SemaDeclCXX.cpp revision 4e4d57069cf9402728e05f7fc856295a86e4801f
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/CharUnits.h" 22#include "clang/AST/CXXInheritance.h" 23#include "clang/AST/DeclVisitor.h" 24#include "clang/AST/RecordLayout.h" 25#include "clang/AST/StmtVisitor.h" 26#include "clang/AST/TypeLoc.h" 27#include "clang/AST/TypeOrdering.h" 28#include "clang/Sema/DeclSpec.h" 29#include "clang/Sema/ParsedTemplate.h" 30#include "clang/Basic/PartialDiagnostic.h" 31#include "clang/Lex/Preprocessor.h" 32#include "llvm/ADT/DenseSet.h" 33#include "llvm/ADT/STLExtras.h" 34#include <map> 35#include <set> 36 37using namespace clang; 38 39//===----------------------------------------------------------------------===// 40// CheckDefaultArgumentVisitor 41//===----------------------------------------------------------------------===// 42 43namespace { 44 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 45 /// the default argument of a parameter to determine whether it 46 /// contains any ill-formed subexpressions. For example, this will 47 /// diagnose the use of local variables or parameters within the 48 /// default argument expression. 49 class CheckDefaultArgumentVisitor 50 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 51 Expr *DefaultArg; 52 Sema *S; 53 54 public: 55 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 56 : DefaultArg(defarg), S(s) {} 57 58 bool VisitExpr(Expr *Node); 59 bool VisitDeclRefExpr(DeclRefExpr *DRE); 60 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 61 }; 62 63 /// VisitExpr - Visit all of the children of this expression. 64 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 65 bool IsInvalid = false; 66 for (Stmt::child_iterator I = Node->child_begin(), 67 E = Node->child_end(); I != E; ++I) 68 IsInvalid |= Visit(*I); 69 return IsInvalid; 70 } 71 72 /// VisitDeclRefExpr - Visit a reference to a declaration, to 73 /// determine whether this declaration can be used in the default 74 /// argument expression. 75 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 76 NamedDecl *Decl = DRE->getDecl(); 77 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 78 // C++ [dcl.fct.default]p9 79 // Default arguments are evaluated each time the function is 80 // called. The order of evaluation of function arguments is 81 // unspecified. Consequently, parameters of a function shall not 82 // be used in default argument expressions, even if they are not 83 // evaluated. Parameters of a function declared before a default 84 // argument expression are in scope and can hide namespace and 85 // class member names. 86 return S->Diag(DRE->getSourceRange().getBegin(), 87 diag::err_param_default_argument_references_param) 88 << Param->getDeclName() << DefaultArg->getSourceRange(); 89 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 90 // C++ [dcl.fct.default]p7 91 // Local variables shall not be used in default argument 92 // expressions. 93 if (VDecl->isBlockVarDecl()) 94 return S->Diag(DRE->getSourceRange().getBegin(), 95 diag::err_param_default_argument_references_local) 96 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 97 } 98 99 return false; 100 } 101 102 /// VisitCXXThisExpr - Visit a C++ "this" expression. 103 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 104 // C++ [dcl.fct.default]p8: 105 // The keyword this shall not be used in a default argument of a 106 // member function. 107 return S->Diag(ThisE->getSourceRange().getBegin(), 108 diag::err_param_default_argument_references_this) 109 << ThisE->getSourceRange(); 110 } 111} 112 113bool 114Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 115 SourceLocation EqualLoc) { 116 if (RequireCompleteType(Param->getLocation(), Param->getType(), 117 diag::err_typecheck_decl_incomplete_type)) { 118 Param->setInvalidDecl(); 119 return true; 120 } 121 122 // C++ [dcl.fct.default]p5 123 // A default argument expression is implicitly converted (clause 124 // 4) to the parameter type. The default argument expression has 125 // the same semantic constraints as the initializer expression in 126 // a declaration of a variable of the parameter type, using the 127 // copy-initialization semantics (8.5). 128 InitializedEntity Entity = InitializedEntity::InitializeParameter(Param); 129 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 130 EqualLoc); 131 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 132 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 133 MultiExprArg(*this, &Arg, 1)); 134 if (Result.isInvalid()) 135 return true; 136 Arg = Result.takeAs<Expr>(); 137 138 Arg = MaybeCreateCXXExprWithTemporaries(Arg); 139 140 // Okay: add the default argument to the parameter 141 Param->setDefaultArg(Arg); 142 143 return false; 144} 145 146/// ActOnParamDefaultArgument - Check whether the default argument 147/// provided for a function parameter is well-formed. If so, attach it 148/// to the parameter declaration. 149void 150Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 151 Expr *DefaultArg) { 152 if (!param || !DefaultArg) 153 return; 154 155 ParmVarDecl *Param = cast<ParmVarDecl>(param); 156 UnparsedDefaultArgLocs.erase(Param); 157 158 // Default arguments are only permitted in C++ 159 if (!getLangOptions().CPlusPlus) { 160 Diag(EqualLoc, diag::err_param_default_argument) 161 << DefaultArg->getSourceRange(); 162 Param->setInvalidDecl(); 163 return; 164 } 165 166 // Check that the default argument is well-formed 167 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 168 if (DefaultArgChecker.Visit(DefaultArg)) { 169 Param->setInvalidDecl(); 170 return; 171 } 172 173 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 174} 175 176/// ActOnParamUnparsedDefaultArgument - We've seen a default 177/// argument for a function parameter, but we can't parse it yet 178/// because we're inside a class definition. Note that this default 179/// argument will be parsed later. 180void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 181 SourceLocation EqualLoc, 182 SourceLocation ArgLoc) { 183 if (!param) 184 return; 185 186 ParmVarDecl *Param = cast<ParmVarDecl>(param); 187 if (Param) 188 Param->setUnparsedDefaultArg(); 189 190 UnparsedDefaultArgLocs[Param] = ArgLoc; 191} 192 193/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 194/// the default argument for the parameter param failed. 195void Sema::ActOnParamDefaultArgumentError(Decl *param) { 196 if (!param) 197 return; 198 199 ParmVarDecl *Param = cast<ParmVarDecl>(param); 200 201 Param->setInvalidDecl(); 202 203 UnparsedDefaultArgLocs.erase(Param); 204} 205 206/// CheckExtraCXXDefaultArguments - Check for any extra default 207/// arguments in the declarator, which is not a function declaration 208/// or definition and therefore is not permitted to have default 209/// arguments. This routine should be invoked for every declarator 210/// that is not a function declaration or definition. 211void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 212 // C++ [dcl.fct.default]p3 213 // A default argument expression shall be specified only in the 214 // parameter-declaration-clause of a function declaration or in a 215 // template-parameter (14.1). It shall not be specified for a 216 // parameter pack. If it is specified in a 217 // parameter-declaration-clause, it shall not occur within a 218 // declarator or abstract-declarator of a parameter-declaration. 219 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 220 DeclaratorChunk &chunk = D.getTypeObject(i); 221 if (chunk.Kind == DeclaratorChunk::Function) { 222 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 223 ParmVarDecl *Param = 224 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 225 if (Param->hasUnparsedDefaultArg()) { 226 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 227 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 228 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 229 delete Toks; 230 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 231 } else if (Param->getDefaultArg()) { 232 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 233 << Param->getDefaultArg()->getSourceRange(); 234 Param->setDefaultArg(0); 235 } 236 } 237 } 238 } 239} 240 241// MergeCXXFunctionDecl - Merge two declarations of the same C++ 242// function, once we already know that they have the same 243// type. Subroutine of MergeFunctionDecl. Returns true if there was an 244// error, false otherwise. 245bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 246 bool Invalid = false; 247 248 // C++ [dcl.fct.default]p4: 249 // For non-template functions, default arguments can be added in 250 // later declarations of a function in the same 251 // scope. Declarations in different scopes have completely 252 // distinct sets of default arguments. That is, declarations in 253 // inner scopes do not acquire default arguments from 254 // declarations in outer scopes, and vice versa. In a given 255 // function declaration, all parameters subsequent to a 256 // parameter with a default argument shall have default 257 // arguments supplied in this or previous declarations. A 258 // default argument shall not be redefined by a later 259 // declaration (not even to the same value). 260 // 261 // C++ [dcl.fct.default]p6: 262 // Except for member functions of class templates, the default arguments 263 // in a member function definition that appears outside of the class 264 // definition are added to the set of default arguments provided by the 265 // member function declaration in the class definition. 266 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 267 ParmVarDecl *OldParam = Old->getParamDecl(p); 268 ParmVarDecl *NewParam = New->getParamDecl(p); 269 270 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 271 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 272 // hint here. Alternatively, we could walk the type-source information 273 // for NewParam to find the last source location in the type... but it 274 // isn't worth the effort right now. This is the kind of test case that 275 // is hard to get right: 276 277 // int f(int); 278 // void g(int (*fp)(int) = f); 279 // void g(int (*fp)(int) = &f); 280 Diag(NewParam->getLocation(), 281 diag::err_param_default_argument_redefinition) 282 << NewParam->getDefaultArgRange(); 283 284 // Look for the function declaration where the default argument was 285 // actually written, which may be a declaration prior to Old. 286 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 287 Older; Older = Older->getPreviousDeclaration()) { 288 if (!Older->getParamDecl(p)->hasDefaultArg()) 289 break; 290 291 OldParam = Older->getParamDecl(p); 292 } 293 294 Diag(OldParam->getLocation(), diag::note_previous_definition) 295 << OldParam->getDefaultArgRange(); 296 Invalid = true; 297 } else if (OldParam->hasDefaultArg()) { 298 // Merge the old default argument into the new parameter. 299 // It's important to use getInit() here; getDefaultArg() 300 // strips off any top-level CXXExprWithTemporaries. 301 NewParam->setHasInheritedDefaultArg(); 302 if (OldParam->hasUninstantiatedDefaultArg()) 303 NewParam->setUninstantiatedDefaultArg( 304 OldParam->getUninstantiatedDefaultArg()); 305 else 306 NewParam->setDefaultArg(OldParam->getInit()); 307 } else if (NewParam->hasDefaultArg()) { 308 if (New->getDescribedFunctionTemplate()) { 309 // Paragraph 4, quoted above, only applies to non-template functions. 310 Diag(NewParam->getLocation(), 311 diag::err_param_default_argument_template_redecl) 312 << NewParam->getDefaultArgRange(); 313 Diag(Old->getLocation(), diag::note_template_prev_declaration) 314 << false; 315 } else if (New->getTemplateSpecializationKind() 316 != TSK_ImplicitInstantiation && 317 New->getTemplateSpecializationKind() != TSK_Undeclared) { 318 // C++ [temp.expr.spec]p21: 319 // Default function arguments shall not be specified in a declaration 320 // or a definition for one of the following explicit specializations: 321 // - the explicit specialization of a function template; 322 // - the explicit specialization of a member function template; 323 // - the explicit specialization of a member function of a class 324 // template where the class template specialization to which the 325 // member function specialization belongs is implicitly 326 // instantiated. 327 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 328 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 329 << New->getDeclName() 330 << NewParam->getDefaultArgRange(); 331 } else if (New->getDeclContext()->isDependentContext()) { 332 // C++ [dcl.fct.default]p6 (DR217): 333 // Default arguments for a member function of a class template shall 334 // be specified on the initial declaration of the member function 335 // within the class template. 336 // 337 // Reading the tea leaves a bit in DR217 and its reference to DR205 338 // leads me to the conclusion that one cannot add default function 339 // arguments for an out-of-line definition of a member function of a 340 // dependent type. 341 int WhichKind = 2; 342 if (CXXRecordDecl *Record 343 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 344 if (Record->getDescribedClassTemplate()) 345 WhichKind = 0; 346 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 347 WhichKind = 1; 348 else 349 WhichKind = 2; 350 } 351 352 Diag(NewParam->getLocation(), 353 diag::err_param_default_argument_member_template_redecl) 354 << WhichKind 355 << NewParam->getDefaultArgRange(); 356 } 357 } 358 } 359 360 if (CheckEquivalentExceptionSpec(Old, New)) 361 Invalid = true; 362 363 return Invalid; 364} 365 366/// CheckCXXDefaultArguments - Verify that the default arguments for a 367/// function declaration are well-formed according to C++ 368/// [dcl.fct.default]. 369void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 370 unsigned NumParams = FD->getNumParams(); 371 unsigned p; 372 373 // Find first parameter with a default argument 374 for (p = 0; p < NumParams; ++p) { 375 ParmVarDecl *Param = FD->getParamDecl(p); 376 if (Param->hasDefaultArg()) 377 break; 378 } 379 380 // C++ [dcl.fct.default]p4: 381 // In a given function declaration, all parameters 382 // subsequent to a parameter with a default argument shall 383 // have default arguments supplied in this or previous 384 // declarations. A default argument shall not be redefined 385 // by a later declaration (not even to the same value). 386 unsigned LastMissingDefaultArg = 0; 387 for (; p < NumParams; ++p) { 388 ParmVarDecl *Param = FD->getParamDecl(p); 389 if (!Param->hasDefaultArg()) { 390 if (Param->isInvalidDecl()) 391 /* We already complained about this parameter. */; 392 else if (Param->getIdentifier()) 393 Diag(Param->getLocation(), 394 diag::err_param_default_argument_missing_name) 395 << Param->getIdentifier(); 396 else 397 Diag(Param->getLocation(), 398 diag::err_param_default_argument_missing); 399 400 LastMissingDefaultArg = p; 401 } 402 } 403 404 if (LastMissingDefaultArg > 0) { 405 // Some default arguments were missing. Clear out all of the 406 // default arguments up to (and including) the last missing 407 // default argument, so that we leave the function parameters 408 // in a semantically valid state. 409 for (p = 0; p <= LastMissingDefaultArg; ++p) { 410 ParmVarDecl *Param = FD->getParamDecl(p); 411 if (Param->hasDefaultArg()) { 412 Param->setDefaultArg(0); 413 } 414 } 415 } 416} 417 418/// isCurrentClassName - Determine whether the identifier II is the 419/// name of the class type currently being defined. In the case of 420/// nested classes, this will only return true if II is the name of 421/// the innermost class. 422bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 423 const CXXScopeSpec *SS) { 424 assert(getLangOptions().CPlusPlus && "No class names in C!"); 425 426 CXXRecordDecl *CurDecl; 427 if (SS && SS->isSet() && !SS->isInvalid()) { 428 DeclContext *DC = computeDeclContext(*SS, true); 429 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 430 } else 431 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 432 433 if (CurDecl && CurDecl->getIdentifier()) 434 return &II == CurDecl->getIdentifier(); 435 else 436 return false; 437} 438 439/// \brief Check the validity of a C++ base class specifier. 440/// 441/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 442/// and returns NULL otherwise. 443CXXBaseSpecifier * 444Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 445 SourceRange SpecifierRange, 446 bool Virtual, AccessSpecifier Access, 447 TypeSourceInfo *TInfo) { 448 QualType BaseType = TInfo->getType(); 449 450 // C++ [class.union]p1: 451 // A union shall not have base classes. 452 if (Class->isUnion()) { 453 Diag(Class->getLocation(), diag::err_base_clause_on_union) 454 << SpecifierRange; 455 return 0; 456 } 457 458 if (BaseType->isDependentType()) 459 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 460 Class->getTagKind() == TTK_Class, 461 Access, TInfo); 462 463 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 464 465 // Base specifiers must be record types. 466 if (!BaseType->isRecordType()) { 467 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 468 return 0; 469 } 470 471 // C++ [class.union]p1: 472 // A union shall not be used as a base class. 473 if (BaseType->isUnionType()) { 474 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 475 return 0; 476 } 477 478 // C++ [class.derived]p2: 479 // The class-name in a base-specifier shall not be an incompletely 480 // defined class. 481 if (RequireCompleteType(BaseLoc, BaseType, 482 PDiag(diag::err_incomplete_base_class) 483 << SpecifierRange)) { 484 Class->setInvalidDecl(); 485 return 0; 486 } 487 488 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 489 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 490 assert(BaseDecl && "Record type has no declaration"); 491 BaseDecl = BaseDecl->getDefinition(); 492 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 493 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 494 assert(CXXBaseDecl && "Base type is not a C++ type"); 495 496 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 497 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 498 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 499 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 500 << BaseType; 501 return 0; 502 } 503 504 SetClassDeclAttributesFromBase(Class, CXXBaseDecl, Virtual); 505 506 if (BaseDecl->isInvalidDecl()) 507 Class->setInvalidDecl(); 508 509 // Create the base specifier. 510 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 511 Class->getTagKind() == TTK_Class, 512 Access, TInfo); 513} 514 515void Sema::SetClassDeclAttributesFromBase(CXXRecordDecl *Class, 516 const CXXRecordDecl *BaseClass, 517 bool BaseIsVirtual) { 518 // A class with a non-empty base class is not empty. 519 // FIXME: Standard ref? 520 if (!BaseClass->isEmpty()) 521 Class->setEmpty(false); 522 523 // C++ [class.virtual]p1: 524 // A class that [...] inherits a virtual function is called a polymorphic 525 // class. 526 if (BaseClass->isPolymorphic()) 527 Class->setPolymorphic(true); 528 529 // C++ [dcl.init.aggr]p1: 530 // An aggregate is [...] a class with [...] no base classes [...]. 531 Class->setAggregate(false); 532 533 // C++ [class]p4: 534 // A POD-struct is an aggregate class... 535 Class->setPOD(false); 536 537 if (BaseIsVirtual) { 538 // C++ [class.ctor]p5: 539 // A constructor is trivial if its class has no virtual base classes. 540 Class->setHasTrivialConstructor(false); 541 542 // C++ [class.copy]p6: 543 // A copy constructor is trivial if its class has no virtual base classes. 544 Class->setHasTrivialCopyConstructor(false); 545 546 // C++ [class.copy]p11: 547 // A copy assignment operator is trivial if its class has no virtual 548 // base classes. 549 Class->setHasTrivialCopyAssignment(false); 550 551 // C++0x [meta.unary.prop] is_empty: 552 // T is a class type, but not a union type, with ... no virtual base 553 // classes 554 Class->setEmpty(false); 555 } else { 556 // C++ [class.ctor]p5: 557 // A constructor is trivial if all the direct base classes of its 558 // class have trivial constructors. 559 if (!BaseClass->hasTrivialConstructor()) 560 Class->setHasTrivialConstructor(false); 561 562 // C++ [class.copy]p6: 563 // A copy constructor is trivial if all the direct base classes of its 564 // class have trivial copy constructors. 565 if (!BaseClass->hasTrivialCopyConstructor()) 566 Class->setHasTrivialCopyConstructor(false); 567 568 // C++ [class.copy]p11: 569 // A copy assignment operator is trivial if all the direct base classes 570 // of its class have trivial copy assignment operators. 571 if (!BaseClass->hasTrivialCopyAssignment()) 572 Class->setHasTrivialCopyAssignment(false); 573 } 574 575 // C++ [class.ctor]p3: 576 // A destructor is trivial if all the direct base classes of its class 577 // have trivial destructors. 578 if (!BaseClass->hasTrivialDestructor()) 579 Class->setHasTrivialDestructor(false); 580} 581 582/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 583/// one entry in the base class list of a class specifier, for 584/// example: 585/// class foo : public bar, virtual private baz { 586/// 'public bar' and 'virtual private baz' are each base-specifiers. 587BaseResult 588Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 589 bool Virtual, AccessSpecifier Access, 590 ParsedType basetype, SourceLocation BaseLoc) { 591 if (!classdecl) 592 return true; 593 594 AdjustDeclIfTemplate(classdecl); 595 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 596 if (!Class) 597 return true; 598 599 TypeSourceInfo *TInfo = 0; 600 GetTypeFromParser(basetype, &TInfo); 601 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 602 Virtual, Access, TInfo)) 603 return BaseSpec; 604 605 return true; 606} 607 608/// \brief Performs the actual work of attaching the given base class 609/// specifiers to a C++ class. 610bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 611 unsigned NumBases) { 612 if (NumBases == 0) 613 return false; 614 615 // Used to keep track of which base types we have already seen, so 616 // that we can properly diagnose redundant direct base types. Note 617 // that the key is always the unqualified canonical type of the base 618 // class. 619 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 620 621 // Copy non-redundant base specifiers into permanent storage. 622 unsigned NumGoodBases = 0; 623 bool Invalid = false; 624 for (unsigned idx = 0; idx < NumBases; ++idx) { 625 QualType NewBaseType 626 = Context.getCanonicalType(Bases[idx]->getType()); 627 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 628 if (!Class->hasObjectMember()) { 629 if (const RecordType *FDTTy = 630 NewBaseType.getTypePtr()->getAs<RecordType>()) 631 if (FDTTy->getDecl()->hasObjectMember()) 632 Class->setHasObjectMember(true); 633 } 634 635 if (KnownBaseTypes[NewBaseType]) { 636 // C++ [class.mi]p3: 637 // A class shall not be specified as a direct base class of a 638 // derived class more than once. 639 Diag(Bases[idx]->getSourceRange().getBegin(), 640 diag::err_duplicate_base_class) 641 << KnownBaseTypes[NewBaseType]->getType() 642 << Bases[idx]->getSourceRange(); 643 644 // Delete the duplicate base class specifier; we're going to 645 // overwrite its pointer later. 646 Context.Deallocate(Bases[idx]); 647 648 Invalid = true; 649 } else { 650 // Okay, add this new base class. 651 KnownBaseTypes[NewBaseType] = Bases[idx]; 652 Bases[NumGoodBases++] = Bases[idx]; 653 } 654 } 655 656 // Attach the remaining base class specifiers to the derived class. 657 Class->setBases(Bases, NumGoodBases); 658 659 // Delete the remaining (good) base class specifiers, since their 660 // data has been copied into the CXXRecordDecl. 661 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 662 Context.Deallocate(Bases[idx]); 663 664 return Invalid; 665} 666 667/// ActOnBaseSpecifiers - Attach the given base specifiers to the 668/// class, after checking whether there are any duplicate base 669/// classes. 670void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 671 unsigned NumBases) { 672 if (!ClassDecl || !Bases || !NumBases) 673 return; 674 675 AdjustDeclIfTemplate(ClassDecl); 676 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 677 (CXXBaseSpecifier**)(Bases), NumBases); 678} 679 680static CXXRecordDecl *GetClassForType(QualType T) { 681 if (const RecordType *RT = T->getAs<RecordType>()) 682 return cast<CXXRecordDecl>(RT->getDecl()); 683 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 684 return ICT->getDecl(); 685 else 686 return 0; 687} 688 689/// \brief Determine whether the type \p Derived is a C++ class that is 690/// derived from the type \p Base. 691bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 692 if (!getLangOptions().CPlusPlus) 693 return false; 694 695 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 696 if (!DerivedRD) 697 return false; 698 699 CXXRecordDecl *BaseRD = GetClassForType(Base); 700 if (!BaseRD) 701 return false; 702 703 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 704 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 705} 706 707/// \brief Determine whether the type \p Derived is a C++ class that is 708/// derived from the type \p Base. 709bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 710 if (!getLangOptions().CPlusPlus) 711 return false; 712 713 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 714 if (!DerivedRD) 715 return false; 716 717 CXXRecordDecl *BaseRD = GetClassForType(Base); 718 if (!BaseRD) 719 return false; 720 721 return DerivedRD->isDerivedFrom(BaseRD, Paths); 722} 723 724void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 725 CXXCastPath &BasePathArray) { 726 assert(BasePathArray.empty() && "Base path array must be empty!"); 727 assert(Paths.isRecordingPaths() && "Must record paths!"); 728 729 const CXXBasePath &Path = Paths.front(); 730 731 // We first go backward and check if we have a virtual base. 732 // FIXME: It would be better if CXXBasePath had the base specifier for 733 // the nearest virtual base. 734 unsigned Start = 0; 735 for (unsigned I = Path.size(); I != 0; --I) { 736 if (Path[I - 1].Base->isVirtual()) { 737 Start = I - 1; 738 break; 739 } 740 } 741 742 // Now add all bases. 743 for (unsigned I = Start, E = Path.size(); I != E; ++I) 744 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 745} 746 747/// \brief Determine whether the given base path includes a virtual 748/// base class. 749bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 750 for (CXXCastPath::const_iterator B = BasePath.begin(), 751 BEnd = BasePath.end(); 752 B != BEnd; ++B) 753 if ((*B)->isVirtual()) 754 return true; 755 756 return false; 757} 758 759/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 760/// conversion (where Derived and Base are class types) is 761/// well-formed, meaning that the conversion is unambiguous (and 762/// that all of the base classes are accessible). Returns true 763/// and emits a diagnostic if the code is ill-formed, returns false 764/// otherwise. Loc is the location where this routine should point to 765/// if there is an error, and Range is the source range to highlight 766/// if there is an error. 767bool 768Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 769 unsigned InaccessibleBaseID, 770 unsigned AmbigiousBaseConvID, 771 SourceLocation Loc, SourceRange Range, 772 DeclarationName Name, 773 CXXCastPath *BasePath) { 774 // First, determine whether the path from Derived to Base is 775 // ambiguous. This is slightly more expensive than checking whether 776 // the Derived to Base conversion exists, because here we need to 777 // explore multiple paths to determine if there is an ambiguity. 778 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 779 /*DetectVirtual=*/false); 780 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 781 assert(DerivationOkay && 782 "Can only be used with a derived-to-base conversion"); 783 (void)DerivationOkay; 784 785 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 786 if (InaccessibleBaseID) { 787 // Check that the base class can be accessed. 788 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 789 InaccessibleBaseID)) { 790 case AR_inaccessible: 791 return true; 792 case AR_accessible: 793 case AR_dependent: 794 case AR_delayed: 795 break; 796 } 797 } 798 799 // Build a base path if necessary. 800 if (BasePath) 801 BuildBasePathArray(Paths, *BasePath); 802 return false; 803 } 804 805 // We know that the derived-to-base conversion is ambiguous, and 806 // we're going to produce a diagnostic. Perform the derived-to-base 807 // search just one more time to compute all of the possible paths so 808 // that we can print them out. This is more expensive than any of 809 // the previous derived-to-base checks we've done, but at this point 810 // performance isn't as much of an issue. 811 Paths.clear(); 812 Paths.setRecordingPaths(true); 813 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 814 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 815 (void)StillOkay; 816 817 // Build up a textual representation of the ambiguous paths, e.g., 818 // D -> B -> A, that will be used to illustrate the ambiguous 819 // conversions in the diagnostic. We only print one of the paths 820 // to each base class subobject. 821 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 822 823 Diag(Loc, AmbigiousBaseConvID) 824 << Derived << Base << PathDisplayStr << Range << Name; 825 return true; 826} 827 828bool 829Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 830 SourceLocation Loc, SourceRange Range, 831 CXXCastPath *BasePath, 832 bool IgnoreAccess) { 833 return CheckDerivedToBaseConversion(Derived, Base, 834 IgnoreAccess ? 0 835 : diag::err_upcast_to_inaccessible_base, 836 diag::err_ambiguous_derived_to_base_conv, 837 Loc, Range, DeclarationName(), 838 BasePath); 839} 840 841 842/// @brief Builds a string representing ambiguous paths from a 843/// specific derived class to different subobjects of the same base 844/// class. 845/// 846/// This function builds a string that can be used in error messages 847/// to show the different paths that one can take through the 848/// inheritance hierarchy to go from the derived class to different 849/// subobjects of a base class. The result looks something like this: 850/// @code 851/// struct D -> struct B -> struct A 852/// struct D -> struct C -> struct A 853/// @endcode 854std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 855 std::string PathDisplayStr; 856 std::set<unsigned> DisplayedPaths; 857 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 858 Path != Paths.end(); ++Path) { 859 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 860 // We haven't displayed a path to this particular base 861 // class subobject yet. 862 PathDisplayStr += "\n "; 863 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 864 for (CXXBasePath::const_iterator Element = Path->begin(); 865 Element != Path->end(); ++Element) 866 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 867 } 868 } 869 870 return PathDisplayStr; 871} 872 873//===----------------------------------------------------------------------===// 874// C++ class member Handling 875//===----------------------------------------------------------------------===// 876 877/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 878Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 879 SourceLocation ASLoc, 880 SourceLocation ColonLoc) { 881 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 882 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 883 ASLoc, ColonLoc); 884 CurContext->addHiddenDecl(ASDecl); 885 return ASDecl; 886} 887 888/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 889/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 890/// bitfield width if there is one and 'InitExpr' specifies the initializer if 891/// any. 892Decl * 893Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 894 MultiTemplateParamsArg TemplateParameterLists, 895 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 896 bool Deleted) { 897 const DeclSpec &DS = D.getDeclSpec(); 898 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 899 DeclarationName Name = NameInfo.getName(); 900 SourceLocation Loc = NameInfo.getLoc(); 901 Expr *BitWidth = static_cast<Expr*>(BW); 902 Expr *Init = static_cast<Expr*>(InitExpr); 903 904 assert(isa<CXXRecordDecl>(CurContext)); 905 assert(!DS.isFriendSpecified()); 906 907 bool isFunc = false; 908 if (D.isFunctionDeclarator()) 909 isFunc = true; 910 else if (D.getNumTypeObjects() == 0 && 911 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 912 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 913 isFunc = TDType->isFunctionType(); 914 } 915 916 // C++ 9.2p6: A member shall not be declared to have automatic storage 917 // duration (auto, register) or with the extern storage-class-specifier. 918 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 919 // data members and cannot be applied to names declared const or static, 920 // and cannot be applied to reference members. 921 switch (DS.getStorageClassSpec()) { 922 case DeclSpec::SCS_unspecified: 923 case DeclSpec::SCS_typedef: 924 case DeclSpec::SCS_static: 925 // FALL THROUGH. 926 break; 927 case DeclSpec::SCS_mutable: 928 if (isFunc) { 929 if (DS.getStorageClassSpecLoc().isValid()) 930 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 931 else 932 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 933 934 // FIXME: It would be nicer if the keyword was ignored only for this 935 // declarator. Otherwise we could get follow-up errors. 936 D.getMutableDeclSpec().ClearStorageClassSpecs(); 937 } 938 break; 939 default: 940 if (DS.getStorageClassSpecLoc().isValid()) 941 Diag(DS.getStorageClassSpecLoc(), 942 diag::err_storageclass_invalid_for_member); 943 else 944 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 945 D.getMutableDeclSpec().ClearStorageClassSpecs(); 946 } 947 948 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 949 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 950 !isFunc); 951 952 Decl *Member; 953 if (isInstField) { 954 // FIXME: Check for template parameters! 955 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 956 AS); 957 assert(Member && "HandleField never returns null"); 958 } else { 959 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 960 if (!Member) { 961 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. 1059MemInitResult 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()->getRedeclContext()->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 1265MemInitResult 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 1362MemInitResult 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 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 MultiExprArg(&CopyCtorArg, 1)); 1552 break; 1553 } 1554 1555 case IIK_Move: 1556 assert(false && "Unhandled initializer kind!"); 1557 } 1558 1559 if (BaseInit.isInvalid()) 1560 return true; 1561 1562 BaseInit = SemaRef.MaybeCreateCXXExprWithTemporaries(BaseInit.get()); 1563 if (BaseInit.isInvalid()) 1564 return true; 1565 1566 CXXBaseInit = 1567 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1568 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1569 SourceLocation()), 1570 BaseSpec->isVirtual(), 1571 SourceLocation(), 1572 BaseInit.takeAs<Expr>(), 1573 SourceLocation()); 1574 1575 return false; 1576} 1577 1578static bool 1579BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1580 ImplicitInitializerKind ImplicitInitKind, 1581 FieldDecl *Field, 1582 CXXBaseOrMemberInitializer *&CXXMemberInit) { 1583 if (Field->isInvalidDecl()) 1584 return true; 1585 1586 SourceLocation Loc = Constructor->getLocation(); 1587 1588 if (ImplicitInitKind == IIK_Copy) { 1589 ParmVarDecl *Param = Constructor->getParamDecl(0); 1590 QualType ParamType = Param->getType().getNonReferenceType(); 1591 1592 Expr *MemberExprBase = 1593 DeclRefExpr::Create(SemaRef.Context, 0, SourceRange(), Param, 1594 Loc, ParamType, 0); 1595 1596 // Build a reference to this field within the parameter. 1597 CXXScopeSpec SS; 1598 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1599 Sema::LookupMemberName); 1600 MemberLookup.addDecl(Field, AS_public); 1601 MemberLookup.resolveKind(); 1602 ExprResult CopyCtorArg 1603 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1604 ParamType, Loc, 1605 /*IsArrow=*/false, 1606 SS, 1607 /*FirstQualifierInScope=*/0, 1608 MemberLookup, 1609 /*TemplateArgs=*/0); 1610 if (CopyCtorArg.isInvalid()) 1611 return true; 1612 1613 // When the field we are copying is an array, create index variables for 1614 // each dimension of the array. We use these index variables to subscript 1615 // the source array, and other clients (e.g., CodeGen) will perform the 1616 // necessary iteration with these index variables. 1617 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1618 QualType BaseType = Field->getType(); 1619 QualType SizeType = SemaRef.Context.getSizeType(); 1620 while (const ConstantArrayType *Array 1621 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1622 // Create the iteration variable for this array index. 1623 IdentifierInfo *IterationVarName = 0; 1624 { 1625 llvm::SmallString<8> Str; 1626 llvm::raw_svector_ostream OS(Str); 1627 OS << "__i" << IndexVariables.size(); 1628 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 1629 } 1630 VarDecl *IterationVar 1631 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, 1632 IterationVarName, SizeType, 1633 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 1634 SC_None, SC_None); 1635 IndexVariables.push_back(IterationVar); 1636 1637 // Create a reference to the iteration variable. 1638 ExprResult IterationVarRef 1639 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, Loc); 1640 assert(!IterationVarRef.isInvalid() && 1641 "Reference to invented variable cannot fail!"); 1642 1643 // Subscript the array with this iteration variable. 1644 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 1645 Loc, 1646 IterationVarRef.take(), 1647 Loc); 1648 if (CopyCtorArg.isInvalid()) 1649 return true; 1650 1651 BaseType = Array->getElementType(); 1652 } 1653 1654 // Construct the entity that we will be initializing. For an array, this 1655 // will be first element in the array, which may require several levels 1656 // of array-subscript entities. 1657 llvm::SmallVector<InitializedEntity, 4> Entities; 1658 Entities.reserve(1 + IndexVariables.size()); 1659 Entities.push_back(InitializedEntity::InitializeMember(Field)); 1660 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 1661 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 1662 0, 1663 Entities.back())); 1664 1665 // Direct-initialize to use the copy constructor. 1666 InitializationKind InitKind = 1667 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 1668 1669 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 1670 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 1671 &CopyCtorArgE, 1); 1672 1673 ExprResult MemberInit 1674 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 1675 MultiExprArg(&CopyCtorArgE, 1)); 1676 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1677 if (MemberInit.isInvalid()) 1678 return true; 1679 1680 CXXMemberInit 1681 = CXXBaseOrMemberInitializer::Create(SemaRef.Context, Field, Loc, Loc, 1682 MemberInit.takeAs<Expr>(), Loc, 1683 IndexVariables.data(), 1684 IndexVariables.size()); 1685 return false; 1686 } 1687 1688 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 1689 1690 QualType FieldBaseElementType = 1691 SemaRef.Context.getBaseElementType(Field->getType()); 1692 1693 if (FieldBaseElementType->isRecordType()) { 1694 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 1695 InitializationKind InitKind = 1696 InitializationKind::CreateDefault(Loc); 1697 1698 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1699 ExprResult MemberInit = 1700 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 1701 if (MemberInit.isInvalid()) 1702 return true; 1703 1704 MemberInit = SemaRef.MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 1705 if (MemberInit.isInvalid()) 1706 return true; 1707 1708 CXXMemberInit = 1709 new (SemaRef.Context) CXXBaseOrMemberInitializer(SemaRef.Context, 1710 Field, Loc, Loc, 1711 MemberInit.get(), 1712 Loc); 1713 return false; 1714 } 1715 1716 if (FieldBaseElementType->isReferenceType()) { 1717 SemaRef.Diag(Constructor->getLocation(), 1718 diag::err_uninitialized_member_in_ctor) 1719 << (int)Constructor->isImplicit() 1720 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1721 << 0 << Field->getDeclName(); 1722 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1723 return true; 1724 } 1725 1726 if (FieldBaseElementType.isConstQualified()) { 1727 SemaRef.Diag(Constructor->getLocation(), 1728 diag::err_uninitialized_member_in_ctor) 1729 << (int)Constructor->isImplicit() 1730 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 1731 << 1 << Field->getDeclName(); 1732 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 1733 return true; 1734 } 1735 1736 // Nothing to initialize. 1737 CXXMemberInit = 0; 1738 return false; 1739} 1740 1741namespace { 1742struct BaseAndFieldInfo { 1743 Sema &S; 1744 CXXConstructorDecl *Ctor; 1745 bool AnyErrorsInInits; 1746 ImplicitInitializerKind IIK; 1747 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1748 llvm::SmallVector<CXXBaseOrMemberInitializer*, 8> AllToInit; 1749 1750 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 1751 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 1752 // FIXME: Handle implicit move constructors. 1753 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 1754 IIK = IIK_Copy; 1755 else 1756 IIK = IIK_Default; 1757 } 1758}; 1759} 1760 1761static void RecordFieldInitializer(BaseAndFieldInfo &Info, 1762 FieldDecl *Top, FieldDecl *Field, 1763 CXXBaseOrMemberInitializer *Init) { 1764 // If the member doesn't need to be initialized, Init will still be null. 1765 if (!Init) 1766 return; 1767 1768 Info.AllToInit.push_back(Init); 1769 if (Field != Top) { 1770 Init->setMember(Top); 1771 Init->setAnonUnionMember(Field); 1772 } 1773} 1774 1775static bool CollectFieldInitializer(BaseAndFieldInfo &Info, 1776 FieldDecl *Top, FieldDecl *Field) { 1777 1778 // Overwhelmingly common case: we have a direct initializer for this field. 1779 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(Field)) { 1780 RecordFieldInitializer(Info, Top, Field, Init); 1781 return false; 1782 } 1783 1784 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 1785 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 1786 assert(FieldClassType && "anonymous struct/union without record type"); 1787 CXXRecordDecl *FieldClassDecl 1788 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1789 1790 // Even though union members never have non-trivial default 1791 // constructions in C++03, we still build member initializers for aggregate 1792 // record types which can be union members, and C++0x allows non-trivial 1793 // default constructors for union members, so we ensure that only one 1794 // member is initialized for these. 1795 if (FieldClassDecl->isUnion()) { 1796 // First check for an explicit initializer for one field. 1797 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1798 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1799 if (CXXBaseOrMemberInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 1800 RecordFieldInitializer(Info, Top, *FA, Init); 1801 1802 // Once we've initialized a field of an anonymous union, the union 1803 // field in the class is also initialized, so exit immediately. 1804 return false; 1805 } else if ((*FA)->isAnonymousStructOrUnion()) { 1806 if (CollectFieldInitializer(Info, Top, *FA)) 1807 return true; 1808 } 1809 } 1810 1811 // Fallthrough and construct a default initializer for the union as 1812 // a whole, which can call its default constructor if such a thing exists 1813 // (C++0x perhaps). FIXME: It's not clear that this is the correct 1814 // behavior going forward with C++0x, when anonymous unions there are 1815 // finalized, we should revisit this. 1816 } else { 1817 // For structs, we simply descend through to initialize all members where 1818 // necessary. 1819 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1820 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1821 if (CollectFieldInitializer(Info, Top, *FA)) 1822 return true; 1823 } 1824 } 1825 } 1826 1827 // Don't try to build an implicit initializer if there were semantic 1828 // errors in any of the initializers (and therefore we might be 1829 // missing some that the user actually wrote). 1830 if (Info.AnyErrorsInInits) 1831 return false; 1832 1833 CXXBaseOrMemberInitializer *Init = 0; 1834 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 1835 return true; 1836 1837 RecordFieldInitializer(Info, Top, Field, Init); 1838 return false; 1839} 1840 1841bool 1842Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1843 CXXBaseOrMemberInitializer **Initializers, 1844 unsigned NumInitializers, 1845 bool AnyErrors) { 1846 if (Constructor->getDeclContext()->isDependentContext()) { 1847 // Just store the initializers as written, they will be checked during 1848 // instantiation. 1849 if (NumInitializers > 0) { 1850 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1851 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1852 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1853 memcpy(baseOrMemberInitializers, Initializers, 1854 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1855 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1856 } 1857 1858 return false; 1859 } 1860 1861 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 1862 1863 // We need to build the initializer AST according to order of construction 1864 // and not what user specified in the Initializers list. 1865 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 1866 if (!ClassDecl) 1867 return true; 1868 1869 bool HadError = false; 1870 1871 for (unsigned i = 0; i < NumInitializers; i++) { 1872 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1873 1874 if (Member->isBaseInitializer()) 1875 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1876 else 1877 Info.AllBaseFields[Member->getMember()] = Member; 1878 } 1879 1880 // Keep track of the direct virtual bases. 1881 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 1882 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 1883 E = ClassDecl->bases_end(); I != E; ++I) { 1884 if (I->isVirtual()) 1885 DirectVBases.insert(I); 1886 } 1887 1888 // Push virtual bases before others. 1889 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1890 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1891 1892 if (CXXBaseOrMemberInitializer *Value 1893 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1894 Info.AllToInit.push_back(Value); 1895 } else if (!AnyErrors) { 1896 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 1897 CXXBaseOrMemberInitializer *CXXBaseInit; 1898 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1899 VBase, IsInheritedVirtualBase, 1900 CXXBaseInit)) { 1901 HadError = true; 1902 continue; 1903 } 1904 1905 Info.AllToInit.push_back(CXXBaseInit); 1906 } 1907 } 1908 1909 // Non-virtual bases. 1910 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1911 E = ClassDecl->bases_end(); Base != E; ++Base) { 1912 // Virtuals are in the virtual base list and already constructed. 1913 if (Base->isVirtual()) 1914 continue; 1915 1916 if (CXXBaseOrMemberInitializer *Value 1917 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1918 Info.AllToInit.push_back(Value); 1919 } else if (!AnyErrors) { 1920 CXXBaseOrMemberInitializer *CXXBaseInit; 1921 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 1922 Base, /*IsInheritedVirtualBase=*/false, 1923 CXXBaseInit)) { 1924 HadError = true; 1925 continue; 1926 } 1927 1928 Info.AllToInit.push_back(CXXBaseInit); 1929 } 1930 } 1931 1932 // Fields. 1933 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1934 E = ClassDecl->field_end(); Field != E; ++Field) { 1935 if ((*Field)->getType()->isIncompleteArrayType()) { 1936 assert(ClassDecl->hasFlexibleArrayMember() && 1937 "Incomplete array type is not valid"); 1938 continue; 1939 } 1940 if (CollectFieldInitializer(Info, *Field, *Field)) 1941 HadError = true; 1942 } 1943 1944 NumInitializers = Info.AllToInit.size(); 1945 if (NumInitializers > 0) { 1946 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1947 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1948 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1949 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 1950 NumInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1951 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1952 1953 // Constructors implicitly reference the base and member 1954 // destructors. 1955 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 1956 Constructor->getParent()); 1957 } 1958 1959 return HadError; 1960} 1961 1962static void *GetKeyForTopLevelField(FieldDecl *Field) { 1963 // For anonymous unions, use the class declaration as the key. 1964 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1965 if (RT->getDecl()->isAnonymousStructOrUnion()) 1966 return static_cast<void *>(RT->getDecl()); 1967 } 1968 return static_cast<void *>(Field); 1969} 1970 1971static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 1972 return Context.getCanonicalType(BaseType).getTypePtr(); 1973} 1974 1975static void *GetKeyForMember(ASTContext &Context, 1976 CXXBaseOrMemberInitializer *Member, 1977 bool MemberMaybeAnon = false) { 1978 if (!Member->isMemberInitializer()) 1979 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 1980 1981 // For fields injected into the class via declaration of an anonymous union, 1982 // use its anonymous union class declaration as the unique key. 1983 FieldDecl *Field = Member->getMember(); 1984 1985 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1986 // data member of the class. Data member used in the initializer list is 1987 // in AnonUnionMember field. 1988 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1989 Field = Member->getAnonUnionMember(); 1990 1991 // If the field is a member of an anonymous struct or union, our key 1992 // is the anonymous record decl that's a direct child of the class. 1993 RecordDecl *RD = Field->getParent(); 1994 if (RD->isAnonymousStructOrUnion()) { 1995 while (true) { 1996 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 1997 if (Parent->isAnonymousStructOrUnion()) 1998 RD = Parent; 1999 else 2000 break; 2001 } 2002 2003 return static_cast<void *>(RD); 2004 } 2005 2006 return static_cast<void *>(Field); 2007} 2008 2009static void 2010DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2011 const CXXConstructorDecl *Constructor, 2012 CXXBaseOrMemberInitializer **Inits, 2013 unsigned NumInits) { 2014 if (Constructor->getDeclContext()->isDependentContext()) 2015 return; 2016 2017 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order) 2018 == Diagnostic::Ignored) 2019 return; 2020 2021 // Build the list of bases and members in the order that they'll 2022 // actually be initialized. The explicit initializers should be in 2023 // this same order but may be missing things. 2024 llvm::SmallVector<const void*, 32> IdealInitKeys; 2025 2026 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2027 2028 // 1. Virtual bases. 2029 for (CXXRecordDecl::base_class_const_iterator VBase = 2030 ClassDecl->vbases_begin(), 2031 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2032 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2033 2034 // 2. Non-virtual bases. 2035 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2036 E = ClassDecl->bases_end(); Base != E; ++Base) { 2037 if (Base->isVirtual()) 2038 continue; 2039 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2040 } 2041 2042 // 3. Direct fields. 2043 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2044 E = ClassDecl->field_end(); Field != E; ++Field) 2045 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2046 2047 unsigned NumIdealInits = IdealInitKeys.size(); 2048 unsigned IdealIndex = 0; 2049 2050 CXXBaseOrMemberInitializer *PrevInit = 0; 2051 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2052 CXXBaseOrMemberInitializer *Init = Inits[InitIndex]; 2053 void *InitKey = GetKeyForMember(SemaRef.Context, Init, true); 2054 2055 // Scan forward to try to find this initializer in the idealized 2056 // initializers list. 2057 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2058 if (InitKey == IdealInitKeys[IdealIndex]) 2059 break; 2060 2061 // If we didn't find this initializer, it must be because we 2062 // scanned past it on a previous iteration. That can only 2063 // happen if we're out of order; emit a warning. 2064 if (IdealIndex == NumIdealInits && PrevInit) { 2065 Sema::SemaDiagnosticBuilder D = 2066 SemaRef.Diag(PrevInit->getSourceLocation(), 2067 diag::warn_initializer_out_of_order); 2068 2069 if (PrevInit->isMemberInitializer()) 2070 D << 0 << PrevInit->getMember()->getDeclName(); 2071 else 2072 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2073 2074 if (Init->isMemberInitializer()) 2075 D << 0 << Init->getMember()->getDeclName(); 2076 else 2077 D << 1 << Init->getBaseClassInfo()->getType(); 2078 2079 // Move back to the initializer's location in the ideal list. 2080 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2081 if (InitKey == IdealInitKeys[IdealIndex]) 2082 break; 2083 2084 assert(IdealIndex != NumIdealInits && 2085 "initializer not found in initializer list"); 2086 } 2087 2088 PrevInit = Init; 2089 } 2090} 2091 2092namespace { 2093bool CheckRedundantInit(Sema &S, 2094 CXXBaseOrMemberInitializer *Init, 2095 CXXBaseOrMemberInitializer *&PrevInit) { 2096 if (!PrevInit) { 2097 PrevInit = Init; 2098 return false; 2099 } 2100 2101 if (FieldDecl *Field = Init->getMember()) 2102 S.Diag(Init->getSourceLocation(), 2103 diag::err_multiple_mem_initialization) 2104 << Field->getDeclName() 2105 << Init->getSourceRange(); 2106 else { 2107 Type *BaseClass = Init->getBaseClass(); 2108 assert(BaseClass && "neither field nor base"); 2109 S.Diag(Init->getSourceLocation(), 2110 diag::err_multiple_base_initialization) 2111 << QualType(BaseClass, 0) 2112 << Init->getSourceRange(); 2113 } 2114 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2115 << 0 << PrevInit->getSourceRange(); 2116 2117 return true; 2118} 2119 2120typedef std::pair<NamedDecl *, CXXBaseOrMemberInitializer *> UnionEntry; 2121typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2122 2123bool CheckRedundantUnionInit(Sema &S, 2124 CXXBaseOrMemberInitializer *Init, 2125 RedundantUnionMap &Unions) { 2126 FieldDecl *Field = Init->getMember(); 2127 RecordDecl *Parent = Field->getParent(); 2128 if (!Parent->isAnonymousStructOrUnion()) 2129 return false; 2130 2131 NamedDecl *Child = Field; 2132 do { 2133 if (Parent->isUnion()) { 2134 UnionEntry &En = Unions[Parent]; 2135 if (En.first && En.first != Child) { 2136 S.Diag(Init->getSourceLocation(), 2137 diag::err_multiple_mem_union_initialization) 2138 << Field->getDeclName() 2139 << Init->getSourceRange(); 2140 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2141 << 0 << En.second->getSourceRange(); 2142 return true; 2143 } else if (!En.first) { 2144 En.first = Child; 2145 En.second = Init; 2146 } 2147 } 2148 2149 Child = Parent; 2150 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2151 } while (Parent->isAnonymousStructOrUnion()); 2152 2153 return false; 2154} 2155} 2156 2157/// ActOnMemInitializers - Handle the member initializers for a constructor. 2158void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2159 SourceLocation ColonLoc, 2160 MemInitTy **meminits, unsigned NumMemInits, 2161 bool AnyErrors) { 2162 if (!ConstructorDecl) 2163 return; 2164 2165 AdjustDeclIfTemplate(ConstructorDecl); 2166 2167 CXXConstructorDecl *Constructor 2168 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2169 2170 if (!Constructor) { 2171 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2172 return; 2173 } 2174 2175 CXXBaseOrMemberInitializer **MemInits = 2176 reinterpret_cast<CXXBaseOrMemberInitializer **>(meminits); 2177 2178 // Mapping for the duplicate initializers check. 2179 // For member initializers, this is keyed with a FieldDecl*. 2180 // For base initializers, this is keyed with a Type*. 2181 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *> Members; 2182 2183 // Mapping for the inconsistent anonymous-union initializers check. 2184 RedundantUnionMap MemberUnions; 2185 2186 bool HadError = false; 2187 for (unsigned i = 0; i < NumMemInits; i++) { 2188 CXXBaseOrMemberInitializer *Init = MemInits[i]; 2189 2190 // Set the source order index. 2191 Init->setSourceOrder(i); 2192 2193 if (Init->isMemberInitializer()) { 2194 FieldDecl *Field = Init->getMember(); 2195 if (CheckRedundantInit(*this, Init, Members[Field]) || 2196 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2197 HadError = true; 2198 } else { 2199 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2200 if (CheckRedundantInit(*this, Init, Members[Key])) 2201 HadError = true; 2202 } 2203 } 2204 2205 if (HadError) 2206 return; 2207 2208 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2209 2210 SetBaseOrMemberInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2211} 2212 2213void 2214Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2215 CXXRecordDecl *ClassDecl) { 2216 // Ignore dependent contexts. 2217 if (ClassDecl->isDependentContext()) 2218 return; 2219 2220 // FIXME: all the access-control diagnostics are positioned on the 2221 // field/base declaration. That's probably good; that said, the 2222 // user might reasonably want to know why the destructor is being 2223 // emitted, and we currently don't say. 2224 2225 // Non-static data members. 2226 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2227 E = ClassDecl->field_end(); I != E; ++I) { 2228 FieldDecl *Field = *I; 2229 if (Field->isInvalidDecl()) 2230 continue; 2231 QualType FieldType = Context.getBaseElementType(Field->getType()); 2232 2233 const RecordType* RT = FieldType->getAs<RecordType>(); 2234 if (!RT) 2235 continue; 2236 2237 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2238 if (FieldClassDecl->hasTrivialDestructor()) 2239 continue; 2240 2241 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2242 CheckDestructorAccess(Field->getLocation(), Dtor, 2243 PDiag(diag::err_access_dtor_field) 2244 << Field->getDeclName() 2245 << FieldType); 2246 2247 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2248 } 2249 2250 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2251 2252 // Bases. 2253 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2254 E = ClassDecl->bases_end(); Base != E; ++Base) { 2255 // Bases are always records in a well-formed non-dependent class. 2256 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2257 2258 // Remember direct virtual bases. 2259 if (Base->isVirtual()) 2260 DirectVirtualBases.insert(RT); 2261 2262 // Ignore trivial destructors. 2263 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2264 if (BaseClassDecl->hasTrivialDestructor()) 2265 continue; 2266 2267 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2268 2269 // FIXME: caret should be on the start of the class name 2270 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2271 PDiag(diag::err_access_dtor_base) 2272 << Base->getType() 2273 << Base->getSourceRange()); 2274 2275 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2276 } 2277 2278 // Virtual bases. 2279 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2280 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2281 2282 // Bases are always records in a well-formed non-dependent class. 2283 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2284 2285 // Ignore direct virtual bases. 2286 if (DirectVirtualBases.count(RT)) 2287 continue; 2288 2289 // Ignore trivial destructors. 2290 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2291 if (BaseClassDecl->hasTrivialDestructor()) 2292 continue; 2293 2294 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2295 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2296 PDiag(diag::err_access_dtor_vbase) 2297 << VBase->getType()); 2298 2299 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2300 } 2301} 2302 2303void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2304 if (!CDtorDecl) 2305 return; 2306 2307 if (CXXConstructorDecl *Constructor 2308 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2309 SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2310} 2311 2312bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2313 unsigned DiagID, AbstractDiagSelID SelID) { 2314 if (SelID == -1) 2315 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2316 else 2317 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2318} 2319 2320bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2321 const PartialDiagnostic &PD) { 2322 if (!getLangOptions().CPlusPlus) 2323 return false; 2324 2325 if (const ArrayType *AT = Context.getAsArrayType(T)) 2326 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2327 2328 if (const PointerType *PT = T->getAs<PointerType>()) { 2329 // Find the innermost pointer type. 2330 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2331 PT = T; 2332 2333 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2334 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2335 } 2336 2337 const RecordType *RT = T->getAs<RecordType>(); 2338 if (!RT) 2339 return false; 2340 2341 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2342 2343 // We can't answer whether something is abstract until it has a 2344 // definition. If it's currently being defined, we'll walk back 2345 // over all the declarations when we have a full definition. 2346 const CXXRecordDecl *Def = RD->getDefinition(); 2347 if (!Def || Def->isBeingDefined()) 2348 return false; 2349 2350 if (!RD->isAbstract()) 2351 return false; 2352 2353 Diag(Loc, PD) << RD->getDeclName(); 2354 DiagnoseAbstractType(RD); 2355 2356 return true; 2357} 2358 2359void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2360 // Check if we've already emitted the list of pure virtual functions 2361 // for this class. 2362 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2363 return; 2364 2365 CXXFinalOverriderMap FinalOverriders; 2366 RD->getFinalOverriders(FinalOverriders); 2367 2368 // Keep a set of seen pure methods so we won't diagnose the same method 2369 // more than once. 2370 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2371 2372 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2373 MEnd = FinalOverriders.end(); 2374 M != MEnd; 2375 ++M) { 2376 for (OverridingMethods::iterator SO = M->second.begin(), 2377 SOEnd = M->second.end(); 2378 SO != SOEnd; ++SO) { 2379 // C++ [class.abstract]p4: 2380 // A class is abstract if it contains or inherits at least one 2381 // pure virtual function for which the final overrider is pure 2382 // virtual. 2383 2384 // 2385 if (SO->second.size() != 1) 2386 continue; 2387 2388 if (!SO->second.front().Method->isPure()) 2389 continue; 2390 2391 if (!SeenPureMethods.insert(SO->second.front().Method)) 2392 continue; 2393 2394 Diag(SO->second.front().Method->getLocation(), 2395 diag::note_pure_virtual_function) 2396 << SO->second.front().Method->getDeclName(); 2397 } 2398 } 2399 2400 if (!PureVirtualClassDiagSet) 2401 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2402 PureVirtualClassDiagSet->insert(RD); 2403} 2404 2405namespace { 2406struct AbstractUsageInfo { 2407 Sema &S; 2408 CXXRecordDecl *Record; 2409 CanQualType AbstractType; 2410 bool Invalid; 2411 2412 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2413 : S(S), Record(Record), 2414 AbstractType(S.Context.getCanonicalType( 2415 S.Context.getTypeDeclType(Record))), 2416 Invalid(false) {} 2417 2418 void DiagnoseAbstractType() { 2419 if (Invalid) return; 2420 S.DiagnoseAbstractType(Record); 2421 Invalid = true; 2422 } 2423 2424 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2425}; 2426 2427struct CheckAbstractUsage { 2428 AbstractUsageInfo &Info; 2429 const NamedDecl *Ctx; 2430 2431 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2432 : Info(Info), Ctx(Ctx) {} 2433 2434 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2435 switch (TL.getTypeLocClass()) { 2436#define ABSTRACT_TYPELOC(CLASS, PARENT) 2437#define TYPELOC(CLASS, PARENT) \ 2438 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2439#include "clang/AST/TypeLocNodes.def" 2440 } 2441 } 2442 2443 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2444 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2445 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2446 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2447 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2448 } 2449 } 2450 2451 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2452 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2453 } 2454 2455 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2456 // Visit the type parameters from a permissive context. 2457 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2458 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2459 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2460 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2461 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2462 // TODO: other template argument types? 2463 } 2464 } 2465 2466 // Visit pointee types from a permissive context. 2467#define CheckPolymorphic(Type) \ 2468 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2469 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2470 } 2471 CheckPolymorphic(PointerTypeLoc) 2472 CheckPolymorphic(ReferenceTypeLoc) 2473 CheckPolymorphic(MemberPointerTypeLoc) 2474 CheckPolymorphic(BlockPointerTypeLoc) 2475 2476 /// Handle all the types we haven't given a more specific 2477 /// implementation for above. 2478 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2479 // Every other kind of type that we haven't called out already 2480 // that has an inner type is either (1) sugar or (2) contains that 2481 // inner type in some way as a subobject. 2482 if (TypeLoc Next = TL.getNextTypeLoc()) 2483 return Visit(Next, Sel); 2484 2485 // If there's no inner type and we're in a permissive context, 2486 // don't diagnose. 2487 if (Sel == Sema::AbstractNone) return; 2488 2489 // Check whether the type matches the abstract type. 2490 QualType T = TL.getType(); 2491 if (T->isArrayType()) { 2492 Sel = Sema::AbstractArrayType; 2493 T = Info.S.Context.getBaseElementType(T); 2494 } 2495 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2496 if (CT != Info.AbstractType) return; 2497 2498 // It matched; do some magic. 2499 if (Sel == Sema::AbstractArrayType) { 2500 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2501 << T << TL.getSourceRange(); 2502 } else { 2503 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2504 << Sel << T << TL.getSourceRange(); 2505 } 2506 Info.DiagnoseAbstractType(); 2507 } 2508}; 2509 2510void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2511 Sema::AbstractDiagSelID Sel) { 2512 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2513} 2514 2515} 2516 2517/// Check for invalid uses of an abstract type in a method declaration. 2518static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2519 CXXMethodDecl *MD) { 2520 // No need to do the check on definitions, which require that 2521 // the return/param types be complete. 2522 if (MD->isThisDeclarationADefinition()) 2523 return; 2524 2525 // For safety's sake, just ignore it if we don't have type source 2526 // information. This should never happen for non-implicit methods, 2527 // but... 2528 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2529 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2530} 2531 2532/// Check for invalid uses of an abstract type within a class definition. 2533static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2534 CXXRecordDecl *RD) { 2535 for (CXXRecordDecl::decl_iterator 2536 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2537 Decl *D = *I; 2538 if (D->isImplicit()) continue; 2539 2540 // Methods and method templates. 2541 if (isa<CXXMethodDecl>(D)) { 2542 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2543 } else if (isa<FunctionTemplateDecl>(D)) { 2544 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2545 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2546 2547 // Fields and static variables. 2548 } else if (isa<FieldDecl>(D)) { 2549 FieldDecl *FD = cast<FieldDecl>(D); 2550 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2551 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2552 } else if (isa<VarDecl>(D)) { 2553 VarDecl *VD = cast<VarDecl>(D); 2554 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2555 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2556 2557 // Nested classes and class templates. 2558 } else if (isa<CXXRecordDecl>(D)) { 2559 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 2560 } else if (isa<ClassTemplateDecl>(D)) { 2561 CheckAbstractClassUsage(Info, 2562 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 2563 } 2564 } 2565} 2566 2567/// \brief Perform semantic checks on a class definition that has been 2568/// completing, introducing implicitly-declared members, checking for 2569/// abstract types, etc. 2570void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 2571 if (!Record || Record->isInvalidDecl()) 2572 return; 2573 2574 if (!Record->isDependentType()) 2575 AddImplicitlyDeclaredMembersToClass(Record); 2576 2577 if (Record->isInvalidDecl()) 2578 return; 2579 2580 // Set access bits correctly on the directly-declared conversions. 2581 UnresolvedSetImpl *Convs = Record->getConversionFunctions(); 2582 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); I != E; ++I) 2583 Convs->setAccess(I, (*I)->getAccess()); 2584 2585 // Determine whether we need to check for final overriders. We do 2586 // this either when there are virtual base classes (in which case we 2587 // may end up finding multiple final overriders for a given virtual 2588 // function) or any of the base classes is abstract (in which case 2589 // we might detect that this class is abstract). 2590 bool CheckFinalOverriders = false; 2591 if (Record->isPolymorphic() && !Record->isInvalidDecl() && 2592 !Record->isDependentType()) { 2593 if (Record->getNumVBases()) 2594 CheckFinalOverriders = true; 2595 else if (!Record->isAbstract()) { 2596 for (CXXRecordDecl::base_class_const_iterator B = Record->bases_begin(), 2597 BEnd = Record->bases_end(); 2598 B != BEnd; ++B) { 2599 CXXRecordDecl *BaseDecl 2600 = cast<CXXRecordDecl>(B->getType()->getAs<RecordType>()->getDecl()); 2601 if (BaseDecl->isAbstract()) { 2602 CheckFinalOverriders = true; 2603 break; 2604 } 2605 } 2606 } 2607 } 2608 2609 if (CheckFinalOverriders) { 2610 CXXFinalOverriderMap FinalOverriders; 2611 Record->getFinalOverriders(FinalOverriders); 2612 2613 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2614 MEnd = FinalOverriders.end(); 2615 M != MEnd; ++M) { 2616 for (OverridingMethods::iterator SO = M->second.begin(), 2617 SOEnd = M->second.end(); 2618 SO != SOEnd; ++SO) { 2619 assert(SO->second.size() > 0 && 2620 "All virtual functions have overridding virtual functions"); 2621 if (SO->second.size() == 1) { 2622 // C++ [class.abstract]p4: 2623 // A class is abstract if it contains or inherits at least one 2624 // pure virtual function for which the final overrider is pure 2625 // virtual. 2626 if (SO->second.front().Method->isPure()) 2627 Record->setAbstract(true); 2628 continue; 2629 } 2630 2631 // C++ [class.virtual]p2: 2632 // In a derived class, if a virtual member function of a base 2633 // class subobject has more than one final overrider the 2634 // program is ill-formed. 2635 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 2636 << (NamedDecl *)M->first << Record; 2637 Diag(M->first->getLocation(), diag::note_overridden_virtual_function); 2638 for (OverridingMethods::overriding_iterator OM = SO->second.begin(), 2639 OMEnd = SO->second.end(); 2640 OM != OMEnd; ++OM) 2641 Diag(OM->Method->getLocation(), diag::note_final_overrider) 2642 << (NamedDecl *)M->first << OM->Method->getParent(); 2643 2644 Record->setInvalidDecl(); 2645 } 2646 } 2647 } 2648 2649 if (Record->isAbstract() && !Record->isInvalidDecl()) { 2650 AbstractUsageInfo Info(*this, Record); 2651 CheckAbstractClassUsage(Info, Record); 2652 } 2653 2654 // If this is not an aggregate type and has no user-declared constructor, 2655 // complain about any non-static data members of reference or const scalar 2656 // type, since they will never get initializers. 2657 if (!Record->isInvalidDecl() && !Record->isDependentType() && 2658 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 2659 bool Complained = false; 2660 for (RecordDecl::field_iterator F = Record->field_begin(), 2661 FEnd = Record->field_end(); 2662 F != FEnd; ++F) { 2663 if (F->getType()->isReferenceType() || 2664 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 2665 if (!Complained) { 2666 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 2667 << Record->getTagKind() << Record; 2668 Complained = true; 2669 } 2670 2671 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 2672 << F->getType()->isReferenceType() 2673 << F->getDeclName(); 2674 } 2675 } 2676 } 2677 2678 if (Record->isDynamicClass()) 2679 DynamicClasses.push_back(Record); 2680} 2681 2682void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 2683 Decl *TagDecl, 2684 SourceLocation LBrac, 2685 SourceLocation RBrac, 2686 AttributeList *AttrList) { 2687 if (!TagDecl) 2688 return; 2689 2690 AdjustDeclIfTemplate(TagDecl); 2691 2692 ActOnFields(S, RLoc, TagDecl, 2693 // strict aliasing violation! 2694 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 2695 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 2696 2697 CheckCompletedCXXClass( 2698 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 2699} 2700 2701namespace { 2702 /// \brief Helper class that collects exception specifications for 2703 /// implicitly-declared special member functions. 2704 class ImplicitExceptionSpecification { 2705 ASTContext &Context; 2706 bool AllowsAllExceptions; 2707 llvm::SmallPtrSet<CanQualType, 4> ExceptionsSeen; 2708 llvm::SmallVector<QualType, 4> Exceptions; 2709 2710 public: 2711 explicit ImplicitExceptionSpecification(ASTContext &Context) 2712 : Context(Context), AllowsAllExceptions(false) { } 2713 2714 /// \brief Whether the special member function should have any 2715 /// exception specification at all. 2716 bool hasExceptionSpecification() const { 2717 return !AllowsAllExceptions; 2718 } 2719 2720 /// \brief Whether the special member function should have a 2721 /// throw(...) exception specification (a Microsoft extension). 2722 bool hasAnyExceptionSpecification() const { 2723 return false; 2724 } 2725 2726 /// \brief The number of exceptions in the exception specification. 2727 unsigned size() const { return Exceptions.size(); } 2728 2729 /// \brief The set of exceptions in the exception specification. 2730 const QualType *data() const { return Exceptions.data(); } 2731 2732 /// \brief Note that 2733 void CalledDecl(CXXMethodDecl *Method) { 2734 // If we already know that we allow all exceptions, do nothing. 2735 if (AllowsAllExceptions || !Method) 2736 return; 2737 2738 const FunctionProtoType *Proto 2739 = Method->getType()->getAs<FunctionProtoType>(); 2740 2741 // If this function can throw any exceptions, make a note of that. 2742 if (!Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec()) { 2743 AllowsAllExceptions = true; 2744 ExceptionsSeen.clear(); 2745 Exceptions.clear(); 2746 return; 2747 } 2748 2749 // Record the exceptions in this function's exception specification. 2750 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 2751 EEnd = Proto->exception_end(); 2752 E != EEnd; ++E) 2753 if (ExceptionsSeen.insert(Context.getCanonicalType(*E))) 2754 Exceptions.push_back(*E); 2755 } 2756 }; 2757} 2758 2759 2760/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 2761/// special functions, such as the default constructor, copy 2762/// constructor, or destructor, to the given C++ class (C++ 2763/// [special]p1). This routine can only be executed just before the 2764/// definition of the class is complete. 2765void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 2766 if (!ClassDecl->hasUserDeclaredConstructor()) 2767 ++ASTContext::NumImplicitDefaultConstructors; 2768 2769 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 2770 ++ASTContext::NumImplicitCopyConstructors; 2771 2772 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2773 ++ASTContext::NumImplicitCopyAssignmentOperators; 2774 2775 // If we have a dynamic class, then the copy assignment operator may be 2776 // virtual, so we have to declare it immediately. This ensures that, e.g., 2777 // it shows up in the right place in the vtable and that we diagnose 2778 // problems with the implicit exception specification. 2779 if (ClassDecl->isDynamicClass()) 2780 DeclareImplicitCopyAssignment(ClassDecl); 2781 } 2782 2783 if (!ClassDecl->hasUserDeclaredDestructor()) { 2784 ++ASTContext::NumImplicitDestructors; 2785 2786 // If we have a dynamic class, then the destructor may be virtual, so we 2787 // have to declare the destructor immediately. This ensures that, e.g., it 2788 // shows up in the right place in the vtable and that we diagnose problems 2789 // with the implicit exception specification. 2790 if (ClassDecl->isDynamicClass()) 2791 DeclareImplicitDestructor(ClassDecl); 2792 } 2793} 2794 2795void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 2796 if (!D) 2797 return; 2798 2799 TemplateParameterList *Params = 0; 2800 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2801 Params = Template->getTemplateParameters(); 2802 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2803 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2804 Params = PartialSpec->getTemplateParameters(); 2805 else 2806 return; 2807 2808 for (TemplateParameterList::iterator Param = Params->begin(), 2809 ParamEnd = Params->end(); 2810 Param != ParamEnd; ++Param) { 2811 NamedDecl *Named = cast<NamedDecl>(*Param); 2812 if (Named->getDeclName()) { 2813 S->AddDecl(Named); 2814 IdResolver.AddDecl(Named); 2815 } 2816 } 2817} 2818 2819void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2820 if (!RecordD) return; 2821 AdjustDeclIfTemplate(RecordD); 2822 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 2823 PushDeclContext(S, Record); 2824} 2825 2826void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 2827 if (!RecordD) return; 2828 PopDeclContext(); 2829} 2830 2831/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2832/// parsing a top-level (non-nested) C++ class, and we are now 2833/// parsing those parts of the given Method declaration that could 2834/// not be parsed earlier (C++ [class.mem]p2), such as default 2835/// arguments. This action should enter the scope of the given 2836/// Method declaration as if we had just parsed the qualified method 2837/// name. However, it should not bring the parameters into scope; 2838/// that will be performed by ActOnDelayedCXXMethodParameter. 2839void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2840} 2841 2842/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2843/// C++ method declaration. We're (re-)introducing the given 2844/// function parameter into scope for use in parsing later parts of 2845/// the method declaration. For example, we could see an 2846/// ActOnParamDefaultArgument event for this parameter. 2847void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 2848 if (!ParamD) 2849 return; 2850 2851 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 2852 2853 // If this parameter has an unparsed default argument, clear it out 2854 // to make way for the parsed default argument. 2855 if (Param->hasUnparsedDefaultArg()) 2856 Param->setDefaultArg(0); 2857 2858 S->AddDecl(Param); 2859 if (Param->getDeclName()) 2860 IdResolver.AddDecl(Param); 2861} 2862 2863/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2864/// processing the delayed method declaration for Method. The method 2865/// declaration is now considered finished. There may be a separate 2866/// ActOnStartOfFunctionDef action later (not necessarily 2867/// immediately!) for this method, if it was also defined inside the 2868/// class body. 2869void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 2870 if (!MethodD) 2871 return; 2872 2873 AdjustDeclIfTemplate(MethodD); 2874 2875 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 2876 2877 // Now that we have our default arguments, check the constructor 2878 // again. It could produce additional diagnostics or affect whether 2879 // the class has implicitly-declared destructors, among other 2880 // things. 2881 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2882 CheckConstructor(Constructor); 2883 2884 // Check the default arguments, which we may have added. 2885 if (!Method->isInvalidDecl()) 2886 CheckCXXDefaultArguments(Method); 2887} 2888 2889/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2890/// the well-formedness of the constructor declarator @p D with type @p 2891/// R. If there are any errors in the declarator, this routine will 2892/// emit diagnostics and set the invalid bit to true. In any case, the type 2893/// will be updated to reflect a well-formed type for the constructor and 2894/// returned. 2895QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2896 StorageClass &SC) { 2897 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2898 2899 // C++ [class.ctor]p3: 2900 // A constructor shall not be virtual (10.3) or static (9.4). A 2901 // constructor can be invoked for a const, volatile or const 2902 // volatile object. A constructor shall not be declared const, 2903 // volatile, or const volatile (9.3.2). 2904 if (isVirtual) { 2905 if (!D.isInvalidType()) 2906 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2907 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2908 << SourceRange(D.getIdentifierLoc()); 2909 D.setInvalidType(); 2910 } 2911 if (SC == SC_Static) { 2912 if (!D.isInvalidType()) 2913 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2914 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2915 << SourceRange(D.getIdentifierLoc()); 2916 D.setInvalidType(); 2917 SC = SC_None; 2918 } 2919 2920 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2921 if (FTI.TypeQuals != 0) { 2922 if (FTI.TypeQuals & Qualifiers::Const) 2923 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2924 << "const" << SourceRange(D.getIdentifierLoc()); 2925 if (FTI.TypeQuals & Qualifiers::Volatile) 2926 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2927 << "volatile" << SourceRange(D.getIdentifierLoc()); 2928 if (FTI.TypeQuals & Qualifiers::Restrict) 2929 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2930 << "restrict" << SourceRange(D.getIdentifierLoc()); 2931 } 2932 2933 // Rebuild the function type "R" without any type qualifiers (in 2934 // case any of the errors above fired) and with "void" as the 2935 // return type, since constructors don't have return types. 2936 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2937 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2938 Proto->getNumArgs(), 2939 Proto->isVariadic(), 0, 2940 Proto->hasExceptionSpec(), 2941 Proto->hasAnyExceptionSpec(), 2942 Proto->getNumExceptions(), 2943 Proto->exception_begin(), 2944 Proto->getExtInfo()); 2945} 2946 2947/// CheckConstructor - Checks a fully-formed constructor for 2948/// well-formedness, issuing any diagnostics required. Returns true if 2949/// the constructor declarator is invalid. 2950void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2951 CXXRecordDecl *ClassDecl 2952 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2953 if (!ClassDecl) 2954 return Constructor->setInvalidDecl(); 2955 2956 // C++ [class.copy]p3: 2957 // A declaration of a constructor for a class X is ill-formed if 2958 // its first parameter is of type (optionally cv-qualified) X and 2959 // either there are no other parameters or else all other 2960 // parameters have default arguments. 2961 if (!Constructor->isInvalidDecl() && 2962 ((Constructor->getNumParams() == 1) || 2963 (Constructor->getNumParams() > 1 && 2964 Constructor->getParamDecl(1)->hasDefaultArg())) && 2965 Constructor->getTemplateSpecializationKind() 2966 != TSK_ImplicitInstantiation) { 2967 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2968 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2969 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2970 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2971 const char *ConstRef 2972 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 2973 : " const &"; 2974 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2975 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 2976 2977 // FIXME: Rather that making the constructor invalid, we should endeavor 2978 // to fix the type. 2979 Constructor->setInvalidDecl(); 2980 } 2981 } 2982 2983 // Notify the class that we've added a constructor. In principle we 2984 // don't need to do this for out-of-line declarations; in practice 2985 // we only instantiate the most recent declaration of a method, so 2986 // we have to call this for everything but friends. 2987 if (!Constructor->getFriendObjectKind()) 2988 ClassDecl->addedConstructor(Context, Constructor); 2989} 2990 2991/// CheckDestructor - Checks a fully-formed destructor definition for 2992/// well-formedness, issuing any diagnostics required. Returns true 2993/// on error. 2994bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2995 CXXRecordDecl *RD = Destructor->getParent(); 2996 2997 if (Destructor->isVirtual()) { 2998 SourceLocation Loc; 2999 3000 if (!Destructor->isImplicit()) 3001 Loc = Destructor->getLocation(); 3002 else 3003 Loc = RD->getLocation(); 3004 3005 // If we have a virtual destructor, look up the deallocation function 3006 FunctionDecl *OperatorDelete = 0; 3007 DeclarationName Name = 3008 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3009 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 3010 return true; 3011 3012 MarkDeclarationReferenced(Loc, OperatorDelete); 3013 3014 Destructor->setOperatorDelete(OperatorDelete); 3015 } 3016 3017 return false; 3018} 3019 3020static inline bool 3021FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 3022 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3023 FTI.ArgInfo[0].Param && 3024 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 3025} 3026 3027/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 3028/// the well-formednes of the destructor declarator @p D with type @p 3029/// R. If there are any errors in the declarator, this routine will 3030/// emit diagnostics and set the declarator to invalid. Even if this happens, 3031/// will be updated to reflect a well-formed type for the destructor and 3032/// returned. 3033QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 3034 StorageClass& SC) { 3035 // C++ [class.dtor]p1: 3036 // [...] A typedef-name that names a class is a class-name 3037 // (7.1.3); however, a typedef-name that names a class shall not 3038 // be used as the identifier in the declarator for a destructor 3039 // declaration. 3040 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 3041 if (isa<TypedefType>(DeclaratorType)) 3042 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 3043 << DeclaratorType; 3044 3045 // C++ [class.dtor]p2: 3046 // A destructor is used to destroy objects of its class type. A 3047 // destructor takes no parameters, and no return type can be 3048 // specified for it (not even void). The address of a destructor 3049 // shall not be taken. A destructor shall not be static. A 3050 // destructor can be invoked for a const, volatile or const 3051 // volatile object. A destructor shall not be declared const, 3052 // volatile or const volatile (9.3.2). 3053 if (SC == SC_Static) { 3054 if (!D.isInvalidType()) 3055 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 3056 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3057 << SourceRange(D.getIdentifierLoc()) 3058 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3059 3060 SC = SC_None; 3061 } 3062 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3063 // Destructors don't have return types, but the parser will 3064 // happily parse something like: 3065 // 3066 // class X { 3067 // float ~X(); 3068 // }; 3069 // 3070 // The return type will be eliminated later. 3071 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 3072 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3073 << SourceRange(D.getIdentifierLoc()); 3074 } 3075 3076 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3077 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 3078 if (FTI.TypeQuals & Qualifiers::Const) 3079 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3080 << "const" << SourceRange(D.getIdentifierLoc()); 3081 if (FTI.TypeQuals & Qualifiers::Volatile) 3082 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3083 << "volatile" << SourceRange(D.getIdentifierLoc()); 3084 if (FTI.TypeQuals & Qualifiers::Restrict) 3085 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 3086 << "restrict" << SourceRange(D.getIdentifierLoc()); 3087 D.setInvalidType(); 3088 } 3089 3090 // Make sure we don't have any parameters. 3091 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 3092 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 3093 3094 // Delete the parameters. 3095 FTI.freeArgs(); 3096 D.setInvalidType(); 3097 } 3098 3099 // Make sure the destructor isn't variadic. 3100 if (FTI.isVariadic) { 3101 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 3102 D.setInvalidType(); 3103 } 3104 3105 // Rebuild the function type "R" without any type qualifiers or 3106 // parameters (in case any of the errors above fired) and with 3107 // "void" as the return type, since destructors don't have return 3108 // types. 3109 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3110 if (!Proto) 3111 return QualType(); 3112 3113 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0, 3114 Proto->hasExceptionSpec(), 3115 Proto->hasAnyExceptionSpec(), 3116 Proto->getNumExceptions(), 3117 Proto->exception_begin(), 3118 Proto->getExtInfo()); 3119} 3120 3121/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 3122/// well-formednes of the conversion function declarator @p D with 3123/// type @p R. If there are any errors in the declarator, this routine 3124/// will emit diagnostics and return true. Otherwise, it will return 3125/// false. Either way, the type @p R will be updated to reflect a 3126/// well-formed type for the conversion operator. 3127void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 3128 StorageClass& SC) { 3129 // C++ [class.conv.fct]p1: 3130 // Neither parameter types nor return type can be specified. The 3131 // type of a conversion function (8.3.5) is "function taking no 3132 // parameter returning conversion-type-id." 3133 if (SC == SC_Static) { 3134 if (!D.isInvalidType()) 3135 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 3136 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 3137 << SourceRange(D.getIdentifierLoc()); 3138 D.setInvalidType(); 3139 SC = SC_None; 3140 } 3141 3142 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 3143 3144 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 3145 // Conversion functions don't have return types, but the parser will 3146 // happily parse something like: 3147 // 3148 // class X { 3149 // float operator bool(); 3150 // }; 3151 // 3152 // The return type will be changed later anyway. 3153 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 3154 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3155 << SourceRange(D.getIdentifierLoc()); 3156 D.setInvalidType(); 3157 } 3158 3159 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 3160 3161 // Make sure we don't have any parameters. 3162 if (Proto->getNumArgs() > 0) { 3163 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 3164 3165 // Delete the parameters. 3166 D.getTypeObject(0).Fun.freeArgs(); 3167 D.setInvalidType(); 3168 } else if (Proto->isVariadic()) { 3169 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 3170 D.setInvalidType(); 3171 } 3172 3173 // Diagnose "&operator bool()" and other such nonsense. This 3174 // is actually a gcc extension which we don't support. 3175 if (Proto->getResultType() != ConvType) { 3176 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 3177 << Proto->getResultType(); 3178 D.setInvalidType(); 3179 ConvType = Proto->getResultType(); 3180 } 3181 3182 // C++ [class.conv.fct]p4: 3183 // The conversion-type-id shall not represent a function type nor 3184 // an array type. 3185 if (ConvType->isArrayType()) { 3186 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 3187 ConvType = Context.getPointerType(ConvType); 3188 D.setInvalidType(); 3189 } else if (ConvType->isFunctionType()) { 3190 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 3191 ConvType = Context.getPointerType(ConvType); 3192 D.setInvalidType(); 3193 } 3194 3195 // Rebuild the function type "R" without any parameters (in case any 3196 // of the errors above fired) and with the conversion type as the 3197 // return type. 3198 if (D.isInvalidType()) { 3199 R = Context.getFunctionType(ConvType, 0, 0, false, 3200 Proto->getTypeQuals(), 3201 Proto->hasExceptionSpec(), 3202 Proto->hasAnyExceptionSpec(), 3203 Proto->getNumExceptions(), 3204 Proto->exception_begin(), 3205 Proto->getExtInfo()); 3206 } 3207 3208 // C++0x explicit conversion operators. 3209 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 3210 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3211 diag::warn_explicit_conversion_functions) 3212 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 3213} 3214 3215/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 3216/// the declaration of the given C++ conversion function. This routine 3217/// is responsible for recording the conversion function in the C++ 3218/// class, if possible. 3219Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 3220 assert(Conversion && "Expected to receive a conversion function declaration"); 3221 3222 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 3223 3224 // Make sure we aren't redeclaring the conversion function. 3225 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 3226 3227 // C++ [class.conv.fct]p1: 3228 // [...] A conversion function is never used to convert a 3229 // (possibly cv-qualified) object to the (possibly cv-qualified) 3230 // same object type (or a reference to it), to a (possibly 3231 // cv-qualified) base class of that type (or a reference to it), 3232 // or to (possibly cv-qualified) void. 3233 // FIXME: Suppress this warning if the conversion function ends up being a 3234 // virtual function that overrides a virtual function in a base class. 3235 QualType ClassType 3236 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 3237 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 3238 ConvType = ConvTypeRef->getPointeeType(); 3239 if (ConvType->isRecordType()) { 3240 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 3241 if (ConvType == ClassType) 3242 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 3243 << ClassType; 3244 else if (IsDerivedFrom(ClassType, ConvType)) 3245 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 3246 << ClassType << ConvType; 3247 } else if (ConvType->isVoidType()) { 3248 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 3249 << ClassType << ConvType; 3250 } 3251 3252 if (Conversion->getPrimaryTemplate()) { 3253 // ignore specializations 3254 } else if (Conversion->getPreviousDeclaration()) { 3255 if (FunctionTemplateDecl *ConversionTemplate 3256 = Conversion->getDescribedFunctionTemplate()) { 3257 if (ClassDecl->replaceConversion( 3258 ConversionTemplate->getPreviousDeclaration(), 3259 ConversionTemplate)) 3260 return ConversionTemplate; 3261 } else if (ClassDecl->replaceConversion(Conversion->getPreviousDeclaration(), 3262 Conversion)) 3263 return Conversion; 3264 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 3265 } else if (FunctionTemplateDecl *ConversionTemplate 3266 = Conversion->getDescribedFunctionTemplate()) 3267 ClassDecl->addConversionFunction(ConversionTemplate); 3268 else 3269 ClassDecl->addConversionFunction(Conversion); 3270 3271 return Conversion; 3272} 3273 3274//===----------------------------------------------------------------------===// 3275// Namespace Handling 3276//===----------------------------------------------------------------------===// 3277 3278 3279 3280/// ActOnStartNamespaceDef - This is called at the start of a namespace 3281/// definition. 3282Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 3283 SourceLocation InlineLoc, 3284 SourceLocation IdentLoc, 3285 IdentifierInfo *II, 3286 SourceLocation LBrace, 3287 AttributeList *AttrList) { 3288 // anonymous namespace starts at its left brace 3289 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 3290 (II ? IdentLoc : LBrace) , II); 3291 Namespc->setLBracLoc(LBrace); 3292 Namespc->setInline(InlineLoc.isValid()); 3293 3294 Scope *DeclRegionScope = NamespcScope->getParent(); 3295 3296 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 3297 3298 if (const VisibilityAttr *attr = Namespc->getAttr<VisibilityAttr>()) 3299 PushVisibilityAttr(attr); 3300 3301 if (II) { 3302 // C++ [namespace.def]p2: 3303 // The identifier in an original-namespace-definition shall not have been 3304 // previously defined in the declarative region in which the 3305 // original-namespace-definition appears. The identifier in an 3306 // original-namespace-definition is the name of the namespace. Subsequently 3307 // in that declarative region, it is treated as an original-namespace-name. 3308 3309 NamedDecl *PrevDecl 3310 = LookupSingleName(DeclRegionScope, II, IdentLoc, LookupOrdinaryName, 3311 ForRedeclaration); 3312 3313 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 3314 // This is an extended namespace definition. 3315 if (Namespc->isInline() != OrigNS->isInline()) { 3316 // inline-ness must match 3317 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3318 << Namespc->isInline(); 3319 Diag(OrigNS->getLocation(), diag::note_previous_definition); 3320 Namespc->setInvalidDecl(); 3321 // Recover by ignoring the new namespace's inline status. 3322 Namespc->setInline(OrigNS->isInline()); 3323 } 3324 3325 // Attach this namespace decl to the chain of extended namespace 3326 // definitions. 3327 OrigNS->setNextNamespace(Namespc); 3328 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 3329 3330 // Remove the previous declaration from the scope. 3331 if (DeclRegionScope->isDeclScope(OrigNS)) { 3332 IdResolver.RemoveDecl(OrigNS); 3333 DeclRegionScope->RemoveDecl(OrigNS); 3334 } 3335 } else if (PrevDecl) { 3336 // This is an invalid name redefinition. 3337 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 3338 << Namespc->getDeclName(); 3339 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3340 Namespc->setInvalidDecl(); 3341 // Continue on to push Namespc as current DeclContext and return it. 3342 } else if (II->isStr("std") && 3343 CurContext->getRedeclContext()->isTranslationUnit()) { 3344 // This is the first "real" definition of the namespace "std", so update 3345 // our cache of the "std" namespace to point at this definition. 3346 if (NamespaceDecl *StdNS = getStdNamespace()) { 3347 // We had already defined a dummy namespace "std". Link this new 3348 // namespace definition to the dummy namespace "std". 3349 StdNS->setNextNamespace(Namespc); 3350 StdNS->setLocation(IdentLoc); 3351 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 3352 } 3353 3354 // Make our StdNamespace cache point at the first real definition of the 3355 // "std" namespace. 3356 StdNamespace = Namespc; 3357 } 3358 3359 PushOnScopeChains(Namespc, DeclRegionScope); 3360 } else { 3361 // Anonymous namespaces. 3362 assert(Namespc->isAnonymousNamespace()); 3363 3364 // Link the anonymous namespace into its parent. 3365 NamespaceDecl *PrevDecl; 3366 DeclContext *Parent = CurContext->getRedeclContext(); 3367 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 3368 PrevDecl = TU->getAnonymousNamespace(); 3369 TU->setAnonymousNamespace(Namespc); 3370 } else { 3371 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 3372 PrevDecl = ND->getAnonymousNamespace(); 3373 ND->setAnonymousNamespace(Namespc); 3374 } 3375 3376 // Link the anonymous namespace with its previous declaration. 3377 if (PrevDecl) { 3378 assert(PrevDecl->isAnonymousNamespace()); 3379 assert(!PrevDecl->getNextNamespace()); 3380 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 3381 PrevDecl->setNextNamespace(Namespc); 3382 3383 if (Namespc->isInline() != PrevDecl->isInline()) { 3384 // inline-ness must match 3385 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 3386 << Namespc->isInline(); 3387 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3388 Namespc->setInvalidDecl(); 3389 // Recover by ignoring the new namespace's inline status. 3390 Namespc->setInline(PrevDecl->isInline()); 3391 } 3392 } 3393 3394 CurContext->addDecl(Namespc); 3395 3396 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 3397 // behaves as if it were replaced by 3398 // namespace unique { /* empty body */ } 3399 // using namespace unique; 3400 // namespace unique { namespace-body } 3401 // where all occurrences of 'unique' in a translation unit are 3402 // replaced by the same identifier and this identifier differs 3403 // from all other identifiers in the entire program. 3404 3405 // We just create the namespace with an empty name and then add an 3406 // implicit using declaration, just like the standard suggests. 3407 // 3408 // CodeGen enforces the "universally unique" aspect by giving all 3409 // declarations semantically contained within an anonymous 3410 // namespace internal linkage. 3411 3412 if (!PrevDecl) { 3413 UsingDirectiveDecl* UD 3414 = UsingDirectiveDecl::Create(Context, CurContext, 3415 /* 'using' */ LBrace, 3416 /* 'namespace' */ SourceLocation(), 3417 /* qualifier */ SourceRange(), 3418 /* NNS */ NULL, 3419 /* identifier */ SourceLocation(), 3420 Namespc, 3421 /* Ancestor */ CurContext); 3422 UD->setImplicit(); 3423 CurContext->addDecl(UD); 3424 } 3425 } 3426 3427 // Although we could have an invalid decl (i.e. the namespace name is a 3428 // redefinition), push it as current DeclContext and try to continue parsing. 3429 // FIXME: We should be able to push Namespc here, so that the each DeclContext 3430 // for the namespace has the declarations that showed up in that particular 3431 // namespace definition. 3432 PushDeclContext(NamespcScope, Namespc); 3433 return Namespc; 3434} 3435 3436/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3437/// is a namespace alias, returns the namespace it points to. 3438static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3439 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3440 return AD->getNamespace(); 3441 return dyn_cast_or_null<NamespaceDecl>(D); 3442} 3443 3444/// ActOnFinishNamespaceDef - This callback is called after a namespace is 3445/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 3446void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 3447 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 3448 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 3449 Namespc->setRBracLoc(RBrace); 3450 PopDeclContext(); 3451 if (Namespc->hasAttr<VisibilityAttr>()) 3452 PopPragmaVisibility(); 3453} 3454 3455CXXRecordDecl *Sema::getStdBadAlloc() const { 3456 return cast_or_null<CXXRecordDecl>( 3457 StdBadAlloc.get(Context.getExternalSource())); 3458} 3459 3460NamespaceDecl *Sema::getStdNamespace() const { 3461 return cast_or_null<NamespaceDecl>( 3462 StdNamespace.get(Context.getExternalSource())); 3463} 3464 3465/// \brief Retrieve the special "std" namespace, which may require us to 3466/// implicitly define the namespace. 3467NamespaceDecl *Sema::getOrCreateStdNamespace() { 3468 if (!StdNamespace) { 3469 // The "std" namespace has not yet been defined, so build one implicitly. 3470 StdNamespace = NamespaceDecl::Create(Context, 3471 Context.getTranslationUnitDecl(), 3472 SourceLocation(), 3473 &PP.getIdentifierTable().get("std")); 3474 getStdNamespace()->setImplicit(true); 3475 } 3476 3477 return getStdNamespace(); 3478} 3479 3480Decl *Sema::ActOnUsingDirective(Scope *S, 3481 SourceLocation UsingLoc, 3482 SourceLocation NamespcLoc, 3483 CXXScopeSpec &SS, 3484 SourceLocation IdentLoc, 3485 IdentifierInfo *NamespcName, 3486 AttributeList *AttrList) { 3487 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3488 assert(NamespcName && "Invalid NamespcName."); 3489 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 3490 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3491 3492 UsingDirectiveDecl *UDir = 0; 3493 NestedNameSpecifier *Qualifier = 0; 3494 if (SS.isSet()) 3495 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3496 3497 // Lookup namespace name. 3498 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 3499 LookupParsedName(R, S, &SS); 3500 if (R.isAmbiguous()) 3501 return 0; 3502 3503 if (R.empty()) { 3504 // Allow "using namespace std;" or "using namespace ::std;" even if 3505 // "std" hasn't been defined yet, for GCC compatibility. 3506 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 3507 NamespcName->isStr("std")) { 3508 Diag(IdentLoc, diag::ext_using_undefined_std); 3509 R.addDecl(getOrCreateStdNamespace()); 3510 R.resolveKind(); 3511 } 3512 // Otherwise, attempt typo correction. 3513 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 3514 CTC_NoKeywords, 0)) { 3515 if (R.getAsSingle<NamespaceDecl>() || 3516 R.getAsSingle<NamespaceAliasDecl>()) { 3517 if (DeclContext *DC = computeDeclContext(SS, false)) 3518 Diag(IdentLoc, diag::err_using_directive_member_suggest) 3519 << NamespcName << DC << Corrected << SS.getRange() 3520 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3521 else 3522 Diag(IdentLoc, diag::err_using_directive_suggest) 3523 << NamespcName << Corrected 3524 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 3525 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 3526 << Corrected; 3527 3528 NamespcName = Corrected.getAsIdentifierInfo(); 3529 } else { 3530 R.clear(); 3531 R.setLookupName(NamespcName); 3532 } 3533 } 3534 } 3535 3536 if (!R.empty()) { 3537 NamedDecl *Named = R.getFoundDecl(); 3538 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 3539 && "expected namespace decl"); 3540 // C++ [namespace.udir]p1: 3541 // A using-directive specifies that the names in the nominated 3542 // namespace can be used in the scope in which the 3543 // using-directive appears after the using-directive. During 3544 // unqualified name lookup (3.4.1), the names appear as if they 3545 // were declared in the nearest enclosing namespace which 3546 // contains both the using-directive and the nominated 3547 // namespace. [Note: in this context, "contains" means "contains 3548 // directly or indirectly". ] 3549 3550 // Find enclosing context containing both using-directive and 3551 // nominated namespace. 3552 NamespaceDecl *NS = getNamespaceDecl(Named); 3553 DeclContext *CommonAncestor = cast<DeclContext>(NS); 3554 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 3555 CommonAncestor = CommonAncestor->getParent(); 3556 3557 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 3558 SS.getRange(), 3559 (NestedNameSpecifier *)SS.getScopeRep(), 3560 IdentLoc, Named, CommonAncestor); 3561 PushUsingDirective(S, UDir); 3562 } else { 3563 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 3564 } 3565 3566 // FIXME: We ignore attributes for now. 3567 delete AttrList; 3568 return UDir; 3569} 3570 3571void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 3572 // If scope has associated entity, then using directive is at namespace 3573 // or translation unit scope. We add UsingDirectiveDecls, into 3574 // it's lookup structure. 3575 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 3576 Ctx->addDecl(UDir); 3577 else 3578 // Otherwise it is block-sope. using-directives will affect lookup 3579 // only to the end of scope. 3580 S->PushUsingDirective(UDir); 3581} 3582 3583 3584Decl *Sema::ActOnUsingDeclaration(Scope *S, 3585 AccessSpecifier AS, 3586 bool HasUsingKeyword, 3587 SourceLocation UsingLoc, 3588 CXXScopeSpec &SS, 3589 UnqualifiedId &Name, 3590 AttributeList *AttrList, 3591 bool IsTypeName, 3592 SourceLocation TypenameLoc) { 3593 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 3594 3595 switch (Name.getKind()) { 3596 case UnqualifiedId::IK_Identifier: 3597 case UnqualifiedId::IK_OperatorFunctionId: 3598 case UnqualifiedId::IK_LiteralOperatorId: 3599 case UnqualifiedId::IK_ConversionFunctionId: 3600 break; 3601 3602 case UnqualifiedId::IK_ConstructorName: 3603 case UnqualifiedId::IK_ConstructorTemplateId: 3604 // C++0x inherited constructors. 3605 if (getLangOptions().CPlusPlus0x) break; 3606 3607 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 3608 << SS.getRange(); 3609 return 0; 3610 3611 case UnqualifiedId::IK_DestructorName: 3612 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 3613 << SS.getRange(); 3614 return 0; 3615 3616 case UnqualifiedId::IK_TemplateId: 3617 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 3618 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 3619 return 0; 3620 } 3621 3622 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 3623 DeclarationName TargetName = TargetNameInfo.getName(); 3624 if (!TargetName) 3625 return 0; 3626 3627 // Warn about using declarations. 3628 // TODO: store that the declaration was written without 'using' and 3629 // talk about access decls instead of using decls in the 3630 // diagnostics. 3631 if (!HasUsingKeyword) { 3632 UsingLoc = Name.getSourceRange().getBegin(); 3633 3634 Diag(UsingLoc, diag::warn_access_decl_deprecated) 3635 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 3636 } 3637 3638 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 3639 TargetNameInfo, AttrList, 3640 /* IsInstantiation */ false, 3641 IsTypeName, TypenameLoc); 3642 if (UD) 3643 PushOnScopeChains(UD, S, /*AddToContext*/ false); 3644 3645 return UD; 3646} 3647 3648/// \brief Determine whether a using declaration considers the given 3649/// declarations as "equivalent", e.g., if they are redeclarations of 3650/// the same entity or are both typedefs of the same type. 3651static bool 3652IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 3653 bool &SuppressRedeclaration) { 3654 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 3655 SuppressRedeclaration = false; 3656 return true; 3657 } 3658 3659 if (TypedefDecl *TD1 = dyn_cast<TypedefDecl>(D1)) 3660 if (TypedefDecl *TD2 = dyn_cast<TypedefDecl>(D2)) { 3661 SuppressRedeclaration = true; 3662 return Context.hasSameType(TD1->getUnderlyingType(), 3663 TD2->getUnderlyingType()); 3664 } 3665 3666 return false; 3667} 3668 3669 3670/// Determines whether to create a using shadow decl for a particular 3671/// decl, given the set of decls existing prior to this using lookup. 3672bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 3673 const LookupResult &Previous) { 3674 // Diagnose finding a decl which is not from a base class of the 3675 // current class. We do this now because there are cases where this 3676 // function will silently decide not to build a shadow decl, which 3677 // will pre-empt further diagnostics. 3678 // 3679 // We don't need to do this in C++0x because we do the check once on 3680 // the qualifier. 3681 // 3682 // FIXME: diagnose the following if we care enough: 3683 // struct A { int foo; }; 3684 // struct B : A { using A::foo; }; 3685 // template <class T> struct C : A {}; 3686 // template <class T> struct D : C<T> { using B::foo; } // <--- 3687 // This is invalid (during instantiation) in C++03 because B::foo 3688 // resolves to the using decl in B, which is not a base class of D<T>. 3689 // We can't diagnose it immediately because C<T> is an unknown 3690 // specialization. The UsingShadowDecl in D<T> then points directly 3691 // to A::foo, which will look well-formed when we instantiate. 3692 // The right solution is to not collapse the shadow-decl chain. 3693 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 3694 DeclContext *OrigDC = Orig->getDeclContext(); 3695 3696 // Handle enums and anonymous structs. 3697 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 3698 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 3699 while (OrigRec->isAnonymousStructOrUnion()) 3700 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 3701 3702 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 3703 if (OrigDC == CurContext) { 3704 Diag(Using->getLocation(), 3705 diag::err_using_decl_nested_name_specifier_is_current_class) 3706 << Using->getNestedNameRange(); 3707 Diag(Orig->getLocation(), diag::note_using_decl_target); 3708 return true; 3709 } 3710 3711 Diag(Using->getNestedNameRange().getBegin(), 3712 diag::err_using_decl_nested_name_specifier_is_not_base_class) 3713 << Using->getTargetNestedNameDecl() 3714 << cast<CXXRecordDecl>(CurContext) 3715 << Using->getNestedNameRange(); 3716 Diag(Orig->getLocation(), diag::note_using_decl_target); 3717 return true; 3718 } 3719 } 3720 3721 if (Previous.empty()) return false; 3722 3723 NamedDecl *Target = Orig; 3724 if (isa<UsingShadowDecl>(Target)) 3725 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3726 3727 // If the target happens to be one of the previous declarations, we 3728 // don't have a conflict. 3729 // 3730 // FIXME: but we might be increasing its access, in which case we 3731 // should redeclare it. 3732 NamedDecl *NonTag = 0, *Tag = 0; 3733 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 3734 I != E; ++I) { 3735 NamedDecl *D = (*I)->getUnderlyingDecl(); 3736 bool Result; 3737 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 3738 return Result; 3739 3740 (isa<TagDecl>(D) ? Tag : NonTag) = D; 3741 } 3742 3743 if (Target->isFunctionOrFunctionTemplate()) { 3744 FunctionDecl *FD; 3745 if (isa<FunctionTemplateDecl>(Target)) 3746 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 3747 else 3748 FD = cast<FunctionDecl>(Target); 3749 3750 NamedDecl *OldDecl = 0; 3751 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 3752 case Ovl_Overload: 3753 return false; 3754 3755 case Ovl_NonFunction: 3756 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3757 break; 3758 3759 // We found a decl with the exact signature. 3760 case Ovl_Match: 3761 // If we're in a record, we want to hide the target, so we 3762 // return true (without a diagnostic) to tell the caller not to 3763 // build a shadow decl. 3764 if (CurContext->isRecord()) 3765 return true; 3766 3767 // If we're not in a record, this is an error. 3768 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3769 break; 3770 } 3771 3772 Diag(Target->getLocation(), diag::note_using_decl_target); 3773 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 3774 return true; 3775 } 3776 3777 // Target is not a function. 3778 3779 if (isa<TagDecl>(Target)) { 3780 // No conflict between a tag and a non-tag. 3781 if (!Tag) return false; 3782 3783 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3784 Diag(Target->getLocation(), diag::note_using_decl_target); 3785 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 3786 return true; 3787 } 3788 3789 // No conflict between a tag and a non-tag. 3790 if (!NonTag) return false; 3791 3792 Diag(Using->getLocation(), diag::err_using_decl_conflict); 3793 Diag(Target->getLocation(), diag::note_using_decl_target); 3794 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 3795 return true; 3796} 3797 3798/// Builds a shadow declaration corresponding to a 'using' declaration. 3799UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 3800 UsingDecl *UD, 3801 NamedDecl *Orig) { 3802 3803 // If we resolved to another shadow declaration, just coalesce them. 3804 NamedDecl *Target = Orig; 3805 if (isa<UsingShadowDecl>(Target)) { 3806 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 3807 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 3808 } 3809 3810 UsingShadowDecl *Shadow 3811 = UsingShadowDecl::Create(Context, CurContext, 3812 UD->getLocation(), UD, Target); 3813 UD->addShadowDecl(Shadow); 3814 3815 if (S) 3816 PushOnScopeChains(Shadow, S); 3817 else 3818 CurContext->addDecl(Shadow); 3819 Shadow->setAccess(UD->getAccess()); 3820 3821 // Register it as a conversion if appropriate. 3822 if (Shadow->getDeclName().getNameKind() 3823 == DeclarationName::CXXConversionFunctionName) 3824 cast<CXXRecordDecl>(CurContext)->addConversionFunction(Shadow); 3825 3826 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 3827 Shadow->setInvalidDecl(); 3828 3829 return Shadow; 3830} 3831 3832/// Hides a using shadow declaration. This is required by the current 3833/// using-decl implementation when a resolvable using declaration in a 3834/// class is followed by a declaration which would hide or override 3835/// one or more of the using decl's targets; for example: 3836/// 3837/// struct Base { void foo(int); }; 3838/// struct Derived : Base { 3839/// using Base::foo; 3840/// void foo(int); 3841/// }; 3842/// 3843/// The governing language is C++03 [namespace.udecl]p12: 3844/// 3845/// When a using-declaration brings names from a base class into a 3846/// derived class scope, member functions in the derived class 3847/// override and/or hide member functions with the same name and 3848/// parameter types in a base class (rather than conflicting). 3849/// 3850/// There are two ways to implement this: 3851/// (1) optimistically create shadow decls when they're not hidden 3852/// by existing declarations, or 3853/// (2) don't create any shadow decls (or at least don't make them 3854/// visible) until we've fully parsed/instantiated the class. 3855/// The problem with (1) is that we might have to retroactively remove 3856/// a shadow decl, which requires several O(n) operations because the 3857/// decl structures are (very reasonably) not designed for removal. 3858/// (2) avoids this but is very fiddly and phase-dependent. 3859void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 3860 if (Shadow->getDeclName().getNameKind() == 3861 DeclarationName::CXXConversionFunctionName) 3862 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 3863 3864 // Remove it from the DeclContext... 3865 Shadow->getDeclContext()->removeDecl(Shadow); 3866 3867 // ...and the scope, if applicable... 3868 if (S) { 3869 S->RemoveDecl(Shadow); 3870 IdResolver.RemoveDecl(Shadow); 3871 } 3872 3873 // ...and the using decl. 3874 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 3875 3876 // TODO: complain somehow if Shadow was used. It shouldn't 3877 // be possible for this to happen, because...? 3878} 3879 3880/// Builds a using declaration. 3881/// 3882/// \param IsInstantiation - Whether this call arises from an 3883/// instantiation of an unresolved using declaration. We treat 3884/// the lookup differently for these declarations. 3885NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 3886 SourceLocation UsingLoc, 3887 CXXScopeSpec &SS, 3888 const DeclarationNameInfo &NameInfo, 3889 AttributeList *AttrList, 3890 bool IsInstantiation, 3891 bool IsTypeName, 3892 SourceLocation TypenameLoc) { 3893 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 3894 SourceLocation IdentLoc = NameInfo.getLoc(); 3895 assert(IdentLoc.isValid() && "Invalid TargetName location."); 3896 3897 // FIXME: We ignore attributes for now. 3898 delete AttrList; 3899 3900 if (SS.isEmpty()) { 3901 Diag(IdentLoc, diag::err_using_requires_qualname); 3902 return 0; 3903 } 3904 3905 // Do the redeclaration lookup in the current scope. 3906 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 3907 ForRedeclaration); 3908 Previous.setHideTags(false); 3909 if (S) { 3910 LookupName(Previous, S); 3911 3912 // It is really dumb that we have to do this. 3913 LookupResult::Filter F = Previous.makeFilter(); 3914 while (F.hasNext()) { 3915 NamedDecl *D = F.next(); 3916 if (!isDeclInScope(D, CurContext, S)) 3917 F.erase(); 3918 } 3919 F.done(); 3920 } else { 3921 assert(IsInstantiation && "no scope in non-instantiation"); 3922 assert(CurContext->isRecord() && "scope not record in instantiation"); 3923 LookupQualifiedName(Previous, CurContext); 3924 } 3925 3926 NestedNameSpecifier *NNS = 3927 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3928 3929 // Check for invalid redeclarations. 3930 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 3931 return 0; 3932 3933 // Check for bad qualifiers. 3934 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 3935 return 0; 3936 3937 DeclContext *LookupContext = computeDeclContext(SS); 3938 NamedDecl *D; 3939 if (!LookupContext) { 3940 if (IsTypeName) { 3941 // FIXME: not all declaration name kinds are legal here 3942 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 3943 UsingLoc, TypenameLoc, 3944 SS.getRange(), NNS, 3945 IdentLoc, NameInfo.getName()); 3946 } else { 3947 D = UnresolvedUsingValueDecl::Create(Context, CurContext, 3948 UsingLoc, SS.getRange(), 3949 NNS, NameInfo); 3950 } 3951 } else { 3952 D = UsingDecl::Create(Context, CurContext, 3953 SS.getRange(), UsingLoc, NNS, NameInfo, 3954 IsTypeName); 3955 } 3956 D->setAccess(AS); 3957 CurContext->addDecl(D); 3958 3959 if (!LookupContext) return D; 3960 UsingDecl *UD = cast<UsingDecl>(D); 3961 3962 if (RequireCompleteDeclContext(SS, LookupContext)) { 3963 UD->setInvalidDecl(); 3964 return UD; 3965 } 3966 3967 // Look up the target name. 3968 3969 LookupResult R(*this, NameInfo, LookupOrdinaryName); 3970 3971 // Unlike most lookups, we don't always want to hide tag 3972 // declarations: tag names are visible through the using declaration 3973 // even if hidden by ordinary names, *except* in a dependent context 3974 // where it's important for the sanity of two-phase lookup. 3975 if (!IsInstantiation) 3976 R.setHideTags(false); 3977 3978 LookupQualifiedName(R, LookupContext); 3979 3980 if (R.empty()) { 3981 Diag(IdentLoc, diag::err_no_member) 3982 << NameInfo.getName() << LookupContext << SS.getRange(); 3983 UD->setInvalidDecl(); 3984 return UD; 3985 } 3986 3987 if (R.isAmbiguous()) { 3988 UD->setInvalidDecl(); 3989 return UD; 3990 } 3991 3992 if (IsTypeName) { 3993 // If we asked for a typename and got a non-type decl, error out. 3994 if (!R.getAsSingle<TypeDecl>()) { 3995 Diag(IdentLoc, diag::err_using_typename_non_type); 3996 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3997 Diag((*I)->getUnderlyingDecl()->getLocation(), 3998 diag::note_using_decl_target); 3999 UD->setInvalidDecl(); 4000 return UD; 4001 } 4002 } else { 4003 // If we asked for a non-typename and we got a type, error out, 4004 // but only if this is an instantiation of an unresolved using 4005 // decl. Otherwise just silently find the type name. 4006 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 4007 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 4008 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 4009 UD->setInvalidDecl(); 4010 return UD; 4011 } 4012 } 4013 4014 // C++0x N2914 [namespace.udecl]p6: 4015 // A using-declaration shall not name a namespace. 4016 if (R.getAsSingle<NamespaceDecl>()) { 4017 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 4018 << SS.getRange(); 4019 UD->setInvalidDecl(); 4020 return UD; 4021 } 4022 4023 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 4024 if (!CheckUsingShadowDecl(UD, *I, Previous)) 4025 BuildUsingShadowDecl(S, UD, *I); 4026 } 4027 4028 return UD; 4029} 4030 4031/// Checks that the given using declaration is not an invalid 4032/// redeclaration. Note that this is checking only for the using decl 4033/// itself, not for any ill-formedness among the UsingShadowDecls. 4034bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 4035 bool isTypeName, 4036 const CXXScopeSpec &SS, 4037 SourceLocation NameLoc, 4038 const LookupResult &Prev) { 4039 // C++03 [namespace.udecl]p8: 4040 // C++0x [namespace.udecl]p10: 4041 // A using-declaration is a declaration and can therefore be used 4042 // repeatedly where (and only where) multiple declarations are 4043 // allowed. 4044 // 4045 // That's in non-member contexts. 4046 if (!CurContext->getRedeclContext()->isRecord()) 4047 return false; 4048 4049 NestedNameSpecifier *Qual 4050 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4051 4052 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 4053 NamedDecl *D = *I; 4054 4055 bool DTypename; 4056 NestedNameSpecifier *DQual; 4057 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 4058 DTypename = UD->isTypeName(); 4059 DQual = UD->getTargetNestedNameDecl(); 4060 } else if (UnresolvedUsingValueDecl *UD 4061 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 4062 DTypename = false; 4063 DQual = UD->getTargetNestedNameSpecifier(); 4064 } else if (UnresolvedUsingTypenameDecl *UD 4065 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 4066 DTypename = true; 4067 DQual = UD->getTargetNestedNameSpecifier(); 4068 } else continue; 4069 4070 // using decls differ if one says 'typename' and the other doesn't. 4071 // FIXME: non-dependent using decls? 4072 if (isTypeName != DTypename) continue; 4073 4074 // using decls differ if they name different scopes (but note that 4075 // template instantiation can cause this check to trigger when it 4076 // didn't before instantiation). 4077 if (Context.getCanonicalNestedNameSpecifier(Qual) != 4078 Context.getCanonicalNestedNameSpecifier(DQual)) 4079 continue; 4080 4081 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 4082 Diag(D->getLocation(), diag::note_using_decl) << 1; 4083 return true; 4084 } 4085 4086 return false; 4087} 4088 4089 4090/// Checks that the given nested-name qualifier used in a using decl 4091/// in the current context is appropriately related to the current 4092/// scope. If an error is found, diagnoses it and returns true. 4093bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 4094 const CXXScopeSpec &SS, 4095 SourceLocation NameLoc) { 4096 DeclContext *NamedContext = computeDeclContext(SS); 4097 4098 if (!CurContext->isRecord()) { 4099 // C++03 [namespace.udecl]p3: 4100 // C++0x [namespace.udecl]p8: 4101 // A using-declaration for a class member shall be a member-declaration. 4102 4103 // If we weren't able to compute a valid scope, it must be a 4104 // dependent class scope. 4105 if (!NamedContext || NamedContext->isRecord()) { 4106 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 4107 << SS.getRange(); 4108 return true; 4109 } 4110 4111 // Otherwise, everything is known to be fine. 4112 return false; 4113 } 4114 4115 // The current scope is a record. 4116 4117 // If the named context is dependent, we can't decide much. 4118 if (!NamedContext) { 4119 // FIXME: in C++0x, we can diagnose if we can prove that the 4120 // nested-name-specifier does not refer to a base class, which is 4121 // still possible in some cases. 4122 4123 // Otherwise we have to conservatively report that things might be 4124 // okay. 4125 return false; 4126 } 4127 4128 if (!NamedContext->isRecord()) { 4129 // Ideally this would point at the last name in the specifier, 4130 // but we don't have that level of source info. 4131 Diag(SS.getRange().getBegin(), 4132 diag::err_using_decl_nested_name_specifier_is_not_class) 4133 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 4134 return true; 4135 } 4136 4137 if (getLangOptions().CPlusPlus0x) { 4138 // C++0x [namespace.udecl]p3: 4139 // In a using-declaration used as a member-declaration, the 4140 // nested-name-specifier shall name a base class of the class 4141 // being defined. 4142 4143 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 4144 cast<CXXRecordDecl>(NamedContext))) { 4145 if (CurContext == NamedContext) { 4146 Diag(NameLoc, 4147 diag::err_using_decl_nested_name_specifier_is_current_class) 4148 << SS.getRange(); 4149 return true; 4150 } 4151 4152 Diag(SS.getRange().getBegin(), 4153 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4154 << (NestedNameSpecifier*) SS.getScopeRep() 4155 << cast<CXXRecordDecl>(CurContext) 4156 << SS.getRange(); 4157 return true; 4158 } 4159 4160 return false; 4161 } 4162 4163 // C++03 [namespace.udecl]p4: 4164 // A using-declaration used as a member-declaration shall refer 4165 // to a member of a base class of the class being defined [etc.]. 4166 4167 // Salient point: SS doesn't have to name a base class as long as 4168 // lookup only finds members from base classes. Therefore we can 4169 // diagnose here only if we can prove that that can't happen, 4170 // i.e. if the class hierarchies provably don't intersect. 4171 4172 // TODO: it would be nice if "definitely valid" results were cached 4173 // in the UsingDecl and UsingShadowDecl so that these checks didn't 4174 // need to be repeated. 4175 4176 struct UserData { 4177 llvm::DenseSet<const CXXRecordDecl*> Bases; 4178 4179 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 4180 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4181 Data->Bases.insert(Base); 4182 return true; 4183 } 4184 4185 bool hasDependentBases(const CXXRecordDecl *Class) { 4186 return !Class->forallBases(collect, this); 4187 } 4188 4189 /// Returns true if the base is dependent or is one of the 4190 /// accumulated base classes. 4191 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 4192 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 4193 return !Data->Bases.count(Base); 4194 } 4195 4196 bool mightShareBases(const CXXRecordDecl *Class) { 4197 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 4198 } 4199 }; 4200 4201 UserData Data; 4202 4203 // Returns false if we find a dependent base. 4204 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 4205 return false; 4206 4207 // Returns false if the class has a dependent base or if it or one 4208 // of its bases is present in the base set of the current context. 4209 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 4210 return false; 4211 4212 Diag(SS.getRange().getBegin(), 4213 diag::err_using_decl_nested_name_specifier_is_not_base_class) 4214 << (NestedNameSpecifier*) SS.getScopeRep() 4215 << cast<CXXRecordDecl>(CurContext) 4216 << SS.getRange(); 4217 4218 return true; 4219} 4220 4221Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 4222 SourceLocation NamespaceLoc, 4223 SourceLocation AliasLoc, 4224 IdentifierInfo *Alias, 4225 CXXScopeSpec &SS, 4226 SourceLocation IdentLoc, 4227 IdentifierInfo *Ident) { 4228 4229 // Lookup the namespace name. 4230 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 4231 LookupParsedName(R, S, &SS); 4232 4233 // Check if we have a previous declaration with the same name. 4234 NamedDecl *PrevDecl 4235 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 4236 ForRedeclaration); 4237 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 4238 PrevDecl = 0; 4239 4240 if (PrevDecl) { 4241 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 4242 // We already have an alias with the same name that points to the same 4243 // namespace, so don't create a new one. 4244 // FIXME: At some point, we'll want to create the (redundant) 4245 // declaration to maintain better source information. 4246 if (!R.isAmbiguous() && !R.empty() && 4247 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 4248 return 0; 4249 } 4250 4251 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 4252 diag::err_redefinition_different_kind; 4253 Diag(AliasLoc, DiagID) << Alias; 4254 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4255 return 0; 4256 } 4257 4258 if (R.isAmbiguous()) 4259 return 0; 4260 4261 if (R.empty()) { 4262 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4263 CTC_NoKeywords, 0)) { 4264 if (R.getAsSingle<NamespaceDecl>() || 4265 R.getAsSingle<NamespaceAliasDecl>()) { 4266 if (DeclContext *DC = computeDeclContext(SS, false)) 4267 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4268 << Ident << DC << Corrected << SS.getRange() 4269 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4270 else 4271 Diag(IdentLoc, diag::err_using_directive_suggest) 4272 << Ident << Corrected 4273 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4274 4275 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4276 << Corrected; 4277 4278 Ident = Corrected.getAsIdentifierInfo(); 4279 } else { 4280 R.clear(); 4281 R.setLookupName(Ident); 4282 } 4283 } 4284 4285 if (R.empty()) { 4286 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 4287 return 0; 4288 } 4289 } 4290 4291 NamespaceAliasDecl *AliasDecl = 4292 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 4293 Alias, SS.getRange(), 4294 (NestedNameSpecifier *)SS.getScopeRep(), 4295 IdentLoc, R.getFoundDecl()); 4296 4297 PushOnScopeChains(AliasDecl, S); 4298 return AliasDecl; 4299} 4300 4301namespace { 4302 /// \brief Scoped object used to handle the state changes required in Sema 4303 /// to implicitly define the body of a C++ member function; 4304 class ImplicitlyDefinedFunctionScope { 4305 Sema &S; 4306 DeclContext *PreviousContext; 4307 4308 public: 4309 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 4310 : S(S), PreviousContext(S.CurContext) 4311 { 4312 S.CurContext = Method; 4313 S.PushFunctionScope(); 4314 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 4315 } 4316 4317 ~ImplicitlyDefinedFunctionScope() { 4318 S.PopExpressionEvaluationContext(); 4319 S.PopFunctionOrBlockScope(); 4320 S.CurContext = PreviousContext; 4321 } 4322 }; 4323} 4324 4325CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 4326 CXXRecordDecl *ClassDecl) { 4327 // C++ [class.ctor]p5: 4328 // A default constructor for a class X is a constructor of class X 4329 // that can be called without an argument. If there is no 4330 // user-declared constructor for class X, a default constructor is 4331 // implicitly declared. An implicitly-declared default constructor 4332 // is an inline public member of its class. 4333 assert(!ClassDecl->hasUserDeclaredConstructor() && 4334 "Should not build implicit default constructor!"); 4335 4336 // C++ [except.spec]p14: 4337 // An implicitly declared special member function (Clause 12) shall have an 4338 // exception-specification. [...] 4339 ImplicitExceptionSpecification ExceptSpec(Context); 4340 4341 // Direct base-class destructors. 4342 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4343 BEnd = ClassDecl->bases_end(); 4344 B != BEnd; ++B) { 4345 if (B->isVirtual()) // Handled below. 4346 continue; 4347 4348 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4349 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4350 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4351 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4352 else if (CXXConstructorDecl *Constructor 4353 = BaseClassDecl->getDefaultConstructor()) 4354 ExceptSpec.CalledDecl(Constructor); 4355 } 4356 } 4357 4358 // Virtual base-class destructors. 4359 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4360 BEnd = ClassDecl->vbases_end(); 4361 B != BEnd; ++B) { 4362 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 4363 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4364 if (!BaseClassDecl->hasDeclaredDefaultConstructor()) 4365 ExceptSpec.CalledDecl(DeclareImplicitDefaultConstructor(BaseClassDecl)); 4366 else if (CXXConstructorDecl *Constructor 4367 = BaseClassDecl->getDefaultConstructor()) 4368 ExceptSpec.CalledDecl(Constructor); 4369 } 4370 } 4371 4372 // Field destructors. 4373 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4374 FEnd = ClassDecl->field_end(); 4375 F != FEnd; ++F) { 4376 if (const RecordType *RecordTy 4377 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4378 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4379 if (!FieldClassDecl->hasDeclaredDefaultConstructor()) 4380 ExceptSpec.CalledDecl( 4381 DeclareImplicitDefaultConstructor(FieldClassDecl)); 4382 else if (CXXConstructorDecl *Constructor 4383 = FieldClassDecl->getDefaultConstructor()) 4384 ExceptSpec.CalledDecl(Constructor); 4385 } 4386 } 4387 4388 4389 // Create the actual constructor declaration. 4390 CanQualType ClassType 4391 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4392 DeclarationName Name 4393 = Context.DeclarationNames.getCXXConstructorName(ClassType); 4394 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4395 CXXConstructorDecl *DefaultCon 4396 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 4397 Context.getFunctionType(Context.VoidTy, 4398 0, 0, false, 0, 4399 ExceptSpec.hasExceptionSpecification(), 4400 ExceptSpec.hasAnyExceptionSpecification(), 4401 ExceptSpec.size(), 4402 ExceptSpec.data(), 4403 FunctionType::ExtInfo()), 4404 /*TInfo=*/0, 4405 /*isExplicit=*/false, 4406 /*isInline=*/true, 4407 /*isImplicitlyDeclared=*/true); 4408 DefaultCon->setAccess(AS_public); 4409 DefaultCon->setImplicit(); 4410 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 4411 4412 // Note that we have declared this constructor. 4413 ClassDecl->setDeclaredDefaultConstructor(true); 4414 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 4415 4416 if (Scope *S = getScopeForContext(ClassDecl)) 4417 PushOnScopeChains(DefaultCon, S, false); 4418 ClassDecl->addDecl(DefaultCon); 4419 4420 return DefaultCon; 4421} 4422 4423void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 4424 CXXConstructorDecl *Constructor) { 4425 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 4426 !Constructor->isUsed(false)) && 4427 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 4428 4429 CXXRecordDecl *ClassDecl = Constructor->getParent(); 4430 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 4431 4432 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 4433 ErrorTrap Trap(*this); 4434 if (SetBaseOrMemberInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 4435 Trap.hasErrorOccurred()) { 4436 Diag(CurrentLocation, diag::note_member_synthesized_at) 4437 << CXXConstructor << Context.getTagDeclType(ClassDecl); 4438 Constructor->setInvalidDecl(); 4439 } else { 4440 Constructor->setUsed(); 4441 MarkVTableUsed(CurrentLocation, ClassDecl); 4442 } 4443} 4444 4445CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 4446 // C++ [class.dtor]p2: 4447 // If a class has no user-declared destructor, a destructor is 4448 // declared implicitly. An implicitly-declared destructor is an 4449 // inline public member of its class. 4450 4451 // C++ [except.spec]p14: 4452 // An implicitly declared special member function (Clause 12) shall have 4453 // an exception-specification. 4454 ImplicitExceptionSpecification ExceptSpec(Context); 4455 4456 // Direct base-class destructors. 4457 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4458 BEnd = ClassDecl->bases_end(); 4459 B != BEnd; ++B) { 4460 if (B->isVirtual()) // Handled below. 4461 continue; 4462 4463 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4464 ExceptSpec.CalledDecl( 4465 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4466 } 4467 4468 // Virtual base-class destructors. 4469 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 4470 BEnd = ClassDecl->vbases_end(); 4471 B != BEnd; ++B) { 4472 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 4473 ExceptSpec.CalledDecl( 4474 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 4475 } 4476 4477 // Field destructors. 4478 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4479 FEnd = ClassDecl->field_end(); 4480 F != FEnd; ++F) { 4481 if (const RecordType *RecordTy 4482 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 4483 ExceptSpec.CalledDecl( 4484 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 4485 } 4486 4487 // Create the actual destructor declaration. 4488 QualType Ty = Context.getFunctionType(Context.VoidTy, 4489 0, 0, false, 0, 4490 ExceptSpec.hasExceptionSpecification(), 4491 ExceptSpec.hasAnyExceptionSpecification(), 4492 ExceptSpec.size(), 4493 ExceptSpec.data(), 4494 FunctionType::ExtInfo()); 4495 4496 CanQualType ClassType 4497 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4498 DeclarationName Name 4499 = Context.DeclarationNames.getCXXDestructorName(ClassType); 4500 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4501 CXXDestructorDecl *Destructor 4502 = CXXDestructorDecl::Create(Context, ClassDecl, NameInfo, Ty, 4503 /*isInline=*/true, 4504 /*isImplicitlyDeclared=*/true); 4505 Destructor->setAccess(AS_public); 4506 Destructor->setImplicit(); 4507 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 4508 4509 // Note that we have declared this destructor. 4510 ClassDecl->setDeclaredDestructor(true); 4511 ++ASTContext::NumImplicitDestructorsDeclared; 4512 4513 // Introduce this destructor into its scope. 4514 if (Scope *S = getScopeForContext(ClassDecl)) 4515 PushOnScopeChains(Destructor, S, false); 4516 ClassDecl->addDecl(Destructor); 4517 4518 // This could be uniqued if it ever proves significant. 4519 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 4520 4521 AddOverriddenMethods(ClassDecl, Destructor); 4522 4523 return Destructor; 4524} 4525 4526void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 4527 CXXDestructorDecl *Destructor) { 4528 assert((Destructor->isImplicit() && !Destructor->isUsed(false)) && 4529 "DefineImplicitDestructor - call it for implicit default dtor"); 4530 CXXRecordDecl *ClassDecl = Destructor->getParent(); 4531 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 4532 4533 if (Destructor->isInvalidDecl()) 4534 return; 4535 4536 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 4537 4538 ErrorTrap Trap(*this); 4539 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4540 Destructor->getParent()); 4541 4542 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 4543 Diag(CurrentLocation, diag::note_member_synthesized_at) 4544 << CXXDestructor << Context.getTagDeclType(ClassDecl); 4545 4546 Destructor->setInvalidDecl(); 4547 return; 4548 } 4549 4550 Destructor->setUsed(); 4551 MarkVTableUsed(CurrentLocation, ClassDecl); 4552} 4553 4554/// \brief Builds a statement that copies the given entity from \p From to 4555/// \c To. 4556/// 4557/// This routine is used to copy the members of a class with an 4558/// implicitly-declared copy assignment operator. When the entities being 4559/// copied are arrays, this routine builds for loops to copy them. 4560/// 4561/// \param S The Sema object used for type-checking. 4562/// 4563/// \param Loc The location where the implicit copy is being generated. 4564/// 4565/// \param T The type of the expressions being copied. Both expressions must 4566/// have this type. 4567/// 4568/// \param To The expression we are copying to. 4569/// 4570/// \param From The expression we are copying from. 4571/// 4572/// \param CopyingBaseSubobject Whether we're copying a base subobject. 4573/// Otherwise, it's a non-static member subobject. 4574/// 4575/// \param Depth Internal parameter recording the depth of the recursion. 4576/// 4577/// \returns A statement or a loop that copies the expressions. 4578static StmtResult 4579BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 4580 Expr *To, Expr *From, 4581 bool CopyingBaseSubobject, unsigned Depth = 0) { 4582 // C++0x [class.copy]p30: 4583 // Each subobject is assigned in the manner appropriate to its type: 4584 // 4585 // - if the subobject is of class type, the copy assignment operator 4586 // for the class is used (as if by explicit qualification; that is, 4587 // ignoring any possible virtual overriding functions in more derived 4588 // classes); 4589 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 4590 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4591 4592 // Look for operator=. 4593 DeclarationName Name 4594 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4595 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 4596 S.LookupQualifiedName(OpLookup, ClassDecl, false); 4597 4598 // Filter out any result that isn't a copy-assignment operator. 4599 LookupResult::Filter F = OpLookup.makeFilter(); 4600 while (F.hasNext()) { 4601 NamedDecl *D = F.next(); 4602 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 4603 if (Method->isCopyAssignmentOperator()) 4604 continue; 4605 4606 F.erase(); 4607 } 4608 F.done(); 4609 4610 // Suppress the protected check (C++ [class.protected]) for each of the 4611 // assignment operators we found. This strange dance is required when 4612 // we're assigning via a base classes's copy-assignment operator. To 4613 // ensure that we're getting the right base class subobject (without 4614 // ambiguities), we need to cast "this" to that subobject type; to 4615 // ensure that we don't go through the virtual call mechanism, we need 4616 // to qualify the operator= name with the base class (see below). However, 4617 // this means that if the base class has a protected copy assignment 4618 // operator, the protected member access check will fail. So, we 4619 // rewrite "protected" access to "public" access in this case, since we 4620 // know by construction that we're calling from a derived class. 4621 if (CopyingBaseSubobject) { 4622 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 4623 L != LEnd; ++L) { 4624 if (L.getAccess() == AS_protected) 4625 L.setAccess(AS_public); 4626 } 4627 } 4628 4629 // Create the nested-name-specifier that will be used to qualify the 4630 // reference to operator=; this is required to suppress the virtual 4631 // call mechanism. 4632 CXXScopeSpec SS; 4633 SS.setRange(Loc); 4634 SS.setScopeRep(NestedNameSpecifier::Create(S.Context, 0, false, 4635 T.getTypePtr())); 4636 4637 // Create the reference to operator=. 4638 ExprResult OpEqualRef 4639 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 4640 /*FirstQualifierInScope=*/0, OpLookup, 4641 /*TemplateArgs=*/0, 4642 /*SuppressQualifierCheck=*/true); 4643 if (OpEqualRef.isInvalid()) 4644 return StmtError(); 4645 4646 // Build the call to the assignment operator. 4647 4648 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 4649 OpEqualRef.takeAs<Expr>(), 4650 Loc, &From, 1, 0, Loc); 4651 if (Call.isInvalid()) 4652 return StmtError(); 4653 4654 return S.Owned(Call.takeAs<Stmt>()); 4655 } 4656 4657 // - if the subobject is of scalar type, the built-in assignment 4658 // operator is used. 4659 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 4660 if (!ArrayTy) { 4661 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 4662 if (Assignment.isInvalid()) 4663 return StmtError(); 4664 4665 return S.Owned(Assignment.takeAs<Stmt>()); 4666 } 4667 4668 // - if the subobject is an array, each element is assigned, in the 4669 // manner appropriate to the element type; 4670 4671 // Construct a loop over the array bounds, e.g., 4672 // 4673 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 4674 // 4675 // that will copy each of the array elements. 4676 QualType SizeType = S.Context.getSizeType(); 4677 4678 // Create the iteration variable. 4679 IdentifierInfo *IterationVarName = 0; 4680 { 4681 llvm::SmallString<8> Str; 4682 llvm::raw_svector_ostream OS(Str); 4683 OS << "__i" << Depth; 4684 IterationVarName = &S.Context.Idents.get(OS.str()); 4685 } 4686 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, 4687 IterationVarName, SizeType, 4688 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 4689 SC_None, SC_None); 4690 4691 // Initialize the iteration variable to zero. 4692 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 4693 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 4694 4695 // Create a reference to the iteration variable; we'll use this several 4696 // times throughout. 4697 Expr *IterationVarRef 4698 = S.BuildDeclRefExpr(IterationVar, SizeType, Loc).takeAs<Expr>(); 4699 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 4700 4701 // Create the DeclStmt that holds the iteration variable. 4702 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 4703 4704 // Create the comparison against the array bound. 4705 llvm::APInt Upper = ArrayTy->getSize(); 4706 Upper.zextOrTrunc(S.Context.getTypeSize(SizeType)); 4707 Expr *Comparison 4708 = new (S.Context) BinaryOperator(IterationVarRef->Retain(), 4709 IntegerLiteral::Create(S.Context, 4710 Upper, SizeType, Loc), 4711 BO_NE, S.Context.BoolTy, Loc); 4712 4713 // Create the pre-increment of the iteration variable. 4714 Expr *Increment 4715 = new (S.Context) UnaryOperator(IterationVarRef->Retain(), 4716 UO_PreInc, 4717 SizeType, Loc); 4718 4719 // Subscript the "from" and "to" expressions with the iteration variable. 4720 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 4721 IterationVarRef, Loc)); 4722 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 4723 IterationVarRef, Loc)); 4724 4725 // Build the copy for an individual element of the array. 4726 StmtResult Copy = BuildSingleCopyAssign(S, Loc, 4727 ArrayTy->getElementType(), 4728 To, From, 4729 CopyingBaseSubobject, Depth+1); 4730 if (Copy.isInvalid()) 4731 return StmtError(); 4732 4733 // Construct the loop that copies all elements of this array. 4734 return S.ActOnForStmt(Loc, Loc, InitStmt, 4735 S.MakeFullExpr(Comparison), 4736 0, S.MakeFullExpr(Increment), 4737 Loc, Copy.take()); 4738} 4739 4740/// \brief Determine whether the given class has a copy assignment operator 4741/// that accepts a const-qualified argument. 4742static bool hasConstCopyAssignment(Sema &S, const CXXRecordDecl *CClass) { 4743 CXXRecordDecl *Class = const_cast<CXXRecordDecl *>(CClass); 4744 4745 if (!Class->hasDeclaredCopyAssignment()) 4746 S.DeclareImplicitCopyAssignment(Class); 4747 4748 QualType ClassType = S.Context.getCanonicalType(S.Context.getTypeDeclType(Class)); 4749 DeclarationName OpName 4750 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4751 4752 DeclContext::lookup_const_iterator Op, OpEnd; 4753 for (llvm::tie(Op, OpEnd) = Class->lookup(OpName); Op != OpEnd; ++Op) { 4754 // C++ [class.copy]p9: 4755 // A user-declared copy assignment operator is a non-static non-template 4756 // member function of class X with exactly one parameter of type X, X&, 4757 // const X&, volatile X& or const volatile X&. 4758 const CXXMethodDecl* Method = dyn_cast<CXXMethodDecl>(*Op); 4759 if (!Method) 4760 continue; 4761 4762 if (Method->isStatic()) 4763 continue; 4764 if (Method->getPrimaryTemplate()) 4765 continue; 4766 const FunctionProtoType *FnType = 4767 Method->getType()->getAs<FunctionProtoType>(); 4768 assert(FnType && "Overloaded operator has no prototype."); 4769 // Don't assert on this; an invalid decl might have been left in the AST. 4770 if (FnType->getNumArgs() != 1 || FnType->isVariadic()) 4771 continue; 4772 bool AcceptsConst = true; 4773 QualType ArgType = FnType->getArgType(0); 4774 if (const LValueReferenceType *Ref = ArgType->getAs<LValueReferenceType>()){ 4775 ArgType = Ref->getPointeeType(); 4776 // Is it a non-const lvalue reference? 4777 if (!ArgType.isConstQualified()) 4778 AcceptsConst = false; 4779 } 4780 if (!S.Context.hasSameUnqualifiedType(ArgType, ClassType)) 4781 continue; 4782 4783 // We have a single argument of type cv X or cv X&, i.e. we've found the 4784 // copy assignment operator. Return whether it accepts const arguments. 4785 return AcceptsConst; 4786 } 4787 assert(Class->isInvalidDecl() && 4788 "No copy assignment operator declared in valid code."); 4789 return false; 4790} 4791 4792CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 4793 // Note: The following rules are largely analoguous to the copy 4794 // constructor rules. Note that virtual bases are not taken into account 4795 // for determining the argument type of the operator. Note also that 4796 // operators taking an object instead of a reference are allowed. 4797 4798 4799 // C++ [class.copy]p10: 4800 // If the class definition does not explicitly declare a copy 4801 // assignment operator, one is declared implicitly. 4802 // The implicitly-defined copy assignment operator for a class X 4803 // will have the form 4804 // 4805 // X& X::operator=(const X&) 4806 // 4807 // if 4808 bool HasConstCopyAssignment = true; 4809 4810 // -- each direct base class B of X has a copy assignment operator 4811 // whose parameter is of type const B&, const volatile B& or B, 4812 // and 4813 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4814 BaseEnd = ClassDecl->bases_end(); 4815 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 4816 assert(!Base->getType()->isDependentType() && 4817 "Cannot generate implicit members for class with dependent bases."); 4818 const CXXRecordDecl *BaseClassDecl 4819 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4820 HasConstCopyAssignment = hasConstCopyAssignment(*this, BaseClassDecl); 4821 } 4822 4823 // -- for all the nonstatic data members of X that are of a class 4824 // type M (or array thereof), each such class type has a copy 4825 // assignment operator whose parameter is of type const M&, 4826 // const volatile M& or M. 4827 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4828 FieldEnd = ClassDecl->field_end(); 4829 HasConstCopyAssignment && Field != FieldEnd; 4830 ++Field) { 4831 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4832 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4833 const CXXRecordDecl *FieldClassDecl 4834 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4835 HasConstCopyAssignment = hasConstCopyAssignment(*this, FieldClassDecl); 4836 } 4837 } 4838 4839 // Otherwise, the implicitly declared copy assignment operator will 4840 // have the form 4841 // 4842 // X& X::operator=(X&) 4843 QualType ArgType = Context.getTypeDeclType(ClassDecl); 4844 QualType RetType = Context.getLValueReferenceType(ArgType); 4845 if (HasConstCopyAssignment) 4846 ArgType = ArgType.withConst(); 4847 ArgType = Context.getLValueReferenceType(ArgType); 4848 4849 // C++ [except.spec]p14: 4850 // An implicitly declared special member function (Clause 12) shall have an 4851 // exception-specification. [...] 4852 ImplicitExceptionSpecification ExceptSpec(Context); 4853 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4854 BaseEnd = ClassDecl->bases_end(); 4855 Base != BaseEnd; ++Base) { 4856 CXXRecordDecl *BaseClassDecl 4857 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 4858 4859 if (!BaseClassDecl->hasDeclaredCopyAssignment()) 4860 DeclareImplicitCopyAssignment(BaseClassDecl); 4861 4862 if (CXXMethodDecl *CopyAssign 4863 = BaseClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4864 ExceptSpec.CalledDecl(CopyAssign); 4865 } 4866 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 4867 FieldEnd = ClassDecl->field_end(); 4868 Field != FieldEnd; 4869 ++Field) { 4870 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 4871 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 4872 CXXRecordDecl *FieldClassDecl 4873 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 4874 4875 if (!FieldClassDecl->hasDeclaredCopyAssignment()) 4876 DeclareImplicitCopyAssignment(FieldClassDecl); 4877 4878 if (CXXMethodDecl *CopyAssign 4879 = FieldClassDecl->getCopyAssignmentOperator(HasConstCopyAssignment)) 4880 ExceptSpec.CalledDecl(CopyAssign); 4881 } 4882 } 4883 4884 // An implicitly-declared copy assignment operator is an inline public 4885 // member of its class. 4886 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 4887 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 4888 CXXMethodDecl *CopyAssignment 4889 = CXXMethodDecl::Create(Context, ClassDecl, NameInfo, 4890 Context.getFunctionType(RetType, &ArgType, 1, 4891 false, 0, 4892 ExceptSpec.hasExceptionSpecification(), 4893 ExceptSpec.hasAnyExceptionSpecification(), 4894 ExceptSpec.size(), 4895 ExceptSpec.data(), 4896 FunctionType::ExtInfo()), 4897 /*TInfo=*/0, /*isStatic=*/false, 4898 /*StorageClassAsWritten=*/SC_None, 4899 /*isInline=*/true); 4900 CopyAssignment->setAccess(AS_public); 4901 CopyAssignment->setImplicit(); 4902 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 4903 CopyAssignment->setCopyAssignment(true); 4904 4905 // Add the parameter to the operator. 4906 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 4907 ClassDecl->getLocation(), 4908 /*Id=*/0, 4909 ArgType, /*TInfo=*/0, 4910 SC_None, 4911 SC_None, 0); 4912 CopyAssignment->setParams(&FromParam, 1); 4913 4914 // Note that we have added this copy-assignment operator. 4915 ClassDecl->setDeclaredCopyAssignment(true); 4916 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 4917 4918 if (Scope *S = getScopeForContext(ClassDecl)) 4919 PushOnScopeChains(CopyAssignment, S, false); 4920 ClassDecl->addDecl(CopyAssignment); 4921 4922 AddOverriddenMethods(ClassDecl, CopyAssignment); 4923 return CopyAssignment; 4924} 4925 4926void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 4927 CXXMethodDecl *CopyAssignOperator) { 4928 assert((CopyAssignOperator->isImplicit() && 4929 CopyAssignOperator->isOverloadedOperator() && 4930 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 4931 !CopyAssignOperator->isUsed(false)) && 4932 "DefineImplicitCopyAssignment called for wrong function"); 4933 4934 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 4935 4936 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 4937 CopyAssignOperator->setInvalidDecl(); 4938 return; 4939 } 4940 4941 CopyAssignOperator->setUsed(); 4942 4943 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 4944 ErrorTrap Trap(*this); 4945 4946 // C++0x [class.copy]p30: 4947 // The implicitly-defined or explicitly-defaulted copy assignment operator 4948 // for a non-union class X performs memberwise copy assignment of its 4949 // subobjects. The direct base classes of X are assigned first, in the 4950 // order of their declaration in the base-specifier-list, and then the 4951 // immediate non-static data members of X are assigned, in the order in 4952 // which they were declared in the class definition. 4953 4954 // The statements that form the synthesized function body. 4955 ASTOwningVector<Stmt*> Statements(*this); 4956 4957 // The parameter for the "other" object, which we are copying from. 4958 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 4959 Qualifiers OtherQuals = Other->getType().getQualifiers(); 4960 QualType OtherRefType = Other->getType(); 4961 if (const LValueReferenceType *OtherRef 4962 = OtherRefType->getAs<LValueReferenceType>()) { 4963 OtherRefType = OtherRef->getPointeeType(); 4964 OtherQuals = OtherRefType.getQualifiers(); 4965 } 4966 4967 // Our location for everything implicitly-generated. 4968 SourceLocation Loc = CopyAssignOperator->getLocation(); 4969 4970 // Construct a reference to the "other" object. We'll be using this 4971 // throughout the generated ASTs. 4972 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, Loc).takeAs<Expr>(); 4973 assert(OtherRef && "Reference to parameter cannot fail!"); 4974 4975 // Construct the "this" pointer. We'll be using this throughout the generated 4976 // ASTs. 4977 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 4978 assert(This && "Reference to this cannot fail!"); 4979 4980 // Assign base classes. 4981 bool Invalid = false; 4982 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 4983 E = ClassDecl->bases_end(); Base != E; ++Base) { 4984 // Form the assignment: 4985 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 4986 QualType BaseType = Base->getType().getUnqualifiedType(); 4987 CXXRecordDecl *BaseClassDecl = 0; 4988 if (const RecordType *BaseRecordT = BaseType->getAs<RecordType>()) 4989 BaseClassDecl = cast<CXXRecordDecl>(BaseRecordT->getDecl()); 4990 else { 4991 Invalid = true; 4992 continue; 4993 } 4994 4995 CXXCastPath BasePath; 4996 BasePath.push_back(Base); 4997 4998 // Construct the "from" expression, which is an implicit cast to the 4999 // appropriately-qualified base type. 5000 Expr *From = OtherRef->Retain(); 5001 ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 5002 CK_UncheckedDerivedToBase, 5003 VK_LValue, &BasePath); 5004 5005 // Dereference "this". 5006 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5007 5008 // Implicitly cast "this" to the appropriately-qualified base type. 5009 Expr *ToE = To.takeAs<Expr>(); 5010 ImpCastExprToType(ToE, 5011 Context.getCVRQualifiedType(BaseType, 5012 CopyAssignOperator->getTypeQualifiers()), 5013 CK_UncheckedDerivedToBase, 5014 VK_LValue, &BasePath); 5015 To = Owned(ToE); 5016 5017 // Build the copy. 5018 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 5019 To.get(), From, 5020 /*CopyingBaseSubobject=*/true); 5021 if (Copy.isInvalid()) { 5022 Diag(CurrentLocation, diag::note_member_synthesized_at) 5023 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5024 CopyAssignOperator->setInvalidDecl(); 5025 return; 5026 } 5027 5028 // Success! Record the copy. 5029 Statements.push_back(Copy.takeAs<Expr>()); 5030 } 5031 5032 // \brief Reference to the __builtin_memcpy function. 5033 Expr *BuiltinMemCpyRef = 0; 5034 // \brief Reference to the __builtin_objc_memmove_collectable function. 5035 Expr *CollectableMemCpyRef = 0; 5036 5037 // Assign non-static members. 5038 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5039 FieldEnd = ClassDecl->field_end(); 5040 Field != FieldEnd; ++Field) { 5041 // Check for members of reference type; we can't copy those. 5042 if (Field->getType()->isReferenceType()) { 5043 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5044 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 5045 Diag(Field->getLocation(), diag::note_declared_at); 5046 Diag(CurrentLocation, diag::note_member_synthesized_at) 5047 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5048 Invalid = true; 5049 continue; 5050 } 5051 5052 // Check for members of const-qualified, non-class type. 5053 QualType BaseType = Context.getBaseElementType(Field->getType()); 5054 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 5055 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 5056 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 5057 Diag(Field->getLocation(), diag::note_declared_at); 5058 Diag(CurrentLocation, diag::note_member_synthesized_at) 5059 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5060 Invalid = true; 5061 continue; 5062 } 5063 5064 QualType FieldType = Field->getType().getNonReferenceType(); 5065 if (FieldType->isIncompleteArrayType()) { 5066 assert(ClassDecl->hasFlexibleArrayMember() && 5067 "Incomplete array type is not valid"); 5068 continue; 5069 } 5070 5071 // Build references to the field in the object we're copying from and to. 5072 CXXScopeSpec SS; // Intentionally empty 5073 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 5074 LookupMemberName); 5075 MemberLookup.addDecl(*Field); 5076 MemberLookup.resolveKind(); 5077 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 5078 Loc, /*IsArrow=*/false, 5079 SS, 0, MemberLookup, 0); 5080 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 5081 Loc, /*IsArrow=*/true, 5082 SS, 0, MemberLookup, 0); 5083 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 5084 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 5085 5086 // If the field should be copied with __builtin_memcpy rather than via 5087 // explicit assignments, do so. This optimization only applies for arrays 5088 // of scalars and arrays of class type with trivial copy-assignment 5089 // operators. 5090 if (FieldType->isArrayType() && 5091 (!BaseType->isRecordType() || 5092 cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl()) 5093 ->hasTrivialCopyAssignment())) { 5094 // Compute the size of the memory buffer to be copied. 5095 QualType SizeType = Context.getSizeType(); 5096 llvm::APInt Size(Context.getTypeSize(SizeType), 5097 Context.getTypeSizeInChars(BaseType).getQuantity()); 5098 for (const ConstantArrayType *Array 5099 = Context.getAsConstantArrayType(FieldType); 5100 Array; 5101 Array = Context.getAsConstantArrayType(Array->getElementType())) { 5102 llvm::APInt ArraySize = Array->getSize(); 5103 ArraySize.zextOrTrunc(Size.getBitWidth()); 5104 Size *= ArraySize; 5105 } 5106 5107 // Take the address of the field references for "from" and "to". 5108 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 5109 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 5110 5111 bool NeedsCollectableMemCpy = 5112 (BaseType->isRecordType() && 5113 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 5114 5115 if (NeedsCollectableMemCpy) { 5116 if (!CollectableMemCpyRef) { 5117 // Create a reference to the __builtin_objc_memmove_collectable function. 5118 LookupResult R(*this, 5119 &Context.Idents.get("__builtin_objc_memmove_collectable"), 5120 Loc, LookupOrdinaryName); 5121 LookupName(R, TUScope, true); 5122 5123 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 5124 if (!CollectableMemCpy) { 5125 // Something went horribly wrong earlier, and we will have 5126 // complained about it. 5127 Invalid = true; 5128 continue; 5129 } 5130 5131 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 5132 CollectableMemCpy->getType(), 5133 Loc, 0).takeAs<Expr>(); 5134 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 5135 } 5136 } 5137 // Create a reference to the __builtin_memcpy builtin function. 5138 else if (!BuiltinMemCpyRef) { 5139 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 5140 LookupOrdinaryName); 5141 LookupName(R, TUScope, true); 5142 5143 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 5144 if (!BuiltinMemCpy) { 5145 // Something went horribly wrong earlier, and we will have complained 5146 // about it. 5147 Invalid = true; 5148 continue; 5149 } 5150 5151 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 5152 BuiltinMemCpy->getType(), 5153 Loc, 0).takeAs<Expr>(); 5154 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 5155 } 5156 5157 ASTOwningVector<Expr*> CallArgs(*this); 5158 CallArgs.push_back(To.takeAs<Expr>()); 5159 CallArgs.push_back(From.takeAs<Expr>()); 5160 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 5161 llvm::SmallVector<SourceLocation, 4> Commas; // FIXME: Silly 5162 Commas.push_back(Loc); 5163 Commas.push_back(Loc); 5164 ExprResult Call = ExprError(); 5165 if (NeedsCollectableMemCpy) 5166 Call = ActOnCallExpr(/*Scope=*/0, 5167 CollectableMemCpyRef, 5168 Loc, move_arg(CallArgs), 5169 Commas.data(), Loc); 5170 else 5171 Call = ActOnCallExpr(/*Scope=*/0, 5172 BuiltinMemCpyRef, 5173 Loc, move_arg(CallArgs), 5174 Commas.data(), Loc); 5175 5176 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 5177 Statements.push_back(Call.takeAs<Expr>()); 5178 continue; 5179 } 5180 5181 // Build the copy of this field. 5182 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 5183 To.get(), From.get(), 5184 /*CopyingBaseSubobject=*/false); 5185 if (Copy.isInvalid()) { 5186 Diag(CurrentLocation, diag::note_member_synthesized_at) 5187 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5188 CopyAssignOperator->setInvalidDecl(); 5189 return; 5190 } 5191 5192 // Success! Record the copy. 5193 Statements.push_back(Copy.takeAs<Stmt>()); 5194 } 5195 5196 if (!Invalid) { 5197 // Add a "return *this;" 5198 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 5199 5200 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 5201 if (Return.isInvalid()) 5202 Invalid = true; 5203 else { 5204 Statements.push_back(Return.takeAs<Stmt>()); 5205 5206 if (Trap.hasErrorOccurred()) { 5207 Diag(CurrentLocation, diag::note_member_synthesized_at) 5208 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 5209 Invalid = true; 5210 } 5211 } 5212 } 5213 5214 if (Invalid) { 5215 CopyAssignOperator->setInvalidDecl(); 5216 return; 5217 } 5218 5219 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 5220 /*isStmtExpr=*/false); 5221 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 5222 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 5223} 5224 5225CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 5226 CXXRecordDecl *ClassDecl) { 5227 // C++ [class.copy]p4: 5228 // If the class definition does not explicitly declare a copy 5229 // constructor, one is declared implicitly. 5230 5231 // C++ [class.copy]p5: 5232 // The implicitly-declared copy constructor for a class X will 5233 // have the form 5234 // 5235 // X::X(const X&) 5236 // 5237 // if 5238 bool HasConstCopyConstructor = true; 5239 5240 // -- each direct or virtual base class B of X has a copy 5241 // constructor whose first parameter is of type const B& or 5242 // const volatile B&, and 5243 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5244 BaseEnd = ClassDecl->bases_end(); 5245 HasConstCopyConstructor && Base != BaseEnd; 5246 ++Base) { 5247 // Virtual bases are handled below. 5248 if (Base->isVirtual()) 5249 continue; 5250 5251 CXXRecordDecl *BaseClassDecl 5252 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5253 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5254 DeclareImplicitCopyConstructor(BaseClassDecl); 5255 5256 HasConstCopyConstructor 5257 = BaseClassDecl->hasConstCopyConstructor(Context); 5258 } 5259 5260 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5261 BaseEnd = ClassDecl->vbases_end(); 5262 HasConstCopyConstructor && Base != BaseEnd; 5263 ++Base) { 5264 CXXRecordDecl *BaseClassDecl 5265 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5266 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5267 DeclareImplicitCopyConstructor(BaseClassDecl); 5268 5269 HasConstCopyConstructor 5270 = BaseClassDecl->hasConstCopyConstructor(Context); 5271 } 5272 5273 // -- for all the nonstatic data members of X that are of a 5274 // class type M (or array thereof), each such class type 5275 // has a copy constructor whose first parameter is of type 5276 // const M& or const volatile M&. 5277 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5278 FieldEnd = ClassDecl->field_end(); 5279 HasConstCopyConstructor && Field != FieldEnd; 5280 ++Field) { 5281 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5282 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5283 CXXRecordDecl *FieldClassDecl 5284 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5285 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5286 DeclareImplicitCopyConstructor(FieldClassDecl); 5287 5288 HasConstCopyConstructor 5289 = FieldClassDecl->hasConstCopyConstructor(Context); 5290 } 5291 } 5292 5293 // Otherwise, the implicitly declared copy constructor will have 5294 // the form 5295 // 5296 // X::X(X&) 5297 QualType ClassType = Context.getTypeDeclType(ClassDecl); 5298 QualType ArgType = ClassType; 5299 if (HasConstCopyConstructor) 5300 ArgType = ArgType.withConst(); 5301 ArgType = Context.getLValueReferenceType(ArgType); 5302 5303 // C++ [except.spec]p14: 5304 // An implicitly declared special member function (Clause 12) shall have an 5305 // exception-specification. [...] 5306 ImplicitExceptionSpecification ExceptSpec(Context); 5307 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 5308 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 5309 BaseEnd = ClassDecl->bases_end(); 5310 Base != BaseEnd; 5311 ++Base) { 5312 // Virtual bases are handled below. 5313 if (Base->isVirtual()) 5314 continue; 5315 5316 CXXRecordDecl *BaseClassDecl 5317 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5318 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5319 DeclareImplicitCopyConstructor(BaseClassDecl); 5320 5321 if (CXXConstructorDecl *CopyConstructor 5322 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5323 ExceptSpec.CalledDecl(CopyConstructor); 5324 } 5325 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 5326 BaseEnd = ClassDecl->vbases_end(); 5327 Base != BaseEnd; 5328 ++Base) { 5329 CXXRecordDecl *BaseClassDecl 5330 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 5331 if (!BaseClassDecl->hasDeclaredCopyConstructor()) 5332 DeclareImplicitCopyConstructor(BaseClassDecl); 5333 5334 if (CXXConstructorDecl *CopyConstructor 5335 = BaseClassDecl->getCopyConstructor(Context, Quals)) 5336 ExceptSpec.CalledDecl(CopyConstructor); 5337 } 5338 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 5339 FieldEnd = ClassDecl->field_end(); 5340 Field != FieldEnd; 5341 ++Field) { 5342 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 5343 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 5344 CXXRecordDecl *FieldClassDecl 5345 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 5346 if (!FieldClassDecl->hasDeclaredCopyConstructor()) 5347 DeclareImplicitCopyConstructor(FieldClassDecl); 5348 5349 if (CXXConstructorDecl *CopyConstructor 5350 = FieldClassDecl->getCopyConstructor(Context, Quals)) 5351 ExceptSpec.CalledDecl(CopyConstructor); 5352 } 5353 } 5354 5355 // An implicitly-declared copy constructor is an inline public 5356 // member of its class. 5357 DeclarationName Name 5358 = Context.DeclarationNames.getCXXConstructorName( 5359 Context.getCanonicalType(ClassType)); 5360 DeclarationNameInfo NameInfo(Name, ClassDecl->getLocation()); 5361 CXXConstructorDecl *CopyConstructor 5362 = CXXConstructorDecl::Create(Context, ClassDecl, NameInfo, 5363 Context.getFunctionType(Context.VoidTy, 5364 &ArgType, 1, 5365 false, 0, 5366 ExceptSpec.hasExceptionSpecification(), 5367 ExceptSpec.hasAnyExceptionSpecification(), 5368 ExceptSpec.size(), 5369 ExceptSpec.data(), 5370 FunctionType::ExtInfo()), 5371 /*TInfo=*/0, 5372 /*isExplicit=*/false, 5373 /*isInline=*/true, 5374 /*isImplicitlyDeclared=*/true); 5375 CopyConstructor->setAccess(AS_public); 5376 CopyConstructor->setImplicit(); 5377 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 5378 5379 // Note that we have declared this constructor. 5380 ClassDecl->setDeclaredCopyConstructor(true); 5381 ++ASTContext::NumImplicitCopyConstructorsDeclared; 5382 5383 // Add the parameter to the constructor. 5384 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 5385 ClassDecl->getLocation(), 5386 /*IdentifierInfo=*/0, 5387 ArgType, /*TInfo=*/0, 5388 SC_None, 5389 SC_None, 0); 5390 CopyConstructor->setParams(&FromParam, 1); 5391 if (Scope *S = getScopeForContext(ClassDecl)) 5392 PushOnScopeChains(CopyConstructor, S, false); 5393 ClassDecl->addDecl(CopyConstructor); 5394 5395 return CopyConstructor; 5396} 5397 5398void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 5399 CXXConstructorDecl *CopyConstructor, 5400 unsigned TypeQuals) { 5401 assert((CopyConstructor->isImplicit() && 5402 CopyConstructor->isCopyConstructor(TypeQuals) && 5403 !CopyConstructor->isUsed(false)) && 5404 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 5405 5406 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 5407 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 5408 5409 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 5410 ErrorTrap Trap(*this); 5411 5412 if (SetBaseOrMemberInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 5413 Trap.hasErrorOccurred()) { 5414 Diag(CurrentLocation, diag::note_member_synthesized_at) 5415 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 5416 CopyConstructor->setInvalidDecl(); 5417 } else { 5418 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 5419 CopyConstructor->getLocation(), 5420 MultiStmtArg(*this, 0, 0), 5421 /*isStmtExpr=*/false) 5422 .takeAs<Stmt>()); 5423 } 5424 5425 CopyConstructor->setUsed(); 5426} 5427 5428ExprResult 5429Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5430 CXXConstructorDecl *Constructor, 5431 MultiExprArg ExprArgs, 5432 bool RequiresZeroInit, 5433 unsigned ConstructKind) { 5434 bool Elidable = false; 5435 5436 // C++0x [class.copy]p34: 5437 // When certain criteria are met, an implementation is allowed to 5438 // omit the copy/move construction of a class object, even if the 5439 // copy/move constructor and/or destructor for the object have 5440 // side effects. [...] 5441 // - when a temporary class object that has not been bound to a 5442 // reference (12.2) would be copied/moved to a class object 5443 // with the same cv-unqualified type, the copy/move operation 5444 // can be omitted by constructing the temporary object 5445 // directly into the target of the omitted copy/move 5446 if (Constructor->isCopyConstructor() && ExprArgs.size() >= 1) { 5447 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 5448 Elidable = SubExpr->isTemporaryObject() && 5449 ConstructKind == CXXConstructExpr::CK_Complete && 5450 Context.hasSameUnqualifiedType(SubExpr->getType(), 5451 Context.getTypeDeclType(Constructor->getParent())); 5452 } 5453 5454 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 5455 Elidable, move(ExprArgs), RequiresZeroInit, 5456 ConstructKind); 5457} 5458 5459/// BuildCXXConstructExpr - Creates a complete call to a constructor, 5460/// including handling of its default argument expressions. 5461ExprResult 5462Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 5463 CXXConstructorDecl *Constructor, bool Elidable, 5464 MultiExprArg ExprArgs, 5465 bool RequiresZeroInit, 5466 unsigned ConstructKind) { 5467 unsigned NumExprs = ExprArgs.size(); 5468 Expr **Exprs = (Expr **)ExprArgs.release(); 5469 5470 MarkDeclarationReferenced(ConstructLoc, Constructor); 5471 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 5472 Constructor, Elidable, Exprs, NumExprs, 5473 RequiresZeroInit, 5474 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind))); 5475} 5476 5477bool Sema::InitializeVarWithConstructor(VarDecl *VD, 5478 CXXConstructorDecl *Constructor, 5479 MultiExprArg Exprs) { 5480 ExprResult TempResult = 5481 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 5482 move(Exprs), false, CXXConstructExpr::CK_Complete); 5483 if (TempResult.isInvalid()) 5484 return true; 5485 5486 Expr *Temp = TempResult.takeAs<Expr>(); 5487 MarkDeclarationReferenced(VD->getLocation(), Constructor); 5488 Temp = MaybeCreateCXXExprWithTemporaries(Temp); 5489 VD->setInit(Temp); 5490 5491 return false; 5492} 5493 5494void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 5495 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 5496 if (!ClassDecl->isInvalidDecl() && !VD->isInvalidDecl() && 5497 !ClassDecl->hasTrivialDestructor() && !ClassDecl->isDependentContext()) { 5498 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 5499 MarkDeclarationReferenced(VD->getLocation(), Destructor); 5500 CheckDestructorAccess(VD->getLocation(), Destructor, 5501 PDiag(diag::err_access_dtor_var) 5502 << VD->getDeclName() 5503 << VD->getType()); 5504 5505 if (!VD->isInvalidDecl() && VD->hasGlobalStorage()) 5506 Diag(VD->getLocation(), diag::warn_global_destructor); 5507 } 5508} 5509 5510/// AddCXXDirectInitializerToDecl - This action is called immediately after 5511/// ActOnDeclarator, when a C++ direct initializer is present. 5512/// e.g: "int x(1);" 5513void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 5514 SourceLocation LParenLoc, 5515 MultiExprArg Exprs, 5516 SourceLocation *CommaLocs, 5517 SourceLocation RParenLoc) { 5518 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 5519 5520 // If there is no declaration, there was an error parsing it. Just ignore 5521 // the initializer. 5522 if (RealDecl == 0) 5523 return; 5524 5525 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5526 if (!VDecl) { 5527 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5528 RealDecl->setInvalidDecl(); 5529 return; 5530 } 5531 5532 // We will represent direct-initialization similarly to copy-initialization: 5533 // int x(1); -as-> int x = 1; 5534 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 5535 // 5536 // Clients that want to distinguish between the two forms, can check for 5537 // direct initializer using VarDecl::hasCXXDirectInitializer(). 5538 // A major benefit is that clients that don't particularly care about which 5539 // exactly form was it (like the CodeGen) can handle both cases without 5540 // special case code. 5541 5542 // C++ 8.5p11: 5543 // The form of initialization (using parentheses or '=') is generally 5544 // insignificant, but does matter when the entity being initialized has a 5545 // class type. 5546 5547 if (!VDecl->getType()->isDependentType() && 5548 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 5549 diag::err_typecheck_decl_incomplete_type)) { 5550 VDecl->setInvalidDecl(); 5551 return; 5552 } 5553 5554 // The variable can not have an abstract class type. 5555 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5556 diag::err_abstract_type_in_decl, 5557 AbstractVariableType)) 5558 VDecl->setInvalidDecl(); 5559 5560 const VarDecl *Def; 5561 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5562 Diag(VDecl->getLocation(), diag::err_redefinition) 5563 << VDecl->getDeclName(); 5564 Diag(Def->getLocation(), diag::note_previous_definition); 5565 VDecl->setInvalidDecl(); 5566 return; 5567 } 5568 5569 // C++ [class.static.data]p4 5570 // If a static data member is of const integral or const 5571 // enumeration type, its declaration in the class definition can 5572 // specify a constant-initializer which shall be an integral 5573 // constant expression (5.19). In that case, the member can appear 5574 // in integral constant expressions. The member shall still be 5575 // defined in a namespace scope if it is used in the program and the 5576 // namespace scope definition shall not contain an initializer. 5577 // 5578 // We already performed a redefinition check above, but for static 5579 // data members we also need to check whether there was an in-class 5580 // declaration with an initializer. 5581 const VarDecl* PrevInit = 0; 5582 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5583 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5584 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5585 return; 5586 } 5587 5588 // If either the declaration has a dependent type or if any of the 5589 // expressions is type-dependent, we represent the initialization 5590 // via a ParenListExpr for later use during template instantiation. 5591 if (VDecl->getType()->isDependentType() || 5592 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 5593 // Let clients know that initialization was done with a direct initializer. 5594 VDecl->setCXXDirectInitializer(true); 5595 5596 // Store the initialization expressions as a ParenListExpr. 5597 unsigned NumExprs = Exprs.size(); 5598 VDecl->setInit(new (Context) ParenListExpr(Context, LParenLoc, 5599 (Expr **)Exprs.release(), 5600 NumExprs, RParenLoc)); 5601 return; 5602 } 5603 5604 // Capture the variable that is being initialized and the style of 5605 // initialization. 5606 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5607 5608 // FIXME: Poor source location information. 5609 InitializationKind Kind 5610 = InitializationKind::CreateDirect(VDecl->getLocation(), 5611 LParenLoc, RParenLoc); 5612 5613 InitializationSequence InitSeq(*this, Entity, Kind, 5614 Exprs.get(), Exprs.size()); 5615 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 5616 if (Result.isInvalid()) { 5617 VDecl->setInvalidDecl(); 5618 return; 5619 } 5620 5621 Result = MaybeCreateCXXExprWithTemporaries(Result.get()); 5622 VDecl->setInit(Result.takeAs<Expr>()); 5623 VDecl->setCXXDirectInitializer(true); 5624 5625 if (!VDecl->isInvalidDecl() && 5626 !VDecl->getDeclContext()->isDependentContext() && 5627 VDecl->hasGlobalStorage() && 5628 !VDecl->getInit()->isConstantInitializer(Context, 5629 VDecl->getType()->isReferenceType())) 5630 Diag(VDecl->getLocation(), diag::warn_global_constructor) 5631 << VDecl->getInit()->getSourceRange(); 5632 5633 if (const RecordType *Record = VDecl->getType()->getAs<RecordType>()) 5634 FinalizeVarWithDestructor(VDecl, Record); 5635} 5636 5637/// \brief Given a constructor and the set of arguments provided for the 5638/// constructor, convert the arguments and add any required default arguments 5639/// to form a proper call to this constructor. 5640/// 5641/// \returns true if an error occurred, false otherwise. 5642bool 5643Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 5644 MultiExprArg ArgsPtr, 5645 SourceLocation Loc, 5646 ASTOwningVector<Expr*> &ConvertedArgs) { 5647 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 5648 unsigned NumArgs = ArgsPtr.size(); 5649 Expr **Args = (Expr **)ArgsPtr.get(); 5650 5651 const FunctionProtoType *Proto 5652 = Constructor->getType()->getAs<FunctionProtoType>(); 5653 assert(Proto && "Constructor without a prototype?"); 5654 unsigned NumArgsInProto = Proto->getNumArgs(); 5655 5656 // If too few arguments are available, we'll fill in the rest with defaults. 5657 if (NumArgs < NumArgsInProto) 5658 ConvertedArgs.reserve(NumArgsInProto); 5659 else 5660 ConvertedArgs.reserve(NumArgs); 5661 5662 VariadicCallType CallType = 5663 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 5664 llvm::SmallVector<Expr *, 8> AllArgs; 5665 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 5666 Proto, 0, Args, NumArgs, AllArgs, 5667 CallType); 5668 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 5669 ConvertedArgs.push_back(AllArgs[i]); 5670 return Invalid; 5671} 5672 5673static inline bool 5674CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 5675 const FunctionDecl *FnDecl) { 5676 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 5677 if (isa<NamespaceDecl>(DC)) { 5678 return SemaRef.Diag(FnDecl->getLocation(), 5679 diag::err_operator_new_delete_declared_in_namespace) 5680 << FnDecl->getDeclName(); 5681 } 5682 5683 if (isa<TranslationUnitDecl>(DC) && 5684 FnDecl->getStorageClass() == SC_Static) { 5685 return SemaRef.Diag(FnDecl->getLocation(), 5686 diag::err_operator_new_delete_declared_static) 5687 << FnDecl->getDeclName(); 5688 } 5689 5690 return false; 5691} 5692 5693static inline bool 5694CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 5695 CanQualType ExpectedResultType, 5696 CanQualType ExpectedFirstParamType, 5697 unsigned DependentParamTypeDiag, 5698 unsigned InvalidParamTypeDiag) { 5699 QualType ResultType = 5700 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 5701 5702 // Check that the result type is not dependent. 5703 if (ResultType->isDependentType()) 5704 return SemaRef.Diag(FnDecl->getLocation(), 5705 diag::err_operator_new_delete_dependent_result_type) 5706 << FnDecl->getDeclName() << ExpectedResultType; 5707 5708 // Check that the result type is what we expect. 5709 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 5710 return SemaRef.Diag(FnDecl->getLocation(), 5711 diag::err_operator_new_delete_invalid_result_type) 5712 << FnDecl->getDeclName() << ExpectedResultType; 5713 5714 // A function template must have at least 2 parameters. 5715 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 5716 return SemaRef.Diag(FnDecl->getLocation(), 5717 diag::err_operator_new_delete_template_too_few_parameters) 5718 << FnDecl->getDeclName(); 5719 5720 // The function decl must have at least 1 parameter. 5721 if (FnDecl->getNumParams() == 0) 5722 return SemaRef.Diag(FnDecl->getLocation(), 5723 diag::err_operator_new_delete_too_few_parameters) 5724 << FnDecl->getDeclName(); 5725 5726 // Check the the first parameter type is not dependent. 5727 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 5728 if (FirstParamType->isDependentType()) 5729 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 5730 << FnDecl->getDeclName() << ExpectedFirstParamType; 5731 5732 // Check that the first parameter type is what we expect. 5733 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 5734 ExpectedFirstParamType) 5735 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 5736 << FnDecl->getDeclName() << ExpectedFirstParamType; 5737 5738 return false; 5739} 5740 5741static bool 5742CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5743 // C++ [basic.stc.dynamic.allocation]p1: 5744 // A program is ill-formed if an allocation function is declared in a 5745 // namespace scope other than global scope or declared static in global 5746 // scope. 5747 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5748 return true; 5749 5750 CanQualType SizeTy = 5751 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 5752 5753 // C++ [basic.stc.dynamic.allocation]p1: 5754 // The return type shall be void*. The first parameter shall have type 5755 // std::size_t. 5756 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 5757 SizeTy, 5758 diag::err_operator_new_dependent_param_type, 5759 diag::err_operator_new_param_type)) 5760 return true; 5761 5762 // C++ [basic.stc.dynamic.allocation]p1: 5763 // The first parameter shall not have an associated default argument. 5764 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 5765 return SemaRef.Diag(FnDecl->getLocation(), 5766 diag::err_operator_new_default_arg) 5767 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 5768 5769 return false; 5770} 5771 5772static bool 5773CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 5774 // C++ [basic.stc.dynamic.deallocation]p1: 5775 // A program is ill-formed if deallocation functions are declared in a 5776 // namespace scope other than global scope or declared static in global 5777 // scope. 5778 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 5779 return true; 5780 5781 // C++ [basic.stc.dynamic.deallocation]p2: 5782 // Each deallocation function shall return void and its first parameter 5783 // shall be void*. 5784 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 5785 SemaRef.Context.VoidPtrTy, 5786 diag::err_operator_delete_dependent_param_type, 5787 diag::err_operator_delete_param_type)) 5788 return true; 5789 5790 return false; 5791} 5792 5793/// CheckOverloadedOperatorDeclaration - Check whether the declaration 5794/// of this overloaded operator is well-formed. If so, returns false; 5795/// otherwise, emits appropriate diagnostics and returns true. 5796bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 5797 assert(FnDecl && FnDecl->isOverloadedOperator() && 5798 "Expected an overloaded operator declaration"); 5799 5800 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 5801 5802 // C++ [over.oper]p5: 5803 // The allocation and deallocation functions, operator new, 5804 // operator new[], operator delete and operator delete[], are 5805 // described completely in 3.7.3. The attributes and restrictions 5806 // found in the rest of this subclause do not apply to them unless 5807 // explicitly stated in 3.7.3. 5808 if (Op == OO_Delete || Op == OO_Array_Delete) 5809 return CheckOperatorDeleteDeclaration(*this, FnDecl); 5810 5811 if (Op == OO_New || Op == OO_Array_New) 5812 return CheckOperatorNewDeclaration(*this, FnDecl); 5813 5814 // C++ [over.oper]p6: 5815 // An operator function shall either be a non-static member 5816 // function or be a non-member function and have at least one 5817 // parameter whose type is a class, a reference to a class, an 5818 // enumeration, or a reference to an enumeration. 5819 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 5820 if (MethodDecl->isStatic()) 5821 return Diag(FnDecl->getLocation(), 5822 diag::err_operator_overload_static) << FnDecl->getDeclName(); 5823 } else { 5824 bool ClassOrEnumParam = false; 5825 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 5826 ParamEnd = FnDecl->param_end(); 5827 Param != ParamEnd; ++Param) { 5828 QualType ParamType = (*Param)->getType().getNonReferenceType(); 5829 if (ParamType->isDependentType() || ParamType->isRecordType() || 5830 ParamType->isEnumeralType()) { 5831 ClassOrEnumParam = true; 5832 break; 5833 } 5834 } 5835 5836 if (!ClassOrEnumParam) 5837 return Diag(FnDecl->getLocation(), 5838 diag::err_operator_overload_needs_class_or_enum) 5839 << FnDecl->getDeclName(); 5840 } 5841 5842 // C++ [over.oper]p8: 5843 // An operator function cannot have default arguments (8.3.6), 5844 // except where explicitly stated below. 5845 // 5846 // Only the function-call operator allows default arguments 5847 // (C++ [over.call]p1). 5848 if (Op != OO_Call) { 5849 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5850 Param != FnDecl->param_end(); ++Param) { 5851 if ((*Param)->hasDefaultArg()) 5852 return Diag((*Param)->getLocation(), 5853 diag::err_operator_overload_default_arg) 5854 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 5855 } 5856 } 5857 5858 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 5859 { false, false, false } 5860#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 5861 , { Unary, Binary, MemberOnly } 5862#include "clang/Basic/OperatorKinds.def" 5863 }; 5864 5865 bool CanBeUnaryOperator = OperatorUses[Op][0]; 5866 bool CanBeBinaryOperator = OperatorUses[Op][1]; 5867 bool MustBeMemberOperator = OperatorUses[Op][2]; 5868 5869 // C++ [over.oper]p8: 5870 // [...] Operator functions cannot have more or fewer parameters 5871 // than the number required for the corresponding operator, as 5872 // described in the rest of this subclause. 5873 unsigned NumParams = FnDecl->getNumParams() 5874 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 5875 if (Op != OO_Call && 5876 ((NumParams == 1 && !CanBeUnaryOperator) || 5877 (NumParams == 2 && !CanBeBinaryOperator) || 5878 (NumParams < 1) || (NumParams > 2))) { 5879 // We have the wrong number of parameters. 5880 unsigned ErrorKind; 5881 if (CanBeUnaryOperator && CanBeBinaryOperator) { 5882 ErrorKind = 2; // 2 -> unary or binary. 5883 } else if (CanBeUnaryOperator) { 5884 ErrorKind = 0; // 0 -> unary 5885 } else { 5886 assert(CanBeBinaryOperator && 5887 "All non-call overloaded operators are unary or binary!"); 5888 ErrorKind = 1; // 1 -> binary 5889 } 5890 5891 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 5892 << FnDecl->getDeclName() << NumParams << ErrorKind; 5893 } 5894 5895 // Overloaded operators other than operator() cannot be variadic. 5896 if (Op != OO_Call && 5897 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 5898 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 5899 << FnDecl->getDeclName(); 5900 } 5901 5902 // Some operators must be non-static member functions. 5903 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 5904 return Diag(FnDecl->getLocation(), 5905 diag::err_operator_overload_must_be_member) 5906 << FnDecl->getDeclName(); 5907 } 5908 5909 // C++ [over.inc]p1: 5910 // The user-defined function called operator++ implements the 5911 // prefix and postfix ++ operator. If this function is a member 5912 // function with no parameters, or a non-member function with one 5913 // parameter of class or enumeration type, it defines the prefix 5914 // increment operator ++ for objects of that type. If the function 5915 // is a member function with one parameter (which shall be of type 5916 // int) or a non-member function with two parameters (the second 5917 // of which shall be of type int), it defines the postfix 5918 // increment operator ++ for objects of that type. 5919 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 5920 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 5921 bool ParamIsInt = false; 5922 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 5923 ParamIsInt = BT->getKind() == BuiltinType::Int; 5924 5925 if (!ParamIsInt) 5926 return Diag(LastParam->getLocation(), 5927 diag::err_operator_overload_post_incdec_must_be_int) 5928 << LastParam->getType() << (Op == OO_MinusMinus); 5929 } 5930 5931 // Notify the class if it got an assignment operator. 5932 if (Op == OO_Equal) { 5933 // Would have returned earlier otherwise. 5934 assert(isa<CXXMethodDecl>(FnDecl) && 5935 "Overloaded = not member, but not filtered."); 5936 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 5937 Method->getParent()->addedAssignmentOperator(Context, Method); 5938 } 5939 5940 return false; 5941} 5942 5943/// CheckLiteralOperatorDeclaration - Check whether the declaration 5944/// of this literal operator function is well-formed. If so, returns 5945/// false; otherwise, emits appropriate diagnostics and returns true. 5946bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 5947 DeclContext *DC = FnDecl->getDeclContext(); 5948 Decl::Kind Kind = DC->getDeclKind(); 5949 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 5950 Kind != Decl::LinkageSpec) { 5951 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 5952 << FnDecl->getDeclName(); 5953 return true; 5954 } 5955 5956 bool Valid = false; 5957 5958 // template <char...> type operator "" name() is the only valid template 5959 // signature, and the only valid signature with no parameters. 5960 if (FnDecl->param_size() == 0) { 5961 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 5962 // Must have only one template parameter 5963 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 5964 if (Params->size() == 1) { 5965 NonTypeTemplateParmDecl *PmDecl = 5966 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 5967 5968 // The template parameter must be a char parameter pack. 5969 // FIXME: This test will always fail because non-type parameter packs 5970 // have not been implemented. 5971 if (PmDecl && PmDecl->isTemplateParameterPack() && 5972 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 5973 Valid = true; 5974 } 5975 } 5976 } else { 5977 // Check the first parameter 5978 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 5979 5980 QualType T = (*Param)->getType(); 5981 5982 // unsigned long long int, long double, and any character type are allowed 5983 // as the only parameters. 5984 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 5985 Context.hasSameType(T, Context.LongDoubleTy) || 5986 Context.hasSameType(T, Context.CharTy) || 5987 Context.hasSameType(T, Context.WCharTy) || 5988 Context.hasSameType(T, Context.Char16Ty) || 5989 Context.hasSameType(T, Context.Char32Ty)) { 5990 if (++Param == FnDecl->param_end()) 5991 Valid = true; 5992 goto FinishedParams; 5993 } 5994 5995 // Otherwise it must be a pointer to const; let's strip those qualifiers. 5996 const PointerType *PT = T->getAs<PointerType>(); 5997 if (!PT) 5998 goto FinishedParams; 5999 T = PT->getPointeeType(); 6000 if (!T.isConstQualified()) 6001 goto FinishedParams; 6002 T = T.getUnqualifiedType(); 6003 6004 // Move on to the second parameter; 6005 ++Param; 6006 6007 // If there is no second parameter, the first must be a const char * 6008 if (Param == FnDecl->param_end()) { 6009 if (Context.hasSameType(T, Context.CharTy)) 6010 Valid = true; 6011 goto FinishedParams; 6012 } 6013 6014 // const char *, const wchar_t*, const char16_t*, and const char32_t* 6015 // are allowed as the first parameter to a two-parameter function 6016 if (!(Context.hasSameType(T, Context.CharTy) || 6017 Context.hasSameType(T, Context.WCharTy) || 6018 Context.hasSameType(T, Context.Char16Ty) || 6019 Context.hasSameType(T, Context.Char32Ty))) 6020 goto FinishedParams; 6021 6022 // The second and final parameter must be an std::size_t 6023 T = (*Param)->getType().getUnqualifiedType(); 6024 if (Context.hasSameType(T, Context.getSizeType()) && 6025 ++Param == FnDecl->param_end()) 6026 Valid = true; 6027 } 6028 6029 // FIXME: This diagnostic is absolutely terrible. 6030FinishedParams: 6031 if (!Valid) { 6032 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 6033 << FnDecl->getDeclName(); 6034 return true; 6035 } 6036 6037 return false; 6038} 6039 6040/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 6041/// linkage specification, including the language and (if present) 6042/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 6043/// the location of the language string literal, which is provided 6044/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 6045/// the '{' brace. Otherwise, this linkage specification does not 6046/// have any braces. 6047Decl *Sema::ActOnStartLinkageSpecification(Scope *S, 6048 SourceLocation ExternLoc, 6049 SourceLocation LangLoc, 6050 llvm::StringRef Lang, 6051 SourceLocation LBraceLoc) { 6052 LinkageSpecDecl::LanguageIDs Language; 6053 if (Lang == "\"C\"") 6054 Language = LinkageSpecDecl::lang_c; 6055 else if (Lang == "\"C++\"") 6056 Language = LinkageSpecDecl::lang_cxx; 6057 else { 6058 Diag(LangLoc, diag::err_bad_language); 6059 return 0; 6060 } 6061 6062 // FIXME: Add all the various semantics of linkage specifications 6063 6064 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 6065 LangLoc, Language, 6066 LBraceLoc.isValid()); 6067 CurContext->addDecl(D); 6068 PushDeclContext(S, D); 6069 return D; 6070} 6071 6072/// ActOnFinishLinkageSpecification - Complete the definition of 6073/// the C++ linkage specification LinkageSpec. If RBraceLoc is 6074/// valid, it's the position of the closing '}' brace in a linkage 6075/// specification that uses braces. 6076Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 6077 Decl *LinkageSpec, 6078 SourceLocation RBraceLoc) { 6079 if (LinkageSpec) 6080 PopDeclContext(); 6081 return LinkageSpec; 6082} 6083 6084/// \brief Perform semantic analysis for the variable declaration that 6085/// occurs within a C++ catch clause, returning the newly-created 6086/// variable. 6087VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 6088 TypeSourceInfo *TInfo, 6089 IdentifierInfo *Name, 6090 SourceLocation Loc, 6091 SourceRange Range) { 6092 bool Invalid = false; 6093 6094 // Arrays and functions decay. 6095 if (ExDeclType->isArrayType()) 6096 ExDeclType = Context.getArrayDecayedType(ExDeclType); 6097 else if (ExDeclType->isFunctionType()) 6098 ExDeclType = Context.getPointerType(ExDeclType); 6099 6100 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 6101 // The exception-declaration shall not denote a pointer or reference to an 6102 // incomplete type, other than [cv] void*. 6103 // N2844 forbids rvalue references. 6104 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 6105 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 6106 Invalid = true; 6107 } 6108 6109 // GCC allows catching pointers and references to incomplete types 6110 // as an extension; so do we, but we warn by default. 6111 6112 QualType BaseType = ExDeclType; 6113 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 6114 unsigned DK = diag::err_catch_incomplete; 6115 bool IncompleteCatchIsInvalid = true; 6116 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 6117 BaseType = Ptr->getPointeeType(); 6118 Mode = 1; 6119 DK = diag::ext_catch_incomplete_ptr; 6120 IncompleteCatchIsInvalid = false; 6121 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 6122 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 6123 BaseType = Ref->getPointeeType(); 6124 Mode = 2; 6125 DK = diag::ext_catch_incomplete_ref; 6126 IncompleteCatchIsInvalid = false; 6127 } 6128 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 6129 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 6130 IncompleteCatchIsInvalid) 6131 Invalid = true; 6132 6133 if (!Invalid && !ExDeclType->isDependentType() && 6134 RequireNonAbstractType(Loc, ExDeclType, 6135 diag::err_abstract_type_in_decl, 6136 AbstractVariableType)) 6137 Invalid = true; 6138 6139 // Only the non-fragile NeXT runtime currently supports C++ catches 6140 // of ObjC types, and no runtime supports catching ObjC types by value. 6141 if (!Invalid && getLangOptions().ObjC1) { 6142 QualType T = ExDeclType; 6143 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 6144 T = RT->getPointeeType(); 6145 6146 if (T->isObjCObjectType()) { 6147 Diag(Loc, diag::err_objc_object_catch); 6148 Invalid = true; 6149 } else if (T->isObjCObjectPointerType()) { 6150 if (!getLangOptions().NeXTRuntime) { 6151 Diag(Loc, diag::err_objc_pointer_cxx_catch_gnu); 6152 Invalid = true; 6153 } else if (!getLangOptions().ObjCNonFragileABI) { 6154 Diag(Loc, diag::err_objc_pointer_cxx_catch_fragile); 6155 Invalid = true; 6156 } 6157 } 6158 } 6159 6160 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 6161 Name, ExDeclType, TInfo, SC_None, 6162 SC_None); 6163 ExDecl->setExceptionVariable(true); 6164 6165 if (!Invalid) { 6166 if (const RecordType *RecordTy = ExDeclType->getAs<RecordType>()) { 6167 // C++ [except.handle]p16: 6168 // The object declared in an exception-declaration or, if the 6169 // exception-declaration does not specify a name, a temporary (12.2) is 6170 // copy-initialized (8.5) from the exception object. [...] 6171 // The object is destroyed when the handler exits, after the destruction 6172 // of any automatic objects initialized within the handler. 6173 // 6174 // We just pretend to initialize the object with itself, then make sure 6175 // it can be destroyed later. 6176 InitializedEntity Entity = InitializedEntity::InitializeVariable(ExDecl); 6177 Expr *ExDeclRef = DeclRefExpr::Create(Context, 0, SourceRange(), ExDecl, 6178 Loc, ExDeclType, 0); 6179 InitializationKind Kind = InitializationKind::CreateCopy(Loc, 6180 SourceLocation()); 6181 InitializationSequence InitSeq(*this, Entity, Kind, &ExDeclRef, 1); 6182 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6183 MultiExprArg(*this, &ExDeclRef, 1)); 6184 if (Result.isInvalid()) 6185 Invalid = true; 6186 else 6187 FinalizeVarWithDestructor(ExDecl, RecordTy); 6188 } 6189 } 6190 6191 if (Invalid) 6192 ExDecl->setInvalidDecl(); 6193 6194 return ExDecl; 6195} 6196 6197/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 6198/// handler. 6199Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 6200 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6201 QualType ExDeclType = TInfo->getType(); 6202 6203 bool Invalid = D.isInvalidType(); 6204 IdentifierInfo *II = D.getIdentifier(); 6205 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 6206 LookupOrdinaryName, 6207 ForRedeclaration)) { 6208 // The scope should be freshly made just for us. There is just no way 6209 // it contains any previous declaration. 6210 assert(!S->isDeclScope(PrevDecl)); 6211 if (PrevDecl->isTemplateParameter()) { 6212 // Maybe we will complain about the shadowed template parameter. 6213 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6214 } 6215 } 6216 6217 if (D.getCXXScopeSpec().isSet() && !Invalid) { 6218 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 6219 << D.getCXXScopeSpec().getRange(); 6220 Invalid = true; 6221 } 6222 6223 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, TInfo, 6224 D.getIdentifier(), 6225 D.getIdentifierLoc(), 6226 D.getDeclSpec().getSourceRange()); 6227 6228 if (Invalid) 6229 ExDecl->setInvalidDecl(); 6230 6231 // Add the exception declaration into this scope. 6232 if (II) 6233 PushOnScopeChains(ExDecl, S); 6234 else 6235 CurContext->addDecl(ExDecl); 6236 6237 ProcessDeclAttributes(S, ExDecl, D); 6238 return ExDecl; 6239} 6240 6241Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 6242 Expr *AssertExpr, 6243 Expr *AssertMessageExpr_) { 6244 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 6245 6246 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 6247 llvm::APSInt Value(32); 6248 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 6249 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 6250 AssertExpr->getSourceRange(); 6251 return 0; 6252 } 6253 6254 if (Value == 0) { 6255 Diag(AssertLoc, diag::err_static_assert_failed) 6256 << AssertMessage->getString() << AssertExpr->getSourceRange(); 6257 } 6258 } 6259 6260 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 6261 AssertExpr, AssertMessage); 6262 6263 CurContext->addDecl(Decl); 6264 return Decl; 6265} 6266 6267/// \brief Perform semantic analysis of the given friend type declaration. 6268/// 6269/// \returns A friend declaration that. 6270FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 6271 TypeSourceInfo *TSInfo) { 6272 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 6273 6274 QualType T = TSInfo->getType(); 6275 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 6276 6277 if (!getLangOptions().CPlusPlus0x) { 6278 // C++03 [class.friend]p2: 6279 // An elaborated-type-specifier shall be used in a friend declaration 6280 // for a class.* 6281 // 6282 // * The class-key of the elaborated-type-specifier is required. 6283 if (!ActiveTemplateInstantiations.empty()) { 6284 // Do not complain about the form of friend template types during 6285 // template instantiation; we will already have complained when the 6286 // template was declared. 6287 } else if (!T->isElaboratedTypeSpecifier()) { 6288 // If we evaluated the type to a record type, suggest putting 6289 // a tag in front. 6290 if (const RecordType *RT = T->getAs<RecordType>()) { 6291 RecordDecl *RD = RT->getDecl(); 6292 6293 std::string InsertionText = std::string(" ") + RD->getKindName(); 6294 6295 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 6296 << (unsigned) RD->getTagKind() 6297 << T 6298 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 6299 InsertionText); 6300 } else { 6301 Diag(FriendLoc, diag::ext_nonclass_type_friend) 6302 << T 6303 << SourceRange(FriendLoc, TypeRange.getEnd()); 6304 } 6305 } else if (T->getAs<EnumType>()) { 6306 Diag(FriendLoc, diag::ext_enum_friend) 6307 << T 6308 << SourceRange(FriendLoc, TypeRange.getEnd()); 6309 } 6310 } 6311 6312 // C++0x [class.friend]p3: 6313 // If the type specifier in a friend declaration designates a (possibly 6314 // cv-qualified) class type, that class is declared as a friend; otherwise, 6315 // the friend declaration is ignored. 6316 6317 // FIXME: C++0x has some syntactic restrictions on friend type declarations 6318 // in [class.friend]p3 that we do not implement. 6319 6320 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 6321} 6322 6323/// Handle a friend type declaration. This works in tandem with 6324/// ActOnTag. 6325/// 6326/// Notes on friend class templates: 6327/// 6328/// We generally treat friend class declarations as if they were 6329/// declaring a class. So, for example, the elaborated type specifier 6330/// in a friend declaration is required to obey the restrictions of a 6331/// class-head (i.e. no typedefs in the scope chain), template 6332/// parameters are required to match up with simple template-ids, &c. 6333/// However, unlike when declaring a template specialization, it's 6334/// okay to refer to a template specialization without an empty 6335/// template parameter declaration, e.g. 6336/// friend class A<T>::B<unsigned>; 6337/// We permit this as a special case; if there are any template 6338/// parameters present at all, require proper matching, i.e. 6339/// template <> template <class T> friend class A<int>::B; 6340Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 6341 MultiTemplateParamsArg TempParams) { 6342 SourceLocation Loc = DS.getSourceRange().getBegin(); 6343 6344 assert(DS.isFriendSpecified()); 6345 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6346 6347 // Try to convert the decl specifier to a type. This works for 6348 // friend templates because ActOnTag never produces a ClassTemplateDecl 6349 // for a TUK_Friend. 6350 Declarator TheDeclarator(DS, Declarator::MemberContext); 6351 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 6352 QualType T = TSI->getType(); 6353 if (TheDeclarator.isInvalidType()) 6354 return 0; 6355 6356 // This is definitely an error in C++98. It's probably meant to 6357 // be forbidden in C++0x, too, but the specification is just 6358 // poorly written. 6359 // 6360 // The problem is with declarations like the following: 6361 // template <T> friend A<T>::foo; 6362 // where deciding whether a class C is a friend or not now hinges 6363 // on whether there exists an instantiation of A that causes 6364 // 'foo' to equal C. There are restrictions on class-heads 6365 // (which we declare (by fiat) elaborated friend declarations to 6366 // be) that makes this tractable. 6367 // 6368 // FIXME: handle "template <> friend class A<T>;", which 6369 // is possibly well-formed? Who even knows? 6370 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 6371 Diag(Loc, diag::err_tagless_friend_type_template) 6372 << DS.getSourceRange(); 6373 return 0; 6374 } 6375 6376 // C++98 [class.friend]p1: A friend of a class is a function 6377 // or class that is not a member of the class . . . 6378 // This is fixed in DR77, which just barely didn't make the C++03 6379 // deadline. It's also a very silly restriction that seriously 6380 // affects inner classes and which nobody else seems to implement; 6381 // thus we never diagnose it, not even in -pedantic. 6382 // 6383 // But note that we could warn about it: it's always useless to 6384 // friend one of your own members (it's not, however, worthless to 6385 // friend a member of an arbitrary specialization of your template). 6386 6387 Decl *D; 6388 if (unsigned NumTempParamLists = TempParams.size()) 6389 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 6390 NumTempParamLists, 6391 (TemplateParameterList**) TempParams.release(), 6392 TSI, 6393 DS.getFriendSpecLoc()); 6394 else 6395 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 6396 6397 if (!D) 6398 return 0; 6399 6400 D->setAccess(AS_public); 6401 CurContext->addDecl(D); 6402 6403 return D; 6404} 6405 6406Decl *Sema::ActOnFriendFunctionDecl(Scope *S, 6407 Declarator &D, 6408 bool IsDefinition, 6409 MultiTemplateParamsArg TemplateParams) { 6410 const DeclSpec &DS = D.getDeclSpec(); 6411 6412 assert(DS.isFriendSpecified()); 6413 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 6414 6415 SourceLocation Loc = D.getIdentifierLoc(); 6416 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6417 QualType T = TInfo->getType(); 6418 6419 // C++ [class.friend]p1 6420 // A friend of a class is a function or class.... 6421 // Note that this sees through typedefs, which is intended. 6422 // It *doesn't* see through dependent types, which is correct 6423 // according to [temp.arg.type]p3: 6424 // If a declaration acquires a function type through a 6425 // type dependent on a template-parameter and this causes 6426 // a declaration that does not use the syntactic form of a 6427 // function declarator to have a function type, the program 6428 // is ill-formed. 6429 if (!T->isFunctionType()) { 6430 Diag(Loc, diag::err_unexpected_friend); 6431 6432 // It might be worthwhile to try to recover by creating an 6433 // appropriate declaration. 6434 return 0; 6435 } 6436 6437 // C++ [namespace.memdef]p3 6438 // - If a friend declaration in a non-local class first declares a 6439 // class or function, the friend class or function is a member 6440 // of the innermost enclosing namespace. 6441 // - The name of the friend is not found by simple name lookup 6442 // until a matching declaration is provided in that namespace 6443 // scope (either before or after the class declaration granting 6444 // friendship). 6445 // - If a friend function is called, its name may be found by the 6446 // name lookup that considers functions from namespaces and 6447 // classes associated with the types of the function arguments. 6448 // - When looking for a prior declaration of a class or a function 6449 // declared as a friend, scopes outside the innermost enclosing 6450 // namespace scope are not considered. 6451 6452 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 6453 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 6454 DeclarationName Name = NameInfo.getName(); 6455 assert(Name); 6456 6457 // The context we found the declaration in, or in which we should 6458 // create the declaration. 6459 DeclContext *DC; 6460 6461 // FIXME: handle local classes 6462 6463 // Recover from invalid scope qualifiers as if they just weren't there. 6464 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 6465 ForRedeclaration); 6466 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 6467 DC = computeDeclContext(ScopeQual); 6468 6469 // FIXME: handle dependent contexts 6470 if (!DC) return 0; 6471 if (RequireCompleteDeclContext(ScopeQual, DC)) return 0; 6472 6473 LookupQualifiedName(Previous, DC); 6474 6475 // Ignore things found implicitly in the wrong scope. 6476 // TODO: better diagnostics for this case. Suggesting the right 6477 // qualified scope would be nice... 6478 LookupResult::Filter F = Previous.makeFilter(); 6479 while (F.hasNext()) { 6480 NamedDecl *D = F.next(); 6481 if (!DC->InEnclosingNamespaceSetOf( 6482 D->getDeclContext()->getRedeclContext())) 6483 F.erase(); 6484 } 6485 F.done(); 6486 6487 if (Previous.empty()) { 6488 D.setInvalidType(); 6489 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 6490 return 0; 6491 } 6492 6493 // C++ [class.friend]p1: A friend of a class is a function or 6494 // class that is not a member of the class . . . 6495 if (DC->Equals(CurContext)) 6496 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6497 6498 // Otherwise walk out to the nearest namespace scope looking for matches. 6499 } else { 6500 // TODO: handle local class contexts. 6501 6502 DC = CurContext; 6503 while (true) { 6504 // Skip class contexts. If someone can cite chapter and verse 6505 // for this behavior, that would be nice --- it's what GCC and 6506 // EDG do, and it seems like a reasonable intent, but the spec 6507 // really only says that checks for unqualified existing 6508 // declarations should stop at the nearest enclosing namespace, 6509 // not that they should only consider the nearest enclosing 6510 // namespace. 6511 while (DC->isRecord()) 6512 DC = DC->getParent(); 6513 6514 LookupQualifiedName(Previous, DC); 6515 6516 // TODO: decide what we think about using declarations. 6517 if (!Previous.empty()) 6518 break; 6519 6520 if (DC->isFileContext()) break; 6521 DC = DC->getParent(); 6522 } 6523 6524 // C++ [class.friend]p1: A friend of a class is a function or 6525 // class that is not a member of the class . . . 6526 // C++0x changes this for both friend types and functions. 6527 // Most C++ 98 compilers do seem to give an error here, so 6528 // we do, too. 6529 if (!Previous.empty() && DC->Equals(CurContext) 6530 && !getLangOptions().CPlusPlus0x) 6531 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 6532 } 6533 6534 if (DC->isFileContext()) { 6535 // This implies that it has to be an operator or function. 6536 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 6537 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 6538 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 6539 Diag(Loc, diag::err_introducing_special_friend) << 6540 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 6541 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 6542 return 0; 6543 } 6544 } 6545 6546 bool Redeclaration = false; 6547 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, TInfo, Previous, 6548 move(TemplateParams), 6549 IsDefinition, 6550 Redeclaration); 6551 if (!ND) return 0; 6552 6553 assert(ND->getDeclContext() == DC); 6554 assert(ND->getLexicalDeclContext() == CurContext); 6555 6556 // Add the function declaration to the appropriate lookup tables, 6557 // adjusting the redeclarations list as necessary. We don't 6558 // want to do this yet if the friending class is dependent. 6559 // 6560 // Also update the scope-based lookup if the target context's 6561 // lookup context is in lexical scope. 6562 if (!CurContext->isDependentContext()) { 6563 DC = DC->getRedeclContext(); 6564 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 6565 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6566 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 6567 } 6568 6569 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 6570 D.getIdentifierLoc(), ND, 6571 DS.getFriendSpecLoc()); 6572 FrD->setAccess(AS_public); 6573 CurContext->addDecl(FrD); 6574 6575 return ND; 6576} 6577 6578void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 6579 AdjustDeclIfTemplate(Dcl); 6580 6581 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 6582 if (!Fn) { 6583 Diag(DelLoc, diag::err_deleted_non_function); 6584 return; 6585 } 6586 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 6587 Diag(DelLoc, diag::err_deleted_decl_not_first); 6588 Diag(Prev->getLocation(), diag::note_previous_declaration); 6589 // If the declaration wasn't the first, we delete the function anyway for 6590 // recovery. 6591 } 6592 Fn->setDeleted(); 6593} 6594 6595static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 6596 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 6597 ++CI) { 6598 Stmt *SubStmt = *CI; 6599 if (!SubStmt) 6600 continue; 6601 if (isa<ReturnStmt>(SubStmt)) 6602 Self.Diag(SubStmt->getSourceRange().getBegin(), 6603 diag::err_return_in_constructor_handler); 6604 if (!isa<Expr>(SubStmt)) 6605 SearchForReturnInStmt(Self, SubStmt); 6606 } 6607} 6608 6609void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 6610 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 6611 CXXCatchStmt *Handler = TryBlock->getHandler(I); 6612 SearchForReturnInStmt(*this, Handler); 6613 } 6614} 6615 6616bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 6617 const CXXMethodDecl *Old) { 6618 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 6619 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 6620 6621 if (Context.hasSameType(NewTy, OldTy) || 6622 NewTy->isDependentType() || OldTy->isDependentType()) 6623 return false; 6624 6625 // Check if the return types are covariant 6626 QualType NewClassTy, OldClassTy; 6627 6628 /// Both types must be pointers or references to classes. 6629 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 6630 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 6631 NewClassTy = NewPT->getPointeeType(); 6632 OldClassTy = OldPT->getPointeeType(); 6633 } 6634 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 6635 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 6636 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 6637 NewClassTy = NewRT->getPointeeType(); 6638 OldClassTy = OldRT->getPointeeType(); 6639 } 6640 } 6641 } 6642 6643 // The return types aren't either both pointers or references to a class type. 6644 if (NewClassTy.isNull()) { 6645 Diag(New->getLocation(), 6646 diag::err_different_return_type_for_overriding_virtual_function) 6647 << New->getDeclName() << NewTy << OldTy; 6648 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6649 6650 return true; 6651 } 6652 6653 // C++ [class.virtual]p6: 6654 // If the return type of D::f differs from the return type of B::f, the 6655 // class type in the return type of D::f shall be complete at the point of 6656 // declaration of D::f or shall be the class type D. 6657 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 6658 if (!RT->isBeingDefined() && 6659 RequireCompleteType(New->getLocation(), NewClassTy, 6660 PDiag(diag::err_covariant_return_incomplete) 6661 << New->getDeclName())) 6662 return true; 6663 } 6664 6665 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 6666 // Check if the new class derives from the old class. 6667 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 6668 Diag(New->getLocation(), 6669 diag::err_covariant_return_not_derived) 6670 << New->getDeclName() << NewTy << OldTy; 6671 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6672 return true; 6673 } 6674 6675 // Check if we the conversion from derived to base is valid. 6676 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 6677 diag::err_covariant_return_inaccessible_base, 6678 diag::err_covariant_return_ambiguous_derived_to_base_conv, 6679 // FIXME: Should this point to the return type? 6680 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 6681 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6682 return true; 6683 } 6684 } 6685 6686 // The qualifiers of the return types must be the same. 6687 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 6688 Diag(New->getLocation(), 6689 diag::err_covariant_return_type_different_qualifications) 6690 << New->getDeclName() << NewTy << OldTy; 6691 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6692 return true; 6693 }; 6694 6695 6696 // The new class type must have the same or less qualifiers as the old type. 6697 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 6698 Diag(New->getLocation(), 6699 diag::err_covariant_return_type_class_type_more_qualified) 6700 << New->getDeclName() << NewTy << OldTy; 6701 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6702 return true; 6703 }; 6704 6705 return false; 6706} 6707 6708bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 6709 const CXXMethodDecl *Old) 6710{ 6711 if (Old->hasAttr<FinalAttr>()) { 6712 Diag(New->getLocation(), diag::err_final_function_overridden) 6713 << New->getDeclName(); 6714 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 6715 return true; 6716 } 6717 6718 return false; 6719} 6720 6721/// \brief Mark the given method pure. 6722/// 6723/// \param Method the method to be marked pure. 6724/// 6725/// \param InitRange the source range that covers the "0" initializer. 6726bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 6727 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 6728 Method->setPure(); 6729 6730 // A class is abstract if at least one function is pure virtual. 6731 Method->getParent()->setAbstract(true); 6732 return false; 6733 } 6734 6735 if (!Method->isInvalidDecl()) 6736 Diag(Method->getLocation(), diag::err_non_virtual_pure) 6737 << Method->getDeclName() << InitRange; 6738 return true; 6739} 6740 6741/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 6742/// an initializer for the out-of-line declaration 'Dcl'. The scope 6743/// is a fresh scope pushed for just this purpose. 6744/// 6745/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 6746/// static data member of class X, names should be looked up in the scope of 6747/// class X. 6748void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 6749 // If there is no declaration, there was an error parsing it. 6750 if (D == 0) return; 6751 6752 // We should only get called for declarations with scope specifiers, like: 6753 // int foo::bar; 6754 assert(D->isOutOfLine()); 6755 EnterDeclaratorContext(S, D->getDeclContext()); 6756} 6757 6758/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 6759/// initializer for the out-of-line declaration 'D'. 6760void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 6761 // If there is no declaration, there was an error parsing it. 6762 if (D == 0) return; 6763 6764 assert(D->isOutOfLine()); 6765 ExitDeclaratorContext(S); 6766} 6767 6768/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 6769/// C++ if/switch/while/for statement. 6770/// e.g: "if (int x = f()) {...}" 6771DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 6772 // C++ 6.4p2: 6773 // The declarator shall not specify a function or an array. 6774 // The type-specifier-seq shall not contain typedef and shall not declare a 6775 // new class or enumeration. 6776 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 6777 "Parser allowed 'typedef' as storage class of condition decl."); 6778 6779 TagDecl *OwnedTag = 0; 6780 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 6781 QualType Ty = TInfo->getType(); 6782 6783 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 6784 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 6785 // would be created and CXXConditionDeclExpr wants a VarDecl. 6786 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 6787 << D.getSourceRange(); 6788 return DeclResult(); 6789 } else if (OwnedTag && OwnedTag->isDefinition()) { 6790 // The type-specifier-seq shall not declare a new class or enumeration. 6791 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 6792 } 6793 6794 Decl *Dcl = ActOnDeclarator(S, D); 6795 if (!Dcl) 6796 return DeclResult(); 6797 6798 return Dcl; 6799} 6800 6801void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 6802 bool DefinitionRequired) { 6803 // Ignore any vtable uses in unevaluated operands or for classes that do 6804 // not have a vtable. 6805 if (!Class->isDynamicClass() || Class->isDependentContext() || 6806 CurContext->isDependentContext() || 6807 ExprEvalContexts.back().Context == Unevaluated) 6808 return; 6809 6810 // Try to insert this class into the map. 6811 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6812 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 6813 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 6814 if (!Pos.second) { 6815 // If we already had an entry, check to see if we are promoting this vtable 6816 // to required a definition. If so, we need to reappend to the VTableUses 6817 // list, since we may have already processed the first entry. 6818 if (DefinitionRequired && !Pos.first->second) { 6819 Pos.first->second = true; 6820 } else { 6821 // Otherwise, we can early exit. 6822 return; 6823 } 6824 } 6825 6826 // Local classes need to have their virtual members marked 6827 // immediately. For all other classes, we mark their virtual members 6828 // at the end of the translation unit. 6829 if (Class->isLocalClass()) 6830 MarkVirtualMembersReferenced(Loc, Class); 6831 else 6832 VTableUses.push_back(std::make_pair(Class, Loc)); 6833} 6834 6835bool Sema::DefineUsedVTables() { 6836 // If any dynamic classes have their key function defined within 6837 // this translation unit, then those vtables are considered "used" and must 6838 // be emitted. 6839 for (unsigned I = 0, N = DynamicClasses.size(); I != N; ++I) { 6840 if (const CXXMethodDecl *KeyFunction 6841 = Context.getKeyFunction(DynamicClasses[I])) { 6842 const FunctionDecl *Definition = 0; 6843 if (KeyFunction->hasBody(Definition)) 6844 MarkVTableUsed(Definition->getLocation(), DynamicClasses[I], true); 6845 } 6846 } 6847 6848 if (VTableUses.empty()) 6849 return false; 6850 6851 // Note: The VTableUses vector could grow as a result of marking 6852 // the members of a class as "used", so we check the size each 6853 // time through the loop and prefer indices (with are stable) to 6854 // iterators (which are not). 6855 for (unsigned I = 0; I != VTableUses.size(); ++I) { 6856 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 6857 if (!Class) 6858 continue; 6859 6860 SourceLocation Loc = VTableUses[I].second; 6861 6862 // If this class has a key function, but that key function is 6863 // defined in another translation unit, we don't need to emit the 6864 // vtable even though we're using it. 6865 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 6866 if (KeyFunction && !KeyFunction->hasBody()) { 6867 switch (KeyFunction->getTemplateSpecializationKind()) { 6868 case TSK_Undeclared: 6869 case TSK_ExplicitSpecialization: 6870 case TSK_ExplicitInstantiationDeclaration: 6871 // The key function is in another translation unit. 6872 continue; 6873 6874 case TSK_ExplicitInstantiationDefinition: 6875 case TSK_ImplicitInstantiation: 6876 // We will be instantiating the key function. 6877 break; 6878 } 6879 } else if (!KeyFunction) { 6880 // If we have a class with no key function that is the subject 6881 // of an explicit instantiation declaration, suppress the 6882 // vtable; it will live with the explicit instantiation 6883 // definition. 6884 bool IsExplicitInstantiationDeclaration 6885 = Class->getTemplateSpecializationKind() 6886 == TSK_ExplicitInstantiationDeclaration; 6887 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 6888 REnd = Class->redecls_end(); 6889 R != REnd; ++R) { 6890 TemplateSpecializationKind TSK 6891 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 6892 if (TSK == TSK_ExplicitInstantiationDeclaration) 6893 IsExplicitInstantiationDeclaration = true; 6894 else if (TSK == TSK_ExplicitInstantiationDefinition) { 6895 IsExplicitInstantiationDeclaration = false; 6896 break; 6897 } 6898 } 6899 6900 if (IsExplicitInstantiationDeclaration) 6901 continue; 6902 } 6903 6904 // Mark all of the virtual members of this class as referenced, so 6905 // that we can build a vtable. Then, tell the AST consumer that a 6906 // vtable for this class is required. 6907 MarkVirtualMembersReferenced(Loc, Class); 6908 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 6909 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 6910 6911 // Optionally warn if we're emitting a weak vtable. 6912 if (Class->getLinkage() == ExternalLinkage && 6913 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 6914 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 6915 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 6916 } 6917 } 6918 VTableUses.clear(); 6919 6920 return true; 6921} 6922 6923void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 6924 const CXXRecordDecl *RD) { 6925 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 6926 e = RD->method_end(); i != e; ++i) { 6927 CXXMethodDecl *MD = *i; 6928 6929 // C++ [basic.def.odr]p2: 6930 // [...] A virtual member function is used if it is not pure. [...] 6931 if (MD->isVirtual() && !MD->isPure()) 6932 MarkDeclarationReferenced(Loc, MD); 6933 } 6934 6935 // Only classes that have virtual bases need a VTT. 6936 if (RD->getNumVBases() == 0) 6937 return; 6938 6939 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 6940 e = RD->bases_end(); i != e; ++i) { 6941 const CXXRecordDecl *Base = 6942 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 6943 if (Base->getNumVBases() == 0) 6944 continue; 6945 MarkVirtualMembersReferenced(Loc, Base); 6946 } 6947} 6948 6949/// SetIvarInitializers - This routine builds initialization ASTs for the 6950/// Objective-C implementation whose ivars need be initialized. 6951void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 6952 if (!getLangOptions().CPlusPlus) 6953 return; 6954 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 6955 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 6956 CollectIvarsToConstructOrDestruct(OID, ivars); 6957 if (ivars.empty()) 6958 return; 6959 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 6960 for (unsigned i = 0; i < ivars.size(); i++) { 6961 FieldDecl *Field = ivars[i]; 6962 if (Field->isInvalidDecl()) 6963 continue; 6964 6965 CXXBaseOrMemberInitializer *Member; 6966 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 6967 InitializationKind InitKind = 6968 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 6969 6970 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 6971 ExprResult MemberInit = 6972 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 6973 MemberInit = MaybeCreateCXXExprWithTemporaries(MemberInit.get()); 6974 // Note, MemberInit could actually come back empty if no initialization 6975 // is required (e.g., because it would call a trivial default constructor) 6976 if (!MemberInit.get() || MemberInit.isInvalid()) 6977 continue; 6978 6979 Member = 6980 new (Context) CXXBaseOrMemberInitializer(Context, 6981 Field, SourceLocation(), 6982 SourceLocation(), 6983 MemberInit.takeAs<Expr>(), 6984 SourceLocation()); 6985 AllToInit.push_back(Member); 6986 6987 // Be sure that the destructor is accessible and is marked as referenced. 6988 if (const RecordType *RecordTy 6989 = Context.getBaseElementType(Field->getType()) 6990 ->getAs<RecordType>()) { 6991 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 6992 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 6993 MarkDeclarationReferenced(Field->getLocation(), Destructor); 6994 CheckDestructorAccess(Field->getLocation(), Destructor, 6995 PDiag(diag::err_access_dtor_ivar) 6996 << Context.getBaseElementType(Field->getType())); 6997 } 6998 } 6999 } 7000 ObjCImplementation->setIvarInitializers(Context, 7001 AllToInit.data(), AllToInit.size()); 7002 } 7003} 7004