDecl::base_class_const_iterator Base 1022 = ClassDecl->bases_begin(); 1023 Base != ClassDecl->bases_end(); ++Base) { 1024 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1025 // We found a direct base of this type. That's what we're 1026 // initializing. 1027 DirectBaseSpec = &*Base; 1028 break; 1029 } 1030 } 1031 1032 // Check for a virtual base class. 1033 // FIXME: We might be able to short-circuit this if we know in advance that 1034 // there are no virtual bases. 1035 VirtualBaseSpec = 0; 1036 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1037 // We haven't found a base yet; search the class hierarchy for a 1038 // virtual base class. 1039 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1040 /*DetectVirtual=*/false); 1041 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1042 BaseType, Paths)) { 1043 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1044 Path != Paths.end(); ++Path) { 1045 if (Path->back().Base->isVirtual()) { 1046 VirtualBaseSpec = Path->back().Base; 1047 break; 1048 } 1049 } 1050 } 1051 } 1052 1053 return DirectBaseSpec || VirtualBaseSpec; 1054} 1055 1056/// ActOnMemInitializer - Handle a C++ member initializer. 1057Sema::MemInitResult 1058Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 1059 Scope *S, 1060 CXXScopeSpec &SS, 1061 IdentifierInfo *MemberOrBase, 1062 TypeTy *TemplateTypeTy, 1063 SourceLocation IdLoc, 1064 SourceLocation LParenLoc, 1065 ExprTy **Args, unsigned NumArgs, 1066 SourceLocation *CommaLocs, 1067 SourceLocation RParenLoc) { 1068 if (!ConstructorD) 1069 return true; 1070 1071 AdjustDeclIfTemplate(ConstructorD); 1072 1073 CXXConstructorDecl *Constructor 1074 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 1075 if (!Constructor) { 1076 // The user wrote a constructor initializer on a function that is 1077 // not a C++ constructor. Ignore the error for now, because we may 1078 // have more member initializers coming; we'll diagnose it just 1079 // once in ActOnMemInitializers. 1080 return true; 1081 } 1082 1083 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1084 1085 // C++ [class.base.init]p2: 1086 // Names in a mem-initializer-id are looked up in the scope of the 1087 // constructor’s class and, if not found in that scope, are looked 1088 // up in the scope containing the constructor’s 1089 // definition. [Note: if the constructor’s class contains a member 1090 // with the same name as a direct or virtual base class of the 1091 // class, a mem-initializer-id naming the member or base class and 1092 // composed of a single identifier refers to the class member. A 1093 // mem-initializer-id for the hidden base class may be specified 1094 // using a qualified name. ] 1095 if (!SS.getScopeRep() && !TemplateTypeTy) { 1096 // Look for a member, first. 1097 FieldDecl *Member = 0; 1098 DeclContext::lookup_result Result 1099 = ClassDecl->lookup(MemberOrBase); 1100 if (Result.first != Result.second) 1101 Member = dyn_cast<FieldDecl>(*Result.first); 1102 1103 // FIXME: Handle members of an anonymous union. 1104 1105 if (Member) 1106 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1107 LParenLoc, RParenLoc); 1108 } 1109 // It didn't name a member, so see if it names a class. 1110 QualType BaseType; 1111 TypeSourceInfo *TInfo = 0; 1112 1113 if (TemplateTypeTy) { 1114 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1115 } else { 1116 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1117 LookupParsedName(R, S, &SS); 1118 1119 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1120 if (!TyD) { 1121 if (R.isAmbiguous()) return true; 1122 1123 // We don't want access-control diagnostics here. 1124 R.suppressDiagnostics(); 1125 1126 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1127 bool NotUnknownSpecialization = false; 1128 DeclContext *DC = computeDeclContext(SS, false); 1129 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1130 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1131 1132 if (!NotUnknownSpecialization) { 1133 // When the scope specifier can refer to a member of an unknown 1134 // specialization, we take it as a type name. 1135 BaseType = CheckTypenameType(ETK_None, 1136 (NestedNameSpecifier *)SS.getScopeRep(), 1137 *MemberOrBase, SourceLocation(), 1138 SS.getRange(), IdLoc); 1139 if (BaseType.isNull()) 1140 return true; 1141 1142 R.clear(); 1143 R.setLookupName(MemberOrBase); 1144 } 1145 } 1146 1147 // If no results were found, try to correct typos. 1148 if (R.empty() && BaseType.isNull() && 1149 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1150 R.isSingleResult()) { 1151 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1152 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1153 // We have found a non-static data member with a similar 1154 // name to what was typed; complain and initialize that 1155 // member. 1156 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1157 << MemberOrBase << true << R.getLookupName() 1158 << FixItHint::CreateReplacement(R.getNameLoc(), 1159 R.getLookupName().getAsString()); 1160 Diag(Member->getLocation(), diag::note_previous_decl) 1161 << Member->getDeclName(); 1162 1163 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1164 LParenLoc, RParenLoc); 1165 } 1166 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1167 const CXXBaseSpecifier *DirectBaseSpec; 1168 const CXXBaseSpecifier *VirtualBaseSpec; 1169 if (FindBaseInitializer(*this, ClassDecl, 1170 Context.getTypeDeclType(Type), 1171 DirectBaseSpec, VirtualBaseSpec)) { 1172 // We have found a direct or virtual base class with a 1173 // similar name to what was typed; complain and initialize 1174 // that base class. 1175 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1176 << MemberOrBase << false << R.getLookupName() 1177 << FixItHint::CreateReplacement(R.getNameLoc(), 1178 R.getLookupName().getAsString()); 1179 1180 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1181 : VirtualBaseSpec; 1182 Diag(BaseSpec->getSourceRange().getBegin(), 1183 diag::note_base_class_specified_here) 1184 << BaseSpec->getType() 1185 << BaseSpec->getSourceRange(); 1186 1187 TyD = Type; 1188 } 1189 } 1190 } 1191 1192 if (!TyD && BaseType.isNull()) { 1193 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1194 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1195 return true; 1196 } 1197 } 1198 1199 if (BaseType.isNull()) { 1200 BaseType = Context.getTypeDeclType(TyD); 1201 if (SS.isSet()) { 1202 NestedNameSpecifier *Qualifier = 1203 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1204 1205 // FIXME: preserve source range information 1206 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1207 } 1208 } 1209 } 1210 1211 if (!TInfo) 1212 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1213 1214 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1215 LParenLoc, RParenLoc, ClassDecl); 1216} 1217 1218/// Checks an initializer expression for use of uninitialized fields, such as 1219/// containing the field that is being initialized. Returns true if there is an 1220/// uninitialized field was used an updates the SourceLocation parameter; false 1221/// otherwise. 1222static bool InitExprContainsUninitializedFields(const Stmt *S, 1223 const FieldDecl *LhsField, 1224 SourceLocation *L) { 1225 if (isa<CallExpr>(S)) { 1226 // Do not descend into function calls or constructors, as the use 1227 // of an uninitialized field may be valid. One would have to inspect 1228 // the contents of the function/ctor to determine if it is safe or not. 1229 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1230 // may be safe, depending on what the function/ctor does. 1231 return false; 1232 } 1233 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1234 const NamedDecl *RhsField = ME->getMemberDecl(); 1235 if (RhsField == LhsField) { 1236 // Initializing a field with itself. Throw a warning. 1237 // But wait; there are exceptions! 1238 // Exception #1: The field may not belong to this record. 1239 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1240 const Expr *base = ME->getBase(); 1241 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1242 // Even though the field matches, it does not belong to this record. 1243 return false; 1244 } 1245 // None of the exceptions triggered; return true to indicate an 1246 // uninitialized field was used. 1247 *L = ME->getMemberLoc(); 1248 return true; 1249 } 1250 } 1251 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1252 it != e; ++it) { 1253 if (!*it) { 1254 // An expression such as 'member(arg ?: "")' may trigger this. 1255 continue; 1256 } 1257 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1258 return true; 1259 } 1260 return false; 1261} 1262 1263Sema::MemInitResult 1264Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1265 unsigned NumArgs, SourceLocation IdLoc, 1266 SourceLocation LParenLoc, 1267 SourceLocation RParenLoc) { 1268 // Diagnose value-uses of fields to initialize themselves, e.g. 1269 // foo(foo) 1270 // where foo is not also a parameter to the constructor. 1271 // TODO: implement -Wuninitialized and fold this into that framework. 1272 for (unsigned i = 0; i < NumArgs; ++i) { 1273 SourceLocation L; 1274 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1275 // FIXME: Return true in the case when other fields are used before being 1276 // uninitialized. For example, let this field be the i'th field. When 1277 // initializing the i'th field, throw a warning if any of the >= i'th 1278 // fields are used, as they are not yet initialized. 1279 // Right now we are only handling the case where the i'th field uses 1280 // itself in its initializer. 1281 Diag(L, diag::warn_field_is_uninit); 1282 } 1283 } 1284 1285 bool HasDependentArg = false; 1286 for (unsigned i = 0; i < NumArgs; i++) 1287 HasDependentArg |= Args[i]->isTypeDependent(); 1288 1289 if (Member->getType()->isDependentType() || HasDependentArg) { 1290 // Can't check initialization for a member of dependent type or when 1291 // any of the arguments are type-dependent expressions. 1292 OwningExprResult Init 1293 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1294 RParenLoc)); 1295 1296 // Erase any temporaries within this evaluation context; we're not 1297 // going to track them in the AST, since we'll be rebuilding the 1298 // ASTs during template instantiation. 1299 ExprTemporaries.erase( 1300 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1301 ExprTemporaries.end()); 1302 1303 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1304 LParenLoc, 1305 Init.takeAs<Expr>(), 1306 RParenLoc); 1307 1308 } 1309 1310 if (Member->isInvalidDecl()) 1311 return true; 1312 1313 // Initialize the member. 1314 InitializedEntity MemberEntity = 1315 InitializedEntity::InitializeMember(Member, 0); 1316 InitializationKind Kind = 1317 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1318 1319 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1320 1321 OwningExprResult MemberInit = 1322 InitSeq.Perform(*this, MemberEntity, Kind, 1323 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1324 if (MemberInit.isInvalid()) 1325 return true; 1326 1327 // C++0x [class.base.init]p7: 1328 // The initialization of each base and member constitutes a 1329 // full-expression. 1330 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1331 if (MemberInit.isInvalid()) 1332 return true; 1333 1334 // If we are in a dependent context, template instantiation will 1335 // perform this type-checking again. Just save the arguments that we 1336 // received in a ParenListExpr. 1337 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1338 // of the information that we have about the member 1339 // initializer. However, deconstructing the ASTs is a dicey process, 1340 // and this approach is far more likely to get the corner cases right. 1341 if (CurContext->isDependentContext()) { 1342 // Bump the reference count of all of the arguments. 1343 for (unsigned I = 0; I != NumArgs; ++I) 1344 Args[I]->Retain(); 1345 1346 OwningExprResult Init 1347 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1348 RParenLoc)); 1349 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1350 LParenLoc, 1351 Init.takeAs<Expr>(), 1352 RParenLoc); 1353 } 1354 1355 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1356 LParenLoc, 1357 MemberInit.takeAs<Expr>(), 1358 RParenLoc); 1359} 1360 1361Sema::MemInitResult 1362Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1363 Expr **Args, unsigned NumArgs, 1364 SourceLocation LParenLoc, SourceLocation RParenLoc, 1365 CXXRecordDecl *ClassDecl) { 1366 bool HasDependentArg = false; 1367 for (unsigned i = 0; i < NumArgs; i++) 1368 HasDependentArg |= Args[i]->isTypeDependent(); 1369 1370 SourceLocation BaseLoc 1371 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1372 1373 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1374 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1375 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1376 1377 // C++ [class.base.init]p2: 1378 // [...] Unless the mem-initializer-id names a nonstatic data 1379 // member of the constructor’s class or a direct or virtual base 1380 // of that class, the mem-initializer is ill-formed. A 1381 // mem-initializer-list can initialize a base class using any 1382 // name that denotes that base class type. 1383 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1384 1385 // Check for direct and virtual base classes. 1386 const CXXBaseSpecifier *DirectBaseSpec = 0; 1387 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1388 if (!Dependent) { 1389 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1390 VirtualBaseSpec); 1391 1392 // C++ [base.class.init]p2: 1393 // Unless the mem-initializer-id names a nonstatic data member of the 1394 // constructor's class or a direct or virtual base of that class, the 1395 // mem-initializer is ill-formed. 1396 if (!DirectBaseSpec && !VirtualBaseSpec) { 1397 // If the class has any dependent bases, then it's possible that 1398 // one of those types will resolve to the same type as 1399 // BaseType. Therefore, just treat this as a dependent base 1400 // class initialization. FIXME: Should we try to check the 1401 // initialization anyway? It seems odd. 1402 if (ClassDecl->hasAnyDependentBases()) 1403 Dependent = true; 1404 else 1405 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1406 << BaseType << Context.getTypeDeclType(ClassDecl) 1407 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1408 } 1409 } 1410 1411 if (Dependent) { 1412 // Can't check initialization for a base of dependent type or when 1413 // any of the arguments are type-dependent expressions. 1414 OwningExprResult BaseInit 1415 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1416 RParenLoc)); 1417 1418 // Erase any temporaries within this evaluation context; we're not 1419 // going to track them in the AST, since we'll be rebuilding the 1420 // ASTs during template instantiation. 1421 ExprTemporaries.erase( 1422 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1423 ExprTemporaries.end()); 1424 1425 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1426 /*IsVirtual=*/false, 1427 LParenLoc, 1428 BaseInit.takeAs<Expr>(), 1429 RParenLoc); 1430 } 1431 1432 // C++ [base.class.init]p2: 1433 // If a mem-initializer-id is ambiguous because it designates both 1434 // a direct non-virtual base class and an inherited virtual base 1435 // class, the mem-initializer is ill-formed. 1436 if (DirectBaseSpec && VirtualBaseSpec) 1437 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1438 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1439 1440 CXXBaseSpecifier *BaseSpec 1441 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1442 if (!BaseSpec) 1443 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1444 1445 // Initialize the base. 1446 InitializedEntity BaseEntity = 1447 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1448 InitializationKind Kind = 1449 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1450 1451 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1452 1453 OwningExprResult BaseInit = 1454 InitSeq.Perform(*this, BaseEntity, Kind, 1455 MultiExprArg(*this, (void**)Args, NumArgs), 0); 1456 if (BaseInit.isInvalid()) 1457 return true; 1458 1459 // C++0x [class.base.init]p7: 1460 // The initialization of each base and member constitutes a 1461 // full-expression. 1462 BaseInit = MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1463 if (BaseInit.isInvalid()) 1464 return true; 1465 1466 // If we are in a dependent context, template instantiation will 1467 // perform this type-checking again. Just save the arguments that we 1468 // received in a ParenListExpr. 1469 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1470 // of the information that we have about the base 1471 // initializer. However, deconstructing the ASTs is a dicey process, 1472 // and this approach is far more likely to get the corner cases right. 1473 if (CurContext->isDependentContext()) { 1474 // Bump the reference count of all of the arguments. 1475 for (unsigned I = 0; I != NumArgs; ++I) 1476 Args[I]->Retain(); 1477 1478 OwningExprResult Init 1479 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1480 RParenLoc)); 1481 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1482 BaseSpec->isVirtual(), 1483 LParenLoc, 1484 Init.takeAs<Expr>(), 1485 RParenLoc); 1486 } 1487 1488 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1489 BaseSpec->isVirtual(), 1490 LParenLoc, 1491 BaseInit.takeAs<Expr>(), 1492 RParenLoc); 1493} 1494 1495/// ImplicitInitializerKind - How an implicit base or member initializer should 1496/// initialize its base or member. 1497enum ImplicitInitializerKind { 1498 IIK_Default, 1499 IIK_Copy, 1500 IIK_Move 1501}; 1502 1503static bool 1504BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1505 ImplicitInitializerKind ImplicitInitKind, 1506 CXXBaseSpecifier *BaseSpec, 1507 bool IsInheritedVirtualBase, 1508 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1509 InitializedEntity InitEntity 1510 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1511 IsInheritedVirtualBase); 1512 1513 Sema::OwningExprResult BaseInit(SemaRef); 1514 1515 switch (ImplicitInitKind) { 1516 case IIK_Default: { 1517 InitializationKind InitKind 1518 = InitializationKind::CreateDefault(Constructor->getLocation()); 1519 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1520 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1521 Sema::MultiExprArg(SemaRef, 0, 0)); 1522 break; 1523 } 1524 1525 case IIK_Copy: { 1526 ParmVarDecl *Param = Constructor->getParamDecl(0); 1527 QualType ParamType = Param->getType().getNonReferenceType(); 1528 1529 Expr *CopyCtorArg = 1530 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1531 Constructor->getLocation(), ParamType, 0); 1532 1533 // Cast to the base class to avoid ambiguities. 1534 QualType ArgTy = 1535 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1536 ParamType.getQualifiers()); 1537 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1538 CastExpr::CK_UncheckedDerivedToBase, 1539 ImplicitCastExpr::LValue, 1540 CXXBaseSpecifierArray(BaseSpec)); 1541 1542 InitializationKind InitKind 1543 = InitializationKind::CreateDirect(Constructor->getLocation(), 1544 SourceLocation(), SourceLocation()); 1545 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1546 &CopyCtorArg, 1); 1547 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1548 Sema::MultiExprArg(SemaRef, 1549 (void**)&CopyCtorArg, 1)); 1550 break; 1551 } 1552 1553 case IIK_Move: 1554 assert(false && "Unhandled initializer kind!"); 1555 } 1556 1557 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(BaseInit)); 1558 if (BaseInit.isInvalid()) 1559 return true; 1560 1561 CXXBaseInit = 1562 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1563 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1564 SourceLocation()), 1565 BaseSpec->isVirtual(), 1566 SourceLocation(), 1567 BaseInit.takeAs<Expr>(), 1568 SourceLocation()); 1569 1570 return false; 1571} 1572 1573static bool 1574BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1575 ImplicitInitializerKind ImplicitInitKind, 1576 FieldDecl *Field, 1577 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1578 if (Field->isInvalidDecl()) 1579 return true; 1580 1581 SourceLocation Loc = Constructor->getLocation(); 1582 1583 if (ImplicitInitKind == IIK_Copy) { 1584 ParmVarDecl *Param = Constructor->getParamDecl(0); 1585 QualType ParamType = Param->getType().getNonReferenceType(); 1586 1587 Expr *MemberExprBase = 1588 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1589 Loc, ParamType, 0); 1590 1591 // Build a reference to this field within the parameter. 1592 CXXScopeSpec SS; 1593 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1594 Sema::LookupMemberName); 1595 MemberLookup.addDecl(Field, AS_public); 1596 MemberLookup.resolveKind(); 1597 Sema::OwningExprResult CopyCtorArg 1598 = SemaRef.BuildMemberReferenceExpr(SemaRef.Owned(MemberExprBase), 1599 ParamType, Loc, 1600 /*IsArrow=*/false, 1601 SS, 1602 /*FirstQualifierInScope=*/0, 1603 MemberLookup, 1604 /*TemplateArgs=*/0); 1605 if (CopyCtorArg.isInvalid()) 1606 return true; 1607 1608 // When the field we are copying is an array, create index variables for 1609 // each dimension of the array. We use these index variables to subscript 1610 // the source array, and other clients (e.g., CodeGen) will perform the 1611 // necessary iteration with these index variables. 1612 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1613 QualType BaseType = Field->getType(); 1614 QualType SizeType = SemaRef.Context.getSizeType(); 1615 while (const ConstantArrayType *Array 1616 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1617 // Create the iteration variable for this array index. 1618 IdentifierInfo *IterationVarName = 0; 1619 { 1620 llvm::SmallString<8> Str; 1621 llvm::raw_svector_ostream OS(Str); 1622 OS << "__i" << IndexVariables.size(); 1623 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1624 } 1625 VarDecl *IterationVar 1626 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1627 IterationVarName, SizeType, 1628 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1629 VarDecl::None, VarDecl::None); 1630 IndexVariables.push_back(IterationVar); 1631 1632 // Create a reference to the iteration variable. 1633 Sema::OwningExprResult IterationVarRef 1634 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1635 assert(!IterationVarRef.isInvalid() && 1636 "Reference to invented variable cannot fail!"); 1637 1638 // Subscript the array with this iteration variable. 1639 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(move(CopyCtorArg), 1640 Loc, 1641 move(IterationVarRef), 1642 Loc); 1643 if (CopyCtorArg.isInvalid()) 1644 return true; 1645 1646 BaseType = Array->getElementType(); 1647 } 1648 1649 // Construct the entity that we will be initializing. For an array, this 1650 // will be first element in the array, which may require several levels 1651 // of array-subscript entities. 1652 llvm::SmallVector<InitializedEntity, 4> Entities; 1653 Entities.reserve(1 + IndexVariables.size()); 1654 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1655 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1656 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1657 0, 1658 Entities.back())); 1659 1660 // Direct-initialize to use the copy constructor. 1661 InitializationKind InitKind = 1662 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1663 1664 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1665 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1666 &CopyCtorArgE, 1); 1667 1668 Sema::OwningExprResult MemberInit 1669 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1670 Sema::MultiExprArg(SemaRef, (void**)&CopyCtorArgE, 1)); 1671 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1672 if (MemberInit.isInvalid()) 1673 return true; 1674 1675 CXXMemberInit 1676 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1677 MemberInit.takeAs<Expr>(), Loc, 1678 IndexVariables.data(), 1679 IndexVariables.size()); 1680 return false; 1681 } 1682 1683 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1684 1685 QualType FieldBaseElementType = 1686 SemaRef.Context.getBaseElementType(Field->getType()); 1687 1688 if (FieldBaseElementType->isRecordType()) { 1689 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1690 InitializationKind InitKind = 1691 InitializationKind::CreateDefault(Loc); 1692 1693 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1694 Sema::OwningExprResult MemberInit = 1695 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1696 Sema::MultiExprArg(SemaRef, 0, 0)); 1697 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 1698 if (MemberInit.isInvalid()) 1699 return true; 1700 1701 CXXMemberInit = 1702 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1703 Field, Loc, Loc, 1704 MemberInit.takeAs<Expr>(), 1705 Loc); 1706 return false; 1707 } 1708 1709 if (FieldBaseElementType->isReferenceType()) { 1710 SemaRef.Diag(Constructor->getLocation(), 1711 diag::err_uninitialized_member_in_ctor) 1712 << (int)Constructor->isImplicit() 1713 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1714 << 0 << Field->getDeclName(); 1715 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1716 return true; 1717 } 1718 1719 if (FieldBaseElementType.isConstQualified()) { 1720 SemaRef.Diag(Constructor->getLocation(), 1721 diag::err_uninitialized_member_in_ctor) 1722 << (int)Constructor->isImplicit() 1723 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1724 << 1 << Field->getDeclName(); 1725 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1726 return true; 1727 } 1728 1729 // Nothing to initialize. 1730 CXXMemberInit = 0; 1731 return false; 1732} 1733 1734namespace { 1735struct BaseAndFieldInfo { 1736 Sema &S; 1737 CXXConstructorDecl *Ctor; 1738 bool AnyErrorsInInits; 1739 ImplicitInitializerKind IIK; 1740 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1741 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1742 1743 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1744 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1745 // FIXME: Handle implicit move constructors. 1746 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1747 IIK = IIK_Copy; 1748 else 1749 IIK = IIK_Default; 1750 } 1751}; 1752} 1753 1754static void RecordFieldInitializer(BaseAndFieldInfo &Info, 1755 FieldDecl *Top, FieldDecl *Field, 1756 CXXBaseOrMemberInitializer *Init) { 1757 // If the member doesn't need to be initialized, Init will still be null. 1758 if (!Init) 1759 return; 1760 1761 Info.AllToInit.push_back(Init); 1762 if (Field != Top) { 1763 Init->setMember(Top); 1764 Init->setAnonUnionMember(Field); 1765 } 1766} 1767 1768static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1769 FieldDecl *Top, FieldDecl *Field) { 1770 1771 // Overwhelmingly common case: we have a direct initializer for this field. 1772 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1773 RecordFieldInitializer(Info, Top, Field, Init); 1774 return false; 1775 } 1776 1777 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1778 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1779 assert(FieldClassType && "anonymous struct/union without record type"); 1780 CXXRecordDecl *FieldClassDecl 1781 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1782 1783 // Even though union members never have non-trivial default 1784 // constructions in C++03, we still build member initializers for aggregate 1785 // record types which can be union members, and C++0x allows non-trivial 1786 // default constructors for union members, so we ensure that only one 1787 // member is initialized for these. 1788 if (FieldClassDecl->isUnion()) { 1789 // First check for an explicit initializer for one field. 1790 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1791 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1792 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1793 RecordFieldInitializer(Info, Top, *FA, Init); 1794 1795 // Once we've initialized a field of an anonymous union, the union 1796 // field in the class is also initialized, so exit immediately. 1797 return false; 1798 } 1799 } 1800 1801 // Fallthrough and construct a default initializer for the union as 1802 // a whole, which can call its default constructor if such a thing exists 1803 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1804 // behavior going forward with C++0x, when anonymous unions there are 1805 // finalized, we should revisit this. 1806 } else { 1807 // For structs, we simply descend through to initialize all members where 1808 // necessary. 1809 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1810 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1811 if (CollectFieldInitializer(Info, Top, *FA)) 1812 return true; 1813 } 1814 } 1815 } 1816 1817 // Don't try to build an implicit initializer if there were semantic 1818 // errors in any of the initializers (and therefore we might be 1819 // missing some that the user actually wrote). 1820 if (Info.AnyErrorsInInits) 1821 return false; 1822 1823 CXXBaseOrMemberInitializer *Init = 0; 1824 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1825 return true; 1826 1827 RecordFieldInitializer(Info, Top, Field, Init); 1828 return false; 1829} 1830 1831bool 1832Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1833 CXXBaseOrMemberInitializer **Initializers, 1834 unsigned NumInitializers, 1835 bool AnyErrors) { 1836 if (Constructor->getDeclContext()->isDependentContext()) { 1837 // Just store the initializers as written, they will be checked during 1838 // instantiation. 1839 if (NumInitializers > 0) { 1840 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1841 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1842 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1843 memcpy(baseOrMemberInitializers, Initializers, 1844 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1845 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1846 } 1847 1848 return false; 1849 } 1850 1851 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1852 1853 // We need to build the initializer AST according to order of construction 1854 // and not what user specified in the Initializers list. 1855 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1856 if (!ClassDecl) 1857 return true; 1858 1859 bool HadError = false; 1860 1861 for (unsigned i = 0; i < NumInitializers; i++) { 1862 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1863 1864 if (Member->isBaseInitializer()) 1865 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1866 else 1867 Info.AllBaseFields[Member->getMember()] = Member; 1868 } 1869 1870 // Keep track of the direct virtual bases. 1871 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1872 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1873 E = ClassDecl->bases_end(); I != E; ++I) { 1874 if (I->isVirtual()) 1875 DirectVBases.insert(I); 1876 } 1877 1878 // Push virtual bases before others. 1879 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1880 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1881 1882 if (CXXBaseOrMemberInitializer *Value 1883 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1884 Info.AllToInit.push_back(Value); 1885 } else if (!AnyErrors) { 1886 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1887 CXXBaseOrMemberInitializer *CXXBaseInit; 1888 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1889 VBase, IsInheritedVirtualBase, 1890 CXXBaseInit)) { 1891 HadError = true; 1892 continue; 1893 } 1894 1895 Info.AllToInit.push_back(CXXBaseInit); 1896 } 1897 } 1898 1899 // Non-virtual bases. 1900 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1901 E = ClassDecl->bases_end(); Base != E; ++Base) { 1902 // Virtuals are in the virtual base list and already constructed. 1903 if (Base->isVirtual()) 1904 continue; 1905 1906 if (CXXBaseOrMemberInitializer *Value 1907 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1908 Info.AllToInit.push_back(Value); 1909 } else if (!AnyErrors) { 1910 CXXBaseOrMemberInitializer *CXXBaseInit; 1911 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1912 Base, /*IsInheritedVirtualBase=*/false, 1913 CXXBaseInit)) { 1914 HadError = true; 1915 continue; 1916 } 1917 1918 Info.AllToInit.push_back(CXXBaseInit); 1919 } 1920 } 1921 1922 // Fields. 1923 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1924 E = ClassDecl->field_end(); Field != E; ++Field) { 1925 if ((*Field)->getType()->isIncompleteArrayType()) { 1926 assert(ClassDecl->hasFlexibleArrayMember() && 1927 "Incomplete array type is not valid"); 1928 continue; 1929 } 1930 if (CollectFieldInitializer(Info, *Field, *Field)) 1931 HadError = true; 1932 } 1933 1934 NumInitializers = Info.AllToInit.size(); 1935 if (NumInitializers > 0) { 1936 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1937 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1938 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1939 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1940 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1941 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1942 1943 // Constructors implicitly reference the base and member 1944 // destructors. 1945 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1946 Constructor->getParent()); 1947 } 1948 1949 return HadError; 1950} 1951 1952static void *GetKeyForTopLevelField(FieldDecl *Field) { 1953 // For anonymous unions, use the class declaration as the key. 1954 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1955 if (RT->getDecl()->isAnonymousStructOrUnion()) 1956 return static_cast<void *>(RT->getDecl()); 1957 } 1958 return static_cast<void *>(Field); 1959} 1960 1961static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1962 return Context.getCanonicalType(BaseType).getTypePtr(); 1963} 1964 1965static void *GetKeyForMember(ASTContext &Context, 1966 CXXBaseOrMemberInitializer *Member, 1967 bool MemberMaybeAnon = false) { 1968 if (!Member->isMemberInitializer()) 1969 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1970 1971 // For fields injected into the class via declaration of an anonymous union, 1972 // use its anonymous union class declaration as the unique key. 1973 FieldDecl *Field = Member->getMember(); 1974 1975 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1976 // data member of the class. Data member used in the initializer list is 1977 // in AnonUnionMember field. 1978 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1979 Field = Member->getAnonUnionMember(); 1980 1981 // If the field is a member of an anonymous struct or union, our key 1982 // is the anonymous record decl that's a direct child of the class. 1983 RecordDecl *RD = Field->getParent(); 1984 if (RD->isAnonymousStructOrUnion()) { 1985 while (true) { 1986 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1987 if (Parent->isAnonymousStructOrUnion()) 1988 RD = Parent; 1989 else 1990 break; 1991 } 1992 1993 return static_cast<void *>(RD); 1994 } 1995 1996 return static_cast<void *>(Field); 1997} 1998 1999static void 2000DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2001 const CXXConstructorDecl *Constructor, 2002 CXXBaseOrMemberInitializer **Inits, 2003 unsigned NumInits) { 2004 if (Constructor->getDeclContext()->isDependentContext()) 2005 return; 2006 2007 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 2008 == Diagnostic::Ignored) 2009 return; 2010 2011 // Build the list of bases and members in the order that they'll 2012 // actually be initialized. The explicit initializers should be in 2013 // this same order but may be missing things. 2014 llvm::SmallVector<const void*, 32> IdealInitKeys; 2015 2016 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2017 2018 // 1. Virtual bases. 2019 for (CXXRecordDecl::base_class_const_iterator VBase = 2020 ClassDecl->vbases_begin(), 2021 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2022 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2023 2024 // 2. Non-virtual bases. 2025 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2026 E = ClassDecl->bases_end(); Base != E; ++Base) { 2027 if (Base->isVirtual()) 2028 continue; 2029 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2030 } 2031 2032 // 3. Direct fields. 2033 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2034 E = ClassDecl->field_end(); Field != E; ++Field) 2035 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2036 2037 unsigned NumIdealInits = IdealInitKeys.size(); 2038 unsigned IdealIndex = 0; 2039 2040 CXXBaseOrMemberInitializer *PrevInit = 0; 2041 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2042 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2043 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2044 2045 // Scan forward to try to find this initializer in the idealized 2046 // initializers list. 2047 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2048 if (InitKey == IdealInitKeys[IdealIndex]) 2049 break; 2050 2051 // If we didn't find this initializer, it must be because we 2052 // scanned past it on a previous iteration. That can only 2053 // happen if we're out of order; emit a warning. 2054 if (IdealIndex == NumIdealInits && PrevInit) { 2055 Sema::SemaDiagnosticBuilder D = 2056 SemaRef.Diag(PrevInit->getSourceLocation(), 2057 diag::warn_initializer_out_of_order); 2058 2059 if (PrevInit->isMemberInitializer()) 2060 D << 0 << PrevInit->getMember()->getDeclName(); 2061 else 2062 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2063 2064 if (Init->isMemberInitializer()) 2065 D << 0 << Init->getMember()->getDeclName(); 2066 else 2067 D << 1 << Init->getBaseClassInfo()->getType(); 2068 2069 // Move back to the initializer's location in the ideal list. 2070 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2071 if (InitKey == IdealInitKeys[IdealIndex]) 2072 break; 2073 2074 assert(IdealIndex != NumIdealInits && 2075 "initializer not found in initializer list"); 2076 } 2077 2078 PrevInit = Init; 2079 } 2080} 2081 2082namespace { 2083bool CheckRedundantInit(Sema &S, 2084 CXXBaseOrMemberInitializer *Init, 2085 CXXBaseOrMemberInitializer *&PrevInit) { 2086 if (!PrevInit) { 2087 PrevInit = Init; 2088 return false; 2089 } 2090 2091 if (FieldDecl *Field = Init->getMember()) 2092 S.Diag(Init->getSourceLocation(), 2093 diag::err_multiple_mem_initialization) 2094 << Field->getDeclName() 2095 << Init->getSourceRange(); 2096 else { 2097 Type *BaseClass = Init->getBaseClass(); 2098 assert(BaseClass && "neither field nor base"); 2099 S.Diag(Init->getSourceLocation(), 2100 diag::err_multiple_base_initialization) 2101 << QualType(BaseClass, 0) 2102 << Init->getSourceRange(); 2103 } 2104 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2105 << 0 << PrevInit->getSourceRange(); 2106 2107 return true; 2108} 2109 2110typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2111typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2112 2113bool CheckRedundantUnionInit(Sema &S, 2114 CXXBaseOrMemberInitializer *Init, 2115 RedundantUnionMap &Unions) { 2116 FieldDecl *Field = Init->getMember(); 2117 RecordDecl *Parent = Field->getParent(); 2118 if (!Parent->isAnonymousStructOrUnion()) 2119 return false; 2120 2121 NamedDecl *Child = Field; 2122 do { 2123 if (Parent->isUnion()) { 2124 UnionEntry &En = Unions[Parent]; 2125 if (En.first && En.first != Child) { 2126 S.Diag(Init->getSourceLocation(), 2127 diag::err_multiple_mem_union_initialization) 2128 << Field->getDeclName() 2129 << Init->getSourceRange(); 2130 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2131 << 0 << En.second->getSourceRange(); 2132 return true; 2133 } else if (!En.first) { 2134 En.first = Child; 2135 En.second = Init; 2136 } 2137 } 2138 2139 Child = Parent; 2140 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2141 } while (Parent->isAnonymousStructOrUnion()); 2142 2143 return false; 2144} 2145} 2146 2147/// ActOnMemInitializers - Handle the member initializers for a constructor. 2148void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 2149 SourceLocation ColonLoc, 2150 MemInitTy **meminits, unsigned NumMemInits, 2151 bool AnyErrors) { 2152 if (!ConstructorDecl) 2153 return; 2154 2155 AdjustDeclIfTemplate(ConstructorDecl); 2156 2157 CXXConstructorDecl *Constructor 2158 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 2159 2160 if (!Constructor) { 2161 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2162 return; 2163 } 2164 2165 CXXBaseOrMemberInitializer **MemInits = 2166 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2167 2168 // Mapping for the duplicate initializers check. 2169 // For member initializers, this is keyed with a FieldDecl*. 2170 // For base initializers, this is keyed with a Type*. 2171 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2172 2173 // Mapping for the inconsistent anonymous-union initializers check. 2174 RedundantUnionMap MemberUnions; 2175 2176 bool HadError = false; 2177 for (unsigned i = 0; i < NumMemInits; i++) { 2178 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2179 2180 // Set the source order index. 2181 Init->setSourceOrder(i); 2182 2183 if (Init->isMemberInitializer()) { 2184 FieldDecl *Field = Init->getMember(); 2185 if (CheckRedundantInit(*this, Init, Members[Field]) || 2186 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2187 HadError = true; 2188 } else { 2189 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2190 if (CheckRedundantInit(*this, Init, Members[Key])) 2191 HadError = true; 2192 } 2193 } 2194 2195 if (HadError) 2196 return; 2197 2198 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2199 2200 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2201} 2202 2203void 2204Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2205 CXXRecordDecl *ClassDecl) { 2206 // Ignore dependent contexts. 2207 if (ClassDecl->isDependentContext()) 2208 return; 2209 2210 // FIXME: all the access-control diagnostics are positioned on the 2211 // field/base declaration. That's probably good; that said, the 2212 // user might reasonably want to know why the destructor is being 2213 // emitted, and we currently don't say. 2214 2215 // Non-static data members. 2216 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2217 E = ClassDecl->field_end(); I != E; ++I) { 2218 FieldDecl *Field = *I; 2219 if (Field->isInvalidDecl()) 2220 continue; 2221 QualType FieldType = Context.getBaseElementType(Field->getType()); 2222 2223 const RecordType* RT = FieldType->getAs<RecordType>(); 2224 if (!RT) 2225 continue; 2226 2227 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2228 if (FieldClassDecl->hasTrivialDestructor()) 2229 continue; 2230 2231 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2232 CheckDestructorAccess(Field->getLocation(), Dtor, 2233 PDiag(diag::err_access_dtor_field) 2234 << Field->getDeclName() 2235 << FieldType); 2236 2237 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2238 } 2239 2240 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2241 2242 // Bases. 2243 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2244 E = ClassDecl->bases_end(); Base != E; ++Base) { 2245 // Bases are always records in a well-formed non-dependent class. 2246 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2247 2248 // Remember direct virtual bases. 2249 if (Base->isVirtual()) 2250 DirectVirtualBases.insert(RT); 2251 2252 // Ignore trivial destructors. 2253 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2254 if (BaseClassDecl->hasTrivialDestructor()) 2255 continue; 2256 2257 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2258 2259 // FIXME: caret should be on the start of the class name 2260 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2261 PDiag(diag::err_access_dtor_base) 2262 << Base->getType() 2263 << Base->getSourceRange()); 2264 2265 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2266 } 2267 2268 // Virtual bases. 2269 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2270 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2271 2272 // Bases are always records in a well-formed non-dependent class. 2273 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2274 2275 // Ignore direct virtual bases. 2276 if (DirectVirtualBases.count(RT)) 2277 continue; 2278 2279 // Ignore trivial destructors. 2280 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2281 if (BaseClassDecl->hasTrivialDestructor()) 2282 continue; 2283 2284 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2285 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2286 PDiag(diag::err_access_dtor_vbase) 2287 << VBase->getType()); 2288 2289 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2290 } 2291} 2292 2293void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 2294 if (!CDtorDecl) 2295 return; 2296 2297 if (CXXConstructorDecl *Constructor 2298 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 2299 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2300} 2301 2302bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2303 unsigned DiagID, AbstractDiagSelID SelID, 2304 const CXXRecordDecl *CurrentRD) { 2305 if (SelID == -1) 2306 return RequireNonAbstractType(Loc, T, 2307 PDiag(DiagID), CurrentRD); 2308 else 2309 return RequireNonAbstractType(Loc, T, 2310 PDiag(DiagID) << SelID, CurrentRD); 2311} 2312 2313bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2314 const PartialDiagnostic &PD, 2315 const CXXRecordDecl *CurrentRD) { 2316 if (!getLangOptions().CPlusPlus) 2317 return false; 2318 2319 if (const ArrayType *AT = Context.getAsArrayType(T)) 2320 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 2321 CurrentRD); 2322 2323 if (const PointerType *PT = T->getAs<PointerType>()) { 2324 // Find the innermost pointer type. 2325 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2326 PT = T; 2327 2328 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2329 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 2330 } 2331 2332 const RecordType *RT = T->getAs<RecordType>(); 2333 if (!RT) 2334 return false; 2335 2336 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2337 2338 if (CurrentRD && CurrentRD != RD) 2339 return false; 2340 2341 // FIXME: is this reasonable? It matches current behavior, but.... 2342 if (!RD->getDefinition()) 2343 return false; 2344 2345 if (!RD->isAbstract()) 2346 return false; 2347 2348 Diag(Loc, PD) << RD->getDeclName(); 2349 2350 // Check if we've already emitted the list of pure virtual functions for this 2351 // class. 2352 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2353 return true; 2354 2355 CXXFinalOverriderMap FinalOverriders; 2356 RD->getFinalOverriders(FinalOverriders); 2357 2358 // Keep a set of seen pure methods so we won't diagnose the same method 2359 // more than once. 2360 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2361 2362 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2363 MEnd = FinalOverriders.end(); 2364 M != MEnd; 2365 ++M) { 2366 for (OverridingMethods::iterator SO = M->second.begin(), 2367 SOEnd = M->second.end(); 2368 SO != SOEnd; ++SO) { 2369 // C++ [class.abstract]p4: 2370 // A class is abstract if it contains or inherits at least one 2371 // pure virtual function for which the final overrider is pure 2372 // virtual. 2373 2374 // 2375 if (SO->second.size() != 1) 2376 continue; 2377 2378 if (!SO->second.front().Method->isPure()) 2379 continue; 2380 2381 if (!SeenPureMethods.insert(SO->second.front().Method)) 2382 continue; 2383 2384 Diag(SO->second.front().Method->getLocation(), 2385 diag::note_pure_virtual_function) 2386 << SO->second.front().Method->getDeclName(); 2387 } 2388 } 2389 2390 if (!PureVirtualClassDiagSet) 2391 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2392 PureVirtualClassDiagSet->insert(RD); 2393 2394 return true; 2395} 2396 2397namespace { 2398 class AbstractClassUsageDiagnoser 2399 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 2400 Sema &SemaRef; 2401 CXXRecordDecl *AbstractClass; 2402 2403 bool VisitDeclContext(const DeclContext *DC) { 2404 bool Invalid = false; 2405 2406 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 2407 E = DC->decls_end(); I != E; ++I) 2408 Invalid |= Visit(*I); 2409 2410 return Invalid; 2411 } 2412 2413 public: 2414 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 2415 : SemaRef(SemaRef), AbstractClass(ac) { 2416 Visit(SemaRef.Context.getTranslationUnitDecl()); 2417 } 2418 2419 bool VisitFunctionDecl(const FunctionDecl *FD) { 2420 if (FD->isThisDeclarationADefinition()) { 2421 // No need to do the check if we're in a definition, because it requires 2422 // that the return/param types are complete. 2423 // because that requires 2424 return VisitDeclContext(FD); 2425 } 2426 2427 // Check the return type. 2428 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 2429 bool Invalid = 2430 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 2431 diag::err_abstract_type_in_decl, 2432 Sema::AbstractReturnType, 2433 AbstractClass); 2434 2435 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 2436 E = FD->param_end(); I != E; ++I) { 2437 const ParmVarDecl *VD = *I; 2438 Invalid |= 2439 SemaRef.RequireNonAbstractType(VD->getLocation(), 2440 VD->getOriginalType(), 2441 diag::err_abstract_type_in_decl, 2442 Sema::AbstractParamType, 2443 AbstractClass); 2444 } 2445 2446 return Invalid; 2447 } 2448 2449 bool VisitDecl(const Decl* D) { 2450 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 2451 return VisitDeclContext(DC); 2452 2453 return false; 2454 } 2455 }; 2456} 2457 2458/// \brief Perform semantic checks on a class definition that has been 2459/// completing, introducing implicitly-declared members, checking for 2460/// abstract types, etc. 2461void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2462 if (!Record || Record->isInvalidDecl()) 2463 return; 2464 2465 if (!Record->isDependentType()) 2466 AddImplicitlyDeclaredMembersToClass(Record); 2467 2468 if (Record->isInvalidDecl()) 2469 return; 2470 2471 // Set access bits correctly on the directly-declared conversions. 2472 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2473 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2474 Convs->setAccess(I, (*I)->getAccess()); 2475 2476 // Determine whether we need to check for final overriders. We do 2477 // this either when there are virtual base classes (in which case we 2478 // may end up finding multiple final overriders for a given virtual 2479 // function) or any of the base classes is abstract (in which case 2480 // we might detect that this class is abstract). 2481 bool CheckFinalOverriders = false; 2482 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2483 !Record->isDependentType()) { 2484 if (Record->getNumVBases()) 2485 CheckFinalOverriders = true; 2486 else if (!Record->isAbstract()) { 2487 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2488 BEnd = Record->bases_end(); 2489 B != BEnd; ++B) { 2490 CXXRecordDecl *BaseDecl 2491 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2492 if (BaseDecl->isAbstract()) { 2493 CheckFinalOverriders = true; 2494 break; 2495 } 2496 } 2497 } 2498 } 2499 2500 if (CheckFinalOverriders) { 2501 CXXFinalOverriderMap FinalOverriders; 2502 Record->getFinalOverriders(FinalOverriders); 2503 2504 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2505 MEnd = FinalOverriders.end(); 2506 M != MEnd; ++M) { 2507 for (OverridingMethods::iterator SO = M->second.begin(), 2508 SOEnd = M->second.end(); 2509 SO != SOEnd; ++SO) { 2510 assert(SO->second.size() > 0 && 2511 "All virtual functions have overridding virtual functions"); 2512 if (SO->second.size() == 1) { 2513 // C++ [class.abstract]p4: 2514 // A class is abstract if it contains or inherits at least one 2515 // pure virtual function for which the final overrider is pure 2516 // virtual. 2517 if (SO->second.front().Method->isPure()) 2518 Record->setAbstract(true); 2519 continue; 2520 } 2521 2522 // C++ [class.virtual]p2: 2523 // In a derived class, if a virtual member function of a base 2524 // class subobject has more than one final overrider the 2525 // program is ill-formed. 2526 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2527 << (NamedDecl *)M->first << Record; 2528 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2529 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2530 OMEnd = SO->second.end(); 2531 OM != OMEnd; ++OM) 2532 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2533 << (NamedDecl *)M->first << OM->Method->getParent(); 2534 2535 Record->setInvalidDecl(); 2536 } 2537 } 2538 } 2539 2540 if (Record->isAbstract() && !Record->isInvalidDecl()) 2541 (void)AbstractClassUsageDiagnoser(*this, Record); 2542 2543 // If this is not an aggregate type and has no user-declared constructor, 2544 // complain about any non-static data members of reference or const scalar 2545 // type, since they will never get initializers. 2546 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2547 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2548 bool Complained = false; 2549 for (RecordDecl::field_iterator F = Record->field_begin(), 2550 FEnd = Record->field_end(); 2551 F != FEnd; ++F) { 2552 if (F->getType()->isReferenceType() || 2553 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2554 if (!Complained) { 2555 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2556 << Record->getTagKind() << Record; 2557 Complained = true; 2558 } 2559 2560 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2561 << F->getType()->isReferenceType() 2562 << F->getDeclName(); 2563 } 2564 } 2565 } 2566 2567 if (Record->isDynamicClass()) 2568 DynamicClasses.push_back(Record); 2569} 2570 2571void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2572 DeclPtrTy TagDecl, 2573 SourceLocation LBrac, 2574 SourceLocation RBrac, 2575 AttributeList *AttrList) { 2576 if (!TagDecl) 2577 return; 2578 2579 AdjustDeclIfTemplate(TagDecl); 2580 2581 ActOnFields(S, RLoc, TagDecl, 2582 (DeclPtrTy*)FieldCollector->getCurFields(), 2583 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2584 2585 CheckCompletedCXXClass( 2586 dyn_cast_or_null<CXXRecordDecl>(TagDecl.getAs<Decl>())); 2587} 2588 2589namespace { 2590 /// \brief Helper class that collects exception specifications for 2591 /// implicitly-declared special member functions. 2592 class ImplicitExceptionSpecification { 2593 ASTContext &Context; 2594 bool AllowsAllExceptions; 2595 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2596 llvm::SmallVector<QualType, 4> Exceptions; 2597 2598 public: 2599 explicit ImplicitExceptionSpecification(ASTContext &Context) 2600 : Context(Context), AllowsAllExceptions(false) { } 2601 2602 /// \brief Whether the special member function should have any 2603 /// exception specification at all. 2604 bool hasExceptionSpecification() const { 2605 return !AllowsAllExceptions; 2606 } 2607 2608 /// \brief Whether the special member function should have a 2609 /// throw(...) exception specification (a Microsoft extension). 2610 bool hasAnyExceptionSpecification() const { 2611 return false; 2612 } 2613 2614 /// \brief The number of exceptions in the exception specification. 2615 unsigned size() const { return Exceptions.size(); } 2616 2617 /// \brief The set of exceptions in the exception specification. 2618 const QualType *data() const { return Exceptions.data(); } 2619 2620 /// \brief Note that 2621 void CalledDecl(CXXMethodDecl *Method) { 2622 // If we already know that we allow all exceptions, do nothing. 2623 if (AllowsAllExceptions || !Method) 2624 return; 2625 2626 const FunctionProtoType *Proto 2627 = Method->getType()->getAs<FunctionProtoType>(); 2628 2629 // If this function can throw any exceptions, make a note of that. 2630 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2631 AllowsAllExceptions = true; 2632 ExceptionsSeen.clear(); 2633 Exceptions.clear(); 2634 return; 2635 } 2636 2637 // Record the exceptions in this function's exception specification. 2638 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2639 EEnd = Proto->exception_end(); 2640 E != EEnd; ++E) 2641 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2642 Exceptions.push_back(*E); 2643 } 2644 }; 2645} 2646 2647 2648/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2649/// special functions, such as the default constructor, copy 2650/// constructor, or destructor, to the given C++ class (C++ 2651/// [special]p1). This routine can only be executed just before the 2652/// definition of the class is complete. 2653void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2654 if (!ClassDecl->hasUserDeclaredConstructor()) 2655 ++ASTContext::NumImplicitDefaultConstructors; 2656 2657 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2658 ++ASTContext::NumImplicitCopyConstructors; 2659 2660 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2661 ++ASTContext::NumImplicitCopyAssignmentOperators; 2662 2663 // If we have a dynamic class, then the copy assignment operator may be 2664 // virtual, so we have to declare it immediately. This ensures that, e.g., 2665 // it shows up in the right place in the vtable and that we diagnose 2666 // problems with the implicit exception specification. 2667 if (ClassDecl->isDynamicClass()) 2668 DeclareImplicitCopyAssignment(ClassDecl); 2669 } 2670 2671 if (!ClassDecl->hasUserDeclaredDestructor()) { 2672 ++ASTContext::NumImplicitDestructors; 2673 2674 // If we have a dynamic class, then the destructor may be virtual, so we 2675 // have to declare the destructor immediately. This ensures that, e.g., it 2676 // shows up in the right place in the vtable and that we diagnose problems 2677 // with the implicit exception specification. 2678 if (ClassDecl->isDynamicClass()) 2679 DeclareImplicitDestructor(ClassDecl); 2680 } 2681} 2682 2683void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2684 Decl *D = TemplateD.getAs<Decl>(); 2685 if (!D) 2686 return; 2687 2688 TemplateParameterList *Params = 0; 2689 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2690 Params = Template->getTemplateParameters(); 2691 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2692 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2693 Params = PartialSpec->getTemplateParameters(); 2694 else 2695 return; 2696 2697 for (TemplateParameterList::iterator Param = Params->begin(), 2698 ParamEnd = Params->end(); 2699 Param != ParamEnd; ++Param) { 2700 NamedDecl *Named = cast<NamedDecl>(*Param); 2701 if (Named->getDeclName()) { 2702 S->AddDecl(DeclPtrTy::make(Named)); 2703 IdResolver.AddDecl(Named); 2704 } 2705 } 2706} 2707 2708void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2709 if (!RecordD) return; 2710 AdjustDeclIfTemplate(RecordD); 2711 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD.getAs<Decl>()); 2712 PushDeclContext(S, Record); 2713} 2714 2715void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, DeclPtrTy RecordD) { 2716 if (!RecordD) return; 2717 PopDeclContext(); 2718} 2719 2720/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2721/// parsing a top-level (non-nested) C++ class, and we are now 2722/// parsing those parts of the given Method declaration that could 2723/// not be parsed earlier (C++ [class.mem]p2), such as default 2724/// arguments. This action should enter the scope of the given 2725/// Method declaration as if we had just parsed the qualified method 2726/// name. However, it should not bring the parameters into scope; 2727/// that will be performed by ActOnDelayedCXXMethodParameter. 2728void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2729} 2730 2731/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2732/// C++ method declaration. We're (re-)introducing the given 2733/// function parameter into scope for use in parsing later parts of 2734/// the method declaration. For example, we could see an 2735/// ActOnParamDefaultArgument event for this parameter. 2736void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2737 if (!ParamD) 2738 return; 2739 2740 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2741 2742 // If this parameter has an unparsed default argument, clear it out 2743 // to make way for the parsed default argument. 2744 if (Param->hasUnparsedDefaultArg()) 2745 Param->setDefaultArg(0); 2746 2747 S->AddDecl(DeclPtrTy::make(Param)); 2748 if (Param->getDeclName()) 2749 IdResolver.AddDecl(Param); 2750} 2751 2752/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2753/// processing the delayed method declaration for Method. The method 2754/// declaration is now considered finished. There may be a separate 2755/// ActOnStartOfFunctionDef action later (not necessarily 2756/// immediately!) for this method, if it was also defined inside the 2757/// class body. 2758void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2759 if (!MethodD) 2760 return; 2761 2762 AdjustDeclIfTemplate(MethodD); 2763 2764 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2765 2766 // Now that we have our default arguments, check the constructor 2767 // again. It could produce additional diagnostics or affect whether 2768 // the class has implicitly-declared destructors, among other 2769 // things. 2770 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2771 CheckConstructor(Constructor); 2772 2773 // Check the default arguments, which we may have added. 2774 if (!Method->isInvalidDecl()) 2775 CheckCXXDefaultArguments(Method); 2776} 2777 2778/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2779/// the well-formedness of the constructor declarator @p D with type @p 2780/// R. If there are any errors in the declarator, this routine will 2781/// emit diagnostics and set the invalid bit to true. In any case, the type 2782/// will be updated to reflect a well-formed type for the constructor and 2783/// returned. 2784QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2785 FunctionDecl::StorageClass &SC) { 2786 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2787 2788 // C++ [class.ctor]p3: 2789 // A constructor shall not be virtual (10.3) or static (9.4). A 2790 // constructor can be invoked for a const, volatile or const 2791 // volatile object. A constructor shall not be declared const, 2792 // volatile, or const volatile (9.3.2). 2793 if (isVirtual) { 2794 if (!D.isInvalidType()) 2795 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2796 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2797 << SourceRange(D.getIdentifierLoc()); 2798 D.setInvalidType(); 2799 } 2800 if (SC == FunctionDecl::Static) { 2801 if (!D.isInvalidType()) 2802 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2803 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2804 << SourceRange(D.getIdentifierLoc()); 2805 D.setInvalidType(); 2806 SC = FunctionDecl::None; 2807 } 2808 2809 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2810 if (FTI.TypeQuals != 0) { 2811 if (FTI.TypeQuals & Qualifiers::Const) 2812 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2813 << "const" << SourceRange(D.getIdentifierLoc()); 2814 if (FTI.TypeQuals & Qualifiers::Volatile) 2815 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2816 << "volatile" << SourceRange(D.getIdentifierLoc()); 2817 if (FTI.TypeQuals & Qualifiers::Restrict) 2818 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2819 << "restrict" << SourceRange(D.getIdentifierLoc()); 2820 } 2821 2822 // Rebuild the function type "R" without any type qualifiers (in 2823 // case any of the errors above fired) and with "void" as the 2824 // return type, since constructors don't have return types. 2825 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2826 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2827 Proto->getNumArgs(), 2828 Proto->isVariadic(), 0, 2829 Proto->hasExceptionSpec(), 2830 Proto->hasAnyExceptionSpec(), 2831 Proto->getNumExceptions(), 2832 Proto->exception_begin(), 2833 Proto->getExtInfo()); 2834} 2835 2836/// CheckConstructor - Checks a fully-formed constructor for 2837/// well-formedness, issuing any diagnostics required. Returns true if 2838/// the constructor declarator is invalid. 2839void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2840 CXXRecordDecl *ClassDecl 2841 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2842 if (!ClassDecl) 2843 return Constructor->setInvalidDecl(); 2844 2845 // C++ [class.copy]p3: 2846 // A declaration of a constructor for a class X is ill-formed if 2847 // its first parameter is of type (optionally cv-qualified) X and 2848 // either there are no other parameters or else all other 2849 // parameters have default arguments. 2850 if (!Constructor->isInvalidDecl() && 2851 ((Constructor->getNumParams() == 1) || 2852 (Constructor->getNumParams() > 1 && 2853 Constructor->getParamDecl(1)->hasDefaultArg())) && 2854 Constructor->getTemplateSpecializationKind() 2855 != TSK_ImplicitInstantiation) { 2856 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2857 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2858 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2859 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2860 const char *ConstRef 2861 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2862 : " const &"; 2863 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2864 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 2865 2866 // FIXME: Rather that making the constructor invalid, we should endeavor 2867 // to fix the type. 2868 Constructor->setInvalidDecl(); 2869 } 2870 } 2871 2872 // Notify the class that we've added a constructor. In principle we 2873 // don't need to do this for out-of-line declarations; in practice 2874 // we only instantiate the most recent declaration of a method, so 2875 // we have to call this for everything but friends. 2876 if (!Constructor->getFriendObjectKind()) 2877 ClassDecl->addedConstructor(Context, Constructor); 2878} 2879 2880/// CheckDestructor - Checks a fully-formed destructor for well-formedness, 2881/// issuing any diagnostics required. Returns true on error. 2882bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2883 CXXRecordDecl *RD = Destructor->getParent(); 2884 2885 if (Destructor->isVirtual()) { 2886 SourceLocation Loc; 2887 2888 if (!Destructor->isImplicit()) 2889 Loc = Destructor->getLocation(); 2890 else 2891 Loc = RD->getLocation(); 2892 2893 // If we have a virtual destructor, look up the deallocation function 2894 FunctionDecl *OperatorDelete = 0; 2895 DeclarationName Name = 2896 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2897 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2898 return true; 2899 2900 MarkDeclarationReferenced(Loc, OperatorDelete); 2901 2902 Destructor->setOperatorDelete(OperatorDelete); 2903 } 2904 2905 return false; 2906} 2907 2908static inline bool 2909FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2910 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2911 FTI.ArgInfo[0].Param && 2912 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2913} 2914 2915/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2916/// the well-formednes of the destructor declarator @p D with type @p 2917/// R. If there are any errors in the declarator, this routine will 2918/// emit diagnostics and set the declarator to invalid. Even if this happens, 2919/// will be updated to reflect a well-formed type for the destructor and 2920/// returned. 2921QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 2922 FunctionDecl::StorageClass& SC) { 2923 // C++ [class.dtor]p1: 2924 // [...] A typedef-name that names a class is a class-name 2925 // (7.1.3); however, a typedef-name that names a class shall not 2926 // be used as the identifier in the declarator for a destructor 2927 // declaration. 2928 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2929 if (isa<TypedefType>(DeclaratorType)) 2930 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2931 << DeclaratorType; 2932 2933 // C++ [class.dtor]p2: 2934 // A destructor is used to destroy objects of its class type. A 2935 // destructor takes no parameters, and no return type can be 2936 // specified for it (not even void). The address of a destructor 2937 // shall not be taken. A destructor shall not be static. A 2938 // destructor can be invoked for a const, volatile or const 2939 // volatile object. A destructor shall not be declared const, 2940 // volatile or const volatile (9.3.2). 2941 if (SC == FunctionDecl::Static) { 2942 if (!D.isInvalidType()) 2943 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2944 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2945 << SourceRange(D.getIdentifierLoc()) 2946 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2947 2948 SC = FunctionDecl::None; 2949 } 2950 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2951 // Destructors don't have return types, but the parser will 2952 // happily parse something like: 2953 // 2954 // class X { 2955 // float ~X(); 2956 // }; 2957 // 2958 // The return type will be eliminated later. 2959 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2960 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2961 << SourceRange(D.getIdentifierLoc()); 2962 } 2963 2964 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2965 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2966 if (FTI.TypeQuals & Qualifiers::Const) 2967 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2968 << "const" << SourceRange(D.getIdentifierLoc()); 2969 if (FTI.TypeQuals & Qualifiers::Volatile) 2970 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2971 << "volatile" << SourceRange(D.getIdentifierLoc()); 2972 if (FTI.TypeQuals & Qualifiers::Restrict) 2973 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2974 << "restrict" << SourceRange(D.getIdentifierLoc()); 2975 D.setInvalidType(); 2976 } 2977 2978 // Make sure we don't have any parameters. 2979 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2980 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2981 2982 // Delete the parameters. 2983 FTI.freeArgs(); 2984 D.setInvalidType(); 2985 } 2986 2987 // Make sure the destructor isn't variadic. 2988 if (FTI.isVariadic) { 2989 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2990 D.setInvalidType(); 2991 } 2992 2993 // Rebuild the function type "R" without any type qualifiers or 2994 // parameters (in case any of the errors above fired) and with 2995 // "void" as the return type, since destructors don't have return 2996 // types. 2997 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2998 if (!Proto) 2999 return QualType(); 3000 3001 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3002 Proto->hasExceptionSpec(), 3003 Proto->hasAnyExceptionSpec(), 3004 Proto->getNumExceptions(), 3005 Proto->exception_begin(), 3006 Proto->getExtInfo()); 3007} 3008 3009/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3010/// well-formednes of the conversion function declarator @p D with 3011/// type @p R. If there are any errors in the declarator, this routine 3012/// will emit diagnostics and return true. Otherwise, it will return 3013/// false. Either way, the type @p R will be updated to reflect a 3014/// well-formed type for the conversion operator. 3015void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3016 FunctionDecl::StorageClass& SC) { 3017 // C++ [class.conv.fct]p1: 3018 // Neither parameter types nor return type can be specified. The 3019 // type of a conversion function (8.3.5) is "function taking no 3020 // parameter returning conversion-type-id." 3021 if (SC == FunctionDecl::Static) { 3022 if (!D.isInvalidType()) 3023 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3024 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3025 << SourceRange(D.getIdentifierLoc()); 3026 D.setInvalidType(); 3027 SC = FunctionDecl::None; 3028 } 3029 3030 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3031 3032 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3033 // Conversion functions don't have return types, but the parser will 3034 // happily parse something like: 3035 // 3036 // class X { 3037 // float operator bool(); 3038 // }; 3039 // 3040 // The return type will be changed later anyway. 3041 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3042 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3043 << SourceRange(D.getIdentifierLoc()); 3044 D.setInvalidType(); 3045 } 3046 3047 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3048 3049 // Make sure we don't have any parameters. 3050 if (Proto->getNumArgs() > 0) { 3051 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3052 3053 // Delete the parameters. 3054 D.getTypeObject(0).Fun.freeArgs(); 3055 D.setInvalidType(); 3056 } else if (Proto->isVariadic()) { 3057 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3058 D.setInvalidType(); 3059 } 3060 3061 // Diagnose "&operator bool()" and other such nonsense. This 3062 // is actually a gcc extension which we don't support. 3063 if (Proto->getResultType() != ConvType) { 3064 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3065 << Proto->getResultType(); 3066 D.setInvalidType(); 3067 ConvType = Proto->getResultType(); 3068 } 3069 3070 // C++ [class.conv.fct]p4: 3071 // The conversion-type-id shall not represent a function type nor 3072 // an array type. 3073 if (ConvType->isArrayType()) { 3074 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3075 ConvType = Context.getPointerType(ConvType); 3076 D.setInvalidType(); 3077 } else if (ConvType->isFunctionType()) { 3078 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3079 ConvType = Context.getPointerType(ConvType); 3080 D.setInvalidType(); 3081 } 3082 3083 // Rebuild the function type "R" without any parameters (in case any 3084 // of the errors above fired) and with the conversion type as the 3085 // return type. 3086 if (D.isInvalidType()) { 3087 R = Context.getFunctionType(ConvType, 0, 0, false, 3088 Proto->getTypeQuals(), 3089 Proto->hasExceptionSpec(), 3090 Proto->hasAnyExceptionSpec(), 3091 Proto->getNumExceptions(), 3092 Proto->exception_begin(), 3093 Proto->getExtInfo()); 3094 } 3095 3096 // C++0x explicit conversion operators. 3097 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3098 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3099 diag::warn_explicit_conversion_functions) 3100 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3101} 3102 3103/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3104/// the declaration of the given C++ conversion function. This routine 3105/// is responsible for recording the conversion function in the C++ 3106/// class, if possible. 3107Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3108 assert(Conversion && "Expected to receive a conversion function declaration"); 3109 3110 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3111 3112 // Make sure we aren't redeclaring the conversion function. 3113 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3114 3115 // C++ [class.conv.fct]p1: 3116 // [...] A conversion function is never used to convert a 3117 // (possibly cv-qualified) object to the (possibly cv-qualified) 3118 // same object type (or a reference to it), to a (possibly 3119 // cv-qualified) base class of that type (or a reference to it), 3120 // or to (possibly cv-qualified) void. 3121 // FIXME: Suppress this warning if the conversion function ends up being a 3122 // virtual function that overrides a virtual function in a base class. 3123 QualType ClassType 3124 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3125 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3126 ConvType = ConvTypeRef->getPointeeType(); 3127 if (ConvType->isRecordType()) { 3128 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3129 if (ConvType == ClassType) 3130 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3131 << ClassType; 3132 else if (IsDerivedFrom(ClassType, ConvType)) 3133 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3134 << ClassType << ConvType; 3135 } else if (ConvType->isVoidType()) { 3136 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3137 << ClassType << ConvType; 3138 } 3139 3140 if (Conversion->getPrimaryTemplate()) { 3141 // ignore specializations 3142 } else if (Conversion->getPreviousDeclaration()) { 3143 if (FunctionTemplateDecl *ConversionTemplate 3144 = Conversion->getDescribedFunctionTemplate()) { 3145 if (ClassDecl->replaceConversion( 3146 ConversionTemplate->getPreviousDeclaration(), 3147 ConversionTemplate)) 3148 return DeclPtrTy::make(ConversionTemplate); 3149 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3150 Conversion)) 3151 return DeclPtrTy::make(Conversion); 3152 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3153 } else if (FunctionTemplateDecl *ConversionTemplate 3154 = Conversion->getDescribedFunctionTemplate()) 3155 ClassDecl->addConversionFunction(ConversionTemplate); 3156 else 3157 ClassDecl->addConversionFunction(Conversion); 3158 3159 return DeclPtrTy::make(Conversion); 3160} 3161 3162//===----------------------------------------------------------------------===// 3163// Namespace Handling 3164//===----------------------------------------------------------------------===// 3165 3166/// ActOnStartNamespaceDef - This is called at the start of a namespace 3167/// definition. 3168Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3169 SourceLocation IdentLoc, 3170 IdentifierInfo *II, 3171 SourceLocation LBrace, 3172 AttributeList *AttrList) { 3173 NamespaceDecl *Namespc = 3174 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 3175 Namespc->setLBracLoc(LBrace); 3176 3177 Scope *DeclRegionScope = NamespcScope->getParent(); 3178 3179 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3180 3181 if (II) { 3182 // C++ [namespace.def]p2: 3183 // The identifier in an original-namespace-definition shall not have been 3184 // previously defined in the declarative region in which the 3185 // original-namespace-definition appears. The identifier in an 3186 // original-namespace-definition is the name of the namespace. Subsequently 3187 // in that declarative region, it is treated as an original-namespace-name. 3188 3189 NamedDecl *PrevDecl 3190 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3191 ForRedeclaration); 3192 3193 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3194 // This is an extended namespace definition. 3195 // Attach this namespace decl to the chain of extended namespace 3196 // definitions. 3197 OrigNS->setNextNamespace(Namespc); 3198 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3199 3200 // Remove the previous declaration from the scope. 3201 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 3202 IdResolver.RemoveDecl(OrigNS); 3203 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 3204 } 3205 } else if (PrevDecl) { 3206 // This is an invalid name redefinition. 3207 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3208 << Namespc->getDeclName(); 3209 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3210 Namespc->setInvalidDecl(); 3211 // Continue on to push Namespc as current DeclContext and return it. 3212 } else if (II->isStr("std") && 3213 CurContext->getLookupContext()->isTranslationUnit()) { 3214 // This is the first "real" definition of the namespace "std", so update 3215 // our cache of the "std" namespace to point at this definition. 3216 if (StdNamespace) { 3217 // We had already defined a dummy namespace "std". Link this new 3218 // namespace definition to the dummy namespace "std". 3219 StdNamespace->setNextNamespace(Namespc); 3220 StdNamespace->setLocation(IdentLoc); 3221 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 3222 } 3223 3224 // Make our StdNamespace cache point at the first real definition of the 3225 // "std" namespace. 3226 StdNamespace = Namespc; 3227 } 3228 3229 PushOnScopeChains(Namespc, DeclRegionScope); 3230 } else { 3231 // Anonymous namespaces. 3232 assert(Namespc->isAnonymousNamespace()); 3233 3234 // Link the anonymous namespace into its parent. 3235 NamespaceDecl *PrevDecl; 3236 DeclContext *Parent = CurContext->getLookupContext(); 3237 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3238 PrevDecl = TU->getAnonymousNamespace(); 3239 TU->setAnonymousNamespace(Namespc); 3240 } else { 3241 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3242 PrevDecl = ND->getAnonymousNamespace(); 3243 ND->setAnonymousNamespace(Namespc); 3244 } 3245 3246 // Link the anonymous namespace with its previous declaration. 3247 if (PrevDecl) { 3248 assert(PrevDecl->isAnonymousNamespace()); 3249 assert(!PrevDecl->getNextNamespace()); 3250 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3251 PrevDecl->setNextNamespace(Namespc); 3252 } 3253 3254 CurContext->addDecl(Namespc); 3255 3256 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3257 // behaves as if it were replaced by 3258 // namespace unique { /* empty body */ } 3259 // using namespace unique; 3260 // namespace unique { namespace-body } 3261 // where all occurrences of 'unique' in a translation unit are 3262 // replaced by the same identifier and this identifier differs 3263 // from all other identifiers in the entire program. 3264 3265 // We just create the namespace with an empty name and then add an 3266 // implicit using declaration, just like the standard suggests. 3267 // 3268 // CodeGen enforces the "universally unique" aspect by giving all 3269 // declarations semantically contained within an anonymous 3270 // namespace internal linkage. 3271 3272 if (!PrevDecl) { 3273 UsingDirectiveDecl* UD 3274 = UsingDirectiveDecl::Create(Context, CurContext, 3275 /* 'using' */ LBrace, 3276 /* 'namespace' */ SourceLocation(), 3277 /* qualifier */ SourceRange(), 3278 /* NNS */ NULL, 3279 /* identifier */ SourceLocation(), 3280 Namespc, 3281 /* Ancestor */ CurContext); 3282 UD->setImplicit(); 3283 CurContext->addDecl(UD); 3284 } 3285 } 3286 3287 // Although we could have an invalid decl (i.e. the namespace name is a 3288 // redefinition), push it as current DeclContext and try to continue parsing. 3289 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3290 // for the namespace has the declarations that showed up in that particular 3291 // namespace definition. 3292 PushDeclContext(NamespcScope, Namespc); 3293 return DeclPtrTy::make(Namespc); 3294} 3295 3296/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3297/// is a namespace alias, returns the namespace it points to. 3298static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3299 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3300 return AD->getNamespace(); 3301 return dyn_cast_or_null<NamespaceDecl>(D); 3302} 3303 3304/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3305/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3306void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 3307 Decl *Dcl = D.getAs<Decl>(); 3308 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3309 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3310 Namespc->setRBracLoc(RBrace); 3311 PopDeclContext(); 3312} 3313 3314/// \brief Retrieve the special "std" namespace, which may require us to 3315/// implicitly define the namespace. 3316NamespaceDecl *Sema::getOrCreateStdNamespace() { 3317 if (!StdNamespace) { 3318 // The "std" namespace has not yet been defined, so build one implicitly. 3319 StdNamespace = NamespaceDecl::Create(Context, 3320 Context.getTranslationUnitDecl(), 3321 SourceLocation(), 3322 &PP.getIdentifierTable().get("std")); 3323 StdNamespace->setImplicit(true); 3324 } 3325 3326 return StdNamespace; 3327} 3328 3329Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 3330 SourceLocation UsingLoc, 3331 SourceLocation NamespcLoc, 3332 CXXScopeSpec &SS, 3333 SourceLocation IdentLoc, 3334 IdentifierInfo *NamespcName, 3335 AttributeList *AttrList) { 3336 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3337 assert(NamespcName && "Invalid NamespcName."); 3338 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3339 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3340 3341 UsingDirectiveDecl *UDir = 0; 3342 NestedNameSpecifier *Qualifier = 0; 3343 if (SS.isSet()) 3344 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3345 3346 // Lookup namespace name. 3347 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3348 LookupParsedName(R, S, &SS); 3349 if (R.isAmbiguous()) 3350 return DeclPtrTy(); 3351 3352 if (R.empty()) { 3353 // Allow "using namespace std;" or "using namespace ::std;" even if 3354 // "std" hasn't been defined yet, for GCC compatibility. 3355 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3356 NamespcName->isStr("std")) { 3357 Diag(IdentLoc, diag::ext_using_undefined_std); 3358 R.addDecl(getOrCreateStdNamespace()); 3359 R.resolveKind(); 3360 } 3361 // Otherwise, attempt typo correction. 3362 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3363 CTC_NoKeywords, 0)) { 3364 if (R.getAsSingle<NamespaceDecl>() || 3365 R.getAsSingle<NamespaceAliasDecl>()) { 3366 if (DeclContext *DC = computeDeclContext(SS, false)) 3367 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3368 << NamespcName << DC << Corrected << SS.getRange() 3369 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3370 else 3371 Diag(IdentLoc, diag::err_using_directive_suggest) 3372 << NamespcName << Corrected 3373 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3374 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3375 << Corrected; 3376 3377 NamespcName = Corrected.getAsIdentifierInfo(); 3378 } else { 3379 R.clear(); 3380 R.setLookupName(NamespcName); 3381 } 3382 } 3383 } 3384 3385 if (!R.empty()) { 3386 NamedDecl *Named = R.getFoundDecl(); 3387 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3388 && "expected namespace decl"); 3389 // C++ [namespace.udir]p1: 3390 // A using-directive specifies that the names in the nominated 3391 // namespace can be used in the scope in which the 3392 // using-directive appears after the using-directive. During 3393 // unqualified name lookup (3.4.1), the names appear as if they 3394 // were declared in the nearest enclosing namespace which 3395 // contains both the using-directive and the nominated 3396 // namespace. [Note: in this context, "contains" means "contains 3397 // directly or indirectly". ] 3398 3399 // Find enclosing context containing both using-directive and 3400 // nominated namespace. 3401 NamespaceDecl *NS = getNamespaceDecl(Named); 3402 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3403 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3404 CommonAncestor = CommonAncestor->getParent(); 3405 3406 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3407 SS.getRange(), 3408 (NestedNameSpecifier *)SS.getScopeRep(), 3409 IdentLoc, Named, CommonAncestor); 3410 PushUsingDirective(S, UDir); 3411 } else { 3412 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3413 } 3414 3415 // FIXME: We ignore attributes for now. 3416 delete AttrList; 3417 return DeclPtrTy::make(UDir); 3418} 3419 3420void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3421 // If scope has associated entity, then using directive is at namespace 3422 // or translation unit scope. We add UsingDirectiveDecls, into 3423 // it's lookup structure. 3424 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3425 Ctx->addDecl(UDir); 3426 else 3427 // Otherwise it is block-sope. using-directives will affect lookup 3428 // only to the end of scope. 3429 S->PushUsingDirective(DeclPtrTy::make(UDir)); 3430} 3431 3432 3433Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 3434 AccessSpecifier AS, 3435 bool HasUsingKeyword, 3436 SourceLocation UsingLoc, 3437 CXXScopeSpec &SS, 3438 UnqualifiedId &Name, 3439 AttributeList *AttrList, 3440 bool IsTypeName, 3441 SourceLocation TypenameLoc) { 3442 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3443 3444 switch (Name.getKind()) { 3445 case UnqualifiedId::IK_Identifier: 3446 case UnqualifiedId::IK_OperatorFunctionId: 3447 case UnqualifiedId::IK_LiteralOperatorId: 3448 case UnqualifiedId::IK_ConversionFunctionId: 3449 break; 3450 3451 case UnqualifiedId::IK_ConstructorName: 3452 case UnqualifiedId::IK_ConstructorTemplateId: 3453 // C++0x inherited constructors. 3454 if (getLangOptions().CPlusPlus0x) break; 3455 3456 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3457 << SS.getRange(); 3458 return DeclPtrTy(); 3459 3460 case UnqualifiedId::IK_DestructorName: 3461 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3462 << SS.getRange(); 3463 return DeclPtrTy(); 3464 3465 case UnqualifiedId::IK_TemplateId: 3466 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3467 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3468 return DeclPtrTy(); 3469 } 3470 3471 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 3472 if (!TargetName) 3473 return DeclPtrTy(); 3474 3475 // Warn about using declarations. 3476 // TODO: store that the declaration was written without 'using' and 3477 // talk about access decls instead of using decls in the 3478 // diagnostics. 3479 if (!HasUsingKeyword) { 3480 UsingLoc = Name.getSourceRange().getBegin(); 3481 3482 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3483 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3484 } 3485 3486 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3487 Name.getSourceRange().getBegin(), 3488 TargetName, AttrList, 3489 /* IsInstantiation */ false, 3490 IsTypeName, TypenameLoc); 3491 if (UD) 3492 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3493 3494 return DeclPtrTy::make(UD); 3495} 3496 3497/// \brief Determine whether a using declaration considers the given 3498/// declarations as "equivalent", e.g., if they are redeclarations of 3499/// the same entity or are both typedefs of the same type. 3500static bool 3501IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3502 bool &SuppressRedeclaration) { 3503 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3504 SuppressRedeclaration = false; 3505 return true; 3506 } 3507 3508 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3509 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3510 SuppressRedeclaration = true; 3511 return Context.hasSameType(TD1->getUnderlyingType(), 3512 TD2->getUnderlyingType()); 3513 } 3514 3515 return false; 3516} 3517 3518 3519/// Determines whether to create a using shadow decl for a particular 3520/// decl, given the set of decls existing prior to this using lookup. 3521bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3522 const LookupResult &Previous) { 3523 // Diagnose finding a decl which is not from a base class of the 3524 // current class. We do this now because there are cases where this 3525 // function will silently decide not to build a shadow decl, which 3526 // will pre-empt further diagnostics. 3527 // 3528 // We don't need to do this in C++0x because we do the check once on 3529 // the qualifier. 3530 // 3531 // FIXME: diagnose the following if we care enough: 3532 // struct A { int foo; }; 3533 // struct B : A { using A::foo; }; 3534 // template <class T> struct C : A {}; 3535 // template <class T> struct D : C<T> { using B::foo; } // <--- 3536 // This is invalid (during instantiation) in C++03 because B::foo 3537 // resolves to the using decl in B, which is not a base class of D<T>. 3538 // We can't diagnose it immediately because C<T> is an unknown 3539 // specialization. The UsingShadowDecl in D<T> then points directly 3540 // to A::foo, which will look well-formed when we instantiate. 3541 // The right solution is to not collapse the shadow-decl chain. 3542 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3543 DeclContext *OrigDC = Orig->getDeclContext(); 3544 3545 // Handle enums and anonymous structs. 3546 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3547 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3548 while (OrigRec->isAnonymousStructOrUnion()) 3549 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3550 3551 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3552 if (OrigDC == CurContext) { 3553 Diag(Using->getLocation(), 3554 diag::err_using_decl_nested_name_specifier_is_current_class) 3555 << Using->getNestedNameRange(); 3556 Diag(Orig->getLocation(), diag::note_using_decl_target); 3557 return true; 3558 } 3559 3560 Diag(Using->getNestedNameRange().getBegin(), 3561 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3562 << Using->getTargetNestedNameDecl() 3563 << cast<CXXRecordDecl>(CurContext) 3564 << Using->getNestedNameRange(); 3565 Diag(Orig->getLocation(), diag::note_using_decl_target); 3566 return true; 3567 } 3568 } 3569 3570 if (Previous.empty()) return false; 3571 3572 NamedDecl *Target = Orig; 3573 if (isa<UsingShadowDecl>(Target)) 3574 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3575 3576 // If the target happens to be one of the previous declarations, we 3577 // don't have a conflict. 3578 // 3579 // FIXME: but we might be increasing its access, in which case we 3580 // should redeclare it. 3581 NamedDecl *NonTag = 0, *Tag = 0; 3582 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3583 I != E; ++I) { 3584 NamedDecl *D = (*I)->getUnderlyingDecl(); 3585 bool Result; 3586 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3587 return Result; 3588 3589 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3590 } 3591 3592 if (Target->isFunctionOrFunctionTemplate()) { 3593 FunctionDecl *FD; 3594 if (isa<FunctionTemplateDecl>(Target)) 3595 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3596 else 3597 FD = cast<FunctionDecl>(Target); 3598 3599 NamedDecl *OldDecl = 0; 3600 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3601 case Ovl_Overload: 3602 return false; 3603 3604 case Ovl_NonFunction: 3605 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3606 break; 3607 3608 // We found a decl with the exact signature. 3609 case Ovl_Match: 3610 // If we're in a record, we want to hide the target, so we 3611 // return true (without a diagnostic) to tell the caller not to 3612 // build a shadow decl. 3613 if (CurContext->isRecord()) 3614 return true; 3615 3616 // If we're not in a record, this is an error. 3617 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3618 break; 3619 } 3620 3621 Diag(Target->getLocation(), diag::note_using_decl_target); 3622 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3623 return true; 3624 } 3625 3626 // Target is not a function. 3627 3628 if (isa<TagDecl>(Target)) { 3629 // No conflict between a tag and a non-tag. 3630 if (!Tag) return false; 3631 3632 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3633 Diag(Target->getLocation(), diag::note_using_decl_target); 3634 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3635 return true; 3636 } 3637 3638 // No conflict between a tag and a non-tag. 3639 if (!NonTag) return false; 3640 3641 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3642 Diag(Target->getLocation(), diag::note_using_decl_target); 3643 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3644 return true; 3645} 3646 3647/// Builds a shadow declaration corresponding to a 'using' declaration. 3648UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3649 UsingDecl *UD, 3650 NamedDecl *Orig) { 3651 3652 // If we resolved to another shadow declaration, just coalesce them. 3653 NamedDecl *Target = Orig; 3654 if (isa<UsingShadowDecl>(Target)) { 3655 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3656 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3657 } 3658 3659 UsingShadowDecl *Shadow 3660 = UsingShadowDecl::Create(Context, CurContext, 3661 UD->getLocation(), UD, Target); 3662 UD->addShadowDecl(Shadow); 3663 3664 if (S) 3665 PushOnScopeChains(Shadow, S); 3666 else 3667 CurContext->addDecl(Shadow); 3668 Shadow->setAccess(UD->getAccess()); 3669 3670 // Register it as a conversion if appropriate. 3671 if (Shadow->getDeclName().getNameKind() 3672 == DeclarationName::CXXConversionFunctionName) 3673 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3674 3675 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3676 Shadow->setInvalidDecl(); 3677 3678 return Shadow; 3679} 3680 3681/// Hides a using shadow declaration. This is required by the current 3682/// using-decl implementation when a resolvable using declaration in a 3683/// class is followed by a declaration which would hide or override 3684/// one or more of the using decl's targets; for example: 3685/// 3686/// struct Base { void foo(int); }; 3687/// struct Derived : Base { 3688/// using Base::foo; 3689/// void foo(int); 3690/// }; 3691/// 3692/// The governing language is C++03 [namespace.udecl]p12: 3693/// 3694/// When a using-declaration brings names from a base class into a 3695/// derived class scope, member functions in the derived class 3696/// override and/or hide member functions with the same name and 3697/// parameter types in a base class (rather than conflicting). 3698/// 3699/// There are two ways to implement this: 3700/// (1) optimistically create shadow decls when they're not hidden 3701/// by existing declarations, or 3702/// (2) don't create any shadow decls (or at least don't make them 3703/// visible) until we've fully parsed/instantiated the class. 3704/// The problem with (1) is that we might have to retroactively remove 3705/// a shadow decl, which requires several O(n) operations because the 3706/// decl structures are (very reasonably) not designed for removal. 3707/// (2) avoids this but is very fiddly and phase-dependent. 3708void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3709 if (Shadow->getDeclName().getNameKind() == 3710 DeclarationName::CXXConversionFunctionName) 3711 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3712 3713 // Remove it from the DeclContext... 3714 Shadow->getDeclContext()->removeDecl(Shadow); 3715 3716 // ...and the scope, if applicable... 3717 if (S) { 3718 S->RemoveDecl(DeclPtrTy::make(static_cast<Decl*>(Shadow))); 3719 IdResolver.RemoveDecl(Shadow); 3720 } 3721 3722 // ...and the using decl. 3723 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3724 3725 // TODO: complain somehow if Shadow was used. It shouldn't 3726 // be possible for this to happen, because...? 3727} 3728 3729/// Builds a using declaration. 3730/// 3731/// \param IsInstantiation - Whether this call arises from an 3732/// instantiation of an unresolved using declaration. We treat 3733/// the lookup differently for these declarations. 3734NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3735 SourceLocation UsingLoc, 3736 CXXScopeSpec &SS, 3737 SourceLocation IdentLoc, 3738 DeclarationName Name, 3739 AttributeList *AttrList, 3740 bool IsInstantiation, 3741 bool IsTypeName, 3742 SourceLocation TypenameLoc) { 3743 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3744 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3745 3746 // FIXME: We ignore attributes for now. 3747 delete AttrList; 3748 3749 if (SS.isEmpty()) { 3750 Diag(IdentLoc, diag::err_using_requires_qualname); 3751 return 0; 3752 } 3753 3754 // Do the redeclaration lookup in the current scope. 3755 LookupResult Previous(*this, Name, IdentLoc, LookupUsingDeclName, 3756 ForRedeclaration); 3757 Previous.setHideTags(false); 3758 if (S) { 3759 LookupName(Previous, S); 3760 3761 // It is really dumb that we have to do this. 3762 LookupResult::Filter F = Previous.makeFilter(); 3763 while (F.hasNext()) { 3764 NamedDecl *D = F.next(); 3765 if (!isDeclInScope(D, CurContext, S)) 3766 F.erase(); 3767 } 3768 F.done(); 3769 } else { 3770 assert(IsInstantiation && "no scope in non-instantiation"); 3771 assert(CurContext->isRecord() && "scope not record in instantiation"); 3772 LookupQualifiedName(Previous, CurContext); 3773 } 3774 3775 NestedNameSpecifier *NNS = 3776 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3777 3778 // Check for invalid redeclarations. 3779 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3780 return 0; 3781 3782 // Check for bad qualifiers. 3783 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3784 return 0; 3785 3786 DeclContext *LookupContext = computeDeclContext(SS); 3787 NamedDecl *D; 3788 if (!LookupContext) { 3789 if (IsTypeName) { 3790 // FIXME: not all declaration name kinds are legal here 3791 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3792 UsingLoc, TypenameLoc, 3793 SS.getRange(), NNS, 3794 IdentLoc, Name); 3795 } else { 3796 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3797 UsingLoc, SS.getRange(), NNS, 3798 IdentLoc, Name); 3799 } 3800 } else { 3801 D = UsingDecl::Create(Context, CurContext, IdentLoc, 3802 SS.getRange(), UsingLoc, NNS, Name, 3803 IsTypeName); 3804 } 3805 D->setAccess(AS); 3806 CurContext->addDecl(D); 3807 3808 if (!LookupContext) return D; 3809 UsingDecl *UD = cast<UsingDecl>(D); 3810 3811 if (RequireCompleteDeclContext(SS, LookupContext)) { 3812 UD->setInvalidDecl(); 3813 return UD; 3814 } 3815 3816 // Look up the target name. 3817 3818 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 3819 3820 // Unlike most lookups, we don't always want to hide tag 3821 // declarations: tag names are visible through the using declaration 3822 // even if hidden by ordinary names, *except* in a dependent context 3823 // where it's important for the sanity of two-phase lookup. 3824 if (!IsInstantiation) 3825 R.setHideTags(false); 3826 3827 LookupQualifiedName(R, LookupContext); 3828 3829 if (R.empty()) { 3830 Diag(IdentLoc, diag::err_no_member) 3831 << Name << LookupContext << SS.getRange(); 3832 UD->setInvalidDecl(); 3833 return UD; 3834 } 3835 3836 if (R.isAmbiguous()) { 3837 UD->setInvalidDecl(); 3838 return UD; 3839 } 3840 3841 if (IsTypeName) { 3842 // If we asked for a typename and got a non-type decl, error out. 3843 if (!R.getAsSingle<TypeDecl>()) { 3844 Diag(IdentLoc, diag::err_using_typename_non_type); 3845 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3846 Diag((*I)->getUnderlyingDecl()->getLocation(), 3847 diag::note_using_decl_target); 3848 UD->setInvalidDecl(); 3849 return UD; 3850 } 3851 } else { 3852 // If we asked for a non-typename and we got a type, error out, 3853 // but only if this is an instantiation of an unresolved using 3854 // decl. Otherwise just silently find the type name. 3855 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3856 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3857 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3858 UD->setInvalidDecl(); 3859 return UD; 3860 } 3861 } 3862 3863 // C++0x N2914 [namespace.udecl]p6: 3864 // A using-declaration shall not name a namespace. 3865 if (R.getAsSingle<NamespaceDecl>()) { 3866 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3867 << SS.getRange(); 3868 UD->setInvalidDecl(); 3869 return UD; 3870 } 3871 3872 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 3873 if (!CheckUsingShadowDecl(UD, *I, Previous)) 3874 BuildUsingShadowDecl(S, UD, *I); 3875 } 3876 3877 return UD; 3878} 3879 3880/// Checks that the given using declaration is not an invalid 3881/// redeclaration. Note that this is checking only for the using decl 3882/// itself, not for any ill-formedness among the UsingShadowDecls. 3883bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 3884 bool isTypeName, 3885 const CXXScopeSpec &SS, 3886 SourceLocation NameLoc, 3887 const LookupResult &Prev) { 3888 // C++03 [namespace.udecl]p8: 3889 // C++0x [namespace.udecl]p10: 3890 // A using-declaration is a declaration and can therefore be used 3891 // repeatedly where (and only where) multiple declarations are 3892 // allowed. 3893 // 3894 // That's in non-member contexts. 3895 if (!CurContext->getLookupContext()->isRecord()) 3896 return false; 3897 3898 NestedNameSpecifier *Qual 3899 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3900 3901 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 3902 NamedDecl *D = *I; 3903 3904 bool DTypename; 3905 NestedNameSpecifier *DQual; 3906 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 3907 DTypename = UD->isTypeName(); 3908 DQual = UD->getTargetNestedNameDecl(); 3909 } else if (UnresolvedUsingValueDecl *UD 3910 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3911 DTypename = false; 3912 DQual = UD->getTargetNestedNameSpecifier(); 3913 } else if (UnresolvedUsingTypenameDecl *UD 3914 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3915 DTypename = true; 3916 DQual = UD->getTargetNestedNameSpecifier(); 3917 } else continue; 3918 3919 // using decls differ if one says 'typename' and the other doesn't. 3920 // FIXME: non-dependent using decls? 3921 if (isTypeName != DTypename) continue; 3922 3923 // using decls differ if they name different scopes (but note that 3924 // template instantiation can cause this check to trigger when it 3925 // didn't before instantiation). 3926 if (Context.getCanonicalNestedNameSpecifier(Qual) != 3927 Context.getCanonicalNestedNameSpecifier(DQual)) 3928 continue; 3929 3930 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 3931 Diag(D->getLocation(), diag::note_using_decl) << 1; 3932 return true; 3933 } 3934 3935 return false; 3936} 3937 3938 3939/// Checks that the given nested-name qualifier used in a using decl 3940/// in the current context is appropriately related to the current 3941/// scope. If an error is found, diagnoses it and returns true. 3942bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 3943 const CXXScopeSpec &SS, 3944 SourceLocation NameLoc) { 3945 DeclContext *NamedContext = computeDeclContext(SS); 3946 3947 if (!CurContext->isRecord()) { 3948 // C++03 [namespace.udecl]p3: 3949 // C++0x [namespace.udecl]p8: 3950 // A using-declaration for a class member shall be a member-declaration. 3951 3952 // If we weren't able to compute a valid scope, it must be a 3953 // dependent class scope. 3954 if (!NamedContext || NamedContext->isRecord()) { 3955 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 3956 << SS.getRange(); 3957 return true; 3958 } 3959 3960 // Otherwise, everything is known to be fine. 3961 return false; 3962 } 3963 3964 // The current scope is a record. 3965 3966 // If the named context is dependent, we can't decide much. 3967 if (!NamedContext) { 3968 // FIXME: in C++0x, we can diagnose if we can prove that the 3969 // nested-name-specifier does not refer to a base class, which is 3970 // still possible in some cases. 3971 3972 // Otherwise we have to conservatively report that things might be 3973 // okay. 3974 return false; 3975 } 3976 3977 if (!NamedContext->isRecord()) { 3978 // Ideally this would point at the last name in the specifier, 3979 // but we don't have that level of source info. 3980 Diag(SS.getRange().getBegin(), 3981 diag::err_using_decl_nested_name_specifier_is_not_class) 3982 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 3983 return true; 3984 } 3985 3986 if (getLangOptions().CPlusPlus0x) { 3987 // C++0x [namespace.udecl]p3: 3988 // In a using-declaration used as a member-declaration, the 3989 // nested-name-specifier shall name a base class of the class 3990 // being defined. 3991 3992 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 3993 cast<CXXRecordDecl>(NamedContext))) { 3994 if (CurContext == NamedContext) { 3995 Diag(NameLoc, 3996 diag::err_using_decl_nested_name_specifier_is_current_class) 3997 << SS.getRange(); 3998 return true; 3999 } 4000 4001 Diag(SS.getRange().getBegin(), 4002 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4003 << (NestedNameSpecifier*) SS.getScopeRep() 4004 << cast<CXXRecordDecl>(CurContext) 4005 << SS.getRange(); 4006 return true; 4007 } 4008 4009 return false; 4010 } 4011 4012 // C++03 [namespace.udecl]p4: 4013 // A using-declaration used as a member-declaration shall refer 4014 // to a member of a base class of the class being defined [etc.]. 4015 4016 // Salient point: SS doesn't have to name a base class as long as 4017 // lookup only finds members from base classes. Therefore we can 4018 // diagnose here only if we can prove that that can't happen, 4019 // i.e. if the class hierarchies provably don't intersect. 4020 4021 // TODO: it would be nice if "definitely valid" results were cached 4022 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4023 // need to be repeated. 4024 4025 struct UserData { 4026 llvm::DenseSet<const CXXRecordDecl*> Bases; 4027 4028 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4029 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4030 Data->Bases.insert(Base); 4031 return true; 4032 } 4033 4034 bool hasDependentBases(const CXXRecordDecl *Class) { 4035 return !Class->forallBases(collect, this); 4036 } 4037 4038 /// Returns true if the base is dependent or is one of the 4039 /// accumulated base classes. 4040 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4041 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4042 return !Data->Bases.count(Base); 4043 } 4044 4045 bool mightShareBases(const CXXRecordDecl *Class) { 4046 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4047 } 4048 }; 4049 4050 UserData Data; 4051 4052 // Returns false if we find a dependent base. 4053 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4054 return false; 4055 4056 // Returns false if the class has a dependent base or if it or one 4057 // of its bases is present in the base set of the current context. 4058 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4059 return false; 4060 4061 Diag(SS.getRange().getBegin(), 4062 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4063 << (NestedNameSpecifier*) SS.getScopeRep() 4064 << cast<CXXRecordDecl>(CurContext) 4065 << SS.getRange(); 4066 4067 return true; 4068} 4069 4070Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 4071 SourceLocation NamespaceLoc, 4072 SourceLocation AliasLoc, 4073 IdentifierInfo *Alias, 4074 CXXScopeSpec &SS, 4075 SourceLocation IdentLoc, 4076 IdentifierInfo *Ident) { 4077 4078 // Lookup the namespace name. 4079 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4080 LookupParsedName(R, S, &SS); 4081 4082 // Check if we have a previous declaration with the same name. 4083 NamedDecl *PrevDecl 4084 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4085 ForRedeclaration); 4086 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4087 PrevDecl = 0; 4088 4089 if (PrevDecl) { 4090 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4091 // We already have an alias with the same name that points to the same 4092 // namespace, so don't create a new one. 4093 // FIXME: At some point, we'll want to create the (redundant) 4094 // declaration to maintain better source information. 4095 if (!R.isAmbiguous() && !R.empty() && 4096 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4097 return DeclPtrTy(); 4098 } 4099 4100 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4101 diag::err_redefinition_different_kind; 4102 Diag(AliasLoc, DiagID) << Alias; 4103 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4104 return DeclPtrTy(); 4105 } 4106 4107 if (R.isAmbiguous()) 4108 return DeclPtrTy(); 4109 4110 if (R.empty()) { 4111 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4112 CTC_NoKeywords, 0)) { 4113 if (R.getAsSingle<NamespaceDecl>() || 4114 R.getAsSingle<NamespaceAliasDecl>()) { 4115 if (DeclContext *DC = computeDeclContext(SS, false)) 4116 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4117 << Ident << DC << Corrected << SS.getRange() 4118 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4119 else 4120 Diag(IdentLoc, diag::err_using_directive_suggest) 4121 << Ident << Corrected 4122 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4123 4124 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4125 << Corrected; 4126 4127 Ident = Corrected.getAsIdentifierInfo(); 4128 } else { 4129 R.clear(); 4130 R.setLookupName(Ident); 4131 } 4132 } 4133 4134 if (R.empty()) { 4135 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4136 return DeclPtrTy(); 4137 } 4138 } 4139 4140 NamespaceAliasDecl *AliasDecl = 4141 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4142 Alias, SS.getRange(), 4143 (NestedNameSpecifier *)SS.getScopeRep(), 4144 IdentLoc, R.getFoundDecl()); 4145 4146 PushOnScopeChains(AliasDecl, S); 4147 return DeclPtrTy::make(AliasDecl); 4148} 4149 4150namespace { 4151 /// \brief Scoped object used to handle the state changes required in Sema 4152 /// to implicitly define the body of a C++ member function; 4153 class ImplicitlyDefinedFunctionScope { 4154 Sema &S; 4155 DeclContext *PreviousContext; 4156 4157 public: 4158 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4159 : S(S), PreviousContext(S.CurContext) 4160 { 4161 S.CurContext = Method; 4162 S.PushFunctionScope(); 4163 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4164 } 4165 4166 ~ImplicitlyDefinedFunctionScope() { 4167 S.PopExpressionEvaluationContext(); 4168 S.PopFunctionOrBlockScope(); 4169 S.CurContext = PreviousContext; 4170 } 4171 }; 4172} 4173 4174CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4175 CXXRecordDecl *ClassDecl) { 4176 // C++ [class.ctor]p5: 4177 // A default constructor for a class X is a constructor of class X 4178 // that can be called without an argument. If there is no 4179 // user-declared constructor for class X, a default constructor is 4180 // implicitly declared. An implicitly-declared default constructor 4181 // is an inline public member of its class. 4182 assert(!ClassDecl->hasUserDeclaredConstructor() && 4183 "Should not build implicit default constructor!"); 4184 4185 // C++ [except.spec]p14: 4186 // An implicitly declared special member function (Clause 12) shall have an 4187 // exception-specification. [...] 4188 ImplicitExceptionSpecification ExceptSpec(Context); 4189 4190 // Direct base-class destructors. 4191 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4192 BEnd = ClassDecl->bases_end(); 4193 B != BEnd; ++B) { 4194 if (B->isVirtual()) // Handled below. 4195 continue; 4196 4197 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4198 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4199 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4200 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4201 else if (CXXConstructorDecl *Constructor 4202 = BaseClassDecl->getDefaultConstructor()) 4203 ExceptSpec.CalledDecl(Constructor); 4204 } 4205 } 4206 4207 // Virtual base-class destructors. 4208 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4209 BEnd = ClassDecl->vbases_end(); 4210 B != BEnd; ++B) { 4211 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4212 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4213 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4214 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4215 else if (CXXConstructorDecl *Constructor 4216 = BaseClassDecl->getDefaultConstructor()) 4217 ExceptSpec.CalledDecl(Constructor); 4218 } 4219 } 4220 4221 // Field destructors. 4222 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4223 FEnd = ClassDecl->field_end(); 4224 F != FEnd; ++F) { 4225 if (const RecordType *RecordTy 4226 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4227 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4228 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4229 ExceptSpec.CalledDecl( 4230 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4231 else if (CXXConstructorDecl *Constructor 4232 = FieldClassDecl->getDefaultConstructor()) 4233 ExceptSpec.CalledDecl(Constructor); 4234 } 4235 } 4236 4237 4238 // Create the actual constructor declaration. 4239 CanQualType ClassType 4240 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4241 DeclarationName Name 4242 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4243 CXXConstructorDecl *DefaultCon 4244 = CXXConstructorDecl::Create(Context, ClassDecl, 4245 ClassDecl->getLocation(), Name, 4246 Context.getFunctionType(Context.VoidTy, 4247 0, 0, false, 0, 4248 ExceptSpec.hasExceptionSpecification(), 4249 ExceptSpec.hasAnyExceptionSpecification(), 4250 ExceptSpec.size(), 4251 ExceptSpec.data(), 4252 FunctionType::ExtInfo()), 4253 /*TInfo=*/0, 4254 /*isExplicit=*/false, 4255 /*isInline=*/true, 4256 /*isImplicitlyDeclared=*/true); 4257 DefaultCon->setAccess(AS_public); 4258 DefaultCon->setImplicit(); 4259 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4260 4261 // Note that we have declared this constructor. 4262 ClassDecl->setDeclaredDefaultConstructor(true); 4263 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4264 4265 if (Scope *S = getScopeForContext(ClassDecl)) 4266 PushOnScopeChains(DefaultCon, S, false); 4267 ClassDecl->addDecl(DefaultCon); 4268 4269 return DefaultCon; 4270} 4271 4272void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4273 CXXConstructorDecl *Constructor) { 4274 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4275 !Constructor->isUsed(false)) && 4276 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4277 4278 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4279 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4280 4281 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4282 ErrorTrap Trap(*this); 4283 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4284 Trap.hasErrorOccurred()) { 4285 Diag(CurrentLocation, diag::note_member_synthesized_at) 4286 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4287 Constructor->setInvalidDecl(); 4288 } else { 4289 Constructor->setUsed(); 4290 MarkVTableUsed(CurrentLocation, ClassDecl); 4291 } 4292} 4293 4294CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4295 // C++ [class.dtor]p2: 4296 // If a class has no user-declared destructor, a destructor is 4297 // declared implicitly. An implicitly-declared destructor is an 4298 // inline public member of its class. 4299 4300 // C++ [except.spec]p14: 4301 // An implicitly declared special member function (Clause 12) shall have 4302 // an exception-specification. 4303 ImplicitExceptionSpecification ExceptSpec(Context); 4304 4305 // Direct base-class destructors. 4306 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4307 BEnd = ClassDecl->bases_end(); 4308 B != BEnd; ++B) { 4309 if (B->isVirtual()) // Handled below. 4310 continue; 4311 4312 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4313 ExceptSpec.CalledDecl( 4314 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4315 } 4316 4317 // Virtual base-class destructors. 4318 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4319 BEnd = ClassDecl->vbases_end(); 4320 B != BEnd; ++B) { 4321 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4322 ExceptSpec.CalledDecl( 4323 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4324 } 4325 4326 // Field destructors. 4327 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4328 FEnd = ClassDecl->field_end(); 4329 F != FEnd; ++F) { 4330 if (const RecordType *RecordTy 4331 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4332 ExceptSpec.CalledDecl( 4333 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4334 } 4335 4336 // Create the actual destructor declaration. 4337 QualType Ty = Context.getFunctionType(Context.VoidTy, 4338 0, 0, false, 0, 4339 ExceptSpec.hasExceptionSpecification(), 4340 ExceptSpec.hasAnyExceptionSpecification(), 4341 ExceptSpec.size(), 4342 ExceptSpec.data(), 4343 FunctionType::ExtInfo()); 4344 4345 CanQualType ClassType 4346 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4347 DeclarationName Name 4348 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4349 CXXDestructorDecl *Destructor 4350 = CXXDestructorDecl::Create(Context, ClassDecl, 4351 ClassDecl->getLocation(), Name, Ty, 4352 /*isInline=*/true, 4353 /*isImplicitlyDeclared=*/true); 4354 Destructor->setAccess(AS_public); 4355 Destructor->setImplicit(); 4356 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4357 4358 // Note that we have declared this destructor. 4359 ClassDecl->setDeclaredDestructor(true); 4360 ++ASTContext::NumImplicitDestructorsDeclared; 4361 4362 // Introduce this destructor into its scope. 4363 if (Scope *S = getScopeForContext(ClassDecl)) 4364 PushOnScopeChains(Destructor, S, false); 4365 ClassDecl->addDecl(Destructor); 4366 4367 // This could be uniqued if it ever proves significant. 4368 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4369 4370 AddOverriddenMethods(ClassDecl, Destructor); 4371 4372 return Destructor; 4373} 4374 4375void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4376 CXXDestructorDecl *Destructor) { 4377 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4378 "DefineImplicitDestructor - call it for implicit default dtor"); 4379 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4380 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4381 4382 if (Destructor->isInvalidDecl()) 4383 return; 4384 4385 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4386 4387 ErrorTrap Trap(*this); 4388 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4389 Destructor->getParent()); 4390 4391 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4392 Diag(CurrentLocation, diag::note_member_synthesized_at) 4393 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4394 4395 Destructor->setInvalidDecl(); 4396 return; 4397 } 4398 4399 Destructor->setUsed(); 4400 MarkVTableUsed(CurrentLocation, ClassDecl); 4401} 4402 4403/// \brief Builds a statement that copies the given entity from \p From to 4404/// \c To. 4405/// 4406/// This routine is used to copy the members of a class with an 4407/// implicitly-declared copy assignment operator. When the entities being 4408/// copied are arrays, this routine builds for loops to copy them. 4409/// 4410/// \param S The Sema object used for type-checking. 4411/// 4412/// \param Loc The location where the implicit copy is being generated. 4413/// 4414/// \param T The type of the expressions being copied. Both expressions must 4415/// have this type. 4416/// 4417/// \param To The expression we are copying to. 4418/// 4419/// \param From The expression we are copying from. 4420/// 4421/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4422/// Otherwise, it's a non-static member subobject. 4423/// 4424/// \param Depth Internal parameter recording the depth of the recursion. 4425/// 4426/// \returns A statement or a loop that copies the expressions. 4427static Sema::OwningStmtResult 4428BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4429 Sema::OwningExprResult To, Sema::OwningExprResult From, 4430 bool CopyingBaseSubobject, unsigned Depth = 0) { 4431 typedef Sema::OwningStmtResult OwningStmtResult; 4432 typedef Sema::OwningExprResult OwningExprResult; 4433 4434 // C++0x [class.copy]p30: 4435 // Each subobject is assigned in the manner appropriate to its type: 4436 // 4437 // - if the subobject is of class type, the copy assignment operator 4438 // for the class is used (as if by explicit qualification; that is, 4439 // ignoring any possible virtual overriding functions in more derived 4440 // classes); 4441 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4442 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4443 4444 // Look for operator=. 4445 DeclarationName Name 4446 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4447 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4448 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4449 4450 // Filter out any result that isn't a copy-assignment operator. 4451 LookupResult::Filter F = OpLookup.makeFilter(); 4452 while (F.hasNext()) { 4453 NamedDecl *D = F.next(); 4454 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4455 if (Method->isCopyAssignmentOperator()) 4456 continue; 4457 4458 F.erase(); 4459 } 4460 F.done(); 4461 4462 // Suppress the protected check (C++ [class.protected]) for each of the 4463 // assignment operators we found. This strange dance is required when 4464 // we're assigning via a base classes's copy-assignment operator. To 4465 // ensure that we're getting the right base class subobject (without 4466 // ambiguities), we need to cast "this" to that subobject type; to 4467 // ensure that we don't go through the virtual call mechanism, we need 4468 // to qualify the operator= name with the base class (see below). However, 4469 // this means that if the base class has a protected copy assignment 4470 // operator, the protected member access check will fail. So, we 4471 // rewrite "protected" access to "public" access in this case, since we 4472 // know by construction that we're calling from a derived class. 4473 if (CopyingBaseSubobject) { 4474 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4475 L != LEnd; ++L) { 4476 if (L.getAccess() == AS_protected) 4477 L.setAccess(AS_public); 4478 } 4479 } 4480 4481 // Create the nested-name-specifier that will be used to qualify the 4482 // reference to operator=; this is required to suppress the virtual 4483 // call mechanism. 4484 CXXScopeSpec SS; 4485 SS.setRange(Loc); 4486 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4487 T.getTypePtr())); 4488 4489 // Create the reference to operator=. 4490 OwningExprResult OpEqualRef 4491 = S.BuildMemberReferenceExpr(move(To), T, Loc, /*isArrow=*/false, SS, 4492 /*FirstQualifierInScope=*/0, OpLookup, 4493 /*TemplateArgs=*/0, 4494 /*SuppressQualifierCheck=*/true); 4495 if (OpEqualRef.isInvalid()) 4496 return S.StmtError(); 4497 4498 // Build the call to the assignment operator. 4499 Expr *FromE = From.takeAs<Expr>(); 4500 OwningExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4501 OpEqualRef.takeAs<Expr>(), 4502 Loc, &FromE, 1, 0, Loc); 4503 if (Call.isInvalid()) 4504 return S.StmtError(); 4505 4506 return S.Owned(Call.takeAs<Stmt>()); 4507 } 4508 4509 // - if the subobject is of scalar type, the built-in assignment 4510 // operator is used. 4511 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4512 if (!ArrayTy) { 4513 OwningExprResult Assignment = S.CreateBuiltinBinOp(Loc, 4514 BinaryOperator::Assign, 4515 To.takeAs<Expr>(), 4516 From.takeAs<Expr>()); 4517 if (Assignment.isInvalid()) 4518 return S.StmtError(); 4519 4520 return S.Owned(Assignment.takeAs<Stmt>()); 4521 } 4522 4523 // - if the subobject is an array, each element is assigned, in the 4524 // manner appropriate to the element type; 4525 4526 // Construct a loop over the array bounds, e.g., 4527 // 4528 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4529 // 4530 // that will copy each of the array elements. 4531 QualType SizeType = S.Context.getSizeType(); 4532 4533 // Create the iteration variable. 4534 IdentifierInfo *IterationVarName = 0; 4535 { 4536 llvm::SmallString<8> Str; 4537 llvm::raw_svector_ostream OS(Str); 4538 OS << "__i" << Depth; 4539 IterationVarName = &S.Context.Idents.get(OS.str()); 4540 } 4541 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4542 IterationVarName, SizeType, 4543 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4544 VarDecl::None, VarDecl::None); 4545 4546 // Initialize the iteration variable to zero. 4547 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4548 IterationVar->setInit(new (S.Context) IntegerLiteral(Zero, SizeType, Loc)); 4549 4550 // Create a reference to the iteration variable; we'll use this several 4551 // times throughout. 4552 Expr *IterationVarRef 4553 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4554 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4555 4556 // Create the DeclStmt that holds the iteration variable. 4557 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4558 4559 // Create the comparison against the array bound. 4560 llvm::APInt Upper = ArrayTy->getSize(); 4561 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4562 OwningExprResult Comparison 4563 = S.Owned(new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4564 new (S.Context) IntegerLiteral(Upper, SizeType, Loc), 4565 BinaryOperator::NE, S.Context.BoolTy, Loc)); 4566 4567 // Create the pre-increment of the iteration variable. 4568 OwningExprResult Increment 4569 = S.Owned(new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4570 UnaryOperator::PreInc, 4571 SizeType, Loc)); 4572 4573 // Subscript the "from" and "to" expressions with the iteration variable. 4574 From = S.CreateBuiltinArraySubscriptExpr(move(From), Loc, 4575 S.Owned(IterationVarRef->Retain()), 4576 Loc); 4577 To = S.CreateBuiltinArraySubscriptExpr(move(To), Loc, 4578 S.Owned(IterationVarRef->Retain()), 4579 Loc); 4580 assert(!From.isInvalid() && "Builtin subscripting can't fail!"); 4581 assert(!To.isInvalid() && "Builtin subscripting can't fail!"); 4582 4583 // Build the copy for an individual element of the array. 4584 OwningStmtResult Copy = BuildSingleCopyAssign(S, Loc, 4585 ArrayTy->getElementType(), 4586 move(To), move(From), 4587 CopyingBaseSubobject, Depth+1); 4588 if (Copy.isInvalid()) 4589 return S.StmtError(); 4590 4591 // Construct the loop that copies all elements of this array. 4592 return S.ActOnForStmt(Loc, Loc, S.Owned(InitStmt), 4593 S.MakeFullExpr(Comparison), 4594 Sema::DeclPtrTy(), 4595 S.MakeFullExpr(Increment), 4596 Loc, move(Copy)); 4597} 4598 4599/// \brief Determine whether the given class has a copy assignment operator 4600/// that accepts a const-qualified argument. 4601static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4602 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4603 4604 if (!Class->hasDeclaredCopyAssignment()) 4605 S.DeclareImplicitCopyAssignment(Class); 4606 4607 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4608 DeclarationName OpName 4609 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4610 4611 DeclContext::lookup_const_iterator Op, OpEnd; 4612 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4613 // C++ [class.copy]p9: 4614 // A user-declared copy assignment operator is a non-static non-template 4615 // member function of class X with exactly one parameter of type X, X&, 4616 // const X&, volatile X& or const volatile X&. 4617 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4618 if (!Method) 4619 continue; 4620 4621 if (Method->isStatic()) 4622 continue; 4623 if (Method->getPrimaryTemplate()) 4624 continue; 4625 const FunctionProtoType *FnType = 4626 Method->getType()->getAs<FunctionProtoType>(); 4627 assert(FnType && "Overloaded operator has no prototype."); 4628 // Don't assert on this; an invalid decl might have been left in the AST. 4629 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4630 continue; 4631 bool AcceptsConst = true; 4632 QualType ArgType = FnType->getArgType(0); 4633 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4634 ArgType = Ref->getPointeeType(); 4635 // Is it a non-const lvalue reference? 4636 if (!ArgType.isConstQualified()) 4637 AcceptsConst = false; 4638 } 4639 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4640 continue; 4641 4642 // We have a single argument of type cv X or cv X&, i.e. we've found the 4643 // copy assignment operator. Return whether it accepts const arguments. 4644 return AcceptsConst; 4645 } 4646 assert(Class->isInvalidDecl() && 4647 "No copy assignment operator declared in valid code."); 4648 return false; 4649} 4650 4651CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4652 // Note: The following rules are largely analoguous to the copy 4653 // constructor rules. Note that virtual bases are not taken into account 4654 // for determining the argument type of the operator. Note also that 4655 // operators taking an object instead of a reference are allowed. 4656 4657 4658 // C++ [class.copy]p10: 4659 // If the class definition does not explicitly declare a copy 4660 // assignment operator, one is declared implicitly. 4661 // The implicitly-defined copy assignment operator for a class X 4662 // will have the form 4663 // 4664 // X& X::operator=(const X&) 4665 // 4666 // if 4667 bool HasConstCopyAssignment = true; 4668 4669 // -- each direct base class B of X has a copy assignment operator 4670 // whose parameter is of type const B&, const volatile B& or B, 4671 // and 4672 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4673 BaseEnd = ClassDecl->bases_end(); 4674 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4675 assert(!Base->getType()->isDependentType() && 4676 "Cannot generate implicit members for class with dependent bases."); 4677 const CXXRecordDecl *BaseClassDecl 4678 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4679 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4680 } 4681 4682 // -- for all the nonstatic data members of X that are of a class 4683 // type M (or array thereof), each such class type has a copy 4684 // assignment operator whose parameter is of type const M&, 4685 // const volatile M& or M. 4686 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4687 FieldEnd = ClassDecl->field_end(); 4688 HasConstCopyAssignment && Field != FieldEnd; 4689 ++Field) { 4690 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4691 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4692 const CXXRecordDecl *FieldClassDecl 4693 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4694 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4695 } 4696 } 4697 4698 // Otherwise, the implicitly declared copy assignment operator will 4699 // have the form 4700 // 4701 // X& X::operator=(X&) 4702 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4703 QualType RetType = Context.getLValueReferenceType(ArgType); 4704 if (HasConstCopyAssignment) 4705 ArgType = ArgType.withConst(); 4706 ArgType = Context.getLValueReferenceType(ArgType); 4707 4708 // C++ [except.spec]p14: 4709 // An implicitly declared special member function (Clause 12) shall have an 4710 // exception-specification. [...] 4711 ImplicitExceptionSpecification ExceptSpec(Context); 4712 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4713 BaseEnd = ClassDecl->bases_end(); 4714 Base != BaseEnd; ++Base) { 4715 CXXRecordDecl *BaseClassDecl 4716 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4717 4718 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4719 DeclareImplicitCopyAssignment(BaseClassDecl); 4720 4721 if (CXXMethodDecl *CopyAssign 4722 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4723 ExceptSpec.CalledDecl(CopyAssign); 4724 } 4725 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4726 FieldEnd = ClassDecl->field_end(); 4727 Field != FieldEnd; 4728 ++Field) { 4729 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4730 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4731 CXXRecordDecl *FieldClassDecl 4732 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4733 4734 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 4735 DeclareImplicitCopyAssignment(FieldClassDecl); 4736 4737 if (CXXMethodDecl *CopyAssign 4738 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4739 ExceptSpec.CalledDecl(CopyAssign); 4740 } 4741 } 4742 4743 // An implicitly-declared copy assignment operator is an inline public 4744 // member of its class. 4745 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4746 CXXMethodDecl *CopyAssignment 4747 = CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 4748 Context.getFunctionType(RetType, &ArgType, 1, 4749 false, 0, 4750 ExceptSpec.hasExceptionSpecification(), 4751 ExceptSpec.hasAnyExceptionSpecification(), 4752 ExceptSpec.size(), 4753 ExceptSpec.data(), 4754 FunctionType::ExtInfo()), 4755 /*TInfo=*/0, /*isStatic=*/false, 4756 /*StorageClassAsWritten=*/FunctionDecl::None, 4757 /*isInline=*/true); 4758 CopyAssignment->setAccess(AS_public); 4759 CopyAssignment->setImplicit(); 4760 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4761 CopyAssignment->setCopyAssignment(true); 4762 4763 // Add the parameter to the operator. 4764 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4765 ClassDecl->getLocation(), 4766 /*Id=*/0, 4767 ArgType, /*TInfo=*/0, 4768 VarDecl::None, 4769 VarDecl::None, 0); 4770 CopyAssignment->setParams(&FromParam, 1); 4771 4772 // Note that we have added this copy-assignment operator. 4773 ClassDecl->setDeclaredCopyAssignment(true); 4774 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 4775 4776 if (Scope *S = getScopeForContext(ClassDecl)) 4777 PushOnScopeChains(CopyAssignment, S, false); 4778 ClassDecl->addDecl(CopyAssignment); 4779 4780 AddOverriddenMethods(ClassDecl, CopyAssignment); 4781 return CopyAssignment; 4782} 4783 4784void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4785 CXXMethodDecl *CopyAssignOperator) { 4786 assert((CopyAssignOperator->isImplicit() && 4787 CopyAssignOperator->isOverloadedOperator() && 4788 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4789 !CopyAssignOperator->isUsed(false)) && 4790 "DefineImplicitCopyAssignment called for wrong function"); 4791 4792 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4793 4794 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4795 CopyAssignOperator->setInvalidDecl(); 4796 return; 4797 } 4798 4799 CopyAssignOperator->setUsed(); 4800 4801 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4802 ErrorTrap Trap(*this); 4803 4804 // C++0x [class.copy]p30: 4805 // The implicitly-defined or explicitly-defaulted copy assignment operator 4806 // for a non-union class X performs memberwise copy assignment of its 4807 // subobjects. The direct base classes of X are assigned first, in the 4808 // order of their declaration in the base-specifier-list, and then the 4809 // immediate non-static data members of X are assigned, in the order in 4810 // which they were declared in the class definition. 4811 4812 // The statements that form the synthesized function body. 4813 ASTOwningVector<&ActionBase::DeleteStmt> Statements(*this); 4814 4815 // The parameter for the "other" object, which we are copying from. 4816 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4817 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4818 QualType OtherRefType = Other->getType(); 4819 if (const LValueReferenceType *OtherRef 4820 = OtherRefType->getAs<LValueReferenceType>()) { 4821 OtherRefType = OtherRef->getPointeeType(); 4822 OtherQuals = OtherRefType.getQualifiers(); 4823 } 4824 4825 // Our location for everything implicitly-generated. 4826 SourceLocation Loc = CopyAssignOperator->getLocation(); 4827 4828 // Construct a reference to the "other" object. We'll be using this 4829 // throughout the generated ASTs. 4830 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4831 assert(OtherRef && "Reference to parameter cannot fail!"); 4832 4833 // Construct the "this" pointer. We'll be using this throughout the generated 4834 // ASTs. 4835 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4836 assert(This && "Reference to this cannot fail!"); 4837 4838 // Assign base classes. 4839 bool Invalid = false; 4840 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4841 E = ClassDecl->bases_end(); Base != E; ++Base) { 4842 // Form the assignment: 4843 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4844 QualType BaseType = Base->getType().getUnqualifiedType(); 4845 CXXRecordDecl *BaseClassDecl = 0; 4846 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4847 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4848 else { 4849 Invalid = true; 4850 continue; 4851 } 4852 4853 // Construct the "from" expression, which is an implicit cast to the 4854 // appropriately-qualified base type. 4855 Expr *From = OtherRef->Retain(); 4856 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4857 CastExpr::CK_UncheckedDerivedToBase, 4858 ImplicitCastExpr::LValue, CXXBaseSpecifierArray(Base)); 4859 4860 // Dereference "this". 4861 OwningExprResult To = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 4862 Owned(This->Retain())); 4863 4864 // Implicitly cast "this" to the appropriately-qualified base type. 4865 Expr *ToE = To.takeAs<Expr>(); 4866 ImpCastExprToType(ToE, 4867 Context.getCVRQualifiedType(BaseType, 4868 CopyAssignOperator->getTypeQualifiers()), 4869 CastExpr::CK_UncheckedDerivedToBase, 4870 ImplicitCastExpr::LValue, CXXBaseSpecifierArray(Base)); 4871 To = Owned(ToE); 4872 4873 // Build the copy. 4874 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4875 move(To), Owned(From), 4876 /*CopyingBaseSubobject=*/true); 4877 if (Copy.isInvalid()) { 4878 Diag(CurrentLocation, diag::note_member_synthesized_at) 4879 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4880 CopyAssignOperator->setInvalidDecl(); 4881 return; 4882 } 4883 4884 // Success! Record the copy. 4885 Statements.push_back(Copy.takeAs<Expr>()); 4886 } 4887 4888 // \brief Reference to the __builtin_memcpy function. 4889 Expr *BuiltinMemCpyRef = 0; 4890 // \brief Reference to the __builtin_objc_memmove_collectable function. 4891 Expr *CollectableMemCpyRef = 0; 4892 4893 // Assign non-static members. 4894 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4895 FieldEnd = ClassDecl->field_end(); 4896 Field != FieldEnd; ++Field) { 4897 // Check for members of reference type; we can't copy those. 4898 if (Field->getType()->isReferenceType()) { 4899 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4900 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 4901 Diag(Field->getLocation(), diag::note_declared_at); 4902 Diag(CurrentLocation, diag::note_member_synthesized_at) 4903 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4904 Invalid = true; 4905 continue; 4906 } 4907 4908 // Check for members of const-qualified, non-class type. 4909 QualType BaseType = Context.getBaseElementType(Field->getType()); 4910 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 4911 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 4912 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 4913 Diag(Field->getLocation(), diag::note_declared_at); 4914 Diag(CurrentLocation, diag::note_member_synthesized_at) 4915 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 4916 Invalid = true; 4917 continue; 4918 } 4919 4920 QualType FieldType = Field->getType().getNonReferenceType(); 4921 if (FieldType->isIncompleteArrayType()) { 4922 assert(ClassDecl->hasFlexibleArrayMember() && 4923 "Incomplete array type is not valid"); 4924 continue; 4925 } 4926 4927 // Build references to the field in the object we're copying from and to. 4928 CXXScopeSpec SS; // Intentionally empty 4929 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 4930 LookupMemberName); 4931 MemberLookup.addDecl(*Field); 4932 MemberLookup.resolveKind(); 4933 OwningExprResult From = BuildMemberReferenceExpr(Owned(OtherRef->Retain()), 4934 OtherRefType, 4935 Loc, /*IsArrow=*/false, 4936 SS, 0, MemberLookup, 0); 4937 OwningExprResult To = BuildMemberReferenceExpr(Owned(This->Retain()), 4938 This->getType(), 4939 Loc, /*IsArrow=*/true, 4940 SS, 0, MemberLookup, 0); 4941 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 4942 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 4943 4944 // If the field should be copied with __builtin_memcpy rather than via 4945 // explicit assignments, do so. This optimization only applies for arrays 4946 // of scalars and arrays of class type with trivial copy-assignment 4947 // operators. 4948 if (FieldType->isArrayType() && 4949 (!BaseType->isRecordType() || 4950 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 4951 ->hasTrivialCopyAssignment())) { 4952 // Compute the size of the memory buffer to be copied. 4953 QualType SizeType = Context.getSizeType(); 4954 llvm::APInt Size(Context.getTypeSize(SizeType), 4955 Context.getTypeSizeInChars(BaseType).getQuantity()); 4956 for (const ConstantArrayType *Array 4957 = Context.getAsConstantArrayType(FieldType); 4958 Array; 4959 Array = Context.getAsConstantArrayType(Array->getElementType())) { 4960 llvm::APInt ArraySize = Array->getSize(); 4961 ArraySize.zextOrTrunc(Size.getBitWidth()); 4962 Size *= ArraySize; 4963 } 4964 4965 // Take the address of the field references for "from" and "to". 4966 From = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(From)); 4967 To = CreateBuiltinUnaryOp(Loc, UnaryOperator::AddrOf, move(To)); 4968 4969 bool NeedsCollectableMemCpy = 4970 (BaseType->isRecordType() && 4971 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 4972 4973 if (NeedsCollectableMemCpy) { 4974 if (!CollectableMemCpyRef) { 4975 // Create a reference to the __builtin_objc_memmove_collectable function. 4976 LookupResult R(*this, 4977 &Context.Idents.get("__builtin_objc_memmove_collectable"), 4978 Loc, LookupOrdinaryName); 4979 LookupName(R, TUScope, true); 4980 4981 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 4982 if (!CollectableMemCpy) { 4983 // Something went horribly wrong earlier, and we will have 4984 // complained about it. 4985 Invalid = true; 4986 continue; 4987 } 4988 4989 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 4990 CollectableMemCpy->getType(), 4991 Loc, 0).takeAs<Expr>(); 4992 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 4993 } 4994 } 4995 // Create a reference to the __builtin_memcpy builtin function. 4996 else if (!BuiltinMemCpyRef) { 4997 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 4998 LookupOrdinaryName); 4999 LookupName(R, TUScope, true); 5000 5001 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5002 if (!BuiltinMemCpy) { 5003 // Something went horribly wrong earlier, and we will have complained 5004 // about it. 5005 Invalid = true; 5006 continue; 5007 } 5008 5009 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5010 BuiltinMemCpy->getType(), 5011 Loc, 0).takeAs<Expr>(); 5012 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5013 } 5014 5015 ASTOwningVector<&ActionBase::DeleteExpr> CallArgs(*this); 5016 CallArgs.push_back(To.takeAs<Expr>()); 5017 CallArgs.push_back(From.takeAs<Expr>()); 5018 CallArgs.push_back(new (Context) IntegerLiteral(Size, SizeType, Loc)); 5019 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 5020 Commas.push_back(Loc); 5021 Commas.push_back(Loc); 5022 OwningExprResult Call = ExprError(); 5023 if (NeedsCollectableMemCpy) 5024 Call = ActOnCallExpr(/*Scope=*/0, 5025 Owned(CollectableMemCpyRef->Retain()), 5026 Loc, move_arg(CallArgs), 5027 Commas.data(), Loc); 5028 else 5029 Call = ActOnCallExpr(/*Scope=*/0, 5030 Owned(BuiltinMemCpyRef->Retain()), 5031 Loc, move_arg(CallArgs), 5032 Commas.data(), Loc); 5033 5034 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5035 Statements.push_back(Call.takeAs<Expr>()); 5036 continue; 5037 } 5038 5039 // Build the copy of this field. 5040 OwningStmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5041 move(To), move(From), 5042 /*CopyingBaseSubobject=*/false); 5043 if (Copy.isInvalid()) { 5044 Diag(CurrentLocation, diag::note_member_synthesized_at) 5045 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5046 CopyAssignOperator->setInvalidDecl(); 5047 return; 5048 } 5049 5050 // Success! Record the copy. 5051 Statements.push_back(Copy.takeAs<Stmt>()); 5052 } 5053 5054 if (!Invalid) { 5055 // Add a "return *this;" 5056 OwningExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UnaryOperator::Deref, 5057 Owned(This->Retain())); 5058 5059 OwningStmtResult Return = ActOnReturnStmt(Loc, move(ThisObj)); 5060 if (Return.isInvalid()) 5061 Invalid = true; 5062 else { 5063 Statements.push_back(Return.takeAs<Stmt>()); 5064 5065 if (Trap.hasErrorOccurred()) { 5066 Diag(CurrentLocation, diag::note_member_synthesized_at) 5067 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5068 Invalid = true; 5069 } 5070 } 5071 } 5072 5073 if (Invalid) { 5074 CopyAssignOperator->setInvalidDecl(); 5075 return; 5076 } 5077 5078 OwningStmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5079 /*isStmtExpr=*/false); 5080 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5081 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5082} 5083 5084CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5085 CXXRecordDecl *ClassDecl) { 5086 // C++ [class.copy]p4: 5087 // If the class definition does not explicitly declare a copy 5088 // constructor, one is declared implicitly. 5089 5090 // C++ [class.copy]p5: 5091 // The implicitly-declared copy constructor for a class X will 5092 // have the form 5093 // 5094 // X::X(const X&) 5095 // 5096 // if 5097 bool HasConstCopyConstructor = true; 5098 5099 // -- each direct or virtual base class B of X has a copy 5100 // constructor whose first parameter is of type const B& or 5101 // const volatile B&, and 5102 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5103 BaseEnd = ClassDecl->bases_end(); 5104 HasConstCopyConstructor && Base != BaseEnd; 5105 ++Base) { 5106 // Virtual bases are handled below. 5107 if (Base->isVirtual()) 5108 continue; 5109 5110 CXXRecordDecl *BaseClassDecl 5111 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5112 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5113 DeclareImplicitCopyConstructor(BaseClassDecl); 5114 5115 HasConstCopyConstructor 5116 = BaseClassDecl->hasConstCopyConstructor(Context); 5117 } 5118 5119 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5120 BaseEnd = ClassDecl->vbases_end(); 5121 HasConstCopyConstructor && Base != BaseEnd; 5122 ++Base) { 5123 CXXRecordDecl *BaseClassDecl 5124 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5125 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5126 DeclareImplicitCopyConstructor(BaseClassDecl); 5127 5128 HasConstCopyConstructor 5129 = BaseClassDecl->hasConstCopyConstructor(Context); 5130 } 5131 5132 // -- for all the nonstatic data members of X that are of a 5133 // class type M (or array thereof), each such class type 5134 // has a copy constructor whose first parameter is of type 5135 // const M& or const volatile M&. 5136 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5137 FieldEnd = ClassDecl->field_end(); 5138 HasConstCopyConstructor && Field != FieldEnd; 5139 ++Field) { 5140 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5141 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5142 CXXRecordDecl *FieldClassDecl 5143 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5144 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5145 DeclareImplicitCopyConstructor(FieldClassDecl); 5146 5147 HasConstCopyConstructor 5148 = FieldClassDecl->hasConstCopyConstructor(Context); 5149 } 5150 } 5151 5152 // Otherwise, the implicitly declared copy constructor will have 5153 // the form 5154 // 5155 // X::X(X&) 5156 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5157 QualType ArgType = ClassType; 5158 if (HasConstCopyConstructor) 5159 ArgType = ArgType.withConst(); 5160 ArgType = Context.getLValueReferenceType(ArgType); 5161 5162 // C++ [except.spec]p14: 5163 // An implicitly declared special member function (Clause 12) shall have an 5164 // exception-specification. [...] 5165 ImplicitExceptionSpecification ExceptSpec(Context); 5166 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5167 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5168 BaseEnd = ClassDecl->bases_end(); 5169 Base != BaseEnd; 5170 ++Base) { 5171 // Virtual bases are handled below. 5172 if (Base->isVirtual()) 5173 continue; 5174 5175 CXXRecordDecl *BaseClassDecl 5176 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5177 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5178 DeclareImplicitCopyConstructor(BaseClassDecl); 5179 5180 if (CXXConstructorDecl *CopyConstructor 5181 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5182 ExceptSpec.CalledDecl(CopyConstructor); 5183 } 5184 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5185 BaseEnd = ClassDecl->vbases_end(); 5186 Base != BaseEnd; 5187 ++Base) { 5188 CXXRecordDecl *BaseClassDecl 5189 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5190 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5191 DeclareImplicitCopyConstructor(BaseClassDecl); 5192 5193 if (CXXConstructorDecl *CopyConstructor 5194 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5195 ExceptSpec.CalledDecl(CopyConstructor); 5196 } 5197 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5198 FieldEnd = ClassDecl->field_end(); 5199 Field != FieldEnd; 5200 ++Field) { 5201 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5202 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5203 CXXRecordDecl *FieldClassDecl 5204 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5205 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5206 DeclareImplicitCopyConstructor(FieldClassDecl); 5207 5208 if (CXXConstructorDecl *CopyConstructor 5209 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5210 ExceptSpec.CalledDecl(CopyConstructor); 5211 } 5212 } 5213 5214 // An implicitly-declared copy constructor is an inline public 5215 // member of its class. 5216 DeclarationName Name 5217 = Context.DeclarationNames.getCXXConstructorName( 5218 Context.getCanonicalType(ClassType)); 5219 CXXConstructorDecl *CopyConstructor 5220 = CXXConstructorDecl::Create(Context, ClassDecl, 5221 ClassDecl->getLocation(), Name, 5222 Context.getFunctionType(Context.VoidTy, 5223 &ArgType, 1, 5224 false, 0, 5225 ExceptSpec.hasExceptionSpecification(), 5226 ExceptSpec.hasAnyExceptionSpecification(), 5227 ExceptSpec.size(), 5228 ExceptSpec.data(), 5229 FunctionType::ExtInfo()), 5230 /*TInfo=*/0, 5231 /*isExplicit=*/false, 5232 /*isInline=*/true, 5233 /*isImplicitlyDeclared=*/true); 5234 CopyConstructor->setAccess(AS_public); 5235 CopyConstructor->setImplicit(); 5236 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5237 5238 // Note that we have declared this constructor. 5239 ClassDecl->setDeclaredCopyConstructor(true); 5240 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5241 5242 // Add the parameter to the constructor. 5243 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5244 ClassDecl->getLocation(), 5245 /*IdentifierInfo=*/0, 5246 ArgType, /*TInfo=*/0, 5247 VarDecl::None, 5248 VarDecl::None, 0); 5249 CopyConstructor->setParams(&FromParam, 1); 5250 if (Scope *S = getScopeForContext(ClassDecl)) 5251 PushOnScopeChains(CopyConstructor, S, false); 5252 ClassDecl->addDecl(CopyConstructor); 5253 5254 return CopyConstructor; 5255} 5256 5257void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5258 CXXConstructorDecl *CopyConstructor, 5259 unsigned TypeQuals) { 5260 assert((CopyConstructor->isImplicit() && 5261 CopyConstructor->isCopyConstructor(TypeQuals) && 5262 !CopyConstructor->isUsed(false)) && 5263 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5264 5265 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5266 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5267 5268 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5269 ErrorTrap Trap(*this); 5270 5271 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5272 Trap.hasErrorOccurred()) { 5273 Diag(CurrentLocation, diag::note_member_synthesized_at) 5274 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5275 CopyConstructor->setInvalidDecl(); 5276 } else { 5277 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5278 CopyConstructor->getLocation(), 5279 MultiStmtArg(*this, 0, 0), 5280 /*isStmtExpr=*/false) 5281 .takeAs<Stmt>()); 5282 } 5283 5284 CopyConstructor->setUsed(); 5285} 5286 5287Sema::OwningExprResult 5288Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5289 CXXConstructorDecl *Constructor, 5290 MultiExprArg ExprArgs, 5291 bool RequiresZeroInit, 5292 CXXConstructExpr::ConstructionKind ConstructKind) { 5293 bool Elidable = false; 5294 5295 // C++0x [class.copy]p34: 5296 // When certain criteria are met, an implementation is allowed to 5297 // omit the copy/move construction of a class object, even if the 5298 // copy/move constructor and/or destructor for the object have 5299 // side effects. [...] 5300 // - when a temporary class object that has not been bound to a 5301 // reference (12.2) would be copied/moved to a class object 5302 // with the same cv-unqualified type, the copy/move operation 5303 // can be omitted by constructing the temporary object 5304 // directly into the target of the omitted copy/move 5305 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5306 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5307 Elidable = SubExpr->isTemporaryObject() && 5308 Context.hasSameUnqualifiedType(SubExpr->getType(), 5309 Context.getTypeDeclType(Constructor->getParent())); 5310 } 5311 5312 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5313 Elidable, move(ExprArgs), RequiresZeroInit, 5314 ConstructKind); 5315} 5316 5317/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5318/// including handling of its default argument expressions. 5319Sema::OwningExprResult 5320Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5321 CXXConstructorDecl *Constructor, bool Elidable, 5322 MultiExprArg ExprArgs, 5323 bool RequiresZeroInit, 5324 CXXConstructExpr::ConstructionKind ConstructKind) { 5325 unsigned NumExprs = ExprArgs.size(); 5326 Expr **Exprs = (Expr **)ExprArgs.release(); 5327 5328 MarkDeclarationReferenced(ConstructLoc, Constructor); 5329 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5330 Constructor, Elidable, Exprs, NumExprs, 5331 RequiresZeroInit, ConstructKind)); 5332} 5333 5334bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5335 CXXConstructorDecl *Constructor, 5336 MultiExprArg Exprs) { 5337 OwningExprResult TempResult = 5338 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5339 move(Exprs)); 5340 if (TempResult.isInvalid()) 5341 return true; 5342 5343 Expr *Temp = TempResult.takeAs<Expr>(); 5344 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5345 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 5346 VD->setInit(Temp); 5347 5348 return false; 5349} 5350 5351void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5352 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5353 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5354 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5355 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5356 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5357 CheckDestructorAccess(VD->getLocation(), Destructor, 5358 PDiag(diag::err_access_dtor_var) 5359 << VD->getDeclName() 5360 << VD->getType()); 5361 5362 if (!VD->isInvalidDecl() && VD->hasGlobalStorage()) 5363 Diag(VD->getLocation(), diag::warn_global_destructor); 5364 } 5365} 5366 5367/// AddCXXDirectInitializerToDecl - This action is called immediately after 5368/// ActOnDeclarator, when a C++ direct initializer is present. 5369/// e.g: "int x(1);" 5370void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 5371 SourceLocation LParenLoc, 5372 MultiExprArg Exprs, 5373 SourceLocation *CommaLocs, 5374 SourceLocation RParenLoc) { 5375 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5376 Decl *RealDecl = Dcl.getAs<Decl>(); 5377 5378 // If there is no declaration, there was an error parsing it. Just ignore 5379 // the initializer. 5380 if (RealDecl == 0) 5381 return; 5382 5383 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5384 if (!VDecl) { 5385 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5386 RealDecl->setInvalidDecl(); 5387 return; 5388 } 5389 5390 // We will represent direct-initialization similarly to copy-initialization: 5391 // int x(1); -as-> int x = 1; 5392 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5393 // 5394 // Clients that want to distinguish between the two forms, can check for 5395 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5396 // A major benefit is that clients that don't particularly care about which 5397 // exactly form was it (like the CodeGen) can handle both cases without 5398 // special case code. 5399 5400 // C++ 8.5p11: 5401 // The form of initialization (using parentheses or '=') is generally 5402 // insignificant, but does matter when the entity being initialized has a 5403 // class type. 5404 5405 if (!VDecl->getType()->isDependentType() && 5406 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5407 diag::err_typecheck_decl_incomplete_type)) { 5408 VDecl->setInvalidDecl(); 5409 return; 5410 } 5411 5412 // The variable can not have an abstract class type. 5413 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5414 diag::err_abstract_type_in_decl, 5415 AbstractVariableType)) 5416 VDecl->setInvalidDecl(); 5417 5418 const VarDecl *Def; 5419 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5420 Diag(VDecl->getLocation(), diag::err_redefinition) 5421 << VDecl->getDeclName(); 5422 Diag(Def->getLocation(), diag::note_previous_definition); 5423 VDecl->setInvalidDecl(); 5424 return; 5425 } 5426 5427 // If either the declaration has a dependent type or if any of the 5428 // expressions is type-dependent, we represent the initialization 5429 // via a ParenListExpr for later use during template instantiation. 5430 if (VDecl->getType()->isDependentType() || 5431 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5432 // Let clients know that initialization was done with a direct initializer. 5433 VDecl->setCXXDirectInitializer(true); 5434 5435 // Store the initialization expressions as a ParenListExpr. 5436 unsigned NumExprs = Exprs.size(); 5437 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5438 (Expr **)Exprs.release(), 5439 NumExprs, RParenLoc)); 5440 return; 5441 } 5442 5443 // Capture the variable that is being initialized and the style of 5444 // initialization. 5445 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5446 5447 // FIXME: Poor source location information. 5448 InitializationKind Kind 5449 = InitializationKind::CreateDirect(VDecl->getLocation(), 5450 LParenLoc, RParenLoc); 5451 5452 InitializationSequence InitSeq(*this, Entity, Kind, 5453 (Expr**)Exprs.get(), Exprs.size()); 5454 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5455 if (Result.isInvalid()) { 5456 VDecl->setInvalidDecl(); 5457 return; 5458 } 5459 5460 Result = MaybeCreateCXXExprWithTemporaries(move(Result)); 5461 VDecl->setInit(Result.takeAs<Expr>()); 5462 VDecl->setCXXDirectInitializer(true); 5463 5464 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5465 FinalizeVarWithDestructor(VDecl, Record); 5466} 5467 5468/// \brief Given a constructor and the set of arguments provided for the 5469/// constructor, convert the arguments and add any required default arguments 5470/// to form a proper call to this constructor. 5471/// 5472/// \returns true if an error occurred, false otherwise. 5473bool 5474Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5475 MultiExprArg ArgsPtr, 5476 SourceLocation Loc, 5477 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 5478 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5479 unsigned NumArgs = ArgsPtr.size(); 5480 Expr **Args = (Expr **)ArgsPtr.get(); 5481 5482 const FunctionProtoType *Proto 5483 = Constructor->getType()->getAs<FunctionProtoType>(); 5484 assert(Proto && "Constructor without a prototype?"); 5485 unsigned NumArgsInProto = Proto->getNumArgs(); 5486 5487 // If too few arguments are available, we'll fill in the rest with defaults. 5488 if (NumArgs < NumArgsInProto) 5489 ConvertedArgs.reserve(NumArgsInProto); 5490 else 5491 ConvertedArgs.reserve(NumArgs); 5492 5493 VariadicCallType CallType = 5494 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5495 llvm::SmallVector<Expr *, 8> AllArgs; 5496 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5497 Proto, 0, Args, NumArgs, AllArgs, 5498 CallType); 5499 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5500 ConvertedArgs.push_back(AllArgs[i]); 5501 return Invalid; 5502} 5503 5504static inline bool 5505CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5506 const FunctionDecl *FnDecl) { 5507 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 5508 if (isa<NamespaceDecl>(DC)) { 5509 return SemaRef.Diag(FnDecl->getLocation(), 5510 diag::err_operator_new_delete_declared_in_namespace) 5511 << FnDecl->getDeclName(); 5512 } 5513 5514 if (isa<TranslationUnitDecl>(DC) && 5515 FnDecl->getStorageClass() == FunctionDecl::Static) { 5516 return SemaRef.Diag(FnDecl->getLocation(), 5517 diag::err_operator_new_delete_declared_static) 5518 << FnDecl->getDeclName(); 5519 } 5520 5521 return false; 5522} 5523 5524static inline bool 5525CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5526 CanQualType ExpectedResultType, 5527 CanQualType ExpectedFirstParamType, 5528 unsigned DependentParamTypeDiag, 5529 unsigned InvalidParamTypeDiag) { 5530 QualType ResultType = 5531 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5532 5533 // Check that the result type is not dependent. 5534 if (ResultType->isDependentType()) 5535 return SemaRef.Diag(FnDecl->getLocation(), 5536 diag::err_operator_new_delete_dependent_result_type) 5537 << FnDecl->getDeclName() << ExpectedResultType; 5538 5539 // Check that the result type is what we expect. 5540 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5541 return SemaRef.Diag(FnDecl->getLocation(), 5542 diag::err_operator_new_delete_invalid_result_type) 5543 << FnDecl->getDeclName() << ExpectedResultType; 5544 5545 // A function template must have at least 2 parameters. 5546 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5547 return SemaRef.Diag(FnDecl->getLocation(), 5548 diag::err_operator_new_delete_template_too_few_parameters) 5549 << FnDecl->getDeclName(); 5550 5551 // The function decl must have at least 1 parameter. 5552 if (FnDecl->getNumParams() == 0) 5553 return SemaRef.Diag(FnDecl->getLocation(), 5554 diag::err_operator_new_delete_too_few_parameters) 5555 << FnDecl->getDeclName(); 5556 5557 // Check the the first parameter type is not dependent. 5558 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5559 if (FirstParamType->isDependentType()) 5560 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5561 << FnDecl->getDeclName() << ExpectedFirstParamType; 5562 5563 // Check that the first parameter type is what we expect. 5564 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5565 ExpectedFirstParamType) 5566 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5567 << FnDecl->getDeclName() << ExpectedFirstParamType; 5568 5569 return false; 5570} 5571 5572static bool 5573CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5574 // C++ [basic.stc.dynamic.allocation]p1: 5575 // A program is ill-formed if an allocation function is declared in a 5576 // namespace scope other than global scope or declared static in global 5577 // scope. 5578 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5579 return true; 5580 5581 CanQualType SizeTy = 5582 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5583 5584 // C++ [basic.stc.dynamic.allocation]p1: 5585 // The return type shall be void*. The first parameter shall have type 5586 // std::size_t. 5587 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5588 SizeTy, 5589 diag::err_operator_new_dependent_param_type, 5590 diag::err_operator_new_param_type)) 5591 return true; 5592 5593 // C++ [basic.stc.dynamic.allocation]p1: 5594 // The first parameter shall not have an associated default argument. 5595 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5596 return SemaRef.Diag(FnDecl->getLocation(), 5597 diag::err_operator_new_default_arg) 5598 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5599 5600 return false; 5601} 5602 5603static bool 5604CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5605 // C++ [basic.stc.dynamic.deallocation]p1: 5606 // A program is ill-formed if deallocation functions are declared in a 5607 // namespace scope other than global scope or declared static in global 5608 // scope. 5609 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5610 return true; 5611 5612 // C++ [basic.stc.dynamic.deallocation]p2: 5613 // Each deallocation function shall return void and its first parameter 5614 // shall be void*. 5615 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5616 SemaRef.Context.VoidPtrTy, 5617 diag::err_operator_delete_dependent_param_type, 5618 diag::err_operator_delete_param_type)) 5619 return true; 5620 5621 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5622 if (FirstParamType->isDependentType()) 5623 return SemaRef.Diag(FnDecl->getLocation(), 5624 diag::err_operator_delete_dependent_param_type) 5625 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5626 5627 if (SemaRef.Context.getCanonicalType(FirstParamType) != 5628 SemaRef.Context.VoidPtrTy) 5629 return SemaRef.Diag(FnDecl->getLocation(), 5630 diag::err_operator_delete_param_type) 5631 << FnDecl->getDeclName() << SemaRef.Context.VoidPtrTy; 5632 5633 return false; 5634} 5635 5636/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5637/// of this overloaded operator is well-formed. If so, returns false; 5638/// otherwise, emits appropriate diagnostics and returns true. 5639bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5640 assert(FnDecl && FnDecl->isOverloadedOperator() && 5641 "Expected an overloaded operator declaration"); 5642 5643 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5644 5645 // C++ [over.oper]p5: 5646 // The allocation and deallocation functions, operator new, 5647 // operator new[], operator delete and operator delete[], are 5648 // described completely in 3.7.3. The attributes and restrictions 5649 // found in the rest of this subclause do not apply to them unless 5650 // explicitly stated in 3.7.3. 5651 if (Op == OO_Delete || Op == OO_Array_Delete) 5652 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5653 5654 if (Op == OO_New || Op == OO_Array_New) 5655 return CheckOperatorNewDeclaration(*this, FnDecl); 5656 5657 // C++ [over.oper]p6: 5658 // An operator function shall either be a non-static member 5659 // function or be a non-member function and have at least one 5660 // parameter whose type is a class, a reference to a class, an 5661 // enumeration, or a reference to an enumeration. 5662 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5663 if (MethodDecl->isStatic()) 5664 return Diag(FnDecl->getLocation(), 5665 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5666 } else { 5667 bool ClassOrEnumParam = false; 5668 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5669 ParamEnd = FnDecl->param_end(); 5670 Param != ParamEnd; ++Param) { 5671 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5672 if (ParamType->isDependentType() || ParamType->isRecordType() || 5673 ParamType->isEnumeralType()) { 5674 ClassOrEnumParam = true; 5675 break; 5676 } 5677 } 5678 5679 if (!ClassOrEnumParam) 5680 return Diag(FnDecl->getLocation(), 5681 diag::err_operator_overload_needs_class_or_enum) 5682 << FnDecl->getDeclName(); 5683 } 5684 5685 // C++ [over.oper]p8: 5686 // An operator function cannot have default arguments (8.3.6), 5687 // except where explicitly stated below. 5688 // 5689 // Only the function-call operator allows default arguments 5690 // (C++ [over.call]p1). 5691 if (Op != OO_Call) { 5692 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5693 Param != FnDecl->param_end(); ++Param) { 5694 if ((*Param)->hasDefaultArg()) 5695 return Diag((*Param)->getLocation(), 5696 diag::err_operator_overload_default_arg) 5697 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5698 } 5699 } 5700 5701 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5702 { false, false, false } 5703#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5704 , { Unary, Binary, MemberOnly } 5705#include "clang/Basic/OperatorKinds.def" 5706 }; 5707 5708 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5709 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5710 bool MustBeMemberOperator = OperatorUses[Op][2]; 5711 5712 // C++ [over.oper]p8: 5713 // [...] Operator functions cannot have more or fewer parameters 5714 // than the number required for the corresponding operator, as 5715 // described in the rest of this subclause. 5716 unsigned NumParams = FnDecl->getNumParams() 5717 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5718 if (Op != OO_Call && 5719 ((NumParams == 1 && !CanBeUnaryOperator) || 5720 (NumParams == 2 && !CanBeBinaryOperator) || 5721 (NumParams < 1) || (NumParams > 2))) { 5722 // We have the wrong number of parameters. 5723 unsigned ErrorKind; 5724 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5725 ErrorKind = 2; // 2 -> unary or binary. 5726 } else if (CanBeUnaryOperator) { 5727 ErrorKind = 0; // 0 -> unary 5728 } else { 5729 assert(CanBeBinaryOperator && 5730 "All non-call overloaded operators are unary or binary!"); 5731 ErrorKind = 1; // 1 -> binary 5732 } 5733 5734 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5735 << FnDecl->getDeclName() << NumParams << ErrorKind; 5736 } 5737 5738 // Overloaded operators other than operator() cannot be variadic. 5739 if (Op != OO_Call && 5740 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5741 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5742 << FnDecl->getDeclName(); 5743 } 5744 5745 // Some operators must be non-static member functions. 5746 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5747 return Diag(FnDecl->getLocation(), 5748 diag::err_operator_overload_must_be_member) 5749 << FnDecl->getDeclName(); 5750 } 5751 5752 // C++ [over.inc]p1: 5753 // The user-defined function called operator++ implements the 5754 // prefix and postfix ++ operator. If this function is a member 5755 // function with no parameters, or a non-member function with one 5756 // parameter of class or enumeration type, it defines the prefix 5757 // increment operator ++ for objects of that type. If the function 5758 // is a member function with one parameter (which shall be of type 5759 // int) or a non-member function with two parameters (the second 5760 // of which shall be of type int), it defines the postfix 5761 // increment operator ++ for objects of that type. 5762 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5763 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5764 bool ParamIsInt = false; 5765 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5766 ParamIsInt = BT->getKind() == BuiltinType::Int; 5767 5768 if (!ParamIsInt) 5769 return Diag(LastParam->getLocation(), 5770 diag::err_operator_overload_post_incdec_must_be_int) 5771 << LastParam->getType() << (Op == OO_MinusMinus); 5772 } 5773 5774 // Notify the class if it got an assignment operator. 5775 if (Op == OO_Equal) { 5776 // Would have returned earlier otherwise. 5777 assert(isa<CXXMethodDecl>(FnDecl) && 5778 "Overloaded = not member, but not filtered."); 5779 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5780 Method->getParent()->addedAssignmentOperator(Context, Method); 5781 } 5782 5783 return false; 5784} 5785 5786/// CheckLiteralOperatorDeclaration - Check whether the declaration 5787/// of this literal operator function is well-formed. If so, returns 5788/// false; otherwise, emits appropriate diagnostics and returns true. 5789bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5790 DeclContext *DC = FnDecl->getDeclContext(); 5791 Decl::Kind Kind = DC->getDeclKind(); 5792 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5793 Kind != Decl::LinkageSpec) { 5794 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5795 << FnDecl->getDeclName(); 5796 return true; 5797 } 5798 5799 bool Valid = false; 5800 5801 // template <char...> type operator "" name() is the only valid template 5802 // signature, and the only valid signature with no parameters. 5803 if (FnDecl->param_size() == 0) { 5804 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5805 // Must have only one template parameter 5806 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5807 if (Params->size() == 1) { 5808 NonTypeTemplateParmDecl *PmDecl = 5809 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5810 5811 // The template parameter must be a char parameter pack. 5812 // FIXME: This test will always fail because non-type parameter packs 5813 // have not been implemented. 5814 if (PmDecl && PmDecl->isTemplateParameterPack() && 5815 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5816 Valid = true; 5817 } 5818 } 5819 } else { 5820 // Check the first parameter 5821 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5822 5823 QualType T = (*Param)->getType(); 5824 5825 // unsigned long long int, long double, and any character type are allowed 5826 // as the only parameters. 5827 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5828 Context.hasSameType(T, Context.LongDoubleTy) || 5829 Context.hasSameType(T, Context.CharTy) || 5830 Context.hasSameType(T, Context.WCharTy) || 5831 Context.hasSameType(T, Context.Char16Ty) || 5832 Context.hasSameType(T, Context.Char32Ty)) { 5833 if (++Param == FnDecl->param_end()) 5834 Valid = true; 5835 goto FinishedParams; 5836 } 5837 5838 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5839 const PointerType *PT = T->getAs<PointerType>(); 5840 if (!PT) 5841 goto FinishedParams; 5842 T = PT->getPointeeType(); 5843 if (!T.isConstQualified()) 5844 goto FinishedParams; 5845 T = T.getUnqualifiedType(); 5846 5847 // Move on to the second parameter; 5848 ++Param; 5849 5850 // If there is no second parameter, the first must be a const char * 5851 if (Param == FnDecl->param_end()) { 5852 if (Context.hasSameType(T, Context.CharTy)) 5853 Valid = true; 5854 goto FinishedParams; 5855 } 5856 5857 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5858 // are allowed as the first parameter to a two-parameter function 5859 if (!(Context.hasSameType(T, Context.CharTy) || 5860 Context.hasSameType(T, Context.WCharTy) || 5861 Context.hasSameType(T, Context.Char16Ty) || 5862 Context.hasSameType(T, Context.Char32Ty))) 5863 goto FinishedParams; 5864 5865 // The second and final parameter must be an std::size_t 5866 T = (*Param)->getType().getUnqualifiedType(); 5867 if (Context.hasSameType(T, Context.getSizeType()) && 5868 ++Param == FnDecl->param_end()) 5869 Valid = true; 5870 } 5871 5872 // FIXME: This diagnostic is absolutely terrible. 5873FinishedParams: 5874 if (!Valid) { 5875 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 5876 << FnDecl->getDeclName(); 5877 return true; 5878 } 5879 5880 return false; 5881} 5882 5883/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 5884/// linkage specification, including the language and (if present) 5885/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 5886/// the location of the language string literal, which is provided 5887/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 5888/// the '{' brace. Otherwise, this linkage specification does not 5889/// have any braces. 5890Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 5891 SourceLocation ExternLoc, 5892 SourceLocation LangLoc, 5893 llvm::StringRef Lang, 5894 SourceLocation LBraceLoc) { 5895 LinkageSpecDecl::LanguageIDs Language; 5896 if (Lang == "\"C\"") 5897 Language = LinkageSpecDecl::lang_c; 5898 else if (Lang == "\"C++\"") 5899 Language = LinkageSpecDecl::lang_cxx; 5900 else { 5901 Diag(LangLoc, diag::err_bad_language); 5902 return DeclPtrTy(); 5903 } 5904 5905 // FIXME: Add all the various semantics of linkage specifications 5906 5907 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 5908 LangLoc, Language, 5909 LBraceLoc.isValid()); 5910 CurContext->addDecl(D); 5911 PushDeclContext(S, D); 5912 return DeclPtrTy::make(D); 5913} 5914 5915/// ActOnFinishLinkageSpecification - Complete the definition of 5916/// the C++ linkage specification LinkageSpec. If RBraceLoc is 5917/// valid, it's the position of the closing '}' brace in a linkage 5918/// specification that uses braces. 5919Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 5920 DeclPtrTy LinkageSpec, 5921 SourceLocation RBraceLoc) { 5922 if (LinkageSpec) 5923 PopDeclContext(); 5924 return LinkageSpec; 5925} 5926 5927/// \brief Perform semantic analysis for the variable declaration that 5928/// occurs within a C++ catch clause, returning the newly-created 5929/// variable. 5930VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 5931 TypeSourceInfo *TInfo, 5932 IdentifierInfo *Name, 5933 SourceLocation Loc, 5934 SourceRange Range) { 5935 bool Invalid = false; 5936 5937 // Arrays and functions decay. 5938 if (ExDeclType->isArrayType()) 5939 ExDeclType = Context.getArrayDecayedType(ExDeclType); 5940 else if (ExDeclType->isFunctionType()) 5941 ExDeclType = Context.getPointerType(ExDeclType); 5942 5943 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 5944 // The exception-declaration shall not denote a pointer or reference to an 5945 // incomplete type, other than [cv] void*. 5946 // N2844 forbids rvalue references. 5947 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 5948 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 5949 Invalid = true; 5950 } 5951 5952 // GCC allows catching pointers and references to incomplete types 5953 // as an extension; so do we, but we warn by default. 5954 5955 QualType BaseType = ExDeclType; 5956 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 5957 unsigned DK = diag::err_catch_incomplete; 5958 bool IncompleteCatchIsInvalid = true; 5959 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 5960 BaseType = Ptr->getPointeeType(); 5961 Mode = 1; 5962 DK = diag::ext_catch_incomplete_ptr; 5963 IncompleteCatchIsInvalid = false; 5964 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 5965 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 5966 BaseType = Ref->getPointeeType(); 5967 Mode = 2; 5968 DK = diag::ext_catch_incomplete_ref; 5969 IncompleteCatchIsInvalid = false; 5970 } 5971 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 5972 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 5973 IncompleteCatchIsInvalid) 5974 Invalid = true; 5975 5976 if (!Invalid && !ExDeclType->isDependentType() && 5977 RequireNonAbstractType(Loc, ExDeclType, 5978 diag::err_abstract_type_in_decl, 5979 AbstractVariableType)) 5980 Invalid = true; 5981 5982 // Only the non-fragile NeXT runtime currently supports C++ catches 5983 // of ObjC types, and no runtime supports catching ObjC types by value. 5984 if (!Invalid && getLangOptions().ObjC1) { 5985 QualType T = ExDeclType; 5986 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 5987 T = RT->getPointeeType(); 5988 5989 if (T->isObjCObjectType()) { 5990 Diag(Loc, diag::err_objc_object_catch); 5991 Invalid = true; 5992 } else if (T->isObjCObjectPointerType()) { 5993 if (!getLangOptions().NeXTRuntime) { 5994 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 5995 Invalid = true; 5996 } else if (!getLangOptions().ObjCNonFragileABI) { 5997 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 5998 Invalid = true; 5999 } 6000 } 6001 } 6002 6003 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6004 Name, ExDeclType, TInfo, VarDecl::None, 6005 VarDecl::None); 6006 ExDecl->setExceptionVariable(true); 6007 6008 if (!Invalid) { 6009 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6010 // C++ [except.handle]p16: 6011 // The object declared in an exception-declaration or, if the 6012 // exception-declaration does not specify a name, a temporary (12.2) is 6013 // copy-initialized (8.5) from the exception object. [...] 6014 // The object is destroyed when the handler exits, after the destruction 6015 // of any automatic objects initialized within the handler. 6016 // 6017 // We just pretend to initialize the object with itself, then make sure 6018 // it can be destroyed later. 6019 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6020 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6021 Loc, ExDeclType, 0); 6022 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6023 SourceLocation()); 6024 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6025 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6026 MultiExprArg(*this, (void**)&ExDeclRef, 1)); 6027 if (Result.isInvalid()) 6028 Invalid = true; 6029 else 6030 FinalizeVarWithDestructor(ExDecl, RecordTy); 6031 } 6032 } 6033 6034 if (Invalid) 6035 ExDecl->setInvalidDecl(); 6036 6037 return ExDecl; 6038} 6039 6040/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6041/// handler. 6042Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6043 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6044 QualType ExDeclType = TInfo->getType(); 6045 6046 bool Invalid = D.isInvalidType(); 6047 IdentifierInfo *II = D.getIdentifier(); 6048 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6049 LookupOrdinaryName, 6050 ForRedeclaration)) { 6051 // The scope should be freshly made just for us. There is just no way 6052 // it contains any previous declaration. 6053 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 6054 if (PrevDecl->isTemplateParameter()) { 6055 // Maybe we will complain about the shadowed template parameter. 6056 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6057 } 6058 } 6059 6060 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6061 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6062 << D.getCXXScopeSpec().getRange(); 6063 Invalid = true; 6064 } 6065 6066 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 6067 D.getIdentifier(), 6068 D.getIdentifierLoc(), 6069 D.getDeclSpec().getSourceRange()); 6070 6071 if (Invalid) 6072 ExDecl->setInvalidDecl(); 6073 6074 // Add the exception declaration into this scope. 6075 if (II) 6076 PushOnScopeChains(ExDecl, S); 6077 else 6078 CurContext->addDecl(ExDecl); 6079 6080 ProcessDeclAttributes(S, ExDecl, D); 6081 return DeclPtrTy::make(ExDecl); 6082} 6083 6084Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6085 ExprArg assertexpr, 6086 ExprArg assertmessageexpr) { 6087 Expr *AssertExpr = (Expr *)assertexpr.get(); 6088 StringLiteral *AssertMessage = 6089 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 6090 6091 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6092 llvm::APSInt Value(32); 6093 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6094 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6095 AssertExpr->getSourceRange(); 6096 return DeclPtrTy(); 6097 } 6098 6099 if (Value == 0) { 6100 Diag(AssertLoc, diag::err_static_assert_failed) 6101 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6102 } 6103 } 6104 6105 assertexpr.release(); 6106 assertmessageexpr.release(); 6107 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6108 AssertExpr, AssertMessage); 6109 6110 CurContext->addDecl(Decl); 6111 return DeclPtrTy::make(Decl); 6112} 6113 6114/// \brief Perform semantic analysis of the given friend type declaration. 6115/// 6116/// \returns A friend declaration that. 6117FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6118 TypeSourceInfo *TSInfo) { 6119 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6120 6121 QualType T = TSInfo->getType(); 6122 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6123 6124 if (!getLangOptions().CPlusPlus0x) { 6125 // C++03 [class.friend]p2: 6126 // An elaborated-type-specifier shall be used in a friend declaration 6127 // for a class.* 6128 // 6129 // * The class-key of the elaborated-type-specifier is required. 6130 if (!ActiveTemplateInstantiations.empty()) { 6131 // Do not complain about the form of friend template types during 6132 // template instantiation; we will already have complained when the 6133 // template was declared. 6134 } else if (!T->isElaboratedTypeSpecifier()) { 6135 // If we evaluated the type to a record type, suggest putting 6136 // a tag in front. 6137 if (const RecordType *RT = T->getAs<RecordType>()) { 6138 RecordDecl *RD = RT->getDecl(); 6139 6140 std::string InsertionText = std::string(" ") + RD->getKindName(); 6141 6142 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6143 << (unsigned) RD->getTagKind() 6144 << T 6145 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6146 InsertionText); 6147 } else { 6148 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6149 << T 6150 << SourceRange(FriendLoc, TypeRange.getEnd()); 6151 } 6152 } else if (T->getAs<EnumType>()) { 6153 Diag(FriendLoc, diag::ext_enum_friend) 6154 << T 6155 << SourceRange(FriendLoc, TypeRange.getEnd()); 6156 } 6157 } 6158 6159 // C++0x [class.friend]p3: 6160 // If the type specifier in a friend declaration designates a (possibly 6161 // cv-qualified) class type, that class is declared as a friend; otherwise, 6162 // the friend declaration is ignored. 6163 6164 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6165 // in [class.friend]p3 that we do not implement. 6166 6167 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6168} 6169 6170/// Handle a friend type declaration. This works in tandem with 6171/// ActOnTag. 6172/// 6173/// Notes on friend class templates: 6174/// 6175/// We generally treat friend class declarations as if they were 6176/// declaring a class. So, for example, the elaborated type specifier 6177/// in a friend declaration is required to obey the restrictions of a 6178/// class-head (i.e. no typedefs in the scope chain), template 6179/// parameters are required to match up with simple template-ids, &c. 6180/// However, unlike when declaring a template specialization, it's 6181/// okay to refer to a template specialization without an empty 6182/// template parameter declaration, e.g. 6183/// friend class A<T>::B<unsigned>; 6184/// We permit this as a special case; if there are any template 6185/// parameters present at all, require proper matching, i.e. 6186/// template <> template <class T> friend class A<int>::B; 6187Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6188 MultiTemplateParamsArg TempParams) { 6189 SourceLocation Loc = DS.getSourceRange().getBegin(); 6190 6191 assert(DS.isFriendSpecified()); 6192 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6193 6194 // Try to convert the decl specifier to a type. This works for 6195 // friend templates because ActOnTag never produces a ClassTemplateDecl 6196 // for a TUK_Friend. 6197 Declarator TheDeclarator(DS, Declarator::MemberContext); 6198 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6199 QualType T = TSI->getType(); 6200 if (TheDeclarator.isInvalidType()) 6201 return DeclPtrTy(); 6202 6203 // This is definitely an error in C++98. It's probably meant to 6204 // be forbidden in C++0x, too, but the specification is just 6205 // poorly written. 6206 // 6207 // The problem is with declarations like the following: 6208 // template <T> friend A<T>::foo; 6209 // where deciding whether a class C is a friend or not now hinges 6210 // on whether there exists an instantiation of A that causes 6211 // 'foo' to equal C. There are restrictions on class-heads 6212 // (which we declare (by fiat) elaborated friend declarations to 6213 // be) that makes this tractable. 6214 // 6215 // FIXME: handle "template <> friend class A<T>;", which 6216 // is possibly well-formed? Who even knows? 6217 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6218 Diag(Loc, diag::err_tagless_friend_type_template) 6219 << DS.getSourceRange(); 6220 return DeclPtrTy(); 6221 } 6222 6223 // C++98 [class.friend]p1: A friend of a class is a function 6224 // or class that is not a member of the class . . . 6225 // This is fixed in DR77, which just barely didn't make the C++03 6226 // deadline. It's also a very silly restriction that seriously 6227 // affects inner classes and which nobody else seems to implement; 6228 // thus we never diagnose it, not even in -pedantic. 6229 // 6230 // But note that we could warn about it: it's always useless to 6231 // friend one of your own members (it's not, however, worthless to 6232 // friend a member of an arbitrary specialization of your template). 6233 6234 Decl *D; 6235 if (unsigned NumTempParamLists = TempParams.size()) 6236 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6237 NumTempParamLists, 6238 (TemplateParameterList**) TempParams.release(), 6239 TSI, 6240 DS.getFriendSpecLoc()); 6241 else 6242 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6243 6244 if (!D) 6245 return DeclPtrTy(); 6246 6247 D->setAccess(AS_public); 6248 CurContext->addDecl(D); 6249 6250 return DeclPtrTy::make(D); 6251} 6252 6253Sema::DeclPtrTy 6254Sema::ActOnFriendFunctionDecl(Scope *S, 6255 Declarator &D, 6256 bool IsDefinition, 6257 MultiTemplateParamsArg TemplateParams) { 6258 const DeclSpec &DS = D.getDeclSpec(); 6259 6260 assert(DS.isFriendSpecified()); 6261 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6262 6263 SourceLocation Loc = D.getIdentifierLoc(); 6264 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6265 QualType T = TInfo->getType(); 6266 6267 // C++ [class.friend]p1 6268 // A friend of a class is a function or class.... 6269 // Note that this sees through typedefs, which is intended. 6270 // It *doesn't* see through dependent types, which is correct 6271 // according to [temp.arg.type]p3: 6272 // If a declaration acquires a function type through a 6273 // type dependent on a template-parameter and this causes 6274 // a declaration that does not use the syntactic form of a 6275 // function declarator to have a function type, the program 6276 // is ill-formed. 6277 if (!T->isFunctionType()) { 6278 Diag(Loc, diag::err_unexpected_friend); 6279 6280 // It might be worthwhile to try to recover by creating an 6281 // appropriate declaration. 6282 return DeclPtrTy(); 6283 } 6284 6285 // C++ [namespace.memdef]p3 6286 // - If a friend declaration in a non-local class first declares a 6287 // class or function, the friend class or function is a member 6288 // of the innermost enclosing namespace. 6289 // - The name of the friend is not found by simple name lookup 6290 // until a matching declaration is provided in that namespace 6291 // scope (either before or after the class declaration granting 6292 // friendship). 6293 // - If a friend function is called, its name may be found by the 6294 // name lookup that considers functions from namespaces and 6295 // classes associated with the types of the function arguments. 6296 // - When looking for a prior declaration of a class or a function 6297 // declared as a friend, scopes outside the innermost enclosing 6298 // namespace scope are not considered. 6299 6300 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 6301 DeclarationName Name = GetNameForDeclarator(D); 6302 assert(Name); 6303 6304 // The context we found the declaration in, or in which we should 6305 // create the declaration. 6306 DeclContext *DC; 6307 6308 // FIXME: handle local classes 6309 6310 // Recover from invalid scope qualifiers as if they just weren't there. 6311 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 6312 ForRedeclaration); 6313 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 6314 DC = computeDeclContext(ScopeQual); 6315 6316 // FIXME: handle dependent contexts 6317 if (!DC) return DeclPtrTy(); 6318 if (RequireCompleteDeclContext(ScopeQual, DC)) return DeclPtrTy(); 6319 6320 LookupQualifiedName(Previous, DC); 6321 6322 // Ignore things found implicitly in the wrong scope. 6323 // TODO: better diagnostics for this case. Suggesting the right 6324 // qualified scope would be nice... 6325 LookupResult::Filter F = Previous.makeFilter(); 6326 while (F.hasNext()) { 6327 NamedDecl *D = F.next(); 6328 if (!D->getDeclContext()->getLookupContext()->Equals(DC)) 6329 F.erase(); 6330 } 6331 F.done(); 6332 6333 if (Previous.empty()) { 6334 D.setInvalidType(); 6335 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6336 return DeclPtrTy(); 6337 } 6338 6339 // C++ [class.friend]p1: A friend of a class is a function or 6340 // class that is not a member of the class . . . 6341 if (DC->Equals(CurContext)) 6342 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6343 6344 // Otherwise walk out to the nearest namespace scope looking for matches. 6345 } else { 6346 // TODO: handle local class contexts. 6347 6348 DC = CurContext; 6349 while (true) { 6350 // Skip class contexts. If someone can cite chapter and verse 6351 // for this behavior, that would be nice --- it's what GCC and 6352 // EDG do, and it seems like a reasonable intent, but the spec 6353 // really only says that checks for unqualified existing 6354 // declarations should stop at the nearest enclosing namespace, 6355 // not that they should only consider the nearest enclosing 6356 // namespace. 6357 while (DC->isRecord()) 6358 DC = DC->getParent(); 6359 6360 LookupQualifiedName(Previous, DC); 6361 6362 // TODO: decide what we think about using declarations. 6363 if (!Previous.empty()) 6364 break; 6365 6366 if (DC->isFileContext()) break; 6367 DC = DC->getParent(); 6368 } 6369 6370 // C++ [class.friend]p1: A friend of a class is a function or 6371 // class that is not a member of the class . . . 6372 // C++0x changes this for both friend types and functions. 6373 // Most C++ 98 compilers do seem to give an error here, so 6374 // we do, too. 6375 if (!Previous.empty() && DC->Equals(CurContext) 6376 && !getLangOptions().CPlusPlus0x) 6377 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6378 } 6379 6380 if (DC->isFileContext()) { 6381 // This implies that it has to be an operator or function. 6382 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6383 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6384 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6385 Diag(Loc, diag::err_introducing_special_friend) << 6386 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6387 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6388 return DeclPtrTy(); 6389 } 6390 } 6391 6392 bool Redeclaration = false; 6393 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 6394 move(TemplateParams), 6395 IsDefinition, 6396 Redeclaration); 6397 if (!ND) return DeclPtrTy(); 6398 6399 assert(ND->getDeclContext() == DC); 6400 assert(ND->getLexicalDeclContext() == CurContext); 6401 6402 // Add the function declaration to the appropriate lookup tables, 6403 // adjusting the redeclarations list as necessary. We don't 6404 // want to do this yet if the friending class is dependent. 6405 // 6406 // Also update the scope-based lookup if the target context's 6407 // lookup context is in lexical scope. 6408 if (!CurContext->isDependentContext()) { 6409 DC = DC->getLookupContext(); 6410 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6411 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6412 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6413 } 6414 6415 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6416 D.getIdentifierLoc(), ND, 6417 DS.getFriendSpecLoc()); 6418 FrD->setAccess(AS_public); 6419 CurContext->addDecl(FrD); 6420 6421 return DeclPtrTy::make(ND); 6422} 6423 6424void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 6425 AdjustDeclIfTemplate(dcl); 6426 6427 Decl *Dcl = dcl.getAs<Decl>(); 6428 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6429 if (!Fn) { 6430 Diag(DelLoc, diag::err_deleted_non_function); 6431 return; 6432 } 6433 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6434 Diag(DelLoc, diag::err_deleted_decl_not_first); 6435 Diag(Prev->getLocation(), diag::note_previous_declaration); 6436 // If the declaration wasn't the first, we delete the function anyway for 6437 // recovery. 6438 } 6439 Fn->setDeleted(); 6440} 6441 6442static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6443 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6444 ++CI) { 6445 Stmt *SubStmt = *CI; 6446 if (!SubStmt) 6447 continue; 6448 if (isa<ReturnStmt>(SubStmt)) 6449 Self.Diag(SubStmt->getSourceRange().getBegin(), 6450 diag::err_return_in_constructor_handler); 6451 if (!isa<Expr>(SubStmt)) 6452 SearchForReturnInStmt(Self, SubStmt); 6453 } 6454} 6455 6456void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6457 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6458 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6459 SearchForReturnInStmt(*this, Handler); 6460 } 6461} 6462 6463bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6464 const CXXMethodDecl *Old) { 6465 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6466 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6467 6468 if (Context.hasSameType(NewTy, OldTy) || 6469 NewTy->isDependentType() || OldTy->isDependentType()) 6470 return false; 6471 6472 // Check if the return types are covariant 6473 QualType NewClassTy, OldClassTy; 6474 6475 /// Both types must be pointers or references to classes. 6476 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6477 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6478 NewClassTy = NewPT->getPointeeType(); 6479 OldClassTy = OldPT->getPointeeType(); 6480 } 6481 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6482 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6483 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6484 NewClassTy = NewRT->getPointeeType(); 6485 OldClassTy = OldRT->getPointeeType(); 6486 } 6487 } 6488 } 6489 6490 // The return types aren't either both pointers or references to a class type. 6491 if (NewClassTy.isNull()) { 6492 Diag(New->getLocation(), 6493 diag::err_different_return_type_for_overriding_virtual_function) 6494 << New->getDeclName() << NewTy << OldTy; 6495 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6496 6497 return true; 6498 } 6499 6500 // C++ [class.virtual]p6: 6501 // If the return type of D::f differs from the return type of B::f, the 6502 // class type in the return type of D::f shall be complete at the point of 6503 // declaration of D::f or shall be the class type D. 6504 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6505 if (!RT->isBeingDefined() && 6506 RequireCompleteType(New->getLocation(), NewClassTy, 6507 PDiag(diag::err_covariant_return_incomplete) 6508 << New->getDeclName())) 6509 return true; 6510 } 6511 6512 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6513 // Check if the new class derives from the old class. 6514 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6515 Diag(New->getLocation(), 6516 diag::err_covariant_return_not_derived) 6517 << New->getDeclName() << NewTy << OldTy; 6518 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6519 return true; 6520 } 6521 6522 // Check if we the conversion from derived to base is valid. 6523 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6524 diag::err_covariant_return_inaccessible_base, 6525 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6526 // FIXME: Should this point to the return type? 6527 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6528 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6529 return true; 6530 } 6531 } 6532 6533 // The qualifiers of the return types must be the same. 6534 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6535 Diag(New->getLocation(), 6536 diag::err_covariant_return_type_different_qualifications) 6537 << New->getDeclName() << NewTy << OldTy; 6538 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6539 return true; 6540 }; 6541 6542 6543 // The new class type must have the same or less qualifiers as the old type. 6544 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6545 Diag(New->getLocation(), 6546 diag::err_covariant_return_type_class_type_more_qualified) 6547 << New->getDeclName() << NewTy << OldTy; 6548 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6549 return true; 6550 }; 6551 6552 return false; 6553} 6554 6555bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6556 const CXXMethodDecl *Old) 6557{ 6558 if (Old->hasAttr<FinalAttr>()) { 6559 Diag(New->getLocation(), diag::err_final_function_overridden) 6560 << New->getDeclName(); 6561 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6562 return true; 6563 } 6564 6565 return false; 6566} 6567 6568/// \brief Mark the given method pure. 6569/// 6570/// \param Method the method to be marked pure. 6571/// 6572/// \param InitRange the source range that covers the "0" initializer. 6573bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6574 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6575 Method->setPure(); 6576 6577 // A class is abstract if at least one function is pure virtual. 6578 Method->getParent()->setAbstract(true); 6579 return false; 6580 } 6581 6582 if (!Method->isInvalidDecl()) 6583 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6584 << Method->getDeclName() << InitRange; 6585 return true; 6586} 6587 6588/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6589/// an initializer for the out-of-line declaration 'Dcl'. The scope 6590/// is a fresh scope pushed for just this purpose. 6591/// 6592/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6593/// static data member of class X, names should be looked up in the scope of 6594/// class X. 6595void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6596 // If there is no declaration, there was an error parsing it. 6597 Decl *D = Dcl.getAs<Decl>(); 6598 if (D == 0) return; 6599 6600 // We should only get called for declarations with scope specifiers, like: 6601 // int foo::bar; 6602 assert(D->isOutOfLine()); 6603 EnterDeclaratorContext(S, D->getDeclContext()); 6604} 6605 6606/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6607/// initializer for the out-of-line declaration 'Dcl'. 6608void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 6609 // If there is no declaration, there was an error parsing it. 6610 Decl *D = Dcl.getAs<Decl>(); 6611 if (D == 0) return; 6612 6613 assert(D->isOutOfLine()); 6614 ExitDeclaratorContext(S); 6615} 6616 6617/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6618/// C++ if/switch/while/for statement. 6619/// e.g: "if (int x = f()) {...}" 6620Action::DeclResult 6621Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6622 // C++ 6.4p2: 6623 // The declarator shall not specify a function or an array. 6624 // The type-specifier-seq shall not contain typedef and shall not declare a 6625 // new class or enumeration. 6626 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6627 "Parser allowed 'typedef' as storage class of condition decl."); 6628 6629 TagDecl *OwnedTag = 0; 6630 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6631 QualType Ty = TInfo->getType(); 6632 6633 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6634 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6635 // would be created and CXXConditionDeclExpr wants a VarDecl. 6636 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6637 << D.getSourceRange(); 6638 return DeclResult(); 6639 } else if (OwnedTag && OwnedTag->isDefinition()) { 6640 // The type-specifier-seq shall not declare a new class or enumeration. 6641 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6642 } 6643 6644 DeclPtrTy Dcl = ActOnDeclarator(S, D); 6645 if (!Dcl) 6646 return DeclResult(); 6647 6648 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 6649 VD->setDeclaredInCondition(true); 6650 return Dcl; 6651} 6652 6653void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6654 bool DefinitionRequired) { 6655 // Ignore any vtable uses in unevaluated operands or for classes that do 6656 // not have a vtable. 6657 if (!Class->isDynamicClass() || Class->isDependentContext() || 6658 CurContext->isDependentContext() || 6659 ExprEvalContexts.back().Context == Unevaluated) 6660 return; 6661 6662 // Try to insert this class into the map. 6663 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6664 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6665 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6666 if (!Pos.second) { 6667 // If we already had an entry, check to see if we are promoting this vtable 6668 // to required a definition. If so, we need to reappend to the VTableUses 6669 // list, since we may have already processed the first entry. 6670 if (DefinitionRequired && !Pos.first->second) { 6671 Pos.first->second = true; 6672 } else { 6673 // Otherwise, we can early exit. 6674 return; 6675 } 6676 } 6677 6678 // Local classes need to have their virtual members marked 6679 // immediately. For all other classes, we mark their virtual members 6680 // at the end of the translation unit. 6681 if (Class->isLocalClass()) 6682 MarkVirtualMembersReferenced(Loc, Class); 6683 else 6684 VTableUses.push_back(std::make_pair(Class, Loc)); 6685} 6686 6687bool Sema::DefineUsedVTables() { 6688 // If any dynamic classes have their key function defined within 6689 // this translation unit, then those vtables are considered "used" and must 6690 // be emitted. 6691 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6692 if (const CXXMethodDecl *KeyFunction 6693 = Context.getKeyFunction(DynamicClasses[I])) { 6694 const FunctionDecl *Definition = 0; 6695 if (KeyFunction->hasBody(Definition)) 6696 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6697 } 6698 } 6699 6700 if (VTableUses.empty()) 6701 return false; 6702 6703 // Note: The VTableUses vector could grow as a result of marking 6704 // the members of a class as "used", so we check the size each 6705 // time through the loop and prefer indices (with are stable) to 6706 // iterators (which are not). 6707 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6708 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6709 if (!Class) 6710 continue; 6711 6712 SourceLocation Loc = VTableUses[I].second; 6713 6714 // If this class has a key function, but that key function is 6715 // defined in another translation unit, we don't need to emit the 6716 // vtable even though we're using it. 6717 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6718 if (KeyFunction && !KeyFunction->hasBody()) { 6719 switch (KeyFunction->getTemplateSpecializationKind()) { 6720 case TSK_Undeclared: 6721 case TSK_ExplicitSpecialization: 6722 case TSK_ExplicitInstantiationDeclaration: 6723 // The key function is in another translation unit. 6724 continue; 6725 6726 case TSK_ExplicitInstantiationDefinition: 6727 case TSK_ImplicitInstantiation: 6728 // We will be instantiating the key function. 6729 break; 6730 } 6731 } else if (!KeyFunction) { 6732 // If we have a class with no key function that is the subject 6733 // of an explicit instantiation declaration, suppress the 6734 // vtable; it will live with the explicit instantiation 6735 // definition. 6736 bool IsExplicitInstantiationDeclaration 6737 = Class->getTemplateSpecializationKind() 6738 == TSK_ExplicitInstantiationDeclaration; 6739 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6740 REnd = Class->redecls_end(); 6741 R != REnd; ++R) { 6742 TemplateSpecializationKind TSK 6743 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6744 if (TSK == TSK_ExplicitInstantiationDeclaration) 6745 IsExplicitInstantiationDeclaration = true; 6746 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6747 IsExplicitInstantiationDeclaration = false; 6748 break; 6749 } 6750 } 6751 6752 if (IsExplicitInstantiationDeclaration) 6753 continue; 6754 } 6755 6756 // Mark all of the virtual members of this class as referenced, so 6757 // that we can build a vtable. Then, tell the AST consumer that a 6758 // vtable for this class is required. 6759 MarkVirtualMembersReferenced(Loc, Class); 6760 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6761 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6762 6763 // Optionally warn if we're emitting a weak vtable. 6764 if (Class->getLinkage() == ExternalLinkage && 6765 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6766 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 6767 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6768 } 6769 } 6770 VTableUses.clear(); 6771 6772 return true; 6773} 6774 6775void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6776 const CXXRecordDecl *RD) { 6777 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6778 e = RD->method_end(); i != e; ++i) { 6779 CXXMethodDecl *MD = *i; 6780 6781 // C++ [basic.def.odr]p2: 6782 // [...] A virtual member function is used if it is not pure. [...] 6783 if (MD->isVirtual() && !MD->isPure()) 6784 MarkDeclarationReferenced(Loc, MD); 6785 } 6786 6787 // Only classes that have virtual bases need a VTT. 6788 if (RD->getNumVBases() == 0) 6789 return; 6790 6791 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6792 e = RD->bases_end(); i != e; ++i) { 6793 const CXXRecordDecl *Base = 6794 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6795 if (i->isVirtual()) 6796 continue; 6797 if (Base->getNumVBases() == 0) 6798 continue; 6799 MarkVirtualMembersReferenced(Loc, Base); 6800 } 6801} 6802 6803/// SetIvarInitializers - This routine builds initialization ASTs for the 6804/// Objective-C implementation whose ivars need be initialized. 6805void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6806 if (!getLangOptions().CPlusPlus) 6807 return; 6808 if (const ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6809 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6810 CollectIvarsToConstructOrDestruct(OID, ivars); 6811 if (ivars.empty()) 6812 return; 6813 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6814 for (unsigned i = 0; i < ivars.size(); i++) { 6815 FieldDecl *Field = ivars[i]; 6816 if (Field->isInvalidDecl()) 6817 continue; 6818 6819 CXXBaseOrMemberInitializer *Member; 6820 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6821 InitializationKind InitKind = 6822 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6823 6824 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6825 Sema::OwningExprResult MemberInit = 6826 InitSeq.Perform(*this, InitEntity, InitKind, 6827 Sema::MultiExprArg(*this, 0, 0)); 6828 MemberInit = MaybeCreateCXXExprWithTemporaries(move(MemberInit)); 6829 // Note, MemberInit could actually come back empty if no initialization 6830 // is required (e.g., because it would call a trivial default constructor) 6831 if (!MemberInit.get() || MemberInit.isInvalid()) 6832 continue; 6833 6834 Member = 6835 new (Context) CXXBaseOrMemberInitializer(Context, 6836 Field, SourceLocation(), 6837 SourceLocation(), 6838 MemberInit.takeAs<Expr>(), 6839 SourceLocation()); 6840 AllToInit.push_back(Member); 6841 6842 // Be sure that the destructor is accessible and is marked as referenced. 6843 if (const RecordType *RecordTy 6844 = Context.getBaseElementType(Field->getType()) 6845 ->getAs<RecordType>()) { 6846 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6847 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 6848 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6849 CheckDestructorAccess(Field->getLocation(), Destructor, 6850 PDiag(diag::err_access_dtor_ivar) 6851 << Context.getBaseElementType(Field->getType())); 6852 } 6853 } 6854 } 6855 ObjCImplementation->setIvarInitializers(Context, 6856 AllToInit.data(), AllToInit.size()); 6857 } 6858} 6859