SemaDeclCXX.cpp revision 212904
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 "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/CharUnits.h" 22#include "clang/AST/CXXInheritance.h" 23#include "clang/AST/DeclVisitor.h" 24#include "clang/AST/RecordLayout.h" 25#include "clang/AST/StmtVisitor.h" 26#include "clang/AST/TypeLoc.h" 27#include "clang/AST/TypeOrdering.h" 28#include "clang/Sema/DeclSpec.h" 29#include "clang/Sema/ParsedTemplate.h" 30#include "clang/Basic/PartialDiagnostic.h" 31#include "clang/Lex/Preprocessor.h" 32#include "llvm/ADT/DenseSet.h" 33#include "llvm/ADT/STLExtras.h" 34#include <map> 35#include <set> 36 37using namespace clang; 38 39//===----------------------------------------------------------------------===// 40// CheckDefaultArgumentVisitor 41//===----------------------------------------------------------------------===// 42 43namespace { 44 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 45 /// the default argument of a parameter to determine whether it 46 /// contains any ill-formed subexpressions. For example, this will 47 /// diagnose the use of local variables or parameters within the 48 /// default argument expression. 49 class CheckDefaultArgumentVisitor 50 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 51 Expr *DefaultArg; 52 Sema *S; 53 54 public: 55 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 56 : DefaultArg(defarg), S(s) {} 57 58 bool VisitExpr(Expr *Node); 59 bool VisitDeclRefExpr(DeclRefExpr *DRE); 60 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 61 }; 62 63 /// VisitExpr - Visit all of the children of this expression. 64 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 65 bool IsInvalid = false; 66 for (Stmt::child_iterator I = Node->child_begin(), 67 E = Node->child_end(); I != E; ++I) 68 IsInvalid |= Visit(*I); 69 return IsInvalid; 70 } 71 72 /// VisitDeclRefExpr - Visit a reference to a declaration, to 73 /// determine whether this declaration can be used in the default 74 /// argument expression. 75 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 76 NamedDecl *Decl = DRE->getDecl(); 77 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 78 // C++ [dcl.fct.default]p9 79 // Default arguments are evaluated each time the function is 80 // called. The order of evaluation of function arguments is 81 // unspecified. Consequently, parameters of a function shall not 82 // be used in default argument expressions, even if they are not 83 // evaluated. Parameters of a function declared before a default 84 // argument expression are in scope and can hide namespace and 85 // class member names. 86 return S->Diag(DRE->getSourceRange().getBegin(), 87 diag::err_param_default_argument_references_param) 88 << Param->getDeclName() << DefaultArg->getSourceRange(); 89 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 90 // C++ [dcl.fct.default]p7 91 // Local variables shall not be used in default argument 92 // expressions. 93 if (VDecl->isBlockVarDecl()) 94 return S->Diag(DRE->getSourceRange().getBegin(), 95 diag::err_param_default_argument_references_local) 96 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 97 } 98 99 return false; 100 } 101 102 /// VisitCXXThisExpr - Visit a C++ "this" expression. 103 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 104 // C++ [dcl.fct.default]p8: 105 // The keyword this shall not be used in a default argument of a 106 // member function. 107 return S->Diag(ThisE->getSourceRange().getBegin(), 108 diag::err_param_default_argument_references_this) 109 << ThisE->getSourceRange(); 110 } 111} 112 113bool 114Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 115 SourceLocation EqualLoc) { 116 if (RequireCompleteType(Param->getLocation(), Param->getType(), 117 diag::err_typecheck_decl_incomplete_type)) { 118 Param->setInvalidDecl(); 119 return true; 120 } 121 122 // C++ [dcl.fct.default]p5 123 // A default argument expression is implicitly converted (clause 124 // 4) to the parameter type. The default argument expression has 125 // the same semantic constraints as the initializer expression in 126 // a declaration of a variable of the parameter type, using the 127 // copy-initialization semantics (8.5). 128 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 129 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 130 EqualLoc); 131 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 132 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 133 MultiExprArg(*this, &Arg, 1)); 134 if (Result.isInvalid()) 135 return true; 136 Arg = Result.takeAs<Expr>(); 137 138 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 139 140 // Okay: add the default argument to the parameter 141 Param->setDefaultArg(Arg); 142 143 return false; 144} 145 146/// ActOnParamDefaultArgument - Check whether the default argument 147/// provided for a function parameter is well-formed. If so, attach it 148/// to the parameter declaration. 149void 150Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 151 Expr *DefaultArg) { 152 if (!param || !DefaultArg) 153 return; 154 155 ParmVarDecl *Param = cast<ParmVarDecl>(param); 156 UnparsedDefaultArgLocs.erase(Param); 157 158 // Default arguments are only permitted in C++ 159 if (!getLangOptions().CPlusPlus) { 160 Diag(EqualLoc, diag::err_param_default_argument) 161 << DefaultArg->getSourceRange(); 162 Param->setInvalidDecl(); 163 return; 164 } 165 166 // Check that the default argument is well-formed 167 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 168 if (DefaultArgChecker.Visit(DefaultArg)) { 169 Param->setInvalidDecl(); 170 return; 171 } 172 173 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 174} 175 176/// ActOnParamUnparsedDefaultArgument - We've seen a default 177/// argument for a function parameter, but we can't parse it yet 178/// because we're inside a class definition. Note that this default 179/// argument will be parsed later. 180void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 181 SourceLocation EqualLoc, 182 SourceLocation ArgLoc) { 183 if (!param) 184 return; 185 186 ParmVarDecl *Param = cast<ParmVarDecl>(param); 187 if (Param) 188 Param->setUnparsedDefaultArg(); 189 190 UnparsedDefaultArgLocs[Param] = ArgLoc; 191} 192 193/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 194/// the default argument for the parameter param failed. 195void Sema::ActOnParamDefaultArgumentError(Decl *param) { 196 if (!param) 197 return; 198 199 ParmVarDecl *Param = cast<ParmVarDecl>(param); 200 201 Param->setInvalidDecl(); 202 203 UnparsedDefaultArgLocs.erase(Param); 204} 205 206/// CheckExtraCXXDefaultArguments - Check for any extra default 207/// arguments in the declarator, which is not a function declaration 208/// or definition and therefore is not permitted to have default 209/// arguments. This routine should be invoked for every declarator 210/// that is not a function declaration or definition. 211void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 212 // C++ [dcl.fct.default]p3 213 // A default argument expression shall be specified only in the 214 // parameter-declaration-clause of a function declaration or in a 215 // template-parameter (14.1). It shall not be specified for a 216 // parameter pack. If it is specified in a 217 // parameter-declaration-clause, it shall not occur within a 218 // declarator or abstract-declarator of a parameter-declaration. 219 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 220 DeclaratorChunk &chunk = D.getTypeObject(i); 221 if (chunk.Kind == DeclaratorChunk::Function) { 222 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 223 ParmVarDecl *Param = 224 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 225 if (Param->hasUnparsedDefaultArg()) { 226 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 227 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 228 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 229 delete Toks; 230 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 231 } else if (Param->getDefaultArg()) { 232 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 233 << Param->getDefaultArg()->getSourceRange(); 234 Param->setDefaultArg(0); 235 } 236 } 237 } 238 } 239} 240 241// MergeCXXFunctionDecl - Merge two declarations of the same C++ 242// function, once we already know that they have the same 243// type. Subroutine of MergeFunctionDecl. Returns true if there was an 244// error, false otherwise. 245bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 246 bool Invalid = false; 247 248 // C++ [dcl.fct.default]p4: 249 // For non-template functions, default arguments can be added in 250 // later declarations of a function in the same 251 // scope. Declarations in different scopes have completely 252 // distinct sets of default arguments. That is, declarations in 253 // inner scopes do not acquire default arguments from 254 // declarations in outer scopes, and vice versa. In a given 255 // function declaration, all parameters subsequent to a 256 // parameter with a default argument shall have default 257 // arguments supplied in this or previous declarations. A 258 // default argument shall not be redefined by a later 259 // declaration (not even to the same value). 260 // 261 // C++ [dcl.fct.default]p6: 262 // Except for member functions of class templates, the default arguments 263 // in a member function definition that appears outside of the class 264 // definition are added to the set of default arguments provided by the 265 // member function declaration in the class definition. 266 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 267 ParmVarDecl *OldParam = Old->getParamDecl(p); 268 ParmVarDecl *NewParam = New->getParamDecl(p); 269 270 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 271 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 272 // hint here. Alternatively, we could walk the type-source information 273 // for NewParam to find the last source location in the type... but it 274 // isn't worth the effort right now. This is the kind of test case that 275 // is hard to get right: 276 277 // int f(int); 278 // void g(int (*fp)(int) = f); 279 // void g(int (*fp)(int) = &f); 280 Diag(NewParam->getLocation(), 281 diag::err_param_default_argument_redefinition) 282 << NewParam->getDefaultArgRange(); 283 284 // Look for the function declaration where the default argument was 285 // actually written, which may be a declaration prior to Old. 286 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 287 Older; Older = Older->getPreviousDeclaration()) { 288 if (!Older->getParamDecl(p)->hasDefaultArg()) 289 break; 290 291 OldParam = Older->getParamDecl(p); 292 } 293 294 Diag(OldParam->getLocation(), diag::note_previous_definition) 295 << OldParam->getDefaultArgRange(); 296 Invalid = true; 297 } else if (OldParam->hasDefaultArg()) { 298 // Merge the old default argument into the new parameter. 299 // It's important to use getInit() here; getDefaultArg() 300 // strips off any top-level CXXExprWithTemporaries. 301 NewParam->setHasInheritedDefaultArg(); 302 if (OldParam->hasUninstantiatedDefaultArg()) 303 NewParam->setUninstantiatedDefaultArg( 304 OldParam->getUninstantiatedDefaultArg()); 305 else 306 NewParam->setDefaultArg(OldParam->getInit()); 307 } else if (NewParam->hasDefaultArg()) { 308 if (New->getDescribedFunctionTemplate()) { 309 // Paragraph 4, quoted above, only applies to non-template functions. 310 Diag(NewParam->getLocation(), 311 diag::err_param_default_argument_template_redecl) 312 << NewParam->getDefaultArgRange(); 313 Diag(Old->getLocation(), diag::note_template_prev_declaration) 314 << false; 315 } else if (New->getTemplateSpecializationKind() 316 != TSK_ImplicitInstantiation && 317 New->getTemplateSpecializationKind() != TSK_Undeclared) { 318 // C++ [temp.expr.spec]p21: 319 // Default function arguments shall not be specified in a declaration 320 // or a definition for one of the following explicit specializations: 321 // - the explicit specialization of a function template; 322 // - the explicit specialization of a member function template; 323 // - the explicit specialization of a member function of a class 324 // template where the class template specialization to which the 325 // member function specialization belongs is implicitly 326 // instantiated. 327 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 328 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 329 << New->getDeclName() 330 << NewParam->getDefaultArgRange(); 331 } else if (New->getDeclContext()->isDependentContext()) { 332 // C++ [dcl.fct.default]p6 (DR217): 333 // Default arguments for a member function of a class template shall 334 // be specified on the initial declaration of the member function 335 // within the class template. 336 // 337 // Reading the tea leaves a bit in DR217 and its reference to DR205 338 // leads me to the conclusion that one cannot add default function 339 // arguments for an out-of-line definition of a member function of a 340 // dependent type. 341 int WhichKind = 2; 342 if (CXXRecordDecl *Record 343 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 344 if (Record->getDescribedClassTemplate()) 345 WhichKind = 0; 346 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 347 WhichKind = 1; 348 else 349 WhichKind = 2; 350 } 351 352 Diag(NewParam->getLocation(), 353 diag::err_param_default_argument_member_template_redecl) 354 << WhichKind 355 << NewParam->getDefaultArgRange(); 356 } 357 } 358 } 359 360 if (CheckEquivalentExceptionSpec(Old, New)) 361 Invalid = true; 362 363 return Invalid; 364} 365 366/// CheckCXXDefaultArguments - Verify that the default arguments for a 367/// function declaration are well-formed according to C++ 368/// [dcl.fct.default]. 369void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 370 unsigned NumParams = FD->getNumParams(); 371 unsigned p; 372 373 // Find first parameter with a default argument 374 for (p = 0; p < NumParams; ++p) { 375 ParmVarDecl *Param = FD->getParamDecl(p); 376 if (Param->hasDefaultArg()) 377 break; 378 } 379 380 // C++ [dcl.fct.default]p4: 381 // In a given function declaration, all parameters 382 // subsequent to a parameter with a default argument shall 383 // have default arguments supplied in this or previous 384 // declarations. A default argument shall not be redefined 385 // by a later declaration (not even to the same value). 386 unsigned LastMissingDefaultArg = 0; 387 for (; p < NumParams; ++p) { 388 ParmVarDecl *Param = FD->getParamDecl(p); 389 if (!Param->hasDefaultArg()) { 390 if (Param->isInvalidDecl()) 391 /* We already complained about this parameter. */; 392 else if (Param->getIdentifier()) 393 Diag(Param->getLocation(), 394 diag::err_param_default_argument_missing_name) 395 << Param->getIdentifier(); 396 else 397 Diag(Param->getLocation(), 398 diag::err_param_default_argument_missing); 399 400 LastMissingDefaultArg = p; 401 } 402 } 403 404 if (LastMissingDefaultArg > 0) { 405 // Some default arguments were missing. Clear out all of the 406 // default arguments up to (and including) the last missing 407 // default argument, so that we leave the function parameters 408 // in a semantically valid state. 409 for (p = 0; p <= LastMissingDefaultArg; ++p) { 410 ParmVarDecl *Param = FD->getParamDecl(p); 411 if (Param->hasDefaultArg()) { 412 Param->setDefaultArg(0); 413 } 414 } 415 } 416} 417 418/// isCurrentClassName - Determine whether the identifier II is the 419/// name of the class type currently being defined. In the case of 420/// nested classes, this will only return true if II is the name of 421/// the innermost class. 422bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 423 const CXXScopeSpec *SS) { 424 assert(getLangOptions().CPlusPlus && "No class names in C!"); 425 426 CXXRecordDecl *CurDecl; 427 if (SS && SS->isSet() && !SS->isInvalid()) { 428 DeclContext *DC = computeDeclContext(*SS, true); 429 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 430 } else 431 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 432 433 if (CurDecl && CurDecl->getIdentifier()) 434 return &II == CurDecl->getIdentifier(); 435 else 436 return false; 437} 438 439/// \brief Check the validity of a C++ base class specifier. 440/// 441/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 442/// and returns NULL otherwise. 443CXXBaseSpecifier * 444Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 445 SourceRange SpecifierRange, 446 bool Virtual, AccessSpecifier Access, 447 TypeSourceInfo *TInfo) { 448 QualType BaseType = TInfo->getType(); 449 450 // C++ [class.union]p1: 451 // A union shall not have base classes. 452 if (Class->isUnion()) { 453 Diag(Class->getLocation(), diag::err_base_clause_on_union) 454 << SpecifierRange; 455 return 0; 456 } 457 458 if (BaseType->isDependentType()) 459 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 460 Class->getTagKind() == TTK_Class, 461 Access, TInfo); 462 463 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 464 465 // Base specifiers must be record types. 466 if (!BaseType->isRecordType()) { 467 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 468 return 0; 469 } 470 471 // C++ [class.union]p1: 472 // A union shall not be used as a base class. 473 if (BaseType->isUnionType()) { 474 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 475 return 0; 476 } 477 478 // C++ [class.derived]p2: 479 // The class-name in a base-specifier shall not be an incompletely 480 // defined class. 481 if (RequireCompleteType(BaseLoc, BaseType, 482 PDiag(diag::err_incomplete_base_class) 483 << SpecifierRange)) { 484 Class->setInvalidDecl(); 485 return 0; 486 } 487 488 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 489 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 490 assert(BaseDecl && "Record type has no declaration"); 491 BaseDecl = BaseDecl->getDefinition(); 492 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 493 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 494 assert(CXXBaseDecl && "Base type is not a C++ type"); 495 496 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 497 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 498 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 499 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 500 << BaseType; 501 return 0; 502 } 503 504 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 505 506 if (BaseDecl->isInvalidDecl()) 507 Class->setInvalidDecl(); 508 509 // Create the base specifier. 510 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 511 Class->getTagKind() == TTK_Class, 512 Access, TInfo); 513} 514 515void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 516 const CXXRecordDecl *BaseClass, 517 bool BaseIsVirtual) { 518 // A class with a non-empty base class is not empty. 519 // FIXME: Standard ref? 520 if (!BaseClass->isEmpty()) 521 Class->setEmpty(false); 522 523 // C++ [class.virtual]p1: 524 // A class that [...] inherits a virtual function is called a polymorphic 525 // class. 526 if (BaseClass->isPolymorphic()) 527 Class->setPolymorphic(true); 528 529 // C++ [dcl.init.aggr]p1: 530 // An aggregate is [...] a class with [...] no base classes [...]. 531 Class->setAggregate(false); 532 533 // C++ [class]p4: 534 // A POD-struct is an aggregate class... 535 Class->setPOD(false); 536 537 if (BaseIsVirtual) { 538 // C++ [class.ctor]p5: 539 // A constructor is trivial if its class has no virtual base classes. 540 Class->setHasTrivialConstructor(false); 541 542 // C++ [class.copy]p6: 543 // A copy constructor is trivial if its class has no virtual base classes. 544 Class->setHasTrivialCopyConstructor(false); 545 546 // C++ [class.copy]p11: 547 // A copy assignment operator is trivial if its class has no virtual 548 // base classes. 549 Class->setHasTrivialCopyAssignment(false); 550 551 // C++0x [meta.unary.prop] is_empty: 552 // T is a class type, but not a union type, with ... no virtual base 553 // classes 554 Class->setEmpty(false); 555 } else { 556 // C++ [class.ctor]p5: 557 // A constructor is trivial if all the direct base classes of its 558 // class have trivial constructors. 559 if (!BaseClass->hasTrivialConstructor()) 560 Class->setHasTrivialConstructor(false); 561 562 // C++ [class.copy]p6: 563 // A copy constructor is trivial if all the direct base classes of its 564 // class have trivial copy constructors. 565 if (!BaseClass->hasTrivialCopyConstructor()) 566 Class->setHasTrivialCopyConstructor(false); 567 568 // C++ [class.copy]p11: 569 // A copy assignment operator is trivial if all the direct base classes 570 // of its class have trivial copy assignment operators. 571 if (!BaseClass->hasTrivialCopyAssignment()) 572 Class->setHasTrivialCopyAssignment(false); 573 } 574 575 // C++ [class.ctor]p3: 576 // A destructor is trivial if all the direct base classes of its class 577 // have trivial destructors. 578 if (!BaseClass->hasTrivialDestructor()) 579 Class->setHasTrivialDestructor(false); 580} 581 582/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 583/// one entry in the base class list of a class specifier, for 584/// example: 585/// class foo : public bar, virtual private baz { 586/// 'public bar' and 'virtual private baz' are each base-specifiers. 587BaseResult 588Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 589 bool Virtual, AccessSpecifier Access, 590 ParsedType basetype, SourceLocation BaseLoc) { 591 if (!classdecl) 592 return true; 593 594 AdjustDeclIfTemplate(classdecl); 595 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 596 if (!Class) 597 return true; 598 599 TypeSourceInfo *TInfo = 0; 600 GetTypeFromParser(basetype, &TInfo); 601 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 602 Virtual, Access, TInfo)) 603 return BaseSpec; 604 605 return true; 606} 607 608/// \brief Performs the actual work of attaching the given base class 609/// specifiers to a C++ class. 610bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 611 unsigned NumBases) { 612 if (NumBases == 0) 613 return false; 614 615 // Used to keep track of which base types we have already seen, so 616 // that we can properly diagnose redundant direct base types. Note 617 // that the key is always the unqualified canonical type of the base 618 // class. 619 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 620 621 // Copy non-redundant base specifiers into permanent storage. 622 unsigned NumGoodBases = 0; 623 bool Invalid = false; 624 for (unsigned idx = 0; idx < NumBases; ++idx) { 625 QualType NewBaseType 626 = Context.getCanonicalType(Bases[idx]->getType()); 627 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 628 if (!Class->hasObjectMember()) { 629 if (const RecordType *FDTTy = 630 NewBaseType.getTypePtr()->getAs<RecordType>()) 631 if (FDTTy->getDecl()->hasObjectMember()) 632 Class->setHasObjectMember(true); 633 } 634 635 if (KnownBaseTypes[NewBaseType]) { 636 // C++ [class.mi]p3: 637 // A class shall not be specified as a direct base class of a 638 // derived class more than once. 639 Diag(Bases[idx]->getSourceRange().getBegin(), 640 diag::err_duplicate_base_class) 641 << KnownBaseTypes[NewBaseType]->getType() 642 << Bases[idx]->getSourceRange(); 643 644 // Delete the duplicate base class specifier; we're going to 645 // overwrite its pointer later. 646 Context.Deallocate(Bases[idx]); 647 648 Invalid = true; 649 } else { 650 // Okay, add this new base class. 651 KnownBaseTypes[NewBaseType] = Bases[idx]; 652 Bases[NumGoodBases++] = Bases[idx]; 653 } 654 } 655 656 // Attach the remaining base class specifiers to the derived class. 657 Class->setBases(Bases, NumGoodBases); 658 659 // Delete the remaining (good) base class specifiers, since their 660 // data has been copied into the CXXRecordDecl. 661 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 662 Context.Deallocate(Bases[idx]); 663 664 return Invalid; 665} 666 667/// ActOnBaseSpecifiers - Attach the given base specifiers to the 668/// class, after checking whether there are any duplicate base 669/// classes. 670void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 671 unsigned NumBases) { 672 if (!ClassDecl || !Bases || !NumBases) 673 return; 674 675 AdjustDeclIfTemplate(ClassDecl); 676 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 677 (CXXBaseSpecifier**)(Bases), NumBases); 678} 679 680static CXXRecordDecl *GetClassForType(QualType T) { 681 if (const RecordType *RT = T->getAs<RecordType>()) 682 return cast<CXXRecordDecl>(RT->getDecl()); 683 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 684 return ICT->getDecl(); 685 else 686 return 0; 687} 688 689/// \brief Determine whether the type \p Derived is a C++ class that is 690/// derived from the type \p Base. 691bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 692 if (!getLangOptions().CPlusPlus) 693 return false; 694 695 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 696 if (!DerivedRD) 697 return false; 698 699 CXXRecordDecl *BaseRD = GetClassForType(Base); 700 if (!BaseRD) 701 return false; 702 703 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 704 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 705} 706 707/// \brief Determine whether the type \p Derived is a C++ class that is 708/// derived from the type \p Base. 709bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 710 if (!getLangOptions().CPlusPlus) 711 return false; 712 713 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 714 if (!DerivedRD) 715 return false; 716 717 CXXRecordDecl *BaseRD = GetClassForType(Base); 718 if (!BaseRD) 719 return false; 720 721 return DerivedRD->isDerivedFrom(BaseRD, Paths); 722} 723 724void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 725 CXXCastPath &BasePathArray) { 726 assert(BasePathArray.empty() && "Base path array must be empty!"); 727 assert(Paths.isRecordingPaths() && "Must record paths!"); 728 729 const CXXBasePath &Path = Paths.front(); 730 731 // We first go backward and check if we have a virtual base. 732 // FIXME: It would be better if CXXBasePath had the base specifier for 733 // the nearest virtual base. 734 unsigned Start = 0; 735 for (unsigned I = Path.size(); I != 0; --I) { 736 if (Path[I - 1].Base->isVirtual()) { 737 Start = I - 1; 738 break; 739 } 740 } 741 742 // Now add all bases. 743 for (unsigned I = Start, E = Path.size(); I != E; ++I) 744 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 745} 746 747/// \brief Determine whether the given base path includes a virtual 748/// base class. 749bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 750 for (CXXCastPath::const_iterator B = BasePath.begin(), 751 BEnd = BasePath.end(); 752 B != BEnd; ++B) 753 if ((*B)->isVirtual()) 754 return true; 755 756 return false; 757} 758 759/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 760/// conversion (where Derived and Base are class types) is 761/// well-formed, meaning that the conversion is unambiguous (and 762/// that all of the base classes are accessible). Returns true 763/// and emits a diagnostic if the code is ill-formed, returns false 764/// otherwise. Loc is the location where this routine should point to 765/// if there is an error, and Range is the source range to highlight 766/// if there is an error. 767bool 768Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 769 unsigned InaccessibleBaseID, 770 unsigned AmbigiousBaseConvID, 771 SourceLocation Loc, SourceRange Range, 772 DeclarationName Name, 773 CXXCastPath *BasePath) { 774 // First, determine whether the path from Derived to Base is 775 // ambiguous. This is slightly more expensive than checking whether 776 // the Derived to Base conversion exists, because here we need to 777 // explore multiple paths to determine if there is an ambiguity. 778 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 779 /*DetectVirtual=*/false); 780 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 781 assert(DerivationOkay && 782 "Can only be used with a derived-to-base conversion"); 783 (void)DerivationOkay; 784 785 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 786 if (InaccessibleBaseID) { 787 // Check that the base class can be accessed. 788 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 789 InaccessibleBaseID)) { 790 case AR_inaccessible: 791 return true; 792 case AR_accessible: 793 case AR_dependent: 794 case AR_delayed: 795 break; 796 } 797 } 798 799 // Build a base path if necessary. 800 if (BasePath) 801 BuildBasePathArray(Paths, *BasePath); 802 return false; 803 } 804 805 // We know that the derived-to-base conversion is ambiguous, and 806 // we're going to produce a diagnostic. Perform the derived-to-base 807 // search just one more time to compute all of the possible paths so 808 // that we can print them out. This is more expensive than any of 809 // the previous derived-to-base checks we've done, but at this point 810 // performance isn't as much of an issue. 811 Paths.clear(); 812 Paths.setRecordingPaths(true); 813 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 814 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 815 (void)StillOkay; 816 817 // Build up a textual representation of the ambiguous paths, e.g., 818 // D -> B -> A, that will be used to illustrate the ambiguous 819 // conversions in the diagnostic. We only print one of the paths 820 // to each base class subobject. 821 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 822 823 Diag(Loc, AmbigiousBaseConvID) 824 << Derived << Base << PathDisplayStr << Range << Name; 825 return true; 826} 827 828bool 829Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 830 SourceLocation Loc, SourceRange Range, 831 CXXCastPath *BasePath, 832 bool IgnoreAccess) { 833 return CheckDerivedToBaseConversion(Derived, Base, 834 IgnoreAccess ? 0 835 : diag::err_upcast_to_inaccessible_base, 836 diag::err_ambiguous_derived_to_base_conv, 837 Loc, Range, DeclarationName(), 838 BasePath); 839} 840 841 842/// @brief Builds a string representing ambiguous paths from a 843/// specific derived class to different subobjects of the same base 844/// class. 845/// 846/// This function builds a string that can be used in error messages 847/// to show the different paths that one can take through the 848/// inheritance hierarchy to go from the derived class to different 849/// subobjects of a base class. The result looks something like this: 850/// @code 851/// struct D -> struct B -> struct A 852/// struct D -> struct C -> struct A 853/// @endcode 854std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 855 std::string PathDisplayStr; 856 std::set<unsigned> DisplayedPaths; 857 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 858 Path != Paths.end(); ++Path) { 859 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 860 // We haven't displayed a path to this particular base 861 // class subobject yet. 862 PathDisplayStr += "\n "; 863 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 864 for (CXXBasePath::const_iterator Element = Path->begin(); 865 Element != Path->end(); ++Element) 866 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 867 } 868 } 869 870 return PathDisplayStr; 871} 872 873//===----------------------------------------------------------------------===// 874// C++ class member Handling 875//===----------------------------------------------------------------------===// 876 877/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 878Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 879 SourceLocation ASLoc, 880 SourceLocation ColonLoc) { 881 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 882 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 883 ASLoc, ColonLoc); 884 CurContext->addHiddenDecl(ASDecl); 885 return ASDecl; 886} 887 888/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 889/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 890/// bitfield width if there is one and 'InitExpr' specifies the initializer if 891/// any. 892Decl * 893Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 894 MultiTemplateParamsArg TemplateParameterLists, 895 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 896 bool Deleted) { 897 const DeclSpec &DS = D.getDeclSpec(); 898 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 899 DeclarationName Name = NameInfo.getName(); 900 SourceLocation Loc = NameInfo.getLoc(); 901 Expr *BitWidth = static_cast<Expr*>(BW); 902 Expr *Init = static_cast<Expr*>(InitExpr); 903 904 assert(isa<CXXRecordDecl>(CurContext)); 905 assert(!DS.isFriendSpecified()); 906 907 bool isFunc = false; 908 if (D.isFunctionDeclarator()) 909 isFunc = true; 910 else if (D.getNumTypeObjects() == 0 && 911 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 912 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 913 isFunc = TDType->isFunctionType(); 914 } 915 916 // C++ 9.2p6: A member shall not be declared to have automatic storage 917 // duration (auto, register) or with the extern storage-class-specifier. 918 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 919 // data members and cannot be applied to names declared const or static, 920 // and cannot be applied to reference members. 921 switch (DS.getStorageClassSpec()) { 922 case DeclSpec::SCS_unspecified: 923 case DeclSpec::SCS_typedef: 924 case DeclSpec::SCS_static: 925 // FALL THROUGH. 926 break; 927 case DeclSpec::SCS_mutable: 928 if (isFunc) { 929 if (DS.getStorageClassSpecLoc().isValid()) 930 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 931 else 932 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 933 934 // FIXME: It would be nicer if the keyword was ignored only for this 935 // declarator. Otherwise we could get follow-up errors. 936 D.getMutableDeclSpec().ClearStorageClassSpecs(); 937 } 938 break; 939 default: 940 if (DS.getStorageClassSpecLoc().isValid()) 941 Diag(DS.getStorageClassSpecLoc(), 942 diag::err_storageclass_invalid_for_member); 943 else 944 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 945 D.getMutableDeclSpec().ClearStorageClassSpecs(); 946 } 947 948 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 949 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 950 !isFunc); 951 952 Decl *Member; 953 if (isInstField) { 954 // FIXME: Check for template parameters! 955 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 956 AS); 957 assert(Member && "HandleField never returns null"); 958 } else { 959 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 960 if (!Member) { 961 return 0; 962 } 963 964 // Non-instance-fields can't have a bitfield. 965 if (BitWidth) { 966 if (Member->isInvalidDecl()) { 967 // don't emit another diagnostic. 968 } else if (isa<VarDecl>(Member)) { 969 // C++ 9.6p3: A bit-field shall not be a static member. 970 // "static member 'A' cannot be a bit-field" 971 Diag(Loc, diag::err_static_not_bitfield) 972 << Name << BitWidth->getSourceRange(); 973 } else if (isa<TypedefDecl>(Member)) { 974 // "typedef member 'x' cannot be a bit-field" 975 Diag(Loc, diag::err_typedef_not_bitfield) 976 << Name << BitWidth->getSourceRange(); 977 } else { 978 // A function typedef ("typedef int f(); f a;"). 979 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 980 Diag(Loc, diag::err_not_integral_type_bitfield) 981 << Name << cast<ValueDecl>(Member)->getType() 982 << BitWidth->getSourceRange(); 983 } 984 985 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(Member, Init, false); 1001 if (Deleted) // FIXME: Source location is not very good. 1002 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 1003 1004 if (isInstField) { 1005 FieldCollector->Add(cast<FieldDecl>(Member)); 1006 return 0; 1007 } 1008 return 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. 1057MemInitResult 1058Sema::ActOnMemInitializer(Decl *ConstructorD, 1059 Scope *S, 1060 CXXScopeSpec &SS, 1061 IdentifierInfo *MemberOrBase, 1062 ParsedType 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); 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()->getRedeclContext()->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 1263MemInitResult 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 Expr *Init 1293 = 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, 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 ExprResult MemberInit = 1322 InitSeq.Perform(*this, MemberEntity, Kind, 1323 MultiExprArg(*this, 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(MemberInit.get()); 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 Expr *Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1347 RParenLoc); 1348 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1349 LParenLoc, 1350 Init, 1351 RParenLoc); 1352 } 1353 1354 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1355 LParenLoc, 1356 MemberInit.get(), 1357 RParenLoc); 1358} 1359 1360MemInitResult 1361Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1362 Expr **Args, unsigned NumArgs, 1363 SourceLocation LParenLoc, SourceLocation RParenLoc, 1364 CXXRecordDecl *ClassDecl) { 1365 bool HasDependentArg = false; 1366 for (unsigned i = 0; i < NumArgs; i++) 1367 HasDependentArg |= Args[i]->isTypeDependent(); 1368 1369 SourceLocation BaseLoc 1370 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1371 1372 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1373 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1374 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1375 1376 // C++ [class.base.init]p2: 1377 // [...] Unless the mem-initializer-id names a nonstatic data 1378 // member of the constructor���s class or a direct or virtual base 1379 // of that class, the mem-initializer is ill-formed. A 1380 // mem-initializer-list can initialize a base class using any 1381 // name that denotes that base class type. 1382 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1383 1384 // Check for direct and virtual base classes. 1385 const CXXBaseSpecifier *DirectBaseSpec = 0; 1386 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1387 if (!Dependent) { 1388 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1389 VirtualBaseSpec); 1390 1391 // C++ [base.class.init]p2: 1392 // Unless the mem-initializer-id names a nonstatic data member of the 1393 // constructor's class or a direct or virtual base of that class, the 1394 // mem-initializer is ill-formed. 1395 if (!DirectBaseSpec && !VirtualBaseSpec) { 1396 // If the class has any dependent bases, then it's possible that 1397 // one of those types will resolve to the same type as 1398 // BaseType. Therefore, just treat this as a dependent base 1399 // class initialization. FIXME: Should we try to check the 1400 // initialization anyway? It seems odd. 1401 if (ClassDecl->hasAnyDependentBases()) 1402 Dependent = true; 1403 else 1404 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1405 << BaseType << Context.getTypeDeclType(ClassDecl) 1406 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1407 } 1408 } 1409 1410 if (Dependent) { 1411 // Can't check initialization for a base of dependent type or when 1412 // any of the arguments are type-dependent expressions. 1413 ExprResult BaseInit 1414 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1415 RParenLoc)); 1416 1417 // Erase any temporaries within this evaluation context; we're not 1418 // going to track them in the AST, since we'll be rebuilding the 1419 // ASTs during template instantiation. 1420 ExprTemporaries.erase( 1421 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1422 ExprTemporaries.end()); 1423 1424 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1425 /*IsVirtual=*/false, 1426 LParenLoc, 1427 BaseInit.takeAs<Expr>(), 1428 RParenLoc); 1429 } 1430 1431 // C++ [base.class.init]p2: 1432 // If a mem-initializer-id is ambiguous because it designates both 1433 // a direct non-virtual base class and an inherited virtual base 1434 // class, the mem-initializer is ill-formed. 1435 if (DirectBaseSpec && VirtualBaseSpec) 1436 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1437 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1438 1439 CXXBaseSpecifier *BaseSpec 1440 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1441 if (!BaseSpec) 1442 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1443 1444 // Initialize the base. 1445 InitializedEntity BaseEntity = 1446 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1447 InitializationKind Kind = 1448 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1449 1450 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1451 1452 ExprResult BaseInit = 1453 InitSeq.Perform(*this, BaseEntity, Kind, 1454 MultiExprArg(*this, Args, NumArgs), 0); 1455 if (BaseInit.isInvalid()) 1456 return true; 1457 1458 // C++0x [class.base.init]p7: 1459 // The initialization of each base and member constitutes a 1460 // full-expression. 1461 BaseInit = MaybeCreateCXXExprWithTemporaries(BaseInit.get()); 1462 if (BaseInit.isInvalid()) 1463 return true; 1464 1465 // If we are in a dependent context, template instantiation will 1466 // perform this type-checking again. Just save the arguments that we 1467 // received in a ParenListExpr. 1468 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1469 // of the information that we have about the base 1470 // initializer. However, deconstructing the ASTs is a dicey process, 1471 // and this approach is far more likely to get the corner cases right. 1472 if (CurContext->isDependentContext()) { 1473 // Bump the reference count of all of the arguments. 1474 for (unsigned I = 0; I != NumArgs; ++I) 1475 Args[I]->Retain(); 1476 1477 ExprResult Init 1478 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1479 RParenLoc)); 1480 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1481 BaseSpec->isVirtual(), 1482 LParenLoc, 1483 Init.takeAs<Expr>(), 1484 RParenLoc); 1485 } 1486 1487 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1488 BaseSpec->isVirtual(), 1489 LParenLoc, 1490 BaseInit.takeAs<Expr>(), 1491 RParenLoc); 1492} 1493 1494/// ImplicitInitializerKind - How an implicit base or member initializer should 1495/// initialize its base or member. 1496enum ImplicitInitializerKind { 1497 IIK_Default, 1498 IIK_Copy, 1499 IIK_Move 1500}; 1501 1502static bool 1503BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1504 ImplicitInitializerKind ImplicitInitKind, 1505 CXXBaseSpecifier *BaseSpec, 1506 bool IsInheritedVirtualBase, 1507 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1508 InitializedEntity InitEntity 1509 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1510 IsInheritedVirtualBase); 1511 1512 ExprResult BaseInit; 1513 1514 switch (ImplicitInitKind) { 1515 case IIK_Default: { 1516 InitializationKind InitKind 1517 = InitializationKind::CreateDefault(Constructor->getLocation()); 1518 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1519 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1520 MultiExprArg(SemaRef, 0, 0)); 1521 break; 1522 } 1523 1524 case IIK_Copy: { 1525 ParmVarDecl *Param = Constructor->getParamDecl(0); 1526 QualType ParamType = Param->getType().getNonReferenceType(); 1527 1528 Expr *CopyCtorArg = 1529 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1530 Constructor->getLocation(), ParamType, 0); 1531 1532 // Cast to the base class to avoid ambiguities. 1533 QualType ArgTy = 1534 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1535 ParamType.getQualifiers()); 1536 1537 CXXCastPath BasePath; 1538 BasePath.push_back(BaseSpec); 1539 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1540 CK_UncheckedDerivedToBase, 1541 VK_LValue, &BasePath); 1542 1543 InitializationKind InitKind 1544 = InitializationKind::CreateDirect(Constructor->getLocation(), 1545 SourceLocation(), SourceLocation()); 1546 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1547 &CopyCtorArg, 1); 1548 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1549 MultiExprArg(&CopyCtorArg, 1)); 1550 break; 1551 } 1552 1553 case IIK_Move: 1554 assert(false && "Unhandled initializer kind!"); 1555 } 1556 1557 if (BaseInit.isInvalid()) 1558 return true; 1559 1560 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(BaseInit.get()); 1561 if (BaseInit.isInvalid()) 1562 return true; 1563 1564 CXXBaseInit = 1565 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1566 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1567 SourceLocation()), 1568 BaseSpec->isVirtual(), 1569 SourceLocation(), 1570 BaseInit.takeAs<Expr>(), 1571 SourceLocation()); 1572 1573 return false; 1574} 1575 1576static bool 1577BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1578 ImplicitInitializerKind ImplicitInitKind, 1579 FieldDecl *Field, 1580 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1581 if (Field->isInvalidDecl()) 1582 return true; 1583 1584 SourceLocation Loc = Constructor->getLocation(); 1585 1586 if (ImplicitInitKind == IIK_Copy) { 1587 ParmVarDecl *Param = Constructor->getParamDecl(0); 1588 QualType ParamType = Param->getType().getNonReferenceType(); 1589 1590 Expr *MemberExprBase = 1591 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1592 Loc, ParamType, 0); 1593 1594 // Build a reference to this field within the parameter. 1595 CXXScopeSpec SS; 1596 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1597 Sema::LookupMemberName); 1598 MemberLookup.addDecl(Field, AS_public); 1599 MemberLookup.resolveKind(); 1600 ExprResult CopyCtorArg 1601 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1602 ParamType, Loc, 1603 /*IsArrow=*/false, 1604 SS, 1605 /*FirstQualifierInScope=*/0, 1606 MemberLookup, 1607 /*TemplateArgs=*/0); 1608 if (CopyCtorArg.isInvalid()) 1609 return true; 1610 1611 // When the field we are copying is an array, create index variables for 1612 // each dimension of the array. We use these index variables to subscript 1613 // the source array, and other clients (e.g., CodeGen) will perform the 1614 // necessary iteration with these index variables. 1615 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1616 QualType BaseType = Field->getType(); 1617 QualType SizeType = SemaRef.Context.getSizeType(); 1618 while (const ConstantArrayType *Array 1619 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1620 // Create the iteration variable for this array index. 1621 IdentifierInfo *IterationVarName = 0; 1622 { 1623 llvm::SmallString<8> Str; 1624 llvm::raw_svector_ostream OS(Str); 1625 OS << "__i" << IndexVariables.size(); 1626 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1627 } 1628 VarDecl *IterationVar 1629 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1630 IterationVarName, SizeType, 1631 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1632 SC_None, SC_None); 1633 IndexVariables.push_back(IterationVar); 1634 1635 // Create a reference to the iteration variable. 1636 ExprResult IterationVarRef 1637 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1638 assert(!IterationVarRef.isInvalid() && 1639 "Reference to invented variable cannot fail!"); 1640 1641 // Subscript the array with this iteration variable. 1642 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1643 Loc, 1644 IterationVarRef.take(), 1645 Loc); 1646 if (CopyCtorArg.isInvalid()) 1647 return true; 1648 1649 BaseType = Array->getElementType(); 1650 } 1651 1652 // Construct the entity that we will be initializing. For an array, this 1653 // will be first element in the array, which may require several levels 1654 // of array-subscript entities. 1655 llvm::SmallVector<InitializedEntity, 4> Entities; 1656 Entities.reserve(1 + IndexVariables.size()); 1657 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1658 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1659 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1660 0, 1661 Entities.back())); 1662 1663 // Direct-initialize to use the copy constructor. 1664 InitializationKind InitKind = 1665 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1666 1667 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1668 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1669 &CopyCtorArgE, 1); 1670 1671 ExprResult MemberInit 1672 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1673 MultiExprArg(&CopyCtorArgE, 1)); 1674 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1675 if (MemberInit.isInvalid()) 1676 return true; 1677 1678 CXXMemberInit 1679 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1680 MemberInit.takeAs<Expr>(), Loc, 1681 IndexVariables.data(), 1682 IndexVariables.size()); 1683 return false; 1684 } 1685 1686 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1687 1688 QualType FieldBaseElementType = 1689 SemaRef.Context.getBaseElementType(Field->getType()); 1690 1691 if (FieldBaseElementType->isRecordType()) { 1692 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1693 InitializationKind InitKind = 1694 InitializationKind::CreateDefault(Loc); 1695 1696 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1697 ExprResult MemberInit = 1698 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1699 if (MemberInit.isInvalid()) 1700 return true; 1701 1702 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1703 if (MemberInit.isInvalid()) 1704 return true; 1705 1706 CXXMemberInit = 1707 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1708 Field, Loc, Loc, 1709 MemberInit.get(), 1710 Loc); 1711 return false; 1712 } 1713 1714 if (FieldBaseElementType->isReferenceType()) { 1715 SemaRef.Diag(Constructor->getLocation(), 1716 diag::err_uninitialized_member_in_ctor) 1717 << (int)Constructor->isImplicit() 1718 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1719 << 0 << Field->getDeclName(); 1720 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1721 return true; 1722 } 1723 1724 if (FieldBaseElementType.isConstQualified()) { 1725 SemaRef.Diag(Constructor->getLocation(), 1726 diag::err_uninitialized_member_in_ctor) 1727 << (int)Constructor->isImplicit() 1728 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1729 << 1 << Field->getDeclName(); 1730 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1731 return true; 1732 } 1733 1734 // Nothing to initialize. 1735 CXXMemberInit = 0; 1736 return false; 1737} 1738 1739namespace { 1740struct BaseAndFieldInfo { 1741 Sema &S; 1742 CXXConstructorDecl *Ctor; 1743 bool AnyErrorsInInits; 1744 ImplicitInitializerKind IIK; 1745 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1746 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1747 1748 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1749 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1750 // FIXME: Handle implicit move constructors. 1751 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1752 IIK = IIK_Copy; 1753 else 1754 IIK = IIK_Default; 1755 } 1756}; 1757} 1758 1759static void RecordFieldInitializer(BaseAndFieldInfo &Info, 1760 FieldDecl *Top, FieldDecl *Field, 1761 CXXBaseOrMemberInitializer *Init) { 1762 // If the member doesn't need to be initialized, Init will still be null. 1763 if (!Init) 1764 return; 1765 1766 Info.AllToInit.push_back(Init); 1767 if (Field != Top) { 1768 Init->setMember(Top); 1769 Init->setAnonUnionMember(Field); 1770 } 1771} 1772 1773static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1774 FieldDecl *Top, FieldDecl *Field) { 1775 1776 // Overwhelmingly common case: we have a direct initializer for this field. 1777 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1778 RecordFieldInitializer(Info, Top, Field, Init); 1779 return false; 1780 } 1781 1782 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1783 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1784 assert(FieldClassType && "anonymous struct/union without record type"); 1785 CXXRecordDecl *FieldClassDecl 1786 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1787 1788 // Even though union members never have non-trivial default 1789 // constructions in C++03, we still build member initializers for aggregate 1790 // record types which can be union members, and C++0x allows non-trivial 1791 // default constructors for union members, so we ensure that only one 1792 // member is initialized for these. 1793 if (FieldClassDecl->isUnion()) { 1794 // First check for an explicit initializer for one field. 1795 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1796 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1797 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1798 RecordFieldInitializer(Info, Top, *FA, Init); 1799 1800 // Once we've initialized a field of an anonymous union, the union 1801 // field in the class is also initialized, so exit immediately. 1802 return false; 1803 } else if ((*FA)->isAnonymousStructOrUnion()) { 1804 if (CollectFieldInitializer(Info, Top, *FA)) 1805 return true; 1806 } 1807 } 1808 1809 // Fallthrough and construct a default initializer for the union as 1810 // a whole, which can call its default constructor if such a thing exists 1811 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1812 // behavior going forward with C++0x, when anonymous unions there are 1813 // finalized, we should revisit this. 1814 } else { 1815 // For structs, we simply descend through to initialize all members where 1816 // necessary. 1817 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1818 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1819 if (CollectFieldInitializer(Info, Top, *FA)) 1820 return true; 1821 } 1822 } 1823 } 1824 1825 // Don't try to build an implicit initializer if there were semantic 1826 // errors in any of the initializers (and therefore we might be 1827 // missing some that the user actually wrote). 1828 if (Info.AnyErrorsInInits) 1829 return false; 1830 1831 CXXBaseOrMemberInitializer *Init = 0; 1832 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1833 return true; 1834 1835 RecordFieldInitializer(Info, Top, Field, Init); 1836 return false; 1837} 1838 1839bool 1840Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1841 CXXBaseOrMemberInitializer **Initializers, 1842 unsigned NumInitializers, 1843 bool AnyErrors) { 1844 if (Constructor->getDeclContext()->isDependentContext()) { 1845 // Just store the initializers as written, they will be checked during 1846 // instantiation. 1847 if (NumInitializers > 0) { 1848 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1849 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1850 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1851 memcpy(baseOrMemberInitializers, Initializers, 1852 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1853 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1854 } 1855 1856 return false; 1857 } 1858 1859 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1860 1861 // We need to build the initializer AST according to order of construction 1862 // and not what user specified in the Initializers list. 1863 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1864 if (!ClassDecl) 1865 return true; 1866 1867 bool HadError = false; 1868 1869 for (unsigned i = 0; i < NumInitializers; i++) { 1870 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1871 1872 if (Member->isBaseInitializer()) 1873 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1874 else 1875 Info.AllBaseFields[Member->getMember()] = Member; 1876 } 1877 1878 // Keep track of the direct virtual bases. 1879 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1880 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1881 E = ClassDecl->bases_end(); I != E; ++I) { 1882 if (I->isVirtual()) 1883 DirectVBases.insert(I); 1884 } 1885 1886 // Push virtual bases before others. 1887 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1888 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1889 1890 if (CXXBaseOrMemberInitializer *Value 1891 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1892 Info.AllToInit.push_back(Value); 1893 } else if (!AnyErrors) { 1894 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1895 CXXBaseOrMemberInitializer *CXXBaseInit; 1896 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1897 VBase, IsInheritedVirtualBase, 1898 CXXBaseInit)) { 1899 HadError = true; 1900 continue; 1901 } 1902 1903 Info.AllToInit.push_back(CXXBaseInit); 1904 } 1905 } 1906 1907 // Non-virtual bases. 1908 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1909 E = ClassDecl->bases_end(); Base != E; ++Base) { 1910 // Virtuals are in the virtual base list and already constructed. 1911 if (Base->isVirtual()) 1912 continue; 1913 1914 if (CXXBaseOrMemberInitializer *Value 1915 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1916 Info.AllToInit.push_back(Value); 1917 } else if (!AnyErrors) { 1918 CXXBaseOrMemberInitializer *CXXBaseInit; 1919 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1920 Base, /*IsInheritedVirtualBase=*/false, 1921 CXXBaseInit)) { 1922 HadError = true; 1923 continue; 1924 } 1925 1926 Info.AllToInit.push_back(CXXBaseInit); 1927 } 1928 } 1929 1930 // Fields. 1931 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1932 E = ClassDecl->field_end(); Field != E; ++Field) { 1933 if ((*Field)->getType()->isIncompleteArrayType()) { 1934 assert(ClassDecl->hasFlexibleArrayMember() && 1935 "Incomplete array type is not valid"); 1936 continue; 1937 } 1938 if (CollectFieldInitializer(Info, *Field, *Field)) 1939 HadError = true; 1940 } 1941 1942 NumInitializers = Info.AllToInit.size(); 1943 if (NumInitializers > 0) { 1944 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1945 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1946 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1947 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1948 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1949 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1950 1951 // Constructors implicitly reference the base and member 1952 // destructors. 1953 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1954 Constructor->getParent()); 1955 } 1956 1957 return HadError; 1958} 1959 1960static void *GetKeyForTopLevelField(FieldDecl *Field) { 1961 // For anonymous unions, use the class declaration as the key. 1962 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1963 if (RT->getDecl()->isAnonymousStructOrUnion()) 1964 return static_cast<void *>(RT->getDecl()); 1965 } 1966 return static_cast<void *>(Field); 1967} 1968 1969static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1970 return Context.getCanonicalType(BaseType).getTypePtr(); 1971} 1972 1973static void *GetKeyForMember(ASTContext &Context, 1974 CXXBaseOrMemberInitializer *Member, 1975 bool MemberMaybeAnon = false) { 1976 if (!Member->isMemberInitializer()) 1977 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1978 1979 // For fields injected into the class via declaration of an anonymous union, 1980 // use its anonymous union class declaration as the unique key. 1981 FieldDecl *Field = Member->getMember(); 1982 1983 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1984 // data member of the class. Data member used in the initializer list is 1985 // in AnonUnionMember field. 1986 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1987 Field = Member->getAnonUnionMember(); 1988 1989 // If the field is a member of an anonymous struct or union, our key 1990 // is the anonymous record decl that's a direct child of the class. 1991 RecordDecl *RD = Field->getParent(); 1992 if (RD->isAnonymousStructOrUnion()) { 1993 while (true) { 1994 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1995 if (Parent->isAnonymousStructOrUnion()) 1996 RD = Parent; 1997 else 1998 break; 1999 } 2000 2001 return static_cast<void *>(RD); 2002 } 2003 2004 return static_cast<void *>(Field); 2005} 2006 2007static void 2008DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2009 const CXXConstructorDecl *Constructor, 2010 CXXBaseOrMemberInitializer **Inits, 2011 unsigned NumInits) { 2012 if (Constructor->getDeclContext()->isDependentContext()) 2013 return; 2014 2015 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 2016 == Diagnostic::Ignored) 2017 return; 2018 2019 // Build the list of bases and members in the order that they'll 2020 // actually be initialized. The explicit initializers should be in 2021 // this same order but may be missing things. 2022 llvm::SmallVector<const void*, 32> IdealInitKeys; 2023 2024 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2025 2026 // 1. Virtual bases. 2027 for (CXXRecordDecl::base_class_const_iterator VBase = 2028 ClassDecl->vbases_begin(), 2029 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2030 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2031 2032 // 2. Non-virtual bases. 2033 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2034 E = ClassDecl->bases_end(); Base != E; ++Base) { 2035 if (Base->isVirtual()) 2036 continue; 2037 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2038 } 2039 2040 // 3. Direct fields. 2041 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2042 E = ClassDecl->field_end(); Field != E; ++Field) 2043 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2044 2045 unsigned NumIdealInits = IdealInitKeys.size(); 2046 unsigned IdealIndex = 0; 2047 2048 CXXBaseOrMemberInitializer *PrevInit = 0; 2049 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2050 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2051 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2052 2053 // Scan forward to try to find this initializer in the idealized 2054 // initializers list. 2055 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2056 if (InitKey == IdealInitKeys[IdealIndex]) 2057 break; 2058 2059 // If we didn't find this initializer, it must be because we 2060 // scanned past it on a previous iteration. That can only 2061 // happen if we're out of order; emit a warning. 2062 if (IdealIndex == NumIdealInits && PrevInit) { 2063 Sema::SemaDiagnosticBuilder D = 2064 SemaRef.Diag(PrevInit->getSourceLocation(), 2065 diag::warn_initializer_out_of_order); 2066 2067 if (PrevInit->isMemberInitializer()) 2068 D << 0 << PrevInit->getMember()->getDeclName(); 2069 else 2070 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2071 2072 if (Init->isMemberInitializer()) 2073 D << 0 << Init->getMember()->getDeclName(); 2074 else 2075 D << 1 << Init->getBaseClassInfo()->getType(); 2076 2077 // Move back to the initializer's location in the ideal list. 2078 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2079 if (InitKey == IdealInitKeys[IdealIndex]) 2080 break; 2081 2082 assert(IdealIndex != NumIdealInits && 2083 "initializer not found in initializer list"); 2084 } 2085 2086 PrevInit = Init; 2087 } 2088} 2089 2090namespace { 2091bool CheckRedundantInit(Sema &S, 2092 CXXBaseOrMemberInitializer *Init, 2093 CXXBaseOrMemberInitializer *&PrevInit) { 2094 if (!PrevInit) { 2095 PrevInit = Init; 2096 return false; 2097 } 2098 2099 if (FieldDecl *Field = Init->getMember()) 2100 S.Diag(Init->getSourceLocation(), 2101 diag::err_multiple_mem_initialization) 2102 << Field->getDeclName() 2103 << Init->getSourceRange(); 2104 else { 2105 Type *BaseClass = Init->getBaseClass(); 2106 assert(BaseClass && "neither field nor base"); 2107 S.Diag(Init->getSourceLocation(), 2108 diag::err_multiple_base_initialization) 2109 << QualType(BaseClass, 0) 2110 << Init->getSourceRange(); 2111 } 2112 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2113 << 0 << PrevInit->getSourceRange(); 2114 2115 return true; 2116} 2117 2118typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2119typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2120 2121bool CheckRedundantUnionInit(Sema &S, 2122 CXXBaseOrMemberInitializer *Init, 2123 RedundantUnionMap &Unions) { 2124 FieldDecl *Field = Init->getMember(); 2125 RecordDecl *Parent = Field->getParent(); 2126 if (!Parent->isAnonymousStructOrUnion()) 2127 return false; 2128 2129 NamedDecl *Child = Field; 2130 do { 2131 if (Parent->isUnion()) { 2132 UnionEntry &En = Unions[Parent]; 2133 if (En.first && En.first != Child) { 2134 S.Diag(Init->getSourceLocation(), 2135 diag::err_multiple_mem_union_initialization) 2136 << Field->getDeclName() 2137 << Init->getSourceRange(); 2138 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2139 << 0 << En.second->getSourceRange(); 2140 return true; 2141 } else if (!En.first) { 2142 En.first = Child; 2143 En.second = Init; 2144 } 2145 } 2146 2147 Child = Parent; 2148 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2149 } while (Parent->isAnonymousStructOrUnion()); 2150 2151 return false; 2152} 2153} 2154 2155/// ActOnMemInitializers - Handle the member initializers for a constructor. 2156void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2157 SourceLocation ColonLoc, 2158 MemInitTy **meminits, unsigned NumMemInits, 2159 bool AnyErrors) { 2160 if (!ConstructorDecl) 2161 return; 2162 2163 AdjustDeclIfTemplate(ConstructorDecl); 2164 2165 CXXConstructorDecl *Constructor 2166 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2167 2168 if (!Constructor) { 2169 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2170 return; 2171 } 2172 2173 CXXBaseOrMemberInitializer **MemInits = 2174 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2175 2176 // Mapping for the duplicate initializers check. 2177 // For member initializers, this is keyed with a FieldDecl*. 2178 // For base initializers, this is keyed with a Type*. 2179 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2180 2181 // Mapping for the inconsistent anonymous-union initializers check. 2182 RedundantUnionMap MemberUnions; 2183 2184 bool HadError = false; 2185 for (unsigned i = 0; i < NumMemInits; i++) { 2186 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2187 2188 // Set the source order index. 2189 Init->setSourceOrder(i); 2190 2191 if (Init->isMemberInitializer()) { 2192 FieldDecl *Field = Init->getMember(); 2193 if (CheckRedundantInit(*this, Init, Members[Field]) || 2194 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2195 HadError = true; 2196 } else { 2197 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2198 if (CheckRedundantInit(*this, Init, Members[Key])) 2199 HadError = true; 2200 } 2201 } 2202 2203 if (HadError) 2204 return; 2205 2206 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2207 2208 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2209} 2210 2211void 2212Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2213 CXXRecordDecl *ClassDecl) { 2214 // Ignore dependent contexts. 2215 if (ClassDecl->isDependentContext()) 2216 return; 2217 2218 // FIXME: all the access-control diagnostics are positioned on the 2219 // field/base declaration. That's probably good; that said, the 2220 // user might reasonably want to know why the destructor is being 2221 // emitted, and we currently don't say. 2222 2223 // Non-static data members. 2224 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2225 E = ClassDecl->field_end(); I != E; ++I) { 2226 FieldDecl *Field = *I; 2227 if (Field->isInvalidDecl()) 2228 continue; 2229 QualType FieldType = Context.getBaseElementType(Field->getType()); 2230 2231 const RecordType* RT = FieldType->getAs<RecordType>(); 2232 if (!RT) 2233 continue; 2234 2235 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2236 if (FieldClassDecl->hasTrivialDestructor()) 2237 continue; 2238 2239 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2240 CheckDestructorAccess(Field->getLocation(), Dtor, 2241 PDiag(diag::err_access_dtor_field) 2242 << Field->getDeclName() 2243 << FieldType); 2244 2245 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2246 } 2247 2248 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2249 2250 // Bases. 2251 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2252 E = ClassDecl->bases_end(); Base != E; ++Base) { 2253 // Bases are always records in a well-formed non-dependent class. 2254 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2255 2256 // Remember direct virtual bases. 2257 if (Base->isVirtual()) 2258 DirectVirtualBases.insert(RT); 2259 2260 // Ignore trivial destructors. 2261 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2262 if (BaseClassDecl->hasTrivialDestructor()) 2263 continue; 2264 2265 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2266 2267 // FIXME: caret should be on the start of the class name 2268 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2269 PDiag(diag::err_access_dtor_base) 2270 << Base->getType() 2271 << Base->getSourceRange()); 2272 2273 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2274 } 2275 2276 // Virtual bases. 2277 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2278 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2279 2280 // Bases are always records in a well-formed non-dependent class. 2281 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2282 2283 // Ignore direct virtual bases. 2284 if (DirectVirtualBases.count(RT)) 2285 continue; 2286 2287 // Ignore trivial destructors. 2288 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2289 if (BaseClassDecl->hasTrivialDestructor()) 2290 continue; 2291 2292 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2293 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2294 PDiag(diag::err_access_dtor_vbase) 2295 << VBase->getType()); 2296 2297 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2298 } 2299} 2300 2301void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2302 if (!CDtorDecl) 2303 return; 2304 2305 if (CXXConstructorDecl *Constructor 2306 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2307 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2308} 2309 2310bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2311 unsigned DiagID, AbstractDiagSelID SelID) { 2312 if (SelID == -1) 2313 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2314 else 2315 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2316} 2317 2318bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2319 const PartialDiagnostic &PD) { 2320 if (!getLangOptions().CPlusPlus) 2321 return false; 2322 2323 if (const ArrayType *AT = Context.getAsArrayType(T)) 2324 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2325 2326 if (const PointerType *PT = T->getAs<PointerType>()) { 2327 // Find the innermost pointer type. 2328 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2329 PT = T; 2330 2331 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2332 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2333 } 2334 2335 const RecordType *RT = T->getAs<RecordType>(); 2336 if (!RT) 2337 return false; 2338 2339 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2340 2341 // We can't answer whether something is abstract until it has a 2342 // definition. If it's currently being defined, we'll walk back 2343 // over all the declarations when we have a full definition. 2344 const CXXRecordDecl *Def = RD->getDefinition(); 2345 if (!Def || Def->isBeingDefined()) 2346 return false; 2347 2348 if (!RD->isAbstract()) 2349 return false; 2350 2351 Diag(Loc, PD) << RD->getDeclName(); 2352 DiagnoseAbstractType(RD); 2353 2354 return true; 2355} 2356 2357void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2358 // Check if we've already emitted the list of pure virtual functions 2359 // for this class. 2360 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2361 return; 2362 2363 CXXFinalOverriderMap FinalOverriders; 2364 RD->getFinalOverriders(FinalOverriders); 2365 2366 // Keep a set of seen pure methods so we won't diagnose the same method 2367 // more than once. 2368 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2369 2370 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2371 MEnd = FinalOverriders.end(); 2372 M != MEnd; 2373 ++M) { 2374 for (OverridingMethods::iterator SO = M->second.begin(), 2375 SOEnd = M->second.end(); 2376 SO != SOEnd; ++SO) { 2377 // C++ [class.abstract]p4: 2378 // A class is abstract if it contains or inherits at least one 2379 // pure virtual function for which the final overrider is pure 2380 // virtual. 2381 2382 // 2383 if (SO->second.size() != 1) 2384 continue; 2385 2386 if (!SO->second.front().Method->isPure()) 2387 continue; 2388 2389 if (!SeenPureMethods.insert(SO->second.front().Method)) 2390 continue; 2391 2392 Diag(SO->second.front().Method->getLocation(), 2393 diag::note_pure_virtual_function) 2394 << SO->second.front().Method->getDeclName(); 2395 } 2396 } 2397 2398 if (!PureVirtualClassDiagSet) 2399 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2400 PureVirtualClassDiagSet->insert(RD); 2401} 2402 2403namespace { 2404struct AbstractUsageInfo { 2405 Sema &S; 2406 CXXRecordDecl *Record; 2407 CanQualType AbstractType; 2408 bool Invalid; 2409 2410 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2411 : S(S), Record(Record), 2412 AbstractType(S.Context.getCanonicalType( 2413 S.Context.getTypeDeclType(Record))), 2414 Invalid(false) {} 2415 2416 void DiagnoseAbstractType() { 2417 if (Invalid) return; 2418 S.DiagnoseAbstractType(Record); 2419 Invalid = true; 2420 } 2421 2422 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2423}; 2424 2425struct CheckAbstractUsage { 2426 AbstractUsageInfo &Info; 2427 const NamedDecl *Ctx; 2428 2429 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2430 : Info(Info), Ctx(Ctx) {} 2431 2432 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2433 switch (TL.getTypeLocClass()) { 2434#define ABSTRACT_TYPELOC(CLASS, PARENT) 2435#define TYPELOC(CLASS, PARENT) \ 2436 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2437#include "clang/AST/TypeLocNodes.def" 2438 } 2439 } 2440 2441 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2442 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2443 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2444 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2445 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2446 } 2447 } 2448 2449 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2450 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2451 } 2452 2453 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2454 // Visit the type parameters from a permissive context. 2455 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2456 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2457 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2458 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2459 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2460 // TODO: other template argument types? 2461 } 2462 } 2463 2464 // Visit pointee types from a permissive context. 2465#define CheckPolymorphic(Type) \ 2466 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2467 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2468 } 2469 CheckPolymorphic(PointerTypeLoc) 2470 CheckPolymorphic(ReferenceTypeLoc) 2471 CheckPolymorphic(MemberPointerTypeLoc) 2472 CheckPolymorphic(BlockPointerTypeLoc) 2473 2474 /// Handle all the types we haven't given a more specific 2475 /// implementation for above. 2476 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2477 // Every other kind of type that we haven't called out already 2478 // that has an inner type is either (1) sugar or (2) contains that 2479 // inner type in some way as a subobject. 2480 if (TypeLoc Next = TL.getNextTypeLoc()) 2481 return Visit(Next, Sel); 2482 2483 // If there's no inner type and we're in a permissive context, 2484 // don't diagnose. 2485 if (Sel == Sema::AbstractNone) return; 2486 2487 // Check whether the type matches the abstract type. 2488 QualType T = TL.getType(); 2489 if (T->isArrayType()) { 2490 Sel = Sema::AbstractArrayType; 2491 T = Info.S.Context.getBaseElementType(T); 2492 } 2493 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2494 if (CT != Info.AbstractType) return; 2495 2496 // It matched; do some magic. 2497 if (Sel == Sema::AbstractArrayType) { 2498 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2499 << T << TL.getSourceRange(); 2500 } else { 2501 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2502 << Sel << T << TL.getSourceRange(); 2503 } 2504 Info.DiagnoseAbstractType(); 2505 } 2506}; 2507 2508void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2509 Sema::AbstractDiagSelID Sel) { 2510 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2511} 2512 2513} 2514 2515/// Check for invalid uses of an abstract type in a method declaration. 2516static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2517 CXXMethodDecl *MD) { 2518 // No need to do the check on definitions, which require that 2519 // the return/param types be complete. 2520 if (MD->isThisDeclarationADefinition()) 2521 return; 2522 2523 // For safety's sake, just ignore it if we don't have type source 2524 // information. This should never happen for non-implicit methods, 2525 // but... 2526 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2527 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2528} 2529 2530/// Check for invalid uses of an abstract type within a class definition. 2531static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2532 CXXRecordDecl *RD) { 2533 for (CXXRecordDecl::decl_iterator 2534 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2535 Decl *D = *I; 2536 if (D->isImplicit()) continue; 2537 2538 // Methods and method templates. 2539 if (isa<CXXMethodDecl>(D)) { 2540 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2541 } else if (isa<FunctionTemplateDecl>(D)) { 2542 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2543 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2544 2545 // Fields and static variables. 2546 } else if (isa<FieldDecl>(D)) { 2547 FieldDecl *FD = cast<FieldDecl>(D); 2548 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2549 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2550 } else if (isa<VarDecl>(D)) { 2551 VarDecl *VD = cast<VarDecl>(D); 2552 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2553 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2554 2555 // Nested classes and class templates. 2556 } else if (isa<CXXRecordDecl>(D)) { 2557 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2558 } else if (isa<ClassTemplateDecl>(D)) { 2559 CheckAbstractClassUsage(Info, 2560 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2561 } 2562 } 2563} 2564 2565/// \brief Perform semantic checks on a class definition that has been 2566/// completing, introducing implicitly-declared members, checking for 2567/// abstract types, etc. 2568void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2569 if (!Record || Record->isInvalidDecl()) 2570 return; 2571 2572 if (!Record->isDependentType()) 2573 AddImplicitlyDeclaredMembersToClass(Record); 2574 2575 if (Record->isInvalidDecl()) 2576 return; 2577 2578 // Set access bits correctly on the directly-declared conversions. 2579 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2580 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2581 Convs->setAccess(I, (*I)->getAccess()); 2582 2583 // Determine whether we need to check for final overriders. We do 2584 // this either when there are virtual base classes (in which case we 2585 // may end up finding multiple final overriders for a given virtual 2586 // function) or any of the base classes is abstract (in which case 2587 // we might detect that this class is abstract). 2588 bool CheckFinalOverriders = false; 2589 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2590 !Record->isDependentType()) { 2591 if (Record->getNumVBases()) 2592 CheckFinalOverriders = true; 2593 else if (!Record->isAbstract()) { 2594 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2595 BEnd = Record->bases_end(); 2596 B != BEnd; ++B) { 2597 CXXRecordDecl *BaseDecl 2598 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2599 if (BaseDecl->isAbstract()) { 2600 CheckFinalOverriders = true; 2601 break; 2602 } 2603 } 2604 } 2605 } 2606 2607 if (CheckFinalOverriders) { 2608 CXXFinalOverriderMap FinalOverriders; 2609 Record->getFinalOverriders(FinalOverriders); 2610 2611 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2612 MEnd = FinalOverriders.end(); 2613 M != MEnd; ++M) { 2614 for (OverridingMethods::iterator SO = M->second.begin(), 2615 SOEnd = M->second.end(); 2616 SO != SOEnd; ++SO) { 2617 assert(SO->second.size() > 0 && 2618 "All virtual functions have overridding virtual functions"); 2619 if (SO->second.size() == 1) { 2620 // C++ [class.abstract]p4: 2621 // A class is abstract if it contains or inherits at least one 2622 // pure virtual function for which the final overrider is pure 2623 // virtual. 2624 if (SO->second.front().Method->isPure()) 2625 Record->setAbstract(true); 2626 continue; 2627 } 2628 2629 // C++ [class.virtual]p2: 2630 // In a derived class, if a virtual member function of a base 2631 // class subobject has more than one final overrider the 2632 // program is ill-formed. 2633 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2634 << (NamedDecl *)M->first << Record; 2635 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2636 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2637 OMEnd = SO->second.end(); 2638 OM != OMEnd; ++OM) 2639 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2640 << (NamedDecl *)M->first << OM->Method->getParent(); 2641 2642 Record->setInvalidDecl(); 2643 } 2644 } 2645 } 2646 2647 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2648 AbstractUsageInfo Info(*this, Record); 2649 CheckAbstractClassUsage(Info, Record); 2650 } 2651 2652 // If this is not an aggregate type and has no user-declared constructor, 2653 // complain about any non-static data members of reference or const scalar 2654 // type, since they will never get initializers. 2655 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2656 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2657 bool Complained = false; 2658 for (RecordDecl::field_iterator F = Record->field_begin(), 2659 FEnd = Record->field_end(); 2660 F != FEnd; ++F) { 2661 if (F->getType()->isReferenceType() || 2662 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2663 if (!Complained) { 2664 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2665 << Record->getTagKind() << Record; 2666 Complained = true; 2667 } 2668 2669 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2670 << F->getType()->isReferenceType() 2671 << F->getDeclName(); 2672 } 2673 } 2674 } 2675 2676 if (Record->isDynamicClass()) 2677 DynamicClasses.push_back(Record); 2678} 2679 2680void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2681 Decl *TagDecl, 2682 SourceLocation LBrac, 2683 SourceLocation RBrac, 2684 AttributeList *AttrList) { 2685 if (!TagDecl) 2686 return; 2687 2688 AdjustDeclIfTemplate(TagDecl); 2689 2690 ActOnFields(S, RLoc, TagDecl, 2691 // strict aliasing violation! 2692 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 2693 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2694 2695 CheckCompletedCXXClass( 2696 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 2697} 2698 2699namespace { 2700 /// \brief Helper class that collects exception specifications for 2701 /// implicitly-declared special member functions. 2702 class ImplicitExceptionSpecification { 2703 ASTContext &Context; 2704 bool AllowsAllExceptions; 2705 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2706 llvm::SmallVector<QualType, 4> Exceptions; 2707 2708 public: 2709 explicit ImplicitExceptionSpecification(ASTContext &Context) 2710 : Context(Context), AllowsAllExceptions(false) { } 2711 2712 /// \brief Whether the special member function should have any 2713 /// exception specification at all. 2714 bool hasExceptionSpecification() const { 2715 return !AllowsAllExceptions; 2716 } 2717 2718 /// \brief Whether the special member function should have a 2719 /// throw(...) exception specification (a Microsoft extension). 2720 bool hasAnyExceptionSpecification() const { 2721 return false; 2722 } 2723 2724 /// \brief The number of exceptions in the exception specification. 2725 unsigned size() const { return Exceptions.size(); } 2726 2727 /// \brief The set of exceptions in the exception specification. 2728 const QualType *data() const { return Exceptions.data(); } 2729 2730 /// \brief Note that 2731 void CalledDecl(CXXMethodDecl *Method) { 2732 // If we already know that we allow all exceptions, do nothing. 2733 if (AllowsAllExceptions || !Method) 2734 return; 2735 2736 const FunctionProtoType *Proto 2737 = Method->getType()->getAs<FunctionProtoType>(); 2738 2739 // If this function can throw any exceptions, make a note of that. 2740 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2741 AllowsAllExceptions = true; 2742 ExceptionsSeen.clear(); 2743 Exceptions.clear(); 2744 return; 2745 } 2746 2747 // Record the exceptions in this function's exception specification. 2748 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2749 EEnd = Proto->exception_end(); 2750 E != EEnd; ++E) 2751 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2752 Exceptions.push_back(*E); 2753 } 2754 }; 2755} 2756 2757 2758/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2759/// special functions, such as the default constructor, copy 2760/// constructor, or destructor, to the given C++ class (C++ 2761/// [special]p1). This routine can only be executed just before the 2762/// definition of the class is complete. 2763void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2764 if (!ClassDecl->hasUserDeclaredConstructor()) 2765 ++ASTContext::NumImplicitDefaultConstructors; 2766 2767 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2768 ++ASTContext::NumImplicitCopyConstructors; 2769 2770 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2771 ++ASTContext::NumImplicitCopyAssignmentOperators; 2772 2773 // If we have a dynamic class, then the copy assignment operator may be 2774 // virtual, so we have to declare it immediately. This ensures that, e.g., 2775 // it shows up in the right place in the vtable and that we diagnose 2776 // problems with the implicit exception specification. 2777 if (ClassDecl->isDynamicClass()) 2778 DeclareImplicitCopyAssignment(ClassDecl); 2779 } 2780 2781 if (!ClassDecl->hasUserDeclaredDestructor()) { 2782 ++ASTContext::NumImplicitDestructors; 2783 2784 // If we have a dynamic class, then the destructor may be virtual, so we 2785 // have to declare the destructor immediately. This ensures that, e.g., it 2786 // shows up in the right place in the vtable and that we diagnose problems 2787 // with the implicit exception specification. 2788 if (ClassDecl->isDynamicClass()) 2789 DeclareImplicitDestructor(ClassDecl); 2790 } 2791} 2792 2793void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 2794 if (!D) 2795 return; 2796 2797 TemplateParameterList *Params = 0; 2798 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2799 Params = Template->getTemplateParameters(); 2800 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2801 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2802 Params = PartialSpec->getTemplateParameters(); 2803 else 2804 return; 2805 2806 for (TemplateParameterList::iterator Param = Params->begin(), 2807 ParamEnd = Params->end(); 2808 Param != ParamEnd; ++Param) { 2809 NamedDecl *Named = cast<NamedDecl>(*Param); 2810 if (Named->getDeclName()) { 2811 S->AddDecl(Named); 2812 IdResolver.AddDecl(Named); 2813 } 2814 } 2815} 2816 2817void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2818 if (!RecordD) return; 2819 AdjustDeclIfTemplate(RecordD); 2820 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 2821 PushDeclContext(S, Record); 2822} 2823 2824void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2825 if (!RecordD) return; 2826 PopDeclContext(); 2827} 2828 2829/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2830/// parsing a top-level (non-nested) C++ class, and we are now 2831/// parsing those parts of the given Method declaration that could 2832/// not be parsed earlier (C++ [class.mem]p2), such as default 2833/// arguments. This action should enter the scope of the given 2834/// Method declaration as if we had just parsed the qualified method 2835/// name. However, it should not bring the parameters into scope; 2836/// that will be performed by ActOnDelayedCXXMethodParameter. 2837void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2838} 2839 2840/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2841/// C++ method declaration. We're (re-)introducing the given 2842/// function parameter into scope for use in parsing later parts of 2843/// the method declaration. For example, we could see an 2844/// ActOnParamDefaultArgument event for this parameter. 2845void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 2846 if (!ParamD) 2847 return; 2848 2849 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 2850 2851 // If this parameter has an unparsed default argument, clear it out 2852 // to make way for the parsed default argument. 2853 if (Param->hasUnparsedDefaultArg()) 2854 Param->setDefaultArg(0); 2855 2856 S->AddDecl(Param); 2857 if (Param->getDeclName()) 2858 IdResolver.AddDecl(Param); 2859} 2860 2861/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2862/// processing the delayed method declaration for Method. The method 2863/// declaration is now considered finished. There may be a separate 2864/// ActOnStartOfFunctionDef action later (not necessarily 2865/// immediately!) for this method, if it was also defined inside the 2866/// class body. 2867void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2868 if (!MethodD) 2869 return; 2870 2871 AdjustDeclIfTemplate(MethodD); 2872 2873 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 2874 2875 // Now that we have our default arguments, check the constructor 2876 // again. It could produce additional diagnostics or affect whether 2877 // the class has implicitly-declared destructors, among other 2878 // things. 2879 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2880 CheckConstructor(Constructor); 2881 2882 // Check the default arguments, which we may have added. 2883 if (!Method->isInvalidDecl()) 2884 CheckCXXDefaultArguments(Method); 2885} 2886 2887/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2888/// the well-formedness of the constructor declarator @p D with type @p 2889/// R. If there are any errors in the declarator, this routine will 2890/// emit diagnostics and set the invalid bit to true. In any case, the type 2891/// will be updated to reflect a well-formed type for the constructor and 2892/// returned. 2893QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2894 StorageClass &SC) { 2895 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2896 2897 // C++ [class.ctor]p3: 2898 // A constructor shall not be virtual (10.3) or static (9.4). A 2899 // constructor can be invoked for a const, volatile or const 2900 // volatile object. A constructor shall not be declared const, 2901 // volatile, or const volatile (9.3.2). 2902 if (isVirtual) { 2903 if (!D.isInvalidType()) 2904 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2905 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2906 << SourceRange(D.getIdentifierLoc()); 2907 D.setInvalidType(); 2908 } 2909 if (SC == SC_Static) { 2910 if (!D.isInvalidType()) 2911 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2912 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2913 << SourceRange(D.getIdentifierLoc()); 2914 D.setInvalidType(); 2915 SC = SC_None; 2916 } 2917 2918 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2919 if (FTI.TypeQuals != 0) { 2920 if (FTI.TypeQuals & Qualifiers::Const) 2921 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2922 << "const" << SourceRange(D.getIdentifierLoc()); 2923 if (FTI.TypeQuals & Qualifiers::Volatile) 2924 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2925 << "volatile" << SourceRange(D.getIdentifierLoc()); 2926 if (FTI.TypeQuals & Qualifiers::Restrict) 2927 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2928 << "restrict" << SourceRange(D.getIdentifierLoc()); 2929 } 2930 2931 // Rebuild the function type "R" without any type qualifiers (in 2932 // case any of the errors above fired) and with "void" as the 2933 // return type, since constructors don't have return types. 2934 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2935 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2936 Proto->getNumArgs(), 2937 Proto->isVariadic(), 0, 2938 Proto->hasExceptionSpec(), 2939 Proto->hasAnyExceptionSpec(), 2940 Proto->getNumExceptions(), 2941 Proto->exception_begin(), 2942 Proto->getExtInfo()); 2943} 2944 2945/// CheckConstructor - Checks a fully-formed constructor for 2946/// well-formedness, issuing any diagnostics required. Returns true if 2947/// the constructor declarator is invalid. 2948void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2949 CXXRecordDecl *ClassDecl 2950 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2951 if (!ClassDecl) 2952 return Constructor->setInvalidDecl(); 2953 2954 // C++ [class.copy]p3: 2955 // A declaration of a constructor for a class X is ill-formed if 2956 // its first parameter is of type (optionally cv-qualified) X and 2957 // either there are no other parameters or else all other 2958 // parameters have default arguments. 2959 if (!Constructor->isInvalidDecl() && 2960 ((Constructor->getNumParams() == 1) || 2961 (Constructor->getNumParams() > 1 && 2962 Constructor->getParamDecl(1)->hasDefaultArg())) && 2963 Constructor->getTemplateSpecializationKind() 2964 != TSK_ImplicitInstantiation) { 2965 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2966 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2967 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2968 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2969 const char *ConstRef 2970 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2971 : " const &"; 2972 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2973 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 2974 2975 // FIXME: Rather that making the constructor invalid, we should endeavor 2976 // to fix the type. 2977 Constructor->setInvalidDecl(); 2978 } 2979 } 2980 2981 // Notify the class that we've added a constructor. In principle we 2982 // don't need to do this for out-of-line declarations; in practice 2983 // we only instantiate the most recent declaration of a method, so 2984 // we have to call this for everything but friends. 2985 if (!Constructor->getFriendObjectKind()) 2986 ClassDecl->addedConstructor(Context, Constructor); 2987} 2988 2989/// CheckDestructor - Checks a fully-formed destructor definition for 2990/// well-formedness, issuing any diagnostics required. Returns true 2991/// on error. 2992bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2993 CXXRecordDecl *RD = Destructor->getParent(); 2994 2995 if (Destructor->isVirtual()) { 2996 SourceLocation Loc; 2997 2998 if (!Destructor->isImplicit()) 2999 Loc = Destructor->getLocation(); 3000 else 3001 Loc = RD->getLocation(); 3002 3003 // If we have a virtual destructor, look up the deallocation function 3004 FunctionDecl *OperatorDelete = 0; 3005 DeclarationName Name = 3006 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3007 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3008 return true; 3009 3010 MarkDeclarationReferenced(Loc, OperatorDelete); 3011 3012 Destructor->setOperatorDelete(OperatorDelete); 3013 } 3014 3015 return false; 3016} 3017 3018static inline bool 3019FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3020 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3021 FTI.ArgInfo[0].Param && 3022 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 3023} 3024 3025/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3026/// the well-formednes of the destructor declarator @p D with type @p 3027/// R. If there are any errors in the declarator, this routine will 3028/// emit diagnostics and set the declarator to invalid. Even if this happens, 3029/// will be updated to reflect a well-formed type for the destructor and 3030/// returned. 3031QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3032 StorageClass& SC) { 3033 // C++ [class.dtor]p1: 3034 // [...] A typedef-name that names a class is a class-name 3035 // (7.1.3); however, a typedef-name that names a class shall not 3036 // be used as the identifier in the declarator for a destructor 3037 // declaration. 3038 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3039 if (isa<TypedefType>(DeclaratorType)) 3040 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3041 << DeclaratorType; 3042 3043 // C++ [class.dtor]p2: 3044 // A destructor is used to destroy objects of its class type. A 3045 // destructor takes no parameters, and no return type can be 3046 // specified for it (not even void). The address of a destructor 3047 // shall not be taken. A destructor shall not be static. A 3048 // destructor can be invoked for a const, volatile or const 3049 // volatile object. A destructor shall not be declared const, 3050 // volatile or const volatile (9.3.2). 3051 if (SC == SC_Static) { 3052 if (!D.isInvalidType()) 3053 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3054 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3055 << SourceRange(D.getIdentifierLoc()) 3056 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3057 3058 SC = SC_None; 3059 } 3060 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3061 // Destructors don't have return types, but the parser will 3062 // happily parse something like: 3063 // 3064 // class X { 3065 // float ~X(); 3066 // }; 3067 // 3068 // The return type will be eliminated later. 3069 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3070 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3071 << SourceRange(D.getIdentifierLoc()); 3072 } 3073 3074 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3075 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3076 if (FTI.TypeQuals & Qualifiers::Const) 3077 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3078 << "const" << SourceRange(D.getIdentifierLoc()); 3079 if (FTI.TypeQuals & Qualifiers::Volatile) 3080 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3081 << "volatile" << SourceRange(D.getIdentifierLoc()); 3082 if (FTI.TypeQuals & Qualifiers::Restrict) 3083 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3084 << "restrict" << SourceRange(D.getIdentifierLoc()); 3085 D.setInvalidType(); 3086 } 3087 3088 // Make sure we don't have any parameters. 3089 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3090 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3091 3092 // Delete the parameters. 3093 FTI.freeArgs(); 3094 D.setInvalidType(); 3095 } 3096 3097 // Make sure the destructor isn't variadic. 3098 if (FTI.isVariadic) { 3099 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3100 D.setInvalidType(); 3101 } 3102 3103 // Rebuild the function type "R" without any type qualifiers or 3104 // parameters (in case any of the errors above fired) and with 3105 // "void" as the return type, since destructors don't have return 3106 // types. 3107 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3108 if (!Proto) 3109 return QualType(); 3110 3111 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3112 Proto->hasExceptionSpec(), 3113 Proto->hasAnyExceptionSpec(), 3114 Proto->getNumExceptions(), 3115 Proto->exception_begin(), 3116 Proto->getExtInfo()); 3117} 3118 3119/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3120/// well-formednes of the conversion function declarator @p D with 3121/// type @p R. If there are any errors in the declarator, this routine 3122/// will emit diagnostics and return true. Otherwise, it will return 3123/// false. Either way, the type @p R will be updated to reflect a 3124/// well-formed type for the conversion operator. 3125void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3126 StorageClass& SC) { 3127 // C++ [class.conv.fct]p1: 3128 // Neither parameter types nor return type can be specified. The 3129 // type of a conversion function (8.3.5) is "function taking no 3130 // parameter returning conversion-type-id." 3131 if (SC == SC_Static) { 3132 if (!D.isInvalidType()) 3133 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3134 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3135 << SourceRange(D.getIdentifierLoc()); 3136 D.setInvalidType(); 3137 SC = SC_None; 3138 } 3139 3140 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3141 3142 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3143 // Conversion functions don't have return types, but the parser will 3144 // happily parse something like: 3145 // 3146 // class X { 3147 // float operator bool(); 3148 // }; 3149 // 3150 // The return type will be changed later anyway. 3151 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3152 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3153 << SourceRange(D.getIdentifierLoc()); 3154 D.setInvalidType(); 3155 } 3156 3157 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3158 3159 // Make sure we don't have any parameters. 3160 if (Proto->getNumArgs() > 0) { 3161 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3162 3163 // Delete the parameters. 3164 D.getTypeObject(0).Fun.freeArgs(); 3165 D.setInvalidType(); 3166 } else if (Proto->isVariadic()) { 3167 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3168 D.setInvalidType(); 3169 } 3170 3171 // Diagnose "&operator bool()" and other such nonsense. This 3172 // is actually a gcc extension which we don't support. 3173 if (Proto->getResultType() != ConvType) { 3174 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3175 << Proto->getResultType(); 3176 D.setInvalidType(); 3177 ConvType = Proto->getResultType(); 3178 } 3179 3180 // C++ [class.conv.fct]p4: 3181 // The conversion-type-id shall not represent a function type nor 3182 // an array type. 3183 if (ConvType->isArrayType()) { 3184 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3185 ConvType = Context.getPointerType(ConvType); 3186 D.setInvalidType(); 3187 } else if (ConvType->isFunctionType()) { 3188 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3189 ConvType = Context.getPointerType(ConvType); 3190 D.setInvalidType(); 3191 } 3192 3193 // Rebuild the function type "R" without any parameters (in case any 3194 // of the errors above fired) and with the conversion type as the 3195 // return type. 3196 if (D.isInvalidType()) { 3197 R = Context.getFunctionType(ConvType, 0, 0, false, 3198 Proto->getTypeQuals(), 3199 Proto->hasExceptionSpec(), 3200 Proto->hasAnyExceptionSpec(), 3201 Proto->getNumExceptions(), 3202 Proto->exception_begin(), 3203 Proto->getExtInfo()); 3204 } 3205 3206 // C++0x explicit conversion operators. 3207 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3208 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3209 diag::warn_explicit_conversion_functions) 3210 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3211} 3212 3213/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3214/// the declaration of the given C++ conversion function. This routine 3215/// is responsible for recording the conversion function in the C++ 3216/// class, if possible. 3217Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3218 assert(Conversion && "Expected to receive a conversion function declaration"); 3219 3220 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3221 3222 // Make sure we aren't redeclaring the conversion function. 3223 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3224 3225 // C++ [class.conv.fct]p1: 3226 // [...] A conversion function is never used to convert a 3227 // (possibly cv-qualified) object to the (possibly cv-qualified) 3228 // same object type (or a reference to it), to a (possibly 3229 // cv-qualified) base class of that type (or a reference to it), 3230 // or to (possibly cv-qualified) void. 3231 // FIXME: Suppress this warning if the conversion function ends up being a 3232 // virtual function that overrides a virtual function in a base class. 3233 QualType ClassType 3234 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3235 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3236 ConvType = ConvTypeRef->getPointeeType(); 3237 if (ConvType->isRecordType()) { 3238 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3239 if (ConvType == ClassType) 3240 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3241 << ClassType; 3242 else if (IsDerivedFrom(ClassType, ConvType)) 3243 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3244 << ClassType << ConvType; 3245 } else if (ConvType->isVoidType()) { 3246 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3247 << ClassType << ConvType; 3248 } 3249 3250 if (Conversion->getPrimaryTemplate()) { 3251 // ignore specializations 3252 } else if (Conversion->getPreviousDeclaration()) { 3253 if (FunctionTemplateDecl *ConversionTemplate 3254 = Conversion->getDescribedFunctionTemplate()) { 3255 if (ClassDecl->replaceConversion( 3256 ConversionTemplate->getPreviousDeclaration(), 3257 ConversionTemplate)) 3258 return ConversionTemplate; 3259 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3260 Conversion)) 3261 return Conversion; 3262 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3263 } else if (FunctionTemplateDecl *ConversionTemplate 3264 = Conversion->getDescribedFunctionTemplate()) 3265 ClassDecl->addConversionFunction(ConversionTemplate); 3266 else 3267 ClassDecl->addConversionFunction(Conversion); 3268 3269 return Conversion; 3270} 3271 3272//===----------------------------------------------------------------------===// 3273// Namespace Handling 3274//===----------------------------------------------------------------------===// 3275 3276 3277 3278/// ActOnStartNamespaceDef - This is called at the start of a namespace 3279/// definition. 3280Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3281 SourceLocation InlineLoc, 3282 SourceLocation IdentLoc, 3283 IdentifierInfo *II, 3284 SourceLocation LBrace, 3285 AttributeList *AttrList) { 3286 // anonymous namespace starts at its left brace 3287 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3288 (II ? IdentLoc : LBrace) , II); 3289 Namespc->setLBracLoc(LBrace); 3290 Namespc->setInline(InlineLoc.isValid()); 3291 3292 Scope *DeclRegionScope = NamespcScope->getParent(); 3293 3294 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3295 3296 if (const VisibilityAttr *attr = Namespc->getAttr<VisibilityAttr>()) 3297 PushVisibilityAttr(attr); 3298 3299 if (II) { 3300 // C++ [namespace.def]p2: 3301 // The identifier in an original-namespace-definition shall not have been 3302 // previously defined in the declarative region in which the 3303 // original-namespace-definition appears. The identifier in an 3304 // original-namespace-definition is the name of the namespace. Subsequently 3305 // in that declarative region, it is treated as an original-namespace-name. 3306 3307 NamedDecl *PrevDecl 3308 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3309 ForRedeclaration); 3310 3311 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3312 // This is an extended namespace definition. 3313 if (Namespc->isInline() != OrigNS->isInline()) { 3314 // inline-ness must match 3315 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3316 << Namespc->isInline(); 3317 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3318 Namespc->setInvalidDecl(); 3319 // Recover by ignoring the new namespace's inline status. 3320 Namespc->setInline(OrigNS->isInline()); 3321 } 3322 3323 // Attach this namespace decl to the chain of extended namespace 3324 // definitions. 3325 OrigNS->setNextNamespace(Namespc); 3326 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3327 3328 // Remove the previous declaration from the scope. 3329 if (DeclRegionScope->isDeclScope(OrigNS)) { 3330 IdResolver.RemoveDecl(OrigNS); 3331 DeclRegionScope->RemoveDecl(OrigNS); 3332 } 3333 } else if (PrevDecl) { 3334 // This is an invalid name redefinition. 3335 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3336 << Namespc->getDeclName(); 3337 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3338 Namespc->setInvalidDecl(); 3339 // Continue on to push Namespc as current DeclContext and return it. 3340 } else if (II->isStr("std") && 3341 CurContext->getRedeclContext()->isTranslationUnit()) { 3342 // This is the first "real" definition of the namespace "std", so update 3343 // our cache of the "std" namespace to point at this definition. 3344 if (NamespaceDecl *StdNS = getStdNamespace()) { 3345 // We had already defined a dummy namespace "std". Link this new 3346 // namespace definition to the dummy namespace "std". 3347 StdNS->setNextNamespace(Namespc); 3348 StdNS->setLocation(IdentLoc); 3349 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3350 } 3351 3352 // Make our StdNamespace cache point at the first real definition of the 3353 // "std" namespace. 3354 StdNamespace = Namespc; 3355 } 3356 3357 PushOnScopeChains(Namespc, DeclRegionScope); 3358 } else { 3359 // Anonymous namespaces. 3360 assert(Namespc->isAnonymousNamespace()); 3361 3362 // Link the anonymous namespace into its parent. 3363 NamespaceDecl *PrevDecl; 3364 DeclContext *Parent = CurContext->getRedeclContext(); 3365 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3366 PrevDecl = TU->getAnonymousNamespace(); 3367 TU->setAnonymousNamespace(Namespc); 3368 } else { 3369 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3370 PrevDecl = ND->getAnonymousNamespace(); 3371 ND->setAnonymousNamespace(Namespc); 3372 } 3373 3374 // Link the anonymous namespace with its previous declaration. 3375 if (PrevDecl) { 3376 assert(PrevDecl->isAnonymousNamespace()); 3377 assert(!PrevDecl->getNextNamespace()); 3378 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3379 PrevDecl->setNextNamespace(Namespc); 3380 3381 if (Namespc->isInline() != PrevDecl->isInline()) { 3382 // inline-ness must match 3383 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3384 << Namespc->isInline(); 3385 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3386 Namespc->setInvalidDecl(); 3387 // Recover by ignoring the new namespace's inline status. 3388 Namespc->setInline(PrevDecl->isInline()); 3389 } 3390 } 3391 3392 CurContext->addDecl(Namespc); 3393 3394 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3395 // behaves as if it were replaced by 3396 // namespace unique { /* empty body */ } 3397 // using namespace unique; 3398 // namespace unique { namespace-body } 3399 // where all occurrences of 'unique' in a translation unit are 3400 // replaced by the same identifier and this identifier differs 3401 // from all other identifiers in the entire program. 3402 3403 // We just create the namespace with an empty name and then add an 3404 // implicit using declaration, just like the standard suggests. 3405 // 3406 // CodeGen enforces the "universally unique" aspect by giving all 3407 // declarations semantically contained within an anonymous 3408 // namespace internal linkage. 3409 3410 if (!PrevDecl) { 3411 UsingDirectiveDecl* UD 3412 = UsingDirectiveDecl::Create(Context, CurContext, 3413 /* 'using' */ LBrace, 3414 /* 'namespace' */ SourceLocation(), 3415 /* qualifier */ SourceRange(), 3416 /* NNS */ NULL, 3417 /* identifier */ SourceLocation(), 3418 Namespc, 3419 /* Ancestor */ CurContext); 3420 UD->setImplicit(); 3421 CurContext->addDecl(UD); 3422 } 3423 } 3424 3425 // Although we could have an invalid decl (i.e. the namespace name is a 3426 // redefinition), push it as current DeclContext and try to continue parsing. 3427 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3428 // for the namespace has the declarations that showed up in that particular 3429 // namespace definition. 3430 PushDeclContext(NamespcScope, Namespc); 3431 return Namespc; 3432} 3433 3434/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3435/// is a namespace alias, returns the namespace it points to. 3436static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3437 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3438 return AD->getNamespace(); 3439 return dyn_cast_or_null<NamespaceDecl>(D); 3440} 3441 3442/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3443/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3444void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3445 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3446 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3447 Namespc->setRBracLoc(RBrace); 3448 PopDeclContext(); 3449 if (Namespc->hasAttr<VisibilityAttr>()) 3450 PopPragmaVisibility(); 3451} 3452 3453CXXRecordDecl *Sema::getStdBadAlloc() const { 3454 return cast_or_null<CXXRecordDecl>( 3455 StdBadAlloc.get(Context.getExternalSource())); 3456} 3457 3458NamespaceDecl *Sema::getStdNamespace() const { 3459 return cast_or_null<NamespaceDecl>( 3460 StdNamespace.get(Context.getExternalSource())); 3461} 3462 3463/// \brief Retrieve the special "std" namespace, which may require us to 3464/// implicitly define the namespace. 3465NamespaceDecl *Sema::getOrCreateStdNamespace() { 3466 if (!StdNamespace) { 3467 // The "std" namespace has not yet been defined, so build one implicitly. 3468 StdNamespace = NamespaceDecl::Create(Context, 3469 Context.getTranslationUnitDecl(), 3470 SourceLocation(), 3471 &PP.getIdentifierTable().get("std")); 3472 getStdNamespace()->setImplicit(true); 3473 } 3474 3475 return getStdNamespace(); 3476} 3477 3478Decl *Sema::ActOnUsingDirective(Scope *S, 3479 SourceLocation UsingLoc, 3480 SourceLocation NamespcLoc, 3481 CXXScopeSpec &SS, 3482 SourceLocation IdentLoc, 3483 IdentifierInfo *NamespcName, 3484 AttributeList *AttrList) { 3485 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3486 assert(NamespcName && "Invalid NamespcName."); 3487 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3488 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3489 3490 UsingDirectiveDecl *UDir = 0; 3491 NestedNameSpecifier *Qualifier = 0; 3492 if (SS.isSet()) 3493 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3494 3495 // Lookup namespace name. 3496 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3497 LookupParsedName(R, S, &SS); 3498 if (R.isAmbiguous()) 3499 return 0; 3500 3501 if (R.empty()) { 3502 // Allow "using namespace std;" or "using namespace ::std;" even if 3503 // "std" hasn't been defined yet, for GCC compatibility. 3504 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3505 NamespcName->isStr("std")) { 3506 Diag(IdentLoc, diag::ext_using_undefined_std); 3507 R.addDecl(getOrCreateStdNamespace()); 3508 R.resolveKind(); 3509 } 3510 // Otherwise, attempt typo correction. 3511 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3512 CTC_NoKeywords, 0)) { 3513 if (R.getAsSingle<NamespaceDecl>() || 3514 R.getAsSingle<NamespaceAliasDecl>()) { 3515 if (DeclContext *DC = computeDeclContext(SS, false)) 3516 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3517 << NamespcName << DC << Corrected << SS.getRange() 3518 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3519 else 3520 Diag(IdentLoc, diag::err_using_directive_suggest) 3521 << NamespcName << Corrected 3522 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3523 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3524 << Corrected; 3525 3526 NamespcName = Corrected.getAsIdentifierInfo(); 3527 } else { 3528 R.clear(); 3529 R.setLookupName(NamespcName); 3530 } 3531 } 3532 } 3533 3534 if (!R.empty()) { 3535 NamedDecl *Named = R.getFoundDecl(); 3536 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3537 && "expected namespace decl"); 3538 // C++ [namespace.udir]p1: 3539 // A using-directive specifies that the names in the nominated 3540 // namespace can be used in the scope in which the 3541 // using-directive appears after the using-directive. During 3542 // unqualified name lookup (3.4.1), the names appear as if they 3543 // were declared in the nearest enclosing namespace which 3544 // contains both the using-directive and the nominated 3545 // namespace. [Note: in this context, "contains" means "contains 3546 // directly or indirectly". ] 3547 3548 // Find enclosing context containing both using-directive and 3549 // nominated namespace. 3550 NamespaceDecl *NS = getNamespaceDecl(Named); 3551 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3552 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3553 CommonAncestor = CommonAncestor->getParent(); 3554 3555 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3556 SS.getRange(), 3557 (NestedNameSpecifier *)SS.getScopeRep(), 3558 IdentLoc, Named, CommonAncestor); 3559 PushUsingDirective(S, UDir); 3560 } else { 3561 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3562 } 3563 3564 // FIXME: We ignore attributes for now. 3565 delete AttrList; 3566 return UDir; 3567} 3568 3569void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3570 // If scope has associated entity, then using directive is at namespace 3571 // or translation unit scope. We add UsingDirectiveDecls, into 3572 // it's lookup structure. 3573 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3574 Ctx->addDecl(UDir); 3575 else 3576 // Otherwise it is block-sope. using-directives will affect lookup 3577 // only to the end of scope. 3578 S->PushUsingDirective(UDir); 3579} 3580 3581 3582Decl *Sema::ActOnUsingDeclaration(Scope *S, 3583 AccessSpecifier AS, 3584 bool HasUsingKeyword, 3585 SourceLocation UsingLoc, 3586 CXXScopeSpec &SS, 3587 UnqualifiedId &Name, 3588 AttributeList *AttrList, 3589 bool IsTypeName, 3590 SourceLocation TypenameLoc) { 3591 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3592 3593 switch (Name.getKind()) { 3594 case UnqualifiedId::IK_Identifier: 3595 case UnqualifiedId::IK_OperatorFunctionId: 3596 case UnqualifiedId::IK_LiteralOperatorId: 3597 case UnqualifiedId::IK_ConversionFunctionId: 3598 break; 3599 3600 case UnqualifiedId::IK_ConstructorName: 3601 case UnqualifiedId::IK_ConstructorTemplateId: 3602 // C++0x inherited constructors. 3603 if (getLangOptions().CPlusPlus0x) break; 3604 3605 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3606 << SS.getRange(); 3607 return 0; 3608 3609 case UnqualifiedId::IK_DestructorName: 3610 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3611 << SS.getRange(); 3612 return 0; 3613 3614 case UnqualifiedId::IK_TemplateId: 3615 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3616 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3617 return 0; 3618 } 3619 3620 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3621 DeclarationName TargetName = TargetNameInfo.getName(); 3622 if (!TargetName) 3623 return 0; 3624 3625 // Warn about using declarations. 3626 // TODO: store that the declaration was written without 'using' and 3627 // talk about access decls instead of using decls in the 3628 // diagnostics. 3629 if (!HasUsingKeyword) { 3630 UsingLoc = Name.getSourceRange().getBegin(); 3631 3632 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3633 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3634 } 3635 3636 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3637 TargetNameInfo, AttrList, 3638 /* IsInstantiation */ false, 3639 IsTypeName, TypenameLoc); 3640 if (UD) 3641 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3642 3643 return UD; 3644} 3645 3646/// \brief Determine whether a using declaration considers the given 3647/// declarations as "equivalent", e.g., if they are redeclarations of 3648/// the same entity or are both typedefs of the same type. 3649static bool 3650IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3651 bool &SuppressRedeclaration) { 3652 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3653 SuppressRedeclaration = false; 3654 return true; 3655 } 3656 3657 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3658 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3659 SuppressRedeclaration = true; 3660 return Context.hasSameType(TD1->getUnderlyingType(), 3661 TD2->getUnderlyingType()); 3662 } 3663 3664 return false; 3665} 3666 3667 3668/// Determines whether to create a using shadow decl for a particular 3669/// decl, given the set of decls existing prior to this using lookup. 3670bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3671 const LookupResult &Previous) { 3672 // Diagnose finding a decl which is not from a base class of the 3673 // current class. We do this now because there are cases where this 3674 // function will silently decide not to build a shadow decl, which 3675 // will pre-empt further diagnostics. 3676 // 3677 // We don't need to do this in C++0x because we do the check once on 3678 // the qualifier. 3679 // 3680 // FIXME: diagnose the following if we care enough: 3681 // struct A { int foo; }; 3682 // struct B : A { using A::foo; }; 3683 // template <class T> struct C : A {}; 3684 // template <class T> struct D : C<T> { using B::foo; } // <--- 3685 // This is invalid (during instantiation) in C++03 because B::foo 3686 // resolves to the using decl in B, which is not a base class of D<T>. 3687 // We can't diagnose it immediately because C<T> is an unknown 3688 // specialization. The UsingShadowDecl in D<T> then points directly 3689 // to A::foo, which will look well-formed when we instantiate. 3690 // The right solution is to not collapse the shadow-decl chain. 3691 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3692 DeclContext *OrigDC = Orig->getDeclContext(); 3693 3694 // Handle enums and anonymous structs. 3695 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3696 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3697 while (OrigRec->isAnonymousStructOrUnion()) 3698 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3699 3700 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3701 if (OrigDC == CurContext) { 3702 Diag(Using->getLocation(), 3703 diag::err_using_decl_nested_name_specifier_is_current_class) 3704 << Using->getNestedNameRange(); 3705 Diag(Orig->getLocation(), diag::note_using_decl_target); 3706 return true; 3707 } 3708 3709 Diag(Using->getNestedNameRange().getBegin(), 3710 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3711 << Using->getTargetNestedNameDecl() 3712 << cast<CXXRecordDecl>(CurContext) 3713 << Using->getNestedNameRange(); 3714 Diag(Orig->getLocation(), diag::note_using_decl_target); 3715 return true; 3716 } 3717 } 3718 3719 if (Previous.empty()) return false; 3720 3721 NamedDecl *Target = Orig; 3722 if (isa<UsingShadowDecl>(Target)) 3723 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3724 3725 // If the target happens to be one of the previous declarations, we 3726 // don't have a conflict. 3727 // 3728 // FIXME: but we might be increasing its access, in which case we 3729 // should redeclare it. 3730 NamedDecl *NonTag = 0, *Tag = 0; 3731 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3732 I != E; ++I) { 3733 NamedDecl *D = (*I)->getUnderlyingDecl(); 3734 bool Result; 3735 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3736 return Result; 3737 3738 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3739 } 3740 3741 if (Target->isFunctionOrFunctionTemplate()) { 3742 FunctionDecl *FD; 3743 if (isa<FunctionTemplateDecl>(Target)) 3744 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3745 else 3746 FD = cast<FunctionDecl>(Target); 3747 3748 NamedDecl *OldDecl = 0; 3749 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3750 case Ovl_Overload: 3751 return false; 3752 3753 case Ovl_NonFunction: 3754 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3755 break; 3756 3757 // We found a decl with the exact signature. 3758 case Ovl_Match: 3759 // If we're in a record, we want to hide the target, so we 3760 // return true (without a diagnostic) to tell the caller not to 3761 // build a shadow decl. 3762 if (CurContext->isRecord()) 3763 return true; 3764 3765 // If we're not in a record, this is an error. 3766 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3767 break; 3768 } 3769 3770 Diag(Target->getLocation(), diag::note_using_decl_target); 3771 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3772 return true; 3773 } 3774 3775 // Target is not a function. 3776 3777 if (isa<TagDecl>(Target)) { 3778 // No conflict between a tag and a non-tag. 3779 if (!Tag) return false; 3780 3781 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3782 Diag(Target->getLocation(), diag::note_using_decl_target); 3783 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3784 return true; 3785 } 3786 3787 // No conflict between a tag and a non-tag. 3788 if (!NonTag) return false; 3789 3790 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3791 Diag(Target->getLocation(), diag::note_using_decl_target); 3792 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3793 return true; 3794} 3795 3796/// Builds a shadow declaration corresponding to a 'using' declaration. 3797UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3798 UsingDecl *UD, 3799 NamedDecl *Orig) { 3800 3801 // If we resolved to another shadow declaration, just coalesce them. 3802 NamedDecl *Target = Orig; 3803 if (isa<UsingShadowDecl>(Target)) { 3804 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3805 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3806 } 3807 3808 UsingShadowDecl *Shadow 3809 = UsingShadowDecl::Create(Context, CurContext, 3810 UD->getLocation(), UD, Target); 3811 UD->addShadowDecl(Shadow); 3812 3813 if (S) 3814 PushOnScopeChains(Shadow, S); 3815 else 3816 CurContext->addDecl(Shadow); 3817 Shadow->setAccess(UD->getAccess()); 3818 3819 // Register it as a conversion if appropriate. 3820 if (Shadow->getDeclName().getNameKind() 3821 == DeclarationName::CXXConversionFunctionName) 3822 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3823 3824 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3825 Shadow->setInvalidDecl(); 3826 3827 return Shadow; 3828} 3829 3830/// Hides a using shadow declaration. This is required by the current 3831/// using-decl implementation when a resolvable using declaration in a 3832/// class is followed by a declaration which would hide or override 3833/// one or more of the using decl's targets; for example: 3834/// 3835/// struct Base { void foo(int); }; 3836/// struct Derived : Base { 3837/// using Base::foo; 3838/// void foo(int); 3839/// }; 3840/// 3841/// The governing language is C++03 [namespace.udecl]p12: 3842/// 3843/// When a using-declaration brings names from a base class into a 3844/// derived class scope, member functions in the derived class 3845/// override and/or hide member functions with the same name and 3846/// parameter types in a base class (rather than conflicting). 3847/// 3848/// There are two ways to implement this: 3849/// (1) optimistically create shadow decls when they're not hidden 3850/// by existing declarations, or 3851/// (2) don't create any shadow decls (or at least don't make them 3852/// visible) until we've fully parsed/instantiated the class. 3853/// The problem with (1) is that we might have to retroactively remove 3854/// a shadow decl, which requires several O(n) operations because the 3855/// decl structures are (very reasonably) not designed for removal. 3856/// (2) avoids this but is very fiddly and phase-dependent. 3857void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3858 if (Shadow->getDeclName().getNameKind() == 3859 DeclarationName::CXXConversionFunctionName) 3860 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3861 3862 // Remove it from the DeclContext... 3863 Shadow->getDeclContext()->removeDecl(Shadow); 3864 3865 // ...and the scope, if applicable... 3866 if (S) { 3867 S->RemoveDecl(Shadow); 3868 IdResolver.RemoveDecl(Shadow); 3869 } 3870 3871 // ...and the using decl. 3872 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3873 3874 // TODO: complain somehow if Shadow was used. It shouldn't 3875 // be possible for this to happen, because...? 3876} 3877 3878/// Builds a using declaration. 3879/// 3880/// \param IsInstantiation - Whether this call arises from an 3881/// instantiation of an unresolved using declaration. We treat 3882/// the lookup differently for these declarations. 3883NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3884 SourceLocation UsingLoc, 3885 CXXScopeSpec &SS, 3886 const DeclarationNameInfo &NameInfo, 3887 AttributeList *AttrList, 3888 bool IsInstantiation, 3889 bool IsTypeName, 3890 SourceLocation TypenameLoc) { 3891 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3892 SourceLocation IdentLoc = NameInfo.getLoc(); 3893 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3894 3895 // FIXME: We ignore attributes for now. 3896 delete AttrList; 3897 3898 if (SS.isEmpty()) { 3899 Diag(IdentLoc, diag::err_using_requires_qualname); 3900 return 0; 3901 } 3902 3903 // Do the redeclaration lookup in the current scope. 3904 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 3905 ForRedeclaration); 3906 Previous.setHideTags(false); 3907 if (S) { 3908 LookupName(Previous, S); 3909 3910 // It is really dumb that we have to do this. 3911 LookupResult::Filter F = Previous.makeFilter(); 3912 while (F.hasNext()) { 3913 NamedDecl *D = F.next(); 3914 if (!isDeclInScope(D, CurContext, S)) 3915 F.erase(); 3916 } 3917 F.done(); 3918 } else { 3919 assert(IsInstantiation && "no scope in non-instantiation"); 3920 assert(CurContext->isRecord() && "scope not record in instantiation"); 3921 LookupQualifiedName(Previous, CurContext); 3922 } 3923 3924 NestedNameSpecifier *NNS = 3925 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3926 3927 // Check for invalid redeclarations. 3928 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3929 return 0; 3930 3931 // Check for bad qualifiers. 3932 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3933 return 0; 3934 3935 DeclContext *LookupContext = computeDeclContext(SS); 3936 NamedDecl *D; 3937 if (!LookupContext) { 3938 if (IsTypeName) { 3939 // FIXME: not all declaration name kinds are legal here 3940 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3941 UsingLoc, TypenameLoc, 3942 SS.getRange(), NNS, 3943 IdentLoc, NameInfo.getName()); 3944 } else { 3945 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3946 UsingLoc, SS.getRange(), 3947 NNS, NameInfo); 3948 } 3949 } else { 3950 D = UsingDecl::Create(Context, CurContext, 3951 SS.getRange(), UsingLoc, NNS, NameInfo, 3952 IsTypeName); 3953 } 3954 D->setAccess(AS); 3955 CurContext->addDecl(D); 3956 3957 if (!LookupContext) return D; 3958 UsingDecl *UD = cast<UsingDecl>(D); 3959 3960 if (RequireCompleteDeclContext(SS, LookupContext)) { 3961 UD->setInvalidDecl(); 3962 return UD; 3963 } 3964 3965 // Look up the target name. 3966 3967 LookupResult R(*this, NameInfo, LookupOrdinaryName); 3968 3969 // Unlike most lookups, we don't always want to hide tag 3970 // declarations: tag names are visible through the using declaration 3971 // even if hidden by ordinary names, *except* in a dependent context 3972 // where it's important for the sanity of two-phase lookup. 3973 if (!IsInstantiation) 3974 R.setHideTags(false); 3975 3976 LookupQualifiedName(R, LookupContext); 3977 3978 if (R.empty()) { 3979 Diag(IdentLoc, diag::err_no_member) 3980 << NameInfo.getName() << LookupContext << SS.getRange(); 3981 UD->setInvalidDecl(); 3982 return UD; 3983 } 3984 3985 if (R.isAmbiguous()) { 3986 UD->setInvalidDecl(); 3987 return UD; 3988 } 3989 3990 if (IsTypeName) { 3991 // If we asked for a typename and got a non-type decl, error out. 3992 if (!R.getAsSingle<TypeDecl>()) { 3993 Diag(IdentLoc, diag::err_using_typename_non_type); 3994 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3995 Diag((*I)->getUnderlyingDecl()->getLocation(), 3996 diag::note_using_decl_target); 3997 UD->setInvalidDecl(); 3998 return UD; 3999 } 4000 } else { 4001 // If we asked for a non-typename and we got a type, error out, 4002 // but only if this is an instantiation of an unresolved using 4003 // decl. Otherwise just silently find the type name. 4004 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 4005 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 4006 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 4007 UD->setInvalidDecl(); 4008 return UD; 4009 } 4010 } 4011 4012 // C++0x N2914 [namespace.udecl]p6: 4013 // A using-declaration shall not name a namespace. 4014 if (R.getAsSingle<NamespaceDecl>()) { 4015 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 4016 << SS.getRange(); 4017 UD->setInvalidDecl(); 4018 return UD; 4019 } 4020 4021 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4022 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4023 BuildUsingShadowDecl(S, UD, *I); 4024 } 4025 4026 return UD; 4027} 4028 4029/// Checks that the given using declaration is not an invalid 4030/// redeclaration. Note that this is checking only for the using decl 4031/// itself, not for any ill-formedness among the UsingShadowDecls. 4032bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4033 bool isTypeName, 4034 const CXXScopeSpec &SS, 4035 SourceLocation NameLoc, 4036 const LookupResult &Prev) { 4037 // C++03 [namespace.udecl]p8: 4038 // C++0x [namespace.udecl]p10: 4039 // A using-declaration is a declaration and can therefore be used 4040 // repeatedly where (and only where) multiple declarations are 4041 // allowed. 4042 // 4043 // That's in non-member contexts. 4044 if (!CurContext->getRedeclContext()->isRecord()) 4045 return false; 4046 4047 NestedNameSpecifier *Qual 4048 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4049 4050 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4051 NamedDecl *D = *I; 4052 4053 bool DTypename; 4054 NestedNameSpecifier *DQual; 4055 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4056 DTypename = UD->isTypeName(); 4057 DQual = UD->getTargetNestedNameDecl(); 4058 } else if (UnresolvedUsingValueDecl *UD 4059 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4060 DTypename = false; 4061 DQual = UD->getTargetNestedNameSpecifier(); 4062 } else if (UnresolvedUsingTypenameDecl *UD 4063 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4064 DTypename = true; 4065 DQual = UD->getTargetNestedNameSpecifier(); 4066 } else continue; 4067 4068 // using decls differ if one says 'typename' and the other doesn't. 4069 // FIXME: non-dependent using decls? 4070 if (isTypeName != DTypename) continue; 4071 4072 // using decls differ if they name different scopes (but note that 4073 // template instantiation can cause this check to trigger when it 4074 // didn't before instantiation). 4075 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4076 Context.getCanonicalNestedNameSpecifier(DQual)) 4077 continue; 4078 4079 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4080 Diag(D->getLocation(), diag::note_using_decl) << 1; 4081 return true; 4082 } 4083 4084 return false; 4085} 4086 4087 4088/// Checks that the given nested-name qualifier used in a using decl 4089/// in the current context is appropriately related to the current 4090/// scope. If an error is found, diagnoses it and returns true. 4091bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4092 const CXXScopeSpec &SS, 4093 SourceLocation NameLoc) { 4094 DeclContext *NamedContext = computeDeclContext(SS); 4095 4096 if (!CurContext->isRecord()) { 4097 // C++03 [namespace.udecl]p3: 4098 // C++0x [namespace.udecl]p8: 4099 // A using-declaration for a class member shall be a member-declaration. 4100 4101 // If we weren't able to compute a valid scope, it must be a 4102 // dependent class scope. 4103 if (!NamedContext || NamedContext->isRecord()) { 4104 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4105 << SS.getRange(); 4106 return true; 4107 } 4108 4109 // Otherwise, everything is known to be fine. 4110 return false; 4111 } 4112 4113 // The current scope is a record. 4114 4115 // If the named context is dependent, we can't decide much. 4116 if (!NamedContext) { 4117 // FIXME: in C++0x, we can diagnose if we can prove that the 4118 // nested-name-specifier does not refer to a base class, which is 4119 // still possible in some cases. 4120 4121 // Otherwise we have to conservatively report that things might be 4122 // okay. 4123 return false; 4124 } 4125 4126 if (!NamedContext->isRecord()) { 4127 // Ideally this would point at the last name in the specifier, 4128 // but we don't have that level of source info. 4129 Diag(SS.getRange().getBegin(), 4130 diag::err_using_decl_nested_name_specifier_is_not_class) 4131 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4132 return true; 4133 } 4134 4135 if (getLangOptions().CPlusPlus0x) { 4136 // C++0x [namespace.udecl]p3: 4137 // In a using-declaration used as a member-declaration, the 4138 // nested-name-specifier shall name a base class of the class 4139 // being defined. 4140 4141 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4142 cast<CXXRecordDecl>(NamedContext))) { 4143 if (CurContext == NamedContext) { 4144 Diag(NameLoc, 4145 diag::err_using_decl_nested_name_specifier_is_current_class) 4146 << SS.getRange(); 4147 return true; 4148 } 4149 4150 Diag(SS.getRange().getBegin(), 4151 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4152 << (NestedNameSpecifier*) SS.getScopeRep() 4153 << cast<CXXRecordDecl>(CurContext) 4154 << SS.getRange(); 4155 return true; 4156 } 4157 4158 return false; 4159 } 4160 4161 // C++03 [namespace.udecl]p4: 4162 // A using-declaration used as a member-declaration shall refer 4163 // to a member of a base class of the class being defined [etc.]. 4164 4165 // Salient point: SS doesn't have to name a base class as long as 4166 // lookup only finds members from base classes. Therefore we can 4167 // diagnose here only if we can prove that that can't happen, 4168 // i.e. if the class hierarchies provably don't intersect. 4169 4170 // TODO: it would be nice if "definitely valid" results were cached 4171 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4172 // need to be repeated. 4173 4174 struct UserData { 4175 llvm::DenseSet<const CXXRecordDecl*> Bases; 4176 4177 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4178 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4179 Data->Bases.insert(Base); 4180 return true; 4181 } 4182 4183 bool hasDependentBases(const CXXRecordDecl *Class) { 4184 return !Class->forallBases(collect, this); 4185 } 4186 4187 /// Returns true if the base is dependent or is one of the 4188 /// accumulated base classes. 4189 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4190 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4191 return !Data->Bases.count(Base); 4192 } 4193 4194 bool mightShareBases(const CXXRecordDecl *Class) { 4195 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4196 } 4197 }; 4198 4199 UserData Data; 4200 4201 // Returns false if we find a dependent base. 4202 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4203 return false; 4204 4205 // Returns false if the class has a dependent base or if it or one 4206 // of its bases is present in the base set of the current context. 4207 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4208 return false; 4209 4210 Diag(SS.getRange().getBegin(), 4211 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4212 << (NestedNameSpecifier*) SS.getScopeRep() 4213 << cast<CXXRecordDecl>(CurContext) 4214 << SS.getRange(); 4215 4216 return true; 4217} 4218 4219Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4220 SourceLocation NamespaceLoc, 4221 SourceLocation AliasLoc, 4222 IdentifierInfo *Alias, 4223 CXXScopeSpec &SS, 4224 SourceLocation IdentLoc, 4225 IdentifierInfo *Ident) { 4226 4227 // Lookup the namespace name. 4228 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4229 LookupParsedName(R, S, &SS); 4230 4231 // Check if we have a previous declaration with the same name. 4232 NamedDecl *PrevDecl 4233 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4234 ForRedeclaration); 4235 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4236 PrevDecl = 0; 4237 4238 if (PrevDecl) { 4239 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4240 // We already have an alias with the same name that points to the same 4241 // namespace, so don't create a new one. 4242 // FIXME: At some point, we'll want to create the (redundant) 4243 // declaration to maintain better source information. 4244 if (!R.isAmbiguous() && !R.empty() && 4245 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4246 return 0; 4247 } 4248 4249 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4250 diag::err_redefinition_different_kind; 4251 Diag(AliasLoc, DiagID) << Alias; 4252 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4253 return 0; 4254 } 4255 4256 if (R.isAmbiguous()) 4257 return 0; 4258 4259 if (R.empty()) { 4260 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4261 CTC_NoKeywords, 0)) { 4262 if (R.getAsSingle<NamespaceDecl>() || 4263 R.getAsSingle<NamespaceAliasDecl>()) { 4264 if (DeclContext *DC = computeDeclContext(SS, false)) 4265 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4266 << Ident << DC << Corrected << SS.getRange() 4267 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4268 else 4269 Diag(IdentLoc, diag::err_using_directive_suggest) 4270 << Ident << Corrected 4271 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4272 4273 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4274 << Corrected; 4275 4276 Ident = Corrected.getAsIdentifierInfo(); 4277 } else { 4278 R.clear(); 4279 R.setLookupName(Ident); 4280 } 4281 } 4282 4283 if (R.empty()) { 4284 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4285 return 0; 4286 } 4287 } 4288 4289 NamespaceAliasDecl *AliasDecl = 4290 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4291 Alias, SS.getRange(), 4292 (NestedNameSpecifier *)SS.getScopeRep(), 4293 IdentLoc, R.getFoundDecl()); 4294 4295 PushOnScopeChains(AliasDecl, S); 4296 return AliasDecl; 4297} 4298 4299namespace { 4300 /// \brief Scoped object used to handle the state changes required in Sema 4301 /// to implicitly define the body of a C++ member function; 4302 class ImplicitlyDefinedFunctionScope { 4303 Sema &S; 4304 DeclContext *PreviousContext; 4305 4306 public: 4307 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4308 : S(S), PreviousContext(S.CurContext) 4309 { 4310 S.CurContext = Method; 4311 S.PushFunctionScope(); 4312 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4313 } 4314 4315 ~ImplicitlyDefinedFunctionScope() { 4316 S.PopExpressionEvaluationContext(); 4317 S.PopFunctionOrBlockScope(); 4318 S.CurContext = PreviousContext; 4319 } 4320 }; 4321} 4322 4323CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4324 CXXRecordDecl *ClassDecl) { 4325 // C++ [class.ctor]p5: 4326 // A default constructor for a class X is a constructor of class X 4327 // that can be called without an argument. If there is no 4328 // user-declared constructor for class X, a default constructor is 4329 // implicitly declared. An implicitly-declared default constructor 4330 // is an inline public member of its class. 4331 assert(!ClassDecl->hasUserDeclaredConstructor() && 4332 "Should not build implicit default constructor!"); 4333 4334 // C++ [except.spec]p14: 4335 // An implicitly declared special member function (Clause 12) shall have an 4336 // exception-specification. [...] 4337 ImplicitExceptionSpecification ExceptSpec(Context); 4338 4339 // Direct base-class destructors. 4340 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4341 BEnd = ClassDecl->bases_end(); 4342 B != BEnd; ++B) { 4343 if (B->isVirtual()) // Handled below. 4344 continue; 4345 4346 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4347 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4348 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4349 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4350 else if (CXXConstructorDecl *Constructor 4351 = BaseClassDecl->getDefaultConstructor()) 4352 ExceptSpec.CalledDecl(Constructor); 4353 } 4354 } 4355 4356 // Virtual base-class destructors. 4357 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4358 BEnd = ClassDecl->vbases_end(); 4359 B != BEnd; ++B) { 4360 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4361 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4362 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4363 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4364 else if (CXXConstructorDecl *Constructor 4365 = BaseClassDecl->getDefaultConstructor()) 4366 ExceptSpec.CalledDecl(Constructor); 4367 } 4368 } 4369 4370 // Field destructors. 4371 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4372 FEnd = ClassDecl->field_end(); 4373 F != FEnd; ++F) { 4374 if (const RecordType *RecordTy 4375 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4376 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4377 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4378 ExceptSpec.CalledDecl( 4379 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4380 else if (CXXConstructorDecl *Constructor 4381 = FieldClassDecl->getDefaultConstructor()) 4382 ExceptSpec.CalledDecl(Constructor); 4383 } 4384 } 4385 4386 4387 // Create the actual constructor declaration. 4388 CanQualType ClassType 4389 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4390 DeclarationName Name 4391 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4392 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4393 CXXConstructorDecl *DefaultCon 4394 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 4395 Context.getFunctionType(Context.VoidTy, 4396 0, 0, false, 0, 4397 ExceptSpec.hasExceptionSpecification(), 4398 ExceptSpec.hasAnyExceptionSpecification(), 4399 ExceptSpec.size(), 4400 ExceptSpec.data(), 4401 FunctionType::ExtInfo()), 4402 /*TInfo=*/0, 4403 /*isExplicit=*/false, 4404 /*isInline=*/true, 4405 /*isImplicitlyDeclared=*/true); 4406 DefaultCon->setAccess(AS_public); 4407 DefaultCon->setImplicit(); 4408 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4409 4410 // Note that we have declared this constructor. 4411 ClassDecl->setDeclaredDefaultConstructor(true); 4412 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4413 4414 if (Scope *S = getScopeForContext(ClassDecl)) 4415 PushOnScopeChains(DefaultCon, S, false); 4416 ClassDecl->addDecl(DefaultCon); 4417 4418 return DefaultCon; 4419} 4420 4421void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4422 CXXConstructorDecl *Constructor) { 4423 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4424 !Constructor->isUsed(false)) && 4425 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4426 4427 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4428 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4429 4430 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4431 ErrorTrap Trap(*this); 4432 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4433 Trap.hasErrorOccurred()) { 4434 Diag(CurrentLocation, diag::note_member_synthesized_at) 4435 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4436 Constructor->setInvalidDecl(); 4437 } else { 4438 Constructor->setUsed(); 4439 MarkVTableUsed(CurrentLocation, ClassDecl); 4440 } 4441} 4442 4443CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4444 // C++ [class.dtor]p2: 4445 // If a class has no user-declared destructor, a destructor is 4446 // declared implicitly. An implicitly-declared destructor is an 4447 // inline public member of its class. 4448 4449 // C++ [except.spec]p14: 4450 // An implicitly declared special member function (Clause 12) shall have 4451 // an exception-specification. 4452 ImplicitExceptionSpecification ExceptSpec(Context); 4453 4454 // Direct base-class destructors. 4455 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4456 BEnd = ClassDecl->bases_end(); 4457 B != BEnd; ++B) { 4458 if (B->isVirtual()) // Handled below. 4459 continue; 4460 4461 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4462 ExceptSpec.CalledDecl( 4463 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4464 } 4465 4466 // Virtual base-class destructors. 4467 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4468 BEnd = ClassDecl->vbases_end(); 4469 B != BEnd; ++B) { 4470 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4471 ExceptSpec.CalledDecl( 4472 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4473 } 4474 4475 // Field destructors. 4476 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4477 FEnd = ClassDecl->field_end(); 4478 F != FEnd; ++F) { 4479 if (const RecordType *RecordTy 4480 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4481 ExceptSpec.CalledDecl( 4482 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4483 } 4484 4485 // Create the actual destructor declaration. 4486 QualType Ty = Context.getFunctionType(Context.VoidTy, 4487 0, 0, false, 0, 4488 ExceptSpec.hasExceptionSpecification(), 4489 ExceptSpec.hasAnyExceptionSpecification(), 4490 ExceptSpec.size(), 4491 ExceptSpec.data(), 4492 FunctionType::ExtInfo()); 4493 4494 CanQualType ClassType 4495 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4496 DeclarationName Name 4497 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4498 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4499 CXXDestructorDecl *Destructor 4500 = CXXDestructorDecl::Create(Context, ClassDecl, NameInfo, Ty, 4501 /*isInline=*/true, 4502 /*isImplicitlyDeclared=*/true); 4503 Destructor->setAccess(AS_public); 4504 Destructor->setImplicit(); 4505 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4506 4507 // Note that we have declared this destructor. 4508 ClassDecl->setDeclaredDestructor(true); 4509 ++ASTContext::NumImplicitDestructorsDeclared; 4510 4511 // Introduce this destructor into its scope. 4512 if (Scope *S = getScopeForContext(ClassDecl)) 4513 PushOnScopeChains(Destructor, S, false); 4514 ClassDecl->addDecl(Destructor); 4515 4516 // This could be uniqued if it ever proves significant. 4517 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4518 4519 AddOverriddenMethods(ClassDecl, Destructor); 4520 4521 return Destructor; 4522} 4523 4524void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4525 CXXDestructorDecl *Destructor) { 4526 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4527 "DefineImplicitDestructor - call it for implicit default dtor"); 4528 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4529 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4530 4531 if (Destructor->isInvalidDecl()) 4532 return; 4533 4534 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4535 4536 ErrorTrap Trap(*this); 4537 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4538 Destructor->getParent()); 4539 4540 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4541 Diag(CurrentLocation, diag::note_member_synthesized_at) 4542 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4543 4544 Destructor->setInvalidDecl(); 4545 return; 4546 } 4547 4548 Destructor->setUsed(); 4549 MarkVTableUsed(CurrentLocation, ClassDecl); 4550} 4551 4552/// \brief Builds a statement that copies the given entity from \p From to 4553/// \c To. 4554/// 4555/// This routine is used to copy the members of a class with an 4556/// implicitly-declared copy assignment operator. When the entities being 4557/// copied are arrays, this routine builds for loops to copy them. 4558/// 4559/// \param S The Sema object used for type-checking. 4560/// 4561/// \param Loc The location where the implicit copy is being generated. 4562/// 4563/// \param T The type of the expressions being copied. Both expressions must 4564/// have this type. 4565/// 4566/// \param To The expression we are copying to. 4567/// 4568/// \param From The expression we are copying from. 4569/// 4570/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4571/// Otherwise, it's a non-static member subobject. 4572/// 4573/// \param Depth Internal parameter recording the depth of the recursion. 4574/// 4575/// \returns A statement or a loop that copies the expressions. 4576static StmtResult 4577BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4578 Expr *To, Expr *From, 4579 bool CopyingBaseSubobject, unsigned Depth = 0) { 4580 // C++0x [class.copy]p30: 4581 // Each subobject is assigned in the manner appropriate to its type: 4582 // 4583 // - if the subobject is of class type, the copy assignment operator 4584 // for the class is used (as if by explicit qualification; that is, 4585 // ignoring any possible virtual overriding functions in more derived 4586 // classes); 4587 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4588 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4589 4590 // Look for operator=. 4591 DeclarationName Name 4592 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4593 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4594 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4595 4596 // Filter out any result that isn't a copy-assignment operator. 4597 LookupResult::Filter F = OpLookup.makeFilter(); 4598 while (F.hasNext()) { 4599 NamedDecl *D = F.next(); 4600 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4601 if (Method->isCopyAssignmentOperator()) 4602 continue; 4603 4604 F.erase(); 4605 } 4606 F.done(); 4607 4608 // Suppress the protected check (C++ [class.protected]) for each of the 4609 // assignment operators we found. This strange dance is required when 4610 // we're assigning via a base classes's copy-assignment operator. To 4611 // ensure that we're getting the right base class subobject (without 4612 // ambiguities), we need to cast "this" to that subobject type; to 4613 // ensure that we don't go through the virtual call mechanism, we need 4614 // to qualify the operator= name with the base class (see below). However, 4615 // this means that if the base class has a protected copy assignment 4616 // operator, the protected member access check will fail. So, we 4617 // rewrite "protected" access to "public" access in this case, since we 4618 // know by construction that we're calling from a derived class. 4619 if (CopyingBaseSubobject) { 4620 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4621 L != LEnd; ++L) { 4622 if (L.getAccess() == AS_protected) 4623 L.setAccess(AS_public); 4624 } 4625 } 4626 4627 // Create the nested-name-specifier that will be used to qualify the 4628 // reference to operator=; this is required to suppress the virtual 4629 // call mechanism. 4630 CXXScopeSpec SS; 4631 SS.setRange(Loc); 4632 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4633 T.getTypePtr())); 4634 4635 // Create the reference to operator=. 4636 ExprResult OpEqualRef 4637 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 4638 /*FirstQualifierInScope=*/0, OpLookup, 4639 /*TemplateArgs=*/0, 4640 /*SuppressQualifierCheck=*/true); 4641 if (OpEqualRef.isInvalid()) 4642 return StmtError(); 4643 4644 // Build the call to the assignment operator. 4645 4646 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4647 OpEqualRef.takeAs<Expr>(), 4648 Loc, &From, 1, 0, Loc); 4649 if (Call.isInvalid()) 4650 return StmtError(); 4651 4652 return S.Owned(Call.takeAs<Stmt>()); 4653 } 4654 4655 // - if the subobject is of scalar type, the built-in assignment 4656 // operator is used. 4657 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4658 if (!ArrayTy) { 4659 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 4660 if (Assignment.isInvalid()) 4661 return StmtError(); 4662 4663 return S.Owned(Assignment.takeAs<Stmt>()); 4664 } 4665 4666 // - if the subobject is an array, each element is assigned, in the 4667 // manner appropriate to the element type; 4668 4669 // Construct a loop over the array bounds, e.g., 4670 // 4671 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4672 // 4673 // that will copy each of the array elements. 4674 QualType SizeType = S.Context.getSizeType(); 4675 4676 // Create the iteration variable. 4677 IdentifierInfo *IterationVarName = 0; 4678 { 4679 llvm::SmallString<8> Str; 4680 llvm::raw_svector_ostream OS(Str); 4681 OS << "__i" << Depth; 4682 IterationVarName = &S.Context.Idents.get(OS.str()); 4683 } 4684 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4685 IterationVarName, SizeType, 4686 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4687 SC_None, SC_None); 4688 4689 // Initialize the iteration variable to zero. 4690 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4691 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 4692 4693 // Create a reference to the iteration variable; we'll use this several 4694 // times throughout. 4695 Expr *IterationVarRef 4696 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4697 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4698 4699 // Create the DeclStmt that holds the iteration variable. 4700 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4701 4702 // Create the comparison against the array bound. 4703 llvm::APInt Upper = ArrayTy->getSize(); 4704 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4705 Expr *Comparison 4706 = new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4707 IntegerLiteral::Create(S.Context, 4708 Upper, SizeType, Loc), 4709 BO_NE, S.Context.BoolTy, Loc); 4710 4711 // Create the pre-increment of the iteration variable. 4712 Expr *Increment 4713 = new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4714 UO_PreInc, 4715 SizeType, Loc); 4716 4717 // Subscript the "from" and "to" expressions with the iteration variable. 4718 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 4719 IterationVarRef, Loc)); 4720 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 4721 IterationVarRef, Loc)); 4722 4723 // Build the copy for an individual element of the array. 4724 StmtResult Copy = BuildSingleCopyAssign(S, Loc, 4725 ArrayTy->getElementType(), 4726 To, From, 4727 CopyingBaseSubobject, Depth+1); 4728 if (Copy.isInvalid()) 4729 return StmtError(); 4730 4731 // Construct the loop that copies all elements of this array. 4732 return S.ActOnForStmt(Loc, Loc, InitStmt, 4733 S.MakeFullExpr(Comparison), 4734 0, S.MakeFullExpr(Increment), 4735 Loc, Copy.take()); 4736} 4737 4738/// \brief Determine whether the given class has a copy assignment operator 4739/// that accepts a const-qualified argument. 4740static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4741 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4742 4743 if (!Class->hasDeclaredCopyAssignment()) 4744 S.DeclareImplicitCopyAssignment(Class); 4745 4746 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4747 DeclarationName OpName 4748 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4749 4750 DeclContext::lookup_const_iterator Op, OpEnd; 4751 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4752 // C++ [class.copy]p9: 4753 // A user-declared copy assignment operator is a non-static non-template 4754 // member function of class X with exactly one parameter of type X, X&, 4755 // const X&, volatile X& or const volatile X&. 4756 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4757 if (!Method) 4758 continue; 4759 4760 if (Method->isStatic()) 4761 continue; 4762 if (Method->getPrimaryTemplate()) 4763 continue; 4764 const FunctionProtoType *FnType = 4765 Method->getType()->getAs<FunctionProtoType>(); 4766 assert(FnType && "Overloaded operator has no prototype."); 4767 // Don't assert on this; an invalid decl might have been left in the AST. 4768 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4769 continue; 4770 bool AcceptsConst = true; 4771 QualType ArgType = FnType->getArgType(0); 4772 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4773 ArgType = Ref->getPointeeType(); 4774 // Is it a non-const lvalue reference? 4775 if (!ArgType.isConstQualified()) 4776 AcceptsConst = false; 4777 } 4778 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4779 continue; 4780 4781 // We have a single argument of type cv X or cv X&, i.e. we've found the 4782 // copy assignment operator. Return whether it accepts const arguments. 4783 return AcceptsConst; 4784 } 4785 assert(Class->isInvalidDecl() && 4786 "No copy assignment operator declared in valid code."); 4787 return false; 4788} 4789 4790CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4791 // Note: The following rules are largely analoguous to the copy 4792 // constructor rules. Note that virtual bases are not taken into account 4793 // for determining the argument type of the operator. Note also that 4794 // operators taking an object instead of a reference are allowed. 4795 4796 4797 // C++ [class.copy]p10: 4798 // If the class definition does not explicitly declare a copy 4799 // assignment operator, one is declared implicitly. 4800 // The implicitly-defined copy assignment operator for a class X 4801 // will have the form 4802 // 4803 // X& X::operator=(const X&) 4804 // 4805 // if 4806 bool HasConstCopyAssignment = true; 4807 4808 // -- each direct base class B of X has a copy assignment operator 4809 // whose parameter is of type const B&, const volatile B& or B, 4810 // and 4811 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4812 BaseEnd = ClassDecl->bases_end(); 4813 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4814 assert(!Base->getType()->isDependentType() && 4815 "Cannot generate implicit members for class with dependent bases."); 4816 const CXXRecordDecl *BaseClassDecl 4817 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4818 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4819 } 4820 4821 // -- for all the nonstatic data members of X that are of a class 4822 // type M (or array thereof), each such class type has a copy 4823 // assignment operator whose parameter is of type const M&, 4824 // const volatile M& or M. 4825 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4826 FieldEnd = ClassDecl->field_end(); 4827 HasConstCopyAssignment && Field != FieldEnd; 4828 ++Field) { 4829 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4830 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4831 const CXXRecordDecl *FieldClassDecl 4832 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4833 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4834 } 4835 } 4836 4837 // Otherwise, the implicitly declared copy assignment operator will 4838 // have the form 4839 // 4840 // X& X::operator=(X&) 4841 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4842 QualType RetType = Context.getLValueReferenceType(ArgType); 4843 if (HasConstCopyAssignment) 4844 ArgType = ArgType.withConst(); 4845 ArgType = Context.getLValueReferenceType(ArgType); 4846 4847 // C++ [except.spec]p14: 4848 // An implicitly declared special member function (Clause 12) shall have an 4849 // exception-specification. [...] 4850 ImplicitExceptionSpecification ExceptSpec(Context); 4851 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4852 BaseEnd = ClassDecl->bases_end(); 4853 Base != BaseEnd; ++Base) { 4854 CXXRecordDecl *BaseClassDecl 4855 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4856 4857 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4858 DeclareImplicitCopyAssignment(BaseClassDecl); 4859 4860 if (CXXMethodDecl *CopyAssign 4861 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4862 ExceptSpec.CalledDecl(CopyAssign); 4863 } 4864 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4865 FieldEnd = ClassDecl->field_end(); 4866 Field != FieldEnd; 4867 ++Field) { 4868 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4869 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4870 CXXRecordDecl *FieldClassDecl 4871 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4872 4873 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 4874 DeclareImplicitCopyAssignment(FieldClassDecl); 4875 4876 if (CXXMethodDecl *CopyAssign 4877 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4878 ExceptSpec.CalledDecl(CopyAssign); 4879 } 4880 } 4881 4882 // An implicitly-declared copy assignment operator is an inline public 4883 // member of its class. 4884 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4885 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4886 CXXMethodDecl *CopyAssignment 4887 = CXXMethodDecl::Create(Context, ClassDecl, NameInfo, 4888 Context.getFunctionType(RetType, &ArgType, 1, 4889 false, 0, 4890 ExceptSpec.hasExceptionSpecification(), 4891 ExceptSpec.hasAnyExceptionSpecification(), 4892 ExceptSpec.size(), 4893 ExceptSpec.data(), 4894 FunctionType::ExtInfo()), 4895 /*TInfo=*/0, /*isStatic=*/false, 4896 /*StorageClassAsWritten=*/SC_None, 4897 /*isInline=*/true); 4898 CopyAssignment->setAccess(AS_public); 4899 CopyAssignment->setImplicit(); 4900 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4901 CopyAssignment->setCopyAssignment(true); 4902 4903 // Add the parameter to the operator. 4904 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4905 ClassDecl->getLocation(), 4906 /*Id=*/0, 4907 ArgType, /*TInfo=*/0, 4908 SC_None, 4909 SC_None, 0); 4910 CopyAssignment->setParams(&FromParam, 1); 4911 4912 // Note that we have added this copy-assignment operator. 4913 ClassDecl->setDeclaredCopyAssignment(true); 4914 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 4915 4916 if (Scope *S = getScopeForContext(ClassDecl)) 4917 PushOnScopeChains(CopyAssignment, S, false); 4918 ClassDecl->addDecl(CopyAssignment); 4919 4920 AddOverriddenMethods(ClassDecl, CopyAssignment); 4921 return CopyAssignment; 4922} 4923 4924void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4925 CXXMethodDecl *CopyAssignOperator) { 4926 assert((CopyAssignOperator->isImplicit() && 4927 CopyAssignOperator->isOverloadedOperator() && 4928 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4929 !CopyAssignOperator->isUsed(false)) && 4930 "DefineImplicitCopyAssignment called for wrong function"); 4931 4932 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4933 4934 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4935 CopyAssignOperator->setInvalidDecl(); 4936 return; 4937 } 4938 4939 CopyAssignOperator->setUsed(); 4940 4941 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4942 ErrorTrap Trap(*this); 4943 4944 // C++0x [class.copy]p30: 4945 // The implicitly-defined or explicitly-defaulted copy assignment operator 4946 // for a non-union class X performs memberwise copy assignment of its 4947 // subobjects. The direct base classes of X are assigned first, in the 4948 // order of their declaration in the base-specifier-list, and then the 4949 // immediate non-static data members of X are assigned, in the order in 4950 // which they were declared in the class definition. 4951 4952 // The statements that form the synthesized function body. 4953 ASTOwningVector<Stmt*> Statements(*this); 4954 4955 // The parameter for the "other" object, which we are copying from. 4956 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4957 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4958 QualType OtherRefType = Other->getType(); 4959 if (const LValueReferenceType *OtherRef 4960 = OtherRefType->getAs<LValueReferenceType>()) { 4961 OtherRefType = OtherRef->getPointeeType(); 4962 OtherQuals = OtherRefType.getQualifiers(); 4963 } 4964 4965 // Our location for everything implicitly-generated. 4966 SourceLocation Loc = CopyAssignOperator->getLocation(); 4967 4968 // Construct a reference to the "other" object. We'll be using this 4969 // throughout the generated ASTs. 4970 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4971 assert(OtherRef && "Reference to parameter cannot fail!"); 4972 4973 // Construct the "this" pointer. We'll be using this throughout the generated 4974 // ASTs. 4975 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4976 assert(This && "Reference to this cannot fail!"); 4977 4978 // Assign base classes. 4979 bool Invalid = false; 4980 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4981 E = ClassDecl->bases_end(); Base != E; ++Base) { 4982 // Form the assignment: 4983 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4984 QualType BaseType = Base->getType().getUnqualifiedType(); 4985 CXXRecordDecl *BaseClassDecl = 0; 4986 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4987 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4988 else { 4989 Invalid = true; 4990 continue; 4991 } 4992 4993 CXXCastPath BasePath; 4994 BasePath.push_back(Base); 4995 4996 // Construct the "from" expression, which is an implicit cast to the 4997 // appropriately-qualified base type. 4998 Expr *From = OtherRef->Retain(); 4999 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 5000 CK_UncheckedDerivedToBase, 5001 VK_LValue, &BasePath); 5002 5003 // Dereference "this". 5004 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5005 5006 // Implicitly cast "this" to the appropriately-qualified base type. 5007 Expr *ToE = To.takeAs<Expr>(); 5008 ImpCastExprToType(ToE, 5009 Context.getCVRQualifiedType(BaseType, 5010 CopyAssignOperator->getTypeQualifiers()), 5011 CK_UncheckedDerivedToBase, 5012 VK_LValue, &BasePath); 5013 To = Owned(ToE); 5014 5015 // Build the copy. 5016 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 5017 To.get(), From, 5018 /*CopyingBaseSubobject=*/true); 5019 if (Copy.isInvalid()) { 5020 Diag(CurrentLocation, diag::note_member_synthesized_at) 5021 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5022 CopyAssignOperator->setInvalidDecl(); 5023 return; 5024 } 5025 5026 // Success! Record the copy. 5027 Statements.push_back(Copy.takeAs<Expr>()); 5028 } 5029 5030 // \brief Reference to the __builtin_memcpy function. 5031 Expr *BuiltinMemCpyRef = 0; 5032 // \brief Reference to the __builtin_objc_memmove_collectable function. 5033 Expr *CollectableMemCpyRef = 0; 5034 5035 // Assign non-static members. 5036 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5037 FieldEnd = ClassDecl->field_end(); 5038 Field != FieldEnd; ++Field) { 5039 // Check for members of reference type; we can't copy those. 5040 if (Field->getType()->isReferenceType()) { 5041 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5042 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5043 Diag(Field->getLocation(), diag::note_declared_at); 5044 Diag(CurrentLocation, diag::note_member_synthesized_at) 5045 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5046 Invalid = true; 5047 continue; 5048 } 5049 5050 // Check for members of const-qualified, non-class type. 5051 QualType BaseType = Context.getBaseElementType(Field->getType()); 5052 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5053 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5054 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5055 Diag(Field->getLocation(), diag::note_declared_at); 5056 Diag(CurrentLocation, diag::note_member_synthesized_at) 5057 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5058 Invalid = true; 5059 continue; 5060 } 5061 5062 QualType FieldType = Field->getType().getNonReferenceType(); 5063 if (FieldType->isIncompleteArrayType()) { 5064 assert(ClassDecl->hasFlexibleArrayMember() && 5065 "Incomplete array type is not valid"); 5066 continue; 5067 } 5068 5069 // Build references to the field in the object we're copying from and to. 5070 CXXScopeSpec SS; // Intentionally empty 5071 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5072 LookupMemberName); 5073 MemberLookup.addDecl(*Field); 5074 MemberLookup.resolveKind(); 5075 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5076 Loc, /*IsArrow=*/false, 5077 SS, 0, MemberLookup, 0); 5078 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5079 Loc, /*IsArrow=*/true, 5080 SS, 0, MemberLookup, 0); 5081 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5082 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5083 5084 // If the field should be copied with __builtin_memcpy rather than via 5085 // explicit assignments, do so. This optimization only applies for arrays 5086 // of scalars and arrays of class type with trivial copy-assignment 5087 // operators. 5088 if (FieldType->isArrayType() && 5089 (!BaseType->isRecordType() || 5090 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5091 ->hasTrivialCopyAssignment())) { 5092 // Compute the size of the memory buffer to be copied. 5093 QualType SizeType = Context.getSizeType(); 5094 llvm::APInt Size(Context.getTypeSize(SizeType), 5095 Context.getTypeSizeInChars(BaseType).getQuantity()); 5096 for (const ConstantArrayType *Array 5097 = Context.getAsConstantArrayType(FieldType); 5098 Array; 5099 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5100 llvm::APInt ArraySize = Array->getSize(); 5101 ArraySize.zextOrTrunc(Size.getBitWidth()); 5102 Size *= ArraySize; 5103 } 5104 5105 // Take the address of the field references for "from" and "to". 5106 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5107 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5108 5109 bool NeedsCollectableMemCpy = 5110 (BaseType->isRecordType() && 5111 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5112 5113 if (NeedsCollectableMemCpy) { 5114 if (!CollectableMemCpyRef) { 5115 // Create a reference to the __builtin_objc_memmove_collectable function. 5116 LookupResult R(*this, 5117 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5118 Loc, LookupOrdinaryName); 5119 LookupName(R, TUScope, true); 5120 5121 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5122 if (!CollectableMemCpy) { 5123 // Something went horribly wrong earlier, and we will have 5124 // complained about it. 5125 Invalid = true; 5126 continue; 5127 } 5128 5129 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5130 CollectableMemCpy->getType(), 5131 Loc, 0).takeAs<Expr>(); 5132 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5133 } 5134 } 5135 // Create a reference to the __builtin_memcpy builtin function. 5136 else if (!BuiltinMemCpyRef) { 5137 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5138 LookupOrdinaryName); 5139 LookupName(R, TUScope, true); 5140 5141 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5142 if (!BuiltinMemCpy) { 5143 // Something went horribly wrong earlier, and we will have complained 5144 // about it. 5145 Invalid = true; 5146 continue; 5147 } 5148 5149 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5150 BuiltinMemCpy->getType(), 5151 Loc, 0).takeAs<Expr>(); 5152 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5153 } 5154 5155 ASTOwningVector<Expr*> CallArgs(*this); 5156 CallArgs.push_back(To.takeAs<Expr>()); 5157 CallArgs.push_back(From.takeAs<Expr>()); 5158 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5159 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 5160 Commas.push_back(Loc); 5161 Commas.push_back(Loc); 5162 ExprResult Call = ExprError(); 5163 if (NeedsCollectableMemCpy) 5164 Call = ActOnCallExpr(/*Scope=*/0, 5165 CollectableMemCpyRef, 5166 Loc, move_arg(CallArgs), 5167 Commas.data(), Loc); 5168 else 5169 Call = ActOnCallExpr(/*Scope=*/0, 5170 BuiltinMemCpyRef, 5171 Loc, move_arg(CallArgs), 5172 Commas.data(), Loc); 5173 5174 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5175 Statements.push_back(Call.takeAs<Expr>()); 5176 continue; 5177 } 5178 5179 // Build the copy of this field. 5180 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5181 To.get(), From.get(), 5182 /*CopyingBaseSubobject=*/false); 5183 if (Copy.isInvalid()) { 5184 Diag(CurrentLocation, diag::note_member_synthesized_at) 5185 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5186 CopyAssignOperator->setInvalidDecl(); 5187 return; 5188 } 5189 5190 // Success! Record the copy. 5191 Statements.push_back(Copy.takeAs<Stmt>()); 5192 } 5193 5194 if (!Invalid) { 5195 // Add a "return *this;" 5196 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5197 5198 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5199 if (Return.isInvalid()) 5200 Invalid = true; 5201 else { 5202 Statements.push_back(Return.takeAs<Stmt>()); 5203 5204 if (Trap.hasErrorOccurred()) { 5205 Diag(CurrentLocation, diag::note_member_synthesized_at) 5206 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5207 Invalid = true; 5208 } 5209 } 5210 } 5211 5212 if (Invalid) { 5213 CopyAssignOperator->setInvalidDecl(); 5214 return; 5215 } 5216 5217 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5218 /*isStmtExpr=*/false); 5219 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5220 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5221} 5222 5223CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5224 CXXRecordDecl *ClassDecl) { 5225 // C++ [class.copy]p4: 5226 // If the class definition does not explicitly declare a copy 5227 // constructor, one is declared implicitly. 5228 5229 // C++ [class.copy]p5: 5230 // The implicitly-declared copy constructor for a class X will 5231 // have the form 5232 // 5233 // X::X(const X&) 5234 // 5235 // if 5236 bool HasConstCopyConstructor = true; 5237 5238 // -- each direct or virtual base class B of X has a copy 5239 // constructor whose first parameter is of type const B& or 5240 // const volatile B&, and 5241 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5242 BaseEnd = ClassDecl->bases_end(); 5243 HasConstCopyConstructor && Base != BaseEnd; 5244 ++Base) { 5245 // Virtual bases are handled below. 5246 if (Base->isVirtual()) 5247 continue; 5248 5249 CXXRecordDecl *BaseClassDecl 5250 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5251 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5252 DeclareImplicitCopyConstructor(BaseClassDecl); 5253 5254 HasConstCopyConstructor 5255 = BaseClassDecl->hasConstCopyConstructor(Context); 5256 } 5257 5258 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5259 BaseEnd = ClassDecl->vbases_end(); 5260 HasConstCopyConstructor && Base != BaseEnd; 5261 ++Base) { 5262 CXXRecordDecl *BaseClassDecl 5263 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5264 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5265 DeclareImplicitCopyConstructor(BaseClassDecl); 5266 5267 HasConstCopyConstructor 5268 = BaseClassDecl->hasConstCopyConstructor(Context); 5269 } 5270 5271 // -- for all the nonstatic data members of X that are of a 5272 // class type M (or array thereof), each such class type 5273 // has a copy constructor whose first parameter is of type 5274 // const M& or const volatile M&. 5275 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5276 FieldEnd = ClassDecl->field_end(); 5277 HasConstCopyConstructor && Field != FieldEnd; 5278 ++Field) { 5279 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5280 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5281 CXXRecordDecl *FieldClassDecl 5282 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5283 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5284 DeclareImplicitCopyConstructor(FieldClassDecl); 5285 5286 HasConstCopyConstructor 5287 = FieldClassDecl->hasConstCopyConstructor(Context); 5288 } 5289 } 5290 5291 // Otherwise, the implicitly declared copy constructor will have 5292 // the form 5293 // 5294 // X::X(X&) 5295 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5296 QualType ArgType = ClassType; 5297 if (HasConstCopyConstructor) 5298 ArgType = ArgType.withConst(); 5299 ArgType = Context.getLValueReferenceType(ArgType); 5300 5301 // C++ [except.spec]p14: 5302 // An implicitly declared special member function (Clause 12) shall have an 5303 // exception-specification. [...] 5304 ImplicitExceptionSpecification ExceptSpec(Context); 5305 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5306 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5307 BaseEnd = ClassDecl->bases_end(); 5308 Base != BaseEnd; 5309 ++Base) { 5310 // Virtual bases are handled below. 5311 if (Base->isVirtual()) 5312 continue; 5313 5314 CXXRecordDecl *BaseClassDecl 5315 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5316 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5317 DeclareImplicitCopyConstructor(BaseClassDecl); 5318 5319 if (CXXConstructorDecl *CopyConstructor 5320 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5321 ExceptSpec.CalledDecl(CopyConstructor); 5322 } 5323 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5324 BaseEnd = ClassDecl->vbases_end(); 5325 Base != BaseEnd; 5326 ++Base) { 5327 CXXRecordDecl *BaseClassDecl 5328 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5329 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5330 DeclareImplicitCopyConstructor(BaseClassDecl); 5331 5332 if (CXXConstructorDecl *CopyConstructor 5333 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5334 ExceptSpec.CalledDecl(CopyConstructor); 5335 } 5336 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5337 FieldEnd = ClassDecl->field_end(); 5338 Field != FieldEnd; 5339 ++Field) { 5340 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5341 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5342 CXXRecordDecl *FieldClassDecl 5343 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5344 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5345 DeclareImplicitCopyConstructor(FieldClassDecl); 5346 5347 if (CXXConstructorDecl *CopyConstructor 5348 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5349 ExceptSpec.CalledDecl(CopyConstructor); 5350 } 5351 } 5352 5353 // An implicitly-declared copy constructor is an inline public 5354 // member of its class. 5355 DeclarationName Name 5356 = Context.DeclarationNames.getCXXConstructorName( 5357 Context.getCanonicalType(ClassType)); 5358 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5359 CXXConstructorDecl *CopyConstructor 5360 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 5361 Context.getFunctionType(Context.VoidTy, 5362 &ArgType, 1, 5363 false, 0, 5364 ExceptSpec.hasExceptionSpecification(), 5365 ExceptSpec.hasAnyExceptionSpecification(), 5366 ExceptSpec.size(), 5367 ExceptSpec.data(), 5368 FunctionType::ExtInfo()), 5369 /*TInfo=*/0, 5370 /*isExplicit=*/false, 5371 /*isInline=*/true, 5372 /*isImplicitlyDeclared=*/true); 5373 CopyConstructor->setAccess(AS_public); 5374 CopyConstructor->setImplicit(); 5375 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5376 5377 // Note that we have declared this constructor. 5378 ClassDecl->setDeclaredCopyConstructor(true); 5379 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5380 5381 // Add the parameter to the constructor. 5382 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5383 ClassDecl->getLocation(), 5384 /*IdentifierInfo=*/0, 5385 ArgType, /*TInfo=*/0, 5386 SC_None, 5387 SC_None, 0); 5388 CopyConstructor->setParams(&FromParam, 1); 5389 if (Scope *S = getScopeForContext(ClassDecl)) 5390 PushOnScopeChains(CopyConstructor, S, false); 5391 ClassDecl->addDecl(CopyConstructor); 5392 5393 return CopyConstructor; 5394} 5395 5396void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5397 CXXConstructorDecl *CopyConstructor, 5398 unsigned TypeQuals) { 5399 assert((CopyConstructor->isImplicit() && 5400 CopyConstructor->isCopyConstructor(TypeQuals) && 5401 !CopyConstructor->isUsed(false)) && 5402 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5403 5404 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5405 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5406 5407 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5408 ErrorTrap Trap(*this); 5409 5410 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5411 Trap.hasErrorOccurred()) { 5412 Diag(CurrentLocation, diag::note_member_synthesized_at) 5413 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5414 CopyConstructor->setInvalidDecl(); 5415 } else { 5416 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5417 CopyConstructor->getLocation(), 5418 MultiStmtArg(*this, 0, 0), 5419 /*isStmtExpr=*/false) 5420 .takeAs<Stmt>()); 5421 } 5422 5423 CopyConstructor->setUsed(); 5424} 5425 5426ExprResult 5427Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5428 CXXConstructorDecl *Constructor, 5429 MultiExprArg ExprArgs, 5430 bool RequiresZeroInit, 5431 unsigned ConstructKind) { 5432 bool Elidable = false; 5433 5434 // C++0x [class.copy]p34: 5435 // When certain criteria are met, an implementation is allowed to 5436 // omit the copy/move construction of a class object, even if the 5437 // copy/move constructor and/or destructor for the object have 5438 // side effects. [...] 5439 // - when a temporary class object that has not been bound to a 5440 // reference (12.2) would be copied/moved to a class object 5441 // with the same cv-unqualified type, the copy/move operation 5442 // can be omitted by constructing the temporary object 5443 // directly into the target of the omitted copy/move 5444 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5445 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5446 Elidable = SubExpr->isTemporaryObject() && 5447 ConstructKind == CXXConstructExpr::CK_Complete && 5448 Context.hasSameUnqualifiedType(SubExpr->getType(), 5449 Context.getTypeDeclType(Constructor->getParent())); 5450 } 5451 5452 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5453 Elidable, move(ExprArgs), RequiresZeroInit, 5454 ConstructKind); 5455} 5456 5457/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5458/// including handling of its default argument expressions. 5459ExprResult 5460Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5461 CXXConstructorDecl *Constructor, bool Elidable, 5462 MultiExprArg ExprArgs, 5463 bool RequiresZeroInit, 5464 unsigned ConstructKind) { 5465 unsigned NumExprs = ExprArgs.size(); 5466 Expr **Exprs = (Expr **)ExprArgs.release(); 5467 5468 MarkDeclarationReferenced(ConstructLoc, Constructor); 5469 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5470 Constructor, Elidable, Exprs, NumExprs, 5471 RequiresZeroInit, 5472 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind))); 5473} 5474 5475bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5476 CXXConstructorDecl *Constructor, 5477 MultiExprArg Exprs) { 5478 ExprResult TempResult = 5479 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5480 move(Exprs), false, CXXConstructExpr::CK_Complete); 5481 if (TempResult.isInvalid()) 5482 return true; 5483 5484 Expr *Temp = TempResult.takeAs<Expr>(); 5485 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5486 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 5487 VD->setInit(Temp); 5488 5489 return false; 5490} 5491 5492void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5493 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5494 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5495 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5496 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5497 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5498 CheckDestructorAccess(VD->getLocation(), Destructor, 5499 PDiag(diag::err_access_dtor_var) 5500 << VD->getDeclName() 5501 << VD->getType()); 5502 5503 if (!VD->isInvalidDecl() && VD->hasGlobalStorage()) 5504 Diag(VD->getLocation(), diag::warn_global_destructor); 5505 } 5506} 5507 5508/// AddCXXDirectInitializerToDecl - This action is called immediately after 5509/// ActOnDeclarator, when a C++ direct initializer is present. 5510/// e.g: "int x(1);" 5511void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 5512 SourceLocation LParenLoc, 5513 MultiExprArg Exprs, 5514 SourceLocation *CommaLocs, 5515 SourceLocation RParenLoc) { 5516 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5517 5518 // If there is no declaration, there was an error parsing it. Just ignore 5519 // the initializer. 5520 if (RealDecl == 0) 5521 return; 5522 5523 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5524 if (!VDecl) { 5525 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5526 RealDecl->setInvalidDecl(); 5527 return; 5528 } 5529 5530 // We will represent direct-initialization similarly to copy-initialization: 5531 // int x(1); -as-> int x = 1; 5532 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5533 // 5534 // Clients that want to distinguish between the two forms, can check for 5535 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5536 // A major benefit is that clients that don't particularly care about which 5537 // exactly form was it (like the CodeGen) can handle both cases without 5538 // special case code. 5539 5540 // C++ 8.5p11: 5541 // The form of initialization (using parentheses or '=') is generally 5542 // insignificant, but does matter when the entity being initialized has a 5543 // class type. 5544 5545 if (!VDecl->getType()->isDependentType() && 5546 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5547 diag::err_typecheck_decl_incomplete_type)) { 5548 VDecl->setInvalidDecl(); 5549 return; 5550 } 5551 5552 // The variable can not have an abstract class type. 5553 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5554 diag::err_abstract_type_in_decl, 5555 AbstractVariableType)) 5556 VDecl->setInvalidDecl(); 5557 5558 const VarDecl *Def; 5559 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5560 Diag(VDecl->getLocation(), diag::err_redefinition) 5561 << VDecl->getDeclName(); 5562 Diag(Def->getLocation(), diag::note_previous_definition); 5563 VDecl->setInvalidDecl(); 5564 return; 5565 } 5566 5567 // C++ [class.static.data]p4 5568 // If a static data member is of const integral or const 5569 // enumeration type, its declaration in the class definition can 5570 // specify a constant-initializer which shall be an integral 5571 // constant expression (5.19). In that case, the member can appear 5572 // in integral constant expressions. The member shall still be 5573 // defined in a namespace scope if it is used in the program and the 5574 // namespace scope definition shall not contain an initializer. 5575 // 5576 // We already performed a redefinition check above, but for static 5577 // data members we also need to check whether there was an in-class 5578 // declaration with an initializer. 5579 const VarDecl* PrevInit = 0; 5580 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5581 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5582 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5583 return; 5584 } 5585 5586 // If either the declaration has a dependent type or if any of the 5587 // expressions is type-dependent, we represent the initialization 5588 // via a ParenListExpr for later use during template instantiation. 5589 if (VDecl->getType()->isDependentType() || 5590 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5591 // Let clients know that initialization was done with a direct initializer. 5592 VDecl->setCXXDirectInitializer(true); 5593 5594 // Store the initialization expressions as a ParenListExpr. 5595 unsigned NumExprs = Exprs.size(); 5596 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5597 (Expr **)Exprs.release(), 5598 NumExprs, RParenLoc)); 5599 return; 5600 } 5601 5602 // Capture the variable that is being initialized and the style of 5603 // initialization. 5604 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5605 5606 // FIXME: Poor source location information. 5607 InitializationKind Kind 5608 = InitializationKind::CreateDirect(VDecl->getLocation(), 5609 LParenLoc, RParenLoc); 5610 5611 InitializationSequence InitSeq(*this, Entity, Kind, 5612 Exprs.get(), Exprs.size()); 5613 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5614 if (Result.isInvalid()) { 5615 VDecl->setInvalidDecl(); 5616 return; 5617 } 5618 5619 Result = MaybeCreateCXXExprWithTemporaries(Result.get()); 5620 VDecl->setInit(Result.takeAs<Expr>()); 5621 VDecl->setCXXDirectInitializer(true); 5622 5623 if (!VDecl->isInvalidDecl() && 5624 !VDecl->getDeclContext()->isDependentContext() && 5625 VDecl->hasGlobalStorage() && 5626 !VDecl->getInit()->isConstantInitializer(Context, 5627 VDecl->getType()->isReferenceType())) 5628 Diag(VDecl->getLocation(), diag::warn_global_constructor) 5629 << VDecl->getInit()->getSourceRange(); 5630 5631 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5632 FinalizeVarWithDestructor(VDecl, Record); 5633} 5634 5635/// \brief Given a constructor and the set of arguments provided for the 5636/// constructor, convert the arguments and add any required default arguments 5637/// to form a proper call to this constructor. 5638/// 5639/// \returns true if an error occurred, false otherwise. 5640bool 5641Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5642 MultiExprArg ArgsPtr, 5643 SourceLocation Loc, 5644 ASTOwningVector<Expr*> &ConvertedArgs) { 5645 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5646 unsigned NumArgs = ArgsPtr.size(); 5647 Expr **Args = (Expr **)ArgsPtr.get(); 5648 5649 const FunctionProtoType *Proto 5650 = Constructor->getType()->getAs<FunctionProtoType>(); 5651 assert(Proto && "Constructor without a prototype?"); 5652 unsigned NumArgsInProto = Proto->getNumArgs(); 5653 5654 // If too few arguments are available, we'll fill in the rest with defaults. 5655 if (NumArgs < NumArgsInProto) 5656 ConvertedArgs.reserve(NumArgsInProto); 5657 else 5658 ConvertedArgs.reserve(NumArgs); 5659 5660 VariadicCallType CallType = 5661 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5662 llvm::SmallVector<Expr *, 8> AllArgs; 5663 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5664 Proto, 0, Args, NumArgs, AllArgs, 5665 CallType); 5666 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5667 ConvertedArgs.push_back(AllArgs[i]); 5668 return Invalid; 5669} 5670 5671static inline bool 5672CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5673 const FunctionDecl *FnDecl) { 5674 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 5675 if (isa<NamespaceDecl>(DC)) { 5676 return SemaRef.Diag(FnDecl->getLocation(), 5677 diag::err_operator_new_delete_declared_in_namespace) 5678 << FnDecl->getDeclName(); 5679 } 5680 5681 if (isa<TranslationUnitDecl>(DC) && 5682 FnDecl->getStorageClass() == SC_Static) { 5683 return SemaRef.Diag(FnDecl->getLocation(), 5684 diag::err_operator_new_delete_declared_static) 5685 << FnDecl->getDeclName(); 5686 } 5687 5688 return false; 5689} 5690 5691static inline bool 5692CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5693 CanQualType ExpectedResultType, 5694 CanQualType ExpectedFirstParamType, 5695 unsigned DependentParamTypeDiag, 5696 unsigned InvalidParamTypeDiag) { 5697 QualType ResultType = 5698 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5699 5700 // Check that the result type is not dependent. 5701 if (ResultType->isDependentType()) 5702 return SemaRef.Diag(FnDecl->getLocation(), 5703 diag::err_operator_new_delete_dependent_result_type) 5704 << FnDecl->getDeclName() << ExpectedResultType; 5705 5706 // Check that the result type is what we expect. 5707 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5708 return SemaRef.Diag(FnDecl->getLocation(), 5709 diag::err_operator_new_delete_invalid_result_type) 5710 << FnDecl->getDeclName() << ExpectedResultType; 5711 5712 // A function template must have at least 2 parameters. 5713 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5714 return SemaRef.Diag(FnDecl->getLocation(), 5715 diag::err_operator_new_delete_template_too_few_parameters) 5716 << FnDecl->getDeclName(); 5717 5718 // The function decl must have at least 1 parameter. 5719 if (FnDecl->getNumParams() == 0) 5720 return SemaRef.Diag(FnDecl->getLocation(), 5721 diag::err_operator_new_delete_too_few_parameters) 5722 << FnDecl->getDeclName(); 5723 5724 // Check the the first parameter type is not dependent. 5725 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5726 if (FirstParamType->isDependentType()) 5727 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5728 << FnDecl->getDeclName() << ExpectedFirstParamType; 5729 5730 // Check that the first parameter type is what we expect. 5731 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5732 ExpectedFirstParamType) 5733 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5734 << FnDecl->getDeclName() << ExpectedFirstParamType; 5735 5736 return false; 5737} 5738 5739static bool 5740CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5741 // C++ [basic.stc.dynamic.allocation]p1: 5742 // A program is ill-formed if an allocation function is declared in a 5743 // namespace scope other than global scope or declared static in global 5744 // scope. 5745 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5746 return true; 5747 5748 CanQualType SizeTy = 5749 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5750 5751 // C++ [basic.stc.dynamic.allocation]p1: 5752 // The return type shall be void*. The first parameter shall have type 5753 // std::size_t. 5754 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5755 SizeTy, 5756 diag::err_operator_new_dependent_param_type, 5757 diag::err_operator_new_param_type)) 5758 return true; 5759 5760 // C++ [basic.stc.dynamic.allocation]p1: 5761 // The first parameter shall not have an associated default argument. 5762 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5763 return SemaRef.Diag(FnDecl->getLocation(), 5764 diag::err_operator_new_default_arg) 5765 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5766 5767 return false; 5768} 5769 5770static bool 5771CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5772 // C++ [basic.stc.dynamic.deallocation]p1: 5773 // A program is ill-formed if deallocation functions are declared in a 5774 // namespace scope other than global scope or declared static in global 5775 // scope. 5776 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5777 return true; 5778 5779 // C++ [basic.stc.dynamic.deallocation]p2: 5780 // Each deallocation function shall return void and its first parameter 5781 // shall be void*. 5782 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5783 SemaRef.Context.VoidPtrTy, 5784 diag::err_operator_delete_dependent_param_type, 5785 diag::err_operator_delete_param_type)) 5786 return true; 5787 5788 return false; 5789} 5790 5791/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5792/// of this overloaded operator is well-formed. If so, returns false; 5793/// otherwise, emits appropriate diagnostics and returns true. 5794bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5795 assert(FnDecl && FnDecl->isOverloadedOperator() && 5796 "Expected an overloaded operator declaration"); 5797 5798 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5799 5800 // C++ [over.oper]p5: 5801 // The allocation and deallocation functions, operator new, 5802 // operator new[], operator delete and operator delete[], are 5803 // described completely in 3.7.3. The attributes and restrictions 5804 // found in the rest of this subclause do not apply to them unless 5805 // explicitly stated in 3.7.3. 5806 if (Op == OO_Delete || Op == OO_Array_Delete) 5807 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5808 5809 if (Op == OO_New || Op == OO_Array_New) 5810 return CheckOperatorNewDeclaration(*this, FnDecl); 5811 5812 // C++ [over.oper]p6: 5813 // An operator function shall either be a non-static member 5814 // function or be a non-member function and have at least one 5815 // parameter whose type is a class, a reference to a class, an 5816 // enumeration, or a reference to an enumeration. 5817 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5818 if (MethodDecl->isStatic()) 5819 return Diag(FnDecl->getLocation(), 5820 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5821 } else { 5822 bool ClassOrEnumParam = false; 5823 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5824 ParamEnd = FnDecl->param_end(); 5825 Param != ParamEnd; ++Param) { 5826 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5827 if (ParamType->isDependentType() || ParamType->isRecordType() || 5828 ParamType->isEnumeralType()) { 5829 ClassOrEnumParam = true; 5830 break; 5831 } 5832 } 5833 5834 if (!ClassOrEnumParam) 5835 return Diag(FnDecl->getLocation(), 5836 diag::err_operator_overload_needs_class_or_enum) 5837 << FnDecl->getDeclName(); 5838 } 5839 5840 // C++ [over.oper]p8: 5841 // An operator function cannot have default arguments (8.3.6), 5842 // except where explicitly stated below. 5843 // 5844 // Only the function-call operator allows default arguments 5845 // (C++ [over.call]p1). 5846 if (Op != OO_Call) { 5847 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5848 Param != FnDecl->param_end(); ++Param) { 5849 if ((*Param)->hasDefaultArg()) 5850 return Diag((*Param)->getLocation(), 5851 diag::err_operator_overload_default_arg) 5852 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5853 } 5854 } 5855 5856 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5857 { false, false, false } 5858#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5859 , { Unary, Binary, MemberOnly } 5860#include "clang/Basic/OperatorKinds.def" 5861 }; 5862 5863 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5864 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5865 bool MustBeMemberOperator = OperatorUses[Op][2]; 5866 5867 // C++ [over.oper]p8: 5868 // [...] Operator functions cannot have more or fewer parameters 5869 // than the number required for the corresponding operator, as 5870 // described in the rest of this subclause. 5871 unsigned NumParams = FnDecl->getNumParams() 5872 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5873 if (Op != OO_Call && 5874 ((NumParams == 1 && !CanBeUnaryOperator) || 5875 (NumParams == 2 && !CanBeBinaryOperator) || 5876 (NumParams < 1) || (NumParams > 2))) { 5877 // We have the wrong number of parameters. 5878 unsigned ErrorKind; 5879 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5880 ErrorKind = 2; // 2 -> unary or binary. 5881 } else if (CanBeUnaryOperator) { 5882 ErrorKind = 0; // 0 -> unary 5883 } else { 5884 assert(CanBeBinaryOperator && 5885 "All non-call overloaded operators are unary or binary!"); 5886 ErrorKind = 1; // 1 -> binary 5887 } 5888 5889 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5890 << FnDecl->getDeclName() << NumParams << ErrorKind; 5891 } 5892 5893 // Overloaded operators other than operator() cannot be variadic. 5894 if (Op != OO_Call && 5895 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5896 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5897 << FnDecl->getDeclName(); 5898 } 5899 5900 // Some operators must be non-static member functions. 5901 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5902 return Diag(FnDecl->getLocation(), 5903 diag::err_operator_overload_must_be_member) 5904 << FnDecl->getDeclName(); 5905 } 5906 5907 // C++ [over.inc]p1: 5908 // The user-defined function called operator++ implements the 5909 // prefix and postfix ++ operator. If this function is a member 5910 // function with no parameters, or a non-member function with one 5911 // parameter of class or enumeration type, it defines the prefix 5912 // increment operator ++ for objects of that type. If the function 5913 // is a member function with one parameter (which shall be of type 5914 // int) or a non-member function with two parameters (the second 5915 // of which shall be of type int), it defines the postfix 5916 // increment operator ++ for objects of that type. 5917 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5918 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5919 bool ParamIsInt = false; 5920 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5921 ParamIsInt = BT->getKind() == BuiltinType::Int; 5922 5923 if (!ParamIsInt) 5924 return Diag(LastParam->getLocation(), 5925 diag::err_operator_overload_post_incdec_must_be_int) 5926 << LastParam->getType() << (Op == OO_MinusMinus); 5927 } 5928 5929 // Notify the class if it got an assignment operator. 5930 if (Op == OO_Equal) { 5931 // Would have returned earlier otherwise. 5932 assert(isa<CXXMethodDecl>(FnDecl) && 5933 "Overloaded = not member, but not filtered."); 5934 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5935 Method->getParent()->addedAssignmentOperator(Context, Method); 5936 } 5937 5938 return false; 5939} 5940 5941/// CheckLiteralOperatorDeclaration - Check whether the declaration 5942/// of this literal operator function is well-formed. If so, returns 5943/// false; otherwise, emits appropriate diagnostics and returns true. 5944bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5945 DeclContext *DC = FnDecl->getDeclContext(); 5946 Decl::Kind Kind = DC->getDeclKind(); 5947 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5948 Kind != Decl::LinkageSpec) { 5949 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5950 << FnDecl->getDeclName(); 5951 return true; 5952 } 5953 5954 bool Valid = false; 5955 5956 // template <char...> type operator "" name() is the only valid template 5957 // signature, and the only valid signature with no parameters. 5958 if (FnDecl->param_size() == 0) { 5959 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5960 // Must have only one template parameter 5961 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5962 if (Params->size() == 1) { 5963 NonTypeTemplateParmDecl *PmDecl = 5964 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5965 5966 // The template parameter must be a char parameter pack. 5967 // FIXME: This test will always fail because non-type parameter packs 5968 // have not been implemented. 5969 if (PmDecl && PmDecl->isTemplateParameterPack() && 5970 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5971 Valid = true; 5972 } 5973 } 5974 } else { 5975 // Check the first parameter 5976 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5977 5978 QualType T = (*Param)->getType(); 5979 5980 // unsigned long long int, long double, and any character type are allowed 5981 // as the only parameters. 5982 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5983 Context.hasSameType(T, Context.LongDoubleTy) || 5984 Context.hasSameType(T, Context.CharTy) || 5985 Context.hasSameType(T, Context.WCharTy) || 5986 Context.hasSameType(T, Context.Char16Ty) || 5987 Context.hasSameType(T, Context.Char32Ty)) { 5988 if (++Param == FnDecl->param_end()) 5989 Valid = true; 5990 goto FinishedParams; 5991 } 5992 5993 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5994 const PointerType *PT = T->getAs<PointerType>(); 5995 if (!PT) 5996 goto FinishedParams; 5997 T = PT->getPointeeType(); 5998 if (!T.isConstQualified()) 5999 goto FinishedParams; 6000 T = T.getUnqualifiedType(); 6001 6002 // Move on to the second parameter; 6003 ++Param; 6004 6005 // If there is no second parameter, the first must be a const char * 6006 if (Param == FnDecl->param_end()) { 6007 if (Context.hasSameType(T, Context.CharTy)) 6008 Valid = true; 6009 goto FinishedParams; 6010 } 6011 6012 // const char *, const wchar_t*, const char16_t*, and const char32_t* 6013 // are allowed as the first parameter to a two-parameter function 6014 if (!(Context.hasSameType(T, Context.CharTy) || 6015 Context.hasSameType(T, Context.WCharTy) || 6016 Context.hasSameType(T, Context.Char16Ty) || 6017 Context.hasSameType(T, Context.Char32Ty))) 6018 goto FinishedParams; 6019 6020 // The second and final parameter must be an std::size_t 6021 T = (*Param)->getType().getUnqualifiedType(); 6022 if (Context.hasSameType(T, Context.getSizeType()) && 6023 ++Param == FnDecl->param_end()) 6024 Valid = true; 6025 } 6026 6027 // FIXME: This diagnostic is absolutely terrible. 6028FinishedParams: 6029 if (!Valid) { 6030 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 6031 << FnDecl->getDeclName(); 6032 return true; 6033 } 6034 6035 return false; 6036} 6037 6038/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6039/// linkage specification, including the language and (if present) 6040/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6041/// the location of the language string literal, which is provided 6042/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6043/// the '{' brace. Otherwise, this linkage specification does not 6044/// have any braces. 6045Decl *Sema::ActOnStartLinkageSpecification(Scope *S, 6046 SourceLocation ExternLoc, 6047 SourceLocation LangLoc, 6048 llvm::StringRef Lang, 6049 SourceLocation LBraceLoc) { 6050 LinkageSpecDecl::LanguageIDs Language; 6051 if (Lang == "\"C\"") 6052 Language = LinkageSpecDecl::lang_c; 6053 else if (Lang == "\"C++\"") 6054 Language = LinkageSpecDecl::lang_cxx; 6055 else { 6056 Diag(LangLoc, diag::err_bad_language); 6057 return 0; 6058 } 6059 6060 // FIXME: Add all the various semantics of linkage specifications 6061 6062 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6063 LangLoc, Language, 6064 LBraceLoc.isValid()); 6065 CurContext->addDecl(D); 6066 PushDeclContext(S, D); 6067 return D; 6068} 6069 6070/// ActOnFinishLinkageSpecification - Complete the definition of 6071/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6072/// valid, it's the position of the closing '}' brace in a linkage 6073/// specification that uses braces. 6074Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6075 Decl *LinkageSpec, 6076 SourceLocation RBraceLoc) { 6077 if (LinkageSpec) 6078 PopDeclContext(); 6079 return LinkageSpec; 6080} 6081 6082/// \brief Perform semantic analysis for the variable declaration that 6083/// occurs within a C++ catch clause, returning the newly-created 6084/// variable. 6085VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 6086 TypeSourceInfo *TInfo, 6087 IdentifierInfo *Name, 6088 SourceLocation Loc, 6089 SourceRange Range) { 6090 bool Invalid = false; 6091 6092 // Arrays and functions decay. 6093 if (ExDeclType->isArrayType()) 6094 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6095 else if (ExDeclType->isFunctionType()) 6096 ExDeclType = Context.getPointerType(ExDeclType); 6097 6098 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6099 // The exception-declaration shall not denote a pointer or reference to an 6100 // incomplete type, other than [cv] void*. 6101 // N2844 forbids rvalue references. 6102 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6103 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 6104 Invalid = true; 6105 } 6106 6107 // GCC allows catching pointers and references to incomplete types 6108 // as an extension; so do we, but we warn by default. 6109 6110 QualType BaseType = ExDeclType; 6111 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6112 unsigned DK = diag::err_catch_incomplete; 6113 bool IncompleteCatchIsInvalid = true; 6114 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6115 BaseType = Ptr->getPointeeType(); 6116 Mode = 1; 6117 DK = diag::ext_catch_incomplete_ptr; 6118 IncompleteCatchIsInvalid = false; 6119 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6120 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6121 BaseType = Ref->getPointeeType(); 6122 Mode = 2; 6123 DK = diag::ext_catch_incomplete_ref; 6124 IncompleteCatchIsInvalid = false; 6125 } 6126 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6127 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6128 IncompleteCatchIsInvalid) 6129 Invalid = true; 6130 6131 if (!Invalid && !ExDeclType->isDependentType() && 6132 RequireNonAbstractType(Loc, ExDeclType, 6133 diag::err_abstract_type_in_decl, 6134 AbstractVariableType)) 6135 Invalid = true; 6136 6137 // Only the non-fragile NeXT runtime currently supports C++ catches 6138 // of ObjC types, and no runtime supports catching ObjC types by value. 6139 if (!Invalid && getLangOptions().ObjC1) { 6140 QualType T = ExDeclType; 6141 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6142 T = RT->getPointeeType(); 6143 6144 if (T->isObjCObjectType()) { 6145 Diag(Loc, diag::err_objc_object_catch); 6146 Invalid = true; 6147 } else if (T->isObjCObjectPointerType()) { 6148 if (!getLangOptions().NeXTRuntime) { 6149 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6150 Invalid = true; 6151 } else if (!getLangOptions().ObjCNonFragileABI) { 6152 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6153 Invalid = true; 6154 } 6155 } 6156 } 6157 6158 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6159 Name, ExDeclType, TInfo, SC_None, 6160 SC_None); 6161 ExDecl->setExceptionVariable(true); 6162 6163 if (!Invalid) { 6164 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6165 // C++ [except.handle]p16: 6166 // The object declared in an exception-declaration or, if the 6167 // exception-declaration does not specify a name, a temporary (12.2) is 6168 // copy-initialized (8.5) from the exception object. [...] 6169 // The object is destroyed when the handler exits, after the destruction 6170 // of any automatic objects initialized within the handler. 6171 // 6172 // We just pretend to initialize the object with itself, then make sure 6173 // it can be destroyed later. 6174 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6175 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6176 Loc, ExDeclType, 0); 6177 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6178 SourceLocation()); 6179 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6180 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6181 MultiExprArg(*this, &ExDeclRef, 1)); 6182 if (Result.isInvalid()) 6183 Invalid = true; 6184 else 6185 FinalizeVarWithDestructor(ExDecl, RecordTy); 6186 } 6187 } 6188 6189 if (Invalid) 6190 ExDecl->setInvalidDecl(); 6191 6192 return ExDecl; 6193} 6194 6195/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6196/// handler. 6197Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6198 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6199 QualType ExDeclType = TInfo->getType(); 6200 6201 bool Invalid = D.isInvalidType(); 6202 IdentifierInfo *II = D.getIdentifier(); 6203 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6204 LookupOrdinaryName, 6205 ForRedeclaration)) { 6206 // The scope should be freshly made just for us. There is just no way 6207 // it contains any previous declaration. 6208 assert(!S->isDeclScope(PrevDecl)); 6209 if (PrevDecl->isTemplateParameter()) { 6210 // Maybe we will complain about the shadowed template parameter. 6211 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6212 } 6213 } 6214 6215 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6216 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6217 << D.getCXXScopeSpec().getRange(); 6218 Invalid = true; 6219 } 6220 6221 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 6222 D.getIdentifier(), 6223 D.getIdentifierLoc(), 6224 D.getDeclSpec().getSourceRange()); 6225 6226 if (Invalid) 6227 ExDecl->setInvalidDecl(); 6228 6229 // Add the exception declaration into this scope. 6230 if (II) 6231 PushOnScopeChains(ExDecl, S); 6232 else 6233 CurContext->addDecl(ExDecl); 6234 6235 ProcessDeclAttributes(S, ExDecl, D); 6236 return ExDecl; 6237} 6238 6239Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6240 Expr *AssertExpr, 6241 Expr *AssertMessageExpr_) { 6242 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6243 6244 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6245 llvm::APSInt Value(32); 6246 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6247 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6248 AssertExpr->getSourceRange(); 6249 return 0; 6250 } 6251 6252 if (Value == 0) { 6253 Diag(AssertLoc, diag::err_static_assert_failed) 6254 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6255 } 6256 } 6257 6258 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6259 AssertExpr, AssertMessage); 6260 6261 CurContext->addDecl(Decl); 6262 return Decl; 6263} 6264 6265/// \brief Perform semantic analysis of the given friend type declaration. 6266/// 6267/// \returns A friend declaration that. 6268FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6269 TypeSourceInfo *TSInfo) { 6270 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6271 6272 QualType T = TSInfo->getType(); 6273 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6274 6275 if (!getLangOptions().CPlusPlus0x) { 6276 // C++03 [class.friend]p2: 6277 // An elaborated-type-specifier shall be used in a friend declaration 6278 // for a class.* 6279 // 6280 // * The class-key of the elaborated-type-specifier is required. 6281 if (!ActiveTemplateInstantiations.empty()) { 6282 // Do not complain about the form of friend template types during 6283 // template instantiation; we will already have complained when the 6284 // template was declared. 6285 } else if (!T->isElaboratedTypeSpecifier()) { 6286 // If we evaluated the type to a record type, suggest putting 6287 // a tag in front. 6288 if (const RecordType *RT = T->getAs<RecordType>()) { 6289 RecordDecl *RD = RT->getDecl(); 6290 6291 std::string InsertionText = std::string(" ") + RD->getKindName(); 6292 6293 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6294 << (unsigned) RD->getTagKind() 6295 << T 6296 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6297 InsertionText); 6298 } else { 6299 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6300 << T 6301 << SourceRange(FriendLoc, TypeRange.getEnd()); 6302 } 6303 } else if (T->getAs<EnumType>()) { 6304 Diag(FriendLoc, diag::ext_enum_friend) 6305 << T 6306 << SourceRange(FriendLoc, TypeRange.getEnd()); 6307 } 6308 } 6309 6310 // C++0x [class.friend]p3: 6311 // If the type specifier in a friend declaration designates a (possibly 6312 // cv-qualified) class type, that class is declared as a friend; otherwise, 6313 // the friend declaration is ignored. 6314 6315 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6316 // in [class.friend]p3 that we do not implement. 6317 6318 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6319} 6320 6321/// Handle a friend type declaration. This works in tandem with 6322/// ActOnTag. 6323/// 6324/// Notes on friend class templates: 6325/// 6326/// We generally treat friend class declarations as if they were 6327/// declaring a class. So, for example, the elaborated type specifier 6328/// in a friend declaration is required to obey the restrictions of a 6329/// class-head (i.e. no typedefs in the scope chain), template 6330/// parameters are required to match up with simple template-ids, &c. 6331/// However, unlike when declaring a template specialization, it's 6332/// okay to refer to a template specialization without an empty 6333/// template parameter declaration, e.g. 6334/// friend class A<T>::B<unsigned>; 6335/// We permit this as a special case; if there are any template 6336/// parameters present at all, require proper matching, i.e. 6337/// template <> template <class T> friend class A<int>::B; 6338Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6339 MultiTemplateParamsArg TempParams) { 6340 SourceLocation Loc = DS.getSourceRange().getBegin(); 6341 6342 assert(DS.isFriendSpecified()); 6343 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6344 6345 // Try to convert the decl specifier to a type. This works for 6346 // friend templates because ActOnTag never produces a ClassTemplateDecl 6347 // for a TUK_Friend. 6348 Declarator TheDeclarator(DS, Declarator::MemberContext); 6349 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6350 QualType T = TSI->getType(); 6351 if (TheDeclarator.isInvalidType()) 6352 return 0; 6353 6354 // This is definitely an error in C++98. It's probably meant to 6355 // be forbidden in C++0x, too, but the specification is just 6356 // poorly written. 6357 // 6358 // The problem is with declarations like the following: 6359 // template <T> friend A<T>::foo; 6360 // where deciding whether a class C is a friend or not now hinges 6361 // on whether there exists an instantiation of A that causes 6362 // 'foo' to equal C. There are restrictions on class-heads 6363 // (which we declare (by fiat) elaborated friend declarations to 6364 // be) that makes this tractable. 6365 // 6366 // FIXME: handle "template <> friend class A<T>;", which 6367 // is possibly well-formed? Who even knows? 6368 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6369 Diag(Loc, diag::err_tagless_friend_type_template) 6370 << DS.getSourceRange(); 6371 return 0; 6372 } 6373 6374 // C++98 [class.friend]p1: A friend of a class is a function 6375 // or class that is not a member of the class . . . 6376 // This is fixed in DR77, which just barely didn't make the C++03 6377 // deadline. It's also a very silly restriction that seriously 6378 // affects inner classes and which nobody else seems to implement; 6379 // thus we never diagnose it, not even in -pedantic. 6380 // 6381 // But note that we could warn about it: it's always useless to 6382 // friend one of your own members (it's not, however, worthless to 6383 // friend a member of an arbitrary specialization of your template). 6384 6385 Decl *D; 6386 if (unsigned NumTempParamLists = TempParams.size()) 6387 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6388 NumTempParamLists, 6389 (TemplateParameterList**) TempParams.release(), 6390 TSI, 6391 DS.getFriendSpecLoc()); 6392 else 6393 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6394 6395 if (!D) 6396 return 0; 6397 6398 D->setAccess(AS_public); 6399 CurContext->addDecl(D); 6400 6401 return D; 6402} 6403 6404Decl *Sema::ActOnFriendFunctionDecl(Scope *S, 6405 Declarator &D, 6406 bool IsDefinition, 6407 MultiTemplateParamsArg TemplateParams) { 6408 const DeclSpec &DS = D.getDeclSpec(); 6409 6410 assert(DS.isFriendSpecified()); 6411 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6412 6413 SourceLocation Loc = D.getIdentifierLoc(); 6414 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6415 QualType T = TInfo->getType(); 6416 6417 // C++ [class.friend]p1 6418 // A friend of a class is a function or class.... 6419 // Note that this sees through typedefs, which is intended. 6420 // It *doesn't* see through dependent types, which is correct 6421 // according to [temp.arg.type]p3: 6422 // If a declaration acquires a function type through a 6423 // type dependent on a template-parameter and this causes 6424 // a declaration that does not use the syntactic form of a 6425 // function declarator to have a function type, the program 6426 // is ill-formed. 6427 if (!T->isFunctionType()) { 6428 Diag(Loc, diag::err_unexpected_friend); 6429 6430 // It might be worthwhile to try to recover by creating an 6431 // appropriate declaration. 6432 return 0; 6433 } 6434 6435 // C++ [namespace.memdef]p3 6436 // - If a friend declaration in a non-local class first declares a 6437 // class or function, the friend class or function is a member 6438 // of the innermost enclosing namespace. 6439 // - The name of the friend is not found by simple name lookup 6440 // until a matching declaration is provided in that namespace 6441 // scope (either before or after the class declaration granting 6442 // friendship). 6443 // - If a friend function is called, its name may be found by the 6444 // name lookup that considers functions from namespaces and 6445 // classes associated with the types of the function arguments. 6446 // - When looking for a prior declaration of a class or a function 6447 // declared as a friend, scopes outside the innermost enclosing 6448 // namespace scope are not considered. 6449 6450 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 6451 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 6452 DeclarationName Name = NameInfo.getName(); 6453 assert(Name); 6454 6455 // The context we found the declaration in, or in which we should 6456 // create the declaration. 6457 DeclContext *DC; 6458 6459 // FIXME: handle local classes 6460 6461 // Recover from invalid scope qualifiers as if they just weren't there. 6462 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 6463 ForRedeclaration); 6464 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 6465 DC = computeDeclContext(ScopeQual); 6466 6467 // FIXME: handle dependent contexts 6468 if (!DC) return 0; 6469 if (RequireCompleteDeclContext(ScopeQual, DC)) return 0; 6470 6471 LookupQualifiedName(Previous, DC); 6472 6473 // Ignore things found implicitly in the wrong scope. 6474 // TODO: better diagnostics for this case. Suggesting the right 6475 // qualified scope would be nice... 6476 LookupResult::Filter F = Previous.makeFilter(); 6477 while (F.hasNext()) { 6478 NamedDecl *D = F.next(); 6479 if (!DC->InEnclosingNamespaceSetOf( 6480 D->getDeclContext()->getRedeclContext())) 6481 F.erase(); 6482 } 6483 F.done(); 6484 6485 if (Previous.empty()) { 6486 D.setInvalidType(); 6487 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6488 return 0; 6489 } 6490 6491 // C++ [class.friend]p1: A friend of a class is a function or 6492 // class that is not a member of the class . . . 6493 if (DC->Equals(CurContext)) 6494 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6495 6496 // Otherwise walk out to the nearest namespace scope looking for matches. 6497 } else { 6498 // TODO: handle local class contexts. 6499 6500 DC = CurContext; 6501 while (true) { 6502 // Skip class contexts. If someone can cite chapter and verse 6503 // for this behavior, that would be nice --- it's what GCC and 6504 // EDG do, and it seems like a reasonable intent, but the spec 6505 // really only says that checks for unqualified existing 6506 // declarations should stop at the nearest enclosing namespace, 6507 // not that they should only consider the nearest enclosing 6508 // namespace. 6509 while (DC->isRecord()) 6510 DC = DC->getParent(); 6511 6512 LookupQualifiedName(Previous, DC); 6513 6514 // TODO: decide what we think about using declarations. 6515 if (!Previous.empty()) 6516 break; 6517 6518 if (DC->isFileContext()) break; 6519 DC = DC->getParent(); 6520 } 6521 6522 // C++ [class.friend]p1: A friend of a class is a function or 6523 // class that is not a member of the class . . . 6524 // C++0x changes this for both friend types and functions. 6525 // Most C++ 98 compilers do seem to give an error here, so 6526 // we do, too. 6527 if (!Previous.empty() && DC->Equals(CurContext) 6528 && !getLangOptions().CPlusPlus0x) 6529 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6530 } 6531 6532 if (DC->isFileContext()) { 6533 // This implies that it has to be an operator or function. 6534 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6535 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6536 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6537 Diag(Loc, diag::err_introducing_special_friend) << 6538 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6539 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6540 return 0; 6541 } 6542 } 6543 6544 bool Redeclaration = false; 6545 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 6546 move(TemplateParams), 6547 IsDefinition, 6548 Redeclaration); 6549 if (!ND) return 0; 6550 6551 assert(ND->getDeclContext() == DC); 6552 assert(ND->getLexicalDeclContext() == CurContext); 6553 6554 // Add the function declaration to the appropriate lookup tables, 6555 // adjusting the redeclarations list as necessary. We don't 6556 // want to do this yet if the friending class is dependent. 6557 // 6558 // Also update the scope-based lookup if the target context's 6559 // lookup context is in lexical scope. 6560 if (!CurContext->isDependentContext()) { 6561 DC = DC->getRedeclContext(); 6562 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6563 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6564 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6565 } 6566 6567 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6568 D.getIdentifierLoc(), ND, 6569 DS.getFriendSpecLoc()); 6570 FrD->setAccess(AS_public); 6571 CurContext->addDecl(FrD); 6572 6573 return ND; 6574} 6575 6576void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 6577 AdjustDeclIfTemplate(Dcl); 6578 6579 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6580 if (!Fn) { 6581 Diag(DelLoc, diag::err_deleted_non_function); 6582 return; 6583 } 6584 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6585 Diag(DelLoc, diag::err_deleted_decl_not_first); 6586 Diag(Prev->getLocation(), diag::note_previous_declaration); 6587 // If the declaration wasn't the first, we delete the function anyway for 6588 // recovery. 6589 } 6590 Fn->setDeleted(); 6591} 6592 6593static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6594 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6595 ++CI) { 6596 Stmt *SubStmt = *CI; 6597 if (!SubStmt) 6598 continue; 6599 if (isa<ReturnStmt>(SubStmt)) 6600 Self.Diag(SubStmt->getSourceRange().getBegin(), 6601 diag::err_return_in_constructor_handler); 6602 if (!isa<Expr>(SubStmt)) 6603 SearchForReturnInStmt(Self, SubStmt); 6604 } 6605} 6606 6607void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6608 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6609 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6610 SearchForReturnInStmt(*this, Handler); 6611 } 6612} 6613 6614bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6615 const CXXMethodDecl *Old) { 6616 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6617 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6618 6619 if (Context.hasSameType(NewTy, OldTy) || 6620 NewTy->isDependentType() || OldTy->isDependentType()) 6621 return false; 6622 6623 // Check if the return types are covariant 6624 QualType NewClassTy, OldClassTy; 6625 6626 /// Both types must be pointers or references to classes. 6627 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6628 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6629 NewClassTy = NewPT->getPointeeType(); 6630 OldClassTy = OldPT->getPointeeType(); 6631 } 6632 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6633 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6634 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6635 NewClassTy = NewRT->getPointeeType(); 6636 OldClassTy = OldRT->getPointeeType(); 6637 } 6638 } 6639 } 6640 6641 // The return types aren't either both pointers or references to a class type. 6642 if (NewClassTy.isNull()) { 6643 Diag(New->getLocation(), 6644 diag::err_different_return_type_for_overriding_virtual_function) 6645 << New->getDeclName() << NewTy << OldTy; 6646 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6647 6648 return true; 6649 } 6650 6651 // C++ [class.virtual]p6: 6652 // If the return type of D::f differs from the return type of B::f, the 6653 // class type in the return type of D::f shall be complete at the point of 6654 // declaration of D::f or shall be the class type D. 6655 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6656 if (!RT->isBeingDefined() && 6657 RequireCompleteType(New->getLocation(), NewClassTy, 6658 PDiag(diag::err_covariant_return_incomplete) 6659 << New->getDeclName())) 6660 return true; 6661 } 6662 6663 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6664 // Check if the new class derives from the old class. 6665 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6666 Diag(New->getLocation(), 6667 diag::err_covariant_return_not_derived) 6668 << New->getDeclName() << NewTy << OldTy; 6669 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6670 return true; 6671 } 6672 6673 // Check if we the conversion from derived to base is valid. 6674 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6675 diag::err_covariant_return_inaccessible_base, 6676 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6677 // FIXME: Should this point to the return type? 6678 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6679 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6680 return true; 6681 } 6682 } 6683 6684 // The qualifiers of the return types must be the same. 6685 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6686 Diag(New->getLocation(), 6687 diag::err_covariant_return_type_different_qualifications) 6688 << New->getDeclName() << NewTy << OldTy; 6689 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6690 return true; 6691 }; 6692 6693 6694 // The new class type must have the same or less qualifiers as the old type. 6695 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6696 Diag(New->getLocation(), 6697 diag::err_covariant_return_type_class_type_more_qualified) 6698 << New->getDeclName() << NewTy << OldTy; 6699 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6700 return true; 6701 }; 6702 6703 return false; 6704} 6705 6706bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6707 const CXXMethodDecl *Old) 6708{ 6709 if (Old->hasAttr<FinalAttr>()) { 6710 Diag(New->getLocation(), diag::err_final_function_overridden) 6711 << New->getDeclName(); 6712 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6713 return true; 6714 } 6715 6716 return false; 6717} 6718 6719/// \brief Mark the given method pure. 6720/// 6721/// \param Method the method to be marked pure. 6722/// 6723/// \param InitRange the source range that covers the "0" initializer. 6724bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6725 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6726 Method->setPure(); 6727 6728 // A class is abstract if at least one function is pure virtual. 6729 Method->getParent()->setAbstract(true); 6730 return false; 6731 } 6732 6733 if (!Method->isInvalidDecl()) 6734 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6735 << Method->getDeclName() << InitRange; 6736 return true; 6737} 6738 6739/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6740/// an initializer for the out-of-line declaration 'Dcl'. The scope 6741/// is a fresh scope pushed for just this purpose. 6742/// 6743/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6744/// static data member of class X, names should be looked up in the scope of 6745/// class X. 6746void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 6747 // If there is no declaration, there was an error parsing it. 6748 if (D == 0) return; 6749 6750 // We should only get called for declarations with scope specifiers, like: 6751 // int foo::bar; 6752 assert(D->isOutOfLine()); 6753 EnterDeclaratorContext(S, D->getDeclContext()); 6754} 6755 6756/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6757/// initializer for the out-of-line declaration 'D'. 6758void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 6759 // If there is no declaration, there was an error parsing it. 6760 if (D == 0) return; 6761 6762 assert(D->isOutOfLine()); 6763 ExitDeclaratorContext(S); 6764} 6765 6766/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6767/// C++ if/switch/while/for statement. 6768/// e.g: "if (int x = f()) {...}" 6769DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6770 // C++ 6.4p2: 6771 // The declarator shall not specify a function or an array. 6772 // The type-specifier-seq shall not contain typedef and shall not declare a 6773 // new class or enumeration. 6774 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6775 "Parser allowed 'typedef' as storage class of condition decl."); 6776 6777 TagDecl *OwnedTag = 0; 6778 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6779 QualType Ty = TInfo->getType(); 6780 6781 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6782 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6783 // would be created and CXXConditionDeclExpr wants a VarDecl. 6784 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6785 << D.getSourceRange(); 6786 return DeclResult(); 6787 } else if (OwnedTag && OwnedTag->isDefinition()) { 6788 // The type-specifier-seq shall not declare a new class or enumeration. 6789 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6790 } 6791 6792 Decl *Dcl = ActOnDeclarator(S, D); 6793 if (!Dcl) 6794 return DeclResult(); 6795 6796 return Dcl; 6797} 6798 6799void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6800 bool DefinitionRequired) { 6801 // Ignore any vtable uses in unevaluated operands or for classes that do 6802 // not have a vtable. 6803 if (!Class->isDynamicClass() || Class->isDependentContext() || 6804 CurContext->isDependentContext() || 6805 ExprEvalContexts.back().Context == Unevaluated) 6806 return; 6807 6808 // Try to insert this class into the map. 6809 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6810 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6811 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6812 if (!Pos.second) { 6813 // If we already had an entry, check to see if we are promoting this vtable 6814 // to required a definition. If so, we need to reappend to the VTableUses 6815 // list, since we may have already processed the first entry. 6816 if (DefinitionRequired && !Pos.first->second) { 6817 Pos.first->second = true; 6818 } else { 6819 // Otherwise, we can early exit. 6820 return; 6821 } 6822 } 6823 6824 // Local classes need to have their virtual members marked 6825 // immediately. For all other classes, we mark their virtual members 6826 // at the end of the translation unit. 6827 if (Class->isLocalClass()) 6828 MarkVirtualMembersReferenced(Loc, Class); 6829 else 6830 VTableUses.push_back(std::make_pair(Class, Loc)); 6831} 6832 6833bool Sema::DefineUsedVTables() { 6834 // If any dynamic classes have their key function defined within 6835 // this translation unit, then those vtables are considered "used" and must 6836 // be emitted. 6837 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6838 if (const CXXMethodDecl *KeyFunction 6839 = Context.getKeyFunction(DynamicClasses[I])) { 6840 const FunctionDecl *Definition = 0; 6841 if (KeyFunction->hasBody(Definition)) 6842 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6843 } 6844 } 6845 6846 if (VTableUses.empty()) 6847 return false; 6848 6849 // Note: The VTableUses vector could grow as a result of marking 6850 // the members of a class as "used", so we check the size each 6851 // time through the loop and prefer indices (with are stable) to 6852 // iterators (which are not). 6853 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6854 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6855 if (!Class) 6856 continue; 6857 6858 SourceLocation Loc = VTableUses[I].second; 6859 6860 // If this class has a key function, but that key function is 6861 // defined in another translation unit, we don't need to emit the 6862 // vtable even though we're using it. 6863 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6864 if (KeyFunction && !KeyFunction->hasBody()) { 6865 switch (KeyFunction->getTemplateSpecializationKind()) { 6866 case TSK_Undeclared: 6867 case TSK_ExplicitSpecialization: 6868 case TSK_ExplicitInstantiationDeclaration: 6869 // The key function is in another translation unit. 6870 continue; 6871 6872 case TSK_ExplicitInstantiationDefinition: 6873 case TSK_ImplicitInstantiation: 6874 // We will be instantiating the key function. 6875 break; 6876 } 6877 } else if (!KeyFunction) { 6878 // If we have a class with no key function that is the subject 6879 // of an explicit instantiation declaration, suppress the 6880 // vtable; it will live with the explicit instantiation 6881 // definition. 6882 bool IsExplicitInstantiationDeclaration 6883 = Class->getTemplateSpecializationKind() 6884 == TSK_ExplicitInstantiationDeclaration; 6885 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6886 REnd = Class->redecls_end(); 6887 R != REnd; ++R) { 6888 TemplateSpecializationKind TSK 6889 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6890 if (TSK == TSK_ExplicitInstantiationDeclaration) 6891 IsExplicitInstantiationDeclaration = true; 6892 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6893 IsExplicitInstantiationDeclaration = false; 6894 break; 6895 } 6896 } 6897 6898 if (IsExplicitInstantiationDeclaration) 6899 continue; 6900 } 6901 6902 // Mark all of the virtual members of this class as referenced, so 6903 // that we can build a vtable. Then, tell the AST consumer that a 6904 // vtable for this class is required. 6905 MarkVirtualMembersReferenced(Loc, Class); 6906 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6907 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6908 6909 // Optionally warn if we're emitting a weak vtable. 6910 if (Class->getLinkage() == ExternalLinkage && 6911 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6912 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 6913 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6914 } 6915 } 6916 VTableUses.clear(); 6917 6918 return true; 6919} 6920 6921void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6922 const CXXRecordDecl *RD) { 6923 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6924 e = RD->method_end(); i != e; ++i) { 6925 CXXMethodDecl *MD = *i; 6926 6927 // C++ [basic.def.odr]p2: 6928 // [...] A virtual member function is used if it is not pure. [...] 6929 if (MD->isVirtual() && !MD->isPure()) 6930 MarkDeclarationReferenced(Loc, MD); 6931 } 6932 6933 // Only classes that have virtual bases need a VTT. 6934 if (RD->getNumVBases() == 0) 6935 return; 6936 6937 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6938 e = RD->bases_end(); i != e; ++i) { 6939 const CXXRecordDecl *Base = 6940 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6941 if (Base->getNumVBases() == 0) 6942 continue; 6943 MarkVirtualMembersReferenced(Loc, Base); 6944 } 6945} 6946 6947/// SetIvarInitializers - This routine builds initialization ASTs for the 6948/// Objective-C implementation whose ivars need be initialized. 6949void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6950 if (!getLangOptions().CPlusPlus) 6951 return; 6952 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6953 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6954 CollectIvarsToConstructOrDestruct(OID, ivars); 6955 if (ivars.empty()) 6956 return; 6957 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6958 for (unsigned i = 0; i < ivars.size(); i++) { 6959 FieldDecl *Field = ivars[i]; 6960 if (Field->isInvalidDecl()) 6961 continue; 6962 6963 CXXBaseOrMemberInitializer *Member; 6964 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6965 InitializationKind InitKind = 6966 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6967 6968 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6969 ExprResult MemberInit = 6970 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 6971 MemberInit = MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 6972 // Note, MemberInit could actually come back empty if no initialization 6973 // is required (e.g., because it would call a trivial default constructor) 6974 if (!MemberInit.get() || MemberInit.isInvalid()) 6975 continue; 6976 6977 Member = 6978 new (Context) CXXBaseOrMemberInitializer(Context, 6979 Field, SourceLocation(), 6980 SourceLocation(), 6981 MemberInit.takeAs<Expr>(), 6982 SourceLocation()); 6983 AllToInit.push_back(Member); 6984 6985 // Be sure that the destructor is accessible and is marked as referenced. 6986 if (const RecordType *RecordTy 6987 = Context.getBaseElementType(Field->getType()) 6988 ->getAs<RecordType>()) { 6989 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6990 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 6991 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6992 CheckDestructorAccess(Field->getLocation(), Destructor, 6993 PDiag(diag::err_access_dtor_ivar) 6994 << Context.getBaseElementType(Field->getType())); 6995 } 6996 } 6997 } 6998 ObjCImplementation->setIvarInitializers(Context, 6999 AllToInit.data(), AllToInit.size()); 7000 } 7001} 7002