SemaDeclCXX.cpp revision 2d88708cbe4e4ec5e04e4acb6bd7f5be68557379
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. 587Sema::BaseResult 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 if (BitWidth) DeleteExpr(BitWidth); 962 return 0; 963 } 964 965 // Non-instance-fields can't have a bitfield. 966 if (BitWidth) { 967 if (Member->isInvalidDecl()) { 968 // don't emit another diagnostic. 969 } else if (isa<VarDecl>(Member)) { 970 // C++ 9.6p3: A bit-field shall not be a static member. 971 // "static member 'A' cannot be a bit-field" 972 Diag(Loc, diag::err_static_not_bitfield) 973 << Name << BitWidth->getSourceRange(); 974 } else if (isa<TypedefDecl>(Member)) { 975 // "typedef member 'x' cannot be a bit-field" 976 Diag(Loc, diag::err_typedef_not_bitfield) 977 << Name << BitWidth->getSourceRange(); 978 } else { 979 // A function typedef ("typedef int f(); f a;"). 980 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 981 Diag(Loc, diag::err_not_integral_type_bitfield) 982 << Name << cast<ValueDecl>(Member)->getType() 983 << BitWidth->getSourceRange(); 984 } 985 986 DeleteExpr(BitWidth); 987 BitWidth = 0; 988 Member->setInvalidDecl(); 989 } 990 991 Member->setAccess(AS); 992 993 // If we have declared a member function template, set the access of the 994 // templated declaration as well. 995 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 996 FunTmpl->getTemplatedDecl()->setAccess(AS); 997 } 998 999 assert((Name || isInstField) && "No identifier for non-field ?"); 1000 1001 if (Init) 1002 AddInitializerToDecl(Member, Init, false); 1003 if (Deleted) // FIXME: Source location is not very good. 1004 SetDeclDeleted(Member, D.getSourceRange().getBegin()); 1005 1006 if (isInstField) { 1007 FieldCollector->Add(cast<FieldDecl>(Member)); 1008 return 0; 1009 } 1010 return Member; 1011} 1012 1013/// \brief Find the direct and/or virtual base specifiers that 1014/// correspond to the given base type, for use in base initialization 1015/// within a constructor. 1016static bool FindBaseInitializer(Sema &SemaRef, 1017 CXXRecordDecl *ClassDecl, 1018 QualType BaseType, 1019 const CXXBaseSpecifier *&DirectBaseSpec, 1020 const CXXBaseSpecifier *&VirtualBaseSpec) { 1021 // First, check for a direct base class. 1022 DirectBaseSpec = 0; 1023 for (CXXRecordDecl::base_class_const_iterator Base 1024 = ClassDecl->bases_begin(); 1025 Base != ClassDecl->bases_end(); ++Base) { 1026 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1027 // We found a direct base of this type. That's what we're 1028 // initializing. 1029 DirectBaseSpec = &*Base; 1030 break; 1031 } 1032 } 1033 1034 // Check for a virtual base class. 1035 // FIXME: We might be able to short-circuit this if we know in advance that 1036 // there are no virtual bases. 1037 VirtualBaseSpec = 0; 1038 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1039 // We haven't found a base yet; search the class hierarchy for a 1040 // virtual base class. 1041 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1042 /*DetectVirtual=*/false); 1043 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1044 BaseType, Paths)) { 1045 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1046 Path != Paths.end(); ++Path) { 1047 if (Path->back().Base->isVirtual()) { 1048 VirtualBaseSpec = Path->back().Base; 1049 break; 1050 } 1051 } 1052 } 1053 } 1054 1055 return DirectBaseSpec || VirtualBaseSpec; 1056} 1057 1058/// ActOnMemInitializer - Handle a C++ member initializer. 1059Sema::MemInitResult 1060Sema::ActOnMemInitializer(Decl *ConstructorD, 1061 Scope *S, 1062 CXXScopeSpec &SS, 1063 IdentifierInfo *MemberOrBase, 1064 ParsedType TemplateTypeTy, 1065 SourceLocation IdLoc, 1066 SourceLocation LParenLoc, 1067 ExprTy **Args, unsigned NumArgs, 1068 SourceLocation *CommaLocs, 1069 SourceLocation RParenLoc) { 1070 if (!ConstructorD) 1071 return true; 1072 1073 AdjustDeclIfTemplate(ConstructorD); 1074 1075 CXXConstructorDecl *Constructor 1076 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1077 if (!Constructor) { 1078 // The user wrote a constructor initializer on a function that is 1079 // not a C++ constructor. Ignore the error for now, because we may 1080 // have more member initializers coming; we'll diagnose it just 1081 // once in ActOnMemInitializers. 1082 return true; 1083 } 1084 1085 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1086 1087 // C++ [class.base.init]p2: 1088 // Names in a mem-initializer-id are looked up in the scope of the 1089 // constructor’s class and, if not found in that scope, are looked 1090 // up in the scope containing the constructor’s 1091 // definition. [Note: if the constructor’s class contains a member 1092 // with the same name as a direct or virtual base class of the 1093 // class, a mem-initializer-id naming the member or base class and 1094 // composed of a single identifier refers to the class member. A 1095 // mem-initializer-id for the hidden base class may be specified 1096 // using a qualified name. ] 1097 if (!SS.getScopeRep() && !TemplateTypeTy) { 1098 // Look for a member, first. 1099 FieldDecl *Member = 0; 1100 DeclContext::lookup_result Result 1101 = ClassDecl->lookup(MemberOrBase); 1102 if (Result.first != Result.second) 1103 Member = dyn_cast<FieldDecl>(*Result.first); 1104 1105 // FIXME: Handle members of an anonymous union. 1106 1107 if (Member) 1108 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1109 LParenLoc, RParenLoc); 1110 } 1111 // It didn't name a member, so see if it names a class. 1112 QualType BaseType; 1113 TypeSourceInfo *TInfo = 0; 1114 1115 if (TemplateTypeTy) { 1116 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1117 } else { 1118 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1119 LookupParsedName(R, S, &SS); 1120 1121 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1122 if (!TyD) { 1123 if (R.isAmbiguous()) return true; 1124 1125 // We don't want access-control diagnostics here. 1126 R.suppressDiagnostics(); 1127 1128 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1129 bool NotUnknownSpecialization = false; 1130 DeclContext *DC = computeDeclContext(SS, false); 1131 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1132 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1133 1134 if (!NotUnknownSpecialization) { 1135 // When the scope specifier can refer to a member of an unknown 1136 // specialization, we take it as a type name. 1137 BaseType = CheckTypenameType(ETK_None, 1138 (NestedNameSpecifier *)SS.getScopeRep(), 1139 *MemberOrBase, SourceLocation(), 1140 SS.getRange(), IdLoc); 1141 if (BaseType.isNull()) 1142 return true; 1143 1144 R.clear(); 1145 R.setLookupName(MemberOrBase); 1146 } 1147 } 1148 1149 // If no results were found, try to correct typos. 1150 if (R.empty() && BaseType.isNull() && 1151 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1152 R.isSingleResult()) { 1153 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1154 if (Member->getDeclContext()->getLookupContext()->Equals(ClassDecl)) { 1155 // We have found a non-static data member with a similar 1156 // name to what was typed; complain and initialize that 1157 // member. 1158 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1159 << MemberOrBase << true << R.getLookupName() 1160 << FixItHint::CreateReplacement(R.getNameLoc(), 1161 R.getLookupName().getAsString()); 1162 Diag(Member->getLocation(), diag::note_previous_decl) 1163 << Member->getDeclName(); 1164 1165 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1166 LParenLoc, RParenLoc); 1167 } 1168 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1169 const CXXBaseSpecifier *DirectBaseSpec; 1170 const CXXBaseSpecifier *VirtualBaseSpec; 1171 if (FindBaseInitializer(*this, ClassDecl, 1172 Context.getTypeDeclType(Type), 1173 DirectBaseSpec, VirtualBaseSpec)) { 1174 // We have found a direct or virtual base class with a 1175 // similar name to what was typed; complain and initialize 1176 // that base class. 1177 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1178 << MemberOrBase << false << R.getLookupName() 1179 << FixItHint::CreateReplacement(R.getNameLoc(), 1180 R.getLookupName().getAsString()); 1181 1182 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1183 : VirtualBaseSpec; 1184 Diag(BaseSpec->getSourceRange().getBegin(), 1185 diag::note_base_class_specified_here) 1186 << BaseSpec->getType() 1187 << BaseSpec->getSourceRange(); 1188 1189 TyD = Type; 1190 } 1191 } 1192 } 1193 1194 if (!TyD && BaseType.isNull()) { 1195 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1196 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1197 return true; 1198 } 1199 } 1200 1201 if (BaseType.isNull()) { 1202 BaseType = Context.getTypeDeclType(TyD); 1203 if (SS.isSet()) { 1204 NestedNameSpecifier *Qualifier = 1205 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1206 1207 // FIXME: preserve source range information 1208 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1209 } 1210 } 1211 } 1212 1213 if (!TInfo) 1214 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1215 1216 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1217 LParenLoc, RParenLoc, ClassDecl); 1218} 1219 1220/// Checks an initializer expression for use of uninitialized fields, such as 1221/// containing the field that is being initialized. Returns true if there is an 1222/// uninitialized field was used an updates the SourceLocation parameter; false 1223/// otherwise. 1224static bool InitExprContainsUninitializedFields(const Stmt *S, 1225 const FieldDecl *LhsField, 1226 SourceLocation *L) { 1227 if (isa<CallExpr>(S)) { 1228 // Do not descend into function calls or constructors, as the use 1229 // of an uninitialized field may be valid. One would have to inspect 1230 // the contents of the function/ctor to determine if it is safe or not. 1231 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1232 // may be safe, depending on what the function/ctor does. 1233 return false; 1234 } 1235 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1236 const NamedDecl *RhsField = ME->getMemberDecl(); 1237 if (RhsField == LhsField) { 1238 // Initializing a field with itself. Throw a warning. 1239 // But wait; there are exceptions! 1240 // Exception #1: The field may not belong to this record. 1241 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1242 const Expr *base = ME->getBase(); 1243 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1244 // Even though the field matches, it does not belong to this record. 1245 return false; 1246 } 1247 // None of the exceptions triggered; return true to indicate an 1248 // uninitialized field was used. 1249 *L = ME->getMemberLoc(); 1250 return true; 1251 } 1252 } 1253 for (Stmt::const_child_iterator it = S->child_begin(), e = S->child_end(); 1254 it != e; ++it) { 1255 if (!*it) { 1256 // An expression such as 'member(arg ?: "")' may trigger this. 1257 continue; 1258 } 1259 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1260 return true; 1261 } 1262 return false; 1263} 1264 1265Sema::MemInitResult 1266Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1267 unsigned NumArgs, SourceLocation IdLoc, 1268 SourceLocation LParenLoc, 1269 SourceLocation RParenLoc) { 1270 // Diagnose value-uses of fields to initialize themselves, e.g. 1271 // foo(foo) 1272 // where foo is not also a parameter to the constructor. 1273 // TODO: implement -Wuninitialized and fold this into that framework. 1274 for (unsigned i = 0; i < NumArgs; ++i) { 1275 SourceLocation L; 1276 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1277 // FIXME: Return true in the case when other fields are used before being 1278 // uninitialized. For example, let this field be the i'th field. When 1279 // initializing the i'th field, throw a warning if any of the >= i'th 1280 // fields are used, as they are not yet initialized. 1281 // Right now we are only handling the case where the i'th field uses 1282 // itself in its initializer. 1283 Diag(L, diag::warn_field_is_uninit); 1284 } 1285 } 1286 1287 bool HasDependentArg = false; 1288 for (unsigned i = 0; i < NumArgs; i++) 1289 HasDependentArg |= Args[i]->isTypeDependent(); 1290 1291 if (Member->getType()->isDependentType() || HasDependentArg) { 1292 // Can't check initialization for a member of dependent type or when 1293 // any of the arguments are type-dependent expressions. 1294 Expr *Init 1295 = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1296 RParenLoc); 1297 1298 // Erase any temporaries within this evaluation context; we're not 1299 // going to track them in the AST, since we'll be rebuilding the 1300 // ASTs during template instantiation. 1301 ExprTemporaries.erase( 1302 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1303 ExprTemporaries.end()); 1304 1305 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1306 LParenLoc, 1307 Init, 1308 RParenLoc); 1309 1310 } 1311 1312 if (Member->isInvalidDecl()) 1313 return true; 1314 1315 // Initialize the member. 1316 InitializedEntity MemberEntity = 1317 InitializedEntity::InitializeMember(Member, 0); 1318 InitializationKind Kind = 1319 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1320 1321 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1322 1323 ExprResult MemberInit = 1324 InitSeq.Perform(*this, MemberEntity, Kind, 1325 MultiExprArg(*this, Args, NumArgs), 0); 1326 if (MemberInit.isInvalid()) 1327 return true; 1328 1329 // C++0x [class.base.init]p7: 1330 // The initialization of each base and member constitutes a 1331 // full-expression. 1332 MemberInit = MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1333 if (MemberInit.isInvalid()) 1334 return true; 1335 1336 // If we are in a dependent context, template instantiation will 1337 // perform this type-checking again. Just save the arguments that we 1338 // received in a ParenListExpr. 1339 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1340 // of the information that we have about the member 1341 // initializer. However, deconstructing the ASTs is a dicey process, 1342 // and this approach is far more likely to get the corner cases right. 1343 if (CurContext->isDependentContext()) { 1344 // Bump the reference count of all of the arguments. 1345 for (unsigned I = 0; I != NumArgs; ++I) 1346 Args[I]->Retain(); 1347 1348 Expr *Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1349 RParenLoc); 1350 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1351 LParenLoc, 1352 Init, 1353 RParenLoc); 1354 } 1355 1356 return new (Context) CXXBaseOrMemberInitializer(Context, Member, IdLoc, 1357 LParenLoc, 1358 MemberInit.get(), 1359 RParenLoc); 1360} 1361 1362Sema::MemInitResult 1363Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1364 Expr **Args, unsigned NumArgs, 1365 SourceLocation LParenLoc, SourceLocation RParenLoc, 1366 CXXRecordDecl *ClassDecl) { 1367 bool HasDependentArg = false; 1368 for (unsigned i = 0; i < NumArgs; i++) 1369 HasDependentArg |= Args[i]->isTypeDependent(); 1370 1371 SourceLocation BaseLoc 1372 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1373 1374 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1375 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1376 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1377 1378 // C++ [class.base.init]p2: 1379 // [...] Unless the mem-initializer-id names a nonstatic data 1380 // member of the constructor’s class or a direct or virtual base 1381 // of that class, the mem-initializer is ill-formed. A 1382 // mem-initializer-list can initialize a base class using any 1383 // name that denotes that base class type. 1384 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1385 1386 // Check for direct and virtual base classes. 1387 const CXXBaseSpecifier *DirectBaseSpec = 0; 1388 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1389 if (!Dependent) { 1390 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1391 VirtualBaseSpec); 1392 1393 // C++ [base.class.init]p2: 1394 // Unless the mem-initializer-id names a nonstatic data member of the 1395 // constructor's class or a direct or virtual base of that class, the 1396 // mem-initializer is ill-formed. 1397 if (!DirectBaseSpec && !VirtualBaseSpec) { 1398 // If the class has any dependent bases, then it's possible that 1399 // one of those types will resolve to the same type as 1400 // BaseType. Therefore, just treat this as a dependent base 1401 // class initialization. FIXME: Should we try to check the 1402 // initialization anyway? It seems odd. 1403 if (ClassDecl->hasAnyDependentBases()) 1404 Dependent = true; 1405 else 1406 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1407 << BaseType << Context.getTypeDeclType(ClassDecl) 1408 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1409 } 1410 } 1411 1412 if (Dependent) { 1413 // Can't check initialization for a base of dependent type or when 1414 // any of the arguments are type-dependent expressions. 1415 ExprResult BaseInit 1416 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1417 RParenLoc)); 1418 1419 // Erase any temporaries within this evaluation context; we're not 1420 // going to track them in the AST, since we'll be rebuilding the 1421 // ASTs during template instantiation. 1422 ExprTemporaries.erase( 1423 ExprTemporaries.begin() + ExprEvalContexts.back().NumTemporaries, 1424 ExprTemporaries.end()); 1425 1426 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1427 /*IsVirtual=*/false, 1428 LParenLoc, 1429 BaseInit.takeAs<Expr>(), 1430 RParenLoc); 1431 } 1432 1433 // C++ [base.class.init]p2: 1434 // If a mem-initializer-id is ambiguous because it designates both 1435 // a direct non-virtual base class and an inherited virtual base 1436 // class, the mem-initializer is ill-formed. 1437 if (DirectBaseSpec && VirtualBaseSpec) 1438 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1439 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1440 1441 CXXBaseSpecifier *BaseSpec 1442 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1443 if (!BaseSpec) 1444 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1445 1446 // Initialize the base. 1447 InitializedEntity BaseEntity = 1448 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1449 InitializationKind Kind = 1450 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1451 1452 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1453 1454 ExprResult BaseInit = 1455 InitSeq.Perform(*this, BaseEntity, Kind, 1456 MultiExprArg(*this, Args, NumArgs), 0); 1457 if (BaseInit.isInvalid()) 1458 return true; 1459 1460 // C++0x [class.base.init]p7: 1461 // The initialization of each base and member constitutes a 1462 // full-expression. 1463 BaseInit = MaybeCreateCXXExprWithTemporaries(BaseInit.get()); 1464 if (BaseInit.isInvalid()) 1465 return true; 1466 1467 // If we are in a dependent context, template instantiation will 1468 // perform this type-checking again. Just save the arguments that we 1469 // received in a ParenListExpr. 1470 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1471 // of the information that we have about the base 1472 // initializer. However, deconstructing the ASTs is a dicey process, 1473 // and this approach is far more likely to get the corner cases right. 1474 if (CurContext->isDependentContext()) { 1475 // Bump the reference count of all of the arguments. 1476 for (unsigned I = 0; I != NumArgs; ++I) 1477 Args[I]->Retain(); 1478 1479 ExprResult Init 1480 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1481 RParenLoc)); 1482 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1483 BaseSpec->isVirtual(), 1484 LParenLoc, 1485 Init.takeAs<Expr>(), 1486 RParenLoc); 1487 } 1488 1489 return new (Context) CXXBaseOrMemberInitializer(Context, BaseTInfo, 1490 BaseSpec->isVirtual(), 1491 LParenLoc, 1492 BaseInit.takeAs<Expr>(), 1493 RParenLoc); 1494} 1495 1496/// ImplicitInitializerKind - How an implicit base or member initializer should 1497/// initialize its base or member. 1498enum ImplicitInitializerKind { 1499 IIK_Default, 1500 IIK_Copy, 1501 IIK_Move 1502}; 1503 1504static bool 1505BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1506 ImplicitInitializerKind ImplicitInitKind, 1507 CXXBaseSpecifier *BaseSpec, 1508 bool IsInheritedVirtualBase, 1509 CXXBaseOrMemberInitializer *&CXXBaseInit) { 1510 InitializedEntity InitEntity 1511 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1512 IsInheritedVirtualBase); 1513 1514 ExprResult BaseInit; 1515 1516 switch (ImplicitInitKind) { 1517 case IIK_Default: { 1518 InitializationKind InitKind 1519 = InitializationKind::CreateDefault(Constructor->getLocation()); 1520 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1521 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1522 Sema::MultiExprArg(SemaRef, 0, 0)); 1523 break; 1524 } 1525 1526 case IIK_Copy: { 1527 ParmVarDecl *Param = Constructor->getParamDecl(0); 1528 QualType ParamType = Param->getType().getNonReferenceType(); 1529 1530 Expr *CopyCtorArg = 1531 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1532 Constructor->getLocation(), ParamType, 0); 1533 1534 // Cast to the base class to avoid ambiguities. 1535 QualType ArgTy = 1536 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1537 ParamType.getQualifiers()); 1538 1539 CXXCastPath BasePath; 1540 BasePath.push_back(BaseSpec); 1541 SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1542 CK_UncheckedDerivedToBase, 1543 VK_LValue, &BasePath); 1544 1545 InitializationKind InitKind 1546 = InitializationKind::CreateDirect(Constructor->getLocation(), 1547 SourceLocation(), SourceLocation()); 1548 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1549 &CopyCtorArg, 1); 1550 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1551 Sema::MultiExprArg(SemaRef, 1552 &CopyCtorArg, 1)); 1553 break; 1554 } 1555 1556 case IIK_Move: 1557 assert(false && "Unhandled initializer kind!"); 1558 } 1559 1560 if (BaseInit.isInvalid()) 1561 return true; 1562 1563 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(BaseInit.get()); 1564 if (BaseInit.isInvalid()) 1565 return true; 1566 1567 CXXBaseInit = 1568 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1569 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1570 SourceLocation()), 1571 BaseSpec->isVirtual(), 1572 SourceLocation(), 1573 BaseInit.takeAs<Expr>(), 1574 SourceLocation()); 1575 1576 return false; 1577} 1578 1579static bool 1580BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1581 ImplicitInitializerKind ImplicitInitKind, 1582 FieldDecl *Field, 1583 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1584 if (Field->isInvalidDecl()) 1585 return true; 1586 1587 SourceLocation Loc = Constructor->getLocation(); 1588 1589 if (ImplicitInitKind == IIK_Copy) { 1590 ParmVarDecl *Param = Constructor->getParamDecl(0); 1591 QualType ParamType = Param->getType().getNonReferenceType(); 1592 1593 Expr *MemberExprBase = 1594 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1595 Loc, ParamType, 0); 1596 1597 // Build a reference to this field within the parameter. 1598 CXXScopeSpec SS; 1599 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1600 Sema::LookupMemberName); 1601 MemberLookup.addDecl(Field, AS_public); 1602 MemberLookup.resolveKind(); 1603 ExprResult CopyCtorArg 1604 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1605 ParamType, Loc, 1606 /*IsArrow=*/false, 1607 SS, 1608 /*FirstQualifierInScope=*/0, 1609 MemberLookup, 1610 /*TemplateArgs=*/0); 1611 if (CopyCtorArg.isInvalid()) 1612 return true; 1613 1614 // When the field we are copying is an array, create index variables for 1615 // each dimension of the array. We use these index variables to subscript 1616 // the source array, and other clients (e.g., CodeGen) will perform the 1617 // necessary iteration with these index variables. 1618 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1619 QualType BaseType = Field->getType(); 1620 QualType SizeType = SemaRef.Context.getSizeType(); 1621 while (const ConstantArrayType *Array 1622 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1623 // Create the iteration variable for this array index. 1624 IdentifierInfo *IterationVarName = 0; 1625 { 1626 llvm::SmallString<8> Str; 1627 llvm::raw_svector_ostream OS(Str); 1628 OS << "__i" << IndexVariables.size(); 1629 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1630 } 1631 VarDecl *IterationVar 1632 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1633 IterationVarName, SizeType, 1634 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1635 VarDecl::None, VarDecl::None); 1636 IndexVariables.push_back(IterationVar); 1637 1638 // Create a reference to the iteration variable. 1639 ExprResult IterationVarRef 1640 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1641 assert(!IterationVarRef.isInvalid() && 1642 "Reference to invented variable cannot fail!"); 1643 1644 // Subscript the array with this iteration variable. 1645 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1646 Loc, 1647 IterationVarRef.take(), 1648 Loc); 1649 if (CopyCtorArg.isInvalid()) 1650 return true; 1651 1652 BaseType = Array->getElementType(); 1653 } 1654 1655 // Construct the entity that we will be initializing. For an array, this 1656 // will be first element in the array, which may require several levels 1657 // of array-subscript entities. 1658 llvm::SmallVector<InitializedEntity, 4> Entities; 1659 Entities.reserve(1 + IndexVariables.size()); 1660 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1661 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1662 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1663 0, 1664 Entities.back())); 1665 1666 // Direct-initialize to use the copy constructor. 1667 InitializationKind InitKind = 1668 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1669 1670 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1671 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1672 &CopyCtorArgE, 1); 1673 1674 ExprResult MemberInit 1675 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1676 Sema::MultiExprArg(SemaRef, &CopyCtorArgE, 1)); 1677 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1678 if (MemberInit.isInvalid()) 1679 return true; 1680 1681 CXXMemberInit 1682 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1683 MemberInit.takeAs<Expr>(), Loc, 1684 IndexVariables.data(), 1685 IndexVariables.size()); 1686 return false; 1687 } 1688 1689 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1690 1691 QualType FieldBaseElementType = 1692 SemaRef.Context.getBaseElementType(Field->getType()); 1693 1694 if (FieldBaseElementType->isRecordType()) { 1695 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1696 InitializationKind InitKind = 1697 InitializationKind::CreateDefault(Loc); 1698 1699 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1700 ExprResult MemberInit = 1701 InitSeq.Perform(SemaRef, InitEntity, InitKind, 1702 Sema::MultiExprArg(SemaRef, 0, 0)); 1703 if (MemberInit.isInvalid()) 1704 return true; 1705 1706 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1707 if (MemberInit.isInvalid()) 1708 return true; 1709 1710 CXXMemberInit = 1711 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1712 Field, Loc, Loc, 1713 MemberInit.get(), 1714 Loc); 1715 return false; 1716 } 1717 1718 if (FieldBaseElementType->isReferenceType()) { 1719 SemaRef.Diag(Constructor->getLocation(), 1720 diag::err_uninitialized_member_in_ctor) 1721 << (int)Constructor->isImplicit() 1722 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1723 << 0 << Field->getDeclName(); 1724 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1725 return true; 1726 } 1727 1728 if (FieldBaseElementType.isConstQualified()) { 1729 SemaRef.Diag(Constructor->getLocation(), 1730 diag::err_uninitialized_member_in_ctor) 1731 << (int)Constructor->isImplicit() 1732 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1733 << 1 << Field->getDeclName(); 1734 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1735 return true; 1736 } 1737 1738 // Nothing to initialize. 1739 CXXMemberInit = 0; 1740 return false; 1741} 1742 1743namespace { 1744struct BaseAndFieldInfo { 1745 Sema &S; 1746 CXXConstructorDecl *Ctor; 1747 bool AnyErrorsInInits; 1748 ImplicitInitializerKind IIK; 1749 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1750 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1751 1752 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1753 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1754 // FIXME: Handle implicit move constructors. 1755 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1756 IIK = IIK_Copy; 1757 else 1758 IIK = IIK_Default; 1759 } 1760}; 1761} 1762 1763static void RecordFieldInitializer(BaseAndFieldInfo &Info, 1764 FieldDecl *Top, FieldDecl *Field, 1765 CXXBaseOrMemberInitializer *Init) { 1766 // If the member doesn't need to be initialized, Init will still be null. 1767 if (!Init) 1768 return; 1769 1770 Info.AllToInit.push_back(Init); 1771 if (Field != Top) { 1772 Init->setMember(Top); 1773 Init->setAnonUnionMember(Field); 1774 } 1775} 1776 1777static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1778 FieldDecl *Top, FieldDecl *Field) { 1779 1780 // Overwhelmingly common case: we have a direct initializer for this field. 1781 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1782 RecordFieldInitializer(Info, Top, Field, Init); 1783 return false; 1784 } 1785 1786 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1787 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1788 assert(FieldClassType && "anonymous struct/union without record type"); 1789 CXXRecordDecl *FieldClassDecl 1790 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1791 1792 // Even though union members never have non-trivial default 1793 // constructions in C++03, we still build member initializers for aggregate 1794 // record types which can be union members, and C++0x allows non-trivial 1795 // default constructors for union members, so we ensure that only one 1796 // member is initialized for these. 1797 if (FieldClassDecl->isUnion()) { 1798 // First check for an explicit initializer for one field. 1799 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1800 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1801 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1802 RecordFieldInitializer(Info, Top, *FA, Init); 1803 1804 // Once we've initialized a field of an anonymous union, the union 1805 // field in the class is also initialized, so exit immediately. 1806 return false; 1807 } else if ((*FA)->isAnonymousStructOrUnion()) { 1808 if (CollectFieldInitializer(Info, Top, *FA)) 1809 return true; 1810 } 1811 } 1812 1813 // Fallthrough and construct a default initializer for the union as 1814 // a whole, which can call its default constructor if such a thing exists 1815 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1816 // behavior going forward with C++0x, when anonymous unions there are 1817 // finalized, we should revisit this. 1818 } else { 1819 // For structs, we simply descend through to initialize all members where 1820 // necessary. 1821 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1822 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1823 if (CollectFieldInitializer(Info, Top, *FA)) 1824 return true; 1825 } 1826 } 1827 } 1828 1829 // Don't try to build an implicit initializer if there were semantic 1830 // errors in any of the initializers (and therefore we might be 1831 // missing some that the user actually wrote). 1832 if (Info.AnyErrorsInInits) 1833 return false; 1834 1835 CXXBaseOrMemberInitializer *Init = 0; 1836 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1837 return true; 1838 1839 RecordFieldInitializer(Info, Top, Field, Init); 1840 return false; 1841} 1842 1843bool 1844Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1845 CXXBaseOrMemberInitializer **Initializers, 1846 unsigned NumInitializers, 1847 bool AnyErrors) { 1848 if (Constructor->getDeclContext()->isDependentContext()) { 1849 // Just store the initializers as written, they will be checked during 1850 // instantiation. 1851 if (NumInitializers > 0) { 1852 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1853 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1854 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1855 memcpy(baseOrMemberInitializers, Initializers, 1856 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1857 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1858 } 1859 1860 return false; 1861 } 1862 1863 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1864 1865 // We need to build the initializer AST according to order of construction 1866 // and not what user specified in the Initializers list. 1867 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1868 if (!ClassDecl) 1869 return true; 1870 1871 bool HadError = false; 1872 1873 for (unsigned i = 0; i < NumInitializers; i++) { 1874 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1875 1876 if (Member->isBaseInitializer()) 1877 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1878 else 1879 Info.AllBaseFields[Member->getMember()] = Member; 1880 } 1881 1882 // Keep track of the direct virtual bases. 1883 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1884 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1885 E = ClassDecl->bases_end(); I != E; ++I) { 1886 if (I->isVirtual()) 1887 DirectVBases.insert(I); 1888 } 1889 1890 // Push virtual bases before others. 1891 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1892 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1893 1894 if (CXXBaseOrMemberInitializer *Value 1895 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1896 Info.AllToInit.push_back(Value); 1897 } else if (!AnyErrors) { 1898 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1899 CXXBaseOrMemberInitializer *CXXBaseInit; 1900 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1901 VBase, IsInheritedVirtualBase, 1902 CXXBaseInit)) { 1903 HadError = true; 1904 continue; 1905 } 1906 1907 Info.AllToInit.push_back(CXXBaseInit); 1908 } 1909 } 1910 1911 // Non-virtual bases. 1912 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1913 E = ClassDecl->bases_end(); Base != E; ++Base) { 1914 // Virtuals are in the virtual base list and already constructed. 1915 if (Base->isVirtual()) 1916 continue; 1917 1918 if (CXXBaseOrMemberInitializer *Value 1919 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1920 Info.AllToInit.push_back(Value); 1921 } else if (!AnyErrors) { 1922 CXXBaseOrMemberInitializer *CXXBaseInit; 1923 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1924 Base, /*IsInheritedVirtualBase=*/false, 1925 CXXBaseInit)) { 1926 HadError = true; 1927 continue; 1928 } 1929 1930 Info.AllToInit.push_back(CXXBaseInit); 1931 } 1932 } 1933 1934 // Fields. 1935 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1936 E = ClassDecl->field_end(); Field != E; ++Field) { 1937 if ((*Field)->getType()->isIncompleteArrayType()) { 1938 assert(ClassDecl->hasFlexibleArrayMember() && 1939 "Incomplete array type is not valid"); 1940 continue; 1941 } 1942 if (CollectFieldInitializer(Info, *Field, *Field)) 1943 HadError = true; 1944 } 1945 1946 NumInitializers = Info.AllToInit.size(); 1947 if (NumInitializers > 0) { 1948 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1949 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1950 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1951 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1952 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1953 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1954 1955 // Constructors implicitly reference the base and member 1956 // destructors. 1957 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1958 Constructor->getParent()); 1959 } 1960 1961 return HadError; 1962} 1963 1964static void *GetKeyForTopLevelField(FieldDecl *Field) { 1965 // For anonymous unions, use the class declaration as the key. 1966 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1967 if (RT->getDecl()->isAnonymousStructOrUnion()) 1968 return static_cast<void *>(RT->getDecl()); 1969 } 1970 return static_cast<void *>(Field); 1971} 1972 1973static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1974 return Context.getCanonicalType(BaseType).getTypePtr(); 1975} 1976 1977static void *GetKeyForMember(ASTContext &Context, 1978 CXXBaseOrMemberInitializer *Member, 1979 bool MemberMaybeAnon = false) { 1980 if (!Member->isMemberInitializer()) 1981 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1982 1983 // For fields injected into the class via declaration of an anonymous union, 1984 // use its anonymous union class declaration as the unique key. 1985 FieldDecl *Field = Member->getMember(); 1986 1987 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1988 // data member of the class. Data member used in the initializer list is 1989 // in AnonUnionMember field. 1990 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1991 Field = Member->getAnonUnionMember(); 1992 1993 // If the field is a member of an anonymous struct or union, our key 1994 // is the anonymous record decl that's a direct child of the class. 1995 RecordDecl *RD = Field->getParent(); 1996 if (RD->isAnonymousStructOrUnion()) { 1997 while (true) { 1998 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1999 if (Parent->isAnonymousStructOrUnion()) 2000 RD = Parent; 2001 else 2002 break; 2003 } 2004 2005 return static_cast<void *>(RD); 2006 } 2007 2008 return static_cast<void *>(Field); 2009} 2010 2011static void 2012DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2013 const CXXConstructorDecl *Constructor, 2014 CXXBaseOrMemberInitializer **Inits, 2015 unsigned NumInits) { 2016 if (Constructor->getDeclContext()->isDependentContext()) 2017 return; 2018 2019 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 2020 == Diagnostic::Ignored) 2021 return; 2022 2023 // Build the list of bases and members in the order that they'll 2024 // actually be initialized. The explicit initializers should be in 2025 // this same order but may be missing things. 2026 llvm::SmallVector<const void*, 32> IdealInitKeys; 2027 2028 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2029 2030 // 1. Virtual bases. 2031 for (CXXRecordDecl::base_class_const_iterator VBase = 2032 ClassDecl->vbases_begin(), 2033 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2034 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2035 2036 // 2. Non-virtual bases. 2037 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2038 E = ClassDecl->bases_end(); Base != E; ++Base) { 2039 if (Base->isVirtual()) 2040 continue; 2041 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2042 } 2043 2044 // 3. Direct fields. 2045 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2046 E = ClassDecl->field_end(); Field != E; ++Field) 2047 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2048 2049 unsigned NumIdealInits = IdealInitKeys.size(); 2050 unsigned IdealIndex = 0; 2051 2052 CXXBaseOrMemberInitializer *PrevInit = 0; 2053 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2054 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2055 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2056 2057 // Scan forward to try to find this initializer in the idealized 2058 // initializers list. 2059 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2060 if (InitKey == IdealInitKeys[IdealIndex]) 2061 break; 2062 2063 // If we didn't find this initializer, it must be because we 2064 // scanned past it on a previous iteration. That can only 2065 // happen if we're out of order; emit a warning. 2066 if (IdealIndex == NumIdealInits && PrevInit) { 2067 Sema::SemaDiagnosticBuilder D = 2068 SemaRef.Diag(PrevInit->getSourceLocation(), 2069 diag::warn_initializer_out_of_order); 2070 2071 if (PrevInit->isMemberInitializer()) 2072 D << 0 << PrevInit->getMember()->getDeclName(); 2073 else 2074 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2075 2076 if (Init->isMemberInitializer()) 2077 D << 0 << Init->getMember()->getDeclName(); 2078 else 2079 D << 1 << Init->getBaseClassInfo()->getType(); 2080 2081 // Move back to the initializer's location in the ideal list. 2082 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2083 if (InitKey == IdealInitKeys[IdealIndex]) 2084 break; 2085 2086 assert(IdealIndex != NumIdealInits && 2087 "initializer not found in initializer list"); 2088 } 2089 2090 PrevInit = Init; 2091 } 2092} 2093 2094namespace { 2095bool CheckRedundantInit(Sema &S, 2096 CXXBaseOrMemberInitializer *Init, 2097 CXXBaseOrMemberInitializer *&PrevInit) { 2098 if (!PrevInit) { 2099 PrevInit = Init; 2100 return false; 2101 } 2102 2103 if (FieldDecl *Field = Init->getMember()) 2104 S.Diag(Init->getSourceLocation(), 2105 diag::err_multiple_mem_initialization) 2106 << Field->getDeclName() 2107 << Init->getSourceRange(); 2108 else { 2109 Type *BaseClass = Init->getBaseClass(); 2110 assert(BaseClass && "neither field nor base"); 2111 S.Diag(Init->getSourceLocation(), 2112 diag::err_multiple_base_initialization) 2113 << QualType(BaseClass, 0) 2114 << Init->getSourceRange(); 2115 } 2116 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2117 << 0 << PrevInit->getSourceRange(); 2118 2119 return true; 2120} 2121 2122typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2123typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2124 2125bool CheckRedundantUnionInit(Sema &S, 2126 CXXBaseOrMemberInitializer *Init, 2127 RedundantUnionMap &Unions) { 2128 FieldDecl *Field = Init->getMember(); 2129 RecordDecl *Parent = Field->getParent(); 2130 if (!Parent->isAnonymousStructOrUnion()) 2131 return false; 2132 2133 NamedDecl *Child = Field; 2134 do { 2135 if (Parent->isUnion()) { 2136 UnionEntry &En = Unions[Parent]; 2137 if (En.first && En.first != Child) { 2138 S.Diag(Init->getSourceLocation(), 2139 diag::err_multiple_mem_union_initialization) 2140 << Field->getDeclName() 2141 << Init->getSourceRange(); 2142 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2143 << 0 << En.second->getSourceRange(); 2144 return true; 2145 } else if (!En.first) { 2146 En.first = Child; 2147 En.second = Init; 2148 } 2149 } 2150 2151 Child = Parent; 2152 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2153 } while (Parent->isAnonymousStructOrUnion()); 2154 2155 return false; 2156} 2157} 2158 2159/// ActOnMemInitializers - Handle the member initializers for a constructor. 2160void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2161 SourceLocation ColonLoc, 2162 MemInitTy **meminits, unsigned NumMemInits, 2163 bool AnyErrors) { 2164 if (!ConstructorDecl) 2165 return; 2166 2167 AdjustDeclIfTemplate(ConstructorDecl); 2168 2169 CXXConstructorDecl *Constructor 2170 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2171 2172 if (!Constructor) { 2173 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2174 return; 2175 } 2176 2177 CXXBaseOrMemberInitializer **MemInits = 2178 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2179 2180 // Mapping for the duplicate initializers check. 2181 // For member initializers, this is keyed with a FieldDecl*. 2182 // For base initializers, this is keyed with a Type*. 2183 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2184 2185 // Mapping for the inconsistent anonymous-union initializers check. 2186 RedundantUnionMap MemberUnions; 2187 2188 bool HadError = false; 2189 for (unsigned i = 0; i < NumMemInits; i++) { 2190 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2191 2192 // Set the source order index. 2193 Init->setSourceOrder(i); 2194 2195 if (Init->isMemberInitializer()) { 2196 FieldDecl *Field = Init->getMember(); 2197 if (CheckRedundantInit(*this, Init, Members[Field]) || 2198 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2199 HadError = true; 2200 } else { 2201 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2202 if (CheckRedundantInit(*this, Init, Members[Key])) 2203 HadError = true; 2204 } 2205 } 2206 2207 if (HadError) 2208 return; 2209 2210 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2211 2212 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2213} 2214 2215void 2216Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2217 CXXRecordDecl *ClassDecl) { 2218 // Ignore dependent contexts. 2219 if (ClassDecl->isDependentContext()) 2220 return; 2221 2222 // FIXME: all the access-control diagnostics are positioned on the 2223 // field/base declaration. That's probably good; that said, the 2224 // user might reasonably want to know why the destructor is being 2225 // emitted, and we currently don't say. 2226 2227 // Non-static data members. 2228 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2229 E = ClassDecl->field_end(); I != E; ++I) { 2230 FieldDecl *Field = *I; 2231 if (Field->isInvalidDecl()) 2232 continue; 2233 QualType FieldType = Context.getBaseElementType(Field->getType()); 2234 2235 const RecordType* RT = FieldType->getAs<RecordType>(); 2236 if (!RT) 2237 continue; 2238 2239 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2240 if (FieldClassDecl->hasTrivialDestructor()) 2241 continue; 2242 2243 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2244 CheckDestructorAccess(Field->getLocation(), Dtor, 2245 PDiag(diag::err_access_dtor_field) 2246 << Field->getDeclName() 2247 << FieldType); 2248 2249 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2250 } 2251 2252 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2253 2254 // Bases. 2255 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2256 E = ClassDecl->bases_end(); Base != E; ++Base) { 2257 // Bases are always records in a well-formed non-dependent class. 2258 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2259 2260 // Remember direct virtual bases. 2261 if (Base->isVirtual()) 2262 DirectVirtualBases.insert(RT); 2263 2264 // Ignore trivial destructors. 2265 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2266 if (BaseClassDecl->hasTrivialDestructor()) 2267 continue; 2268 2269 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2270 2271 // FIXME: caret should be on the start of the class name 2272 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2273 PDiag(diag::err_access_dtor_base) 2274 << Base->getType() 2275 << Base->getSourceRange()); 2276 2277 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2278 } 2279 2280 // Virtual bases. 2281 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2282 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2283 2284 // Bases are always records in a well-formed non-dependent class. 2285 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2286 2287 // Ignore direct virtual bases. 2288 if (DirectVirtualBases.count(RT)) 2289 continue; 2290 2291 // Ignore trivial destructors. 2292 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2293 if (BaseClassDecl->hasTrivialDestructor()) 2294 continue; 2295 2296 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2297 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2298 PDiag(diag::err_access_dtor_vbase) 2299 << VBase->getType()); 2300 2301 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2302 } 2303} 2304 2305void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2306 if (!CDtorDecl) 2307 return; 2308 2309 if (CXXConstructorDecl *Constructor 2310 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2311 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2312} 2313 2314bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2315 unsigned DiagID, AbstractDiagSelID SelID) { 2316 if (SelID == -1) 2317 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2318 else 2319 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2320} 2321 2322bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2323 const PartialDiagnostic &PD) { 2324 if (!getLangOptions().CPlusPlus) 2325 return false; 2326 2327 if (const ArrayType *AT = Context.getAsArrayType(T)) 2328 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2329 2330 if (const PointerType *PT = T->getAs<PointerType>()) { 2331 // Find the innermost pointer type. 2332 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2333 PT = T; 2334 2335 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2336 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2337 } 2338 2339 const RecordType *RT = T->getAs<RecordType>(); 2340 if (!RT) 2341 return false; 2342 2343 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2344 2345 // We can't answer whether something is abstract until it has a 2346 // definition. If it's currently being defined, we'll walk back 2347 // over all the declarations when we have a full definition. 2348 const CXXRecordDecl *Def = RD->getDefinition(); 2349 if (!Def || Def->isBeingDefined()) 2350 return false; 2351 2352 if (!RD->isAbstract()) 2353 return false; 2354 2355 Diag(Loc, PD) << RD->getDeclName(); 2356 DiagnoseAbstractType(RD); 2357 2358 return true; 2359} 2360 2361void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2362 // Check if we've already emitted the list of pure virtual functions 2363 // for this class. 2364 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2365 return; 2366 2367 CXXFinalOverriderMap FinalOverriders; 2368 RD->getFinalOverriders(FinalOverriders); 2369 2370 // Keep a set of seen pure methods so we won't diagnose the same method 2371 // more than once. 2372 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2373 2374 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2375 MEnd = FinalOverriders.end(); 2376 M != MEnd; 2377 ++M) { 2378 for (OverridingMethods::iterator SO = M->second.begin(), 2379 SOEnd = M->second.end(); 2380 SO != SOEnd; ++SO) { 2381 // C++ [class.abstract]p4: 2382 // A class is abstract if it contains or inherits at least one 2383 // pure virtual function for which the final overrider is pure 2384 // virtual. 2385 2386 // 2387 if (SO->second.size() != 1) 2388 continue; 2389 2390 if (!SO->second.front().Method->isPure()) 2391 continue; 2392 2393 if (!SeenPureMethods.insert(SO->second.front().Method)) 2394 continue; 2395 2396 Diag(SO->second.front().Method->getLocation(), 2397 diag::note_pure_virtual_function) 2398 << SO->second.front().Method->getDeclName(); 2399 } 2400 } 2401 2402 if (!PureVirtualClassDiagSet) 2403 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2404 PureVirtualClassDiagSet->insert(RD); 2405} 2406 2407namespace { 2408struct AbstractUsageInfo { 2409 Sema &S; 2410 CXXRecordDecl *Record; 2411 CanQualType AbstractType; 2412 bool Invalid; 2413 2414 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2415 : S(S), Record(Record), 2416 AbstractType(S.Context.getCanonicalType( 2417 S.Context.getTypeDeclType(Record))), 2418 Invalid(false) {} 2419 2420 void DiagnoseAbstractType() { 2421 if (Invalid) return; 2422 S.DiagnoseAbstractType(Record); 2423 Invalid = true; 2424 } 2425 2426 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2427}; 2428 2429struct CheckAbstractUsage { 2430 AbstractUsageInfo &Info; 2431 const NamedDecl *Ctx; 2432 2433 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2434 : Info(Info), Ctx(Ctx) {} 2435 2436 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2437 switch (TL.getTypeLocClass()) { 2438#define ABSTRACT_TYPELOC(CLASS, PARENT) 2439#define TYPELOC(CLASS, PARENT) \ 2440 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2441#include "clang/AST/TypeLocNodes.def" 2442 } 2443 } 2444 2445 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2446 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2447 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2448 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2449 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2450 } 2451 } 2452 2453 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2454 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2455 } 2456 2457 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2458 // Visit the type parameters from a permissive context. 2459 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2460 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2461 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2462 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2463 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2464 // TODO: other template argument types? 2465 } 2466 } 2467 2468 // Visit pointee types from a permissive context. 2469#define CheckPolymorphic(Type) \ 2470 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2471 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2472 } 2473 CheckPolymorphic(PointerTypeLoc) 2474 CheckPolymorphic(ReferenceTypeLoc) 2475 CheckPolymorphic(MemberPointerTypeLoc) 2476 CheckPolymorphic(BlockPointerTypeLoc) 2477 2478 /// Handle all the types we haven't given a more specific 2479 /// implementation for above. 2480 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2481 // Every other kind of type that we haven't called out already 2482 // that has an inner type is either (1) sugar or (2) contains that 2483 // inner type in some way as a subobject. 2484 if (TypeLoc Next = TL.getNextTypeLoc()) 2485 return Visit(Next, Sel); 2486 2487 // If there's no inner type and we're in a permissive context, 2488 // don't diagnose. 2489 if (Sel == Sema::AbstractNone) return; 2490 2491 // Check whether the type matches the abstract type. 2492 QualType T = TL.getType(); 2493 if (T->isArrayType()) { 2494 Sel = Sema::AbstractArrayType; 2495 T = Info.S.Context.getBaseElementType(T); 2496 } 2497 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2498 if (CT != Info.AbstractType) return; 2499 2500 // It matched; do some magic. 2501 if (Sel == Sema::AbstractArrayType) { 2502 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2503 << T << TL.getSourceRange(); 2504 } else { 2505 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2506 << Sel << T << TL.getSourceRange(); 2507 } 2508 Info.DiagnoseAbstractType(); 2509 } 2510}; 2511 2512void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2513 Sema::AbstractDiagSelID Sel) { 2514 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2515} 2516 2517} 2518 2519/// Check for invalid uses of an abstract type in a method declaration. 2520static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2521 CXXMethodDecl *MD) { 2522 // No need to do the check on definitions, which require that 2523 // the return/param types be complete. 2524 if (MD->isThisDeclarationADefinition()) 2525 return; 2526 2527 // For safety's sake, just ignore it if we don't have type source 2528 // information. This should never happen for non-implicit methods, 2529 // but... 2530 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2531 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2532} 2533 2534/// Check for invalid uses of an abstract type within a class definition. 2535static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2536 CXXRecordDecl *RD) { 2537 for (CXXRecordDecl::decl_iterator 2538 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2539 Decl *D = *I; 2540 if (D->isImplicit()) continue; 2541 2542 // Methods and method templates. 2543 if (isa<CXXMethodDecl>(D)) { 2544 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2545 } else if (isa<FunctionTemplateDecl>(D)) { 2546 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2547 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2548 2549 // Fields and static variables. 2550 } else if (isa<FieldDecl>(D)) { 2551 FieldDecl *FD = cast<FieldDecl>(D); 2552 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2553 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2554 } else if (isa<VarDecl>(D)) { 2555 VarDecl *VD = cast<VarDecl>(D); 2556 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2557 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2558 2559 // Nested classes and class templates. 2560 } else if (isa<CXXRecordDecl>(D)) { 2561 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2562 } else if (isa<ClassTemplateDecl>(D)) { 2563 CheckAbstractClassUsage(Info, 2564 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2565 } 2566 } 2567} 2568 2569/// \brief Perform semantic checks on a class definition that has been 2570/// completing, introducing implicitly-declared members, checking for 2571/// abstract types, etc. 2572void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2573 if (!Record || Record->isInvalidDecl()) 2574 return; 2575 2576 if (!Record->isDependentType()) 2577 AddImplicitlyDeclaredMembersToClass(Record); 2578 2579 if (Record->isInvalidDecl()) 2580 return; 2581 2582 // Set access bits correctly on the directly-declared conversions. 2583 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2584 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2585 Convs->setAccess(I, (*I)->getAccess()); 2586 2587 // Determine whether we need to check for final overriders. We do 2588 // this either when there are virtual base classes (in which case we 2589 // may end up finding multiple final overriders for a given virtual 2590 // function) or any of the base classes is abstract (in which case 2591 // we might detect that this class is abstract). 2592 bool CheckFinalOverriders = false; 2593 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2594 !Record->isDependentType()) { 2595 if (Record->getNumVBases()) 2596 CheckFinalOverriders = true; 2597 else if (!Record->isAbstract()) { 2598 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2599 BEnd = Record->bases_end(); 2600 B != BEnd; ++B) { 2601 CXXRecordDecl *BaseDecl 2602 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2603 if (BaseDecl->isAbstract()) { 2604 CheckFinalOverriders = true; 2605 break; 2606 } 2607 } 2608 } 2609 } 2610 2611 if (CheckFinalOverriders) { 2612 CXXFinalOverriderMap FinalOverriders; 2613 Record->getFinalOverriders(FinalOverriders); 2614 2615 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2616 MEnd = FinalOverriders.end(); 2617 M != MEnd; ++M) { 2618 for (OverridingMethods::iterator SO = M->second.begin(), 2619 SOEnd = M->second.end(); 2620 SO != SOEnd; ++SO) { 2621 assert(SO->second.size() > 0 && 2622 "All virtual functions have overridding virtual functions"); 2623 if (SO->second.size() == 1) { 2624 // C++ [class.abstract]p4: 2625 // A class is abstract if it contains or inherits at least one 2626 // pure virtual function for which the final overrider is pure 2627 // virtual. 2628 if (SO->second.front().Method->isPure()) 2629 Record->setAbstract(true); 2630 continue; 2631 } 2632 2633 // C++ [class.virtual]p2: 2634 // In a derived class, if a virtual member function of a base 2635 // class subobject has more than one final overrider the 2636 // program is ill-formed. 2637 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2638 << (NamedDecl *)M->first << Record; 2639 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2640 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2641 OMEnd = SO->second.end(); 2642 OM != OMEnd; ++OM) 2643 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2644 << (NamedDecl *)M->first << OM->Method->getParent(); 2645 2646 Record->setInvalidDecl(); 2647 } 2648 } 2649 } 2650 2651 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2652 AbstractUsageInfo Info(*this, Record); 2653 CheckAbstractClassUsage(Info, Record); 2654 } 2655 2656 // If this is not an aggregate type and has no user-declared constructor, 2657 // complain about any non-static data members of reference or const scalar 2658 // type, since they will never get initializers. 2659 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2660 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2661 bool Complained = false; 2662 for (RecordDecl::field_iterator F = Record->field_begin(), 2663 FEnd = Record->field_end(); 2664 F != FEnd; ++F) { 2665 if (F->getType()->isReferenceType() || 2666 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2667 if (!Complained) { 2668 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2669 << Record->getTagKind() << Record; 2670 Complained = true; 2671 } 2672 2673 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2674 << F->getType()->isReferenceType() 2675 << F->getDeclName(); 2676 } 2677 } 2678 } 2679 2680 if (Record->isDynamicClass()) 2681 DynamicClasses.push_back(Record); 2682} 2683 2684void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2685 Decl *TagDecl, 2686 SourceLocation LBrac, 2687 SourceLocation RBrac, 2688 AttributeList *AttrList) { 2689 if (!TagDecl) 2690 return; 2691 2692 AdjustDeclIfTemplate(TagDecl); 2693 2694 ActOnFields(S, RLoc, TagDecl, 2695 // strict aliasing violation! 2696 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 2697 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2698 2699 CheckCompletedCXXClass( 2700 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 2701} 2702 2703namespace { 2704 /// \brief Helper class that collects exception specifications for 2705 /// implicitly-declared special member functions. 2706 class ImplicitExceptionSpecification { 2707 ASTContext &Context; 2708 bool AllowsAllExceptions; 2709 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2710 llvm::SmallVector<QualType, 4> Exceptions; 2711 2712 public: 2713 explicit ImplicitExceptionSpecification(ASTContext &Context) 2714 : Context(Context), AllowsAllExceptions(false) { } 2715 2716 /// \brief Whether the special member function should have any 2717 /// exception specification at all. 2718 bool hasExceptionSpecification() const { 2719 return !AllowsAllExceptions; 2720 } 2721 2722 /// \brief Whether the special member function should have a 2723 /// throw(...) exception specification (a Microsoft extension). 2724 bool hasAnyExceptionSpecification() const { 2725 return false; 2726 } 2727 2728 /// \brief The number of exceptions in the exception specification. 2729 unsigned size() const { return Exceptions.size(); } 2730 2731 /// \brief The set of exceptions in the exception specification. 2732 const QualType *data() const { return Exceptions.data(); } 2733 2734 /// \brief Note that 2735 void CalledDecl(CXXMethodDecl *Method) { 2736 // If we already know that we allow all exceptions, do nothing. 2737 if (AllowsAllExceptions || !Method) 2738 return; 2739 2740 const FunctionProtoType *Proto 2741 = Method->getType()->getAs<FunctionProtoType>(); 2742 2743 // If this function can throw any exceptions, make a note of that. 2744 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2745 AllowsAllExceptions = true; 2746 ExceptionsSeen.clear(); 2747 Exceptions.clear(); 2748 return; 2749 } 2750 2751 // Record the exceptions in this function's exception specification. 2752 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2753 EEnd = Proto->exception_end(); 2754 E != EEnd; ++E) 2755 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2756 Exceptions.push_back(*E); 2757 } 2758 }; 2759} 2760 2761 2762/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2763/// special functions, such as the default constructor, copy 2764/// constructor, or destructor, to the given C++ class (C++ 2765/// [special]p1). This routine can only be executed just before the 2766/// definition of the class is complete. 2767void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2768 if (!ClassDecl->hasUserDeclaredConstructor()) 2769 ++ASTContext::NumImplicitDefaultConstructors; 2770 2771 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2772 ++ASTContext::NumImplicitCopyConstructors; 2773 2774 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2775 ++ASTContext::NumImplicitCopyAssignmentOperators; 2776 2777 // If we have a dynamic class, then the copy assignment operator may be 2778 // virtual, so we have to declare it immediately. This ensures that, e.g., 2779 // it shows up in the right place in the vtable and that we diagnose 2780 // problems with the implicit exception specification. 2781 if (ClassDecl->isDynamicClass()) 2782 DeclareImplicitCopyAssignment(ClassDecl); 2783 } 2784 2785 if (!ClassDecl->hasUserDeclaredDestructor()) { 2786 ++ASTContext::NumImplicitDestructors; 2787 2788 // If we have a dynamic class, then the destructor may be virtual, so we 2789 // have to declare the destructor immediately. This ensures that, e.g., it 2790 // shows up in the right place in the vtable and that we diagnose problems 2791 // with the implicit exception specification. 2792 if (ClassDecl->isDynamicClass()) 2793 DeclareImplicitDestructor(ClassDecl); 2794 } 2795} 2796 2797void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 2798 if (!D) 2799 return; 2800 2801 TemplateParameterList *Params = 0; 2802 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2803 Params = Template->getTemplateParameters(); 2804 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2805 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2806 Params = PartialSpec->getTemplateParameters(); 2807 else 2808 return; 2809 2810 for (TemplateParameterList::iterator Param = Params->begin(), 2811 ParamEnd = Params->end(); 2812 Param != ParamEnd; ++Param) { 2813 NamedDecl *Named = cast<NamedDecl>(*Param); 2814 if (Named->getDeclName()) { 2815 S->AddDecl(Named); 2816 IdResolver.AddDecl(Named); 2817 } 2818 } 2819} 2820 2821void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2822 if (!RecordD) return; 2823 AdjustDeclIfTemplate(RecordD); 2824 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 2825 PushDeclContext(S, Record); 2826} 2827 2828void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2829 if (!RecordD) return; 2830 PopDeclContext(); 2831} 2832 2833/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2834/// parsing a top-level (non-nested) C++ class, and we are now 2835/// parsing those parts of the given Method declaration that could 2836/// not be parsed earlier (C++ [class.mem]p2), such as default 2837/// arguments. This action should enter the scope of the given 2838/// Method declaration as if we had just parsed the qualified method 2839/// name. However, it should not bring the parameters into scope; 2840/// that will be performed by ActOnDelayedCXXMethodParameter. 2841void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2842} 2843 2844/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2845/// C++ method declaration. We're (re-)introducing the given 2846/// function parameter into scope for use in parsing later parts of 2847/// the method declaration. For example, we could see an 2848/// ActOnParamDefaultArgument event for this parameter. 2849void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 2850 if (!ParamD) 2851 return; 2852 2853 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 2854 2855 // If this parameter has an unparsed default argument, clear it out 2856 // to make way for the parsed default argument. 2857 if (Param->hasUnparsedDefaultArg()) 2858 Param->setDefaultArg(0); 2859 2860 S->AddDecl(Param); 2861 if (Param->getDeclName()) 2862 IdResolver.AddDecl(Param); 2863} 2864 2865/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2866/// processing the delayed method declaration for Method. The method 2867/// declaration is now considered finished. There may be a separate 2868/// ActOnStartOfFunctionDef action later (not necessarily 2869/// immediately!) for this method, if it was also defined inside the 2870/// class body. 2871void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2872 if (!MethodD) 2873 return; 2874 2875 AdjustDeclIfTemplate(MethodD); 2876 2877 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 2878 2879 // Now that we have our default arguments, check the constructor 2880 // again. It could produce additional diagnostics or affect whether 2881 // the class has implicitly-declared destructors, among other 2882 // things. 2883 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2884 CheckConstructor(Constructor); 2885 2886 // Check the default arguments, which we may have added. 2887 if (!Method->isInvalidDecl()) 2888 CheckCXXDefaultArguments(Method); 2889} 2890 2891/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2892/// the well-formedness of the constructor declarator @p D with type @p 2893/// R. If there are any errors in the declarator, this routine will 2894/// emit diagnostics and set the invalid bit to true. In any case, the type 2895/// will be updated to reflect a well-formed type for the constructor and 2896/// returned. 2897QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2898 FunctionDecl::StorageClass &SC) { 2899 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2900 2901 // C++ [class.ctor]p3: 2902 // A constructor shall not be virtual (10.3) or static (9.4). A 2903 // constructor can be invoked for a const, volatile or const 2904 // volatile object. A constructor shall not be declared const, 2905 // volatile, or const volatile (9.3.2). 2906 if (isVirtual) { 2907 if (!D.isInvalidType()) 2908 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2909 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2910 << SourceRange(D.getIdentifierLoc()); 2911 D.setInvalidType(); 2912 } 2913 if (SC == FunctionDecl::Static) { 2914 if (!D.isInvalidType()) 2915 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2916 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2917 << SourceRange(D.getIdentifierLoc()); 2918 D.setInvalidType(); 2919 SC = FunctionDecl::None; 2920 } 2921 2922 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2923 if (FTI.TypeQuals != 0) { 2924 if (FTI.TypeQuals & Qualifiers::Const) 2925 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2926 << "const" << SourceRange(D.getIdentifierLoc()); 2927 if (FTI.TypeQuals & Qualifiers::Volatile) 2928 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2929 << "volatile" << SourceRange(D.getIdentifierLoc()); 2930 if (FTI.TypeQuals & Qualifiers::Restrict) 2931 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2932 << "restrict" << SourceRange(D.getIdentifierLoc()); 2933 } 2934 2935 // Rebuild the function type "R" without any type qualifiers (in 2936 // case any of the errors above fired) and with "void" as the 2937 // return type, since constructors don't have return types. 2938 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2939 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2940 Proto->getNumArgs(), 2941 Proto->isVariadic(), 0, 2942 Proto->hasExceptionSpec(), 2943 Proto->hasAnyExceptionSpec(), 2944 Proto->getNumExceptions(), 2945 Proto->exception_begin(), 2946 Proto->getExtInfo()); 2947} 2948 2949/// CheckConstructor - Checks a fully-formed constructor for 2950/// well-formedness, issuing any diagnostics required. Returns true if 2951/// the constructor declarator is invalid. 2952void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2953 CXXRecordDecl *ClassDecl 2954 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2955 if (!ClassDecl) 2956 return Constructor->setInvalidDecl(); 2957 2958 // C++ [class.copy]p3: 2959 // A declaration of a constructor for a class X is ill-formed if 2960 // its first parameter is of type (optionally cv-qualified) X and 2961 // either there are no other parameters or else all other 2962 // parameters have default arguments. 2963 if (!Constructor->isInvalidDecl() && 2964 ((Constructor->getNumParams() == 1) || 2965 (Constructor->getNumParams() > 1 && 2966 Constructor->getParamDecl(1)->hasDefaultArg())) && 2967 Constructor->getTemplateSpecializationKind() 2968 != TSK_ImplicitInstantiation) { 2969 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2970 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2971 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2972 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2973 const char *ConstRef 2974 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2975 : " const &"; 2976 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2977 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 2978 2979 // FIXME: Rather that making the constructor invalid, we should endeavor 2980 // to fix the type. 2981 Constructor->setInvalidDecl(); 2982 } 2983 } 2984 2985 // Notify the class that we've added a constructor. In principle we 2986 // don't need to do this for out-of-line declarations; in practice 2987 // we only instantiate the most recent declaration of a method, so 2988 // we have to call this for everything but friends. 2989 if (!Constructor->getFriendObjectKind()) 2990 ClassDecl->addedConstructor(Context, Constructor); 2991} 2992 2993/// CheckDestructor - Checks a fully-formed destructor definition for 2994/// well-formedness, issuing any diagnostics required. Returns true 2995/// on error. 2996bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2997 CXXRecordDecl *RD = Destructor->getParent(); 2998 2999 if (Destructor->isVirtual()) { 3000 SourceLocation Loc; 3001 3002 if (!Destructor->isImplicit()) 3003 Loc = Destructor->getLocation(); 3004 else 3005 Loc = RD->getLocation(); 3006 3007 // If we have a virtual destructor, look up the deallocation function 3008 FunctionDecl *OperatorDelete = 0; 3009 DeclarationName Name = 3010 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3011 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3012 return true; 3013 3014 MarkDeclarationReferenced(Loc, OperatorDelete); 3015 3016 Destructor->setOperatorDelete(OperatorDelete); 3017 } 3018 3019 return false; 3020} 3021 3022static inline bool 3023FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3024 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3025 FTI.ArgInfo[0].Param && 3026 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 3027} 3028 3029/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3030/// the well-formednes of the destructor declarator @p D with type @p 3031/// R. If there are any errors in the declarator, this routine will 3032/// emit diagnostics and set the declarator to invalid. Even if this happens, 3033/// will be updated to reflect a well-formed type for the destructor and 3034/// returned. 3035QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3036 FunctionDecl::StorageClass& SC) { 3037 // C++ [class.dtor]p1: 3038 // [...] A typedef-name that names a class is a class-name 3039 // (7.1.3); however, a typedef-name that names a class shall not 3040 // be used as the identifier in the declarator for a destructor 3041 // declaration. 3042 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3043 if (isa<TypedefType>(DeclaratorType)) 3044 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3045 << DeclaratorType; 3046 3047 // C++ [class.dtor]p2: 3048 // A destructor is used to destroy objects of its class type. A 3049 // destructor takes no parameters, and no return type can be 3050 // specified for it (not even void). The address of a destructor 3051 // shall not be taken. A destructor shall not be static. A 3052 // destructor can be invoked for a const, volatile or const 3053 // volatile object. A destructor shall not be declared const, 3054 // volatile or const volatile (9.3.2). 3055 if (SC == FunctionDecl::Static) { 3056 if (!D.isInvalidType()) 3057 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3058 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3059 << SourceRange(D.getIdentifierLoc()) 3060 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3061 3062 SC = FunctionDecl::None; 3063 } 3064 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3065 // Destructors don't have return types, but the parser will 3066 // happily parse something like: 3067 // 3068 // class X { 3069 // float ~X(); 3070 // }; 3071 // 3072 // The return type will be eliminated later. 3073 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3074 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3075 << SourceRange(D.getIdentifierLoc()); 3076 } 3077 3078 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3079 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3080 if (FTI.TypeQuals & Qualifiers::Const) 3081 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3082 << "const" << SourceRange(D.getIdentifierLoc()); 3083 if (FTI.TypeQuals & Qualifiers::Volatile) 3084 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3085 << "volatile" << SourceRange(D.getIdentifierLoc()); 3086 if (FTI.TypeQuals & Qualifiers::Restrict) 3087 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3088 << "restrict" << SourceRange(D.getIdentifierLoc()); 3089 D.setInvalidType(); 3090 } 3091 3092 // Make sure we don't have any parameters. 3093 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3094 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3095 3096 // Delete the parameters. 3097 FTI.freeArgs(); 3098 D.setInvalidType(); 3099 } 3100 3101 // Make sure the destructor isn't variadic. 3102 if (FTI.isVariadic) { 3103 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3104 D.setInvalidType(); 3105 } 3106 3107 // Rebuild the function type "R" without any type qualifiers or 3108 // parameters (in case any of the errors above fired) and with 3109 // "void" as the return type, since destructors don't have return 3110 // types. 3111 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3112 if (!Proto) 3113 return QualType(); 3114 3115 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3116 Proto->hasExceptionSpec(), 3117 Proto->hasAnyExceptionSpec(), 3118 Proto->getNumExceptions(), 3119 Proto->exception_begin(), 3120 Proto->getExtInfo()); 3121} 3122 3123/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3124/// well-formednes of the conversion function declarator @p D with 3125/// type @p R. If there are any errors in the declarator, this routine 3126/// will emit diagnostics and return true. Otherwise, it will return 3127/// false. Either way, the type @p R will be updated to reflect a 3128/// well-formed type for the conversion operator. 3129void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3130 FunctionDecl::StorageClass& SC) { 3131 // C++ [class.conv.fct]p1: 3132 // Neither parameter types nor return type can be specified. The 3133 // type of a conversion function (8.3.5) is "function taking no 3134 // parameter returning conversion-type-id." 3135 if (SC == FunctionDecl::Static) { 3136 if (!D.isInvalidType()) 3137 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3138 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3139 << SourceRange(D.getIdentifierLoc()); 3140 D.setInvalidType(); 3141 SC = FunctionDecl::None; 3142 } 3143 3144 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3145 3146 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3147 // Conversion functions don't have return types, but the parser will 3148 // happily parse something like: 3149 // 3150 // class X { 3151 // float operator bool(); 3152 // }; 3153 // 3154 // The return type will be changed later anyway. 3155 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3156 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3157 << SourceRange(D.getIdentifierLoc()); 3158 D.setInvalidType(); 3159 } 3160 3161 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3162 3163 // Make sure we don't have any parameters. 3164 if (Proto->getNumArgs() > 0) { 3165 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3166 3167 // Delete the parameters. 3168 D.getTypeObject(0).Fun.freeArgs(); 3169 D.setInvalidType(); 3170 } else if (Proto->isVariadic()) { 3171 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3172 D.setInvalidType(); 3173 } 3174 3175 // Diagnose "&operator bool()" and other such nonsense. This 3176 // is actually a gcc extension which we don't support. 3177 if (Proto->getResultType() != ConvType) { 3178 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3179 << Proto->getResultType(); 3180 D.setInvalidType(); 3181 ConvType = Proto->getResultType(); 3182 } 3183 3184 // C++ [class.conv.fct]p4: 3185 // The conversion-type-id shall not represent a function type nor 3186 // an array type. 3187 if (ConvType->isArrayType()) { 3188 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3189 ConvType = Context.getPointerType(ConvType); 3190 D.setInvalidType(); 3191 } else if (ConvType->isFunctionType()) { 3192 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3193 ConvType = Context.getPointerType(ConvType); 3194 D.setInvalidType(); 3195 } 3196 3197 // Rebuild the function type "R" without any parameters (in case any 3198 // of the errors above fired) and with the conversion type as the 3199 // return type. 3200 if (D.isInvalidType()) { 3201 R = Context.getFunctionType(ConvType, 0, 0, false, 3202 Proto->getTypeQuals(), 3203 Proto->hasExceptionSpec(), 3204 Proto->hasAnyExceptionSpec(), 3205 Proto->getNumExceptions(), 3206 Proto->exception_begin(), 3207 Proto->getExtInfo()); 3208 } 3209 3210 // C++0x explicit conversion operators. 3211 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3212 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3213 diag::warn_explicit_conversion_functions) 3214 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3215} 3216 3217/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3218/// the declaration of the given C++ conversion function. This routine 3219/// is responsible for recording the conversion function in the C++ 3220/// class, if possible. 3221Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3222 assert(Conversion && "Expected to receive a conversion function declaration"); 3223 3224 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3225 3226 // Make sure we aren't redeclaring the conversion function. 3227 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3228 3229 // C++ [class.conv.fct]p1: 3230 // [...] A conversion function is never used to convert a 3231 // (possibly cv-qualified) object to the (possibly cv-qualified) 3232 // same object type (or a reference to it), to a (possibly 3233 // cv-qualified) base class of that type (or a reference to it), 3234 // or to (possibly cv-qualified) void. 3235 // FIXME: Suppress this warning if the conversion function ends up being a 3236 // virtual function that overrides a virtual function in a base class. 3237 QualType ClassType 3238 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3239 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3240 ConvType = ConvTypeRef->getPointeeType(); 3241 if (ConvType->isRecordType()) { 3242 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3243 if (ConvType == ClassType) 3244 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3245 << ClassType; 3246 else if (IsDerivedFrom(ClassType, ConvType)) 3247 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3248 << ClassType << ConvType; 3249 } else if (ConvType->isVoidType()) { 3250 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3251 << ClassType << ConvType; 3252 } 3253 3254 if (Conversion->getPrimaryTemplate()) { 3255 // ignore specializations 3256 } else if (Conversion->getPreviousDeclaration()) { 3257 if (FunctionTemplateDecl *ConversionTemplate 3258 = Conversion->getDescribedFunctionTemplate()) { 3259 if (ClassDecl->replaceConversion( 3260 ConversionTemplate->getPreviousDeclaration(), 3261 ConversionTemplate)) 3262 return ConversionTemplate; 3263 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3264 Conversion)) 3265 return Conversion; 3266 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3267 } else if (FunctionTemplateDecl *ConversionTemplate 3268 = Conversion->getDescribedFunctionTemplate()) 3269 ClassDecl->addConversionFunction(ConversionTemplate); 3270 else 3271 ClassDecl->addConversionFunction(Conversion); 3272 3273 return Conversion; 3274} 3275 3276//===----------------------------------------------------------------------===// 3277// Namespace Handling 3278//===----------------------------------------------------------------------===// 3279 3280/// ActOnStartNamespaceDef - This is called at the start of a namespace 3281/// definition. 3282Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3283 SourceLocation IdentLoc, 3284 IdentifierInfo *II, 3285 SourceLocation LBrace, 3286 AttributeList *AttrList) { 3287 // anonymous namespace starts at its left brace 3288 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3289 (II ? IdentLoc : LBrace) , II); 3290 Namespc->setLBracLoc(LBrace); 3291 3292 Scope *DeclRegionScope = NamespcScope->getParent(); 3293 3294 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3295 3296 if (const VisibilityAttr *attr = Namespc->getAttr<VisibilityAttr>()) 3297 PushPragmaVisibility(attr->getVisibility(), attr->getLocation()); 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 // Attach this namespace decl to the chain of extended namespace 3314 // definitions. 3315 OrigNS->setNextNamespace(Namespc); 3316 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3317 3318 // Remove the previous declaration from the scope. 3319 if (DeclRegionScope->isDeclScope(OrigNS)) { 3320 IdResolver.RemoveDecl(OrigNS); 3321 DeclRegionScope->RemoveDecl(OrigNS); 3322 } 3323 } else if (PrevDecl) { 3324 // This is an invalid name redefinition. 3325 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3326 << Namespc->getDeclName(); 3327 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3328 Namespc->setInvalidDecl(); 3329 // Continue on to push Namespc as current DeclContext and return it. 3330 } else if (II->isStr("std") && 3331 CurContext->getLookupContext()->isTranslationUnit()) { 3332 // This is the first "real" definition of the namespace "std", so update 3333 // our cache of the "std" namespace to point at this definition. 3334 if (NamespaceDecl *StdNS = getStdNamespace()) { 3335 // We had already defined a dummy namespace "std". Link this new 3336 // namespace definition to the dummy namespace "std". 3337 StdNS->setNextNamespace(Namespc); 3338 StdNS->setLocation(IdentLoc); 3339 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3340 } 3341 3342 // Make our StdNamespace cache point at the first real definition of the 3343 // "std" namespace. 3344 StdNamespace = Namespc; 3345 } 3346 3347 PushOnScopeChains(Namespc, DeclRegionScope); 3348 } else { 3349 // Anonymous namespaces. 3350 assert(Namespc->isAnonymousNamespace()); 3351 3352 // Link the anonymous namespace into its parent. 3353 NamespaceDecl *PrevDecl; 3354 DeclContext *Parent = CurContext->getLookupContext(); 3355 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3356 PrevDecl = TU->getAnonymousNamespace(); 3357 TU->setAnonymousNamespace(Namespc); 3358 } else { 3359 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3360 PrevDecl = ND->getAnonymousNamespace(); 3361 ND->setAnonymousNamespace(Namespc); 3362 } 3363 3364 // Link the anonymous namespace with its previous declaration. 3365 if (PrevDecl) { 3366 assert(PrevDecl->isAnonymousNamespace()); 3367 assert(!PrevDecl->getNextNamespace()); 3368 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3369 PrevDecl->setNextNamespace(Namespc); 3370 } 3371 3372 CurContext->addDecl(Namespc); 3373 3374 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3375 // behaves as if it were replaced by 3376 // namespace unique { /* empty body */ } 3377 // using namespace unique; 3378 // namespace unique { namespace-body } 3379 // where all occurrences of 'unique' in a translation unit are 3380 // replaced by the same identifier and this identifier differs 3381 // from all other identifiers in the entire program. 3382 3383 // We just create the namespace with an empty name and then add an 3384 // implicit using declaration, just like the standard suggests. 3385 // 3386 // CodeGen enforces the "universally unique" aspect by giving all 3387 // declarations semantically contained within an anonymous 3388 // namespace internal linkage. 3389 3390 if (!PrevDecl) { 3391 UsingDirectiveDecl* UD 3392 = UsingDirectiveDecl::Create(Context, CurContext, 3393 /* 'using' */ LBrace, 3394 /* 'namespace' */ SourceLocation(), 3395 /* qualifier */ SourceRange(), 3396 /* NNS */ NULL, 3397 /* identifier */ SourceLocation(), 3398 Namespc, 3399 /* Ancestor */ CurContext); 3400 UD->setImplicit(); 3401 CurContext->addDecl(UD); 3402 } 3403 } 3404 3405 // Although we could have an invalid decl (i.e. the namespace name is a 3406 // redefinition), push it as current DeclContext and try to continue parsing. 3407 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3408 // for the namespace has the declarations that showed up in that particular 3409 // namespace definition. 3410 PushDeclContext(NamespcScope, Namespc); 3411 return Namespc; 3412} 3413 3414/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3415/// is a namespace alias, returns the namespace it points to. 3416static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3417 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3418 return AD->getNamespace(); 3419 return dyn_cast_or_null<NamespaceDecl>(D); 3420} 3421 3422/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3423/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3424void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3425 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3426 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3427 Namespc->setRBracLoc(RBrace); 3428 PopDeclContext(); 3429 if (Namespc->hasAttr<VisibilityAttr>()) 3430 PopPragmaVisibility(); 3431} 3432 3433CXXRecordDecl *Sema::getStdBadAlloc() const { 3434 return cast_or_null<CXXRecordDecl>( 3435 StdBadAlloc.get(Context.getExternalSource())); 3436} 3437 3438NamespaceDecl *Sema::getStdNamespace() const { 3439 return cast_or_null<NamespaceDecl>( 3440 StdNamespace.get(Context.getExternalSource())); 3441} 3442 3443/// \brief Retrieve the special "std" namespace, which may require us to 3444/// implicitly define the namespace. 3445NamespaceDecl *Sema::getOrCreateStdNamespace() { 3446 if (!StdNamespace) { 3447 // The "std" namespace has not yet been defined, so build one implicitly. 3448 StdNamespace = NamespaceDecl::Create(Context, 3449 Context.getTranslationUnitDecl(), 3450 SourceLocation(), 3451 &PP.getIdentifierTable().get("std")); 3452 getStdNamespace()->setImplicit(true); 3453 } 3454 3455 return getStdNamespace(); 3456} 3457 3458Decl *Sema::ActOnUsingDirective(Scope *S, 3459 SourceLocation UsingLoc, 3460 SourceLocation NamespcLoc, 3461 CXXScopeSpec &SS, 3462 SourceLocation IdentLoc, 3463 IdentifierInfo *NamespcName, 3464 AttributeList *AttrList) { 3465 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3466 assert(NamespcName && "Invalid NamespcName."); 3467 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3468 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3469 3470 UsingDirectiveDecl *UDir = 0; 3471 NestedNameSpecifier *Qualifier = 0; 3472 if (SS.isSet()) 3473 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3474 3475 // Lookup namespace name. 3476 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3477 LookupParsedName(R, S, &SS); 3478 if (R.isAmbiguous()) 3479 return 0; 3480 3481 if (R.empty()) { 3482 // Allow "using namespace std;" or "using namespace ::std;" even if 3483 // "std" hasn't been defined yet, for GCC compatibility. 3484 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3485 NamespcName->isStr("std")) { 3486 Diag(IdentLoc, diag::ext_using_undefined_std); 3487 R.addDecl(getOrCreateStdNamespace()); 3488 R.resolveKind(); 3489 } 3490 // Otherwise, attempt typo correction. 3491 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3492 CTC_NoKeywords, 0)) { 3493 if (R.getAsSingle<NamespaceDecl>() || 3494 R.getAsSingle<NamespaceAliasDecl>()) { 3495 if (DeclContext *DC = computeDeclContext(SS, false)) 3496 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3497 << NamespcName << DC << Corrected << SS.getRange() 3498 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3499 else 3500 Diag(IdentLoc, diag::err_using_directive_suggest) 3501 << NamespcName << Corrected 3502 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3503 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3504 << Corrected; 3505 3506 NamespcName = Corrected.getAsIdentifierInfo(); 3507 } else { 3508 R.clear(); 3509 R.setLookupName(NamespcName); 3510 } 3511 } 3512 } 3513 3514 if (!R.empty()) { 3515 NamedDecl *Named = R.getFoundDecl(); 3516 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3517 && "expected namespace decl"); 3518 // C++ [namespace.udir]p1: 3519 // A using-directive specifies that the names in the nominated 3520 // namespace can be used in the scope in which the 3521 // using-directive appears after the using-directive. During 3522 // unqualified name lookup (3.4.1), the names appear as if they 3523 // were declared in the nearest enclosing namespace which 3524 // contains both the using-directive and the nominated 3525 // namespace. [Note: in this context, "contains" means "contains 3526 // directly or indirectly". ] 3527 3528 // Find enclosing context containing both using-directive and 3529 // nominated namespace. 3530 NamespaceDecl *NS = getNamespaceDecl(Named); 3531 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3532 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3533 CommonAncestor = CommonAncestor->getParent(); 3534 3535 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3536 SS.getRange(), 3537 (NestedNameSpecifier *)SS.getScopeRep(), 3538 IdentLoc, Named, CommonAncestor); 3539 PushUsingDirective(S, UDir); 3540 } else { 3541 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3542 } 3543 3544 // FIXME: We ignore attributes for now. 3545 delete AttrList; 3546 return UDir; 3547} 3548 3549void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3550 // If scope has associated entity, then using directive is at namespace 3551 // or translation unit scope. We add UsingDirectiveDecls, into 3552 // it's lookup structure. 3553 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3554 Ctx->addDecl(UDir); 3555 else 3556 // Otherwise it is block-sope. using-directives will affect lookup 3557 // only to the end of scope. 3558 S->PushUsingDirective(UDir); 3559} 3560 3561 3562Decl *Sema::ActOnUsingDeclaration(Scope *S, 3563 AccessSpecifier AS, 3564 bool HasUsingKeyword, 3565 SourceLocation UsingLoc, 3566 CXXScopeSpec &SS, 3567 UnqualifiedId &Name, 3568 AttributeList *AttrList, 3569 bool IsTypeName, 3570 SourceLocation TypenameLoc) { 3571 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3572 3573 switch (Name.getKind()) { 3574 case UnqualifiedId::IK_Identifier: 3575 case UnqualifiedId::IK_OperatorFunctionId: 3576 case UnqualifiedId::IK_LiteralOperatorId: 3577 case UnqualifiedId::IK_ConversionFunctionId: 3578 break; 3579 3580 case UnqualifiedId::IK_ConstructorName: 3581 case UnqualifiedId::IK_ConstructorTemplateId: 3582 // C++0x inherited constructors. 3583 if (getLangOptions().CPlusPlus0x) break; 3584 3585 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3586 << SS.getRange(); 3587 return 0; 3588 3589 case UnqualifiedId::IK_DestructorName: 3590 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3591 << SS.getRange(); 3592 return 0; 3593 3594 case UnqualifiedId::IK_TemplateId: 3595 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3596 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3597 return 0; 3598 } 3599 3600 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3601 DeclarationName TargetName = TargetNameInfo.getName(); 3602 if (!TargetName) 3603 return 0; 3604 3605 // Warn about using declarations. 3606 // TODO: store that the declaration was written without 'using' and 3607 // talk about access decls instead of using decls in the 3608 // diagnostics. 3609 if (!HasUsingKeyword) { 3610 UsingLoc = Name.getSourceRange().getBegin(); 3611 3612 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3613 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3614 } 3615 3616 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3617 TargetNameInfo, AttrList, 3618 /* IsInstantiation */ false, 3619 IsTypeName, TypenameLoc); 3620 if (UD) 3621 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3622 3623 return UD; 3624} 3625 3626/// \brief Determine whether a using declaration considers the given 3627/// declarations as "equivalent", e.g., if they are redeclarations of 3628/// the same entity or are both typedefs of the same type. 3629static bool 3630IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3631 bool &SuppressRedeclaration) { 3632 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3633 SuppressRedeclaration = false; 3634 return true; 3635 } 3636 3637 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3638 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3639 SuppressRedeclaration = true; 3640 return Context.hasSameType(TD1->getUnderlyingType(), 3641 TD2->getUnderlyingType()); 3642 } 3643 3644 return false; 3645} 3646 3647 3648/// Determines whether to create a using shadow decl for a particular 3649/// decl, given the set of decls existing prior to this using lookup. 3650bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3651 const LookupResult &Previous) { 3652 // Diagnose finding a decl which is not from a base class of the 3653 // current class. We do this now because there are cases where this 3654 // function will silently decide not to build a shadow decl, which 3655 // will pre-empt further diagnostics. 3656 // 3657 // We don't need to do this in C++0x because we do the check once on 3658 // the qualifier. 3659 // 3660 // FIXME: diagnose the following if we care enough: 3661 // struct A { int foo; }; 3662 // struct B : A { using A::foo; }; 3663 // template <class T> struct C : A {}; 3664 // template <class T> struct D : C<T> { using B::foo; } // <--- 3665 // This is invalid (during instantiation) in C++03 because B::foo 3666 // resolves to the using decl in B, which is not a base class of D<T>. 3667 // We can't diagnose it immediately because C<T> is an unknown 3668 // specialization. The UsingShadowDecl in D<T> then points directly 3669 // to A::foo, which will look well-formed when we instantiate. 3670 // The right solution is to not collapse the shadow-decl chain. 3671 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3672 DeclContext *OrigDC = Orig->getDeclContext(); 3673 3674 // Handle enums and anonymous structs. 3675 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3676 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3677 while (OrigRec->isAnonymousStructOrUnion()) 3678 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3679 3680 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3681 if (OrigDC == CurContext) { 3682 Diag(Using->getLocation(), 3683 diag::err_using_decl_nested_name_specifier_is_current_class) 3684 << Using->getNestedNameRange(); 3685 Diag(Orig->getLocation(), diag::note_using_decl_target); 3686 return true; 3687 } 3688 3689 Diag(Using->getNestedNameRange().getBegin(), 3690 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3691 << Using->getTargetNestedNameDecl() 3692 << cast<CXXRecordDecl>(CurContext) 3693 << Using->getNestedNameRange(); 3694 Diag(Orig->getLocation(), diag::note_using_decl_target); 3695 return true; 3696 } 3697 } 3698 3699 if (Previous.empty()) return false; 3700 3701 NamedDecl *Target = Orig; 3702 if (isa<UsingShadowDecl>(Target)) 3703 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3704 3705 // If the target happens to be one of the previous declarations, we 3706 // don't have a conflict. 3707 // 3708 // FIXME: but we might be increasing its access, in which case we 3709 // should redeclare it. 3710 NamedDecl *NonTag = 0, *Tag = 0; 3711 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3712 I != E; ++I) { 3713 NamedDecl *D = (*I)->getUnderlyingDecl(); 3714 bool Result; 3715 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3716 return Result; 3717 3718 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3719 } 3720 3721 if (Target->isFunctionOrFunctionTemplate()) { 3722 FunctionDecl *FD; 3723 if (isa<FunctionTemplateDecl>(Target)) 3724 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3725 else 3726 FD = cast<FunctionDecl>(Target); 3727 3728 NamedDecl *OldDecl = 0; 3729 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3730 case Ovl_Overload: 3731 return false; 3732 3733 case Ovl_NonFunction: 3734 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3735 break; 3736 3737 // We found a decl with the exact signature. 3738 case Ovl_Match: 3739 // If we're in a record, we want to hide the target, so we 3740 // return true (without a diagnostic) to tell the caller not to 3741 // build a shadow decl. 3742 if (CurContext->isRecord()) 3743 return true; 3744 3745 // If we're not in a record, this is an error. 3746 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3747 break; 3748 } 3749 3750 Diag(Target->getLocation(), diag::note_using_decl_target); 3751 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3752 return true; 3753 } 3754 3755 // Target is not a function. 3756 3757 if (isa<TagDecl>(Target)) { 3758 // No conflict between a tag and a non-tag. 3759 if (!Tag) return false; 3760 3761 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3762 Diag(Target->getLocation(), diag::note_using_decl_target); 3763 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3764 return true; 3765 } 3766 3767 // No conflict between a tag and a non-tag. 3768 if (!NonTag) return false; 3769 3770 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3771 Diag(Target->getLocation(), diag::note_using_decl_target); 3772 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3773 return true; 3774} 3775 3776/// Builds a shadow declaration corresponding to a 'using' declaration. 3777UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3778 UsingDecl *UD, 3779 NamedDecl *Orig) { 3780 3781 // If we resolved to another shadow declaration, just coalesce them. 3782 NamedDecl *Target = Orig; 3783 if (isa<UsingShadowDecl>(Target)) { 3784 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3785 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3786 } 3787 3788 UsingShadowDecl *Shadow 3789 = UsingShadowDecl::Create(Context, CurContext, 3790 UD->getLocation(), UD, Target); 3791 UD->addShadowDecl(Shadow); 3792 3793 if (S) 3794 PushOnScopeChains(Shadow, S); 3795 else 3796 CurContext->addDecl(Shadow); 3797 Shadow->setAccess(UD->getAccess()); 3798 3799 // Register it as a conversion if appropriate. 3800 if (Shadow->getDeclName().getNameKind() 3801 == DeclarationName::CXXConversionFunctionName) 3802 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3803 3804 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3805 Shadow->setInvalidDecl(); 3806 3807 return Shadow; 3808} 3809 3810/// Hides a using shadow declaration. This is required by the current 3811/// using-decl implementation when a resolvable using declaration in a 3812/// class is followed by a declaration which would hide or override 3813/// one or more of the using decl's targets; for example: 3814/// 3815/// struct Base { void foo(int); }; 3816/// struct Derived : Base { 3817/// using Base::foo; 3818/// void foo(int); 3819/// }; 3820/// 3821/// The governing language is C++03 [namespace.udecl]p12: 3822/// 3823/// When a using-declaration brings names from a base class into a 3824/// derived class scope, member functions in the derived class 3825/// override and/or hide member functions with the same name and 3826/// parameter types in a base class (rather than conflicting). 3827/// 3828/// There are two ways to implement this: 3829/// (1) optimistically create shadow decls when they're not hidden 3830/// by existing declarations, or 3831/// (2) don't create any shadow decls (or at least don't make them 3832/// visible) until we've fully parsed/instantiated the class. 3833/// The problem with (1) is that we might have to retroactively remove 3834/// a shadow decl, which requires several O(n) operations because the 3835/// decl structures are (very reasonably) not designed for removal. 3836/// (2) avoids this but is very fiddly and phase-dependent. 3837void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3838 if (Shadow->getDeclName().getNameKind() == 3839 DeclarationName::CXXConversionFunctionName) 3840 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3841 3842 // Remove it from the DeclContext... 3843 Shadow->getDeclContext()->removeDecl(Shadow); 3844 3845 // ...and the scope, if applicable... 3846 if (S) { 3847 S->RemoveDecl(Shadow); 3848 IdResolver.RemoveDecl(Shadow); 3849 } 3850 3851 // ...and the using decl. 3852 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3853 3854 // TODO: complain somehow if Shadow was used. It shouldn't 3855 // be possible for this to happen, because...? 3856} 3857 3858/// Builds a using declaration. 3859/// 3860/// \param IsInstantiation - Whether this call arises from an 3861/// instantiation of an unresolved using declaration. We treat 3862/// the lookup differently for these declarations. 3863NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3864 SourceLocation UsingLoc, 3865 CXXScopeSpec &SS, 3866 const DeclarationNameInfo &NameInfo, 3867 AttributeList *AttrList, 3868 bool IsInstantiation, 3869 bool IsTypeName, 3870 SourceLocation TypenameLoc) { 3871 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3872 SourceLocation IdentLoc = NameInfo.getLoc(); 3873 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3874 3875 // FIXME: We ignore attributes for now. 3876 delete AttrList; 3877 3878 if (SS.isEmpty()) { 3879 Diag(IdentLoc, diag::err_using_requires_qualname); 3880 return 0; 3881 } 3882 3883 // Do the redeclaration lookup in the current scope. 3884 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 3885 ForRedeclaration); 3886 Previous.setHideTags(false); 3887 if (S) { 3888 LookupName(Previous, S); 3889 3890 // It is really dumb that we have to do this. 3891 LookupResult::Filter F = Previous.makeFilter(); 3892 while (F.hasNext()) { 3893 NamedDecl *D = F.next(); 3894 if (!isDeclInScope(D, CurContext, S)) 3895 F.erase(); 3896 } 3897 F.done(); 3898 } else { 3899 assert(IsInstantiation && "no scope in non-instantiation"); 3900 assert(CurContext->isRecord() && "scope not record in instantiation"); 3901 LookupQualifiedName(Previous, CurContext); 3902 } 3903 3904 NestedNameSpecifier *NNS = 3905 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3906 3907 // Check for invalid redeclarations. 3908 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3909 return 0; 3910 3911 // Check for bad qualifiers. 3912 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3913 return 0; 3914 3915 DeclContext *LookupContext = computeDeclContext(SS); 3916 NamedDecl *D; 3917 if (!LookupContext) { 3918 if (IsTypeName) { 3919 // FIXME: not all declaration name kinds are legal here 3920 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3921 UsingLoc, TypenameLoc, 3922 SS.getRange(), NNS, 3923 IdentLoc, NameInfo.getName()); 3924 } else { 3925 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3926 UsingLoc, SS.getRange(), 3927 NNS, NameInfo); 3928 } 3929 } else { 3930 D = UsingDecl::Create(Context, CurContext, 3931 SS.getRange(), UsingLoc, NNS, NameInfo, 3932 IsTypeName); 3933 } 3934 D->setAccess(AS); 3935 CurContext->addDecl(D); 3936 3937 if (!LookupContext) return D; 3938 UsingDecl *UD = cast<UsingDecl>(D); 3939 3940 if (RequireCompleteDeclContext(SS, LookupContext)) { 3941 UD->setInvalidDecl(); 3942 return UD; 3943 } 3944 3945 // Look up the target name. 3946 3947 LookupResult R(*this, NameInfo, LookupOrdinaryName); 3948 3949 // Unlike most lookups, we don't always want to hide tag 3950 // declarations: tag names are visible through the using declaration 3951 // even if hidden by ordinary names, *except* in a dependent context 3952 // where it's important for the sanity of two-phase lookup. 3953 if (!IsInstantiation) 3954 R.setHideTags(false); 3955 3956 LookupQualifiedName(R, LookupContext); 3957 3958 if (R.empty()) { 3959 Diag(IdentLoc, diag::err_no_member) 3960 << NameInfo.getName() << LookupContext << SS.getRange(); 3961 UD->setInvalidDecl(); 3962 return UD; 3963 } 3964 3965 if (R.isAmbiguous()) { 3966 UD->setInvalidDecl(); 3967 return UD; 3968 } 3969 3970 if (IsTypeName) { 3971 // If we asked for a typename and got a non-type decl, error out. 3972 if (!R.getAsSingle<TypeDecl>()) { 3973 Diag(IdentLoc, diag::err_using_typename_non_type); 3974 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3975 Diag((*I)->getUnderlyingDecl()->getLocation(), 3976 diag::note_using_decl_target); 3977 UD->setInvalidDecl(); 3978 return UD; 3979 } 3980 } else { 3981 // If we asked for a non-typename and we got a type, error out, 3982 // but only if this is an instantiation of an unresolved using 3983 // decl. Otherwise just silently find the type name. 3984 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 3985 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 3986 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 3987 UD->setInvalidDecl(); 3988 return UD; 3989 } 3990 } 3991 3992 // C++0x N2914 [namespace.udecl]p6: 3993 // A using-declaration shall not name a namespace. 3994 if (R.getAsSingle<NamespaceDecl>()) { 3995 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3996 << SS.getRange(); 3997 UD->setInvalidDecl(); 3998 return UD; 3999 } 4000 4001 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4002 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4003 BuildUsingShadowDecl(S, UD, *I); 4004 } 4005 4006 return UD; 4007} 4008 4009/// Checks that the given using declaration is not an invalid 4010/// redeclaration. Note that this is checking only for the using decl 4011/// itself, not for any ill-formedness among the UsingShadowDecls. 4012bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4013 bool isTypeName, 4014 const CXXScopeSpec &SS, 4015 SourceLocation NameLoc, 4016 const LookupResult &Prev) { 4017 // C++03 [namespace.udecl]p8: 4018 // C++0x [namespace.udecl]p10: 4019 // A using-declaration is a declaration and can therefore be used 4020 // repeatedly where (and only where) multiple declarations are 4021 // allowed. 4022 // 4023 // That's in non-member contexts. 4024 if (!CurContext->getLookupContext()->isRecord()) 4025 return false; 4026 4027 NestedNameSpecifier *Qual 4028 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4029 4030 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4031 NamedDecl *D = *I; 4032 4033 bool DTypename; 4034 NestedNameSpecifier *DQual; 4035 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4036 DTypename = UD->isTypeName(); 4037 DQual = UD->getTargetNestedNameDecl(); 4038 } else if (UnresolvedUsingValueDecl *UD 4039 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4040 DTypename = false; 4041 DQual = UD->getTargetNestedNameSpecifier(); 4042 } else if (UnresolvedUsingTypenameDecl *UD 4043 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4044 DTypename = true; 4045 DQual = UD->getTargetNestedNameSpecifier(); 4046 } else continue; 4047 4048 // using decls differ if one says 'typename' and the other doesn't. 4049 // FIXME: non-dependent using decls? 4050 if (isTypeName != DTypename) continue; 4051 4052 // using decls differ if they name different scopes (but note that 4053 // template instantiation can cause this check to trigger when it 4054 // didn't before instantiation). 4055 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4056 Context.getCanonicalNestedNameSpecifier(DQual)) 4057 continue; 4058 4059 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4060 Diag(D->getLocation(), diag::note_using_decl) << 1; 4061 return true; 4062 } 4063 4064 return false; 4065} 4066 4067 4068/// Checks that the given nested-name qualifier used in a using decl 4069/// in the current context is appropriately related to the current 4070/// scope. If an error is found, diagnoses it and returns true. 4071bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4072 const CXXScopeSpec &SS, 4073 SourceLocation NameLoc) { 4074 DeclContext *NamedContext = computeDeclContext(SS); 4075 4076 if (!CurContext->isRecord()) { 4077 // C++03 [namespace.udecl]p3: 4078 // C++0x [namespace.udecl]p8: 4079 // A using-declaration for a class member shall be a member-declaration. 4080 4081 // If we weren't able to compute a valid scope, it must be a 4082 // dependent class scope. 4083 if (!NamedContext || NamedContext->isRecord()) { 4084 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4085 << SS.getRange(); 4086 return true; 4087 } 4088 4089 // Otherwise, everything is known to be fine. 4090 return false; 4091 } 4092 4093 // The current scope is a record. 4094 4095 // If the named context is dependent, we can't decide much. 4096 if (!NamedContext) { 4097 // FIXME: in C++0x, we can diagnose if we can prove that the 4098 // nested-name-specifier does not refer to a base class, which is 4099 // still possible in some cases. 4100 4101 // Otherwise we have to conservatively report that things might be 4102 // okay. 4103 return false; 4104 } 4105 4106 if (!NamedContext->isRecord()) { 4107 // Ideally this would point at the last name in the specifier, 4108 // but we don't have that level of source info. 4109 Diag(SS.getRange().getBegin(), 4110 diag::err_using_decl_nested_name_specifier_is_not_class) 4111 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4112 return true; 4113 } 4114 4115 if (getLangOptions().CPlusPlus0x) { 4116 // C++0x [namespace.udecl]p3: 4117 // In a using-declaration used as a member-declaration, the 4118 // nested-name-specifier shall name a base class of the class 4119 // being defined. 4120 4121 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4122 cast<CXXRecordDecl>(NamedContext))) { 4123 if (CurContext == NamedContext) { 4124 Diag(NameLoc, 4125 diag::err_using_decl_nested_name_specifier_is_current_class) 4126 << SS.getRange(); 4127 return true; 4128 } 4129 4130 Diag(SS.getRange().getBegin(), 4131 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4132 << (NestedNameSpecifier*) SS.getScopeRep() 4133 << cast<CXXRecordDecl>(CurContext) 4134 << SS.getRange(); 4135 return true; 4136 } 4137 4138 return false; 4139 } 4140 4141 // C++03 [namespace.udecl]p4: 4142 // A using-declaration used as a member-declaration shall refer 4143 // to a member of a base class of the class being defined [etc.]. 4144 4145 // Salient point: SS doesn't have to name a base class as long as 4146 // lookup only finds members from base classes. Therefore we can 4147 // diagnose here only if we can prove that that can't happen, 4148 // i.e. if the class hierarchies provably don't intersect. 4149 4150 // TODO: it would be nice if "definitely valid" results were cached 4151 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4152 // need to be repeated. 4153 4154 struct UserData { 4155 llvm::DenseSet<const CXXRecordDecl*> Bases; 4156 4157 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4158 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4159 Data->Bases.insert(Base); 4160 return true; 4161 } 4162 4163 bool hasDependentBases(const CXXRecordDecl *Class) { 4164 return !Class->forallBases(collect, this); 4165 } 4166 4167 /// Returns true if the base is dependent or is one of the 4168 /// accumulated base classes. 4169 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4170 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4171 return !Data->Bases.count(Base); 4172 } 4173 4174 bool mightShareBases(const CXXRecordDecl *Class) { 4175 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4176 } 4177 }; 4178 4179 UserData Data; 4180 4181 // Returns false if we find a dependent base. 4182 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4183 return false; 4184 4185 // Returns false if the class has a dependent base or if it or one 4186 // of its bases is present in the base set of the current context. 4187 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4188 return false; 4189 4190 Diag(SS.getRange().getBegin(), 4191 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4192 << (NestedNameSpecifier*) SS.getScopeRep() 4193 << cast<CXXRecordDecl>(CurContext) 4194 << SS.getRange(); 4195 4196 return true; 4197} 4198 4199Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4200 SourceLocation NamespaceLoc, 4201 SourceLocation AliasLoc, 4202 IdentifierInfo *Alias, 4203 CXXScopeSpec &SS, 4204 SourceLocation IdentLoc, 4205 IdentifierInfo *Ident) { 4206 4207 // Lookup the namespace name. 4208 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4209 LookupParsedName(R, S, &SS); 4210 4211 // Check if we have a previous declaration with the same name. 4212 NamedDecl *PrevDecl 4213 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4214 ForRedeclaration); 4215 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4216 PrevDecl = 0; 4217 4218 if (PrevDecl) { 4219 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4220 // We already have an alias with the same name that points to the same 4221 // namespace, so don't create a new one. 4222 // FIXME: At some point, we'll want to create the (redundant) 4223 // declaration to maintain better source information. 4224 if (!R.isAmbiguous() && !R.empty() && 4225 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4226 return 0; 4227 } 4228 4229 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4230 diag::err_redefinition_different_kind; 4231 Diag(AliasLoc, DiagID) << Alias; 4232 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4233 return 0; 4234 } 4235 4236 if (R.isAmbiguous()) 4237 return 0; 4238 4239 if (R.empty()) { 4240 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4241 CTC_NoKeywords, 0)) { 4242 if (R.getAsSingle<NamespaceDecl>() || 4243 R.getAsSingle<NamespaceAliasDecl>()) { 4244 if (DeclContext *DC = computeDeclContext(SS, false)) 4245 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4246 << Ident << DC << Corrected << SS.getRange() 4247 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4248 else 4249 Diag(IdentLoc, diag::err_using_directive_suggest) 4250 << Ident << Corrected 4251 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4252 4253 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4254 << Corrected; 4255 4256 Ident = Corrected.getAsIdentifierInfo(); 4257 } else { 4258 R.clear(); 4259 R.setLookupName(Ident); 4260 } 4261 } 4262 4263 if (R.empty()) { 4264 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4265 return 0; 4266 } 4267 } 4268 4269 NamespaceAliasDecl *AliasDecl = 4270 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4271 Alias, SS.getRange(), 4272 (NestedNameSpecifier *)SS.getScopeRep(), 4273 IdentLoc, R.getFoundDecl()); 4274 4275 PushOnScopeChains(AliasDecl, S); 4276 return AliasDecl; 4277} 4278 4279namespace { 4280 /// \brief Scoped object used to handle the state changes required in Sema 4281 /// to implicitly define the body of a C++ member function; 4282 class ImplicitlyDefinedFunctionScope { 4283 Sema &S; 4284 DeclContext *PreviousContext; 4285 4286 public: 4287 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4288 : S(S), PreviousContext(S.CurContext) 4289 { 4290 S.CurContext = Method; 4291 S.PushFunctionScope(); 4292 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4293 } 4294 4295 ~ImplicitlyDefinedFunctionScope() { 4296 S.PopExpressionEvaluationContext(); 4297 S.PopFunctionOrBlockScope(); 4298 S.CurContext = PreviousContext; 4299 } 4300 }; 4301} 4302 4303CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4304 CXXRecordDecl *ClassDecl) { 4305 // C++ [class.ctor]p5: 4306 // A default constructor for a class X is a constructor of class X 4307 // that can be called without an argument. If there is no 4308 // user-declared constructor for class X, a default constructor is 4309 // implicitly declared. An implicitly-declared default constructor 4310 // is an inline public member of its class. 4311 assert(!ClassDecl->hasUserDeclaredConstructor() && 4312 "Should not build implicit default constructor!"); 4313 4314 // C++ [except.spec]p14: 4315 // An implicitly declared special member function (Clause 12) shall have an 4316 // exception-specification. [...] 4317 ImplicitExceptionSpecification ExceptSpec(Context); 4318 4319 // Direct base-class destructors. 4320 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4321 BEnd = ClassDecl->bases_end(); 4322 B != BEnd; ++B) { 4323 if (B->isVirtual()) // Handled below. 4324 continue; 4325 4326 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4327 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4328 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4329 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4330 else if (CXXConstructorDecl *Constructor 4331 = BaseClassDecl->getDefaultConstructor()) 4332 ExceptSpec.CalledDecl(Constructor); 4333 } 4334 } 4335 4336 // Virtual base-class destructors. 4337 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4338 BEnd = ClassDecl->vbases_end(); 4339 B != BEnd; ++B) { 4340 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4341 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4342 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4343 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4344 else if (CXXConstructorDecl *Constructor 4345 = BaseClassDecl->getDefaultConstructor()) 4346 ExceptSpec.CalledDecl(Constructor); 4347 } 4348 } 4349 4350 // Field destructors. 4351 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4352 FEnd = ClassDecl->field_end(); 4353 F != FEnd; ++F) { 4354 if (const RecordType *RecordTy 4355 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4356 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4357 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4358 ExceptSpec.CalledDecl( 4359 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4360 else if (CXXConstructorDecl *Constructor 4361 = FieldClassDecl->getDefaultConstructor()) 4362 ExceptSpec.CalledDecl(Constructor); 4363 } 4364 } 4365 4366 4367 // Create the actual constructor declaration. 4368 CanQualType ClassType 4369 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4370 DeclarationName Name 4371 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4372 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4373 CXXConstructorDecl *DefaultCon 4374 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 4375 Context.getFunctionType(Context.VoidTy, 4376 0, 0, false, 0, 4377 ExceptSpec.hasExceptionSpecification(), 4378 ExceptSpec.hasAnyExceptionSpecification(), 4379 ExceptSpec.size(), 4380 ExceptSpec.data(), 4381 FunctionType::ExtInfo()), 4382 /*TInfo=*/0, 4383 /*isExplicit=*/false, 4384 /*isInline=*/true, 4385 /*isImplicitlyDeclared=*/true); 4386 DefaultCon->setAccess(AS_public); 4387 DefaultCon->setImplicit(); 4388 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4389 4390 // Note that we have declared this constructor. 4391 ClassDecl->setDeclaredDefaultConstructor(true); 4392 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4393 4394 if (Scope *S = getScopeForContext(ClassDecl)) 4395 PushOnScopeChains(DefaultCon, S, false); 4396 ClassDecl->addDecl(DefaultCon); 4397 4398 return DefaultCon; 4399} 4400 4401void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4402 CXXConstructorDecl *Constructor) { 4403 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4404 !Constructor->isUsed(false)) && 4405 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4406 4407 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4408 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4409 4410 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4411 ErrorTrap Trap(*this); 4412 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4413 Trap.hasErrorOccurred()) { 4414 Diag(CurrentLocation, diag::note_member_synthesized_at) 4415 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4416 Constructor->setInvalidDecl(); 4417 } else { 4418 Constructor->setUsed(); 4419 MarkVTableUsed(CurrentLocation, ClassDecl); 4420 } 4421} 4422 4423CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4424 // C++ [class.dtor]p2: 4425 // If a class has no user-declared destructor, a destructor is 4426 // declared implicitly. An implicitly-declared destructor is an 4427 // inline public member of its class. 4428 4429 // C++ [except.spec]p14: 4430 // An implicitly declared special member function (Clause 12) shall have 4431 // an exception-specification. 4432 ImplicitExceptionSpecification ExceptSpec(Context); 4433 4434 // Direct base-class destructors. 4435 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4436 BEnd = ClassDecl->bases_end(); 4437 B != BEnd; ++B) { 4438 if (B->isVirtual()) // Handled below. 4439 continue; 4440 4441 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4442 ExceptSpec.CalledDecl( 4443 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4444 } 4445 4446 // Virtual base-class destructors. 4447 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4448 BEnd = ClassDecl->vbases_end(); 4449 B != BEnd; ++B) { 4450 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4451 ExceptSpec.CalledDecl( 4452 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4453 } 4454 4455 // Field destructors. 4456 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4457 FEnd = ClassDecl->field_end(); 4458 F != FEnd; ++F) { 4459 if (const RecordType *RecordTy 4460 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4461 ExceptSpec.CalledDecl( 4462 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4463 } 4464 4465 // Create the actual destructor declaration. 4466 QualType Ty = Context.getFunctionType(Context.VoidTy, 4467 0, 0, false, 0, 4468 ExceptSpec.hasExceptionSpecification(), 4469 ExceptSpec.hasAnyExceptionSpecification(), 4470 ExceptSpec.size(), 4471 ExceptSpec.data(), 4472 FunctionType::ExtInfo()); 4473 4474 CanQualType ClassType 4475 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4476 DeclarationName Name 4477 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4478 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4479 CXXDestructorDecl *Destructor 4480 = CXXDestructorDecl::Create(Context, ClassDecl, NameInfo, Ty, 4481 /*isInline=*/true, 4482 /*isImplicitlyDeclared=*/true); 4483 Destructor->setAccess(AS_public); 4484 Destructor->setImplicit(); 4485 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4486 4487 // Note that we have declared this destructor. 4488 ClassDecl->setDeclaredDestructor(true); 4489 ++ASTContext::NumImplicitDestructorsDeclared; 4490 4491 // Introduce this destructor into its scope. 4492 if (Scope *S = getScopeForContext(ClassDecl)) 4493 PushOnScopeChains(Destructor, S, false); 4494 ClassDecl->addDecl(Destructor); 4495 4496 // This could be uniqued if it ever proves significant. 4497 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4498 4499 AddOverriddenMethods(ClassDecl, Destructor); 4500 4501 return Destructor; 4502} 4503 4504void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4505 CXXDestructorDecl *Destructor) { 4506 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4507 "DefineImplicitDestructor - call it for implicit default dtor"); 4508 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4509 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4510 4511 if (Destructor->isInvalidDecl()) 4512 return; 4513 4514 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4515 4516 ErrorTrap Trap(*this); 4517 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4518 Destructor->getParent()); 4519 4520 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4521 Diag(CurrentLocation, diag::note_member_synthesized_at) 4522 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4523 4524 Destructor->setInvalidDecl(); 4525 return; 4526 } 4527 4528 Destructor->setUsed(); 4529 MarkVTableUsed(CurrentLocation, ClassDecl); 4530} 4531 4532/// \brief Builds a statement that copies the given entity from \p From to 4533/// \c To. 4534/// 4535/// This routine is used to copy the members of a class with an 4536/// implicitly-declared copy assignment operator. When the entities being 4537/// copied are arrays, this routine builds for loops to copy them. 4538/// 4539/// \param S The Sema object used for type-checking. 4540/// 4541/// \param Loc The location where the implicit copy is being generated. 4542/// 4543/// \param T The type of the expressions being copied. Both expressions must 4544/// have this type. 4545/// 4546/// \param To The expression we are copying to. 4547/// 4548/// \param From The expression we are copying from. 4549/// 4550/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4551/// Otherwise, it's a non-static member subobject. 4552/// 4553/// \param Depth Internal parameter recording the depth of the recursion. 4554/// 4555/// \returns A statement or a loop that copies the expressions. 4556static StmtResult 4557BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4558 Expr *To, Expr *From, 4559 bool CopyingBaseSubobject, unsigned Depth = 0) { 4560 // C++0x [class.copy]p30: 4561 // Each subobject is assigned in the manner appropriate to its type: 4562 // 4563 // - if the subobject is of class type, the copy assignment operator 4564 // for the class is used (as if by explicit qualification; that is, 4565 // ignoring any possible virtual overriding functions in more derived 4566 // classes); 4567 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4568 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4569 4570 // Look for operator=. 4571 DeclarationName Name 4572 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4573 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4574 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4575 4576 // Filter out any result that isn't a copy-assignment operator. 4577 LookupResult::Filter F = OpLookup.makeFilter(); 4578 while (F.hasNext()) { 4579 NamedDecl *D = F.next(); 4580 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4581 if (Method->isCopyAssignmentOperator()) 4582 continue; 4583 4584 F.erase(); 4585 } 4586 F.done(); 4587 4588 // Suppress the protected check (C++ [class.protected]) for each of the 4589 // assignment operators we found. This strange dance is required when 4590 // we're assigning via a base classes's copy-assignment operator. To 4591 // ensure that we're getting the right base class subobject (without 4592 // ambiguities), we need to cast "this" to that subobject type; to 4593 // ensure that we don't go through the virtual call mechanism, we need 4594 // to qualify the operator= name with the base class (see below). However, 4595 // this means that if the base class has a protected copy assignment 4596 // operator, the protected member access check will fail. So, we 4597 // rewrite "protected" access to "public" access in this case, since we 4598 // know by construction that we're calling from a derived class. 4599 if (CopyingBaseSubobject) { 4600 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4601 L != LEnd; ++L) { 4602 if (L.getAccess() == AS_protected) 4603 L.setAccess(AS_public); 4604 } 4605 } 4606 4607 // Create the nested-name-specifier that will be used to qualify the 4608 // reference to operator=; this is required to suppress the virtual 4609 // call mechanism. 4610 CXXScopeSpec SS; 4611 SS.setRange(Loc); 4612 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4613 T.getTypePtr())); 4614 4615 // Create the reference to operator=. 4616 ExprResult OpEqualRef 4617 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 4618 /*FirstQualifierInScope=*/0, OpLookup, 4619 /*TemplateArgs=*/0, 4620 /*SuppressQualifierCheck=*/true); 4621 if (OpEqualRef.isInvalid()) 4622 return S.StmtError(); 4623 4624 // Build the call to the assignment operator. 4625 4626 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4627 OpEqualRef.takeAs<Expr>(), 4628 Loc, &From, 1, 0, Loc); 4629 if (Call.isInvalid()) 4630 return S.StmtError(); 4631 4632 return S.Owned(Call.takeAs<Stmt>()); 4633 } 4634 4635 // - if the subobject is of scalar type, the built-in assignment 4636 // operator is used. 4637 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4638 if (!ArrayTy) { 4639 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 4640 if (Assignment.isInvalid()) 4641 return S.StmtError(); 4642 4643 return S.Owned(Assignment.takeAs<Stmt>()); 4644 } 4645 4646 // - if the subobject is an array, each element is assigned, in the 4647 // manner appropriate to the element type; 4648 4649 // Construct a loop over the array bounds, e.g., 4650 // 4651 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4652 // 4653 // that will copy each of the array elements. 4654 QualType SizeType = S.Context.getSizeType(); 4655 4656 // Create the iteration variable. 4657 IdentifierInfo *IterationVarName = 0; 4658 { 4659 llvm::SmallString<8> Str; 4660 llvm::raw_svector_ostream OS(Str); 4661 OS << "__i" << Depth; 4662 IterationVarName = &S.Context.Idents.get(OS.str()); 4663 } 4664 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4665 IterationVarName, SizeType, 4666 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4667 VarDecl::None, VarDecl::None); 4668 4669 // Initialize the iteration variable to zero. 4670 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4671 IterationVar->setInit(new (S.Context) IntegerLiteral(Zero, SizeType, Loc)); 4672 4673 // Create a reference to the iteration variable; we'll use this several 4674 // times throughout. 4675 Expr *IterationVarRef 4676 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4677 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4678 4679 // Create the DeclStmt that holds the iteration variable. 4680 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4681 4682 // Create the comparison against the array bound. 4683 llvm::APInt Upper = ArrayTy->getSize(); 4684 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4685 Expr *Comparison 4686 = new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4687 new (S.Context) IntegerLiteral(Upper, SizeType, Loc), 4688 BO_NE, S.Context.BoolTy, Loc); 4689 4690 // Create the pre-increment of the iteration variable. 4691 Expr *Increment 4692 = new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4693 UO_PreInc, 4694 SizeType, Loc); 4695 4696 // Subscript the "from" and "to" expressions with the iteration variable. 4697 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 4698 IterationVarRef, Loc)); 4699 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 4700 IterationVarRef, Loc)); 4701 4702 // Build the copy for an individual element of the array. 4703 StmtResult Copy = BuildSingleCopyAssign(S, Loc, 4704 ArrayTy->getElementType(), 4705 To, From, 4706 CopyingBaseSubobject, Depth+1); 4707 if (Copy.isInvalid()) 4708 return S.StmtError(); 4709 4710 // Construct the loop that copies all elements of this array. 4711 return S.ActOnForStmt(Loc, Loc, InitStmt, 4712 S.MakeFullExpr(Comparison), 4713 0, S.MakeFullExpr(Increment), 4714 Loc, Copy.take()); 4715} 4716 4717/// \brief Determine whether the given class has a copy assignment operator 4718/// that accepts a const-qualified argument. 4719static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4720 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4721 4722 if (!Class->hasDeclaredCopyAssignment()) 4723 S.DeclareImplicitCopyAssignment(Class); 4724 4725 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4726 DeclarationName OpName 4727 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4728 4729 DeclContext::lookup_const_iterator Op, OpEnd; 4730 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4731 // C++ [class.copy]p9: 4732 // A user-declared copy assignment operator is a non-static non-template 4733 // member function of class X with exactly one parameter of type X, X&, 4734 // const X&, volatile X& or const volatile X&. 4735 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4736 if (!Method) 4737 continue; 4738 4739 if (Method->isStatic()) 4740 continue; 4741 if (Method->getPrimaryTemplate()) 4742 continue; 4743 const FunctionProtoType *FnType = 4744 Method->getType()->getAs<FunctionProtoType>(); 4745 assert(FnType && "Overloaded operator has no prototype."); 4746 // Don't assert on this; an invalid decl might have been left in the AST. 4747 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4748 continue; 4749 bool AcceptsConst = true; 4750 QualType ArgType = FnType->getArgType(0); 4751 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4752 ArgType = Ref->getPointeeType(); 4753 // Is it a non-const lvalue reference? 4754 if (!ArgType.isConstQualified()) 4755 AcceptsConst = false; 4756 } 4757 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4758 continue; 4759 4760 // We have a single argument of type cv X or cv X&, i.e. we've found the 4761 // copy assignment operator. Return whether it accepts const arguments. 4762 return AcceptsConst; 4763 } 4764 assert(Class->isInvalidDecl() && 4765 "No copy assignment operator declared in valid code."); 4766 return false; 4767} 4768 4769CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4770 // Note: The following rules are largely analoguous to the copy 4771 // constructor rules. Note that virtual bases are not taken into account 4772 // for determining the argument type of the operator. Note also that 4773 // operators taking an object instead of a reference are allowed. 4774 4775 4776 // C++ [class.copy]p10: 4777 // If the class definition does not explicitly declare a copy 4778 // assignment operator, one is declared implicitly. 4779 // The implicitly-defined copy assignment operator for a class X 4780 // will have the form 4781 // 4782 // X& X::operator=(const X&) 4783 // 4784 // if 4785 bool HasConstCopyAssignment = true; 4786 4787 // -- each direct base class B of X has a copy assignment operator 4788 // whose parameter is of type const B&, const volatile B& or B, 4789 // and 4790 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4791 BaseEnd = ClassDecl->bases_end(); 4792 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4793 assert(!Base->getType()->isDependentType() && 4794 "Cannot generate implicit members for class with dependent bases."); 4795 const CXXRecordDecl *BaseClassDecl 4796 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4797 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4798 } 4799 4800 // -- for all the nonstatic data members of X that are of a class 4801 // type M (or array thereof), each such class type has a copy 4802 // assignment operator whose parameter is of type const M&, 4803 // const volatile M& or M. 4804 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4805 FieldEnd = ClassDecl->field_end(); 4806 HasConstCopyAssignment && Field != FieldEnd; 4807 ++Field) { 4808 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4809 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4810 const CXXRecordDecl *FieldClassDecl 4811 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4812 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4813 } 4814 } 4815 4816 // Otherwise, the implicitly declared copy assignment operator will 4817 // have the form 4818 // 4819 // X& X::operator=(X&) 4820 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4821 QualType RetType = Context.getLValueReferenceType(ArgType); 4822 if (HasConstCopyAssignment) 4823 ArgType = ArgType.withConst(); 4824 ArgType = Context.getLValueReferenceType(ArgType); 4825 4826 // C++ [except.spec]p14: 4827 // An implicitly declared special member function (Clause 12) shall have an 4828 // exception-specification. [...] 4829 ImplicitExceptionSpecification ExceptSpec(Context); 4830 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4831 BaseEnd = ClassDecl->bases_end(); 4832 Base != BaseEnd; ++Base) { 4833 CXXRecordDecl *BaseClassDecl 4834 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4835 4836 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4837 DeclareImplicitCopyAssignment(BaseClassDecl); 4838 4839 if (CXXMethodDecl *CopyAssign 4840 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4841 ExceptSpec.CalledDecl(CopyAssign); 4842 } 4843 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4844 FieldEnd = ClassDecl->field_end(); 4845 Field != FieldEnd; 4846 ++Field) { 4847 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4848 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4849 CXXRecordDecl *FieldClassDecl 4850 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4851 4852 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 4853 DeclareImplicitCopyAssignment(FieldClassDecl); 4854 4855 if (CXXMethodDecl *CopyAssign 4856 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4857 ExceptSpec.CalledDecl(CopyAssign); 4858 } 4859 } 4860 4861 // An implicitly-declared copy assignment operator is an inline public 4862 // member of its class. 4863 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4864 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4865 CXXMethodDecl *CopyAssignment 4866 = CXXMethodDecl::Create(Context, ClassDecl, NameInfo, 4867 Context.getFunctionType(RetType, &ArgType, 1, 4868 false, 0, 4869 ExceptSpec.hasExceptionSpecification(), 4870 ExceptSpec.hasAnyExceptionSpecification(), 4871 ExceptSpec.size(), 4872 ExceptSpec.data(), 4873 FunctionType::ExtInfo()), 4874 /*TInfo=*/0, /*isStatic=*/false, 4875 /*StorageClassAsWritten=*/FunctionDecl::None, 4876 /*isInline=*/true); 4877 CopyAssignment->setAccess(AS_public); 4878 CopyAssignment->setImplicit(); 4879 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4880 CopyAssignment->setCopyAssignment(true); 4881 4882 // Add the parameter to the operator. 4883 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4884 ClassDecl->getLocation(), 4885 /*Id=*/0, 4886 ArgType, /*TInfo=*/0, 4887 VarDecl::None, 4888 VarDecl::None, 0); 4889 CopyAssignment->setParams(&FromParam, 1); 4890 4891 // Note that we have added this copy-assignment operator. 4892 ClassDecl->setDeclaredCopyAssignment(true); 4893 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 4894 4895 if (Scope *S = getScopeForContext(ClassDecl)) 4896 PushOnScopeChains(CopyAssignment, S, false); 4897 ClassDecl->addDecl(CopyAssignment); 4898 4899 AddOverriddenMethods(ClassDecl, CopyAssignment); 4900 return CopyAssignment; 4901} 4902 4903void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4904 CXXMethodDecl *CopyAssignOperator) { 4905 assert((CopyAssignOperator->isImplicit() && 4906 CopyAssignOperator->isOverloadedOperator() && 4907 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4908 !CopyAssignOperator->isUsed(false)) && 4909 "DefineImplicitCopyAssignment called for wrong function"); 4910 4911 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4912 4913 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4914 CopyAssignOperator->setInvalidDecl(); 4915 return; 4916 } 4917 4918 CopyAssignOperator->setUsed(); 4919 4920 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4921 ErrorTrap Trap(*this); 4922 4923 // C++0x [class.copy]p30: 4924 // The implicitly-defined or explicitly-defaulted copy assignment operator 4925 // for a non-union class X performs memberwise copy assignment of its 4926 // subobjects. The direct base classes of X are assigned first, in the 4927 // order of their declaration in the base-specifier-list, and then the 4928 // immediate non-static data members of X are assigned, in the order in 4929 // which they were declared in the class definition. 4930 4931 // The statements that form the synthesized function body. 4932 ASTOwningVector<Stmt*> Statements(*this); 4933 4934 // The parameter for the "other" object, which we are copying from. 4935 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4936 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4937 QualType OtherRefType = Other->getType(); 4938 if (const LValueReferenceType *OtherRef 4939 = OtherRefType->getAs<LValueReferenceType>()) { 4940 OtherRefType = OtherRef->getPointeeType(); 4941 OtherQuals = OtherRefType.getQualifiers(); 4942 } 4943 4944 // Our location for everything implicitly-generated. 4945 SourceLocation Loc = CopyAssignOperator->getLocation(); 4946 4947 // Construct a reference to the "other" object. We'll be using this 4948 // throughout the generated ASTs. 4949 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4950 assert(OtherRef && "Reference to parameter cannot fail!"); 4951 4952 // Construct the "this" pointer. We'll be using this throughout the generated 4953 // ASTs. 4954 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4955 assert(This && "Reference to this cannot fail!"); 4956 4957 // Assign base classes. 4958 bool Invalid = false; 4959 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4960 E = ClassDecl->bases_end(); Base != E; ++Base) { 4961 // Form the assignment: 4962 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4963 QualType BaseType = Base->getType().getUnqualifiedType(); 4964 CXXRecordDecl *BaseClassDecl = 0; 4965 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4966 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4967 else { 4968 Invalid = true; 4969 continue; 4970 } 4971 4972 CXXCastPath BasePath; 4973 BasePath.push_back(Base); 4974 4975 // Construct the "from" expression, which is an implicit cast to the 4976 // appropriately-qualified base type. 4977 Expr *From = OtherRef->Retain(); 4978 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 4979 CK_UncheckedDerivedToBase, 4980 VK_LValue, &BasePath); 4981 4982 // Dereference "this". 4983 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 4984 4985 // Implicitly cast "this" to the appropriately-qualified base type. 4986 Expr *ToE = To.takeAs<Expr>(); 4987 ImpCastExprToType(ToE, 4988 Context.getCVRQualifiedType(BaseType, 4989 CopyAssignOperator->getTypeQualifiers()), 4990 CK_UncheckedDerivedToBase, 4991 VK_LValue, &BasePath); 4992 To = Owned(ToE); 4993 4994 // Build the copy. 4995 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 4996 To.get(), From, 4997 /*CopyingBaseSubobject=*/true); 4998 if (Copy.isInvalid()) { 4999 Diag(CurrentLocation, diag::note_member_synthesized_at) 5000 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5001 CopyAssignOperator->setInvalidDecl(); 5002 return; 5003 } 5004 5005 // Success! Record the copy. 5006 Statements.push_back(Copy.takeAs<Expr>()); 5007 } 5008 5009 // \brief Reference to the __builtin_memcpy function. 5010 Expr *BuiltinMemCpyRef = 0; 5011 // \brief Reference to the __builtin_objc_memmove_collectable function. 5012 Expr *CollectableMemCpyRef = 0; 5013 5014 // Assign non-static members. 5015 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5016 FieldEnd = ClassDecl->field_end(); 5017 Field != FieldEnd; ++Field) { 5018 // Check for members of reference type; we can't copy those. 5019 if (Field->getType()->isReferenceType()) { 5020 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5021 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5022 Diag(Field->getLocation(), diag::note_declared_at); 5023 Diag(CurrentLocation, diag::note_member_synthesized_at) 5024 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5025 Invalid = true; 5026 continue; 5027 } 5028 5029 // Check for members of const-qualified, non-class type. 5030 QualType BaseType = Context.getBaseElementType(Field->getType()); 5031 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5032 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5033 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5034 Diag(Field->getLocation(), diag::note_declared_at); 5035 Diag(CurrentLocation, diag::note_member_synthesized_at) 5036 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5037 Invalid = true; 5038 continue; 5039 } 5040 5041 QualType FieldType = Field->getType().getNonReferenceType(); 5042 if (FieldType->isIncompleteArrayType()) { 5043 assert(ClassDecl->hasFlexibleArrayMember() && 5044 "Incomplete array type is not valid"); 5045 continue; 5046 } 5047 5048 // Build references to the field in the object we're copying from and to. 5049 CXXScopeSpec SS; // Intentionally empty 5050 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5051 LookupMemberName); 5052 MemberLookup.addDecl(*Field); 5053 MemberLookup.resolveKind(); 5054 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5055 Loc, /*IsArrow=*/false, 5056 SS, 0, MemberLookup, 0); 5057 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5058 Loc, /*IsArrow=*/true, 5059 SS, 0, MemberLookup, 0); 5060 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5061 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5062 5063 // If the field should be copied with __builtin_memcpy rather than via 5064 // explicit assignments, do so. This optimization only applies for arrays 5065 // of scalars and arrays of class type with trivial copy-assignment 5066 // operators. 5067 if (FieldType->isArrayType() && 5068 (!BaseType->isRecordType() || 5069 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5070 ->hasTrivialCopyAssignment())) { 5071 // Compute the size of the memory buffer to be copied. 5072 QualType SizeType = Context.getSizeType(); 5073 llvm::APInt Size(Context.getTypeSize(SizeType), 5074 Context.getTypeSizeInChars(BaseType).getQuantity()); 5075 for (const ConstantArrayType *Array 5076 = Context.getAsConstantArrayType(FieldType); 5077 Array; 5078 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5079 llvm::APInt ArraySize = Array->getSize(); 5080 ArraySize.zextOrTrunc(Size.getBitWidth()); 5081 Size *= ArraySize; 5082 } 5083 5084 // Take the address of the field references for "from" and "to". 5085 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5086 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5087 5088 bool NeedsCollectableMemCpy = 5089 (BaseType->isRecordType() && 5090 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5091 5092 if (NeedsCollectableMemCpy) { 5093 if (!CollectableMemCpyRef) { 5094 // Create a reference to the __builtin_objc_memmove_collectable function. 5095 LookupResult R(*this, 5096 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5097 Loc, LookupOrdinaryName); 5098 LookupName(R, TUScope, true); 5099 5100 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5101 if (!CollectableMemCpy) { 5102 // Something went horribly wrong earlier, and we will have 5103 // complained about it. 5104 Invalid = true; 5105 continue; 5106 } 5107 5108 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5109 CollectableMemCpy->getType(), 5110 Loc, 0).takeAs<Expr>(); 5111 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5112 } 5113 } 5114 // Create a reference to the __builtin_memcpy builtin function. 5115 else if (!BuiltinMemCpyRef) { 5116 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5117 LookupOrdinaryName); 5118 LookupName(R, TUScope, true); 5119 5120 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5121 if (!BuiltinMemCpy) { 5122 // Something went horribly wrong earlier, and we will have complained 5123 // about it. 5124 Invalid = true; 5125 continue; 5126 } 5127 5128 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5129 BuiltinMemCpy->getType(), 5130 Loc, 0).takeAs<Expr>(); 5131 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5132 } 5133 5134 ASTOwningVector<Expr*> CallArgs(*this); 5135 CallArgs.push_back(To.takeAs<Expr>()); 5136 CallArgs.push_back(From.takeAs<Expr>()); 5137 CallArgs.push_back(new (Context) IntegerLiteral(Size, SizeType, Loc)); 5138 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 5139 Commas.push_back(Loc); 5140 Commas.push_back(Loc); 5141 ExprResult Call = ExprError(); 5142 if (NeedsCollectableMemCpy) 5143 Call = ActOnCallExpr(/*Scope=*/0, 5144 CollectableMemCpyRef, 5145 Loc, move_arg(CallArgs), 5146 Commas.data(), Loc); 5147 else 5148 Call = ActOnCallExpr(/*Scope=*/0, 5149 BuiltinMemCpyRef, 5150 Loc, move_arg(CallArgs), 5151 Commas.data(), Loc); 5152 5153 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5154 Statements.push_back(Call.takeAs<Expr>()); 5155 continue; 5156 } 5157 5158 // Build the copy of this field. 5159 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5160 To.get(), From.get(), 5161 /*CopyingBaseSubobject=*/false); 5162 if (Copy.isInvalid()) { 5163 Diag(CurrentLocation, diag::note_member_synthesized_at) 5164 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5165 CopyAssignOperator->setInvalidDecl(); 5166 return; 5167 } 5168 5169 // Success! Record the copy. 5170 Statements.push_back(Copy.takeAs<Stmt>()); 5171 } 5172 5173 if (!Invalid) { 5174 // Add a "return *this;" 5175 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5176 5177 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5178 if (Return.isInvalid()) 5179 Invalid = true; 5180 else { 5181 Statements.push_back(Return.takeAs<Stmt>()); 5182 5183 if (Trap.hasErrorOccurred()) { 5184 Diag(CurrentLocation, diag::note_member_synthesized_at) 5185 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5186 Invalid = true; 5187 } 5188 } 5189 } 5190 5191 if (Invalid) { 5192 CopyAssignOperator->setInvalidDecl(); 5193 return; 5194 } 5195 5196 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5197 /*isStmtExpr=*/false); 5198 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5199 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5200} 5201 5202CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5203 CXXRecordDecl *ClassDecl) { 5204 // C++ [class.copy]p4: 5205 // If the class definition does not explicitly declare a copy 5206 // constructor, one is declared implicitly. 5207 5208 // C++ [class.copy]p5: 5209 // The implicitly-declared copy constructor for a class X will 5210 // have the form 5211 // 5212 // X::X(const X&) 5213 // 5214 // if 5215 bool HasConstCopyConstructor = true; 5216 5217 // -- each direct or virtual base class B of X has a copy 5218 // constructor whose first parameter is of type const B& or 5219 // const volatile B&, and 5220 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5221 BaseEnd = ClassDecl->bases_end(); 5222 HasConstCopyConstructor && Base != BaseEnd; 5223 ++Base) { 5224 // Virtual bases are handled below. 5225 if (Base->isVirtual()) 5226 continue; 5227 5228 CXXRecordDecl *BaseClassDecl 5229 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5230 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5231 DeclareImplicitCopyConstructor(BaseClassDecl); 5232 5233 HasConstCopyConstructor 5234 = BaseClassDecl->hasConstCopyConstructor(Context); 5235 } 5236 5237 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5238 BaseEnd = ClassDecl->vbases_end(); 5239 HasConstCopyConstructor && Base != BaseEnd; 5240 ++Base) { 5241 CXXRecordDecl *BaseClassDecl 5242 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5243 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5244 DeclareImplicitCopyConstructor(BaseClassDecl); 5245 5246 HasConstCopyConstructor 5247 = BaseClassDecl->hasConstCopyConstructor(Context); 5248 } 5249 5250 // -- for all the nonstatic data members of X that are of a 5251 // class type M (or array thereof), each such class type 5252 // has a copy constructor whose first parameter is of type 5253 // const M& or const volatile M&. 5254 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5255 FieldEnd = ClassDecl->field_end(); 5256 HasConstCopyConstructor && Field != FieldEnd; 5257 ++Field) { 5258 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5259 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5260 CXXRecordDecl *FieldClassDecl 5261 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5262 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5263 DeclareImplicitCopyConstructor(FieldClassDecl); 5264 5265 HasConstCopyConstructor 5266 = FieldClassDecl->hasConstCopyConstructor(Context); 5267 } 5268 } 5269 5270 // Otherwise, the implicitly declared copy constructor will have 5271 // the form 5272 // 5273 // X::X(X&) 5274 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5275 QualType ArgType = ClassType; 5276 if (HasConstCopyConstructor) 5277 ArgType = ArgType.withConst(); 5278 ArgType = Context.getLValueReferenceType(ArgType); 5279 5280 // C++ [except.spec]p14: 5281 // An implicitly declared special member function (Clause 12) shall have an 5282 // exception-specification. [...] 5283 ImplicitExceptionSpecification ExceptSpec(Context); 5284 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5285 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5286 BaseEnd = ClassDecl->bases_end(); 5287 Base != BaseEnd; 5288 ++Base) { 5289 // Virtual bases are handled below. 5290 if (Base->isVirtual()) 5291 continue; 5292 5293 CXXRecordDecl *BaseClassDecl 5294 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5295 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5296 DeclareImplicitCopyConstructor(BaseClassDecl); 5297 5298 if (CXXConstructorDecl *CopyConstructor 5299 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5300 ExceptSpec.CalledDecl(CopyConstructor); 5301 } 5302 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5303 BaseEnd = ClassDecl->vbases_end(); 5304 Base != BaseEnd; 5305 ++Base) { 5306 CXXRecordDecl *BaseClassDecl 5307 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5308 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5309 DeclareImplicitCopyConstructor(BaseClassDecl); 5310 5311 if (CXXConstructorDecl *CopyConstructor 5312 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5313 ExceptSpec.CalledDecl(CopyConstructor); 5314 } 5315 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5316 FieldEnd = ClassDecl->field_end(); 5317 Field != FieldEnd; 5318 ++Field) { 5319 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5320 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5321 CXXRecordDecl *FieldClassDecl 5322 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5323 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5324 DeclareImplicitCopyConstructor(FieldClassDecl); 5325 5326 if (CXXConstructorDecl *CopyConstructor 5327 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5328 ExceptSpec.CalledDecl(CopyConstructor); 5329 } 5330 } 5331 5332 // An implicitly-declared copy constructor is an inline public 5333 // member of its class. 5334 DeclarationName Name 5335 = Context.DeclarationNames.getCXXConstructorName( 5336 Context.getCanonicalType(ClassType)); 5337 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5338 CXXConstructorDecl *CopyConstructor 5339 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 5340 Context.getFunctionType(Context.VoidTy, 5341 &ArgType, 1, 5342 false, 0, 5343 ExceptSpec.hasExceptionSpecification(), 5344 ExceptSpec.hasAnyExceptionSpecification(), 5345 ExceptSpec.size(), 5346 ExceptSpec.data(), 5347 FunctionType::ExtInfo()), 5348 /*TInfo=*/0, 5349 /*isExplicit=*/false, 5350 /*isInline=*/true, 5351 /*isImplicitlyDeclared=*/true); 5352 CopyConstructor->setAccess(AS_public); 5353 CopyConstructor->setImplicit(); 5354 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5355 5356 // Note that we have declared this constructor. 5357 ClassDecl->setDeclaredCopyConstructor(true); 5358 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5359 5360 // Add the parameter to the constructor. 5361 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5362 ClassDecl->getLocation(), 5363 /*IdentifierInfo=*/0, 5364 ArgType, /*TInfo=*/0, 5365 VarDecl::None, 5366 VarDecl::None, 0); 5367 CopyConstructor->setParams(&FromParam, 1); 5368 if (Scope *S = getScopeForContext(ClassDecl)) 5369 PushOnScopeChains(CopyConstructor, S, false); 5370 ClassDecl->addDecl(CopyConstructor); 5371 5372 return CopyConstructor; 5373} 5374 5375void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5376 CXXConstructorDecl *CopyConstructor, 5377 unsigned TypeQuals) { 5378 assert((CopyConstructor->isImplicit() && 5379 CopyConstructor->isCopyConstructor(TypeQuals) && 5380 !CopyConstructor->isUsed(false)) && 5381 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5382 5383 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5384 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5385 5386 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5387 ErrorTrap Trap(*this); 5388 5389 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5390 Trap.hasErrorOccurred()) { 5391 Diag(CurrentLocation, diag::note_member_synthesized_at) 5392 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5393 CopyConstructor->setInvalidDecl(); 5394 } else { 5395 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5396 CopyConstructor->getLocation(), 5397 MultiStmtArg(*this, 0, 0), 5398 /*isStmtExpr=*/false) 5399 .takeAs<Stmt>()); 5400 } 5401 5402 CopyConstructor->setUsed(); 5403} 5404 5405ExprResult 5406Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5407 CXXConstructorDecl *Constructor, 5408 MultiExprArg ExprArgs, 5409 bool RequiresZeroInit, 5410 unsigned ConstructKind) { 5411 bool Elidable = false; 5412 5413 // C++0x [class.copy]p34: 5414 // When certain criteria are met, an implementation is allowed to 5415 // omit the copy/move construction of a class object, even if the 5416 // copy/move constructor and/or destructor for the object have 5417 // side effects. [...] 5418 // - when a temporary class object that has not been bound to a 5419 // reference (12.2) would be copied/moved to a class object 5420 // with the same cv-unqualified type, the copy/move operation 5421 // can be omitted by constructing the temporary object 5422 // directly into the target of the omitted copy/move 5423 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5424 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5425 Elidable = SubExpr->isTemporaryObject() && 5426 ConstructKind == CXXConstructExpr::CK_Complete && 5427 Context.hasSameUnqualifiedType(SubExpr->getType(), 5428 Context.getTypeDeclType(Constructor->getParent())); 5429 } 5430 5431 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5432 Elidable, move(ExprArgs), RequiresZeroInit, 5433 ConstructKind); 5434} 5435 5436/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5437/// including handling of its default argument expressions. 5438ExprResult 5439Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5440 CXXConstructorDecl *Constructor, bool Elidable, 5441 MultiExprArg ExprArgs, 5442 bool RequiresZeroInit, 5443 unsigned ConstructKind) { 5444 unsigned NumExprs = ExprArgs.size(); 5445 Expr **Exprs = (Expr **)ExprArgs.release(); 5446 5447 MarkDeclarationReferenced(ConstructLoc, Constructor); 5448 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5449 Constructor, Elidable, Exprs, NumExprs, 5450 RequiresZeroInit, 5451 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind))); 5452} 5453 5454bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5455 CXXConstructorDecl *Constructor, 5456 MultiExprArg Exprs) { 5457 ExprResult TempResult = 5458 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5459 move(Exprs), false, CXXConstructExpr::CK_Complete); 5460 if (TempResult.isInvalid()) 5461 return true; 5462 5463 Expr *Temp = TempResult.takeAs<Expr>(); 5464 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5465 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 5466 VD->setInit(Temp); 5467 5468 return false; 5469} 5470 5471void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5472 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5473 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5474 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5475 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5476 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5477 CheckDestructorAccess(VD->getLocation(), Destructor, 5478 PDiag(diag::err_access_dtor_var) 5479 << VD->getDeclName() 5480 << VD->getType()); 5481 5482 if (!VD->isInvalidDecl() && VD->hasGlobalStorage()) 5483 Diag(VD->getLocation(), diag::warn_global_destructor); 5484 } 5485} 5486 5487/// AddCXXDirectInitializerToDecl - This action is called immediately after 5488/// ActOnDeclarator, when a C++ direct initializer is present. 5489/// e.g: "int x(1);" 5490void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 5491 SourceLocation LParenLoc, 5492 MultiExprArg Exprs, 5493 SourceLocation *CommaLocs, 5494 SourceLocation RParenLoc) { 5495 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5496 5497 // If there is no declaration, there was an error parsing it. Just ignore 5498 // the initializer. 5499 if (RealDecl == 0) 5500 return; 5501 5502 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5503 if (!VDecl) { 5504 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5505 RealDecl->setInvalidDecl(); 5506 return; 5507 } 5508 5509 // We will represent direct-initialization similarly to copy-initialization: 5510 // int x(1); -as-> int x = 1; 5511 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5512 // 5513 // Clients that want to distinguish between the two forms, can check for 5514 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5515 // A major benefit is that clients that don't particularly care about which 5516 // exactly form was it (like the CodeGen) can handle both cases without 5517 // special case code. 5518 5519 // C++ 8.5p11: 5520 // The form of initialization (using parentheses or '=') is generally 5521 // insignificant, but does matter when the entity being initialized has a 5522 // class type. 5523 5524 if (!VDecl->getType()->isDependentType() && 5525 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5526 diag::err_typecheck_decl_incomplete_type)) { 5527 VDecl->setInvalidDecl(); 5528 return; 5529 } 5530 5531 // The variable can not have an abstract class type. 5532 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5533 diag::err_abstract_type_in_decl, 5534 AbstractVariableType)) 5535 VDecl->setInvalidDecl(); 5536 5537 const VarDecl *Def; 5538 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5539 Diag(VDecl->getLocation(), diag::err_redefinition) 5540 << VDecl->getDeclName(); 5541 Diag(Def->getLocation(), diag::note_previous_definition); 5542 VDecl->setInvalidDecl(); 5543 return; 5544 } 5545 5546 // C++ [class.static.data]p4 5547 // If a static data member is of const integral or const 5548 // enumeration type, its declaration in the class definition can 5549 // specify a constant-initializer which shall be an integral 5550 // constant expression (5.19). In that case, the member can appear 5551 // in integral constant expressions. The member shall still be 5552 // defined in a namespace scope if it is used in the program and the 5553 // namespace scope definition shall not contain an initializer. 5554 // 5555 // We already performed a redefinition check above, but for static 5556 // data members we also need to check whether there was an in-class 5557 // declaration with an initializer. 5558 const VarDecl* PrevInit = 0; 5559 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5560 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5561 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5562 return; 5563 } 5564 5565 // If either the declaration has a dependent type or if any of the 5566 // expressions is type-dependent, we represent the initialization 5567 // via a ParenListExpr for later use during template instantiation. 5568 if (VDecl->getType()->isDependentType() || 5569 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5570 // Let clients know that initialization was done with a direct initializer. 5571 VDecl->setCXXDirectInitializer(true); 5572 5573 // Store the initialization expressions as a ParenListExpr. 5574 unsigned NumExprs = Exprs.size(); 5575 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5576 (Expr **)Exprs.release(), 5577 NumExprs, RParenLoc)); 5578 return; 5579 } 5580 5581 // Capture the variable that is being initialized and the style of 5582 // initialization. 5583 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5584 5585 // FIXME: Poor source location information. 5586 InitializationKind Kind 5587 = InitializationKind::CreateDirect(VDecl->getLocation(), 5588 LParenLoc, RParenLoc); 5589 5590 InitializationSequence InitSeq(*this, Entity, Kind, 5591 Exprs.get(), Exprs.size()); 5592 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5593 if (Result.isInvalid()) { 5594 VDecl->setInvalidDecl(); 5595 return; 5596 } 5597 5598 Result = MaybeCreateCXXExprWithTemporaries(Result.get()); 5599 VDecl->setInit(Result.takeAs<Expr>()); 5600 VDecl->setCXXDirectInitializer(true); 5601 5602 if (!VDecl->isInvalidDecl() && 5603 !VDecl->getDeclContext()->isDependentContext() && 5604 VDecl->hasGlobalStorage() && 5605 !VDecl->getInit()->isConstantInitializer(Context, 5606 VDecl->getType()->isReferenceType())) 5607 Diag(VDecl->getLocation(), diag::warn_global_constructor) 5608 << VDecl->getInit()->getSourceRange(); 5609 5610 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5611 FinalizeVarWithDestructor(VDecl, Record); 5612} 5613 5614/// \brief Given a constructor and the set of arguments provided for the 5615/// constructor, convert the arguments and add any required default arguments 5616/// to form a proper call to this constructor. 5617/// 5618/// \returns true if an error occurred, false otherwise. 5619bool 5620Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5621 MultiExprArg ArgsPtr, 5622 SourceLocation Loc, 5623 ASTOwningVector<Expr*> &ConvertedArgs) { 5624 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5625 unsigned NumArgs = ArgsPtr.size(); 5626 Expr **Args = (Expr **)ArgsPtr.get(); 5627 5628 const FunctionProtoType *Proto 5629 = Constructor->getType()->getAs<FunctionProtoType>(); 5630 assert(Proto && "Constructor without a prototype?"); 5631 unsigned NumArgsInProto = Proto->getNumArgs(); 5632 5633 // If too few arguments are available, we'll fill in the rest with defaults. 5634 if (NumArgs < NumArgsInProto) 5635 ConvertedArgs.reserve(NumArgsInProto); 5636 else 5637 ConvertedArgs.reserve(NumArgs); 5638 5639 VariadicCallType CallType = 5640 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5641 llvm::SmallVector<Expr *, 8> AllArgs; 5642 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5643 Proto, 0, Args, NumArgs, AllArgs, 5644 CallType); 5645 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5646 ConvertedArgs.push_back(AllArgs[i]); 5647 return Invalid; 5648} 5649 5650static inline bool 5651CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5652 const FunctionDecl *FnDecl) { 5653 const DeclContext *DC = FnDecl->getDeclContext()->getLookupContext(); 5654 if (isa<NamespaceDecl>(DC)) { 5655 return SemaRef.Diag(FnDecl->getLocation(), 5656 diag::err_operator_new_delete_declared_in_namespace) 5657 << FnDecl->getDeclName(); 5658 } 5659 5660 if (isa<TranslationUnitDecl>(DC) && 5661 FnDecl->getStorageClass() == FunctionDecl::Static) { 5662 return SemaRef.Diag(FnDecl->getLocation(), 5663 diag::err_operator_new_delete_declared_static) 5664 << FnDecl->getDeclName(); 5665 } 5666 5667 return false; 5668} 5669 5670static inline bool 5671CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5672 CanQualType ExpectedResultType, 5673 CanQualType ExpectedFirstParamType, 5674 unsigned DependentParamTypeDiag, 5675 unsigned InvalidParamTypeDiag) { 5676 QualType ResultType = 5677 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5678 5679 // Check that the result type is not dependent. 5680 if (ResultType->isDependentType()) 5681 return SemaRef.Diag(FnDecl->getLocation(), 5682 diag::err_operator_new_delete_dependent_result_type) 5683 << FnDecl->getDeclName() << ExpectedResultType; 5684 5685 // Check that the result type is what we expect. 5686 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5687 return SemaRef.Diag(FnDecl->getLocation(), 5688 diag::err_operator_new_delete_invalid_result_type) 5689 << FnDecl->getDeclName() << ExpectedResultType; 5690 5691 // A function template must have at least 2 parameters. 5692 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5693 return SemaRef.Diag(FnDecl->getLocation(), 5694 diag::err_operator_new_delete_template_too_few_parameters) 5695 << FnDecl->getDeclName(); 5696 5697 // The function decl must have at least 1 parameter. 5698 if (FnDecl->getNumParams() == 0) 5699 return SemaRef.Diag(FnDecl->getLocation(), 5700 diag::err_operator_new_delete_too_few_parameters) 5701 << FnDecl->getDeclName(); 5702 5703 // Check the the first parameter type is not dependent. 5704 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5705 if (FirstParamType->isDependentType()) 5706 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5707 << FnDecl->getDeclName() << ExpectedFirstParamType; 5708 5709 // Check that the first parameter type is what we expect. 5710 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5711 ExpectedFirstParamType) 5712 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5713 << FnDecl->getDeclName() << ExpectedFirstParamType; 5714 5715 return false; 5716} 5717 5718static bool 5719CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5720 // C++ [basic.stc.dynamic.allocation]p1: 5721 // A program is ill-formed if an allocation function is declared in a 5722 // namespace scope other than global scope or declared static in global 5723 // scope. 5724 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5725 return true; 5726 5727 CanQualType SizeTy = 5728 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5729 5730 // C++ [basic.stc.dynamic.allocation]p1: 5731 // The return type shall be void*. The first parameter shall have type 5732 // std::size_t. 5733 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5734 SizeTy, 5735 diag::err_operator_new_dependent_param_type, 5736 diag::err_operator_new_param_type)) 5737 return true; 5738 5739 // C++ [basic.stc.dynamic.allocation]p1: 5740 // The first parameter shall not have an associated default argument. 5741 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5742 return SemaRef.Diag(FnDecl->getLocation(), 5743 diag::err_operator_new_default_arg) 5744 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5745 5746 return false; 5747} 5748 5749static bool 5750CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5751 // C++ [basic.stc.dynamic.deallocation]p1: 5752 // A program is ill-formed if deallocation functions are declared in a 5753 // namespace scope other than global scope or declared static in global 5754 // scope. 5755 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5756 return true; 5757 5758 // C++ [basic.stc.dynamic.deallocation]p2: 5759 // Each deallocation function shall return void and its first parameter 5760 // shall be void*. 5761 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5762 SemaRef.Context.VoidPtrTy, 5763 diag::err_operator_delete_dependent_param_type, 5764 diag::err_operator_delete_param_type)) 5765 return true; 5766 5767 return false; 5768} 5769 5770/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5771/// of this overloaded operator is well-formed. If so, returns false; 5772/// otherwise, emits appropriate diagnostics and returns true. 5773bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5774 assert(FnDecl && FnDecl->isOverloadedOperator() && 5775 "Expected an overloaded operator declaration"); 5776 5777 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5778 5779 // C++ [over.oper]p5: 5780 // The allocation and deallocation functions, operator new, 5781 // operator new[], operator delete and operator delete[], are 5782 // described completely in 3.7.3. The attributes and restrictions 5783 // found in the rest of this subclause do not apply to them unless 5784 // explicitly stated in 3.7.3. 5785 if (Op == OO_Delete || Op == OO_Array_Delete) 5786 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5787 5788 if (Op == OO_New || Op == OO_Array_New) 5789 return CheckOperatorNewDeclaration(*this, FnDecl); 5790 5791 // C++ [over.oper]p6: 5792 // An operator function shall either be a non-static member 5793 // function or be a non-member function and have at least one 5794 // parameter whose type is a class, a reference to a class, an 5795 // enumeration, or a reference to an enumeration. 5796 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5797 if (MethodDecl->isStatic()) 5798 return Diag(FnDecl->getLocation(), 5799 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5800 } else { 5801 bool ClassOrEnumParam = false; 5802 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5803 ParamEnd = FnDecl->param_end(); 5804 Param != ParamEnd; ++Param) { 5805 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5806 if (ParamType->isDependentType() || ParamType->isRecordType() || 5807 ParamType->isEnumeralType()) { 5808 ClassOrEnumParam = true; 5809 break; 5810 } 5811 } 5812 5813 if (!ClassOrEnumParam) 5814 return Diag(FnDecl->getLocation(), 5815 diag::err_operator_overload_needs_class_or_enum) 5816 << FnDecl->getDeclName(); 5817 } 5818 5819 // C++ [over.oper]p8: 5820 // An operator function cannot have default arguments (8.3.6), 5821 // except where explicitly stated below. 5822 // 5823 // Only the function-call operator allows default arguments 5824 // (C++ [over.call]p1). 5825 if (Op != OO_Call) { 5826 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5827 Param != FnDecl->param_end(); ++Param) { 5828 if ((*Param)->hasDefaultArg()) 5829 return Diag((*Param)->getLocation(), 5830 diag::err_operator_overload_default_arg) 5831 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5832 } 5833 } 5834 5835 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5836 { false, false, false } 5837#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5838 , { Unary, Binary, MemberOnly } 5839#include "clang/Basic/OperatorKinds.def" 5840 }; 5841 5842 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5843 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5844 bool MustBeMemberOperator = OperatorUses[Op][2]; 5845 5846 // C++ [over.oper]p8: 5847 // [...] Operator functions cannot have more or fewer parameters 5848 // than the number required for the corresponding operator, as 5849 // described in the rest of this subclause. 5850 unsigned NumParams = FnDecl->getNumParams() 5851 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5852 if (Op != OO_Call && 5853 ((NumParams == 1 && !CanBeUnaryOperator) || 5854 (NumParams == 2 && !CanBeBinaryOperator) || 5855 (NumParams < 1) || (NumParams > 2))) { 5856 // We have the wrong number of parameters. 5857 unsigned ErrorKind; 5858 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5859 ErrorKind = 2; // 2 -> unary or binary. 5860 } else if (CanBeUnaryOperator) { 5861 ErrorKind = 0; // 0 -> unary 5862 } else { 5863 assert(CanBeBinaryOperator && 5864 "All non-call overloaded operators are unary or binary!"); 5865 ErrorKind = 1; // 1 -> binary 5866 } 5867 5868 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5869 << FnDecl->getDeclName() << NumParams << ErrorKind; 5870 } 5871 5872 // Overloaded operators other than operator() cannot be variadic. 5873 if (Op != OO_Call && 5874 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5875 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5876 << FnDecl->getDeclName(); 5877 } 5878 5879 // Some operators must be non-static member functions. 5880 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5881 return Diag(FnDecl->getLocation(), 5882 diag::err_operator_overload_must_be_member) 5883 << FnDecl->getDeclName(); 5884 } 5885 5886 // C++ [over.inc]p1: 5887 // The user-defined function called operator++ implements the 5888 // prefix and postfix ++ operator. If this function is a member 5889 // function with no parameters, or a non-member function with one 5890 // parameter of class or enumeration type, it defines the prefix 5891 // increment operator ++ for objects of that type. If the function 5892 // is a member function with one parameter (which shall be of type 5893 // int) or a non-member function with two parameters (the second 5894 // of which shall be of type int), it defines the postfix 5895 // increment operator ++ for objects of that type. 5896 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5897 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5898 bool ParamIsInt = false; 5899 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5900 ParamIsInt = BT->getKind() == BuiltinType::Int; 5901 5902 if (!ParamIsInt) 5903 return Diag(LastParam->getLocation(), 5904 diag::err_operator_overload_post_incdec_must_be_int) 5905 << LastParam->getType() << (Op == OO_MinusMinus); 5906 } 5907 5908 // Notify the class if it got an assignment operator. 5909 if (Op == OO_Equal) { 5910 // Would have returned earlier otherwise. 5911 assert(isa<CXXMethodDecl>(FnDecl) && 5912 "Overloaded = not member, but not filtered."); 5913 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5914 Method->getParent()->addedAssignmentOperator(Context, Method); 5915 } 5916 5917 return false; 5918} 5919 5920/// CheckLiteralOperatorDeclaration - Check whether the declaration 5921/// of this literal operator function is well-formed. If so, returns 5922/// false; otherwise, emits appropriate diagnostics and returns true. 5923bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5924 DeclContext *DC = FnDecl->getDeclContext(); 5925 Decl::Kind Kind = DC->getDeclKind(); 5926 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5927 Kind != Decl::LinkageSpec) { 5928 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5929 << FnDecl->getDeclName(); 5930 return true; 5931 } 5932 5933 bool Valid = false; 5934 5935 // template <char...> type operator "" name() is the only valid template 5936 // signature, and the only valid signature with no parameters. 5937 if (FnDecl->param_size() == 0) { 5938 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5939 // Must have only one template parameter 5940 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5941 if (Params->size() == 1) { 5942 NonTypeTemplateParmDecl *PmDecl = 5943 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5944 5945 // The template parameter must be a char parameter pack. 5946 // FIXME: This test will always fail because non-type parameter packs 5947 // have not been implemented. 5948 if (PmDecl && PmDecl->isTemplateParameterPack() && 5949 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5950 Valid = true; 5951 } 5952 } 5953 } else { 5954 // Check the first parameter 5955 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5956 5957 QualType T = (*Param)->getType(); 5958 5959 // unsigned long long int, long double, and any character type are allowed 5960 // as the only parameters. 5961 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5962 Context.hasSameType(T, Context.LongDoubleTy) || 5963 Context.hasSameType(T, Context.CharTy) || 5964 Context.hasSameType(T, Context.WCharTy) || 5965 Context.hasSameType(T, Context.Char16Ty) || 5966 Context.hasSameType(T, Context.Char32Ty)) { 5967 if (++Param == FnDecl->param_end()) 5968 Valid = true; 5969 goto FinishedParams; 5970 } 5971 5972 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5973 const PointerType *PT = T->getAs<PointerType>(); 5974 if (!PT) 5975 goto FinishedParams; 5976 T = PT->getPointeeType(); 5977 if (!T.isConstQualified()) 5978 goto FinishedParams; 5979 T = T.getUnqualifiedType(); 5980 5981 // Move on to the second parameter; 5982 ++Param; 5983 5984 // If there is no second parameter, the first must be a const char * 5985 if (Param == FnDecl->param_end()) { 5986 if (Context.hasSameType(T, Context.CharTy)) 5987 Valid = true; 5988 goto FinishedParams; 5989 } 5990 5991 // const char *, const wchar_t*, const char16_t*, and const char32_t* 5992 // are allowed as the first parameter to a two-parameter function 5993 if (!(Context.hasSameType(T, Context.CharTy) || 5994 Context.hasSameType(T, Context.WCharTy) || 5995 Context.hasSameType(T, Context.Char16Ty) || 5996 Context.hasSameType(T, Context.Char32Ty))) 5997 goto FinishedParams; 5998 5999 // The second and final parameter must be an std::size_t 6000 T = (*Param)->getType().getUnqualifiedType(); 6001 if (Context.hasSameType(T, Context.getSizeType()) && 6002 ++Param == FnDecl->param_end()) 6003 Valid = true; 6004 } 6005 6006 // FIXME: This diagnostic is absolutely terrible. 6007FinishedParams: 6008 if (!Valid) { 6009 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 6010 << FnDecl->getDeclName(); 6011 return true; 6012 } 6013 6014 return false; 6015} 6016 6017/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6018/// linkage specification, including the language and (if present) 6019/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6020/// the location of the language string literal, which is provided 6021/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6022/// the '{' brace. Otherwise, this linkage specification does not 6023/// have any braces. 6024Decl *Sema::ActOnStartLinkageSpecification(Scope *S, 6025 SourceLocation ExternLoc, 6026 SourceLocation LangLoc, 6027 llvm::StringRef Lang, 6028 SourceLocation LBraceLoc) { 6029 LinkageSpecDecl::LanguageIDs Language; 6030 if (Lang == "\"C\"") 6031 Language = LinkageSpecDecl::lang_c; 6032 else if (Lang == "\"C++\"") 6033 Language = LinkageSpecDecl::lang_cxx; 6034 else { 6035 Diag(LangLoc, diag::err_bad_language); 6036 return 0; 6037 } 6038 6039 // FIXME: Add all the various semantics of linkage specifications 6040 6041 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6042 LangLoc, Language, 6043 LBraceLoc.isValid()); 6044 CurContext->addDecl(D); 6045 PushDeclContext(S, D); 6046 return D; 6047} 6048 6049/// ActOnFinishLinkageSpecification - Complete the definition of 6050/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6051/// valid, it's the position of the closing '}' brace in a linkage 6052/// specification that uses braces. 6053Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6054 Decl *LinkageSpec, 6055 SourceLocation RBraceLoc) { 6056 if (LinkageSpec) 6057 PopDeclContext(); 6058 return LinkageSpec; 6059} 6060 6061/// \brief Perform semantic analysis for the variable declaration that 6062/// occurs within a C++ catch clause, returning the newly-created 6063/// variable. 6064VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 6065 TypeSourceInfo *TInfo, 6066 IdentifierInfo *Name, 6067 SourceLocation Loc, 6068 SourceRange Range) { 6069 bool Invalid = false; 6070 6071 // Arrays and functions decay. 6072 if (ExDeclType->isArrayType()) 6073 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6074 else if (ExDeclType->isFunctionType()) 6075 ExDeclType = Context.getPointerType(ExDeclType); 6076 6077 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6078 // The exception-declaration shall not denote a pointer or reference to an 6079 // incomplete type, other than [cv] void*. 6080 // N2844 forbids rvalue references. 6081 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6082 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 6083 Invalid = true; 6084 } 6085 6086 // GCC allows catching pointers and references to incomplete types 6087 // as an extension; so do we, but we warn by default. 6088 6089 QualType BaseType = ExDeclType; 6090 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6091 unsigned DK = diag::err_catch_incomplete; 6092 bool IncompleteCatchIsInvalid = true; 6093 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6094 BaseType = Ptr->getPointeeType(); 6095 Mode = 1; 6096 DK = diag::ext_catch_incomplete_ptr; 6097 IncompleteCatchIsInvalid = false; 6098 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6099 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6100 BaseType = Ref->getPointeeType(); 6101 Mode = 2; 6102 DK = diag::ext_catch_incomplete_ref; 6103 IncompleteCatchIsInvalid = false; 6104 } 6105 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6106 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6107 IncompleteCatchIsInvalid) 6108 Invalid = true; 6109 6110 if (!Invalid && !ExDeclType->isDependentType() && 6111 RequireNonAbstractType(Loc, ExDeclType, 6112 diag::err_abstract_type_in_decl, 6113 AbstractVariableType)) 6114 Invalid = true; 6115 6116 // Only the non-fragile NeXT runtime currently supports C++ catches 6117 // of ObjC types, and no runtime supports catching ObjC types by value. 6118 if (!Invalid && getLangOptions().ObjC1) { 6119 QualType T = ExDeclType; 6120 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6121 T = RT->getPointeeType(); 6122 6123 if (T->isObjCObjectType()) { 6124 Diag(Loc, diag::err_objc_object_catch); 6125 Invalid = true; 6126 } else if (T->isObjCObjectPointerType()) { 6127 if (!getLangOptions().NeXTRuntime) { 6128 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6129 Invalid = true; 6130 } else if (!getLangOptions().ObjCNonFragileABI) { 6131 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6132 Invalid = true; 6133 } 6134 } 6135 } 6136 6137 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6138 Name, ExDeclType, TInfo, VarDecl::None, 6139 VarDecl::None); 6140 ExDecl->setExceptionVariable(true); 6141 6142 if (!Invalid) { 6143 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6144 // C++ [except.handle]p16: 6145 // The object declared in an exception-declaration or, if the 6146 // exception-declaration does not specify a name, a temporary (12.2) is 6147 // copy-initialized (8.5) from the exception object. [...] 6148 // The object is destroyed when the handler exits, after the destruction 6149 // of any automatic objects initialized within the handler. 6150 // 6151 // We just pretend to initialize the object with itself, then make sure 6152 // it can be destroyed later. 6153 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6154 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6155 Loc, ExDeclType, 0); 6156 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6157 SourceLocation()); 6158 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6159 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6160 MultiExprArg(*this, &ExDeclRef, 1)); 6161 if (Result.isInvalid()) 6162 Invalid = true; 6163 else 6164 FinalizeVarWithDestructor(ExDecl, RecordTy); 6165 } 6166 } 6167 6168 if (Invalid) 6169 ExDecl->setInvalidDecl(); 6170 6171 return ExDecl; 6172} 6173 6174/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6175/// handler. 6176Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6177 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6178 QualType ExDeclType = TInfo->getType(); 6179 6180 bool Invalid = D.isInvalidType(); 6181 IdentifierInfo *II = D.getIdentifier(); 6182 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6183 LookupOrdinaryName, 6184 ForRedeclaration)) { 6185 // The scope should be freshly made just for us. There is just no way 6186 // it contains any previous declaration. 6187 assert(!S->isDeclScope(PrevDecl)); 6188 if (PrevDecl->isTemplateParameter()) { 6189 // Maybe we will complain about the shadowed template parameter. 6190 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6191 } 6192 } 6193 6194 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6195 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6196 << D.getCXXScopeSpec().getRange(); 6197 Invalid = true; 6198 } 6199 6200 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 6201 D.getIdentifier(), 6202 D.getIdentifierLoc(), 6203 D.getDeclSpec().getSourceRange()); 6204 6205 if (Invalid) 6206 ExDecl->setInvalidDecl(); 6207 6208 // Add the exception declaration into this scope. 6209 if (II) 6210 PushOnScopeChains(ExDecl, S); 6211 else 6212 CurContext->addDecl(ExDecl); 6213 6214 ProcessDeclAttributes(S, ExDecl, D); 6215 return ExDecl; 6216} 6217 6218Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6219 Expr *AssertExpr, 6220 Expr *AssertMessageExpr_) { 6221 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6222 6223 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6224 llvm::APSInt Value(32); 6225 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6226 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6227 AssertExpr->getSourceRange(); 6228 return 0; 6229 } 6230 6231 if (Value == 0) { 6232 Diag(AssertLoc, diag::err_static_assert_failed) 6233 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6234 } 6235 } 6236 6237 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6238 AssertExpr, AssertMessage); 6239 6240 CurContext->addDecl(Decl); 6241 return Decl; 6242} 6243 6244/// \brief Perform semantic analysis of the given friend type declaration. 6245/// 6246/// \returns A friend declaration that. 6247FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6248 TypeSourceInfo *TSInfo) { 6249 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6250 6251 QualType T = TSInfo->getType(); 6252 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6253 6254 if (!getLangOptions().CPlusPlus0x) { 6255 // C++03 [class.friend]p2: 6256 // An elaborated-type-specifier shall be used in a friend declaration 6257 // for a class.* 6258 // 6259 // * The class-key of the elaborated-type-specifier is required. 6260 if (!ActiveTemplateInstantiations.empty()) { 6261 // Do not complain about the form of friend template types during 6262 // template instantiation; we will already have complained when the 6263 // template was declared. 6264 } else if (!T->isElaboratedTypeSpecifier()) { 6265 // If we evaluated the type to a record type, suggest putting 6266 // a tag in front. 6267 if (const RecordType *RT = T->getAs<RecordType>()) { 6268 RecordDecl *RD = RT->getDecl(); 6269 6270 std::string InsertionText = std::string(" ") + RD->getKindName(); 6271 6272 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6273 << (unsigned) RD->getTagKind() 6274 << T 6275 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6276 InsertionText); 6277 } else { 6278 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6279 << T 6280 << SourceRange(FriendLoc, TypeRange.getEnd()); 6281 } 6282 } else if (T->getAs<EnumType>()) { 6283 Diag(FriendLoc, diag::ext_enum_friend) 6284 << T 6285 << SourceRange(FriendLoc, TypeRange.getEnd()); 6286 } 6287 } 6288 6289 // C++0x [class.friend]p3: 6290 // If the type specifier in a friend declaration designates a (possibly 6291 // cv-qualified) class type, that class is declared as a friend; otherwise, 6292 // the friend declaration is ignored. 6293 6294 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6295 // in [class.friend]p3 that we do not implement. 6296 6297 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6298} 6299 6300/// Handle a friend type declaration. This works in tandem with 6301/// ActOnTag. 6302/// 6303/// Notes on friend class templates: 6304/// 6305/// We generally treat friend class declarations as if they were 6306/// declaring a class. So, for example, the elaborated type specifier 6307/// in a friend declaration is required to obey the restrictions of a 6308/// class-head (i.e. no typedefs in the scope chain), template 6309/// parameters are required to match up with simple template-ids, &c. 6310/// However, unlike when declaring a template specialization, it's 6311/// okay to refer to a template specialization without an empty 6312/// template parameter declaration, e.g. 6313/// friend class A<T>::B<unsigned>; 6314/// We permit this as a special case; if there are any template 6315/// parameters present at all, require proper matching, i.e. 6316/// template <> template <class T> friend class A<int>::B; 6317Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6318 MultiTemplateParamsArg TempParams) { 6319 SourceLocation Loc = DS.getSourceRange().getBegin(); 6320 6321 assert(DS.isFriendSpecified()); 6322 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6323 6324 // Try to convert the decl specifier to a type. This works for 6325 // friend templates because ActOnTag never produces a ClassTemplateDecl 6326 // for a TUK_Friend. 6327 Declarator TheDeclarator(DS, Declarator::MemberContext); 6328 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6329 QualType T = TSI->getType(); 6330 if (TheDeclarator.isInvalidType()) 6331 return 0; 6332 6333 // This is definitely an error in C++98. It's probably meant to 6334 // be forbidden in C++0x, too, but the specification is just 6335 // poorly written. 6336 // 6337 // The problem is with declarations like the following: 6338 // template <T> friend A<T>::foo; 6339 // where deciding whether a class C is a friend or not now hinges 6340 // on whether there exists an instantiation of A that causes 6341 // 'foo' to equal C. There are restrictions on class-heads 6342 // (which we declare (by fiat) elaborated friend declarations to 6343 // be) that makes this tractable. 6344 // 6345 // FIXME: handle "template <> friend class A<T>;", which 6346 // is possibly well-formed? Who even knows? 6347 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6348 Diag(Loc, diag::err_tagless_friend_type_template) 6349 << DS.getSourceRange(); 6350 return 0; 6351 } 6352 6353 // C++98 [class.friend]p1: A friend of a class is a function 6354 // or class that is not a member of the class . . . 6355 // This is fixed in DR77, which just barely didn't make the C++03 6356 // deadline. It's also a very silly restriction that seriously 6357 // affects inner classes and which nobody else seems to implement; 6358 // thus we never diagnose it, not even in -pedantic. 6359 // 6360 // But note that we could warn about it: it's always useless to 6361 // friend one of your own members (it's not, however, worthless to 6362 // friend a member of an arbitrary specialization of your template). 6363 6364 Decl *D; 6365 if (unsigned NumTempParamLists = TempParams.size()) 6366 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6367 NumTempParamLists, 6368 (TemplateParameterList**) TempParams.release(), 6369 TSI, 6370 DS.getFriendSpecLoc()); 6371 else 6372 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6373 6374 if (!D) 6375 return 0; 6376 6377 D->setAccess(AS_public); 6378 CurContext->addDecl(D); 6379 6380 return D; 6381} 6382 6383Decl *Sema::ActOnFriendFunctionDecl(Scope *S, 6384 Declarator &D, 6385 bool IsDefinition, 6386 MultiTemplateParamsArg TemplateParams) { 6387 const DeclSpec &DS = D.getDeclSpec(); 6388 6389 assert(DS.isFriendSpecified()); 6390 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6391 6392 SourceLocation Loc = D.getIdentifierLoc(); 6393 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6394 QualType T = TInfo->getType(); 6395 6396 // C++ [class.friend]p1 6397 // A friend of a class is a function or class.... 6398 // Note that this sees through typedefs, which is intended. 6399 // It *doesn't* see through dependent types, which is correct 6400 // according to [temp.arg.type]p3: 6401 // If a declaration acquires a function type through a 6402 // type dependent on a template-parameter and this causes 6403 // a declaration that does not use the syntactic form of a 6404 // function declarator to have a function type, the program 6405 // is ill-formed. 6406 if (!T->isFunctionType()) { 6407 Diag(Loc, diag::err_unexpected_friend); 6408 6409 // It might be worthwhile to try to recover by creating an 6410 // appropriate declaration. 6411 return 0; 6412 } 6413 6414 // C++ [namespace.memdef]p3 6415 // - If a friend declaration in a non-local class first declares a 6416 // class or function, the friend class or function is a member 6417 // of the innermost enclosing namespace. 6418 // - The name of the friend is not found by simple name lookup 6419 // until a matching declaration is provided in that namespace 6420 // scope (either before or after the class declaration granting 6421 // friendship). 6422 // - If a friend function is called, its name may be found by the 6423 // name lookup that considers functions from namespaces and 6424 // classes associated with the types of the function arguments. 6425 // - When looking for a prior declaration of a class or a function 6426 // declared as a friend, scopes outside the innermost enclosing 6427 // namespace scope are not considered. 6428 6429 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 6430 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 6431 DeclarationName Name = NameInfo.getName(); 6432 assert(Name); 6433 6434 // The context we found the declaration in, or in which we should 6435 // create the declaration. 6436 DeclContext *DC; 6437 6438 // FIXME: handle local classes 6439 6440 // Recover from invalid scope qualifiers as if they just weren't there. 6441 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 6442 ForRedeclaration); 6443 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 6444 DC = computeDeclContext(ScopeQual); 6445 6446 // FIXME: handle dependent contexts 6447 if (!DC) return 0; 6448 if (RequireCompleteDeclContext(ScopeQual, DC)) return 0; 6449 6450 LookupQualifiedName(Previous, DC); 6451 6452 // Ignore things found implicitly in the wrong scope. 6453 // TODO: better diagnostics for this case. Suggesting the right 6454 // qualified scope would be nice... 6455 LookupResult::Filter F = Previous.makeFilter(); 6456 while (F.hasNext()) { 6457 NamedDecl *D = F.next(); 6458 if (!D->getDeclContext()->getLookupContext()->Equals(DC)) 6459 F.erase(); 6460 } 6461 F.done(); 6462 6463 if (Previous.empty()) { 6464 D.setInvalidType(); 6465 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6466 return 0; 6467 } 6468 6469 // C++ [class.friend]p1: A friend of a class is a function or 6470 // class that is not a member of the class . . . 6471 if (DC->Equals(CurContext)) 6472 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6473 6474 // Otherwise walk out to the nearest namespace scope looking for matches. 6475 } else { 6476 // TODO: handle local class contexts. 6477 6478 DC = CurContext; 6479 while (true) { 6480 // Skip class contexts. If someone can cite chapter and verse 6481 // for this behavior, that would be nice --- it's what GCC and 6482 // EDG do, and it seems like a reasonable intent, but the spec 6483 // really only says that checks for unqualified existing 6484 // declarations should stop at the nearest enclosing namespace, 6485 // not that they should only consider the nearest enclosing 6486 // namespace. 6487 while (DC->isRecord()) 6488 DC = DC->getParent(); 6489 6490 LookupQualifiedName(Previous, DC); 6491 6492 // TODO: decide what we think about using declarations. 6493 if (!Previous.empty()) 6494 break; 6495 6496 if (DC->isFileContext()) break; 6497 DC = DC->getParent(); 6498 } 6499 6500 // C++ [class.friend]p1: A friend of a class is a function or 6501 // class that is not a member of the class . . . 6502 // C++0x changes this for both friend types and functions. 6503 // Most C++ 98 compilers do seem to give an error here, so 6504 // we do, too. 6505 if (!Previous.empty() && DC->Equals(CurContext) 6506 && !getLangOptions().CPlusPlus0x) 6507 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6508 } 6509 6510 if (DC->isFileContext()) { 6511 // This implies that it has to be an operator or function. 6512 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6513 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6514 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6515 Diag(Loc, diag::err_introducing_special_friend) << 6516 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6517 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6518 return 0; 6519 } 6520 } 6521 6522 bool Redeclaration = false; 6523 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 6524 move(TemplateParams), 6525 IsDefinition, 6526 Redeclaration); 6527 if (!ND) return 0; 6528 6529 assert(ND->getDeclContext() == DC); 6530 assert(ND->getLexicalDeclContext() == CurContext); 6531 6532 // Add the function declaration to the appropriate lookup tables, 6533 // adjusting the redeclarations list as necessary. We don't 6534 // want to do this yet if the friending class is dependent. 6535 // 6536 // Also update the scope-based lookup if the target context's 6537 // lookup context is in lexical scope. 6538 if (!CurContext->isDependentContext()) { 6539 DC = DC->getLookupContext(); 6540 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6541 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6542 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6543 } 6544 6545 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6546 D.getIdentifierLoc(), ND, 6547 DS.getFriendSpecLoc()); 6548 FrD->setAccess(AS_public); 6549 CurContext->addDecl(FrD); 6550 6551 return ND; 6552} 6553 6554void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 6555 AdjustDeclIfTemplate(Dcl); 6556 6557 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6558 if (!Fn) { 6559 Diag(DelLoc, diag::err_deleted_non_function); 6560 return; 6561 } 6562 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6563 Diag(DelLoc, diag::err_deleted_decl_not_first); 6564 Diag(Prev->getLocation(), diag::note_previous_declaration); 6565 // If the declaration wasn't the first, we delete the function anyway for 6566 // recovery. 6567 } 6568 Fn->setDeleted(); 6569} 6570 6571static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6572 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6573 ++CI) { 6574 Stmt *SubStmt = *CI; 6575 if (!SubStmt) 6576 continue; 6577 if (isa<ReturnStmt>(SubStmt)) 6578 Self.Diag(SubStmt->getSourceRange().getBegin(), 6579 diag::err_return_in_constructor_handler); 6580 if (!isa<Expr>(SubStmt)) 6581 SearchForReturnInStmt(Self, SubStmt); 6582 } 6583} 6584 6585void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6586 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6587 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6588 SearchForReturnInStmt(*this, Handler); 6589 } 6590} 6591 6592bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6593 const CXXMethodDecl *Old) { 6594 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6595 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6596 6597 if (Context.hasSameType(NewTy, OldTy) || 6598 NewTy->isDependentType() || OldTy->isDependentType()) 6599 return false; 6600 6601 // Check if the return types are covariant 6602 QualType NewClassTy, OldClassTy; 6603 6604 /// Both types must be pointers or references to classes. 6605 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6606 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6607 NewClassTy = NewPT->getPointeeType(); 6608 OldClassTy = OldPT->getPointeeType(); 6609 } 6610 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6611 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6612 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6613 NewClassTy = NewRT->getPointeeType(); 6614 OldClassTy = OldRT->getPointeeType(); 6615 } 6616 } 6617 } 6618 6619 // The return types aren't either both pointers or references to a class type. 6620 if (NewClassTy.isNull()) { 6621 Diag(New->getLocation(), 6622 diag::err_different_return_type_for_overriding_virtual_function) 6623 << New->getDeclName() << NewTy << OldTy; 6624 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6625 6626 return true; 6627 } 6628 6629 // C++ [class.virtual]p6: 6630 // If the return type of D::f differs from the return type of B::f, the 6631 // class type in the return type of D::f shall be complete at the point of 6632 // declaration of D::f or shall be the class type D. 6633 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6634 if (!RT->isBeingDefined() && 6635 RequireCompleteType(New->getLocation(), NewClassTy, 6636 PDiag(diag::err_covariant_return_incomplete) 6637 << New->getDeclName())) 6638 return true; 6639 } 6640 6641 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6642 // Check if the new class derives from the old class. 6643 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6644 Diag(New->getLocation(), 6645 diag::err_covariant_return_not_derived) 6646 << New->getDeclName() << NewTy << OldTy; 6647 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6648 return true; 6649 } 6650 6651 // Check if we the conversion from derived to base is valid. 6652 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6653 diag::err_covariant_return_inaccessible_base, 6654 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6655 // FIXME: Should this point to the return type? 6656 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6657 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6658 return true; 6659 } 6660 } 6661 6662 // The qualifiers of the return types must be the same. 6663 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6664 Diag(New->getLocation(), 6665 diag::err_covariant_return_type_different_qualifications) 6666 << New->getDeclName() << NewTy << OldTy; 6667 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6668 return true; 6669 }; 6670 6671 6672 // The new class type must have the same or less qualifiers as the old type. 6673 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6674 Diag(New->getLocation(), 6675 diag::err_covariant_return_type_class_type_more_qualified) 6676 << New->getDeclName() << NewTy << OldTy; 6677 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6678 return true; 6679 }; 6680 6681 return false; 6682} 6683 6684bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6685 const CXXMethodDecl *Old) 6686{ 6687 if (Old->hasAttr<FinalAttr>()) { 6688 Diag(New->getLocation(), diag::err_final_function_overridden) 6689 << New->getDeclName(); 6690 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6691 return true; 6692 } 6693 6694 return false; 6695} 6696 6697/// \brief Mark the given method pure. 6698/// 6699/// \param Method the method to be marked pure. 6700/// 6701/// \param InitRange the source range that covers the "0" initializer. 6702bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6703 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6704 Method->setPure(); 6705 6706 // A class is abstract if at least one function is pure virtual. 6707 Method->getParent()->setAbstract(true); 6708 return false; 6709 } 6710 6711 if (!Method->isInvalidDecl()) 6712 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6713 << Method->getDeclName() << InitRange; 6714 return true; 6715} 6716 6717/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6718/// an initializer for the out-of-line declaration 'Dcl'. The scope 6719/// is a fresh scope pushed for just this purpose. 6720/// 6721/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6722/// static data member of class X, names should be looked up in the scope of 6723/// class X. 6724void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 6725 // If there is no declaration, there was an error parsing it. 6726 if (D == 0) return; 6727 6728 // We should only get called for declarations with scope specifiers, like: 6729 // int foo::bar; 6730 assert(D->isOutOfLine()); 6731 EnterDeclaratorContext(S, D->getDeclContext()); 6732} 6733 6734/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6735/// initializer for the out-of-line declaration 'D'. 6736void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 6737 // If there is no declaration, there was an error parsing it. 6738 if (D == 0) return; 6739 6740 assert(D->isOutOfLine()); 6741 ExitDeclaratorContext(S); 6742} 6743 6744/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6745/// C++ if/switch/while/for statement. 6746/// e.g: "if (int x = f()) {...}" 6747DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6748 // C++ 6.4p2: 6749 // The declarator shall not specify a function or an array. 6750 // The type-specifier-seq shall not contain typedef and shall not declare a 6751 // new class or enumeration. 6752 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6753 "Parser allowed 'typedef' as storage class of condition decl."); 6754 6755 TagDecl *OwnedTag = 0; 6756 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6757 QualType Ty = TInfo->getType(); 6758 6759 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6760 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6761 // would be created and CXXConditionDeclExpr wants a VarDecl. 6762 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6763 << D.getSourceRange(); 6764 return DeclResult(); 6765 } else if (OwnedTag && OwnedTag->isDefinition()) { 6766 // The type-specifier-seq shall not declare a new class or enumeration. 6767 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6768 } 6769 6770 Decl *Dcl = ActOnDeclarator(S, D); 6771 if (!Dcl) 6772 return DeclResult(); 6773 6774 return Dcl; 6775} 6776 6777void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6778 bool DefinitionRequired) { 6779 // Ignore any vtable uses in unevaluated operands or for classes that do 6780 // not have a vtable. 6781 if (!Class->isDynamicClass() || Class->isDependentContext() || 6782 CurContext->isDependentContext() || 6783 ExprEvalContexts.back().Context == Unevaluated) 6784 return; 6785 6786 // Try to insert this class into the map. 6787 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6788 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6789 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6790 if (!Pos.second) { 6791 // If we already had an entry, check to see if we are promoting this vtable 6792 // to required a definition. If so, we need to reappend to the VTableUses 6793 // list, since we may have already processed the first entry. 6794 if (DefinitionRequired && !Pos.first->second) { 6795 Pos.first->second = true; 6796 } else { 6797 // Otherwise, we can early exit. 6798 return; 6799 } 6800 } 6801 6802 // Local classes need to have their virtual members marked 6803 // immediately. For all other classes, we mark their virtual members 6804 // at the end of the translation unit. 6805 if (Class->isLocalClass()) 6806 MarkVirtualMembersReferenced(Loc, Class); 6807 else 6808 VTableUses.push_back(std::make_pair(Class, Loc)); 6809} 6810 6811bool Sema::DefineUsedVTables() { 6812 // If any dynamic classes have their key function defined within 6813 // this translation unit, then those vtables are considered "used" and must 6814 // be emitted. 6815 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6816 if (const CXXMethodDecl *KeyFunction 6817 = Context.getKeyFunction(DynamicClasses[I])) { 6818 const FunctionDecl *Definition = 0; 6819 if (KeyFunction->hasBody(Definition)) 6820 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6821 } 6822 } 6823 6824 if (VTableUses.empty()) 6825 return false; 6826 6827 // Note: The VTableUses vector could grow as a result of marking 6828 // the members of a class as "used", so we check the size each 6829 // time through the loop and prefer indices (with are stable) to 6830 // iterators (which are not). 6831 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6832 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6833 if (!Class) 6834 continue; 6835 6836 SourceLocation Loc = VTableUses[I].second; 6837 6838 // If this class has a key function, but that key function is 6839 // defined in another translation unit, we don't need to emit the 6840 // vtable even though we're using it. 6841 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6842 if (KeyFunction && !KeyFunction->hasBody()) { 6843 switch (KeyFunction->getTemplateSpecializationKind()) { 6844 case TSK_Undeclared: 6845 case TSK_ExplicitSpecialization: 6846 case TSK_ExplicitInstantiationDeclaration: 6847 // The key function is in another translation unit. 6848 continue; 6849 6850 case TSK_ExplicitInstantiationDefinition: 6851 case TSK_ImplicitInstantiation: 6852 // We will be instantiating the key function. 6853 break; 6854 } 6855 } else if (!KeyFunction) { 6856 // If we have a class with no key function that is the subject 6857 // of an explicit instantiation declaration, suppress the 6858 // vtable; it will live with the explicit instantiation 6859 // definition. 6860 bool IsExplicitInstantiationDeclaration 6861 = Class->getTemplateSpecializationKind() 6862 == TSK_ExplicitInstantiationDeclaration; 6863 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6864 REnd = Class->redecls_end(); 6865 R != REnd; ++R) { 6866 TemplateSpecializationKind TSK 6867 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6868 if (TSK == TSK_ExplicitInstantiationDeclaration) 6869 IsExplicitInstantiationDeclaration = true; 6870 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6871 IsExplicitInstantiationDeclaration = false; 6872 break; 6873 } 6874 } 6875 6876 if (IsExplicitInstantiationDeclaration) 6877 continue; 6878 } 6879 6880 // Mark all of the virtual members of this class as referenced, so 6881 // that we can build a vtable. Then, tell the AST consumer that a 6882 // vtable for this class is required. 6883 MarkVirtualMembersReferenced(Loc, Class); 6884 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6885 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6886 6887 // Optionally warn if we're emitting a weak vtable. 6888 if (Class->getLinkage() == ExternalLinkage && 6889 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6890 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 6891 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6892 } 6893 } 6894 VTableUses.clear(); 6895 6896 return true; 6897} 6898 6899void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6900 const CXXRecordDecl *RD) { 6901 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6902 e = RD->method_end(); i != e; ++i) { 6903 CXXMethodDecl *MD = *i; 6904 6905 // C++ [basic.def.odr]p2: 6906 // [...] A virtual member function is used if it is not pure. [...] 6907 if (MD->isVirtual() && !MD->isPure()) 6908 MarkDeclarationReferenced(Loc, MD); 6909 } 6910 6911 // Only classes that have virtual bases need a VTT. 6912 if (RD->getNumVBases() == 0) 6913 return; 6914 6915 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6916 e = RD->bases_end(); i != e; ++i) { 6917 const CXXRecordDecl *Base = 6918 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6919 if (Base->getNumVBases() == 0) 6920 continue; 6921 MarkVirtualMembersReferenced(Loc, Base); 6922 } 6923} 6924 6925/// SetIvarInitializers - This routine builds initialization ASTs for the 6926/// Objective-C implementation whose ivars need be initialized. 6927void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6928 if (!getLangOptions().CPlusPlus) 6929 return; 6930 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6931 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6932 CollectIvarsToConstructOrDestruct(OID, ivars); 6933 if (ivars.empty()) 6934 return; 6935 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6936 for (unsigned i = 0; i < ivars.size(); i++) { 6937 FieldDecl *Field = ivars[i]; 6938 if (Field->isInvalidDecl()) 6939 continue; 6940 6941 CXXBaseOrMemberInitializer *Member; 6942 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6943 InitializationKind InitKind = 6944 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6945 6946 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6947 ExprResult MemberInit = 6948 InitSeq.Perform(*this, InitEntity, InitKind, 6949 Sema::MultiExprArg(*this, 0, 0)); 6950 MemberInit = MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 6951 // Note, MemberInit could actually come back empty if no initialization 6952 // is required (e.g., because it would call a trivial default constructor) 6953 if (!MemberInit.get() || MemberInit.isInvalid()) 6954 continue; 6955 6956 Member = 6957 new (Context) CXXBaseOrMemberInitializer(Context, 6958 Field, SourceLocation(), 6959 SourceLocation(), 6960 MemberInit.takeAs<Expr>(), 6961 SourceLocation()); 6962 AllToInit.push_back(Member); 6963 6964 // Be sure that the destructor is accessible and is marked as referenced. 6965 if (const RecordType *RecordTy 6966 = Context.getBaseElementType(Field->getType()) 6967 ->getAs<RecordType>()) { 6968 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6969 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 6970 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6971 CheckDestructorAccess(Field->getLocation(), Destructor, 6972 PDiag(diag::err_access_dtor_ivar) 6973 << Context.getBaseElementType(Field->getType())); 6974 } 6975 } 6976 } 6977 ObjCImplementation->setIvarInitializers(Context, 6978 AllToInit.data(), AllToInit.size()); 6979 } 6980} 6981